Symmetrical arrangement of air chamber ignition system for circulating fluidized bed boiler and implementation method

Abstract

This invention discloses a symmetrically arranged air chamber ignition system and its implementation method for a circulating fluidized bed boiler. The system includes hot air pipelines, fuel pipelines, compressed air pipelines, and an ignition unit. The hot air pipelines, fuel pipelines, and compressed air pipelines are connected to the ignition unit, which is connected to the boiler's primary air chamber. The hot air pipelines include a hot air inlet pipe, a distribution fan, and a hot air outlet pipe. The hot air inlet pipe and hot air outlet pipe are connected to the inlet and outlet of the distribution fan, respectively. This invention features a rationally designed system that uses atomized diesel fuel for ignition, resulting in rapid start-up, fuel savings, convenient switching, flexible operation, and high safety, thus reducing production costs. Furthermore, the compressed air pressure is controlled at 0.2–0.4 MPa for atomization, while the oil pressure is controlled at 2.0–3.0 MPa to ensure good atomization of the oil sprayed from the oil gun, resulting in good combustion after ignition, rapid temperature rise, high fuel utilization, and energy savings.

Description

Technical Field

[0001] This invention relates to the field of circulating fluidized bed boiler ignition technology, and in particular to a symmetrically arranged air chamber ignition system and its implementation method for circulating fluidized bed boilers. Background Technology

[0002] The oil ignition system is a crucial auxiliary system for circulating fluidized bed boilers. Using traditional natural gas ignition is prone to gas leaks, posing a significant danger. If a torch is used for ignition, improper furnace negative pressure adjustment can lead to flameout, delaying ignition time and even causing coking on the boiler bed due to overheating. This not only affects normal boiler startup but also wastes manpower and resources, ultimately impacting the user's electricity and steam supply and causing substantial losses to the enterprise. Furthermore, the traditional ignition unit arrangement is simple and straightforward, easily resulting in uneven heating of the boiler's air chamber cross-section. This creates significant stress between the air chamber and the upper part of the boiler, affecting normal operation and shortening its service life.

[0003] In summary, to address the problems of high risk, long ignition time, difficulty in controlling negative pressure, and localized coking associated with existing ignition methods, this invention provides a symmetrically arranged air chamber ignition system and implementation method for circulating fluidized bed boilers, which can effectively solve these problems. Summary of the Invention

[0004] To address the problems mentioned in the background section, this invention provides a symmetrically arranged air chamber ignition system and implementation method for a circulating fluidized bed boiler.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] The circulating fluidized bed boiler has a symmetrically arranged air chamber ignition system, which includes hot air pipelines, fuel pipelines, compressed air pipelines, and an ignition unit. The hot air pipelines, fuel pipelines, and compressed air pipelines are respectively connected to the ignition unit, and the ignition unit is connected to the primary air chamber of the boiler.

[0007] Preferably, the hot air pipeline includes a hot air inlet pipe, a distribution fan, and a hot air outlet pipe. The hot air inlet pipe and the hot air outlet pipe are respectively connected to the inlet and outlet of the distribution fan, and the hot air outlet pipe is connected to the ignition unit to provide sufficient oxygen content for the burner.

[0008] Preferably, the fuel pipeline is led from the oil storage tank, with one end connected to the oil storage tank and the other end connected to the ignition unit, and the oil pressure of the fuel pipeline is controlled at 2.0-3.0 MPa.

[0009] Preferably, the compressed air pipeline is led from the air compressor, with one end connected to the air compressor and the other end distributed to each ignition unit. The compressed air distributed to the ignition unit is divided into two paths: one path is used to purge the ignition channel and also as atomizing air, and the other path is used to purge the oil circuit before ignition. The compressed air pressure is controlled at 0.2-0.4 MPa.

[0010] Preferably, the ignition unit includes an oil line branch pipe, an oil line electric ball valve, an oil line branch pipe shut-off valve, an oil filter, a propeller, a flame detector, a burner, an igniter, a hot air interface, an ignition tube, compressed air branch pipe A-2, compressed air branch pipe A shut-off valve, compressed air branch pipe B check valve, compressed air branch pipe B electric ball valve, compressed air branch pipe A-1, and compressed air branch pipe B. The oil line branch pipe shut-off valve should be located near the burner for quick shutdown to prevent oil accumulation in the oil line. All oil line purging points are located above the purging point.

[0011] Preferably, the oil filter is installed between the oil circuit branch pipe shut-off valve and the burner for filtering the oil.

[0012] Preferably, the flame detector is mounted on the ignition unit, with the other end connected to the control and display unit for real-time monitoring of the combustion status.

[0013] Preferably, the igniter is inserted into the interior of the ignition tube through a through hole, and an upper sealing baffle and a lower sealing baffle are fixed to the top and bottom of the igniter, respectively.

[0014] Preferably, the oil filter has a filter element fixed inside, and a flushing inlet pipe and a flushing outlet pipe are respectively connected to the outer wall of the oil filter. The flushing inlet pipe is connected to the top of the filter element, and the flushing outlet pipe is connected to the bottom of the filter element. The oil filter also has a filter element cleaning mechanism installed inside.

[0015] The method for igniting a symmetrically arranged air chamber in a circulating fluidized bed boiler includes the following steps:

[0016] S1. Check whether all valves in the ignition system are tightly closed, and whether the electric ball valve in the oil circuit and the electric ball valve in the compressed air branch B are energized and respond normally.

[0017] S2. After checking and confirming that there is no oil inside the ignition system, use the pusher to pull out the igniter and conduct an ignition test to confirm that the igniter is igniting normally.

[0018] S3. Then push the igniter into the ignition tube and start the oil pump to adjust the oil pressure to reach the ignition oil pressure.

[0019] S4. Close the main oil line shut-off valve, the electric ball valve of the oil line, and the shut-off valve of the oil line branch pipe. Open the main compressed air shut-off valve and the electric ball valve of the compressed air branch B. By adjusting the opening of the one-way valve of the compressed air branch B and the shut-off valve of the compressed air branch A, purge the oil line and the igniter for the first time.

[0020] S5. Open the main oil circuit shut-off valve and the electric ball valve of the oil circuit, adjust the opening of the branch oil circuit shut-off valve and the compressed air branch A shut-off valve, and conduct an atomization experiment.

[0021] S6. Use the thruster to push the igniter into the ignition tube, turn on the air distribution fan, then open the main oil circuit shut-off valve, the oil circuit electric ball valve, and the compressed air branch B electric ball valve. Press the ignition button to make the igniter generate a spark. Adjust the opening of the compressed air branch A shut-off valve and the oil circuit branch shut-off valve. You should be able to observe immediate ignition. If ignition fails, immediately close the oil circuit branch shut-off valve to stop the oil supply. Use hot air to purge the air chamber. After checking for any abnormalities, try igniting again. After successful ignition, remove the igniter and control the temperature to rise slowly.

[0022] S7. After ignition, close the main oil line shut-off valve, the electric ball valve of the oil line, and the shut-off valve of the oil line branch pipe. Keep the main compressed air shut-off valve, the shut-off valve of compressed air branch pipe A, the one-way valve of compressed air branch B, and the electric ball valve of compressed air branch B open to complete the secondary purging of the oil line and ignition cylinder.

[0023] S8. After completing step 7 above, close all remaining valves, the compressed air system will exit, and the ignition system will exit.

[0024] A further optimized technical solution involves starting the oil pump and adjusting the oil pressure to reach the ignition oil pressure. Specifically, this involves opening the main oil line shut-off valve and the electric ball valve, adjusting the branch oil line shut-off valve, and controlling the oil pressure to be between 2.0 and 3.0 MPa.

[0025] A further optimized technical solution involves opening the combustion air damper and the atomizing air damper. Specifically, this involves opening the main compressed air shut-off valve and the electric ball valve of compressed air branch B. By adjusting the opening of the shut-off valve of compressed air branch A, the compressed air pressure is controlled to be between 0.2 and 0.4 MPa.

[0026] A further optimized technical solution involves two ignition units that are switched on at a time, and the two sets are symmetrically distributed. As the temperature requirements continue to increase, it is feasible to add two more symmetrical ignition units.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] 1. The system design of this invention is reasonable. This ignition method using atomized diesel fuel results in fast start-up, fuel savings, convenient switching, flexible operation, and high safety, reducing enterprise production costs. Simultaneously, the compressed air pressure used for atomization is controlled at 0.2-0.4 MPa, while the oil pressure is controlled at 2.0-3.0 MPa, ensuring good atomization of the oil sprayed from the oil gun, good combustion after ignition, rapid temperature rise, high fuel utilization, and energy savings. Furthermore, the advanced system layout of this invention can reduce stress damage to the boiler caused by uneven heating, thus extending the boiler's service life.

[0029] 2. The igniter is inserted into the ignition tube through the through hole, and an upper sealing baffle and a lower sealing baffle are fixed at the top and bottom of the igniter, respectively. When the igniter is inserted into the ignition tube, the lower sealing baffle can seal the insertion hole at the bottom of the ignition tube. When the igniter is pulled out from the ignition tube, the upper sealing baffle can seal the insertion hole at the bottom of the ignition tube, ensuring the airtightness of the bottom of the ignition tube during the ignition process.

[0030] 3. By adding a flushing inlet pipe and a flushing outlet pipe, the filter element can be flushed. The impurities filtered out by the filter element are concentrated at the bottom of the filter element. The water pressure from top to bottom can effectively flush away the impurities at the bottom of the filter element.

[0031] 4. The pusher can drive the rack to move up and down, which in turn drives the horizontal shaft to rotate through the meshing of the rack and spur gear. Then, the second bevel gear meshes with the first bevel gear to drive the cleaning brush to move relative to the filter element, thereby actively cleaning the filter element, preventing it from being blocked, and improving the filtration efficiency of the filter element. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a system flowchart of the present invention;

[0034] Figure 2 This is a diagram of the ignition unit of the present invention;

[0035] Figure 3 This is a front view of the oil filter portion of the present invention;

[0036] Figure 4 This is a left view of the oil filter portion of the present invention;

[0037] Figure 5This is a perspective view of the oil filter portion of the present invention;

[0038] Figure 6 This is a front-view sectional view of the oil filter portion of the present invention;

[0039] Figure 7 This is a three-dimensional cross-sectional view of the oil filter portion of the present invention;

[0040] Figure 8 for Figure 6 Enlarged detail image of position A in the middle;

[0041] Figure 9 for Figure 6 Enlarged detail image of position B in the middle;

[0042] Figure 10 for Figure 7 Enlarged detail image of the C position;

[0043] In the diagram: 1. Hot air inlet pipe; 2. Air distribution fan; 3. Hot air outlet pipe; 4. Primary air chamber; 5. Ignition unit; 5. Oil circuit branch pipe; 51. Oil circuit electric ball valve; 52. Oil circuit branch pipe shut-off valve; 53. Oil filter; 54. Filter element; 5401. Mounting bracket; 5402. Vertical rotating shaft; 5403. Cleaning brush; 5404. Horizontal rotating shaft; 5405. Horizontal rotating shaft; 5406. First bevel gear; 5407. Second bevel gear; 5408. Rotary motor; 5409. Threaded rod 5410, horizontal movable support 5411, oil circuit baffle 5412, propeller 55, flame detector 56, burner 57, igniter 58, upper sealing baffle 5801, lower sealing baffle 5802, hot air interface 59, ignition tube 510, compressed air branch A-2511, compressed air branch pipe A shut-off valve 512, compressed air branch B check valve 513, compressed air branch B electric ball valve 514, compressed air branch A-1 515, compressed air branch B 516, flushing water inlet pipe 517, flushing water outlet pipe 518, compressed air main shut-off valve 6, compressed air main pipeline 7, oil circuit main pipeline 8, oil circuit main shut-off valve 9. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] Example 1

[0046] Reference Figure 1-10The circulating fluidized bed boiler has a symmetrically arranged air chamber ignition system, which includes hot air pipelines, fuel pipelines, compressed air pipelines and ignition unit 5. The hot air pipelines, fuel pipelines and compressed air pipelines are respectively connected to the ignition unit, and the ignition unit is connected to the primary air chamber 4 of the boiler.

[0047] The hot air pipeline includes a hot air inlet pipe 1, a distribution fan 2, and a hot air outlet pipe 3. The hot air inlet pipe 1 and the hot air outlet pipe 3 are respectively connected to the inlet and outlet of the distribution fan 2, and the hot air outlet pipe 3 is connected to the ignition unit to provide sufficient oxygen content for the burner.

[0048] The fuel pipeline is led from the oil storage tank, with one end connected to the oil storage tank and the other end connected to the ignition unit 5. The oil pressure of the fuel pipeline is controlled at 2.0-3.0 MPa.

[0049] The compressed air pipeline is drawn from the air compressor. One end is connected to the air compressor, and the other end is distributed to each ignition unit 5. The compressed air distributed to the ignition unit 5 is divided into two paths. One path is used to purge the ignition channel and also as atomizing air. The other path is used to purge the oil circuit before ignition. The compressed air pressure is controlled at 0.2-0.4MPa.

[0050] The ignition unit 5 includes an oil line branch pipe 51, an electric ball valve 52, an oil line branch pipe shut-off valve 53, an oil filter 54, a propeller 55, a flame detector 56, a burner 57, an igniter 58, a hot air interface 59, an ignition tube 510, compressed air branch line A-2 511, compressed air branch line A shut-off valve 512, compressed air branch line B check valve 513, compressed air branch line B electric ball valve 514, compressed air branch line A-1 515, and compressed air branch line B 516. The oil line branch pipe shut-off valve 53 should be located near the burner 57 for quick shutdown to prevent oil accumulation in the oil lines. All oil line purging points are located above the purging point.

[0051] The oil filter 54 is installed between the oil circuit branch pipe shut-off valve 53 and the burner 57 to filter the oil.

[0052] The flame detector 56 is installed on the ignition unit 5, and its other end is connected to the control and display unit for real-time monitoring of the combustion status.

[0053] The igniter 58 is inserted into the ignition tube 510 through a through hole. The top and bottom of the igniter 58 are respectively fixed with an upper sealing baffle 5801 and a lower sealing baffle 5802. When the igniter 58 is inserted into the ignition tube 510, the lower sealing baffle 5802 can seal the bottom insertion hole of the ignition tube 510. When the igniter 58 is pulled out from the ignition tube 510, the upper sealing baffle 5801 can seal the bottom insertion hole of the ignition tube 510, ensuring the airtightness of the bottom of the ignition tube 510 during the ignition process.

[0054] The oil filter 54 has a filter element 5401 fixed inside. The outer wall of the oil filter 54 is connected to a flushing inlet pipe 517 and a flushing outlet pipe 518. The flushing inlet pipe 517 is connected to the top of the filter element 5401, and the flushing outlet pipe 518 is connected to the bottom of the filter element 5401. The oil filter 54 also has a filter element cleaning mechanism installed inside.

[0055] By adding a flushing inlet pipe 517 and a flushing outlet pipe 518, the filter element 5401 can be flushed. The impurities filtered by the filter element 5401 are concentrated at the bottom of the filter element 5401. The impurities at the bottom of the filter element 5401 can be effectively flushed away by the water pressure from top to bottom.

[0056] The method for igniting a symmetrically arranged air chamber in a circulating fluidized bed boiler includes the following steps:

[0057] S1. Check whether all valves in the ignition system are tightly closed, and whether the electric ball valve 52 in the oil circuit and the electric ball valve 514 in the compressed air branch B are connected to power and respond normally.

[0058] S2. After checking and confirming that there is no oil inside the ignition system, use the pusher 55 to pull out the igniter 58 and conduct an ignition test to confirm that the igniter is igniting normally.

[0059] S3. Then push the igniter 58 into the ignition tube 510 and start the oil pump to adjust the oil pressure to reach the ignition oil pressure.

[0060] S4. Close the main oil line shut-off valve 9, the electric ball valve 52, and the branch oil line shut-off valve 53. Open the main compressed air shut-off valve 6 and the electric ball valve 514 of the compressed air branch B. By adjusting the opening of the one-way valve 513 of the compressed air branch B and the shut-off valve 512 of the compressed air branch A, purge the oil lines and igniter for the first time.

[0061] S5. Open the main oil circuit shut-off valve 9 and the electric ball valve 52, adjust the opening of the branch oil circuit shut-off valve 53 and the compressed air branch A shut-off valve 512, and conduct an atomization experiment.

[0062] S6. Use the thruster 55 to push the igniter 58 into the ignition tube 510, turn on the air distribution fan 2, then open the main oil circuit shut-off valve 9, the oil circuit electric ball valve 52, and the compressed air branch B electric ball valve 514. Press the ignition button to make the igniter 58 generate a spark. Adjust the opening of the compressed air branch A shut-off valve 512 and the oil circuit branch shut-off valve 53. You can observe that the ignition will start immediately. If the ignition fails, immediately close the oil circuit branch shut-off valve 53 to stop the oil supply, and use hot air to purge the air chamber. After checking that there are no abnormalities, try to ignite again. After successful ignition, remove the igniter 58 and control the temperature to rise slowly.

[0063] S7. After ignition, close the main oil line shut-off valve 9, the electric ball valve 52 and the branch oil line shut-off valve 53, and keep the main compressed air shut-off valve 6, the branch compressed air A shut-off valve 512, the one-way valve 513 of the branch compressed air B and the electric ball valve 514 of the branch compressed air B open to complete the secondary purging of the oil line and ignition cylinder.

[0064] S8. After completing step 7 above, close all remaining valves, the compressed air system will exit, and the ignition system will exit.

[0065] A further optimized technical solution involves starting the oil pump and adjusting the oil pressure to reach the ignition oil pressure. Specifically, this involves opening the main oil line shut-off valve 9 and the electric ball valve 52, adjusting the branch oil line shut-off valve 53, and controlling the oil pressure to be between 2.0 and 3.0 MPa.

[0066] A further optimized technical solution involves opening the combustion air damper and the atomizing air damper. Specifically, this involves opening the main compressed air shut-off valve 6 and the compressed air branch B electric ball valve 514. By adjusting the opening of the compressed air branch A shut-off valve 512, the compressed air pressure is controlled to be between 0.2 and 0.4 MPa.

[0067] A further preferred technical solution is that the ignition units 5 are in two groups, one group at a time, and the two groups are symmetrically distributed. As the temperature requirements continue to increase, it is feasible to add two more symmetrical ignition units 5.

[0068] Example 2

[0069] Please refer to Figure 1-10The difference between this embodiment and Embodiment 1 is that the filter element cleaning mechanism includes a mounting frame 5402, which is fixed in the middle of the filter element 5401. A vertical rotating shaft 5403 is rotatably mounted on the mounting frame 5402. A cleaning brush 5404 is fixed at the bottom end of the vertical rotating shaft 5403 and contacts the bottom end of the filter element 5401. A horizontal rotating shaft 5406 is mounted on the oil filter 54. One end of the horizontal rotating shaft 5405 extends into the mounting frame 5402 and is fixed with a first bevel gear 5407. The other end of the horizontal rotating shaft 5405 is fixed with a spur gear 5406. A second bevel gear 5408 is fixed at the top end of the vertical rotating shaft 5403 and meshes with the first bevel gear 5407. A rack 5501 is also fixed at the output end of the pusher 55 and meshes with the spur gear 5406.

[0070] The pusher 55 can drive the rack 5501 to move up and down, and then the rack 5501 can mesh with the spur gear 5406 to drive the horizontal rotating shaft 5406 to rotate. Then, the second bevel gear 5408 meshes with the first bevel gear 5407 to drive the cleaning brush 5404 to move relative to the filter element 5401, thereby actively cleaning the filter element 5401, preventing the filter element 5401 from being blocked, and improving the filtration efficiency of the filter element 5401.

[0071] Example 3

[0072] Please refer to Figure 1-10 The difference between this embodiment and embodiment 2 is that a rotary motor 5409 is fixed on the outer wall of the oil filter 54 away from the rack 5501. A threaded rod 5410 is fixed on the output shaft of the rotary motor 5409. A horizontal movable bracket 5411 is installed on the outer thread of the threaded rod 5410. Two oil passage baffles 5412 are fixed on the side of the horizontal movable bracket 5411 near the oil filter 54. Both oil passage baffles 5412 extend movably into the interior of the oil filter 54. The two oil passage baffles 5412 are used to block the oil passage outlet and oil passage inlet of the oil filter 54, respectively. The rotary motor 5409 can drive the threaded rod 5410 to rotate, thereby driving the horizontal movable bracket 5411 to move horizontally, and then driving the oil passage baffles 5412 to move horizontally to control the closure of the oil passage outlet and oil passage inlet. When the flushing liquid is introduced to flush the filter element 5401, the oil passage outlet and oil passage inlet can be sealed to prevent cleaning wastewater from entering other locations.

[0073] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0074] In this invention, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," "link," and "fix" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0075] The control method of this invention is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The power supply is also common knowledge in the art. Furthermore, since this invention is mainly used to protect mechanical devices, the control method and circuit connection will not be explained in detail here.

[0076] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A symmetrically arranged air chamber ignition system for a circulating fluidized bed boiler, comprising hot air pipelines, fuel pipelines, compressed air pipelines, and an ignition unit (5), characterized in that, The hot air pipeline, fuel pipeline, and compressed air pipeline are respectively connected to the ignition unit (5), and the ignition unit (5) is connected to the primary air chamber (4) of the boiler. The ignition unit (5) includes an oil circuit branch pipe (51), an oil circuit electric ball valve (52), an oil circuit branch pipe shut-off valve (53), an oil filter (54), a propeller (55), a flame detector (56), a burner (57), an igniter (58), a hot air interface (59), an ignition tube (510), a compressed air branch pipe A-2 (511), a compressed air branch pipe A shut-off valve (512), a compressed air branch pipe B check valve (513), a compressed air branch pipe B electric ball valve (514), a compressed air branch pipe A-1 (515), and a compressed air branch pipe B (516). The oil circuit branch pipe shut-off valve (53) is located near the burner (57). The igniter (58) is inserted into the interior of the ignition tube (510) through the through hole, and the top and bottom ends of the igniter (58) are respectively fixed with an upper sealing baffle (5801) and a lower sealing baffle (5802). The oil filter (54) has a filter element (5401) fixed inside. The outer wall of the oil filter (54) is connected to a flushing inlet pipe (517) and a flushing outlet pipe (518). The flushing inlet pipe (517) is connected to the top of the filter element (5401), and the flushing outlet pipe (518) is connected to the bottom of the filter element (5401). The oil filter (54) is also equipped with a filter element cleaning mechanism. The filter element cleaning mechanism includes a mounting bracket (5402) fixed in the middle of the filter element (5401). A vertical rotating shaft (5403) is rotatably mounted on the mounting bracket (5402). A cleaning brush (5404) is fixed to the bottom end of the vertical rotating shaft (5403), and the cleaning brush (5404) contacts the bottom end of the filter element (5401). A horizontal rotating shaft (5405) is mounted on the oil filter (54). One end of the horizontal rotating shaft (5405) extends into the mounting bracket (5402) and is fixed with a first bevel gear (5407). A spur gear (5406) ​​is fixed to the other end of the horizontal rotating shaft (5405). A second bevel gear (5408) is fixed to the top end of the vertical rotating shaft (5403). The second bevel gear (5408) and the first bevel gear (5407) are connected. The output end of the pusher (55) is also fixed with a rack (5501), which meshes with the spur gear (5406); A rotary motor (5409) is fixed on the outer wall of the oil filter (54) away from the rack (5501). A threaded rod (5410) is fixed on the output shaft of the rotary motor (5409). A horizontal movable bracket (5411) is installed on the outer thread of the threaded rod (5410). Two oil passage baffles (5412) are fixed on the side of the horizontal movable bracket (5411) close to the oil filter (54). Both oil passage baffles (5412) extend into the interior of the oil filter (54). The two oil passage baffles (5412) are used to block the oil passage outlet and oil passage inlet of the oil filter (54) respectively.

2. The symmetrically arranged air chamber ignition system for a circulating fluidized bed boiler according to claim 1, characterized in that: The hot air pipeline includes a hot air inlet pipe (1), a distribution fan (2), and a hot air outlet pipe (3). The hot air inlet pipe (1) and the hot air outlet pipe (3) are respectively connected to the inlet and outlet of the distribution fan (2), and the hot air outlet pipe (3) is connected to the ignition unit (5).

3. The symmetrically arranged air chamber ignition system for a circulating fluidized bed boiler according to claim 1, characterized in that: The fuel pipeline is led from the oil storage tank, with one end connected to the oil storage tank and the other end connected to the ignition unit (5). The oil pressure of the fuel pipeline is controlled at 2.0-3.0 MPa.

4. The symmetrically arranged air chamber ignition system for a circulating fluidized bed boiler according to claim 1, characterized in that: The compressed air pipeline is drawn from the air compressor. One end is connected to the air compressor, and the other end is distributed to each ignition unit (5). The compressed air distributed to the ignition unit (5) is divided into two paths. One path is used to purge the ignition channel and also as atomizing air. The other path is used to purge the oil circuit before ignition.

5. The symmetrically arranged air chamber ignition system for a circulating fluidized bed boiler according to claim 1, characterized in that: The oil filter (54) is located between the oil circuit branch pipe shut-off valve (53) and the burner (57).

6. The symmetrically arranged air chamber ignition system for a circulating fluidized bed boiler according to claim 1, characterized in that: The flame detector (56) is installed on the ignition unit (5), and the other end is connected to the control and display unit.

7. The method for implementing the symmetrically arranged air chamber ignition system of a circulating fluidized bed boiler according to any one of claims 1-6, characterized in that, Includes the following steps: S1. Check whether all valves in the ignition system are tightly closed, and whether the electric ball valve (52) in the oil circuit and the electric ball valve (514) in the compressed air branch B are connected to power and respond normally. S2. Check and confirm that there is no oil inside the ignition system. Use the pusher (55) to pull out the igniter (58) and conduct an ignition test to confirm that the igniter is igniting normally. S3. Then push the igniter (58) into the ignition tube (510) and start the oil pump to adjust the oil pressure to reach the ignition oil pressure. S4. Close the main oil line shut-off valve (9), the electric ball valve (52) of the oil line, and the shut-off valve (53) of the branch oil line. Open the main compressed air shut-off valve (6) and the electric ball valve (514) of the compressed air branch B. By adjusting the opening of the one-way valve (513) of the compressed air branch B and the shut-off valve (512) of the compressed air branch A, purge the oil line and the igniter for the first time. S5. Open the main oil circuit shut-off valve (9) and the electric ball valve (52) of the oil circuit, adjust the opening of the branch oil circuit shut-off valve (53) and the compressed air branch A shut-off valve (512) to conduct an atomization experiment. S6. Use the pusher (55) to push the igniter (58) into the ignition tube (510), turn on the air distribution fan (2), then open the oil main shut-off valve (9), the oil electric ball valve (52), and the compressed air branch B electric ball valve (514), press the ignition button to make the igniter (58) generate a spark, adjust the opening of the compressed air branch A shut-off valve (512) and the oil branch shut-off valve (53), and you can observe that it ignites immediately. If the ignition fails, immediately close the oil branch shut-off valve (53), stop the oil supply, and use hot air to blow the air chamber. After checking that there are no abnormalities, ignite again. After successful ignition, remove the igniter (58) and control the temperature to rise slowly. S7. After ignition, close the main oil pipe shut-off valve (9), the electric ball valve (52) and the branch oil pipe shut-off valve (53), and keep the main compressed air shut-off valve (6), the branch compressed air A shut-off valve (512), the one-way valve (513) of the branch compressed air B and the electric ball valve (514) of the branch compressed air B open to complete the secondary purging of the oil pipe and ignition cylinder. S8. After completing step S7 above, close all remaining valves, the compressed air system will exit, and the ignition system will exit.

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