A combustion air flow regulating device for a circulating fluidized bed boiler

Abstract

The present invention discloses a combustion air flow regulating device for a circulating fluidized bed boiler, which includes a circulating fluidized bed boiler, an auxiliary component, a regulating component and a cleaning component. The regulating component includes a damper, and the cleaning component includes a cleaning mechanism and an impact mechanism. The present invention controls the flue gas in a passive manner through the damper, ensuring safety while keeping the air pressure in the combustion flue gas boiler at a relatively high pressure, so as to extend the fuel residence time and maintain the stability of the bed temperature, etc.; when discharging the flue gas, the cleaning mechanism and the impact mechanism are driven to clean the inner wall of the regulating pipe, and when the flue gas drives the cleaning mechanism and the impact mechanism, the speed of the flue gas discharged from the circulating fluidized bed boiler can be slowed down, so as to maintain the pressure in the boiler, thereby extending the fuel residence time, improving the sufficiency of the combustion reaction, maintaining the stability of the bed temperature while reducing the generation of CO and NOX.

Description

Technical Field

[0001] The present invention relates to the technical field of circulating fluidized bed boilers, and particularly relates to a combustion air flow regulating device for a circulating fluidized bed boiler. Background Art

[0002] Circulating fluidized bed boilers adopt fluidized bed combustion technology, and enhance combustion and desulfurization reactions through high wind speeds, significantly improving fuel combustion efficiency. Their unique design can handle difficult-to-burn solid fuels such as coal gangue, oil shale, and municipal waste, realizing the efficient utilization of resources. Unburned particles during the combustion process re-participate in combustion through the separator and return material system, reducing fuel waste. Circulating fluidized bed boilers play a core role in the fields of clean energy utilization, industrial heating, and cogeneration of heat and power through efficient combustion, environmental protection and emission reduction, fuel adaptability, and equipment synergy.

[0003] For example, in the patent application with the publication number CN110081422A, the publication date of August 2, 2019, and the title "A Flue Gas Circulation System and Method for a Circulating Fluidized Bed Boiler", this application includes a flue gas circulation pipeline for extraction, a flue gas circulation branch pipe, and a first electric switch door; the interface of the flue gas circulation pipeline for extraction is arranged at the outlet of the induced draft fan, and the first electric switch door is arranged at the inlet of the flue gas circulation pipeline for extraction; the flue gas circulation branch pipe includes a first branch pipe communicating with the inlet flue of the desulfurization system absorption tower, a second branch pipe communicating with the secondary air hot air main pipe of the boiler, and a third branch pipe communicating with the primary air hot air main pipe of the boiler; electric regulating valves are respectively arranged on the first branch pipe, the second branch pipe, and the third branch pipe; at the same time, its operation method is disclosed. The flue gas circulation system can be used alone to regulate the flue gas volume at the inlet of the circulating fluidized bed semi-dry desulfurization absorption tower to stabilize the stable operation of the absorption tower, and can also be used alone to regulate the temperature and oxygen content in different regions of the boiler furnace to achieve the control of NO X generation, and has higher environmental protection characteristics compared with conventional flue gas circulation systems under the same energy consumption conditions.

[0004] Although in the above-mentioned prior art, the flue gas in the circulating fluidized bed boiler is controlled through structures such as the first electric switch door and electric regulating valves in the flue gas circulation system to achieve the regulation of the temperature and oxygen content in different regions of the boiler furnace, the above-mentioned flue gas circulation system does not precisely and repeatedly control the flue gas in the circulating fluidized bed boiler to fully utilize the flue gas to regulate the combustion adequacy of the circulating fluidized bed boiler and maintain the furnace temperature, etc. At the same time, the above-mentioned flue gas circulation system does not process the particles in the flue gas, resulting in the particles in the flue gas and the like being easily adhered to the flue gas pipeline. Summary of the Invention

[0005] The purpose of the present invention is to provide a combustion air flow regulating device for a circulating fluidized bed boiler to solve the above deficiencies in the prior art.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A combustion air flow regulating device for a circulating fluidized bed boiler. The circulating fluidized bed boiler includes a boiler and a cyclone separator, and the upper sides of the two are interconnected. The lower sides of the boiler and the cyclone separator are also interconnected. The boiler and the cyclone separator are both arranged on supports. An auxiliary component is arranged on the side of the boiler, and a regulating component is arranged at the upper end of the cyclone separator;

[0008] The regulating component includes a regulating pipe. The regulating pipe is connected to the outlet at the upper end of the cyclone separator. An expansion joint is arranged at one end of the regulating pipe close to the cyclone separator. The expansion joint connects the cyclone separator and the regulating pipe through a flange. A damper is arranged at one end of the regulating pipe close to the expansion joint. The damper is used to regulate the flow rate of the flue gas transported from the cyclone separator to the regulating pipe;

[0009] The cleaning component is arranged in the regulating pipe. The cleaning component includes a mounting frame. A cleaning shaft is rotatably arranged in the middle of the mounting frame. Two cleaning mechanisms are arranged on the outer side of the cleaning shaft. The two cleaning mechanisms are used to clean the inner wall of the regulating pipe. An impact mechanism is arranged at the lower end of each cleaning mechanism. The impact mechanism can knock the regulating pipe when discharging flue gas so as to clean the regulating pipe.

[0010] In the above, the damper includes a mounting rod. Two semi-circular plates are symmetrically arranged on the side of the mounting rod in a rotatable manner. One end of an arc-shaped round rod is arranged on each semi-circular plate. The other end of the arc-shaped round rod is slidably arranged in the mounting rod. A return spring is arranged between the semi-circular plate and the mounting rod. The return spring is sleeved on the outer side of the arc-shaped round rod. A limiting plate is arranged on the mounting rod. The limiting plate is used to limit the downward flipping of the semi-circular plate.

[0011] In the above, the cleaning shaft includes two fixed sections and two swinging sections. The fixed sections are arranged in the middle of the mounting frame. One end of a swinging section is arranged at the lower end of the fixed section through a ball joint, and the swinging section and the fixed section are arranged at intervals. Two spiral grooves are symmetrically arranged on the outer side of each fixed section. The spiral grooves cause the cleaning mechanism to rotate when moving on the fixed section.

[0012] In the above, the cleaning mechanism includes a sliding sleeve. A plurality of partition plates are rotatably arranged on the outer side of the sliding sleeve, and the plurality of partition plates are evenly arranged along the circumferential direction of the sliding sleeve. A torsion spring is arranged between the partition plate and the sliding sleeve. A plurality of limiting blocks are arranged on the outer side of the sliding sleeve. The number of the limiting blocks corresponds to the number of the partition plates. The limiting blocks are used to limit the upward flipping of the partition plates.

[0013] As described above, the torsion springs are arranged circumferentially and uniformly along the sliding sleeve with the partition plate, and the torsion of the torsion springs gradually increases.

[0014] As described above, the cleaning mechanism further includes a connecting sleeve which is rotatably arranged at the upper end of the sliding sleeve. Two spiral blocks are symmetrically arranged inside the connecting sleeve, and the spiral blocks are rotatably arranged in the spiral grooves. One ends of a plurality of connecting rods are circumferentially and uniformly arranged on the outer side of the connecting sleeve, and spiral scraping plates are arranged at the other ends of the connecting rods. A support plate is arranged on the lower side of each fixed section, and a telescopic spring is arranged between the support plate and the sliding sleeve.

[0015] As described above, the impact mechanism includes a support sleeve which is arranged on the lower side of the swing section. A plurality of support rods are circumferentially and uniformly arranged on the outer side of the support sleeve, and the support sleeve is connected to each support rod through a spherical hinge. A tension spring is arranged between each support rod and the support sleeve. The end of the support rod away from the support sleeve is provided with a fixing plate, and a rubber layer is slidably arranged on the outer side of the fixing plate.

[0016] As described above, it further includes a support assembly which is arranged on the support seat and used for supporting and limiting the adjusting pipe.

[0017] As described above, the support assembly includes a support member. A sliding plate is slidably arranged on the support frame, a sliding frame is slidably arranged on the sliding plate, a limiting sleeve is rotatably arranged in the middle of the sliding frame, and the adjusting pipe is slidably arranged in the limiting sleeve.

[0018] In the above technical solution, the beneficial effects of the present invention are as follows:

[0019] 1. The present invention controls the flue gas discharged from the circulating fluidized bed boiler in a passive manner through the provided air damper, ensuring safety while keeping the air pressure in the circulating fluidized bed boiler at a relatively high pressure, so as to increase the particle concentration in the dense phase zone and extend the fuel residence time, thereby improving the sufficiency of the combustion reaction and helping to maintain the stability of the bed temperature.

[0020] 2. The present invention cleans the inner wall of the adjusting pipe in a passive manner when the flue gas is discharged from the adjusting pipe through the provided cleaning mechanism. When the flue gas is discharged from the adjusting pipe, it can also drive the impact mechanism to knock the adjusting pipe, thus preventing particles in the flue gas from adhering to the inner wall of the adjusting pipe.

[0021] 3. The cleaning mechanism and the impact mechanism provided in the present invention are driven while the flue gas passes through the regulating pipe to clean the inner wall of the regulating pipe, and the speed of the flue gas discharged from the circulating fluidized bed boiler can be slowed down during the process of the flue gas driving the cleaning mechanism and the impact mechanism, so as to extend the residence time of the fuel, thereby improving the sufficiency of the combustion reaction, maintaining the stability of the bed temperature while reducing the generation of CO and NO X . BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings.

[0023] Figure 1 It is a working schematic diagram of the combustion gas flow regulating device for a circulating fluidized bed boiler provided by an embodiment of the present invention;

[0024] Figure 2 It is a three-dimensional structural schematic diagram of the combustion gas flow regulating device for a circulating fluidized bed boiler provided by another embodiment of the present invention;

[0025] Figure 3 It is a top view of the combustion gas flow regulating device for a circulating fluidized bed boiler provided by another embodiment of the present invention;

[0026] Figure 4 It is provided by another embodiment of the present invention Figure 3 Cross-sectional view at A-A;

[0027] Figure 5 It is a three-dimensional structural schematic diagram of the air damper provided by another embodiment of the present invention;

[0028] Figure 6 It is a partial three-dimensional structural schematic diagram between the cleaning shaft and the cleaning mechanism provided by another embodiment of the present invention;

[0029] Figure 7 It is a three-dimensional cross-sectional view between the sliding sleeve, the connecting sleeve and the spiral block provided by another embodiment of the present invention;

[0030] Figure 8 It is a three-dimensional structural schematic diagram between the fixed section, the swing section, the spiral groove, the support plate, the telescopic spring and the impact mechanism provided by another embodiment of the present invention;

[0031] Figure 9 It is provided by another embodiment of the present invention Figure 4 Partial method schematic diagram at K;

[0032] Figure 10 It is provided by another embodiment of the present inventionFigure 4 Schematic diagram of the local method at N

[0033] Figure 11 Provided by another embodiment of the present invention Figure 4 Schematic diagram of the local method at M

[0034] Description of the reference numerals

[0035] 1. Circulating fluidized bed boiler; 10. Support; 2. Auxiliary component; 3. Adjusting component; 30. Adjusting pipe; 31. Expansion joint; 32. Air damper; 320. Mounting rod; 321. Semi-circular plate; 322. Arc-shaped round rod; 323. Return spring; 324. Limiting plate; 4. Cleaning component; 40. Mounting frame; 41. Cleaning shaft; 410. Fixed section; 411. Oscillating section; 412. Spiral groove; 42. Cleaning mechanism; 420. Sliding sleeve; 421. Partition board; 422. Limiting block; 423. Connecting sleeve; 424. Spiral block; 425. Connecting rod; 426. Spiral scraper; 427. Support plate; 428. Telescopic spring; 43. Impact mechanism; 430. Support sleeve; 431. Support rod; 432. Tension spring; 433. Fixed plate; 434. Rubber layer; 5. Support component; 50. Support frame; 51. Sliding plate; 52. Sliding frame; 53. Limiting sleeve Detailed implementation manners

[0036] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings

[0037] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "vertical", "horizontal", "side", "inner", "outer", "one end", "the other end", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention

[0038] As Figure 1-11 shown, a combustion gas flow regulating device for a circulating fluidized bed boiler provided by an embodiment of the present invention, the circulating fluidized bed boiler 1 includes a boiler and a cyclone separator, the upper sides of the two are interconnected, the lower sides of the boiler and the cyclone separator are also interconnected, the boiler and the cyclone separator are both arranged on the support 10, an auxiliary component 2 is arranged on the side of the boiler, and an adjusting component 3 is arranged at the upper end of the cyclone separator

[0039] Adjusting assembly 3, the adjusting assembly 3 includes an adjusting pipe 30, the adjusting pipe 30 is connected to the outlet at the upper end of the cyclone separator, an expansion joint 31 is provided at one end of the adjusting pipe 30 close to the cyclone separator, the expansion joint 31 is connected to the cyclone separator and the adjusting pipe 30 through a flange, and a damper 32 is provided at one end of the adjusting pipe 30 close to the expansion joint 31. The damper 32 is used to adjust the flow rate of the flue gas transported from the cyclone separator to the adjusting pipe 30;

[0040] Cleaning assembly 4, the cleaning assembly 4 is arranged inside the adjusting pipe 30. The cleaning assembly 4 includes a mounting frame 40, a cleaning shaft 41 is rotatably arranged in the middle of the mounting frame 40, two cleaning mechanisms 42 are arranged on the outer side of the cleaning shaft 41, and the two cleaning mechanisms 42 are used to clean the inner wall of the adjusting pipe 30. An impact mechanism 43 is arranged at the lower end of each cleaning mechanism 42. The impact mechanism 43 can knock on the adjusting pipe 30 when discharging flue gas so as to clean the adjusting pipe 30.

[0041] In another embodiment provided by the present invention, the damper 32 includes a mounting rod 320, two semi-circular plates 321 are symmetrically arranged on the side of the mounting rod 320 in a rotatable manner, one end of an arc-shaped round rod 322 is arranged on each semi-circular plate 321, and the other end of the arc-shaped round rod 322 is slidably arranged in the mounting rod 320. A return spring 323 is arranged between the semi-circular plate 321 and the mounting rod 320, the return spring 323 is sleeved on the outer side of the arc-shaped round rod 322, and a limiting plate 324 is arranged on the mounting rod 320. The limiting plate 324 is used to limit the downward flipping of the semi-circular plate 321;

[0042] The specific implementation method is as follows: During the combustion process of the circulating fluidized bed boiler 1, air flow is continuously introduced into the circulating fluidized bed boiler 1 through the auxiliary component 2. At this time, the combusted air flow will be transported from the boiler to the cyclone separator, so that the cyclone separator separates the air flow at this time, enabling the solids in the air flow to be recycled from the lower end of the cyclone separator back to the boiler. The gas flows through the upper outlet of the cyclone separator to the regulating pipe 30. When the air flow is small when the air flow flows from the cyclone separator to the regulating pipe 30, the semi-circular plate 321 is squeezed by the return spring 323, and the combusted air flow and the air flow input by the auxiliary component 2 are not sufficient to push open the semi-circular plate 321. At this time, the combustion air flow of the circulating fluidized bed boiler 1 will not be discharged from the regulating pipe 30. In this way, the particle concentration in the dense phase zone (the dense phase zone of the circulating fluidized bed boiler 1 refers to the lower part of the circulating fluidized bed combustion chamber, where the gas-solid two-phase flow contains a high concentration of solid particles; correspondingly, there is also a dilute phase zone, which refers to the upper part of the circulating fluidized bed combustion chamber, usually above the secondary air nozzle, where the gas-solid two-phase flow contains a low concentration of solid particles; the transition zone is the section between the dense phase zone and the dilute phase zone) can be increased, the residence time of the fuel can be extended, the sufficiency of the combustion reaction can be improved, and at the same time, the heat storage in the dense phase zone can be increased, which helps to maintain the stability of the bed temperature and reduce the impact of combustion fluctuations on the efficiency. As the combusted air flow in the circulating fluidized bed boiler 1 and the air flow input by the auxiliary component 2 gradually increase, the combustion air flow of the circulating fluidized bed boiler 1 can push open the semi-circular plate 321, causing the semi-circular plate 321 to squeeze the return spring 323, so that the semi-circular plate 321 drives the arc-shaped round rod 322 to rotate along the mounting rod 320, generating a gap between the semi-circular plate 321 and the inner wall of the regulating pipe 30. Thus, the combustion air flow of the circulating fluidized bed boiler 1 passes through the semi-circular plate 321 and flows into the regulating pipe 30 after being separated by the cyclone separator. At this time, the air pressure in the circulating fluidized bed boiler 1 decreases, and the oxygen in the circulating fluidized bed boiler 1 increases, promoting the combustion of combustible gases and fine particles in the dilute phase zone. At the same time, the bed temperature in the dense phase zone drops, inhibiting the burnout rate of large particle fuels. However, the excessive air causes the bed temperature to drop due to the incorporation of excessive cold air, and the generation of CO and NO X increases, resulting in a decrease in the overall combustion efficiency. At the same time, the low bed pressure is accompanied by a reduction in the circulating ash volume, a decrease in the capture efficiency of the cyclone separator, an increase in the carbon content of the flue gas entering the regulating pipe 30 through the semi-circular plate 321, and an increase in fuel loss. To reduce or even avoid the above situation, when the air pressure in the circulating fluidized bed boiler 1 drops, the return spring 323 squeezes the semi-circular plate 321, causing the semi-circular plate 321 to drive the arc-shaped round rod 322 to rotate and reset on the mounting rod 320. In this way, the semi-circular plate 321 controls the opening and closing of the regulating pipe 30, enabling the air pressure in the circulating fluidized bed boiler 1 to cycle between rising and falling, so as to facilitate different combustion treatments of the fuel in the circulating fluidized bed boiler 1, and to take into account the effects under both air pressures in the circulating fluidized bed boiler 1.

[0043] In another embodiment provided by the present invention, the cleaning shaft 41 includes two fixed segments 410 and two swinging segments 411. The fixed segments 410 are arranged in the middle of the mounting bracket 40. A swinging segment 411 is provided at the lower end of the fixed segment 410 through a ball joint, and the fixed segments 410 and the swinging segments 411 are arranged at intervals. Two spiral grooves 412 are symmetrically arranged on the outer side of each fixed segment 410. The spiral grooves 412 are used for the cleaning mechanism 42 to rotate when moving on the fixed segment 410;

[0044] The specific implementation method is as follows: When the combustion airflow generated by the circulating fluidized bed boiler 1 enters the regulating pipe 30 through the semi-circular plate 321, the combustion airflow can drive the cleaning mechanism 42 to move on the outer side of the fixed segment 410, so that the cleaning mechanism 42 rotates while moving on the fixed segment 410 under the action of the spiral groove 412, so as to clean the inner wall of the regulating pipe 30 by the cleaning mechanism 42 moving and rotating along the fixed segment 410, and avoid the adhesion of particulate impurities in the flue gas on the inner wall of the regulating pipe 30.

[0045] In another embodiment provided by the present invention, the cleaning mechanism 42 includes a sliding sleeve 420. A plurality of partition plates 421 are rotatably arranged on the outer side of the sliding sleeve 420, and the plurality of partition plates 421 are evenly arranged along the circumferential direction of the sliding sleeve 420. A torsion spring is arranged between the partition plates 421 and the sliding sleeve 420, and a plurality of limiting blocks 422 are arranged on the outer side of the sliding sleeve 420. The number of the limiting blocks 422 corresponds to the number of the partition plates 421. The limiting blocks 422 are used to limit the upward flipping of the partition plates 421;

[0046] The specific implementation method is as follows: After the combustion gas flow generated by the circulating fluidized bed boiler 1 enters the regulating pipe 30 through the semi-circular plate 321, the combustion gas flow impacts the partition plate 421. When the pressure of the combustion gas flow on the partition plate 421 is less than the torque of the torsion spring, the partition plate 421 will not rotate around the sliding sleeve 420. At this time, the partition plate 421 still seals the regulating pipe 30, and the combustion gas flow will not be discharged from the regulating pipe 30. In this way, the outside air can continue to be conveyed into the circulating fluidized bed boiler 1 through the auxiliary component 2, so as to ensure sufficient fuel combustion while maintaining the air pressure in the circulating fluidized bed boiler 1, in order to extend the fuel residence time, improve the sufficiency of the combustion reaction, maintain the stability of the bed temperature. At the same time, adding a waste heat recovery device at the regulating pipe 30 to recover waste heat can save resources; and as the circulating fluidized bed boiler 1 conveys more combustion gas flow into the regulating pipe 30, the pressure in the regulating pipe 30 increases. At this time, the pressure of the combustion gas flow impacting the partition plate 421 gradually exceeds the torque of the torsion spring. In this way, the combustion gas flow drives the partition plate 421 to compress the torsion spring and rotate outside the sliding sleeve 420, so that a gap appears between the partition plate 421 and the inner wall of the regulating pipe 30, so that the combustion gas flow passes through the partition plate 421 and is discharged from the regulating pipe 30, thereby reducing the pressure in the circulating fluidized bed boiler 1, ensuring combustion safety while ensuring that the auxiliary component 2 can continuously convey oxygen into the circulating fluidized bed boiler 1, and promoting the combustion of combustible gases and fine particles in the dilute phase zone; in addition, after a part of the combustion gas flow in the circulating fluidized bed boiler 1 is discharged, the pressure generated by the combustion gas flow in the regulating pipe 30 decreases and gradually becomes less than the torque of the torsion spring. At this time, the torsion spring drives the partition plate 421 to reset. During the reset process of the partition plate 421, the partition plate 421 is limited by the limit block 422 to prevent the partition plate 421 from rotating excessively and still having a gap with the inner wall of the regulating pipe 30. And when the partition plate 421 seals the regulating pipe 30 again, the pressure of the combustion gas flow in the regulating pipe 30 and in the circulating fluidized bed boiler 1 will rise again, that is, the pressure in the circulating fluidized bed boiler 1 and the regulating pipe 30 always follows the cycle of increasing - decreasing - increasing again, so as to extend the fuel residence time, improve the sufficiency of the combustion reaction and maintain the stability of the bed temperature.

[0047] In another embodiment provided by the present invention, the torsion springs are evenly arranged along the circumferential direction of the sliding sleeve 420 with the partition plate 421, and the torque of the torsion springs gradually increases;

[0048] The specific implementation method is as follows: To fully maintain the pressure inside the circulating fluidized bed boiler 1 to ensure the sufficiency of the combustion reaction, gradually reducing the pressure of the combustion gas flow inside the regulating pipe 30 can ensure the best combustion efficiency. Thus, by setting torsion springs with gradually increasing torques, the pressure generated by the combustion gas flow transported by the circulating fluidized bed boiler 1 into the regulating pipe 30 gradually increases. And during the process of the pressure increase of the combustion gas flow inside the regulating pipe 30, it will exceed the torque of the torsion spring with the lowest torque, causing the partition plate 421 connected to this torsion spring to rotate outside the sliding sleeve 420 and generate a gap between it and the inner wall of the regulating pipe 30. As a result, the combustion gas flow inside the regulating pipe 30 is discharged from the position where the rotating partition plate 421 appears. This is to reduce the pressure inside the regulating pipe 30 and inside the circulating fluidized bed boiler 1 to ensure safety while slowing down the time of pressure reduction inside the circulating fluidized bed boiler 1, avoiding the rapid reduction of the pressure inside the circulating fluidized bed boiler 1 in a short time, thereby ensuring the particle concentration in the dense phase zone and extending the fuel residence time while enhancing the sufficiency of the combustion reaction and maintaining the stability of the bed temperature. And when the pressure inside the circulating fluidized bed boiler 1 and the regulating pipe 30 is too high, the pressure generated by the combustion gas flow inside it can increase the number of partition plates 421 that are pushed open, so as to discharge a large amount of combustion gas flow from the regulating pipe 30 in a short time. Correspondingly, when the pressure inside the circulating fluidized bed boiler 1 and the regulating pipe 30 gradually decreases, the torsion spring with a large torque will first drive the partition plate 421 connected to it to reset, and the torsion spring with a small torque will drive the partition plate 421 connected to it to reset last, so as to ensure that when the pressure inside the circulating fluidized bed boiler 1 and the regulating pipe 30 decreases, the partition plate 421 can correspondingly make corresponding actions, so as to fully control the pressure inside the circulating fluidized bed boiler 1 through the partition plate 421, and further ensure the sufficiency of the combustion reaction of the circulating fluidized bed boiler 1.

[0049] In another embodiment provided by the present invention, the cleaning mechanism 42 further includes a connecting sleeve 423. The connecting sleeve 423 is arranged at the upper end of the sliding sleeve 420 in a rotatable manner. Two spiral blocks 424 are symmetrically arranged inside the connecting sleeve 423. The spiral blocks 424 are arranged in the spiral grooves 412 in a rotatable manner. One ends of a plurality of connecting rods 425 are uniformly arranged along the circumferential direction of the outside of the connecting sleeve 423. The other ends of the connecting rods 425 are provided with spiral scrapers 426. A support plate 427 is arranged below each fixed section 410. A telescopic spring 428 is arranged between the support plate 427 and the sliding sleeve 420.

[0050] The specific implementation manner is as follows: When the pressure impact generated by the combustion airflow in the regulating pipe 30 impacts the partition plate 421, the combustion airflow can squeeze the partition plate 421, causing the partition plate 421 to drive the sliding sleeve 420 to squeeze the telescopic spring 428 and descend along the fixed section 410. At the same time that the sliding sleeve 420 descends along the fixed section 410, it can drive the connecting sleeve 423 to descend synchronously. While the connecting sleeve 423 descends along the fixed section 410, the connecting sleeve 423 can drive two symmetrically arranged spiral blocks 424 therein to slide along the spiral groove 412 on the fixed section 410. In this way, while the connecting sleeve 423 descends along the fixed section 410, it drives its rotation on the fixed section 410 through the cooperation between the spiral block 424 and the spiral groove 412, that is, the connecting sleeve 423 rotates while descending along the fixed section 410 with the sliding sleeve 420. When the connecting sleeve 423 rotates, it drives a plurality of connecting rods 425 arranged on its outer side to rotate while descending along the fixed section 410, so that the connecting rods 425 drive the spiral scraper 426 connected thereto to rotate while descending along the fixed section 410, thereby enabling the spiral scraper 426 to scrape and clean the inner wall of the regulating pipe 30; when the pressure generated by the combustion airflow in the regulating pipe 30 decreases, the telescopic spring 428 drives the sliding sleeve 420 and the connecting sleeve 423 to move in the reverse direction along the fixed section 410 to reset. At this time, the spiral block 424 and the spiral groove 412 cooperate to drive the connecting sleeve 423 to rotate in the reverse direction, so that the connecting sleeve 423 drives the spiral scraper 426 to rotate in the reverse direction through the connecting rod 425 to perform secondary scraping and cleaning on the inner wall of the regulating pipe 30, thereby preventing the particles in the combustion airflow from adhering to the inner wall of the regulating pipe 30.

[0051] In another embodiment provided by the present invention, the impact mechanism 43 includes a support sleeve 430, which is arranged on the lower side of the swing section 411. A plurality of support rods 431 are evenly arranged on the outer side of the support sleeve 430 along its circumferential direction, and the support sleeve 430 is connected to each support rod 431 through a spherical hinge. A tension spring 432 is arranged between each support rod 431 and the support sleeve 430. The end of the support rod 431 away from the support sleeve 430 is provided with a fixing plate 433, and a rubber layer 434 is arranged on the outer side of the fixing plate 433 in a sliding manner;

[0052] The specific implementation method is as follows: When the pressure impact generated by the combustion airflow in the regulating pipe 30 impacts the partition plate 421, the partition plate 421 rotates and folds up. At this time, the combustion airflow passes through the partition plate 421. While the combustion airflow passes through the partition plate 421, it blows the fixing plate 433, causing the fixing plate 433 to drive the support rod 431 to rotate outside the support sleeve 430. During the rotation of the support rod 431, the tension spring 432 is pulled. In this way, under the combined action of the combustion airflow and the tension spring 432, the support rod 431 drives the fixing plate 433 to swing on the support sleeve 430, causing the fixing plate 433 to intermittently strike the inner wall of the regulating pipe 30, so that the combustion particles adhered to the inner wall of the regulating pipe 30 fall off and are discharged from the regulating pipe 30 together with the combustion airflow; and when the fixing plate 433 strikes the inner wall of the regulating pipe 30, the two are in contact through the rubber layer 434, and the rubber layer 434 can effectively reduce the noise generated when the fixing plate 433 strikes the regulating pipe 30.

[0053] In another embodiment provided by the present invention, it further includes a support assembly 5. The support assembly 5 is arranged on the support 10, and the support assembly 5 is used to support and limit the regulating pipe 30;

[0054] The specific implementation method is as follows: The support assembly 5 is arranged outside the regulating pipe 30. The support assembly 5 is used to support and limit the regulating pipe 30. At the same time, when the fixing plate 433 bridges the regulating pipe 30, the support assembly 5 can move correspondingly with the vibration of the regulating pipe 30, so that the vibration of the strike can be fully transmitted to every part of the regulating pipe 30, ensuring that the vibration of the fixing plate 433 striking can fully remove the combustion particles in the regulating pipe 30.

[0055] In another embodiment provided by the present invention, the support assembly 5 includes a support member. A sliding plate 51 is arranged on the support frame 50 in a sliding manner. A sliding frame 52 is arranged on the sliding plate 51 in a sliding manner. A limiting sleeve 53 is arranged in the middle of the sliding frame 52 in a rotating manner. The regulating pipe 30 is arranged in the limiting sleeve 53 in a sliding manner;

[0056] The specific implementation method is as follows: The sliding plate 51 can move away from or close to the boiler along the support member. The sliding frame 52 can move along the length direction of the sliding plate 51, that is, perpendicular to the moving direction of the sliding plate 51. The limiting sleeve 53 can rotate in the middle of the sliding frame 52. In this way, when the fixing plate 433 strikes the inner wall of the regulating pipe 30, the regulating pipe 30 vibrates. At this time, under the action of the expansion joint 31, the regulating pipe 30 will move within a small range, which is convenient for reducing or even avoiding the vibration generated during the strike from being transmitted to the cyclone separator or the boiler when the regulating pipe 30 is cleaned by being struck.

[0057] Working principle: During the combustion process of the circulating fluidized bed boiler 1, the air flow is continuously introduced into the circulating fluidized bed boiler 1 through the auxiliary component 2. At this time, the combustion air flow will be transported from the boiler to the cyclone separator, so that the cyclone separator separates the air flow at this time, and the solids in the air flow are returned to the boiler from the lower end of the cyclone separator for reuse. The gas flows through the upper outlet of the cyclone separator to the regulating pipe 30. When the air flow is small when the air flow flows from the cyclone separator to the regulating pipe 30, the semi-circular plate 321 is squeezed by the return spring 323, and the combustion air flow and the air flow input by the auxiliary component 2 are not enough to push open the semi-circular plate 321. At this time, the combustion air flow of the circulating fluidized bed boiler 1 will not be discharged from the regulating pipe 30. In this way, the particle concentration in the dense phase zone can be increased, the fuel residence time can be extended, the combustion reaction adequacy can be improved, and at the same time, the heat storage in the dense phase zone can be increased, which helps to maintain the stability of the bed temperature and reduce the influence of combustion fluctuations on the efficiency. As the combustion air flow generated in the circulating fluidized bed boiler 1 and the air flow input by the auxiliary component 2 gradually increase, the combustion air flow of the circulating fluidized bed boiler 1 can push open the semi-circular plate 321, so that the semi-circular plate 321 squeezes the return spring 323, so that the semi-circular plate 321 drives the arc-shaped round rod 322 to rotate along the mounting rod 320, so that a gap is generated between the semi-circular plate 321 and the inner wall of the regulating pipe 30, so that the combustion air flow of the circulating fluidized bed boiler 1 passes through the semi-circular plate 321 and flows into the regulating pipe 30 after being separated by the cyclone separator. At this time, the air pressure in the circulating fluidized bed boiler 1 decreases, and the oxygen in the circulating fluidized bed boiler 1 increases, promoting the combustion of combustible gases and fine particles in the dilute phase zone. At the same time, the bed temperature in the dense phase zone drops, inhibiting the burnout speed of large particle fuels. However, the excessive air causes the bed temperature to drop due to the incorporation of excessive cold air, and the generation of CO and NO X increases, and the overall combustion efficiency decreases. At the same time, the low bed pressure is accompanied by a reduction in the circulating ash volume, and the capture efficiency of the cyclone separator decreases. The carbon content of the flue gas entering the regulating pipe 30 through the semi-circular plate 321 increases, and the fuel loss increases. To reduce or even avoid the above situation, when the air pressure in the circulating fluidized bed boiler 1 drops, the return spring 323 squeezes the semi-circular plate 321, so that the semi-circular plate 321 drives the arc-shaped round rod 322 to rotate and reset on the mounting rod 320. In this way, the semi-circular plate 321 controls the opening and closing of the regulating pipe 30, so that the air pressure in the circulating fluidized bed boiler 1 cycles between rising and falling, so as to facilitate different combustion treatments of the fuel in the circulating fluidized bed boiler 1, so as to balance the effects under two air pressures in the circulating fluidized bed boiler 1;

[0058] When the combustion gas flow generated by the circulating fluidized bed boiler 1 enters the regulating pipe 30 through the semi-circular plate 321, the combustion gas flow can drive the cleaning mechanism 42 to move outside the fixed section 410, so that the cleaning mechanism 42 rotates while moving on the fixed section 410 under the action of the spiral groove 412, so as to clean the inner wall of the regulating pipe 30 during the movement and rotation along the fixed section 410. Specifically, after the combustion gas flow generated by the circulating fluidized bed boiler 1 enters the regulating pipe 30 through the semi-circular plate 321, the combustion gas flow impacts the partition plate 421. When the pressure of the combustion gas flow on the partition plate 421 is less than the torsion of the torsion spring, the partition plate 421 will not rotate around the sliding sleeve 420. At this time, the partition plate 421 still seals the regulating pipe 30, and the combustion gas flow will not be discharged from the regulating pipe 30. In this way, the outside air can continue to be transported into the circulating fluidized bed boiler 1 through the auxiliary component 2, so as to ensure sufficient fuel combustion while maintaining the air pressure in the circulating fluidized bed boiler 1, so as to extend the fuel residence time, improve the sufficiency of the combustion reaction, maintain the stable bed temperature. At the same time, adding a waste heat recovery device at the regulating pipe 30 to recover waste heat can save resources; and as the circulating fluidized bed boiler 1 transports more combustion gas flow into the regulating pipe 30, the pressure in the regulating pipe 30 increases. At this time, the pressure of the combustion gas flow impacting the partition plate 421 gradually increases and exceeds the torsion of the torsion spring. In this way, the combustion gas flow drives the partition plate 421 to squeeze the torsion spring and rotate outside the sliding sleeve 420, so that a gap appears between the partition plate 421 and the inner wall of the regulating pipe 30, so that the combustion gas flow passes through the partition plate 421 and is discharged from the regulating pipe 30, thereby reducing the pressure in the circulating fluidized bed boiler 1, ensuring combustion safety while ensuring that the auxiliary component 2 can continuously transport oxygen into the circulating fluidized bed boiler 1, and promoting the combustion of combustible gases and fine particles in the dilute phase zone; in addition, after a part of the combustion gas flow in the circulating fluidized bed boiler 1 is discharged, the pressure generated by the combustion gas flow in the regulating pipe 30 decreases and gradually becomes less than the torsion of the torsion spring. At this time, the torsion spring drives the partition plate 421 to reset. During the reset process of the partition plate 421, the partition plate 421 is limited by the limit block 422 to prevent the partition plate 421 from rotating too much and still having a gap with the inner wall of the regulating pipe 30. And when the partition plate 421 seals the regulating pipe 30 again, the pressure of the combustion gas flow in the regulating pipe 30 and in the circulating fluidized bed boiler 1 will rise again, that is, the pressure in the circulating fluidized bed boiler 1 and the regulating pipe 30 always follows the cycle of increasing - decreasing - increasing again, so as to extend the fuel residence time, improve the sufficiency of the combustion reaction and maintain the stable bed temperature;

[0059] To fully maintain the pressure inside the circulating fluidized bed boiler 1 to ensure the sufficiency of the combustion reaction, gradually reducing the pressure of the combustion gas flow inside the regulating pipe 30 can ensure the optimal combustion efficiency. Thus, by setting torsion springs with gradually increasing torsion, the pressure generated by the combustion gas flow transported from the circulating fluidized bed boiler 1 into the regulating pipe 30 gradually increases. And during the process of the pressure increase of the combustion gas flow inside the regulating pipe 30, it will exceed the torsion of the torsion spring with the lowest torsion, causing the partition plate 421 connected to this torsion spring to rotate outside the sliding sleeve 420 and generate a gap between it and the inner wall of the regulating pipe 30. As a result, the combustion gas flow inside the regulating pipe 30 is discharged from the position where the rotating partition plate 421 appears, so as to reduce the pressure inside the regulating pipe 30 and inside the circulating fluidized bed boiler 1 to ensure safety while slowing down the time of pressure reduction inside the circulating fluidized bed boiler 1, avoiding the rapid reduction of the pressure inside the circulating fluidized bed boiler 1 in a short time, thereby ensuring the particle concentration in the dense phase zone and prolonging the fuel residence time while enhancing the sufficiency of the combustion reaction and maintaining the stability of the bed temperature; and when the pressure inside the circulating fluidized bed boiler 1 and the regulating pipe 30 is too high, the pressure generated by the combustion gas flow inside them can increase the number of partition plates 421 that are flushed open, so as to discharge a large amount of combustion gas flow from the regulating pipe 30 in a short time; correspondingly, when the pressure inside the circulating fluidized bed boiler 1 and the regulating pipe 30 gradually decreases, the torsion spring with a large torsion will first drive the partition plate 421 connected to it to reset, and the torsion spring with a small torsion will drive the partition plate 421 connected to it to reset last, so as to ensure that when the pressure inside the circulating fluidized bed boiler 1 and the regulating pipe 30 decreases, the partition plate 421 can correspondingly make corresponding actions, so as to fully control the pressure inside the circulating fluidized bed boiler 1 through the partition plate 421, and further ensure the sufficiency of the combustion reaction of the circulating fluidized bed boiler 1;

[0060] When the pressure shock generated by the combustion airflow in the regulating pipe 30 impacts the partition plate 421, the combustion airflow can squeeze the partition plate 421, causing the partition plate 421 to drive the sliding sleeve 420 to squeeze the telescopic spring 428 and descend along the fixed section 410. At the same time that the sliding sleeve 420 descends along the fixed section 410, it can drive the connecting sleeve 423 to descend synchronously. While the connecting sleeve 423 descends along the fixed section 410, the connecting sleeve 423 can drive the two symmetrically arranged spiral blocks 424 inside it to slide along the spiral groove 412 on the fixed section 410. In this way, while the connecting sleeve 423 descends along the fixed section 410, it drives its rotation on the fixed section 410 through the cooperation between the spiral block 424 and the spiral groove 412, that is, the connecting sleeve 423 rotates while descending along the fixed section 410 with the sliding sleeve 420. When the connecting sleeve 423 rotates, it drives the multiple connecting rods 425 arranged on its outer side to rotate while descending around the fixed section 410, causing the connecting rods 425 to drive the spiral scraper 426 connected to them to rotate while descending around the fixed section 410, so that the spiral scraper 426 scrapes and cleans the inner wall of the regulating pipe 30; when the pressure generated by the combustion airflow in the regulating pipe 30 decreases, the telescopic spring 428 drives the sliding sleeve 420 and the connecting sleeve 423 to move in the reverse direction along the fixed section 410 to reset. At this time, the spiral block 424 and the spiral groove 412 cooperate to drive the connecting sleeve 423 to rotate in the reverse direction, so that the connecting sleeve 423 drives the spiral scraper 426 to rotate in the reverse direction through the connecting rod 425 to perform secondary scraping and cleaning on the inner wall of the regulating pipe 30, thus preventing the particles in the combustion airflow from adhering to the inner wall of the regulating pipe 30; at the same time, when the pressure shock generated by the combustion airflow in the regulating pipe 30 impacts the partition plate 421, the combustion airflow can squeeze the partition plate 421, causing the partition plate 421 to drive the sliding sleeve 420 to squeeze the telescopic spring 428 and descend along the fixed section 410. At the same time that the sliding sleeve 420 descends along the fixed section 410, it can drive the connecting sleeve 423 to descend synchronously. While the connecting sleeve 423 descends along the fixed section 410, the connecting sleeve 423 can drive the two symmetrically arranged spiral blocks 424 inside it to slide along the spiral groove 412 on the fixed section 410. In this way, while the connecting sleeve 423 descends along the fixed section 410, it drives its rotation on the fixed section 410 through the cooperation between the spiral block 424 and the spiral groove 412, that is, the connecting sleeve 423 rotates while descending along the fixed section 410 with the sliding sleeve 420. When the connecting sleeve 423 rotates, it drives the multiple connecting rods 425 arranged on its outer side to rotate while descending around the fixed section 410, causing the connecting rods 425 to drive the spiral scraper 426 connected to them to rotate while descending around the fixed section 410, so that the spiral scraper 426 scrapes and cleans the inner wall of the regulating pipe 30;When the pressure generated by the combustion gas flow in the regulating pipe 30 decreases, the telescopic spring 428 drives the sliding sleeve 420 and the connecting sleeve 423 to move reversely along the fixed section 410 to reset. At this time, the spiral block 424 cooperates with the spiral groove 412 to drive the connecting sleeve 423 to rotate reversely, so that the connecting sleeve 423 drives the spiral scraper 426 to rotate reversely through the connecting rod 425 to scrape and clean the inner wall of the regulating pipe 30 for the second time, thus preventing the particles in the combustion gas flow from adhering to the inner wall of the regulating pipe 30; at the same time, when the pressure generated by the combustion gas flow in the regulating pipe 30 impacts the partition plate 421, the partition plate 421 rotates and folds up. At this time, the combustion gas flow passes through the partition plate 421, and while the combustion gas flow passes through the partition plate 421, it blows the fixing plate 433, so that the fixing plate 433 drives the support rod 431 to rotate outside the support sleeve 430. During the rotation of the support rod 431, the tension spring 432 is pulled. In this way, under the combined action of the combustion gas flow and the tension spring 432, the support rod 431 drives the fixing plate 433 to swing on the support sleeve 430, so that the fixing plate 433 intermittently knocks on the inner wall of the regulating pipe 30, so that the combustion particles adhering to the inner wall of the regulating pipe 30 fall off and are discharged from the regulating pipe 30 together with the combustion gas flow; and when the fixing plate 433 knocks on the inner wall of the regulating pipe 30, the two are in contact through the rubber layer 434, and the rubber layer 434 can fully reduce the noise generated when the fixing plate 433 knocks on the regulating pipe 30;

[0061] When the fixing plate 433 bridges the regulating pipe 30, it can move correspondingly with the vibration of the regulating pipe 30, so that the vibration of the knocking can be fully transmitted to every part of the regulating pipe 30, ensuring that the vibration of the fixing plate 433 knocking can fully remove the combustion particles in the regulating pipe 30. Specifically, the sliding plate 51 can move away from or close to the boiler along the support member, the sliding frame 52 can move along the length direction of the sliding plate 51, that is, perpendicular to the moving direction of the sliding plate 51, and the limit sleeve 53 can rotate in the middle of the sliding frame 52. In this way, when the fixing plate 433 knocks on the inner wall of the regulating pipe 30, the regulating pipe 30 vibrates. At this time, under the action of the expansion joint 31, the regulating pipe 30 will move within a small range, which is convenient for the regulating pipe 30 to reduce or even avoid the vibration generated during knocking from being transmitted to the cyclone separator or the boiler when being knocked and cleaned.

[0062] Only some exemplary embodiments of the present invention are described by way of illustration above. Undoubtedly, for those of ordinary skill in the art, without departing from the spirit and scope of the present invention, the described embodiments can be modified in various different ways. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the protection scope of the claims of the present invention.

Claims

1. A combustion air flow regulating device for a circulating fluidized bed boiler. The circulating fluidized bed boiler (1) includes a boiler and a cyclone separator, the upper sides of which are interconnected, and the lower sides of the boiler and the cyclone separator are also interconnected. The boiler and the cyclone separator are both arranged on a support (10). An auxiliary component (2) is arranged on the side of the boiler, and a regulating component (3) is arranged at the upper end of the cyclone separator. It is characterized in that The regulating component (3), the regulating component (3) includes a regulating pipe (30), the regulating pipe (30) is connected to the outlet at the upper end of the cyclone separator. An expansion joint (31) is arranged at one end of the regulating pipe (30) close to the cyclone separator. The expansion joint (31) connects the cyclone separator and the regulating pipe (30) through a flange. A damper (32) is arranged at one end of the regulating pipe (30) close to the expansion joint (31). The damper (32) is used to regulate the flow rate of the flue gas transported from the cyclone separator to the regulating pipe (30); The cleaning component (4), the cleaning component (4) is arranged in the regulating pipe (30). The cleaning component (4) includes a mounting frame (40). A cleaning shaft (41) is rotatably arranged in the middle of the mounting frame (40). Two cleaning mechanisms (42) are arranged on the outer side of the cleaning shaft (41). The two cleaning mechanisms (42) are used to clean the inner wall of the regulating pipe (30). An impact mechanism (43) is arranged at the lower end of each cleaning mechanism (42). The impact mechanism (43) can knock the regulating pipe (30) when discharging flue gas so as to clean the regulating pipe (30); The cleaning shaft (41) includes two fixed sections (410) and two swinging sections (411). The fixed sections (410) are arranged in the middle of the mounting frame (40). A swinging section (411) is arranged at the lower end of the fixed section (410) through a ball joint, and the fixed section (410) and the swinging section (411) are arranged at intervals. Two spiral grooves (412) are symmetrically arranged on the outer side of each fixed section (410). The spiral grooves (412) cause the cleaning mechanism (42) to rotate when moving on the fixed section (410); The cleaning mechanism (42) includes a sliding sleeve (420). A plurality of partition plates (421) are rotatably arranged on the outer side of the sliding sleeve (420), and the plurality of partition plates (421) are evenly arranged along the circumferential direction of the sliding sleeve (420). A torsion spring is arranged between the partition plate (421) and the sliding sleeve (420). A plurality of limit blocks (422) are arranged on the outer side of the sliding sleeve (420). The number of the limit blocks (422) corresponds to the number of the partition plates (421). The limit blocks (422) are used to limit the upward flipping of the partition plates (421); The cleaning mechanism (42) further includes a connecting sleeve (423). The connecting sleeve (423) is rotatably arranged at the upper end of the sliding sleeve (420). Two spiral blocks (424) are symmetrically arranged inside the connecting sleeve (423). The spiral blocks (424) are rotatably arranged in the spiral grooves (412). One ends of a plurality of connecting rods (425) are evenly arranged along the circumferential direction of the outer side of the connecting sleeve (423). The other ends of the connecting rods (425) are provided with spiral scrapers (426). One support plate (427) is arranged on the lower side of each fixed section (410). A telescopic spring (428) is arranged between the support plate (427) and the sliding sleeve (420).

2. The combustion air flow regulating device for a circulating fluidized bed boiler according to claim 1, characterized in that The air damper (32) includes a mounting rod (320). Two semi-circular plates (321) are symmetrically arranged on the side of the mounting rod (320) in a rotatable manner. One ends of an arc-shaped round rod (322) are arranged on each semi-circular plate (321). The other ends of the arc-shaped round rods (322) are slidably arranged in the mounting rod (320). A return spring (323) is arranged between the semi-circular plate (321) and the mounting rod (320). The return spring (323) is sleeved on the outer side of the arc-shaped round rod (322). A limiting plate (324) is arranged on the mounting rod (320). The limiting plate (324) is used to limit the downward flipping of the semi-circular plate (321).

3. A combustion air flow regulating device for a circulating fluidized bed boiler according to claim 1, characterized in that, The torsion springs are evenly arranged along the circumferential direction of the sliding sleeve (420) with the partition plate (421), and the torque of the torsion springs gradually increases.

4. A combustion gas flow regulating device for a circulating fluidized bed boiler according to claim 1, characterized in that, The impact mechanism (43) includes a support sleeve (430). The support sleeve (430) is arranged on the lower side of the swing section (411). A plurality of support rods (431) are evenly arranged along the circumferential direction of the outer side of the support sleeve (430). The support sleeve (430) and each support rod (431) are connected by a ball joint. A tension spring (432) is arranged between each support rod (431) and the support sleeve (430). One end of the support rod (431) away from the support sleeve (430) is provided with a fixing plate (433). A rubber layer (434) is slidably arranged on the outer side of the fixing plate (433).

5. A combustion air flow regulating device for a circulating fluidized bed boiler according to claim 1, characterized in that, It further includes a support assembly (5). The support assembly (5) is arranged on the support (10). The support assembly (5) is used to support and limit the adjusting pipe (30).

6. The combustion air flow regulating device for a circulating fluidized bed boiler according to claim 5, wherein, The support assembly (5) includes a support frame (50). A sliding plate (51) is slidably arranged on the support frame (50). A sliding frame (52) is slidably arranged on the sliding plate (51). A limiting sleeve (53) is rotatably arranged in the middle of the sliding frame (52). The adjusting pipe (30) is slidably arranged in the limiting sleeve (53).

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