The present invention relates to an oxygen concentration control apparatus and method of the heating furnace.
BACKGROUND
[2]
In general, the heating in the air (Air) and fuel (Fuel) the air-fuel ratio of the (Air Fuel Ratio: AFR) can be properly adjusted to be improved, the efficiency of the stability and the combustion of the combustion, and this combustion for the heating furnace according the controls are needed.
[3]
[4]
1 is a conceptual view showing a combustion control in a conventional heating.
[5]
If 1 is to be drawn to SAMA (Scientific Apparatus Makers Association) notation, with reference to Figure 1, the combustion control of the heating furnace using the fuel flow rate set value 10 and the air-fuel ratio (AFR), a correction value (20), a fuel valve controlling a fuel supply amount through (fuel Value), and also controls the air supply through the air daembeo (air Damper).
[6]
Here, the air-fuel ratio (AFR), a correction value (20) was determined by an oxygen concentration set point by the fuel flow rate set value 10 and the user. The detailed description can be referred to in call Korea Patent Publication No. 2009-0069607.
[7]
[8]
Invention favors the Korea Patent Publication No. 2009-0069607 has the air flow rate is theoretically possible to always maintain large maintain safe combustion situation can be prevented by incomplete combustion than the required air flow rate, but the oxygen concentration set value of the user setting a schedule or more If the input value was caused a problem that the heat loss increases.
[9]
[10]
Also, the air-fuel ratio control technique, as shown in improving the thermal efficiency of the furnace and Figure 2 as a method for supplying the air flow rate in the proper combustion zone have been proposed.
[11]
[12]
2 is a block diagram of the air-fuel ratio control system of a conventional heating.
[13]
Figure 2 is when that shown depending on the SAMA (Scientific Apparatus Makers Association) notation, with reference to Figure 2, the air-fuel ratio control system of a conventional heating, the fuel flow rate set point and an oxygen content of variance (O according to user 2 using a bias) to set the oxygen concentration set point (O 2 sv), the fuel flow rate setting part (21), the oxygen concentration set point (O to provide a 2 sv) and the oxygen concentration measured value (O 2 service using the pv) discharge rate value (βa) oxygen concentration control part 22, by using the carbon monoxide concentration measured in the flue-gas output limit the upper limit value / lower limit value (β to H / β L ), carbon monoxide limiter adjustment part 23, the discharge rate value (βa), wherein the output limit to obtain the the upper limit value / lower limit value (β H / β L ), the upper limit value for limiting a / lower limit value limiting part 24, the output mode selecting part for selecting one of said process output ratio value (βa) and manually set ratio value (βm) determined from ( 25), and the selected output Using yulgap includes an air-fuel ratio determining part 26 to obtain the air-fuel ratio (AFR), a correction value.
[14]
The detailed description can be referred to in call Korea Patent Publication No. 2009-0068810.
[15]
[16]
In this air-fuel ratio control system of a conventional heating, the oxygen concentration is set by the user to an oxygen concentration control variance (bias) is directly so used for the oxygen concentration set, but can maintain a safe combustion, carbon monoxide is outside the acceptable range it is impossible to achieve optimum combustion, such as.
[17]
(Prior art document)
[18]
[Patent Document 1] Korea Patent Publication No. 2009-0069607 No.
[19]
[Patent Document 2] Korea Patent Publication No. 2009-0068810 No.
[20]
Detailed Description of the Invention
SUMMARY
[21]
One embodiment of the invention, the combustion control system of the combustion equipment, such as heat, oxygen (O 2 ) concentration set point of carbon dioxide (CO) oxygen concentration set point auto-calibration of the heating to that can be automatically corrected by using the density It provides a method and a combustion control system.
Problem solving means
[22]
By one embodiment of the invention, the part 1 oxygen concentration variance set received first set the oxygen concentration of variance; If the carbon monoxide measurements of the exhaust gas out of the carbon monoxide tolerances, part 2 variate oxygen concentration calculated to obtain the second oxygen concentration variance using the oxygen concentration measurement of the carbon monoxide measured and the exhaust gas; It said first oxygen concentration variance and the second oxygen concentration to provide an oxygen concentration variance using the second oxygen concentration variate variate provider; And the set value correcting section for correcting the oxygen concentration of the oxygen concentration set point using the oxygen concentration variance; An oxygen concentration control apparatus for a heating furnace including a proposed.
[23]
[24]
In the solution means of this problem, there is provided one of the various concepts described in the detailed description. This assignment solution is, not intended to identify key technologies or essential description of the claimed subject matter, will only described one of the claimed subject matter is, the claimed subject matter of each of which are described in detail in the following detailed description.
Effects of the Invention
[25]
According to one embodiment of the present invention, by setting to the combustion control system of the combustion plant, such as by heating, while meeting the allowable range of the carbon monoxide to maintain the optimum combustion without the intervention of the driver automatically compensates for the oxygen concentration set value, there is an effect that it is possible to maintain optimal combustion and maximum efficiency.
Brief Description of the Drawings
[26]
1 is a conceptual view showing a combustion control in a conventional heating.
[27]
2 is a block diagram of the air-fuel ratio control system of a conventional heating.
[28]
3 is one example of an oxygen concentration control apparatus according to an embodiment of the present invention.
[29]
Figure 4 is a graph of heat loss according to the relationship between carbon monoxide and oxygen concentration.
[30]
5 is a diagram illustrating internal blocks of the oxygen concentration control device of Fig.
[31]
6 is one example of how to control the oxygen concentration according to an embodiment of the present invention.
[32]
Figure 7 is an illustrative diagram showing the calculation process of the second oxygen concentration variance (bias) of FIG.
[33]
Mode for the Invention
[34]
Hereinafter, the present invention is not limited to the embodiments described, it is to be understood that the same may be variously changed without departing from the spirit and scope of the invention.
[35]
In each embodiment of the present invention, the structure, shape and the value that is described as one example of the scope of the invention only an example to aid the technological details understanding of the invention, not limited to this If you are departing from that document it can be varied to be understood. Embodiments of the present invention can be made a number of new examples of embodiments are combined with each other.
[36]
Then, the components having substantially the same configuration and function as the light of the overall teachings of the present invention in reference to the drawings the invention will use the same reference numerals.
[37]
[38]
Hereinafter, in order to be able to easily carry out self this invention one of ordinary skill in the art, with reference to the accompanying drawings, an embodiment of the present invention will be described in detail.
[39]
[40]
3 is one example of an oxygen concentration control apparatus according to an embodiment of the present invention.
[41]
Figure 3 is a SAMA (Scientific Apparatus Makers Association) if that shown depending on the notation, refer to Figure 3, an oxygen concentration control apparatus according to an embodiment of the present invention, the oxygen concentration variance (O 2 _bias) corrector 100 and it may include an oxygen concentration set value correcting section 200.
[42]
The oxygen concentration of variance (O 2 _bias) correcting section 100, using the carbon monoxide measurements (COpv) of the exhaust gas oxygen concentration variance (O 2 in order to correct the _bias), a first oxygen concentration variance setting unit 110, it is possible to include a second oxygen concentration variance calculation section 120 and the oxygen concentration variance provider 130.
[43]
[44]
On the other hand, with reference to Figure 3, in the prior literature, such as are described, the technical features of the present invention, the prior art and for which duplicates Korea Patent Publication No. 2009-0069607 and Korea Patent Publication No. 2009-0068810 No. No. It can be referred to can be omitted.
[45]
[46]
It said first oxygen concentration variance setting unit 110, a first oxygen concentration variance (O 2 can be set _bias1). In one embodiment, a first oxygen concentration variance (O 2 _bias1) may be set by the user in advance to compensate for the oxygen concentration set point.
[47]
In one embodiment, a first oxygen concentration variance (O that can be set by the user 2 , even if only by correcting the oxygen concentration set point _bias1), so that when the carbon monoxide in the exhaust gas is outside the allowable range occurs, as described below in the present invention, the second oxygen concentration variance (O 2 utilizes _bias2) further more.
[48]
[49]
Said second oxygen concentration variance calculation unit 120, the carbon monoxide measurements (COpv) of the exhaust gas is carbon monoxide tolerance range (CO L ~ CO H is out of) the carbon monoxide measurements (COpv) and the oxygen concentration measured in the exhaust gas (O 2 using pv) the second oxygen concentration variance (O 2 can be obtained _bias2).
[50]
Here, the carbon monoxide measurements (COpv) of the exhaust gas can be measured by the carbon monoxide sensor, the oxygen concentration measured value (O 2 pv) may be measured by the oxygen sensor and the carbon monoxide tolerance range is carbon monoxide lower limit value set in advance ( CO L ) and the upper limit of carbon monoxide (CO H may be defined by a).
[51]
[52]
The oxygen concentration variance provider 130, the first oxygen concentration variance setting unit 110, the first oxygen concentration variance (O of from 2 wherein from _bias1) and said second oxygen concentration variance calculation section 120 a second oxygen concentration variance (O 2 using a _bias2) oxygen concentration variance (O 2 can provide _bias).
[53]
For example, the oxygen concentration variance provider 130, the first oxygen concentration variance (O 2 _bias1) and said second oxygen concentration variance (O 2 _bias2) the addition to the oxygen concentration variance (O 2 available to _bias) can.
[54]
[55]
The oxygen concentration set value correcting section 200, the oxygen concentration of variance (O 2 using a _bias) the oxygen concentration set point (O 2 can correct the sv).
[56]
For example, the oxygen concentration set value correcting section 200, the concentration of oxygen prepared in the pre-set value (O 2 The oxygen concentration variance (O in sv) 2 plus _bias) the oxygen concentration set point (O 2 can correct the sv) .
[57]
[58]
In Figure 3, the oxygen concentration of variance (O 2 _bias) correcting section 100, a first oxygen concentration variance setting unit 110, the second oxygen concentration variance calculation unit 120, and an oxygen content of variance provider 130 and the oxygen each concentration set value correcting section 200 is, for example, be implemented as a combination of a software programmed to perform the operations specified group are hardware mounted thereto, such as a microprocessor (microprocessor).
[59]
The hardware may include at least one processing unit and a memory. In this case, the processing unit is, for example, a signal processor (signal processor), microprocessor (microprocessor), CPU (Central Processing Unit), ASIC (Application Specific Integrated Circuit, ASIC), and Field Programmable Gate Arrays (FPGA) It may include at least one.
[60]
The memory may include at least one of a volatile memory (e.g., RAM, etc.), non-volatile memory (e.g., ROM, flash memory, etc.).
[61]
[62]
In the drawings of the present document, unnecessary duplicate description of the same reference numeral as possible, and components of the same function can be omitted.
[63]
[64]
Figure 4 is a graph of heat loss according to the relationship between carbon monoxide and oxygen concentration.
[65]
Referring to FIG. 4, a potent than carbon monoxide in the flue gas in the combustion state is substantially completely free to find a more advantageous in terms of fuel efficiency.
[66]
In Figure 4, an oxygen concentration control apparatus according to an embodiment of the invention the heat loss (heat loss) in the combustion zone is that the cheapest, the lower limit and the upper limit of carbon monoxide concentration (CO L , CO H of oxygen controlled to be maintained) need can be seen.
[67]
[68]
5 is a diagram illustrating internal blocks of the oxygen concentration control device of Fig.
[69]
[70]
5, the second oxygen concentration variance calculation section 120 is carbon monoxide determination unit 121, a carbon monoxide calculation unit 122, the oxygen change amount calculation unit 123 and the second oxygen concentration variance calculation section 124 It may contain.
[71]
It said second oxygen concentration variance calculation unit 120 may further include a signal transmitting unit 125.
[72]
[73]
The carbon monoxide determination unit 121, the carbon monoxide measurements (COpv) the carbon monoxide tolerance range (CO L ~ CO H may determine whether the outside).
[74]
For example, the carbon monoxide determination unit 121, the carbon monoxide measurements (COpv) the carbon monoxide tolerance range (CO L ~ CO H without departing from the), a second oxygen concentration variance (O 2 without calculating the _bias2), the carbon monoxide measured value (COpv) the carbon monoxide tolerance range (CO L ~ CO H 2 oxygen variance (O through a process such as to fall outside of the), 2 calculates a _bias2).
[75]
[76]
The carbon monoxide calculation unit 122 can calculate a moving average value (COpv, avg (t)) for the measurement of carbon monoxide (COpv).
[77]
For example, the carbon monoxide calculation section 122 to the moving average value (COpv, avg (t)) of the carbon monoxide measurements (COpv) can be derived using the following equation.
[78]
[79]
[Formula 1]

[80]
[81]
In Equation 1, COpv, avg is the average shift of the carbon monoxide measurements, N is a natural number of 1 or more, t is the time variable.
[82]
[83]
The oxygen change amount calculation unit 123, the moving average value (COpv, avg (t)) and the oxygen concentration measured value (O of said carbon monoxide measurement (COpv) 2 oxygen concentration variation (ΔO using pv) 2 (t)) the can be calculated.
[84]
In one embodiment, the oxygen change amount calculation unit 123 is the change in oxygen concentration (ΔO 2 can be calculated using the following a (t)) Equation (2).
[85]
[86]
[Formula 2]

[87]
[88]
In Equation 2, A is a sensitivity factor, ΔO 2 (t) is the oxygen concentration variation, dO 2 pv, avg is a differential value of the oxygen concentration measured moving average, dCOpv, avg is the movement of the carbon monoxide measurements (COpv) average differentials, ΔCO (t) is the amount of change of the carbon monoxide measurements, and B is the offset adjustment (for example, B = 1).
[89]
[90]
Said second oxygen concentration variance calculation unit 124, the change in oxygen concentration (ΔO 2 using a (t)) a second oxygen concentration variance (O 2 can calculate the _bias2).
[91]
In one embodiment, the second oxygen concentration variance calculation section 124 and the second oxygen concentration variance (O 2 can be calculated by an _bias2) using the equation (3).
[92]
[93]
[Formula 3]

[94]
[95]
In Equation 3, O 2 _bias2 the second oxygen concentration variance and, ΔO 2 and (t) is the oxygen concentration variation at the time point of time (t), O 2 (T-1) time is the time (t-1) the oxygen concentration in the.
[96]
[97]
In addition, the signal transmission unit 125 sends a second oxygen concentration variance (O2_bias2) from the second oxygen concentration variance calculation unit 124, the oxygen concentration variance provider 130.
[98]
For example, in Figure 5, f4 (t) is a function using the carbon monoxide measurements (COpv) for calculating a second oxygen concentration variance (O2_bias2), the carbon monoxide determination unit 121, the carbon monoxide, as described above It may include a calculation unit 122, the oxygen change amount calculation unit 123 and the second oxygen concentration variance calculation section 124.
[99]
[100]
Said second oxygen concentration variance calculation unit 120, the carbon monoxide measurements (COpv) the carbon monoxide tolerance range (CO L ~ CO H without departing from the), a second oxygen concentration variance (O 2 to _bias2) the oxygen concentration variance claim studies do not provide a 130, the carbon monoxide measurements (COpv) the carbon monoxide tolerance range (CO L ~ CO H ) a, calculated by the above described process, the second oxygen concentration variance (O outside 2 _bias2) the the oxygen concentration variance may provide a supply unit (130).
[101]
[102]
According to one embodiment of the present invention as described above, using a concentration of carbon monoxide by automatically correcting the oxygen concentration set point, and allows the control of the oxygen concentration and the air-fuel ratio, optimized to this end the concentration of carbon monoxide off-gas through It can be adjusted with the aim of maintaining the combustion, so that it is possible to maintain the optimum combustion and maximum thermal efficiency.
[103]
[104]
Then, refer to Figs. 3 to 7, the description will be made as to how to control the oxygen concentration. In this application document, description of the control method and the oxygen concentration of the oxygen concentration control device, unless there are special circumstances, can be applied to complement each other.
[105]
[106]
6 is one example of how to control the oxygen concentration according to an embodiment of the present invention.
[107]
If 3 to 6, in the in the oxygen concentration control method according to an embodiment of the present invention, step S100, by the first oxygen concentration variance setting unit 110, be a carbon monoxide measurement (COpv) of the exhaust gas input can.
[108]
In step S200, the second, the measurement of carbon monoxide (COpv) by the oxygen concentration variance calculation unit 120 the allowable range of carbon monoxide (CO L ~ CO H can be determined whether or not out of).
[109]
In step S300, the second by the oxygen concentration variance calculation unit 120, the carbon monoxide measurements (COpv) and the oxygen concentration measured in the exhaust gas (O 2, the second oxygen concentration variance (O using pv) 2 becomes the _bias2) sphere can.
[110]
In step S400, the carbon monoxide measurements (COpv) the carbon monoxide tolerance range (CO by oxygen concentration variance supply unit (130) L ~ CO H ) of said first oxygen concentration variance (O Outside 2 _bias1) and the second 2, the oxygen concentration variance (O 2 to _bias2) oxygen concentration variance (O using 2 has _bias) it can be calculated.
[111]
In step S500, the carbon monoxide measurements (COpv) the carbon monoxide tolerance range (CO L ~ CO H without departing from the), the first oxygen concentration variance (O 2 is _bias1) oxygen concentration variance (O 2 may be provided at a _bias) .
[112]
And, in step S600, in which the oxygen concentration variance (O by an oxygen concentration set value correcting section 200, two oxygen concentration set point (O using _bias) 2 can be sv) correction.
[113]
The corrected through a process as described above, the oxygen concentration set point (O 2 sv) may be used to control the oxygen and the air-fuel ratio correction of the furnace in order to maintain optimum combustion.
[114]
[115]
Figure 7 is an illustrative diagram showing the calculation process of the second oxygen concentration variance (bias) of FIG.
[116]
Referring to Fig. 3 to 7 by the second oxygen concentration variance (O 2 will be described in steps (S300) to obtain the _bias2).
[117]
First, in step S310, the moving average value (COpv, avg (t)) for the measurement of carbon monoxide (COpv) may be calculated according to the equation (1).
[118]
In step S320, by using the moving average value (COpv, avg (t)) of the carbon monoxide measurements (COpv) to change the carbon monoxide (ΔCO (t)) it can be obtained according to the equation (4).
[119]
[120]
[Formula 4]

[121]
[122]
In Equation 4, COpv, avg (t-1) is carbon monoxide at the point of time (t-1) is a moving average value for the carbon monoxide measurements (COpv) at the time, COpv, avg (t) is the time (t) a moving average value for the measured value (COpv).
[123]
[124]
In step S330, moving average values (COpv, avg (t)) , the oxygen concentration measured value (O of said carbon monoxide measurement (COpv) 2 pv) and oxygen concentration change by using the carbon monoxide change amount (ΔCO (t)) (ΔO 2 (t)) can be calculated according to the equation (2).
[125]
And, in step S340, the oxygen concentration variation (ΔO 2 (t)) a second oxygen concentration variance (O using 2 _bias2) is may be calculated according to the equation (3).

WE Claims

The part 1 oxygen concentration variance set received first set the oxygen concentration of variance; If the carbon monoxide measurements of the exhaust gas out of the carbon monoxide tolerances, part 2 variate oxygen concentration calculated to obtain the second oxygen concentration variance using the oxygen concentration measurement of the carbon monoxide measured and the exhaust gas; It said first oxygen concentration variance and the second oxygen concentration to provide an oxygen concentration variance using the second oxygen concentration variate variate provider; And the set value correcting section for correcting the oxygen concentration of the oxygen concentration set point using the oxygen concentration variance; Heating an oxygen concentration control apparatus for a containing.
[Claim 2]
The method of claim 1, wherein the carbon monoxide determination unit that the second oxygen concentration variance calculator comprises: a carbon monoxide measurement determine if the carbon monoxide out of the allowable range; Carbon monoxide calculation section for calculating a moving average value for the measurement of carbon monoxide; Calculation unit for calculating the amount of change of oxygen concentration change in oxygen by using a moving average value and the oxygen concentration measurement of the carbon monoxide measurements; And part 2 oxygen variance calculation to calculate a second oxygen concentration variance using the oxygen concentration variation; Including, if the carbon monoxide reading is departing from the carbon monoxide tolerance range, the second does not provide the oxygen concentration variance, if the carbon monoxide measured value is out of the carbon monoxide tolerance range, the oxygen concentration in the heating as provided by the second oxygen concentration variance controller.
[Claim 3]
The method of claim 2, wherein the carbon monoxide calculation section to the moving average value of said carbon monoxide measurement equation, obtained using, and the above equation, COpv, avg is the average shift of the carbon monoxide measurements, N is a natural number of 1 or more, t an oxygen concentration control apparatus for a heating time is variable.
[Claim 4]
The method of claim 2, wherein the oxygen change amount calculation section to the oxygen concentration change in expression, obtained using the equation, ΔO 2 (t) is the oxygen concentration variation, A is a sensitivity factor, dO 2 pv, avg is derivative in the oxygen concentration of the measurement a moving average, dCOpv, avg is the oxygen concentration control device of a variation of the differential value, the carbon monoxide measurements ΔCO (t) of the moving average of the measured carbon monoxide, and the B is offset adjustment heating.
[Claim 5]
The method of claim 2, wherein the second oxygen concentration variance calculating unit and the second to the oxygen concentration variance equation, obtained by using the equation, O 2 _bias2 is a second oxygen concentration variance, ΔO 2 (t) the time (t) is the change in oxygen concentration at the time, O 2 (t-1) is a time (t-1) oxygen concentration control of the oxygen concentration in the heating device at the time.
[Claim 6]
Step of receiving a measure of the CO off-gas; Determining whether the measured value is out of carbon monoxide carbon monoxide tolerance range; Obtaining a second variance oxygen concentration using the oxygen concentration measurement of the carbon monoxide measured and the exhaust gas; Comprising the steps of: providing by said carbon monoxide measurement is calculated for a first oxygen concentration and the oxygen concentration variate variate using the second oxygen concentration variance is set to fall outside of the allowed range of carbon monoxide, prior; If the carbon monoxide reading is beyond the allowable range of carbon monoxide, the method comprising: providing a first oxygen concentration by the oxygen concentration variate variate; And correcting the set point oxygen concentration using the oxygen concentration variance; Oxygen concentration control method of a furnace, comprising a.
[Claim 7]
The method of claim 6 wherein the step of obtaining the second oxygen concentration variance is calculating a moving average value for the measurement of carbon monoxide; Finding an amount of change of carbon monoxide using a moving average value of the measured carbon monoxide; Calculating the oxygen concentration change by using a moving average value, the oxygen concentration measured value and the change amount of the carbon monoxide carbon monoxide measurements; And calculating a second oxygen concentration variance using the oxygen concentration variation; Oxygen concentration control method of a furnace, comprising a.
[Claim 8]
The method of claim 7, further comprising calculating the moving average value is to a moving average value of said carbon monoxide measurement equation, obtained using, and the above equation, N is a natural number of 1 or more, t is the oxygen of the furnace of the time variable density control method.
[Claim 9]
The method of claim 7 wherein the step of obtaining the carbon monoxide change is to the carbon monoxide change equation, obtained by using the equation, COpv, avg (t-1) is carbon monoxide, measured at the point of time (t-1) a moving average value, COpv, avg (t) is the oxygen concentration control method of a furnace, a moving average value for the measured value of carbon monoxide at the point of time (t) for the.
[Claim 10]
The method of claim 7, wherein the step of calculating the oxygen concentration change is to the oxygen concentration change in expression, obtained using the equation, ΔO 2 (t) is the oxygen concentration variation, A is a sensitivity factor, it does 2 pv, avg is the measure of oxygen concentration moving average differential value, dCOpv, avg is a change amount, and B is for adjusting an oxygen concentration control of a heating offset of the differential value, the carbon monoxide measurements ΔCO (t) of the moving average of the carbon monoxide measurements Way.
[Claim 11]
The method of claim 7, wherein calculating the second oxygen concentration variance is the second to the oxygen concentration variance equation, obtained by using the equation, O 2 _bias2 is a second oxygen concentration variance, ΔO 2 (t) is the time (t) is the change in oxygen concentration at the time, O 2 (t-1) is a time (t-1) method of controlling the oxygen concentration with the oxygen concentration in the heating time.