An online cleaning device for ash accumulation in flues

Abstract

This utility model discloses an online cleaning device for ash accumulation in flue gas ducts, comprising a closed housing. The left side wall of the housing has a through-hole for a front rack and a through-hole for a rear rack. A front rack is also installed inside the housing, extending laterally through the through-hole to the left and out of the housing. A rear rack is also installed inside the housing, extending laterally through the through-hole to the left and out of the housing. A purge grid unit is installed between the front and rear racks, and the purge grid unit can move laterally under the action of the front and rear racks. The device also includes a primary hot air header connected to the purge grid unit. This utility model's device can efficiently move and purge ash accumulation in flue gas ducts, preventing excessive ash buildup. It also effectively reduces the manpower and material resources required for maintenance, reduces safety risks during the operation and maintenance of coal-fired boilers, maintains the combustion efficiency of coal-fired boilers, and is beneficial for energy conservation and environmental protection.

Description

Technical Field

[0001] This utility model belongs to the field of coal-fired boiler combustion technology, and relates to flue gas ducts, specifically to an online ash cleaning device for flue gas ducts. Background Technology

[0002] Coal-fired boilers have always played a leading role in ensuring the grid's safety net, and the opposed-wall combustion system is the primary method used in 600MW and 1000MW coal-fired boilers. In this system, the secondary air box is a crucial component. The secondary air box (i.e., the flue gas duct) collects the air needed for combustion, ensuring it is evenly distributed through each burner into the furnace, where it mixes with pulverized coal to complete the combustion process. However, in actual operation, due to gaps in the air preheater and other factors, dust frequently accumulates in the flue gas duct. This accumulation causes blockages in the secondary airflow, leading to uneven distribution of secondary air into the furnace and reduced boiler combustion efficiency. Furthermore, the increased weight of ash in the flue gas duct can overload the existing load-bearing structure, posing a serious safety hazard.

[0003] Currently, when power plants shut down for maintenance, they often use manual labor to clean the ash buildup in the flue gas ducts, which consumes a lot of manpower and resources and is prone to causing personal safety accidents.

[0004] Therefore, it is necessary to develop an online cleaning device for flue gas duct ash accumulation to solve the problem of flue gas duct ash accumulation and achieve safe and efficient operation. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide an online cleaning device for ash accumulation in flue gas ducts, so as to solve the technical problem that the safety and efficiency of ash accumulation in flue gas ducts need to be further improved in the existing technology.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] An online cleaning device for ash accumulation in flue gas ducts includes a closed housing. The left side wall of the housing is a detachable side wall, and a plurality of burner through holes are evenly distributed on the rear side wall of the housing, with a burner installed in each burner through hole.

[0008] The left side wall of the box has a through hole for a front rack near the bottom, and a front rack is also provided inside the box near the front side wall. The front rack is arranged horizontally and extends to the outside of the box through the through hole. The front rack can also move horizontally relative to the box.

[0009] The rear side of the left side wall of the box has a through hole for the rear rack that passes through the left side wall. A rear rack is also provided inside the box near the rear side wall. The rear rack is arranged horizontally and extends to the left through the through hole to the outside of the box. The rear rack can also move horizontally relative to the box.

[0010] A purge grid unit is provided between the front rack and the rear rack, and the purge grid unit can move laterally under the drive of the front rack and the rear rack.

[0011] The left side wall of the enclosure is also provided with a main pipe through hole that penetrates the left side wall. A hot primary air main pipe is installed in the main pipe through hole, and the hot primary air main pipe is connected to the blowing grid unit.

[0012] This utility model also has the following technical features:

[0013] Preferably, a front main gear is also provided on the outer side of the left side wall of the housing. The front main gear can be driven by the output shaft of the front main gear motor. The front main gear is located on the front side of the front rack and can also mesh with and drive the front rack.

[0014] The outer side of the left side wall of the housing is also provided with a rear main gear, which can be driven by the output shaft of the rear main gear motor. The rear main gear is located on the rear side of the rear rack and can also mesh with and drive the rear rack.

[0015] Preferably, the housing is further provided with a plurality of front driven gears along the front sidewall. The plurality of front driven gears are evenly distributed in the transverse direction. Each front driven gear is located between the inner side of the front sidewall of the housing and the front rack, and each front driven gear meshes with the front rack.

[0016] The housing is equipped with multiple driven gears along the rear sidewall. These driven gears are evenly distributed laterally. Each driven gear is located between the inner sidewall of the housing and the rear rack, and each driven gear meshes with the rear rack.

[0017] Specifically, an external bracket is provided on the outside of the housing, and the front main gear motor and the rear main gear motor are mounted on the external bracket; the left side of the front rack and the rear rack are mounted on the limiting mounting holes on the external bracket for longitudinal and vertical limiting, and the front rack and the rear rack can reciprocate laterally in the limiting groove; an internal bracket is fixedly provided on the inner wall of the housing, and multiple front driven gears and multiple rear driven gears can be rotatably mounted on the internal bracket.

[0018] Specifically, the purge grid unit includes a front main air duct that is closed at both ends. The front main air duct is arranged parallel to the rear side of the front rack. The front main air duct also has an air inlet on its side wall and multiple air outlets on its rear side wall. The multiple air outlets are evenly distributed along the front main air duct.

[0019] The box is also equipped with a first metal flexible hose. One end of the first metal flexible hose is connected to the port of the hot primary air main pipe inside the box, and the other end of the first metal flexible hose is connected to the air inlet of the front main air pipe.

[0020] Preferably, the blowing grid unit further includes a rear main air duct closed at both ends. The rear main air duct is arranged parallel to the front side of the rear rack. A rear main air duct inlet is opened on the side wall of the rear main air duct, and a plurality of rear main air duct outlets are also opened on the front side wall of the rear main air duct. The plurality of rear main air duct outlets are evenly distributed along the rear main air duct.

[0021] The box is also equipped with a second metal flexible hose. One end of the second metal flexible hose is connected to the port of the hot primary air main pipe inside the box, and the other end of the second metal flexible hose is connected to the air inlet of the rear main air pipe.

[0022] Preferably, multiple secondary air ducts are evenly distributed in the transverse direction between the front main air duct and the rear main air duct. The secondary air ducts, the air outlets of the front main air duct and the air outlets of the rear main air duct are in one-to-one correspondence. Each secondary air duct is arranged in the longitudinal direction. One end of each secondary air duct is fixedly connected to and communicates with the air outlet of the front main air duct, and the other end of each secondary air duct is fixedly connected to and communicates with the air outlet of the rear main air duct.

[0023] Each of the secondary air ducts is also provided with multiple air outlets, which are evenly distributed along the longitudinal direction. Each air outlet is also connected to a hot primary air nozzle on its outer side.

[0024] Compared with the prior art, the present invention has the following beneficial technical effects:

[0025] (I) The device in this utility model can efficiently move and blow away the ash in the flue, avoid excessive ash accumulation, and effectively reduce the manpower and material resources required for maintenance, reduce the safety risks in the operation and maintenance of coal-fired boilers, maintain the combustion efficiency of coal-fired boilers, and is beneficial to energy conservation and environmental protection.

[0026] (II) The device in this utility model can make the blowing grid unit move horizontally in the flue under the synchronous drive of the front main gear motor and the rear main gear motor, and use hot primary air nozzles to blow the accumulated ash in the flue at high speed. Compared with a fixed blowing grid unit, under the premise that the total blowing air volume and the hot primary air nozzle layout density are the same, the flow rate of hot primary air at the outlet of the hot primary air nozzle is increased to 2 to 3 times the original, which effectively improves the ability to blow the accumulated ash.

[0027] (III) The device in this utility model can move the purging grid unit horizontally to the outside of the flue gas duct by synchronously driving the front rack and the rear rack through the front main gear motor and the rear main gear motor during the maintenance of the coal-fired boiler. The staff can then clean the blockage of the purging grid unit and clean and replace the hot primary air nozzles, thus meeting the safe and efficient operation requirements of the coal-fired boiler. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the internal perspective structure of the device of this utility model.

[0029] Figure 2 This is a schematic diagram of the main structure of the device of this utility model.

[0030] Figure 3 This is a schematic diagram of the left-side structure of the device of this utility model.

[0031] Figure 4 This is a top view of the device of this utility model.

[0032] The meanings of the labels in the diagram are as follows: 1-box body, 2-burner, 3-front rack, 4-rear rack, 5-purge grid unit, 6-hot primary air header, 7-front main gear, 8-front main gear motor, 9-rear main gear, 10-rear main gear motor, 11-front driven gear, 12-rear driven gear, 13-first metal hose, 14-second metal hose.

[0033] 101-Burner through hole, 102-Front rack through hole, 103-Main pipe through hole, 104-Rear rack through hole.

[0034] 501 - Front main air duct, 502 - Rear main air duct, 503 - Secondary air duct, 504 - Air outlet, 505 - Hot primary air nozzle.

[0035] 50101 - Front main air duct inlet, 50102 - Front main air duct outlet.

[0036] 50201 - Rear main air duct inlet, 50202 - Rear main air duct outlet.

[0037] The specific content of this utility model will be further explained in detail below with reference to the embodiments. Detailed Implementation

[0038] It should be noted that, unless otherwise specified, all equipment and components in this utility model are based on existing technologies. For example, the metal hoses used are known metal hoses.

[0039] In this invention, the coordinate system OXYZ is a known three-dimensional rectangular coordinate system; the X-axis is horizontal and points to the right; the Y-axis is vertical and points forward; and the Z-axis is vertical and points upward.

[0040] In this utility model, the flue gas duct refers to the secondary air box; online cleaning of the ash accumulation in the flue gas duct refers to the online cleaning of the ash accumulation in the secondary air box.

[0041] Following the above technical solution, the following are specific embodiments of this utility model. It should be noted that this utility model is not limited to the following specific embodiments, and all equivalent modifications made based on the technical solution of this application fall within the protection scope of this utility model.

[0042] Example:

[0043] This embodiment provides an online cleaning device for dust accumulation in flues, such as... Figure 1 As shown, the enclosure includes a closed box 1. The left side wall of the box 1 is a detachable side wall. Multiple burner through holes 101 are evenly distributed on the rear side wall of the box 1, and a burner 2 is installed in each burner through hole 101.

[0044] like Figure 1 As shown, a front rack through hole 102 is provided on the front side of the left side wall of the housing 1 near the bottom. A front rack 3 is also provided inside the housing 1 near the front side wall. The front rack 3 is arranged horizontally and extends to the outside of the housing 1 through the front rack through hole 102. The front rack 3 can also move horizontally relative to the housing 1.

[0045] like Figure 1 As shown, a rear rack through hole 104 is provided on the rear side of the left side wall of the housing 1 near the bottom. A rear rack 4 is also provided inside the housing 1 near the rear side wall. The rear rack 4 is arranged in a horizontal direction and extends to the left outside the housing 1 through the rear rack through hole 104. The rear rack 4 can also move horizontally relative to the housing 1.

[0046] like Figure 1 As shown, a purge grid unit 5 is provided between the front rack 3 and the rear rack 4. The purge grid unit 5 can move laterally under the drive of the front rack 3 and the rear rack 4.

[0047] like Figure 2As shown, a main pipe through hole 103 is also provided on the left side wall of the housing 1, and a hot primary air main pipe 6 is provided in the main pipe through hole 103. The hot primary air main pipe 6 is connected to the blowing grid unit 5.

[0048] In this embodiment, the simultaneous movement of the front rack 3 and the rear rack 4 can drive the blowing grid unit 5 to move laterally on the horizontal plane, and blow the accumulated ash in the box 1 horizontally. The blown-up ash and secondary air are mixed in the box 1 and then enter the furnace through the burner 2, and are then removed by the electrostatic precipitator.

[0049] As a preferred embodiment of this invention, such as Figure 3 As shown, a front main gear 7 is also provided on the outer side of the left side wall of the housing 1. The front main gear 7 can be driven by the output shaft of the front main gear motor 8. The front main gear 7 is located on the front side of the front rack 3, and the front main gear 7 can also mesh with and drive the front rack 3.

[0050] like Figure 3 As shown, a rear main gear 9 is also provided on the outer side of the left side wall of the housing 1. The rear main gear 9 can be driven by the output shaft of the rear main gear motor 10. The rear main gear 9 is located on the rear side of the rear rack 4, and the rear main gear 9 can also mesh with and drive the rear rack 4.

[0051] As a preferred embodiment of this invention, such as Figure 4 As shown, a plurality of driven gears 11 are also arranged along the front sidewall inside the housing 1. The plurality of driven gears 11 are evenly distributed in the transverse direction. Each driven gear 11 is located between the inner side of the front sidewall of the housing 1 and the front rack 3. Each driven gear 11 meshes with the front rack 3.

[0052] like Figure 4 As shown, a plurality of rear driven gears 12 are also arranged along the rear side wall inside the housing 1. The plurality of rear driven gears 12 are evenly distributed in the transverse direction. Each rear driven gear 12 is located between the inner side of the rear side wall of the housing 1 and the rear rack 4, and each rear driven gear 12 meshes with the rear rack 4.

[0053] As a preferred embodiment, an external bracket is provided on the outside of the housing 1, and the front main gear motor 8 and the rear main gear motor 10 are mounted on the external bracket; the left side of the front rack 3 and the rear rack 4 are mounted on the limiting mounting holes on the external bracket for longitudinal and vertical limiting, and the front rack 3 and the rear rack 4 can reciprocate laterally in the limiting groove; an internal bracket is fixedly provided on the inner wall of the housing 1, and multiple front driven gears 11 and multiple rear driven gears 12 can be rotatably mounted on the internal bracket.

[0054] As a preferred embodiment of this invention, such as Figure 4As shown, the blowing grid unit 5 includes a front main air duct 501 closed at both ends. The front main air duct 501 is arranged parallel to the rear side of the front rack 3. The side wall of the front main air duct 501 is also provided with a front main air duct inlet hole 50101. The rear side wall of the front main air duct 501 is also provided with a plurality of front main air duct outlet holes 50102. The plurality of front main air duct outlet holes 50102 are evenly distributed along the front main air duct 501.

[0055] like Figure 4 As shown, a first metal flexible hose 13 is also provided inside the housing 1. One end of the first metal flexible hose 13 is connected to the port of the hot primary air main pipe 6 inside the housing 1, and the other end of the first metal flexible hose 13 is connected to the air inlet 50101 of the front main air pipe.

[0056] As a preferred embodiment of this invention, such as Figure 4 As shown, the blowing grid unit 5 also includes a rear main air duct 502 that is closed at both ends. The rear main air duct 502 is arranged parallel to the front side of the rear rack 4. The side wall of the rear main air duct 502 has a rear main air duct inlet hole 50201. The front side wall of the rear main air duct 502 also has multiple rear main air duct outlet holes 50202. The multiple rear main air duct outlet holes 50202 are evenly distributed along the rear main air duct 502.

[0057] like Figure 4 As shown, a second metal flexible hose 14 is also provided inside the housing 1. One end of the second metal flexible hose 14 is connected to the port of the hot primary air main pipe 6 inside the housing 1, and the other end of the second metal flexible hose 14 is connected to the air inlet 50201 of the rear main air pipe.

[0058] As a preferred embodiment of this invention, such as Figure 1 As shown, multiple secondary air ducts 503 are evenly distributed horizontally between the front main air duct 501 and the rear main air duct 502. The secondary air ducts 503, the air outlets 50102 and 50202 of the front main air duct are in one-to-one correspondence. Each secondary air duct 503 is arranged vertically. One end of each secondary air duct 503 is fixedly connected to and communicates with the air outlet 50102 of the front main air duct, and the other end of each secondary air duct 503 is fixedly connected to and communicates with the air outlet 50202 of the rear main air duct.

[0059] like Figure 1 As shown, each secondary air duct 503 is also provided with multiple air outlets 504, which are evenly distributed along the longitudinal direction. Each air outlet 504 is also connected to a hot primary air nozzle 505 on its outer side.

[0060] In this embodiment, the front main air duct 501 is fixed to the front rack 3 by a clamp.

[0061] In this embodiment, the rear main air duct 502 is fixed to the rear rack 4 by a clamp.

[0062] In this embodiment, the card sleeve is a commonly used card sleeve known in the prior art.

[0063] In this embodiment, the front main air duct 501, the rear main air duct 502, and the secondary air duct 503 are all made of 316L stainless steel.

[0064] In this embodiment, the device uses hot primary air as the purging air source. When the air velocity at the outlet of the hot primary air nozzle is 8 m / s, dust particles with diameters of 5 μm, 50 μm, 100 μm, 300 μm, 500 μm, 1000 μm, 1500 μm, and 2000 μm can be blown up and carried into the furnace along with the secondary air. Simultaneously, calculations show that the inlet flow rate of the hot primary air entering the flue gas duct at high load is 0.45 kg / s, which, compared to the secondary air flow rate of 60 kg / s, accounts for only 0.75%, having virtually no impact on the secondary air.

[0065] In this embodiment, when the device is in use, the front main gear motor 8 and the rear main gear motor 10 are first started, so that the front main gear 7 and the rear main gear 9 rotate synchronously under the synchronous drive of the two motors. The front main gear 7 drives the front rack 3 to move, and at the same time the rear main gear 9 drives the rear rack 4 to move. Under the synchronous movement of the front rack 3 and the rear rack 4, the blowing grid unit 5 is driven to move horizontally in the box 1. After reaching the set position, hot primary air is sprayed out from the hot primary air nozzle 505 to blow away the new dust accumulation in the box 1 at high speed. After the blowing is completed, the main gear motor 8 and the rear main gear motor 10 are started again to perform cyclic blowing in the box 1.

[0066] During the overhaul of the coal-fired boiler, the left side wall of the housing 1 is removed, the front main gear motor 8 and the rear main gear motor 10 are started, the purge grid unit 5 is moved to the outside of the housing 1, and the technicians clear the blockage of the purge grid unit 5 and clean and replace the hot primary air nozzle 505.

Claims

1. An online cleaning device for ash accumulation in flue gas ducts, comprising a closed housing (1), wherein the left side wall of the housing (1) is a detachable side wall, and a plurality of burner through holes (101) are evenly distributed on the rear side wall of the housing (1), wherein a burner (2) is provided in each burner through hole (101), characterized in that: The left side wall of the box (1) has a through hole (102) for the front rack that passes through the left side wall near the bottom. The box (1) also has a front rack (3) near the front side wall. The front rack (3) is arranged in the horizontal direction and extends to the outside of the box (1) through the through hole (102). The front rack (3) can also move in the horizontal direction relative to the box (1). The rear side of the left side wall of the box (1) is provided with a through hole (104) for the rack through the left side wall. A rack (4) is also provided inside the box (1) near the rear side wall. The rack (4) is arranged in the horizontal direction and extends to the left through the rack through hole (104) to the outside of the box (1). The rack (4) can also move in the horizontal direction relative to the box (1). A purge grid unit (5) is provided between the front rack (3) and the rear rack (4), and the purge grid unit (5) can move laterally under the drive of the front rack (3) and the rear rack (4); The box body (1) is also provided with a main pipe through hole (103) that penetrates the left side wall. A hot primary air main pipe (6) is provided in the main pipe through hole (103). The hot primary air main pipe (6) is connected to the blowing grid unit (5).

2. The on-line soot cleaning device for a flue gas duct of a boiler according to claim 1, characterized in that, The outer side of the left side wall of the box (1) is also provided with a front main gear (7). The front main gear (7) can be driven by the output shaft of the front main gear motor (8). The front main gear (7) is located on the front side of the front rack (3). The front main gear (7) can also mesh and drive the front rack (3). The outer side of the left side wall of the housing (1) is also provided with a rear main gear (9). The rear main gear (9) can be driven by the output shaft of the rear main gear motor (10). The rear main gear (9) is located on the rear side of the rear rack (4). The rear main gear (9) can also mesh with and drive the rear rack (4).

3. The on-line soot cleaning device for a flue gas duct of a boiler according to claim 2, characterized in that, The housing (1) is provided with a plurality of front driven gears (11) along the front sidewall. The plurality of front driven gears (11) are evenly distributed in the transverse direction. Each front driven gear (11) is located between the inner side of the front sidewall of the housing (1) and the front rack (3). Each front driven gear (11) meshes with the front rack (3). The housing (1) is provided with a plurality of rear driven gears (12) along the rear side wall. The plurality of rear driven gears (12) are evenly distributed in the transverse direction. Each rear driven gear (12) is located between the inner side of the rear side wall of the housing (1) and the rear rack (4). Each rear driven gear (12) meshes with the rear rack (4).

4. The on-line soot cleaning device for a flue gas duct of a boiler according to claim 3, characterized in that, The housing (1) is provided with an external support, and the front main gear motor (8) and the rear main gear motor (10) are mounted on the external support; the left side of the front rack (3) and the rear rack (4) are mounted on the limiting mounting holes on the external support for longitudinal and vertical limiting, and the front rack (3) and the rear rack (4) can reciprocate in the limiting groove along the transverse direction; an internal support is fixedly provided on the inner wall of the housing (1), and multiple front driven gears (11) and multiple rear driven gears (12) can be rotatably mounted on the internal support.

5. The on-line soot cleaning device for a flue gas duct of a boiler according to claim 1, wherein The blow-out grid unit (5) includes a front main air duct (501) closed at both ends. The front main air duct (501) is arranged parallel to the rear side of the front rack (3). The side wall of the front main air duct (501) is also provided with a front main air duct inlet (50101). The rear side wall of the front main air duct (501) is also provided with multiple front main air duct outlets (50102). The multiple front main air duct outlets (50102) are evenly distributed along the front main air duct (501). The box (1) is also equipped with a first metal hose (13). One end of the first metal hose (13) is connected to the port of the hot primary air main pipe (6) inside the box (1), and the other end of the first metal hose (13) is connected to the air inlet (50101) of the front main air pipe.

6. The on-line soot cleaning device for a flue gas duct of a boiler according to claim 5, wherein The purge grid unit (5) also includes a rear main air duct (502) closed at both ends. The rear main air duct (502) is arranged parallel to the front side of the rear rack (4). The side wall of the rear main air duct (502) is provided with a rear main air duct inlet (50201). The front side wall of the rear main air duct (502) is also provided with multiple rear main air duct outlets (50202). The multiple rear main air duct outlets (50202) are evenly distributed along the rear main air duct (502). The box (1) is also equipped with a second metal hose (14). One end of the second metal hose (14) is connected to the port of the hot primary air main pipe (6) inside the box (1), and the other end of the second metal hose (14) is connected to the air inlet (50201) of the rear main air pipe.

7. The on-line soot cleaning device for a flue gas duct of a fossil fuel fired boiler as set forth in claim 6, wherein Multiple secondary air ducts (503) are evenly distributed in the transverse direction between the front main air duct (501) and the rear main air duct (502). The secondary air ducts (503), the air outlets (50102) of the front main air duct and the air outlets (50202) of the rear main air duct are in one-to-one correspondence. Each secondary air duct (503) is arranged in the longitudinal direction. One end of each secondary air duct (503) is fixedly connected to and communicates with the air outlet (50102) of the front main air duct. The other end of each secondary air duct (503) is fixedly connected to and communicates with the air outlet (50202) of the rear main air duct. Each of the secondary air ducts (503) is also provided with multiple air outlets (504), which are evenly arranged along the longitudinal direction. Each air outlet (504) is also connected to a hot primary air nozzle (505) on its outer side.

Images