Title of Invention: Steam generator, plant, and control method for steam generator
Technical field
[0001]
　TECHNICAL FIELD The present disclosure relates to a steam generator capable of generating steam to be supplied to a steam utilization device, a plant including the steam generator, and a control method for the steam generator.
Background technology
[0002]
　Steam generators are known for generating steam that is utilized in steam utilization equipment. For example, in a thermal power plant, power is generated by rotating a steam turbine using steam generated by a steam generator, which is a large boiler such as a coal-fired boiler, and driving a generator connected to the steam turbine. . In such a plant, when an increase in power demand is requested, the load of the steam generator (the amount of steam generated) is increased, thereby increasing the amount of power generation. When increasing the load on the steam generator, the amount of solid fuel (pulverized coal fuel). At this time, the coal is pulverized by a pulverizer (mill) to increase the amount of solid fuel (pulverized coal fuel) to be produced, and the primary air, which is carrier air, is used to carry the coal to the solid fuel burner.
[0003]
　Specifically, the power generation amount is increased according to the following procedure in response to the increase in power demand.
(a) Output a generator output request change command based on the power demand, set the main steam pressure set value based on the generator output request change command, acquire and compare the actual main steam pressure, Increase or decrease steam pressure.
(b) Output a load change command for the steam generator based on (a) above, and output an increase command to the control system such as the combustion amount (solid fuel supply amount) of the solid fuel burner, the water supply flow rate, the air flow rate, etc. .
(c) According to the above (b), the amount of coal fed to the mill and the flow rate of primary air serving as carrier air are increased to predetermined amounts, and the amount of solid fuel (pulverized coal fuel) supplied to the solid fuel burner is increased. Let
(d) Adjusting the feedwater flow rate of the steam generator and the heat transfer balance in each heat absorption part (furnace wall, superheater, reheater) to increase the main steam pressure at the steam generator outlet to a predetermined value.
[0004]
　By the above procedure, the combustion amount of the solid fuel burner is increased to a predetermined amount, and the load of the steam generator is increased to a predetermined value with a response time, completing the necessary increase of the main steam flow rate. As the flow rate of the main steam supplied to the steam turbine increases, the rotational force of the steam turbine increases, and the output of the generator rises to a predetermined value. Power can meet.
[0005]
　Here, solid fuel (pulverized coal fuel) is supplied to the solid fuel burner by pulverizing and classifying the coal supplied to the pulverizer (mill) to make pulverized coal of a predetermined size range, and the primary Since the fuel is conveyed to the solid fuel burner by air, a response time is required between the above (b) and the above (c), and a delay occurs in the load increase time of the steam generator.
[0006]
　Patent Literature 1 discloses a technique for supplementing the insufficient amount of combustion by operating a start-up burner other than the abnormally stopped solid fuel burner when some of the solid fuel burners are abnormally stopped. there is
prior art documents
patent literature
[0007]
Patent Document 1: Japanese Patent No. 4979535
SUMMARY OF THE INVENTION
Problems to be Solved by the Invention
[0008]
　However, the method of using the start-up burner described in Patent Literature 1 supplements the combustion amount of the stopped solid fuel burner, and is not assumed to be used when the load of the steam generator increases.
[0009]
　For example, a power system may have a coal-fired boiler power plant and a renewable energy power plant such as a photovoltaic power plant. In such a case, the power generation amount of renewable energy fluctuates according to the weather, so it is necessary to absorb the fluctuating amount with a coal-fired boiler power plant. For example, photovoltaic power generation produces power during the day but not at night, so a coal-fired boiler power plant must increase its load significantly when transitioning from day to night. Such an operation has not been assumed for a steam generator such as a coal-fired boiler, which has conventionally been operated with a substantially constant load or a gradual load change. In the operation of conventional steam generators, a load change rate of, for example, about 3 to 5%/min was assumed. is becoming
[0010]
　At least one embodiment of the present disclosure has been made in view of the above circumstances, and aims to provide a steam generator capable of coping with a high load change rate, a plant including the steam generator, and a control method for the steam generator. and
Means to solve problems
[0011]
　In order to solve the above problems, a steam generator according to some embodiments of the present disclosure is
　a steam generator capable of generating steam to be supplied to a steam utilization device,
　and comprises a furnace and a
　solid fuel. a plurality of burner units including solid fuel burners capable of forming flames in the furnace and ignition torches capable of forming ignition flames of the solid fuel burners and provided on a furnace wall defining the furnace
　; a control unit capable of controlling a plurality of burner units
,
　wherein the control unit ignites the ignition torch in at least some of the plurality of burner units when a load command value for the steam generator increases. do.
[0012]
　In order to solve the above problems, a plant according to some embodiments of the present disclosure includes the
　aforementioned steam generation device and the
　steam utilization device
.
[0013]
　In order to solve the above problems, a steam generator control method according to some embodiments of the present disclosure includes a
　furnace,
　a solid fuel burner capable of forming a flame in the furnace using a solid fuel, the solid fuel and a plurality of burner units provided on a furnace wall defining the furnace,
the control method for the
　steam generator comprising: When the load command value increases, the ignition torch is ignited in at least some of the plurality of burner units.
Effect of the invention
[0014]
　According to at least one embodiment of the present disclosure, it is possible to provide a steam generator capable of coping with a high load change rate, a plant including the steam generator, and a control method for the steam generator.
Brief description of the drawing
[0015]
1 is an overall configuration diagram of a plant according to some embodiments; FIG.
2 is a schematic diagram showing the configuration of a burner unit in the furnace of FIG. 1; FIG.
3 is a schematic diagram schematically showing a start-up burner fuel supply system and an ignition torch fuel supply system; FIG.
4 is a flow chart showing a control procedure of the burner unit when starting up the steam generator.
5 is a flow chart showing, for each process, the content of control by the control unit when the load is increased. FIG.
6 is a timing chart showing operating states of the ignition torch of each burner unit when the load command value increases. FIG.
7 is a flow chart showing, step by step, the details of control by the control unit when the starter burner is ignited in addition to the ignition torch when the load is increased. FIG.
8 is a timing chart showing operating states of an ignition torch and a start-up burner of each burner unit when the load command value increases. FIG.
9 is a schematic diagram showing the configuration of a burner unit in a furnace according to another embodiment; FIG.
MODE FOR CARRYING OUT THE INVENTION
[0016]
　Several embodiments of the present invention will now be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described as embodiments or shown in the drawings are not intended to limit the scope of the present invention, and are merely illustrative examples. do not have.
[0017]
　FIG. 1 is an overall configuration diagram of a plant 1 according to some embodiments. A plant 1 includes a steam generator 2 and a steam utilization device 4 . The steam generator 2 generates steam, and the steam utilization device 4 operates using the steam generated by the steam generator 2 . A plant 1 shown in the following embodiments is a power plant that includes a steam generator 2 that is a boiler and a steam utilization device 4 that is a steam turbine power generator.
[0018]
　The steam generator 2 is, for example, a coal-fired boiler that uses coal as a solid fuel (carbon-containing solid fuel). The steam generator 2 uses pulverized coal obtained by pulverizing coal as a pulverized fuel, recovers heat generated by burning the pulverized coal, and generates superheated steam by exchanging heat with water supply or steam.
[0019]
　The steam generator 2 comprises a furnace 6 , a combustion device 8 and a flue 10 . The furnace 6 is defined by a furnace wall of a predetermined shape, and is installed in the vertical direction, for example, in the form of a hollow rectangular cylinder. A furnace wall (heat transfer tube) that constitutes the furnace 6 includes a plurality of evaporating tubes and fins that connect them. By exchanging heat with the furnace wall, the temperature rise of the furnace wall is suppressed.
[0020]
　The combustion device 8 is provided below the furnace wall that constitutes the furnace 6 . The combustion device 8 of this embodiment includes a plurality of burner units 12 . Each burner unit 12 includes solid fuel burners 14 (pulverized coal combustion burners) capable of combusting solid fuel, as will be described later. . However, the shape of the furnace 6, the number of burner units 12, and the number of stages are not limited.
[0021]
　A solid fuel burner 14 of the burner unit 12 is connected to a pulverizer 18 (mill) through a solid fuel supply pipe 16 . Although the configuration of the crusher 18 is omitted in FIG. 1, the crusher 18 has, for example, a rotary table rotatably supported in a housing, and a plurality of rollers above the rotary table to rotate the rotary table. is rotatably supported in conjunction with the When coal is fed between a plurality of rollers and a rotary table, it is pulverized and carbonized, transported together with transport air (primary air), and classified into a predetermined size range by a classifier (not shown). The classified pulverized coal is supplied to solid fuel burner 14 through solid fuel supply pipe 16 .
[0022]
　The furnace 6 is provided with wind boxes 20 provided at the mounting positions of the plurality of burner units 12 . One end of an air duct (not shown) is connected to the air box 20, and an air blower (not shown) is provided at the other end of the air duct.
[0023]
　The flue 10 is connected to the upper part of the furnace 6 in the vertical direction. The flue 10 includes a primary superheater 22, a secondary superheater 24, a tertiary superheater 26, a primary reheater 28, a secondary reheater 29, and a node as heat exchangers for recovering the heat of the combustion gas. A charcoal generator 30 is provided, and heat is exchanged between combustion gas generated by combustion in the furnace 6 and water or steam flowing through each heat exchanger to generate steam.
[0024]
　The steam utilization device 4 supplied with steam from the flue 10 includes a high-pressure turbine 32, a middle-low pressure turbine 34 coaxially connected to the high-pressure turbine 32, and a middle-low pressure turbine 34 coaxially connected. A steam turbine power plant comprising a generator 36 . Note that the high-pressure turbine 32, the intermediate- and low-pressure turbine 34, and the generator 36 may not be coaxially connected. For example, they may be configured as separate shafts via gears.
[0025]
　A main steam pipe 40 having a main steam valve 38 is connected to the upstream side of the high pressure turbine 32 . A tertiary superheater 26 is connected to the upstream side of the main steam pipe 40 to which the steam generated by the steam generator 2 is supplied. The downstream side of the high pressure turbine 32 is connected to the upstream side of the primary reheater 28 via a high pressure turbine discharge pipe 42 . The steam that has passed through the primary reheater 28 is supplied to the secondary reheater 29 connected downstream.
[0026]
　A reheat steam pipe 46 having a reheat steam valve 44 is connected to the upstream side of the middle and low pressure turbine 34 . The upstream side of the reheat steam pipe 46 is connected to the downstream side of the secondary reheater 29 . A condenser 50 is connected to the downstream side of the intermediate/low pressure turbine 34 via an intermediate/low pressure turbine discharge pipe 48 . The steam led to the condenser 50 is cooled and condensed by cooling water such as seawater to become condensed water.
[0027]
　The generator 36 generates power by being rotationally driven by the high-pressure turbine 32 and the intermediate/low-pressure turbine 34 . Electric power generated by the generator 36 is sent to the system via wiring (not shown).
[0028]
　A water supply pipe 52 is connected to the downstream side of the condenser 50 . The downstream side of the water supply pipe 52 is connected to the economizer 30 . A water supply pump 54 is provided in the middle of the water supply pipe 52 , and condensate is supplied to the economizer 30 by the water supply pump 54 .
[0029]
　The feedwater pump 54 is rotationally driven by a feedwater pump driving steam turbine 56 . The steam turbine 56 for driving the feedwater pump receives high-pressure steam from the high-pressure turbine 32 via a high-pressure steam extraction pipe 58 and medium-low pressure steam from the medium-low pressure turbine 34 via a medium-low pressure steam extraction pipe 60 . The high-pressure steam extraction pipe 58 is provided with a high-pressure steam extraction valve 62 , and the medium-low pressure steam extraction pipe 60 is provided with a medium-low pressure steam extraction valve 64 . By controlling the opening degrees of the high-pressure steam extraction valve 62 and the medium-low pressure steam extraction valve 64, the amount of extracted air from the high-pressure turbine 32 and the medium-low pressure turbine 34 can be adjusted.
[0030]
　A furnace wall pipe 68 is provided between the economizer 30 and the steam separator 66 . The furnace wall tubes 68 are configured as a plurality of heat transfer tubes surrounding the furnace 6 . When the feedwater passes through the furnace wall tube 68 via the economizer 30, it receives radiation from the flames in the furnace 6 and is heated. Feedwater heated by passing through furnace wall tube 68 is directed to steam separator 66 .
[0031]
　The steam separated by the steam separator 66 is supplied to the primary superheater 22 , and the drain water separated by the steam separator 66 is led to the water supply pipe 52 via the drain water pipe 65 . The drain water pipe 65 is provided with a recirculation pump 67 for recirculating the drain water by leading it to the water supply pipe 52 .
[0032]
　A turbine bypass pipe 69 is provided in the main steam pipe 40 so as to branch from the upstream side of the main steam valve 38 . A downstream side of the turbine bypass pipe 69 is connected to the condenser 50 . A turbine bypass valve 63 is provided in the turbine bypass pipe 69 . By controlling the opening and closing of the turbine bypass valve 63 , a part of the main steam can bypass the high pressure turbine 32 and the intermediate/low pressure turbine 34 via the turbine bypass pipe 69 .
[0033]
　The control unit 70 is a control unit for controlling the plurality of burner units 12, and includes, for example, a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), a computer-readable storage medium, and the like. consists of A series of processes for realizing various functions is stored in a storage medium in the form of a program, for example, and the CPU reads out the program to a RAM or the like, and executes information processing and arithmetic processing. Various functions are realized by
[0034]
　The program is pre-installed in a ROM or other storage medium, provided in a state stored in a computer-readable storage medium, distributed via wired or wireless communication means, etc. may apply. Computer-readable storage media include, for example, magnetic disks, magneto-optical disks, CD-ROMs, DVD-ROMs, and memories such as semiconductors.
[0035]
　FIG. 2 is a schematic diagram showing the configuration of the burner unit 12 in the furnace 6 of FIG. FIG. 2 transparently shows from a perspective direction how a plurality of burner units 12 are provided on the furnace wall constituting the furnace 6 . Each burner unit 12 includes a solid fuel burner 14 , a starting burner 15 and an ignition torch 17 . As described above, the solid fuel burner 14 is configured to burn the solid fuel (mixed with primary air) supplied through the solid fuel supply pipe 16 to form a flame within the furnace 6 .
[0036]
　The start-up burner 15 burns fuel to form a flame inside the furnace 6 when the steam generator 2 is started, thereby increasing the temperature inside the furnace 6 . The fuel burned by the start-up burner 15 has better ignitability than the solid fuel used by the solid fuel burner 14. For example, it may be gas fuel such as methane gas, or light oil or heavy oil. It may be oil fuel.
[0037]
　The ignition torch 17 is configured to be capable of forming an ignition flame for the solid fuel burner 14 by burning fuel. The fuel burned by the ignition torch is, like the starting fuel, a fuel that has better ignitability than the solid fuel used in the solid fuel burner 14. For example, it may be a gas fuel such as methane gas, or light oil. or oil fuel such as heavy oil.
[0038]
　In the embodiment shown in FIG. 2, in each burner unit 12, the solid fuel burner 14 and the starting burner 15 are arranged concentrically so that their central axes are aligned (more specifically, the starting burner 15 is The solid fuel burner 14 is provided outside so as to surround it from the outside). Further, the ignition torch 17 is arranged adjacent to the solid fuel burner 14 and the starting burner 15 which are concentrically arranged so that the solid fuel burner 14 and the starting burner 15 are fired by the ignition flame formed by the ignition torch 17 . 15 is configured to be ignitable.
[0039]
　In the burner unit 12 having such a configuration, a plurality of burner sets BS1, BS2, BS3, . are arranged over a plurality of stages along the In each burner set BS1, BS2, BS3, . . . , four burner units 12 are arranged so as to face each other on a pair of surfaces 6a, 6b of the furnace wall that constitutes the furnace 6. (ie each burner set includes eight burner units 12 arranged at the same height).
　In the following description, the eight burner units 12 at the same height are treated as one burner set as described above. , may be treated as independent burner sets.
[0040]
　A common fuel is supplied to the starting burner 15 and the ignition torch 17 of each burner unit 12 via a starting burner fuel supply system 72a and an ignition torch fuel supply system 72b, respectively. FIG. 3 is a schematic diagram schematically showing the starting burner fuel supply system 72a and the ignition torch fuel supply system 72b. 3 representatively shows the starting burner fuel supply system 72a and the ignition torch fuel supply system 72b for the starting burner 15 and the ignition torch 17 of the single burner unit 12. A fuel supply system for the starter burner 15 and the ignition torch 17 is the same.
[0041]
　The starting burner fuel supply system 72a and the ignition torch fuel supply system 72b have a common fuel tank 74 in which fuel is stored. The start-up burner fuel supply system 72a has a fuel supply main pipe 76 connecting between the fuel tank 74 and the start-up burner 15. The fuel supply main pipe 76 has a pump 82, a pressure A meter 84, flow meter 86, flow control valve 88, isolation valve 90 and start-up burner valve 92 are provided. A leak check pipe 94 having a leak check valve 93 is provided in the fuel supply main pipe 76 so as to bypass the cutoff valve 90 .
[0042]
　A pressure adjustment line 96 is provided between the pump 82 and the pressure gauge 84 in the main fuel supply pipe 76 . The downstream side of the pressure regulation line 96 is connected to the fuel tank 74 . A pressure regulating valve 98 is provided in the pressure regulating line 96 . The opening of the pressure regulating valve 98 is controlled based on the measured value of the pressure gauge 84 .
[0043]
　The opening degree of the flow control valve 88 is controlled based on the measured value of the flow meter 86 . In addition, a return pipe 100 that branches from between the cutoff valve 90 and the start-up burner valve 92 in the main fuel supply pipe 76 and is connected to the pressure adjustment line 96 is provided. A circulation valve 102 is provided in the return pipe 100 . The opening degree of the circulation valve 102 is controlled by the controller 70 .
[0044]
　The ignition torch fuel supply system 72b has a main fuel supply pipe 103 connecting between the fuel tank 74 and the ignition torch 17. The main fuel supply pipe 103 has a pump 104 and a pressure gauge 106 in order from the fuel tank 74 side. , a flow meter 108, a flow control valve 110, an ignition torch isolation valve 113 and an ignition torch valve 112 are provided.
[0045]
　A pressure adjustment line 114 is provided between the pump 104 and the pressure gauge 106 in the main fuel supply pipe 103 . The downstream side of pressure regulation line 114 is connected to fuel tank 74 . A pressure regulating valve 116 is provided in the pressure regulating line 114 . The opening of the pressure regulating valve 116 is controlled based on the measured value of the pressure gauge 106 .
[0046]
　The opening degree of the flow control valve 110 is controlled based on the measurement value of the flow meter 108 . Further, a return pipe 118 branched from between the flow control valve 110 and the ignition torch valve 112 in the fuel supply main pipe 103 and connected to the pressure control line 114 is provided. A circulation valve 120 is provided in the return pipe 118 . The opening degree of circulation valve 120 is controlled by control unit 70 .
[0047]
　The burner unit 12 of the steam generator 2 having the above configuration is controlled as follows.
[0048]

　FIG. 4 is a flow chart showing the control procedure of the burner unit 12 when the steam generator 2 is started.
　At the initial start-up when the burner unit 12 is stopped, the control unit 70 first prepares the start-up burner 15 for operation (step S100). Specifically, the pump 82 is started in the starting burner fuel supply system 72 a and the pressure is controlled by the pressure regulating valve 98 . Subsequently, the flow control valve 88 and the leak check valve 93 are opened, and when the predetermined pressure is reached, the leak check valve 93 is closed. After a predetermined time has passed, it is confirmed that the pressure change is within a predetermined range, and the leak check (confirmation of the presence or absence of oil leakage) is completed. At this time, the shutoff valve 90 is closed, but after confirming that there is no oil leakage through a leak check, the shutoff valve 90 is opened to increase the pressure in the starting burner fuel supply system 72a. The pressure in the start-up burner fuel supply system 72a is increased until the pressure reaches a predetermined pressure at which the start-up burner 15 can be ignited, and the start-up burner 15 is ready for operation.
[0049]
　If the ignition torch fuel supply system 72b is provided with a leak check valve or the like like the startup burner fuel supply system 72a, then the ignition torch 17 is operated in the same manner as the operation preparation of the startup burner 15 in step S100. You may make it prepare for operation. Such preparation for operation of the ignition torch 17 may be performed before preparation for operation of the start-up burner 15, may be performed after preparation for operation of the start-up burner 15, or may be performed together with preparation for operation of the start-up burner 15. You can go at the same time.
[0050]
　When the start-up burner 15 is ready for operation, the control unit 70 ignites the ignition torch 17 to ignite the start-up burner 15 (step S101), and then opens the start-up burner valve 92. , the starting burner 15 is ignited (step S102). When the ignition of the starting burner is confirmed (step S103: YES), the control unit 70 extinguishes the ignition torch ignited in step S101 (step S104). When the ignition of the starting burner 15 is completed in this way and the temperature in the furnace 6 is increased by the starting burner 15 to exceed the threshold value (step S105: YES), the control unit 70 controls the solid fuel burner to be ignited. The ignition torch 17 corresponding to 14 is ignited (step S106). The solid fuel burner 14 to be ignited at startup is designated in advance, and the control unit 70 ignites the ignition torch 17 by sending an ignition instruction to the ignition torch 17 corresponding to the solid fuel burner 14 (at this time Since the starter burner 15 was ignited in step S102, both the starter burner 15 and the ignition torch 17 are in an ignited state (co-firing state). Then, the control unit 70 supplies the solid fuel to the solid fuel burner 14, so that the solid fuel burner 14 is ignited by the ignition flame formed by the ignition torch 17 (step S107). Subsequently, when the control unit 70 confirms that the solid fuel burner 14 has ignited (step S108: YES), it extinguishes the ignition torch 17 (step S109) and extinguishes the starting burner 15 (step S110). At the start-up time, the solid-fuel burner 14 is ignited by controlling the solid-fuel burner 14 , the start-up burner 15 and the ignition torch 17 in the predetermined burner unit 12 .
[0051]

　The steam generator 2 after starting shifts to steady operation. In steady operation, the output of the steam generator 2 is controlled by the controller 70 igniting the solid fuel burner 14 of each burner unit 12 according to the load command value for the steam generator 2 . At this time, the coal is pulverized in the pulverizer 18 to produce pulverized coal, which is a solid fuel. The solid fuel passes through a solid fuel supply pipe 16 together with primary air, which is carrier air, and is supplied to the solid fuel burner 14 . Secondary air heated by exchanging heat with the exhaust gas discharged from the steam generator 2 is supplied to each solid fuel burner 14 via the wind box 20 . Thereby, the solid fuel burner 14 blows a mixture of solid fuel and primary air into the furnace 6 and blows secondary air into the furnace 6 to form a flame. The flame thus formed is generated in the lower part of the furnace 6 and the combustion gases rise inside the furnace 6 and are discharged into the flue 10 .
[0052]
　The combustion gas is subjected to heat exchange in the superheaters 22, 24, 26, the reheaters 28, 29, and the economizer 30 arranged in the flue 10, and then discharged to the outside after predetermined exhaust gas treatment. be done.
[0053]
　The steam superheated by the superheaters 22 , 24 , 26 by exchanging heat with the combustion gas is led to the high pressure turbine 32 via the main steam pipe 40 to drive the high pressure turbine 32 . Steam that has done work in high pressure turbine 32 is directed to primary reheater 28 via high pressure turbine discharge line 42 . The steam guided to the primary reheater 28 is reheated by the combustion gas to become reheated steam, which is then guided to the medium and low pressure turbine 34 via the reheated steam pipe 46 . The medium and low pressure turbine 34 is driven by the reheat steam. Rotational driving force obtained by the high-pressure turbine 32 and the medium-low pressure turbine 34 is transmitted to the generator 36 to generate power.
[0054]
　The steam that has finished work in the medium and low pressure turbine 34 is led to the condenser 50 via the medium and low pressure turbine discharge pipe 48 to be condensed. The condensate in the condenser 50 is led to the economizer 30 by the water supply pump 54 and heated. After that, the feed water led from the economizer 30 passes through the furnace wall tube 68 to be heated and led to the steam separator 66 . The steam separated by the steam separator 66 is sequentially sent to each superheater 22, 24, 26 and superheated by the combustion gas.
[0055]
　In steady operation, the amount of power generated by the generator 36 is controlled so as to correspond to the power demand for the plant 1 . Fluctuations in power demand in steady operation are relatively mild, and when power demand increases, for example, the power generation amount is increased according to the following procedure.
(a) Output an output request change command to the generator 36 based on the power demand, set the main steam pressure set value based on the command, acquire and compare the actual main steam pressure, Increase or decrease steam pressure.
(b) Output a load change command for the steam generator 2 based on the above (a), and output an increase command to the control system such as the combustion amount (fuel supply amount) of the solid fuel burner 14, the water supply flow rate, the air flow rate, etc. do.
(c) According to (b) above, the amount of solid fuel supplied to the solid fuel burner 14 is increased by increasing the amount of coal supplied to the pulverizer 18 and the primary air flow rate to predetermined values.
(d) Adjusting the feed water flow rate in the steam generator 2 and the heat transfer balance in each heat absorption part (furnace wall tube 68, superheaters 22, 24, 26, each reheater 28, 29), The pressure is increased to a predetermined value set by the output demand command of the generator 36.
[0056]

　For example, when a renewable energy power generation plant (not shown) such as a photovoltaic power generation system connected to the power system that is the output destination of the generator 36 stops, the power demand for the plant 1 is It can increase significantly beyond the operating range. In such a case, the control section 70 controls the burner unit 12 as follows.
[0057]
　FIG. 5 is a flow chart showing the details of the control by the control section 70 when the load is increased step by step, and FIG. 6 is a timing chart showing the operating state of the ignition torch of each burner unit when the load command value is increased. Here, as the power demand for the plant 1 increases, the load command value for the steam generator 2 changes from the low load state corresponding to the first load command value L1 to the second load command value L2 ( >L1) will be described as an example.
[0058]
　First, the control unit 70 acquires the load command value for the steam generator 2 (step S200), and determines whether or not the load command value has increased (step S201). The determination in step S201 is made, for example, by calculating the rate of increase (amount of change in a predetermined period of time) for the load command value acquired in step S200 and determining whether the rate of increase exceeds a reference value. Accordingly, in step S201, it is determined whether or not the load command value has increased beyond the range of steady operation. Such a reference value is set, for example, as a rate of increase so large that it is difficult to follow the increasing load command value only by control during steady-state operation. is set to
[0059]
　When it is determined that the load command value has increased (step S201: YES), the control section 70 ignites the ignition torches 17 in at least some of the plurality of burner units 12 (step S202). At the time of start-up and steady operation described above, the ignition torch 17 was used to form an ignition flame when the solid fuel burner 14 was ignited. is ignited. When the load command value increases greatly, the output of the steam generator 2 is delayed only by the above-described control of (a) to (c) during steady operation. By increasing the amount of heat input from the burner unit 12 to the furnace 6, it is possible to improve the followability of the output of the steam generator 2 with respect to the load command value that greatly increases.
[0060]
　In addition, the ignition torch 17 can ignite more quickly than the starter burner 15, which requires a preparatory operation such as a leak check at the time of ignition (the starter burner 15 performs a preparatory operation such as step S100 in FIG. 4). is required, so it takes a relatively long time to ignite). In other words, since the ignition torch 17 requires simpler preparation operations for ignition than the starter burner 15, when the load command value increases, quick ignition operation is performed to obtain good responsiveness.
[0061]
　In step S202 , the control section 70 may ignite the ignition torches 17 in all the burner units 12 . 6, each ignition torch 17 in all burner sets BS1, BS2, BS3, . . . BS6 is ignited at time t1 when the load command value starts increasing from the first load state L1. As a result, the amount of heat input to the furnace 6 by the ignition torch 17 of each burner unit 12 can be quickly maximized, and the responsiveness to the load command value can be further improved.
[0062]
　In step S202 , the control section 70 may ignite the ignition torches 17 in some of the plurality of burner units 12 . That is, although FIG. 6 illustrates the case where the ignition torches 17 of all the burner units 12 are ignited, the ignition torches 17 of some of the burner units 12 may be ignited. By adjusting the number of ignition torches 17 that ignite in this way, the amount of heat input to the furnace 6 is optimized, the heat input is prevented from becoming excessive, the surroundings are protected, and good responsiveness to load changes is achieved. can be obtained.
[0063]
　In step S202, when the ignition torches 17 in a plurality of burner units 12 are to be ignited, the ignition torches 17 may be ignited at the same time. In the example of FIG. 6, the ignition torches 17 of all burner sets BS1, BS2, BS3, . As a result, the heat input to the furnace 6 by the plurality of ignition torches 17 is rapidly performed, thereby obtaining good responsiveness.
[0064]
　Subsequently, the control unit 70 determines whether or not the load command value has finished changing (step S203). In FIG. 6, the change in the load command value ends when the load command value increased from the first load command value L1 reaches the second load command value L2. Until the load command value reaches the second load command value L2 from the first load command value L1, the solid fuel burner 14 in each burner unit 12 is ignited as necessary as the load command value increases. To go. During this time, the ignition torch 17 ignited in step S202 is maintained in the ignited state, thereby contributing to an increase in the output of the steam generator 2 .
[0065]
　When the change of the load command value is finished (step S203: YES), the control unit 70 controls the ignition torch 17 that has been ignited in step S202 to be extinguished (step S204). As a result, after the load command value is stabilized, the ignition torch 17 is returned to the extinguished state, thereby suppressing fuel consumption in the ignition torch 17 and returning to steady operation.
[0066]
　In step S204, the controller 70 may extinguish the plurality of ignition torches 17 that have been ignited at different timings. In the example of FIG. 6, the ignition torches 17 in the burner sets BS1, BS2, BS3, . If a plurality of ignition torches 17 were extinguished at the same time, the amount of heat input to the furnace 6 would change significantly, which could make the combustion state unstable. Therefore, by varying the extinguishing timings of the plurality of ignition torches 17, it is possible to effectively prevent the combustion state from becoming unstable.
[0067]
　Further, the extinguishing control of the ignition torch 17 in step S204 may be performed at the timing when a predetermined time has passed since the ignition operation of the ignition torch 17 in step S202. In this case, the ignition torch 17 is ignited in a limited manner at the initial stage of change in the load command value, thereby temporarily contributing to an increase in the output of the steam generator 2 and improving followability to the load command value. After the predetermined time has passed, the ignition torch 17 is quickly extinguished, so that the amount of fuel consumed by the ignition torch 17 can be suppressed.
[0068]
　In step S202 , the control section 70 may ignite the start-up burners 15 in at least some of the plurality of burner units 12 . When the load command value increases in this manner, the heat input to the furnace 6 is further increased by igniting the starting burner 15 in addition to the ignition torch 17 . As a result, even when the load change rate of the steam generator 2 is large, the load of the steam generator 2 can follow the load change with good responsiveness.
[0069]
　Here, FIG. 7 is a flow chart showing the details of control by the control unit 70 when the starting burner 15 is ignited in addition to the ignition torch 17 when the load increases, and FIG. 4 is a timing chart showing operating states of an ignition torch 17 and a starter burner 15 of the burner unit.
[0070]
　First, similarly to steps S200 and S201 described above, the control unit 70 acquires the load command value for the steam generator 2 (step S300), and determines whether or not the load command value has increased (step S301). If it is determined that the load command value has increased (step S301: YES), the controller 70 ignites the ignition torches 17 in at least some of the plurality of burner units 12 (step S301: YES), as in step S202 described above. S302). By igniting the ignition torch 17 in this way, the amount of heat input from the burner unit 12 to the furnace 6 is increased, thereby improving the followability of the output of the steam generator 2 with respect to the load command value that greatly increases. can be done.
[0071]
　Subsequently, the controller 70 ignites the starting burner 15 (step S303). As a result, the starting burner 15 is also ignited in addition to the ignition torch 17 ignited in step S302, thereby further improving the output of the steam generator 2 and increasing the load command value. output followability is obtained.
[0072]
　Subsequently, similarly to step S203, the control unit 70 determines whether or not the load command value has finished changing (step S304). controls the starting burner 15 ignited in step 303 to extinguished state (step S305), and then controls the ignition torch 17 ignited in step S202 to extinguish state (step S306). As a result, after the load command value is stabilized, the starting burner 15 and the ignition torch 17 are returned to the extinguished state, thereby suppressing the fuel consumption in the starting burner 15 and the ignition torch 17 and returning to steady operation. Become.
[0073]
　When controlling the start-up burner 15 and the ignition torch 17 to be extinguished in steps S305 and S306, the start-up burner 15 and the ignition torch 17 may be controlled to be extinguished at different timings. . The example of FIG. 8 shows that the extinguishing timing differs for each of the starting burner 15 and the ignition torch 17 that have been ignited. As a result, it is possible to effectively prevent the combustion state from becoming unstable due to a large change in the amount of heat input to the furnace 6 during fire extinguishing control.
[0074]
　When the starting burner 15 is ignited in step S303, the control unit 70 may ignite the starting burner 15 of the burner unit 12 to which the solid fuel burner 14 in the ignited state belongs. In the burner unit 12 in which the solid fuel burner 14 is in an ignited state, the starting burner 15 can be easily ignited because the area around the ignited solid fuel burner 14 is at a high temperature. As a result, the time from the ignition operation of the start-up burner 15 to the completion of ignition can be shortened, and quicker response control becomes possible.
[0075]
　Further, when the starting burner 15 is ignited in step S303, the control unit 70 may ignite the starting burner 15 of the burner unit 12 to which the unignited solid fuel burner 14 belongs. If both the solid fuel burner 14 and the start-up burner 15 are ignited in a specific burner unit 12, the heat input to the furnace wall in the vicinity of the burner unit 12 becomes excessive, which may damage the furnace wall. . Therefore, by igniting the start-up burner 15 in the burner unit 12 in which the solid fuel burner 14 is in an unignited state, it is possible to improve followability to load changes while protecting the furnace wall.
[0076]
　When the ignition torch 17 and the start-up burner 15 are ignited in steps S302 and S303, after the ignition torch 17 is ignited, the control unit 70 controls the start-up burner 15 included in the burner unit 12 to which the ignition torch 17 belongs. may be ignited. When the load command value increases, the ignition torch 17 is first ignited, so that a pilot light can be generated for the subsequent ignition operation of the start-up burner 15 . As a result, smooth ignition operation of the start-up burner 15 becomes possible, and quicker response control becomes possible.
[0077]
　When the ignition torch 17 and the starter burner 15 are to be ignited in steps S302 and S303, the control unit 70 controls that at least the lowest solid fuel burner 14 among the plurality of burner sets provided along the vertical direction has not yet been activated. After igniting the ignition torch 17 of the burner unit 12 included in the burner set in the ignited state (for example, in the embodiment shown in FIG. 2, the lowest burner set BS1), the ignition torch 17 included in the burner unit 12 to which the ignition torch 17 belongs. The starting burner 15 may be ignited. When a plurality of burner units 12 are arranged in the vertical direction, even if the solid fuel burner 15 on the upper side is not ignited, if the solid fuel burner 14 on the lower side has been ignited, the solid fuel burner 14 Since the pilot flame of the starting burner 15 can be ensured by the flame rise of , there is no problem in ignitability. On the other hand, when the solid fuel burner 14 on the lower side is not ignited, there is no pilot light for the starting burner 15 belonging to the same burner unit 12 as the solid fuel burner 14, so the starting burner 15 is difficult to ignite. There is In this embodiment, in the burner unit 12 in which at least the lowermost solid fuel burner 14 is in an unignited state, the ignition torch 17 is ignited prior to the start burner 15, thereby forming a pilot light for the start burner 15. and can improve ignitability.
[0078]
　Next, a steam generator 2 having a burner unit 12 having a configuration different from that of the above embodiment will be described as an example. FIG. 9 is a schematic diagram showing the configuration of a burner unit 12 in a furnace 6 according to another embodiment. The embodiment shown in FIG. 9 is a modified example of FIG. 2, and unless otherwise stated, the same reference numerals are given to the configurations corresponding to the above-described embodiments, and overlapping explanations will be omitted as appropriate.
[0079]
　The burner unit 12 shown in FIG. 9 includes a solid fuel burner 14 capable of forming a flame in the furnace 6 by burning solid fuel, and a starter burner 14 capable of raising the temperature inside the furnace 6 by burning fuel at startup. 15, and an ignition torch 17 including a first ignition torch 17a and a second ignition torch 17b capable of forming ignition flames for the solid fuel burner 14 and the starting burner 15, respectively. In each burner unit 12, a pair of solid fuel burners 14 are provided on both sides of the starting burner 15 in the vertical direction (both sides in the vertical direction). The first ignition torch 17a is arranged adjacent to the solid fuel burner 14, and is configured to be capable of forming an ignition flame for the solid fuel burner 14, as in the above-described embodiment. The second ignition torch 17b is arranged adjacent to the start-up burner 15 and configured to form an ignition flame for the start-up burner 15 .
[0080]
　The second ignition torch 17b has substantially the same configuration as the first ignition torch 17a (the ignition torch 17 of the above-described embodiment), and is temporarily ignited when the starting burner 15 is ignited, Forms the ignition flame for the starter burner. Fuel is supplied to the first ignition torch 17a and the second ignition torch 17b through a common ignition torch fuel supply system 72b. 70 can be controlled independently of each other.
[0081]
　A group of burner units 12 having such a configuration are arranged at the same height of the furnace 6 along the vertical direction as burner sets BS1, BS2, BS3, . placed. In each burner set BS1, BS2, BS3, . placed. In FIG. 7, the burner unit 12 arranged at the corner 7b located on the frontmost side is omitted in order to make the illustration easier to see.
[0082]
　The steam generator 2 having the above configuration is controlled according to the flowchart shown in FIG. (See step S202 in FIG. 5), the output of the steam generator 2 can follow the variation of the load command value satisfactorily. In step S202, the controller 70 ignites at least one of the first ignition torch 17a and the second ignition torch 17b. Accordingly, by increasing the amount of heat input from the burner unit 12 to the furnace 6, it is possible to improve the followability of the output of the steam generator 2 with respect to the load command value that greatly increases.
　Also in the embodiment shown in FIG. 9, unless otherwise specified, control of each mode regarding the flowchart shown in FIG. 5 described based on the above-described embodiment can be performed.
[0083]
　Also, in step S202, both the first ignition torch 17a and the second ignition torch 17b may be ignited. In this case, by igniting both the first ignition torch 17a and the second ignition torch 17b, the amount of heat input from the burner unit 12 to the furnace 6 can be further increased, and steam is generated in response to a greater change in the load command value. The output of the generator 2 can be made to follow.
[0084]
　Further, the steam generator 2 having the above configuration is controlled according to the flowchart shown in FIG. is ignited (see steps S302 and S303 in FIG. 7), the output of the steam generator 2 may more favorably follow the fluctuations in the load command value.
　Also in the embodiment shown in FIG. 9, unless otherwise specified, control of each aspect regarding the flowchart shown in FIG. 7 described based on the above-described embodiment can be performed.
[0085]
　When the ignition torch 17 is ignited in step S302 of FIG. 7, the first ignition torch 17a belonging to the burner unit 12 in which the solid fuel burner 14 is extinguished may be preferentially ignited. As a result, when the first ignition torch 17a is ignited by the burner unit 12 in which the solid fuel burner 14 is in an ignited state, the output of the burner unit 12 becomes larger than usual, so that the heat input to the surrounding furnace wall becomes excessive. may become Therefore, by preferentially igniting the first ignition torch 17a in the burner unit 12 in which the solid fuel burner 14 is extinguished, such excessive heat input is prevented and the furnace wall around the burner unit 12 is protected. be able to.
[0086]
　When the ignition torch 17 is ignited in step S302 of FIG. 7, the second ignition torch 17b belonging to the burner unit 12 whose starting burner 15 is extinguished may be preferentially ignited. As a result, when the second ignition torch 17b is ignited by the burner unit 12 in which the start-up burner 15 is in an ignited state, the output of the burner unit 12 becomes greater than in normal times, and heat input to the surrounding furnace wall becomes excessive. may become Therefore, by preferentially igniting the second ignition torch 17b in the burner unit 12 in which the starting burner 15 is extinguished, such excessive heat input is prevented and the furnace wall around the burner unit 12 is protected. be able to.
[0087]
　When igniting the ignition torch 17 and the starter burner 15 in steps S302 and S303 of FIG. At least one of the first ignition torch 17a and the second ignition torch 17b of the burner unit 12 included in the burner set in which the fuel burner 14 is in an unignited state (for example, in the embodiment shown in FIG. 9, the lowest burner set BS1) , the start-up burner 15 included in the burner unit 12 to which the ignition torch 17 belongs may be ignited. When a plurality of burner units 12 are arranged in the vertical direction, even if the solid fuel burner 15 on the upper side is not ignited, if the solid fuel burner 14 on the lower side has been ignited, the solid fuel burner 14 Since the pilot flame of the starting burner 15 can be ensured by the flame rise of , there is no problem in ignitability. On the other hand, when the solid fuel burner 14 on the lower side is not ignited, there is no pilot light for the starting burner 15 belonging to the same burner unit 12 as the solid fuel burner 14, so the starting burner 15 is difficult to ignite. There is In this embodiment, at least one of the first ignition torch 17a and the second ignition torch 17b is ignited prior to the starting burner 15 in the burner unit 12 in which at least the lowest solid fuel burner 14 is in an unignited state. , it is possible to form a pilot light for the start-up burner 15 and improve ignitability.
[0088]
　In this case, the fuel pressure or flow rate in the starting burner fuel supply system 72a and the ignition torch fuel supply system 72b may be controlled according to the load command value. Such pressure or fuel control is performed based on the measured values ​​of pressure gauges or flow meters in the starting burner fuel supply system 72a and the ignition torch fuel supply system 72b. is controlled so that the pressure or flow rate increases, and is controlled so that the pressure or flow rate decreases when the load command value decreases.
[0089]
　As described above, according to the above embodiment, when the load command value increases, the heat input to the furnace is increased by controlling the ignition torch 17 to the ignition state. As a result, even when the load change rate of the steam generator 2 is large, the load of the steam generator 2 can follow the load change with good responsiveness.
[0090]
(1) A steam generator according to some embodiments of the present disclosure is a
　steam generator capable of generating steam to be supplied to a steam utilization device (eg, the steam utilization device 4 of the above embodiment) A steam generator 2) comprising a
　furnace (for example, the furnace 6 in the above embodiment),
　a solid fuel burner capable of forming a flame in the furnace using a solid fuel (for example, the solid fuel burner 14 in the above embodiment), A plurality of burner units (for example, the burner in the above embodiment) provided on a furnace wall defining the furnace, including an ignition torch (for example, the ignition torch 17 in the above embodiment) capable of forming an ignition flame for the solid fuel burner. unit 12), and a controller capable of controlling the plurality of burner units (for example ,
　the controller 70 of the above embodiment) 　. The ignition torch is ignited in at least some of the plurality of burner units.

[0091]
　According to the aspect (1) above, when the load command value suddenly increases, the heat input to the furnace is increased by igniting the ignition torch. As a result, even when the load change rate of the steam generator is large, the load of the steam generator can follow the load change with good responsiveness.
[0092]
(2) In some aspects, in the above aspect (1),
　each of the plurality of burner units further includes a start-up burner (for example, the start-up burner 15 in the above embodiment) used when starting up the steam generator. The controller ignites
　the start-up burners in at least some of the plurality of burner units when the load command value increases.
[0093]
　According to the aspect (2) above, when the load command value increases more rapidly, the heat input to the furnace is further increased by igniting the starting burner in addition to the ignition torch. As a result, even when the load change rate of the steam generator is large, the load of the steam generator can follow the load change with good responsiveness.
[0094]
(3) In some embodiments, in the aspect of (2) above, the
　control unit activates the start-up burner of the burner unit to which the solid fuel burner in the ignited state belongs when the load command value increases. Operate the ignition.
[0095]
　According to the aspect (3) above, when the load command value increases abruptly, the starting burner of the burner unit in which the solid fuel burner is in the ignited state is ignited. In the burner unit in which the solid fuel burner is ignited, the starting burner can be easily ignited because the area around the ignited solid fuel burner is at a high temperature. As a result, the time from the ignition operation of the starting burner to the completion of ignition can be shortened, and the control can be performed with a quicker response.
[0096]
(4) In some aspects, in the aspect (2) above,
　when the load command value increases, the control unit activates the start-up burner of the burner unit to which the unignited solid fuel burner belongs. Operate the ignition.
[0097]
　According to the aspect (3) above, by igniting the starting burner of the burner unit in which the solid fuel burner is in an unignited state when the load changes, both the solid fuel burner and the starting burner are ignited in the specific burner unit. It is possible to improve followability to load changes while preventing excessive heat input to the furnace wall in the vicinity of the burner unit due to the ignition state.
[0098]
(5) In some embodiments, in any one aspect of (2) to (4) above,
　when the load command value increases, the control unit ignites the ignition torch, then ignites the ignition The starter burner included in the burner unit to which the torch belongs is ignited.
[0099]
　According to the aspect (5) above, when the load command value is increased, the ignition torch is first ignited, thereby generating a pilot light for the subsequent ignition operation of the start-up burner. As a result, smooth ignition operation of the starting burner becomes possible, and control with quicker response becomes possible.
[0100]
(6) In some embodiments, in the aspect of (5) above, the
　plurality of burner units are provided along the vertical direction with respect to the furnace, and the
　control unit controls, when the load command value increases, After igniting the ignition torch of the burner unit in which at least the solid fuel burner in the lowermost stage is in an unignited state, the starting burner included in the burner unit to which the ignition torch belongs is ignited.
[0101]
　When multiple burner units are arranged in the vertical direction, even if the solid fuel burner on the upper side has not ignited, if the solid fuel burner on the lower side has ignited, the flame of the solid fuel burner will rise. Since the pilot light of the starter burner can be secured, there is no problem with ignitability. On the other hand, when the solid fuel burner on the lower side is not ignited, there is no pilot light for the starting burner belonging to the same burner unit as the solid fuel burner, so the starting burner may be difficult to ignite. According to the above aspect (6), in the burner unit in which at least the lowest solid fuel burner is in an unignited state, the pilot light of the starting burner is ignited by igniting the ignition torch prior to the starting burner. can form and improve ignitability.
[0102]
(7) In some aspects, in any one aspect of (1) to (6) above, the
　control unit ignites the ignition torches in all the burner units when the load command value increases. do.
[0103]
　According to the aspect (7) above, when the load command value increases, the ignition torches in all the burner units are ignited. As a result, the amount of heat input to the furnace by the ignition torch of each burner unit can be maximized, and the responsiveness to the load command value can be further improved.
[0104]
(8) In some aspects, in any one aspect of (1) to (6) above,
　when the load command value increases, the control unit controls the ignition torch in some of the plurality of burner units. to ignite.
[0105]
　According to the above aspect (8), when the load command value increases, the ignition torches of some of the burner units are ignited, thereby optimizing the amount of heat input to the furnace by the ignition torches. That is, by adjusting the number of ignition torches to be ignited, it is possible to prevent the heat input to the furnace from becoming excessive due to the ignition of the ignition torches, protect the surroundings of the burner unit, and provide good performance against load changes. Responsiveness is obtained.
[0106]
(9) In some aspects, in any one aspect of (1) to (8) above, the
　control unit ignites the ignition torches in the plurality of burner units simultaneously when the load command value increases. Manipulate.
[0107]
　According to the above aspect (9), when the load command value increases rapidly, a plurality of ignition torches are simultaneously ignited, thereby quickly inputting heat to the furnace by igniting the ignition torch, thereby achieving a favorable Responsiveness is obtained.
[0108]
(10) In some aspects, in any one aspect of (1) to (9) above, the
　control unit extinguishes the plurality of ignition torches that have been ignited at different timings.
[0109]
　According to the aspect (10) above, when the plurality of ignition torches 17 controlled to be in the ignition state at the time of load change are controlled to be in the extinguishing state, the extinguishing timings of these ignition torches 17 are controlled to be different. If a plurality of ignition torches were extinguished at the same time, the amount of heat input to the furnace would change significantly, which could make the combustion state unstable. Therefore, by making the extinguishing timings of the plurality of ignition torches different, it is possible to effectively prevent the combustion state from becoming unstable.
[0110]
(11) In some aspects, in any one aspect of (2) to (6) above,
　in each of the plurality of burner units, the solid fuel burner and the starting burner have the same center axis. are arranged concentrically.
[0111]
　According to the above aspect (11), in a steam generator having a layout in which the solid fuel burner and the start-up burner are arranged concentrically, the load can follow the load with good responsiveness when the load command value increases.
[0112]
(12) In some aspects, in any one aspect of (2) to (6) above , each of the plurality of burner units further includes a 　start
　-up burner used when starting the steam generator,
A pair of solid fuel burners are arranged on both sides of the solid fuel burner, and the
　ignition torch is a first ignition torch (for example, the first ignition torch 17a in the above embodiment) capable of forming an ignition flame for the solid fuel burner; and a second ignition torch (for example, the second ignition torch 17b in the above embodiment) capable of forming an ignition flame for the starter burner.
[0113]
　According to the above aspect (12), in the steam generator having a layout in which a pair of solid fuel burners are arranged on both sides of the starting burner, and ignition torches are provided for each of the solid fuel burner and the starting burner, the load command The load can follow with good responsiveness when the value increases.
[0114]
(13) In some aspects, in the above aspect (12), the
　control unit ignites the first ignition torch and the second ignition torch when the load command value increases.
[0115]
　According to the above aspect (13), by igniting both the first ignition torch and the second ignition torch when the load command value increases, the amount of heat input by the ignition torch can be increased, and the responsiveness can be further improved.
[0116]
(14) In some aspects, in any one aspect of (1) to (13) above, the
　control unit increases the load command value when the rate of change of the load command value is equal to or greater than a reference value. It is determined that
[0117]
　According to the above aspect (14), the load of the steam generator can be follow-up controlled with good responsiveness to a large load change such that the change rate of the load command value reaches or exceeds the reference value.
[0118]
(15) A plant according to some embodiments of the present disclosure (for example, the plant 1 of the above embodiment) includes
　the steam generator of any one aspect of (1) to (14) above (for example, the steam generation of the above embodiment). and the
　steam utilization device (for example, the steam utilization device 4 of the above embodiment)
.
[0119]
　According to the above aspect (15), when the load command value for the steam generator increases with a change in demand for the steam utilization device, the heat input to the furnace is increased by igniting the ignition torch. As a result, even when the load change rate of the steam generator is large, the load of the steam generator can follow the load change with good responsiveness, and the demand change of the steam utilization apparatus can be handled.
[0120]
(16) A steam generator control method according to some embodiments of the present disclosure includes a
　furnace (for example, the furnace 6 in the above embodiment) and
　a solid fuel burner capable of forming a flame in the furnace using solid fuel ( For example, the solid fuel burner 14 of the above embodiment) and an ignition torch capable of forming an ignition flame for the solid fuel burner (for example, the ignition torch 17 of the above embodiment) are provided on a furnace wall that defines the furnace. and a plurality of burner units (for example, the burner unit 12 of the above embodiment)
,
　wherein when the load command value for the steam generator increases, at least one of the plurality of burner units A portion of the ignition torch is ignited (for example, step S202 in FIG. 5 of the above embodiment).
[0121]
　According to the aspect (16) above, when the load command value increases, the heat input to the furnace is increased by igniting the ignition torch. As a result, even when the load change rate of the steam generator is large, the load of the steam generator can follow the load change with good responsiveness.
Code explanation
[0122]
1 Plant
2 Steam Generator
4 Steam Utilization Device
6 Furnace
8 Combustion Device
10 Flue
12 Burner Unit
14 Solid Fuel Burner
15 Starting Burner
16 Solid Fuel Supply Pipe
17 Ignition Torch
17a First Ignition Torch
17b Second Ignition Torch
18 Crusher
20 wind box
22 primary superheater
24 secondary superheater
26 tertiary superheater
28 primary reheater
29 secondary reheater
30 economizer
32 high pressure turbine
34 medium and low pressure turbine
36 generator
38 main steam valve
40 main steam pipe
42 High- pressure turbine discharge pipe
44 Reheat steam valve
46 Reheat steam pipe
48 Mid-low pressure turbine discharge pipe
50 Condenser
52 Feed water pipe
54 Feed water pump
56 Steam turbine for driving feed water pump
58 High pressure steam extraction pipe
60 Middle/low pressure steam extraction pipe
62 High pressure steam extraction valve
63 Turbine bypass valve
64 Middle/low pressure steam extraction valve
65 Drain water pipe
66 Steam water Separator
68 Furnace wall
pipe 69 Turbine bypass pipe
70 Control unit
72a Starting burner fuel supply system
72b Ignition torch fuel supply system
74 Fuel tanks
76, 103 Fuel supply main pipes 82,
104 Pumps 84,
106 Pressure gauges
86, 108 Flow meter
88, 110 flow control valve
90 shutoff valve
92 starting burner valve
93 leak check valve
94 leak check pipes
96, 114 pressure control lines
98, 116 pressure control valve
100, 118 return pipes
102, 120 circulation valve
112 ignition torch valve
The scope of the claims
[Claim 1]
　A steam generator capable of generating steam to be supplied to a steam utilization apparatus, 　comprising: a furnace; a solid fuel burner capable of forming a flame in the furnace using a solid fuel; and an ignition flame of the solid fuel burner
　.
a plurality of burner units provided in a furnace wall defining the furnace, the
　control unit being operable to control the plurality of burner units, the control unit controlling
the
　steam generation; A steam generator that ignites the ignition torch in at least some of the plurality of burner units when a load command value for the apparatus increases.
[Claim 2]
　Each of the plurality of burner units further includes a start-up burner used when starting up the steam generator, and the
　control unit controls at least some of the plurality of burner units to The steam generator according to claim 1, wherein the starting burner is ignited.
[Claim 3]
　3. The steam generator according to claim 2, wherein said control unit ignites said start-up burner of said burner unit to which said solid fuel burner in an ignited state belongs, when said load command value increases.
[Claim 4]
　3. The steam generator according to claim 2, wherein, when the load command value increases, the control unit ignites the start-up burner of the burner unit to which the unignited solid fuel burner belongs.
[Claim 5]
　5. The method according to claim 2, wherein when the load command value increases, the control unit ignites the start-up burner included in the burner unit to which the ignition torch belongs after igniting the ignition torch. Steam generator according to any one of the preceding claims.
[Claim 6]
　The plurality of burner units are provided along the vertical direction with respect to the furnace, and the
　control section controls the burner unit, when the load command value increases, at least the lowermost solid fuel burner is in an unignited state. 6. The steam generator according to claim 5, wherein after the ignition torch of the burner unit is ignited, the start-up burner included in the burner unit to which the ignition torch belongs is ignited.
[Claim 7]
　7. The steam generator according to any one of claims 1 to 6, wherein said control unit ignites said ignition torches in all said burner units when said load command value increases.
[Claim 8]
　The steam generator according to any one of claims 1 to 6, wherein the control unit ignites the ignition torch in some of the plurality of burner units when the load command value increases.
[Claim 9]
　9. The steam generator according to any one of claims 1 to 8, wherein said control unit simultaneously ignites said ignition torches in said plurality of burner units when said load command value increases.
[Claim 10]
　10. The steam generator according to any one of claims 1 to 9, wherein the control unit extinguishes the plurality of ignition torches at different timings.
[Claim 11]
　7. The steam generator according to any one of claims 2 to 6, wherein in each of said plurality of burner units, said solid fuel burner and said start-up burner are concentrically arranged such that their central axes are aligned. .
[Claim 12]
　Each of the plurality of burner units further includes a start-up burner used when starting up the steam generator,
　a pair of the solid fuel burners are arranged on both sides of the start-up burner, and the
　ignition torch is connected to the solid fuel. 7. Steam according to any one of claims 2 to 6, comprising a first ignition torch capable of forming a burner ignition flame and a second ignition torch capable of forming an ignition flame of the starting burner. Generator.
[Claim 13]
　13. The steam generator according to claim 12, wherein said control unit ignites said first ignition torch and said second ignition torch when said load command value increases.
[Claim 14]
　The steam generator according to any one of claims 1 to 13, wherein the controller determines that the load command value has increased when a rate of change of the load command value is equal to or greater than a reference value.
[Claim 15]
　A plant comprising the steam generator according to any one of claims 1 to 14 and the
　steam utilization device
.
[Claim 16]
　a furnace,
　a solid fuel burner capable of forming a flame in the furnace using a solid fuel, and an ignition torch capable of forming an ignition flame for the solid fuel burner; and a plurality of burner units , wherein the ignition torch is ignited in at least part of the plurality of burner units when a load command value for
the
　steam generator increases. , a control method for a steam generator.