DESC:‘A SWIVEL ASSEMBLY FOR BURNER TIPS IN PULVERIZED COAL FIRED BOILERS IN THERMAL POWER PLANT’

FIELD OF THE INVENTION:

[001] The present invention relates to a Swivel assembly for burner tips in pulverized coal fired boilers in thermal power plant, which involves horizontal swivel mechanism.

[002] Stringent emission norms are being deployed across the globe to restrict the SOx and NOx pollutants. Main source of these pollutants is the thermal power generating units apart from the automotive engines. To reduce the pollutants lot of methods are commercially available in relation to amount of reduction to price. Most cost economical method is to reduce or restrict them from formation rather than separation and containment after formation, if possible. Restricting of NOx formation is tried by several methods like air staging, fuel stating, combination, etc. To perform such thing in thermal power plant boilers windbox is designed. To further enhance the effectiveness of air staging process, air nozzle tilts horizontally and vertically. The prevailing Current/present invention is to provide the optimized mechanism to enable the combustion air nozzles to swivel horizontally inside the windbox. In boilers air admits into the furnace through windbox via nozzles. To complete combustion of fuel entered in to boiler furnace, required proportion of the air to be made is available. For this purpose auxiliary air nozzle is deployed as part of windbox. This will enable the combustion air penetrating in to the furnace to improve the combustion and reduce the NOx formation during the combustion process. This swivel mechanism is fitted with air nozzles to enable the rotating motion horizontally in the windbox. This swivel mechanism enables the air nozzles to rotate some fixed degrees.

BACKGROUND OF THE INVENTION/PRIOR ART:

[003] Background description includes information that may be useful in understanding the present invention. It is not an admission that any of the information provided herein is prior art or relevant to the presently claimed invention, or that any publication specifically or implicitly referenced is prior art.

[004] In the context of newly introduced stringent emission norms for the coal fired power plants, combustion optimization becomes very critical and cost effective tool to contain the pollution emissions apart from other benefits like reducing the water wall corrosion, low unburnt in ash, help in attaining optimum performance of the power station. In pulverized coal fired utility boilers, mixture of pulverised coal and primary air from mills are transferred through steel pipes. For complete combustion of coal it is necessary to admit optimum amount of air. Apart from primary air carrying the coal, rest of the air will be supplied through windbox or burner assembly to complete the combustion. The air admitting through windbox is secondary air also called auxiliary air. To perform the optimized combustion and to reduce the NOx formation inside the combustion chamber is very complex phenomenon. To execute such a process, it is necessary to admit the secondary air into furnace near the fuel at various locations based on geometry and dynamics of the combustion process. Mainly tilting nozzles are used to perform the same. This tilting is done by-axially using different mechanisms. This invention of swivel mechanism is used to do the tilting process horizontally in the air nozzles.

[005] Purpose of the swiveling the air nozzles is to distribute the combustion air inside the furnace uniformly to burn the fuel to reduce the NOx. Swiveling of the nozzles is done manually. Coal is heterogeneous structure and its chemical behavior is based on its formation process and its composition. Different locations coals have different chemical composition and also having different combustion behavior. Hence these variables change the combustion dynamics continuously in power plants based on the availability of different sources of coals. To address the issues related to different sources of coals for better combustion with reduced pollutants like NOx, it’s always necessary to have certain tools in boiler operators. Conventional boilers have tilting arrangement to address the air staging to some extent but not so satisfactory. Swiveling of nozzle tips is being thought of to aid in addressing the problems like reduction of NOx in boilers to a good extent. This invention is to help in introducing the swiveling nozzle tips to accommodate the tilting provision.

PRIOR ART:

[006] Reference may be made to below prior arts:

[007] US patent US2019046173: The invention is erected to a tool having a wrist mechanism that provides pitch and yaw rotation in such a way that the tool has no singularity in roll, pitch, and yaw. A positively positionable multi-disk wrist mechanism includes a plurality of disks or vertebrae stacked in series. Each vertebra is configured to rotate in pitch or in yaw with respect to each neighboring vertebra. Actuation cables are used to manipulate and control movement of the vertebrae. In specific embodiments, some of the cables are distal cables that extend from a proximal vertebra through one or more intermediate vertebrae to a distal vertebra, while the remaining cables are medial cables that extend from the proximal vertebra to one or more of the intermediate vertebrae. The cables are actuated by a pivoted plate cable actuator mechanism. This multi disk mechanism is different from the current invention.

[008] A patent on Horizontal oscillating mechanism of nozzle of fountain is CN2523516Y. The utility model provides a horizontal oscillating mechanism of a nozzle of a fountain machine and consists of a connecting pipe connected with the nozzle, a rotator connected with the connecting pipe, a water delivery core pipe which is connected with a water delivery pipe of the fountain machine has a water outlet arranged on the pipe wall of the core pipe, a connecting rod and a dynamic rod lock connected with the connecting rod. The rotator is arranged on the water delivery core pipe, and can be repeatedly rotated around the water delivery core pipe. A cavity of the rotator is communicated with a pipe cavity of the water delivery core pipe by the water outlet of the water delivery core pipe. This current invention is very different from the patent claimed for mechanism used in water pipe application. The current/present invention is in the field of coal fired thermal power plants.

[009] The invention with patent CN101324219B relates to a wind-driven generator, in particular to a yaw mechanism used on the wind-driven generator. The technical proposal provided by the invention is that annular pivoting supports which are mutually connected into a whole are arranged above an annular brake disc, the periphery of the pivoting supports is provided with teeth, and the invention is characterized in that: a reducer is arranged outside the pivoting supports, electric motors which are interconnected are arranged above the reducer, a yaw transmission gear of the reducer is meshed with the teeth on the pivoting supports, the axis of the yaw transmission gear is parallel to the center line of the pivoting supports; a plurality of bolts are arranged at the inner edge of the pivoting supports along the circumference direction of the pivoting supports, the axis of the bolts is also parallel to the center line of the pivoting supports; a train limit switch and a position transducer are further arranged outside the pivoting supports, a gear interconnected with the train limit switch is meshed with the teeth on the pivoting supports.

[0010] Another yawing mechanism patent CN101558234B is directed to a yawing system for a wind turbine. A yawing system for a wind turbine comprising a tower construction and a nacelle. The yawing system comprises a stationary part being connectable to or forming part of a tower construction of a wind turbine, and a rotating part being connectable to a nacelle of a wind turbine. The rotating part is arranged adjacent to the stationary part in such a manner that the rotating part is allowed to rotate relatively to the stationary part via a gear connection between the stationary part and the rotating part. The rotating part comprises a plurality of modules, each comprising a sub-module, the sub-modules being at least substantially identical in size and shape. Each module is configurable to perform various functions, e.g. by positioning one or more function defining elements in the corresponding sub-module. Thereby a configured module belongs to a category of modules reflecting the function of the configured module. At least one of the modules is configured as a drive module adapted to drive a rotational movement of the rotational part relatively to the stationary part, via the gear connection. Due to the similarity in size and shape of the sub-modules, a module belonging to a category may be replaced or reconfigured to belong to a different category of modules without altering the main design of the rotating part.

[0011] During search, associated with yawing mechanisms, yaw vectoring for exhaust nozzle in air crafts have patent of CN1766300A. A nozzle assembly providing an air flow to give thrust to the main exhaust gas flow to increase exhaust gas mobility of the aircraft. The exhaust nozzle assembly includes a cooling air passage that can supply cooling air to a plurality of cooling holes thereby creating an air insulating layer. It can be a guide groove in a direction orthogonal to the main exhaust stream flow of cooling air injected into the exhaust passage. A cover plate portion can block the flow of cooling air leading to the exhaust passage in the guide groove, so that the guide portion of the main exhaust gas stream.

[0012] Above all the patents are different field in application and method used also varies due to the construction of the mechanism and requirement of sensitivity. Whereas the current invention is applicable for use in in the field of coal fired thermal power plants due to its simplicity in construction and use in very harsh environment.

OBJECTS OF THE INVENTION:

[0013] Main objective of the invention is to provide a smooth operating mechanism to establish a horizontal swivel motion of air nozzle tips in the windboxes for thermal power plants boiler.

[0014] Another object of the invention is to provide a Swivel assembly for burner tips in pulverized coal fired boilers in thermal power plant, which serves the purpose efficiently.

[0015] These and other objects and advantages of the present invention will be apparent to those skilled in the art after a consideration of the following detailed description taken in conjunction with the accompanying drawings in which a preferred form of the present invention is illustrated.

SUMMARY OF THE INVENTION:
[0016] One or more drawbacks of conventional systems and process are overcome, and additional advantages are provided through the apparatus/composition and a method as claimed in the present disclosure. Additional features and advantages are realized through the technicalities of the present disclosure. Other embodiments and aspects of the disclosure are described in detail herein and are considered to be part of the claimed disclosure.

[0017] In general coal fired boilers wind boxes have tilting nozzles vertically.
[0018] In addition to the vertical tilting motion, horizontal rotational motion to the air nozzles helps in controlling the combustion and reducing the pollutant emissions forming during combustion process.

[0019] According to the invention, there is provided a swivel assembly for burner tips in pulverized coal fired boilers in thermal power plant.

[0020] This invention is about yawing of air nozzle tips for pushing air horizontally into the furnace to a specified angles by using a swivel mechanism in thermal power plants and so. This swivel assembly produces rotary motion of the operating drive lever in to translation and rotational motions of the clevis link assembly. Clevis link is connected to stationary air nozzles to be rotated. Horizontal swivel assembly allows the air nozzles tilt horizontally within the wind box. Also this invention allows the vertical nozzle tilt during horizontal rotation smoothly.

[0021] Various objects, features, aspects, and advantages of the inventive subject matter will become more apparent from the following detailed description of preferred embodiments, along with the accompanying drawing figures in which like numerals represent like components.

[0022] It is to be understood that the aspects and embodiments of the disclosure described above may be used in any combination with each other. Several of the aspects and embodiments may be combined to form a further embodiment of the disclosure.

[0023] The foregoing summary is illustrative only and is not intended to be in any way limiting. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features will become apparent by reference to the drawings and the following detailed description.

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS:
[0024] The illustrated embodiments of the subject matter will be best understood by reference to the drawings, wherein like parts are designated by like numerals throughout. The following description is intended only by way of example, and simply illustrates certain selected embodiments of devices, systems, and processes that are consistent with the subject matter as claimed herein, wherein:

[0025] Figure 1 shows: Exploded view of a Swivel assembly for burner nozzles in thermal power plant according to the present invention.

[0026] Figure 2 shows: Isometric view of A Swivel assembly for burner nozzles in thermal power plant of the invention.

[0027] The figures depict embodiments of the disclosure for purposes of illustration only. One skilled in the art will readily recognize from the following description that alternative embodiments of the structures and methods illustrated herein may be employed without departing from the principles of the disclosure described herein.

DETAILED DESCRIPTION OF THE EXAMPLARY EMBODIMENT OF THE INVENTION WITH REFERENCE TO THE ACCOMPANYING DRAWINGS:

[0028] While the embodiments of the disclosure are subject to various modifications and alternative forms, specific embodiment thereof have been shown by way of example in the figures and will be described below. It should be understood, however, that it is not intended to limit the disclosure to the particular forms disclosed, but on the contrary, the disclosure is to cover all modifications, equivalents, and alternative falling within the scope of the disclosure.

[0029] The present invention makes a disclosure regarding a Swivel assembly for burner nozzles in thermal power plant.

[0030] The Present invention is about yawing of air nozzle tips for pushing air horizontally into the furnace to a specified angles by using a swivel mechanism in thermal power plants and so. Swivel assembly as illustrated in the Figs. 01 and 02 is used for establishing the horizontal rotation motion of the air nozzle tips.

[0031] This swivel assembly is to be anchored with wind box firmly at front side.

[0032] This swivel assembly comprises of operating leaver assembly (1) bolted to one end of drive shaft (3) with drive lever nut (2). Swivel block bottom (5) is mounted to other end of the drive shaft (3) tightly. Turning sphere (8) is positioned in the spherical grooves provided on swivel bottom (5) and top blocks (6). This turning sphere spins in the spiral groove to allow to rotate the clevis link along with sleeve. Turning sphere is having an attached lever with it as shown in the fig 1. Spin of the sphere produces three directional rotations to help smooth operation of the tilting and yawing of the air nozzles simultaneously. Excessive rotational movements of the sphere are restrained by using restricted circular opening formed between the bottom and top swivel blocks. Swiveling blocks bottom and top (5,6) are fixed by using mounting plates (7), bolts (12) and nuts (11) as illustrated in figs. 1 and 2.

[0033] While drive lever assembly is fitted with graduated protractor to identify the position and orientation of the clevis link assembly (9). This clevis link assembly (9) is connected to the air nozzles to be rotated horizontally.

[0034] A swivel assembly with circular shape drive leaver (1) is used for producing rotary movement to translation motion for yawing tips in coal firing boilers.
There is use of spherical motion of swiveling sphere (8) to linear motion of clevis link assembly (9) in achieving horizontal motion for yawing tips in coal-fired power plants.

[0035] There is use of anchored drive shaft (3) method with air ducts, wind boxes or any over fire compartments in coal fired power plants.

WORKING OF THE INVENTION:
[0036] The Drive lever assembly is having wing nut provision to fix the position of the clevis link [9] firmly. The Clevis link [9] will be allowed to rotate vertically with respect to sleeve. Rotating motion of the drive lever will be transferred to clevis link [9] via drive shaft [3], clevis block bottom, turning sphere [8] and the sleeve. Turning sphere will be rotating within the two swivel blocks [5, 6]. The rotation of drive lever will be translated to linear motion by the swiveling blocks [5,6]. Same will drive the main clevis link assembly [9] through turning sphere [8] and sleeve assembly. This will help in attaining the rotation motion and linear motion together to establish the smooth operation of horizontal swivel assembly.

ADVANTAGES OF THE INVENTION:

[0037] Main advantage of the invention is to allow operator to produce any arbitrary yaw angle and to lock the position without any trouble. The invention provides quick and effort less operation of the nozzles. The handle provides more grip during the operation than any other systems.

[0038] Each of the appended claims defines a separate invention, which for infringement purposes is recognized as including equivalents to the various elements or limitations specified in the claims. Depending on the context, all references below to the "invention" may in some cases refer to certain specific embodiments only. In other cases, it will be recognized that references to the "invention" will refer to subject matter recited in one or more, but not necessarily all, of the claims.

[0039] Groupings of alternative elements or embodiments of the invention disclosed herein are not to be construed as limitations. Each group member can be referred to and claimed individually or in any combination with other members of the group or other elements found herein. One or more members of a group can be included in, or deleted from, a group for reasons of convenience and/or patentability. When any such inclusion or deletion occurs, the specification is herein deemed to contain the group as modified thus fulfilling the written description of all groups used in the appended claims.

[0040] It will be understood by those within the art that, in general, terms used herein, and especially in the appended claims (e.g., bodies of the appended claims) are generally intended as “open” terms (e.g., the term “including” should be interpreted as “including but not limited to,” the term “having” should be interpreted as “having at least,” the term “includes” should be interpreted as “includes but is not limited to,” etc.). It will be further understood by those within the art that if a specific number of an introduced claim recitation is intended, such an intent will be explicitly recited in the claim, and in the absence of such recitation no such intent is present. For example, as an aid to understanding, the following appended claims may contain usage of the introductory phrases “at least one” and “one or more” to introduce claim recitations. However, the use of such phrases should not be construed to imply that the introduction of a claim recitation by the indefinite articles “a” or “an” limits any particulars claim containing such introduced claim recitation to inventions containing only one such recitation, even when the same claim includes the introductory phrases “one or more” or “at least one” and indefinite articles such as “a” or “an” (e.g., “a” and/or “an” should typically be interpreted to mean “at least one” or “one or more”); the same holds true for the use of definite articles used to introduce claim recitations. In addition, even if a specific number of an introduced claim recitation is explicitly recited, those skilled in the art will recognize that such recitation should typically be interpreted to mean at least the recited number (e.g., the bare recitation of “two recitations,” without other modifiers, typically means at least two recitations, or two or more recitations). Furthermore, in those instances where a convention analogues to “at least one of A, B and C, etc.” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., “a system having at least one of A, B and C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). In those instances where a convention analogous to “at least one of A, B, or C, etc.” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., “a system having at least one of A, B, or C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). It will be further understood by those within the art that virtually any disjunctive word and/or phrase presenting two or more alternative terms, whether in the description, claims, or drawings, should be understood to contemplate the possibilities of including one of the terms, either of the terms, or both terms. For example, the phrase “A or B” will be understood to include the possibilities of “A” or “B” or “A and B”.

[0041] The above description does not provide specific details of manufacture or design of the various components. Those of skill in the art are familiar with such details, and unless departures from those techniques are set out, techniques, known, related art or later developed designs and materials should be employed. Those in the art are capable of choosing suitable manufacturing and design details.

[0042] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure. It will be appreciated that several of the above-disclosed and other features and functions, or alternatives thereof, may be combined into other systems or applications. Various presently unforeseen or unanticipated alternatives, modifications, variations, or improvements therein may subsequently be made by those skilled in the art without departing from the scope of the present disclosure as encompassed by the following claims.

[0043] The claims, as originally presented and as they may be amended, encompass variations, alternatives, modifications, improvements, equivalents, and substantial equivalents of the embodiments and teachings disclosed herein, including those that are presently unforeseen or unappreciated, and that, for example, may arise from applicants/patentees and others.

[0044] While various aspects and embodiments have been disclosed herein, other aspects and embodiments will be apparent to those skilled in the art. The various aspects and embodiments disclosed herein are for purposes of illustration and are not intended to be limiting, with the true scope and spirit being indicated by the following claims.
,CLAIMS:WE CLAIM:

1. A Swivel assembly for burner nozzles in thermal power plant comprising of operating leaver assembly [1] fastened to one end of drive shaft [3] with drive lever nut [2] and Swivel block bottom [5] is mounted to other end of the drive shaft [3], wherein Turning sphere [8] is positioned in the spherical grooves provided on said swivel bottom [5] and top blocks [6].

2. The Swivel assembly as claimed in claim 1, wherein the turning sphere [8] spins in the spiral groove to allow to rotate the clevis link [9] along with sleeve and the turning sphere is having an attached lever with it, wherein Spin of the sphere produces the directional rotations for smooth operation of the tilting and yawing of the air nozzles simultaneously.

3. The Swivel assembly as claimed in claim 1, wherein the Excessive rotational movements of the sphere [8] are restrained by restricted circular opening formed between the bottom and top swivel blocks [5, 6].

4. The Swivel assembly as claimed in claim 3, wherein the Swivelling blocks bottom and top [5, 6] are fixed by mounting plates [7], bolts [12] and nuts [11].

5. The Swivel assembly as claimed in claims 1-4, wherein drive lever assembly is fitted with graduated protractor to identify the position and orientation of the clevis link assembly (9), which is connected to the air nozzles to be rotated horizontally.

6. The Swivel assembly as claimed in claims 1-5, wherein the swivel assembly is to be anchored with wind box at front side.