CN216203479U - Million double tangential circle boiler and uniform air distribution device for boiler air duct - Google Patents
Million double tangential circle boiler and uniform air distribution device for boiler air duct Download PDFInfo
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- CN216203479U CN216203479U CN202120631823.XU CN202120631823U CN216203479U CN 216203479 U CN216203479 U CN 216203479U CN 202120631823 U CN202120631823 U CN 202120631823U CN 216203479 U CN216203479 U CN 216203479U
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Abstract
The utility model provides a million double tangential circle boiler and a uniform air distribution device for an air duct of the boiler, comprising: the air quantity uniform distribution component is arranged at the air duct of the boiler and is used for uniformly distributing the air flow in the secondary air duct of the front wall and the rear wall of the hearth and the air flow in the air duct of the over-fire air corner air box of the front wall and the rear wall of the hearth; the mode of air door differentiation adjustment is not needed, the effect of uniform air distribution of the secondary air duct of the boiler is achieved, the workload of operators is reduced, and the throttling loss of the air door is reduced.
Description
Technical Field
The utility model relates to a million double-tangential-circle boiler, in particular to a million double-tangential-circle boiler and a uniform air distribution device for an air duct of the boiler.
Background
The cold secondary air of the double-tangential-circle boiler of the million units is heated by the air preheater to form hot secondary air, and the hot secondary air enters the hearth from the direction of the rear wall of the hearth through the secondary air box system to participate in pulverized coal combustion. The original structural design of the hot secondary air duct of the double-tangential boiler and the secondary air boxes of the front wall and the rear wall has defects, so that the resistance deviation of the hot secondary air duct of the front wall and the rear wall is very large, and the air inlet amount of secondary air at each corner inlet of the front wall, the rear wall and the air boxes of the hearth has obvious deviation.
The conventional technical scheme is that secondary air adjusting doors are additionally arranged at inlets of corner air boxes, the method has a certain effect on adjusting the secondary air quantity deviation of front and rear walls, and the defects of the method are very prominent. Firstly, under most working conditions, even if the opening degree of the rear wall secondary air door is very small, and meanwhile, when the front wall secondary air door is fully opened, the air quantity of the rear wall is still obviously larger than that of the front wall, and particularly, the phenomenon is more prominent under low load; secondly, in the variable load process of the unit, the secondary air door at the inlet of the air box is adjusted obviously and lags behind, so that the secondary air quantity deviation of the front wall and the rear wall is very large under most operation working conditions of the unit, the air distribution uniformity of the boiler is poor, and the combustion working condition is severe; thirdly, the secondary air door at the inlet of the air box is used for adjustment, the air door is reduced to cause throttling loss, the resistance of a secondary air channel is increased, and the operation mode is not energy-saving.
Due to the limitation of arrangement space, the original structure of the secondary air system of the domestic 1000MW double-tangential boiler has defects in design, the resistance of the secondary air duct at the back of the boiler is far smaller than that of the front wall, the air inlet quantity of the secondary air duct at the back wall of the hearth is far larger than that of the front wall of the hearth, and the secondary air quantity at the front wall and the back wall of the hearth has obvious deviation. The common solution of domestic power plants to the problem is to install a secondary air adjusting door at the entrance of a large air door, and the defects are that after the air door is adjusted in a differentiated mode, the air quantity of the rear wall of a hearth is still obviously larger than that of the front wall of the hearth, particularly, the phenomenon is more prominent in the case of low load, in the process of changing the load of a unit, the secondary air door at the entrance of an air box is adjusted obviously and lags behind, under most of operation conditions, the secondary air quantity deviation of the front wall and the rear wall is very large, the air distribution uniformity of a boiler is poor, and the combustion condition is severe.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problems, the utility model provides a million double tangential circle boiler and a uniform air distribution device for an air duct of the boiler, which do not need to adopt a mode of air door differentiation adjustment, achieve the effect of uniform air distribution of a secondary air duct of the boiler, reduce the workload of operators and reduce the throttling loss of the air doors.
In order to achieve the purpose, the technical scheme of the utility model is as follows:
a boiler air duct uniform air distribution device comprises: the air quantity uniform distribution component is arranged at the position of an air duct of the boiler and used for uniformly distributing the air flow in the secondary air duct of the front wall and the rear wall of the hearth and the air flow in the over-fire air corner air box air duct of the front wall and the rear wall of the hearth.
The utility model provides a million double tangential circle boiler and a uniform air distribution device for an air duct of the boiler, which can achieve the effect of uniform air distribution of a secondary air duct of the boiler without adopting a mode of air door differential adjustment, reduce the workload of operators and reduce the throttling loss of the air doors.
As a preferred technical scheme, the air volume uniform distribution assembly comprises: and the airflow distributor is arranged at a tee joint position of the secondary air duct of the rear wall of the hearth and is used for reducing the resistance of the secondary air duct of the front wall of the hearth.
Preferably, the air flow distributor is composed of at least three sets of air flow distributor blades.
As a preferred technical scheme, the air volume uniform distribution assembly comprises: the throttling element is arranged at the first corner air box air channel of the over-fire air of the front wall of the hearth and used for increasing the resistance of the first corner air box air channel of the over-fire air of the front wall of the hearth.
As a preferred technical scheme, the throttling element is a porous plate, and the aperture ratio of the porous plate is inversely proportional to the pressure difference between the first angular air box and the second angular air box of the over-fire air of the front wall of the hearth.
As a preferred technical scheme, the air volume uniform distribution assembly comprises: the guide plate is arranged at the position of the air duct of the second corner air box of the over-fire air of the front wall of the hearth and is used for reducing the resistance of the air duct of the second corner air box of the over-fire air of the front wall of the hearth.
As a preferred technical scheme, the guide plate is composed of at least two groups of arc-shaped flow guide assemblies.
As a preferred technical scheme, the air volume uniform distribution assembly comprises: the guide plate group is arranged at the air duct of the secondary air duct steering elbow of the front wall of the hearth and is used for reducing the resistance of the secondary air duct of the front wall of the hearth.
As a preferred technical scheme, the guide plate group is composed of a plurality of elbow guide plates.
A million double tangential circle boiler, comprising: boiler air duct and a uniform air distribution device for a boiler air duct according to any one of the preceding claims, the boiler air duct comprising: the boiler air duct uniform air distribution device is arranged at the secondary air duct of the front and rear walls of the hearth and at the over-fire air angle air box air duct of the front and rear walls of the hearth.
The utility model provides a million double tangential circle boiler and a uniform air distribution device for an air duct of the boiler, which have the following beneficial effects:
1) the utility model provides a million double tangential circle boiler and a uniform air distribution device for an air duct of the boiler, which can realize uniform air distribution of secondary air in the full-load dynamic adjustment process of the boiler and realize automatic uniform air distribution of the boiler from the source. The air box inlet secondary air door differential adjustment is not needed, the unit equipment investment is saved, and the throttling loss of the air door is avoided;
2) the utility model provides a million double tangential circle boiler and a uniform air distribution device for boiler air channels, wherein after the air quantity of secondary air channels on the front wall and the rear wall of a hearth is basically leveled, a local combustion deterioration area of the hearth is eliminated, the uniformity of the heat load of the whole hearth is improved, particularly the uniformity under low load is improved, a foundation is laid for well organizing the combustion working condition of the boiler, the risk of high-temperature corrosion of the boiler is effectively reduced, the air temperature deviation on two sides of the boiler is reduced, a foundation is provided for the good dynamic air temperature regulation characteristic of the boiler, and the safe, economical and stable operation of the boiler is ensured;
3) the utility model provides a million double-tangential-circle boiler and a uniform air distribution device for an air duct of the boiler, wherein a water-cooled wall of the 1000MW double-tangential-circle boiler is a vertical water-cooled wall, and the requirement on the uniformity of the heat load of a hearth is higher. After the secondary air quantity of the front wall and the rear wall and the burnout air quantity of each corner are leveled, the thermal load uniformity of the boiler furnace is obviously improved, the temperature distribution uniformity of the water-cooled wall of the furnace can be effectively improved, the overtemperature frequency and the amplitude of the water-cooled wall are reduced, and the overtemperature condition of the wall is greatly improved;
4) the utility model provides a million double tangential circle boiler and a uniform air distribution device for boiler air ducts, wherein after the air quantity of secondary air ducts on the front wall and the rear wall of a hearth and the air quantity of an air box air duct at a burnout air angle of the front wall and the rear wall of the hearth are leveled, the air distribution uniformity of the boiler is greatly improved, the severe combustion area of the boiler is eliminated, the concentration of CO generated by incomplete combustion of the boiler is greatly reduced, the content of combustible substances of boiler ash is reduced, and the thermal efficiency of the boiler is effectively improved;
5) the utility model provides a million double tangential circle boiler and a uniform air distribution device for an air duct of the boiler, which can obviously improve the uniformity of the heat load of a hearth after uniform air distribution of the boiler, effectively reduce the concentration of NOx generated by combustion, improve the uniformity of air distribution of over-fire air, and effectively improve the reducibility of the over-fire air, thereby reducing the concentration of NOx at an outlet of the boiler.
Drawings
FIG. 1 is a structural diagram of a uniform air distribution device for a boiler air duct according to the present invention;
FIG. 2 is a structural diagram of a uniform air distribution device for a boiler air duct according to the present invention;
FIG. 3 is an enlarged structure diagram of a partial area of a uniform air distribution device for a boiler air duct according to the present invention;
FIG. 4 is an enlarged structure diagram of a partial area of the uniform air distribution device for the boiler air duct according to the present invention;
FIG. 5 is an enlarged structure view of a partial region of the uniform air distribution device for the boiler air duct according to the present invention;
FIG. 6 is an enlarged structure diagram of a partial area of the uniform air distribution device for the boiler air duct according to the present invention;
FIG. 7 is an enlarged structure view of a partial region of a uniform air distribution device for a boiler air duct according to the present invention;
FIG. 8 is an enlarged structure view of a partial region of a uniform air distribution device for a boiler air duct according to the present invention;
FIG. 9 is an enlarged structure view of a partial region of the uniform air distribution device for the boiler air duct according to the present invention;
FIG. 10 is an enlarged structure view of a partial region of a uniform air distribution device for a boiler air duct according to the present invention;
FIG. 11 is an enlarged structure view of a partial region of the uniform air distribution device for the boiler air duct according to the present invention;
wherein: 1-a gas flow distributor; 11-first air flow distributor vanes; 12-a second air flow distributor vane; 13-third airflow distributor vanes; 2-a throttle member; 3-a guide plate; 31-guide plate blades; 32-guide plate blades; 4-a flow guide plate group; 41-a flow guide plate group; 42-flow guide plate group; 43-a flow guide plate group; 44-a flow guide plate group; 45-guide plate group; 46-a flow guide plate group; 5-secondary air boxes in the main combustion area of the front wall of the hearth; 6-first corner air box of over-fire air of the front wall of the hearth, 7-second corner air box of over-fire air of the front wall of the hearth, and 8-secondary air box of a main combustion area of the rear wall of the hearth; 9-a first corner air box of over-fire air of a hearth rear wall, 10-a second corner air box of over-fire air of the hearth rear wall and 11-a boiler body.
Detailed Description
The preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings
In order to achieve the purpose of the present invention, in the embodiment, a million double tangential circle boiler and an air duct uniform air distribution device of the boiler are provided, air quantity uniform distribution assemblies 1, 2, 3, and 4 are arranged at secondary air ducts of front and rear walls of a furnace and air ducts of each burn-out air corner bellows of the boiler, the air quantity uniform distribution assemblies 1, 2, 3, and 4 adopt the cooperation of an air flow distributor 1, a throttling member 2, a guide plate 3, and a guide plate group 4, so that the flow of the secondary air duct is optimized, the air duct resistance of the front wall of the furnace is reduced, the air duct resistance of the rear wall of the furnace is increased, the deviation of the air intake of each corner bellows of the front and rear walls of the furnace is obviously reduced, and the effect of uniform air distribution of the secondary air ducts of the boiler is achieved from the source. The secondary air adjusting door at the inlet of the air box is eliminated, the mode of air door differential adjustment is not needed, the workload of operators is reduced, and the throttling loss of the air door is reduced.
As shown in fig. 1, a boiler comprises: a boiler body 11, wherein the boiler body 11 is provided with a primary combustion area secondary air box 5 of a front wall of a hearth and a primary combustion area secondary air box 8 of a rear wall of the hearth, the primary combustion area secondary air box 5 of the front wall of the hearth and the primary combustion area secondary air box 8 of the rear wall of the hearth are arranged oppositely, a first corner bellows 6 of the burnout air of the front wall of the hearth and a second corner bellows 7 of the burnout air of the front wall of the hearth are respectively arranged at the two sides of the secondary bellows 5 of the front main combustion area of the boiler, the two sides of the secondary air box 8 of the main burning area of the hearth rear wall are respectively provided with a first corner air box 9 of the over-fire air of the hearth rear wall and a second corner air box 10 of the over-fire air of the hearth rear wall, the throttling piece 2 is arranged at the horizontal section of the air channel of the first corner air box 6 of the over-fire air of the hearth front wall, the throttling piece 2 adds the air channel resistance of the first corner air box 6 of the over-fire air of the hearth front wall, the airflow flowing resistance of the air channel of the first corner air box 6 of the over-fire air of the hearth front wall is properly increased, and therefore the air intake of the first corner air box 6 of the over-fire air of the hearth front wall is reduced. The guide plate 3 is arranged at the air channel of the second corner air box 7 of the over-fire air of the front wall of the hearth, and the guide plate 3 is used for subtracting the air channel resistance of the second corner air box 7 of the over-fire air of the front wall of the hearth, guiding the secondary air channel air quantity of the front wall of the hearth into the second corner air box 7 of the over-fire air of the front wall of the hearth, and increasing the air inlet quantity of the second corner air box 7 of the over-fire air of the front wall of the hearth.
As shown in fig. 2, aiming at the problem that the original structure of a domestic 1000MW double tangential boiler secondary air system has a defect in design, the resistance of a secondary air duct on the rear wall of a hearth is far less than the resistance of an air duct on the front wall of the hearth, so that the air intake of the secondary air duct on the rear wall of the hearth is far greater than the air intake of the secondary air duct on the front wall of the hearth, and the air intake of the secondary air duct on the front wall and the rear wall of the hearth has a significant deviation, the utility model provides a boiler air duct uniform air distribution device, wherein air duct positions of a boiler are provided with air volume uniform distribution components 1, 2, 3 and 4, the air volume uniform distribution components 1, 2, 3 and 4 are used for uniformly distributing the air flow in the secondary air duct on the front wall and the rear wall of the hearth and the air flow in air ducts of burned-out air corner air bellows 6, 7, 9 and 10 on the front wall and the rear wall of the hearth, and the air volume uniform distribution components comprise: the air flow distributor comprises an air flow distributor 1, a throttling piece 2, a guide plate 3 and a guide plate group 4.
The utility model provides a million double-tangential boiler and a uniform air distribution device for boiler air ducts, which can realize uniform distribution of secondary air duct flow of front and rear walls of a hearth and air duct flow of an air box at a burnout wind angle of each front and rear walls of the hearth, and ensure that the resistance of a secondary air duct system of the whole million double-tangential boiler is not increased or slightly increased.
As shown in fig. 4, the air flow distributor 1 is composed of three sets of air flow distributor blades 11, 12, 13, each two sets of air flow distributor blades are arranged oppositely, and the three sets of air flow distributor blades include: a first air flow divider vane 11, a second air flow divider vane 12 and a third air flow divider vane 13. The air flow distributor blades 11, 12 and 13 are preferably arc-shaped guide blades, the radian of each arc-shaped guide blade is 90 degrees, and the sizes and the distribution positions of the arc- shaped guide blades 11, 12 and 13 are optimally designed according to the structure and the shape of a three-way air flue of a rear wall secondary air flue of the boiler.
The air flow distributor 1 is arranged at a tee joint position of a secondary air duct of a rear wall of the boiler, the air flow distributor 1 is used for reducing the resistance of the secondary air duct of the front wall of the hearth, and has the functions of subtracting the resistance of the secondary air duct of the front wall of the hearth, so that the resistance of the secondary air duct of the front wall of the hearth is reduced as much as possible, the secondary air pressure of the front wall of the hearth is improved, more secondary air quantity is guided to the direction of the front wall of the hearth, the secondary air quantity of the front wall of the hearth is increased, and the secondary air flow deviation of the front wall and the rear wall of the hearth is reduced.
As shown in figure 3, the throttling element 2 is preferably a porous plate, the opening rate and the opening form of the porous plate are determined according to the air duct pressure difference of the first corner air box 6 of the hearth front wall over-fire air and the second corner air box 7 of the hearth front wall over-fire air, and the opening rate of the porous plate is inversely proportional to the pressure difference of the first corner air box 6 and the second corner air box 7 of the hearth front wall over-fire air. The throttling element 2 is arranged at the horizontal section air duct of the first corner air box 6 of the over-fire air of the front wall of the hearth, the throttling element 2 is used for increasing the resistance of the first corner air box 6 of the over-fire air of the front wall of the hearth, the throttling element 2 is used for adding the resistance of the first corner air box 6 of the over-fire air of the front wall of the hearth, and the airflow flowing resistance of the first corner air box 6 of the over-fire air of the front wall of the hearth is properly increased, so that the air intake of the first corner air box 6 of the over-fire air of the front wall of the hearth is reduced.
As shown in fig. 5, the guide plate 3 is preferably an airflow guide plate, the guide plate 3 is composed of two sets of arc guide vanes 31 and 32, each two sets of arc guide vanes 31 and 32 are oppositely arranged, the radian of the two sets of arc guide vanes 31 and 32 is 90 °, the size and the distribution position of the two sets of arc guide vanes 31 and 32 are determined according to the arrangement form of the air duct of the second corner air box 7 of the front wall of the hearth, the guide plate 3 is arranged at the air duct of the second corner air box 7 of the front wall of the hearth, the guide plate 3 is used for reducing the resistance of the air duct of the second corner air box 7 of the front wall of the hearth, and the function of the guide plate is to subtract the air duct of the second corner air box 7 of the front wall of the hearth, guide the air volume of the secondary air duct of the front wall of the hearth to the second corner air box 7 of the front wall of the hearth, and increase the air intake volume of the second corner air box 7 of the front wall of the hearth;
as shown in fig. 6 to 11, at least six groups of guide plates 41, 42, 43, 44, 45, 46 are provided on the secondary air duct, each group of guide plate groups 41, 42, 43, 44, 45, 46 is provided at each main turning elbow of the secondary air duct of the front wall of the furnace, and the elbow guide plate groups 41, 42, 43, 44, 45, 46 are used for reducing the resistance of the secondary air duct of the front wall of the furnace. The elbow guide plate groups 41, 42, 43, 44, 45 and 46 are used for further subtracting the resistance of the secondary air duct of the front wall of the hearth, reducing the loss of the resistance of the secondary air duct of the front wall of the hearth along the way and further increasing the secondary air volume of the front wall of the hearth.
The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, many variations and modifications can be made without departing from the inventive concept of the present invention, which falls into the protection scope of the present invention.
Claims (10)
1. The utility model provides a boiler wind channel is air distribution device evenly which characterized in that includes: air quantity evenly distributed subassembly (1, 2, 3, 4), air quantity evenly distributed subassembly (1, 2, 3, 4) sets up in boiler wind channel department, air quantity evenly distributed subassembly is used for the evenly distributed to the interior wind flow of wall secondary air duct around the furnace and the interior wind flow of wall after-burning wind angle bellows (6, 7, 9, 10) wind channel around the furnace.
2. The boiler air duct uniform air distribution device according to claim 1, characterized in that the air volume uniform air distribution assembly (1, 2, 3, 4) comprises: the air flow distributor (1) is arranged at a tee joint position of the secondary air duct of the rear wall of the hearth, and the air flow distributor (1) is used for reducing the resistance of the secondary air duct of the front wall of the hearth.
3. The boiler air duct uniform air distribution device according to claim 2, characterized in that the air flow distributor (1) is composed of at least three sets of air flow distributor blades (11, 12, 13).
4. The boiler air duct uniform air distribution device according to claim 1, characterized in that the air volume uniform air distribution assembly (1, 2, 3, 4) comprises: the structure comprises a throttling piece (2), wherein the throttling piece (2) is arranged at an air channel of a first corner air box (6) of the wall over-fire air of the front furnace, and the throttling piece (2) is used for increasing the resistance of the air channel of the first corner air box (6) of the wall over-fire air of the front furnace.
5. The boiler air duct uniform air distribution device according to claim 4, characterized in that the throttling element (2) is a porous plate, and the aperture ratio of the porous plate is inversely proportional to the pressure difference between the first corner wind box (6) and the second corner wind box (7) of the burnout air of the front wall of the hearth.
6. The boiler air duct uniform air distribution device according to claim 1, characterized in that the air volume uniform air distribution assembly (1, 2, 3, 4) comprises: the guide plate (3), guide plate (3) set up in furnace front wall after-fire air second angle bellows (7) wind channel department, guide plate (3) are used for reducing the resistance in furnace front wall after-fire air second angle bellows (7) wind channel.
7. The boiler air duct uniform air distribution device according to claim 6, characterized in that the guide plate (3) is composed of at least two sets of arc-shaped guide plate blades (31, 32).
8. The boiler air duct uniform air distribution device according to claim 1, characterized in that the air volume uniform air distribution assembly (1, 2, 3, 4) comprises: the guide plate group (4) is arranged at the air channel of the secondary air channel steering elbow of the front wall of the hearth, and the guide plate group (4) is used for reducing the resistance of the secondary air channel of the front wall of the hearth.
9. The boiler air duct uniform air distribution device according to claim 8, characterized in that the guide plate group (4) is composed of a plurality of elbow guide plates (41, 42, 43, 44, 45, 46).
10. A million double tangential circle boiler, comprising: boiler air duct and uniform air distribution device according to any of claims 1-9, the boiler air duct comprising: the boiler air duct uniform air distribution device is arranged at the secondary air duct of the front wall and the rear wall of the hearth and at the air duct (6, 7, 9, 10) of the over-fire air corner bellows of the front wall and the rear wall of the hearth.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120631823.XU CN216203479U (en) | 2021-03-29 | 2021-03-29 | Million double tangential circle boiler and uniform air distribution device for boiler air duct |
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| CN202120631823.XU CN216203479U (en) | 2021-03-29 | 2021-03-29 | Million double tangential circle boiler and uniform air distribution device for boiler air duct |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115076676A (en) * | 2022-06-22 | 2022-09-20 | 苏州西热节能环保技术有限公司 | Method for preventing and controlling corrosion of water wall based on online accurate measurement |
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2021
- 2021-03-29 CN CN202120631823.XU patent/CN216203479U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115076676A (en) * | 2022-06-22 | 2022-09-20 | 苏州西热节能环保技术有限公司 | Method for preventing and controlling corrosion of water wall based on online accurate measurement |
| CN115076676B (en) * | 2022-06-22 | 2023-09-22 | 苏州西热节能环保技术有限公司 | Method for preventing and controlling water-cooled wall corrosion based on online accurate measurement |
| WO2023246029A1 (en) * | 2022-06-22 | 2023-12-28 | 苏州西热节能环保技术有限公司 | Online precise measurement-based method for preventing and controlling corrosion of water-cooled wall |
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