A high-temperature and high-viscosity dust-containing flue gas anti-blocking device for a waste heat boiler

Abstract

The application discloses a high-temperature and high-viscosity dust-containing flue gas anti-blocking device of a waste heat boiler and relates to the technical field of waste heat boilers. The device comprises a supporting frame, an anti-blocking mechanism is arranged on a waste heat boiler mechanism, the anti-blocking mechanism comprises a water tank, a steam generator is arranged on the top of the water pump body, an electromagnetic valve is installed at the output end of the third connecting pipe, a one-way valve is installed at the output end of the electromagnetic valve, two symmetrical sealing plates are fixed to the outer surface of the rotating rod, a motor is installed on the inner wall of the rectangular hole, a controller is installed on the surface of the mounting plate, a spray head is installed in each cylindrical hole, the device can remove the sticky dust at the elbow for flue gas in the shell, effectively ensures the flue gas ventilation of the waste heat boiler, avoids the blockage of the waste heat boiler, and improves the use effect of the waste heat boiler.

Description

Technical Field

[0001] This invention relates to the field of waste heat boiler technology, specifically to a device for preventing blockage of high-temperature, high-viscosity, dust-laden flue gas in waste heat boilers. Background Technology

[0002] Waste heat boilers are boilers that use the residual heat from waste gas, waste materials, or waste liquid in various industrial processes, as well as the heat generated by the combustion of combustible substances, to heat water to a certain temperature. Waste heat boilers are classified according to fuel type, such as oil-fired waste heat boilers, gas-fired waste heat boilers, coal-fired waste heat boilers, and external heat boilers; and according to application type, such as waste heat hot water boilers, waste heat steam boilers, and waste heat organic heat carrier boilers.

[0003] While existing waste heat boilers can recover and reuse waste heat from flue gas to save resources, they often experience blockages when recovering waste heat from high-temperature, high-viscosity, dust-laden flue gas. This is mainly because the anti-blocking mechanisms of some existing waste heat boilers are mostly mechanical vibration and sonic cleaning, which can only clean dry, loose dust, thus reducing the efficiency of the waste heat boiler.

[0004] Therefore, a novel anti-clogging device for high-temperature, high-viscosity, dust-laden flue gas from waste heat boilers is needed to solve the problems mentioned above. Summary of the Invention

[0005] The purpose of this invention is to provide an anti-clogging device for high-temperature, high-viscosity dust-laden flue gas in waste heat boilers, in order to solve the problem that most of the existing anti-clogging mechanisms equipped in some waste heat boilers are mechanical vibration and sonic cleaning, and these anti-clogging mechanisms can only clean dry and loose dust, but cannot recover waste heat from high-temperature, high-viscosity dust-laden flue gas, which leads to a reduction in the efficiency of waste heat boilers.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a device for preventing blockage of high-temperature, high-viscosity, dust-laden flue gas from a waste heat boiler, comprising a support frame, a waste heat boiler mechanism mounted on the support frame, and an anti-blockage mechanism mounted on the waste heat boiler mechanism; The anti-clogging mechanism includes a water tank. The top of the water tank is equipped with a water pump body, a rectangular groove, a rectangular hole, and a mounting plate. A first connecting pipe is installed at the input end of the water pump body, and a second connecting pipe is installed at the output end. A steam generator is located on the top of the water pump body, and a third connecting pipe is installed at the output end of the steam generator. A solenoid valve is installed at the output end of the third connecting pipe, and a one-way valve is installed at the output end of the solenoid valve. A multi-port pipe is installed at the output end of the one-way valve. A rotating rod is rotatably connected inside the rectangular groove, and two symmetrical sealing plates are fixed to the outer surface of the rotating rod. A motor is installed on the inner wall of the rectangular hole, and the output end of the motor is connected to one end of the rotating rod. A controller is installed on the surface of the mounting plate. Multiple cylindrical holes are equidistantly distributed at the top of the inner wall of the rectangular groove, and a nozzle is installed inside each cylindrical hole.

[0007] Preferably, the input end of the first connecting pipe is located near the bottom of the water tank, the output end of the second connecting pipe is connected to the input end of the steam generator, the surfaces of both sealing plates are in contact with the inner wall of the rectangular groove, the bottom of the water tank 301 is on the same horizontal plane as the bottom of the support frame 1, and the input end of each nozzle is connected to each output end of the multi-port pipe.

[0008] Preferably, the mounting plate is fixed on the support frame, the controller is electrically connected to the water pump body, the controller is electrically connected to the steam generator, the controller is electrically connected to the solenoid valve, and the controller is electrically connected to the motor.

[0009] Preferably, the top of the water tank is provided with a tank cover, the input end of the first connecting pipe movably passes through the top of the tank cover, the water pump body is installed on the top of the tank cover, the top of the tank cover is provided with an installation hole, and a dustproof net is installed at the opening of the installation hole.

[0010] Preferably, the waste heat boiler mechanism includes a shell, the rectangular groove is opened on the top of the inner wall of the shell, the rectangular hole is opened on the top of the shell, the shell is fixed inside the support frame, two dust collection shells are fixed at the bottom of the shell, an air inlet pipe is fixedly inserted through one side of the shell near the bottom, and an air outlet pipe is fixedly inserted through the other side of the shell near the top.

[0011] Preferably, an economizer is provided inside the housing, with both the input and output ends of the economizer fixedly penetrating the top of the inner wall of the housing, and an evaporator is provided inside the housing, with both the input and output ends of the evaporator fixedly penetrating one side of the housing.

[0012] Preferably, a superheater is provided inside the shell, and the evaporator is located between the economizer and the superheater. The input and output ends of the superheater are both fixedly inserted through the top of the inner wall of the shell.

[0013] Preferably, a connecting block is fixed to one side of the housing, a circulating water pump is installed on the surface of the connecting block, a boiler drum is installed on the top of the housing, and the output end of the circulating water pump is connected to the input end of the evaporator.

[0014] Preferably, the output end of the evaporator is connected to one of the input ends of the boiler drum, the output end of the economizer is connected to the other input end of the boiler drum, and one of the output ends of the boiler drum is connected to the input end of the superheater.

[0015] Preferably, the output end of the circulating water pump is equipped with a water outlet pipe, the input end of the water outlet pipe is connected to another output end of the boiler drum, the bottom of each dust collection shell is equipped with a cover plate, and the controller is electrically connected to the circulating water pump.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention, by setting an anti-blocking mechanism, can remove sticky dust from the bends inside the shell used for flue gas passage, effectively ensuring the flue gas flow rate of the waste heat boiler and avoiding insufficient gas flow due to blockage, which would affect the efficiency of subsequent flue gas denitrification and desulfurization operations, thereby improving the utilization effect of the waste heat boiler. Under the action of the nozzle, the steam guided by the multi-channel pipe can be sprayed to the bends in the shell used for flue gas passage. Under the action of the motor, the two sealing plates can be rotated through the cooperation of the rotating rod. Under the action of the dustproof net, the dust in the environment can be prevented from passing through the inside of the mounting hole and entering the inside of the water tank. Under the action of the controller, the start and stop operation of the circulating water pump can be controlled.

[0017] 2. This invention, by setting up a waste heat boiler mechanism, can recover and reuse the heat carried in the flue gas, thereby achieving the purpose of saving resources. Under the action of the gas outlet pipe, the steam-water mixture pumped by the circulating water pump can be guided into the interior of the boiler drum. Under the action of the evaporator, some of the water passing through it can be converted into water vapor. Under the action of the shell, the water passing through the economizer, superheater and evaporator can absorb heat from the flue gas carrying heat passing through the shell. Under the action of the circulating water pump, the steam-water mixture flowing inside the evaporator tube can be guided into the interior of the water outlet pipe. Under the action of the superheater, the saturated steam guided into the superheater can be converted into hot steam and guided out. Attached Figure Description

[0018] Figure 1 This is a perspective view of a device for preventing blockage of high-temperature, high-viscosity, dust-laden flue gas in a waste heat boiler according to the present invention. Figure 2 This is a top-view perspective view of a device for preventing blockage of high-temperature, high-viscosity, dust-laden flue gas in a waste heat boiler, according to the present invention. Figure 3 This is a partial cross-sectional view of a waste heat boiler high-temperature, high-viscosity, dust-laden flue gas anti-clogging device according to the present invention. Figure 4 This is a top view schematic diagram of the anti-clogging device for high-temperature, high-viscosity, dust-laden flue gas in a waste heat boiler according to the present invention; Figure 5 This invention relates to an anti-clogging device for high-temperature, high-viscosity, dust-laden flue gas from a waste heat boiler. Figure 2 Enlarged 3D view at point A in the middle; Figure 6 This invention relates to an anti-clogging device for high-temperature, high-viscosity, dust-laden flue gas from a waste heat boiler. Figure 3 Enlarged 3D view at point B.

[0019] In the diagram: 1. Support frame; 2. Waste heat boiler structure; 201. Shell; 202. Dust collection shell; 203. Inlet pipe; 204. Outlet pipe; 205. Economizer; 206. Evaporator; 207. Superheater; 208. Circulating water pump; 209. Water outlet pipe; 210. Boiler drum; 211. Cover plate; 3. Anti-clogging mechanism; 301. Water tank; 302. Tank cover; 303. Mounting hole; 304. Dustproof net; 305. Water pump body; 306. First connecting pipe; 307. Second connecting pipe; 308. Steam generator; 309. Third connecting pipe; 310. Solenoid valve; 311. Check valve; 312. Multi-port pipe; 313. Rectangular groove; 314. Rotating rod; 315. Rectangular hole; 316. Motor; 317. Mounting plate; 318. Controller; 319. Cylindrical hole; 320. Nozzle; 321. Sealing plate; 4. Connecting block. Detailed Implementation

[0020] 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, and 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.

[0021] Please see Figures 1-6 As shown, the present invention provides a technical solution: a device for preventing blockage of high-temperature, high-viscosity, dust-laden flue gas from a waste heat boiler, comprising a support frame 1, a waste heat boiler mechanism 2 mounted on the support frame 1, and an anti-blockage mechanism 3 mounted on the waste heat boiler mechanism 2. The anti-clogging mechanism 3 includes a water tank 301. The top of the water tank 301 is equipped with a water pump body 305, a rectangular groove 313, a rectangular hole 315, and a mounting plate 317. A first connecting pipe 306 is installed at the input end of the water pump body 305, and a second connecting pipe 307 is installed at the output end of the water pump body 305. A steam generator 308 is located on the top of the water pump body 305, and a third connecting pipe 309 is installed at the output end of the steam generator 308. A solenoid valve 310 is installed at the output end of the third connecting pipe 309, and a mounting plate 317 is installed at the output end of the solenoid valve 310. There is a one-way valve 311, and a multi-port pipe 312 is installed at the output end of the one-way valve 311. A rotating rod 314 is rotatably connected inside the rectangular groove 313. Two symmetrical sealing plates 321 are fixed on the outer surface of the rotating rod 314. A motor 316 is installed on the inner wall of the rectangular hole 315. The output end of the motor 316 is installed with one end of the rotating rod 314. A controller 318 is installed on the surface of the mounting plate 317. Multiple cylindrical holes 319 are evenly distributed at the top of the inner wall of the rectangular groove 313. A nozzle 320 is installed inside each cylindrical hole 319.

[0022] according to Figures 1-6 As shown, the input end of the first connecting pipe 306 is located near the bottom of the inside of the water tank 301, and the output end of the second connecting pipe 307 is connected to the input end of the steam generator 308. The surfaces of the two sealing plates 321 are in contact with the inner wall of the rectangular groove 313. The bottom of the water tank 301 and the bottom of the support frame 1 are on the same horizontal plane. The input end of each nozzle 320 is connected to each output end of the multi-port pipe 312, so that the steam guided by the multi-port pipe 312 can be sprayed to the bend of the shell 201 used for flue gas under the action of the nozzle 320.

[0023] according to Figures 1-6 As shown, the mounting plate 317 is fixed on the support frame 1. The controller 318 is electrically connected to the water pump body 305, the steam generator 308, the solenoid valve 310, and the motor 316, so that the two sealing plates 321 can be rotated by the motor 316 and the rotating rod 314.

[0024] according to Figure 2 , Figure 4 and Figure 5 As shown, a tank cover 302 is provided on the top of the water tank 301. The input end of the first connecting pipe 306 moves through the top of the tank cover 302. The water pump body 305 is installed on the top of the tank cover 302. An installation hole 303 is provided on the top of the tank cover 302. A dustproof net 304 is installed at the opening of the installation hole 303. Under the action of the dustproof net 304, dust in the environment can be prevented from passing through the inside of the installation hole 303 and entering the inside of the water tank 301.

[0025] according to Figures 1-6 As shown, the waste heat boiler mechanism 2 includes a housing 201, a rectangular groove 313 is opened on the top of the inner wall of the housing 201, a rectangular hole 315 is opened on the top of the housing 201, the housing 201 is fixed inside the support frame 1, two dust collection shells 202 are fixed at the bottom of the housing 201, an air inlet pipe 203 is fixedly inserted through one side of the housing 201 near the bottom, and an air outlet pipe 204 is fixedly inserted through the other side of the housing 201 near the top, so that the steam-water mixture pumped by the circulating water pump 208 can be guided into the interior of the boiler drum 210 under the action of the air outlet pipe 204.

[0026] according to Figure 2 , Figure 3 , Figure 5 and Figure 6 As shown, an economizer 205 is installed inside the housing 201. The input and output ends of the economizer 205 are fixedly inserted through the top of the inner wall of the housing 201. An evaporator 206 is installed inside the housing 201. The input and output ends of the evaporator 206 are fixedly inserted through one side of the housing 201, so that under the action of the evaporator 206, some of the water passing through it can be turned into water vapor.

[0027] according to Figure 2 , Figure 3 , Figure 5 and Figure 6 As shown, a superheater 207 is installed inside the shell 201, and an evaporator 206 is located between the economizer 205 and the superheater 207. The inlet and outlet ends of the superheater 207 are fixedly inserted through the top of the inner wall of the shell 201, so that under the action of the shell 201, the water passing through the economizer 205, the superheater 207 and the evaporator 206 can absorb heat from the flue gas passing through the shell 201.

[0028] according to Figures 2-6 As shown, a connecting block 4 is fixed on one side of the housing 201, and a circulating water pump 208 is installed on the surface of the connecting block 4. A boiler drum 210 is installed on the top of the housing 201. The output end of the circulating water pump 208 is connected to the input end of the evaporator 206, so that the steam-water mixture flowing inside the evaporator 206 can be guided to the inside of the water outlet pipe 209 under the action of the circulating water pump 208.

[0029] according to Figures 2-4 and Figure 6As shown, the output end of the evaporator 206 is connected to one of the input ends of the boiler drum 210, the output end of the economizer 205 is connected to the other input end of the boiler drum 210, and one of the output ends of the boiler drum 210 is connected to the input end of the superheater 207. This allows the saturated steam flowing into the superheater 207 to be converted into hot steam and then flowed out under the action of the superheater 207.

[0030] according to Figures 2-6 As shown, the output end of the circulating water pump 208 is equipped with a water outlet pipe 209, and the input end of the water outlet pipe 209 is connected to another output end of the boiler drum 210. Each dust collection shell 202 has a cover plate 211 installed at the bottom. The controller 318 is electrically connected to the circulating water pump 208, so that the starting and closing operation of the circulating water pump 208 can be controlled under the action of the controller 318.

[0031] The overall mechanism achieves the following effect: When it is necessary to recover waste heat from the high-temperature, high-viscosity, dust-laden flue gas generated by the combustion of fuel oil, natural gas, or coal, the pipe for guiding the high-temperature, high-viscosity, dust-laden flue gas is first connected to the inlet pipe 203 on the waste heat boiler. Simultaneously, the controller 318 is connected to an external power supply. An appropriate amount of water is injected into the water tank 301, and the input end of the economizer 205 is connected to an external water pipe. When everything is ready, the high-temperature, high-viscosity, dust-laden flue gas is directly guided into the inlet pipe 203. The flue gas entering the inlet pipe 203 is then directly guided into the shell 201. When the high-temperature, high-viscosity flue gas enters the shell 201, it directly enters the economizer 205. Water is introduced into the economizer 205, where it slowly absorbs heat from the flue gas. The pre-heated water then enters the boiler drum 210, where it mixes with the saturated water already inside. This mixture then flows through the outlet at the bottom of the boiler drum 210 into the evaporator 206. Inside the evaporator 206, the water absorbs heat from the flue gas passing through the shell 201. Some of this heat-absorbing water then begins to produce steam. The steam-water mixture flowing within the evaporator 206 then exits directly and is activated by the circulating water pump started by the controller 318. The combination of pipe 208 and outlet pipe 209 guides the steam back into the boiler drum 210. Under the action of the boiler drum 210, steam and water are separated. The separated water falls into the boiler drum 210, while the steam flows directly out of the boiler drum 210 and into the superheater 207. The steam entering the superheater 207 then absorbs heat from the high-temperature, high-viscosity, dust-laden flue gas moving inside the shell 201. This heat-absorbing steam becomes superheated steam and is finally discharged from the output end of the superheater 207, transported to equipment connected to the superheater 207 for use. This effectively achieves resource conservation. When the waste heat boiler needs to process a large amount of high-temperature, high-viscosity, heat-laden flue gas for waste heat treatment... During recovery, viscous dust may accumulate at the bend in the ventilation system inside the shell 201. To ensure the normal ventilation of the waste heat boiler and prevent dust blockage that could lead to insufficient ventilation in the shell 201 and affect the efficiency of subsequent flue gas denitrification and desulfurization operations, the controller 318 directly controls the water pump 305. The activated water pump 305, in conjunction with the first connecting pipe 306 and the mounting hole 303, directly draws water from the water tank 301. Then, through the second connecting pipe 307, the water is directly guided into the steam generator 308. When the steam generator 308 is filled with an appropriate amount of water, the controller 318 directly shuts off the water pump 305.The controller 318 directly starts the steam generator 308. The steam generator 308 then rapidly evaporates the incoming water, and the resulting steam is discharged directly from its output end and guided into the third connecting pipe 309. As steam continuously flows into the third connecting pipe 309, the internal pressure increases. When the pressure reaches a certain level, the controller 318 directly opens the solenoid valve 310. When the solenoid valve 310 opens, the high-pressure steam inside the third connecting pipe 309 enters the solenoid valve 310, then flows into the one-way valve 311, subsequently into the multi-port pipe 312, and finally is distributed to each nozzle 320. When steam enters the nozzle 320, the controller 318 simultaneously starts the motor 316. The motor 316 directly drives the rotating rod 314 to rotate, which in turn drives the two connected sealing plates 321 to rotate. When the two sealing plates 321 rotate 90 degrees simultaneously, the controller 318 shuts off the motor 316. When the motor 316 is off, the steam entering the nozzle 320 is sprayed directly out of its nozzle, hitting the bend in the housing 201 used for flue gas passage, cleaning away the sticky dust at the bend. The cleaned-off sticky dust then falls directly into the dust collection housing 202 for collection. After cleaning, the bend in the housing 201 remains unobstructed, ensuring the efficiency of subsequent flue gas denitrification and desulfurization operations.

[0032] Among them, economizer 205, evaporator 206, superheater 207, circulating water pump 208, boiler drum 210, water pump body 305, steam generator 308, solenoid valve 310, check valve 311, motor 316, controller 318 and nozzle 320 are all existing technologies and will not be explained in detail here.

[0033] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for preventing blockage of high-temperature, high-viscosity, dust-laden flue gas from a waste heat boiler, comprising a support frame (1), characterized in that: A waste heat boiler mechanism (2) is provided on the support frame (1), and an anti-blocking mechanism (3) is provided on the waste heat boiler mechanism (2); the anti-blocking mechanism (3) includes a water tank (301), and a water pump body (305), a rectangular groove (313), a rectangular hole (315) and a mounting plate (317) are provided on the top of the water tank (301). A first connecting pipe (306) is installed at the input end of the water pump body (305), and a second connecting pipe (307) is installed at the output end of the water pump body (305). A steam generator (308) is provided on the top of the water pump body (305), and a third connecting pipe (309) is installed at the output end of the steam generator (308). An electromagnetic device is installed at the output end of the third connecting pipe (309). A valve (310) is provided with a one-way valve (311) installed at the output end of the solenoid valve (310). A multi-port pipe (312) is installed at the output end of the one-way valve (311). A rotating rod (314) is rotatably connected inside the rectangular groove (313). Two symmetrical sealing plates (321) are fixed on the outer surface of the rotating rod (314). A motor (316) is installed on the inner wall of the rectangular hole (315). The output end of the motor (316) is installed with one end of the rotating rod (314). A controller (318) is installed on the surface of the mounting plate (317). Multiple cylindrical holes (319) are equidistantly distributed on the top of the inner wall of the rectangular groove (313). A nozzle (320) is installed inside each cylindrical hole (319). The input end of the first connecting pipe (306) is close to the bottom of the water tank (301), the output end of the second connecting pipe (307) is connected to the input end of the steam generator (308), the surfaces of the two sealing plates (321) are in contact with the inner wall of the rectangular groove (313), the bottom of the water tank (301) is on the same horizontal plane as the bottom of the support frame (1), and the input end of each nozzle (320) is connected to each output end of the multi-port pipe (312); The mounting plate (317) is fixed on the support frame (1), the controller (318) is electrically connected to the water pump body (305), the controller (318) is electrically connected to the steam generator (308), the controller (318) is electrically connected to the solenoid valve (310), and the controller (318) is electrically connected to the motor (316). The top of the water tank (301) is provided with a tank cover (302), the input end of the first connecting pipe (306) is movably inserted through the top of the tank cover (302), the water pump body (305) is installed on the top of the tank cover (302), the top of the tank cover (302) is provided with an installation hole (303), and a dustproof net (304) is installed at the opening of the installation hole (303).

2. The anti-clogging device for high-temperature, high-viscosity, dust-laden flue gas in a waste heat boiler according to claim 1, characterized in that: The waste heat boiler mechanism (2) includes a shell (201), a rectangular groove (313) is opened on the top of the inner wall of the shell (201), a rectangular hole (315) is opened on the top of the shell (201), the shell (201) is fixed inside the support frame (1), two dust collection shells (202) are fixed at the bottom of the shell (201), an air inlet pipe (203) is fixedly inserted on one side of the shell (201) near the bottom, and an air outlet pipe (204) is fixedly inserted on the other side of the shell (201) near the top.

3. The anti-clogging device for high-temperature, high-viscosity, dust-laden flue gas in a waste heat boiler according to claim 2, characterized in that: An economizer (205) is provided inside the housing (201). The input and output ends of the economizer (205) are fixedly inserted through the top of the inner wall of the housing (201). An evaporator (206) is provided inside the housing (201). The input and output ends of the evaporator (206) are fixedly inserted through one side of the housing (201).

4. The anti-clogging device for high-temperature, high-viscosity, dust-laden flue gas in a waste heat boiler according to claim 3, characterized in that: The shell (201) is equipped with a superheater (207) inside. The evaporator (206) is located between the economizer (205) and the superheater (207). The input and output ends of the superheater (207) are fixedly inserted through the top of the inner wall of the shell (201).

5. The anti-clogging device for high-temperature, high-viscosity, dust-laden flue gas in a waste heat boiler according to claim 4, characterized in that: A connecting block (4) is fixed on one side of the housing (201), a circulating water pump (208) is installed on the surface of the connecting block (4), a pot drum (210) is installed on the top of the housing (201), and the output end of the circulating water pump (208) is connected to the input end of the evaporator (206).

6. The anti-clogging device for high-temperature, high-viscosity, dust-laden flue gas in a waste heat boiler according to claim 5, characterized in that: The output end of the evaporator (206) is connected to one of the input ends of the boiler drum (210), the output end of the economizer (205) is connected to the other input end of the boiler drum (210), and one of the output ends of the boiler drum (210) is connected to the input end of the superheater (207).

7. The anti-clogging device for high-temperature, high-viscosity, dust-laden flue gas in a waste heat boiler according to claim 5, characterized in that: The output end of the circulating water pump (208) is equipped with a water outlet pipe (209), the input end of the water outlet pipe (209) is connected to the other output end of the boiler drum (210), and a cover plate (211) is installed at the bottom of each dust collection shell (202). The controller (318) is electrically connected to the circulating water pump (208).

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