CN114288789B

CN114288789B - Pulse-adjustable back-washing wet-type centrifugal dust removal device

Info

Publication number: CN114288789B
Application number: CN202111631076.0A
Authority: CN
Inventors: 高贵军; 杜靖永; 寇子明; 王唯博
Original assignee: Taiyuan University of Technology
Current assignee: Taiyuan University of Technology
Priority date: 2021-12-29
Filing date: 2021-12-29
Publication date: 2023-02-28
Anticipated expiration: 2041-12-29
Also published as: CN114288789A

Abstract

The invention relates to a pulse-adjustable backwashing wet-type centrifugal dust removal device.A spray pump and an explosion-proof motor are fixed on the left side of a base frame, a circulating water tank is fixed on the right side of the base frame, and a dust removal air box is fixed above the circulating water tank; a dust removal nozzle is arranged at the air inlet of the dust removal air box; the centrifugal dust removal diaphragm and the dust removal filter diaphragm are vertically arranged in the dust removal air box, and a pulse cleaning nozzle is arranged at the air outlet of the dust removal air box; the pulse cleaning nozzle and the dust removing nozzle are arranged on the pipeline, and the dust removing spray nozzle pipeline and the pulse cleaning pipeline are connected to the output port of the spray pump through the spray flushing change-over valve; adjustable pulsed liquid accuse rotary valve is installed on the pulse cleaning pipeline, and control pulse cleaning nozzle produces certain pulse frequency's spraying, establishes the filter and the overflow filter that absorb water in the circulating water tank, and this device simple structure, the performance has the dust collection efficiency height more comprehensively, but the cyclic utilization water resource, and pressure reduction and operation maintenance cost are low, can reduce the air current temperature simultaneously.

Description

Pulse-adjustable back-washing wet-type centrifugal dust removal device

Technical Field

The invention relates to the technical field of wet dust removal and dust fall, in particular to a pulse-adjustable backwashing wet centrifugal dust removal device.

Background

In addition, due to the limited ventilation conditions, dust accumulation is likely to occur, so that the underground operation conditions are deteriorated, the dust concentration is increased due to the dust accumulation, and the production efficiency is affected due to the reduced underground visibility; in addition, dust particles such as pulverized coal with small particle size can cause abrasion of mechanical equipment running underground to different degrees, and the service life of the equipment is shortened; and if the fine particles suspended in the air are not treated, the environment can be seriously polluted and the human health is harmed, so that the dust-containing gas needs to be treated from the source for realizing standard exhaust.

At present, the dust removal device has single functionality, wet dust removal consumes more washing liquid (generally water), humidification water cannot be recycled, and water resource waste is caused; the utility model with publication number CN213668468U "a wet dust collecting and removing device" is a dust removing device for treating industrial emission smoke-containing waste gas, can be used for high-temperature smoke dust waste gas emission control, but the device only adopts a plurality of groups of spray pipe groups for dust removal, does not use a filter screen, and has single functionality; the main defect of wet dust removal is that water resources are consumed, the device is lack of improvement on water saving, and a large amount of water resources are still consumed; in addition, the utility model patent with publication number CN213643584U, a high efficiency wet dust collector, adopts upper and lower layers of filter plates and a rotary felt sleeve to adsorb dust particles, and is provided with a sprayer, so that the dust particle capturing rate is high; however, the dust remover has small ventilation volume and large wind resistance, and is not suitable for treating dust-containing waste gas in a mine, the maintenance and the replacement of the rotary felt sleeve are inconvenient, the device cannot realize the convenient cleaning and the maintenance of the filter screen, the filter screen can cause the blockage of meshes in the long-term use process, and if the filter screen cannot be cleaned conveniently in time, the dust removing efficiency and the ventilation volume can be obviously reduced.

Disclosure of Invention

In order to solve the technical problems, the invention provides a pulse-adjustable backwashing wet-type centrifugal dust removal device, which can improve the capture rate of fine particles in dust-containing gas, further improve the dust removal efficiency by adopting twice filtration, simultaneously realize the cyclic utilization of sewage by arranging a circulating water tank, control a pulse cleaning nozzle by using an adjustable pulse type hydraulic control rotary valve, generate adjustable pulse frequency spray, realize the cleaning of a dust removal filter membrane and prolong the operation and maintenance period of dust removal equipment.

In order to achieve the purpose, the invention adopts the following technical scheme:

a pulse adjustable back-flushing wet centrifugal dust-removing device comprises an explosion-proof motor, a spray pump, a dust-removing air box, a circulating water tank, a base frame and a spray flushing change-over valve; the dust removal air box comprises an air box shell, a pulse cleaning nozzle, a dust removal filter membrane, a centrifugal dust removal membrane, a dust removal nozzle pipeline, an adjustable pulse type hydraulic control rotary valve, a valve body liquid outlet pipeline and a pulse cleaning pipeline; the circulating water tank comprises a tank body, a drain valve, an overflow filter and a water absorption filter; the base frame is formed by welding standard component channel steel and serves as a base of the whole device; the output shaft of the explosion-proof motor is connected with the input shaft of the spray pump through a coupler to realize power transmission; the spraying pump and the explosion-proof motor are both fixed on the left side of the base frame; the circulating water tank is horizontally arranged on the right side of the base frame and fixedly connected with the base frame through welding; the dust removal air box is fixedly connected above the circulating water tank through a bolt assembly, and gaps formed by connection are sealed; a sewage draining notch is formed in the bottom of the air box shell of the dust removing air box and used for draining and leading to the circulating water tank; a dedusting filter membrane and a centrifugal dedusting membrane are arranged in the dedusting air box, and the dedusting filter membrane and the centrifugal dedusting membrane are sequentially arranged in parallel at intervals and are fixed in the dedusting air box in a direction perpendicular to the airflow direction; the centrifugal dedusting diaphragm is arranged at one end close to the air inlet; the dust removal filter membrane is arranged at one end of the air outlet and is used for secondary filtering and dust removal; the dust removal nozzle pipelines are symmetrically distributed at the left side and the right side of the air inlet of the dust removal air box and are vertically fixed on the inner wall of the dust removal air box; the dust removal nozzles are arranged on the dust removal nozzle pipeline and are uniformly distributed, so that the spray coverage range is the whole air inlet; the pulse cleaning pipelines are distributed in an upper row and a lower row and are fixed on the inner wall of the dust removing air box behind the dust removing filter membrane; the pulse cleaning nozzles are uniformly distributed and fixed on the pulse cleaning pipeline, so that the spray coverage range is the area of the whole dedusting filter membrane; the pulse cleaning pipeline is connected with a spray flushing change-over valve outside the dust removal air box through an adjustable pulse type hydraulic control rotary valve, the spray flushing change-over valve is connected with an output pipeline port of a spray pump, the adjustable pulse type hydraulic control rotary valve is connected with a valve body liquid outlet pipeline, and a liquid outlet of the valve body liquid outlet pipeline leads to the circulating water tank; the spray flushing conversion valve is a two-position four-way reversing valve, and an output pipeline port of the spray pump, the dust removal nozzle pipeline and the pulse cleaning pipeline are connected, so that the liquid supply reversing function of the pulse cleaning pipeline and the dust removal nozzle pipeline is realized.

A partition plate is vertically arranged in the circulating water tank, and the overflow filter is vertically embedded between the partition plate and the tank top in the circulating water tank to divide the circulating water tank into two parts; the bottom of the water absorption filter close to the left side of the circulating water tank is connected with a tail end port of a water absorption pipeline of a spray pump outside the circulating water tank; the right side of the circulating water tank is provided with a drain valve, the drain valve is connected with a drain outlet on the side wall of the circulating water tank, the drain outlet is positioned at the position of the rear side wall of the circulating water tank close to the bottom of the tank, and sediments in the circulating water tank can be discharged through the drain valve.

The centrifugal dust removal diaphragm is formed by arranging a plurality of corrugated plates in a corrugated structure at intervals in parallel, the corrugated plates are made of reinforced polypropylene materials with corrugated shapes, and the corrugations of the corrugated plates are arranged along the airflow direction and are perpendicular to the horizontal plane.

The adjustable pulse type hydraulic control rotary valve comprises an end cover, a liquid inlet, a liquid outlet, a valve core seat, a variable throttle valve, a valve core, a coupling, a front end cover of the valve seat, a rear end cover of the valve seat, a gear I, a bearing seat, a gear II, a positioning pin, a liquid supply port and a liquid discharge port; the gear I and the gear II are arranged in a bearing seat, the bearing seat is arranged in a valve seat through positioning of a positioning pin, a front end cover and a rear end cover of the valve seat are respectively fixed to two ends of the valve seat through bolts and are positioned through the positioning pin, a liquid supply port and a liquid discharge port are formed in the side wall of the valve seat and are symmetrical, a variable throttle valve is arranged on the liquid supply port and is connected with a pulse cleaning pipeline, and the high-pressure liquid supply flow can be adjusted; the valve core driving device is composed of a valve seat front end cover, a valve seat rear end cover, a gear I, a bearing seat, a gear II, a positioning pin and a liquid supply port and is used for driving the valve core to rotate; the valve core seat is fixed on the front end cover of the valve seat, the side wall of the valve core seat is provided with a liquid inlet and a liquid outlet, the liquid inlet and the liquid outlet are symmetrical, the valve core is arranged in the valve core seat, the end cover is used for sealing the valve core seat, a valve core shaft is arranged in the valve core, the valve core shaft and a shaft of the gear I are connected through a coupler to realize transmission, the side walls of the valve core along the direction of the valve core shaft are symmetrical in pairs, two sides of the valve core are bulges and are matched with the valve core seat, and the other two sides of the valve core are sunken to facilitate liquid inlet.

The working principle of the adjustable pulse type hydraulic control rotary valve is as follows:

the adjustable pulse type hydraulic control rotary valve is a hydraulic control valve with a certain on-off frequency function; when the pulse cleaning pipeline is communicated with high-pressure liquid, one pipeline flows through the valve body through the variable throttle valve, and the gear is driven to rotate; the other branch flows into a liquid inlet of the valve and generates spray through a nozzle. The valve core is driven by the gear shaft to rotate, and when the valve core hole is aligned with the liquid inlet, liquid supply is started to the pulse cleaning nozzle to generate spray; when the valve core continues to rotate, the valve core hole is staggered with the liquid inlet, the liquid supply to the cleaning nozzle is stopped, the high-pressure liquid only flows into the valve body and flows out to the circulating water tank, and the driving gear rotates. Therefore, the operation of the pulse cleaning nozzle can be automatically controlled. The pulse frequency of the adjustable pulse type liquid control rotary valve is adjusted by the variable throttle valve, and spray with different pulse frequencies can be generated.

Compared with the prior art, the invention has the following beneficial effects:

(1) The centrifugal dedusting diaphragm is a diaphragm with a corrugated structure made of reinforced polypropylene materials, when large polymers formed by coagulation of larger particle dust in gas and water mist pass through the centrifugal dedusting diaphragm at a certain speed, the large polymers are impacted on the diaphragm and flow down along the diaphragm wall under the action of centrifugal force, so that primary dedusting and demisting are realized; after passing through the centrifugal dust removal membrane to reach the dust removal filter membrane, the small dust particles which are not captured are subjected to secondary dust removal, so that fine filtration is realized, the problem that the dust removal efficiency is influenced due to low capture rate of water mist on the dust particles can be better solved, and meanwhile, the effect of cooling is achieved;

(2) The pulse type cleaning nozzle is adopted, the spray generated by the nozzle is in the range of the whole dedusting and filtering membrane, the adjustable pulse type hydraulic control rotary valve can control the pulse cleaning nozzle to generate spray with a certain pulse frequency, the dedusting and filtering membrane can be effectively cleaned by utilizing the impact force of the pulse spray, the replacement frequency of the dedusting and filtering membrane is reduced, the operation and maintenance cost is reduced, and the filter screen can be used for a long time and can keep a good filtering effect;

(3) The overflow filter in the circulating water tank can achieve the effect of filtering sewage, the sewage filtered by the overflow filter returns to the inlet of the spray pump, and is filtered by the filter at the water pumping pipeline port of the spray pump and then recycled by the spray pump, so that the waste of water resources is reduced;

(4) And an adjustable pulse type hydraulic control rotary valve is adopted, and the whole process is controlled by hydraulic pressure, so that potential safety hazards are reduced.

Drawings

FIG. 1 is a schematic view of the internal structure of the apparatus of the present invention;

FIG. 2 is a front view of the structure of the apparatus of the present invention;

FIG. 3 is a left side view of the structure of the apparatus of the present invention;

FIG. 4 is a schematic view of the centrifugal dedusting membrane used in the device of the present invention;

FIG. 5 is a diagram of the atomization range of the dedusting spray nozzle of the device of the invention;

FIG. 6 is a schematic view of an adjustable pulse type hydraulic control rotary valve of the present invention;

FIG. 7 is a cross-sectional view of an adjustable pulsed, hydraulically controlled rotary valve in the apparatus of the present invention;

FIG. 8 is a schematic view of the cartridge configuration of the apparatus of the present invention;

in the figure: 1-explosion-proof motor; 2-a spray pump; 3-dust removal bellows; 4-pulse cleaning the nozzle; 5-dust removal filtering diaphragm; 6-centrifugal dedusting diaphragm; 7-a dust removal nozzle; 8-dust removal nozzle pipeline; 9-a circulating water tank; 10-a blowdown valve; 11-a base frame; 12-an overflow filter; 13-adjustable pulse type hydraulic control rotary valve; 1301-end covers; 1302-a liquid inlet; 1303-supply port; 1304-valve core seat; 1305-a variable throttle valve; 1306-valve seat front end cap; 1307-valve seat; 1308-valve seat rear end cap; 1309-drain port; 1310-a liquid outlet; 1311-a valve core; 1312-a coupling; 1313-Gear

(ii) a 1314-a bearing seat; 1315-Gear

(ii) a 1316-locating pins; 14-a water absorption filter; 15-valve body liquid outlet pipeline; 16-spray flush change-over valve; and 17-pulse cleaning the pipeline.

Detailed Description

The invention will be further explained with reference to the drawings and examples.

As shown in fig. 1 to 5, a pulse-adjustable backwashing wet centrifugal dust collector comprises an explosion-proof motor 1, a spray pump 2, a dust-collecting air box 3, a circulating water tank 9, a base frame 11 and a spray flushing change-over valve 16; the dust removal air box 3 comprises an air box shell, a pulse cleaning nozzle 4, a dust removal filtering membrane 5, a centrifugal dust removal membrane 6, a dust removal nozzle 7, a dust removal nozzle pipeline 8, an adjustable pulse type hydraulic control rotary valve 13, a valve body liquid outlet pipeline 15 and a pulse cleaning pipeline 17; the base frame 11 is formed by welding standard component channel steel and serves as a base of the whole device; an output shaft of the explosion-proof motor 1 is connected with an input shaft of the spray pump 2 through a coupler to realize power transmission; the spray pump 2 and the explosion-proof motor 1 are both fixed on the left side of the base frame 11; the circulating water tank 9 is horizontally arranged on the right side of the base frame 11, and the circulating water tank and the base frame are fixedly connected through welding; the dust removal air box 3 is fixedly connected above the circulating water tank 9 through a bolt assembly, and sealing treatment is carried out between connected gaps to prevent sewage from leaking during working; a sewage draining notch is formed in the bottom of the air box shell of the dust removing air box 3 and used for draining and leading to the circulating water tank 9; a dedusting filter diaphragm 5 and a centrifugal dedusting diaphragm 6 are arranged in the dedusting air box 3, the dedusting filter diaphragm 5 and the centrifugal dedusting diaphragm 6 are sequentially arranged in parallel at intervals and are fixed in the dedusting air box 3 in a direction perpendicular to the airflow direction; the centrifugal dust removal diaphragm 6 is arranged at one end close to the air inlet, the centrifugal dust removal diaphragm is formed by arranging a plurality of corrugated plates with corrugated structures at intervals in parallel, the corrugated plates are made of reinforced polypropylene materials with corrugated shapes, the corrugations of the corrugated plates are arranged along the air flow direction and are perpendicular to the horizontal plane, the dust removal filter diaphragm 5 is arranged at one end of the air outlet and is used for secondary filtering and dust removal, and the dust removal nozzle pipelines 8 are symmetrically distributed at the left side and the right side of the air inlet of the dust removal air box 3 and are vertically fixed on the inner wall of the dust removal air box 3; six dust removal nozzles 7 are uniformly and symmetrically distributed on the dust removal nozzle pipeline 8; the pulse cleaning pipeline 17 is distributed in upper and lower rows and is fixed on the inner wall of the dust removing air box 3 behind the dust removing filter membrane 5; the pulse cleaning nozzles 4 are six and are uniformly and symmetrically distributed on a pulse cleaning pipeline 17, the pulse cleaning pipeline 17 is connected with a spray flushing change-over valve 16 outside the dust removal air box 3 through an adjustable pulse type hydraulic control rotary valve 13, the spray flushing change-over valve 16 is connected with an output pipeline port of the spray pump 2, the adjustable pulse type hydraulic control rotary valve 13 is connected with a valve body liquid outlet pipeline 15, and a liquid outlet of the valve body liquid outlet pipeline 15 is communicated with the circulating water tank 9; the spray flushing change-over valve 16 is a two-position four-way change-over valve, and connects the output pipeline port of the spray pump 2, the dust removal nozzle pipeline 8 and the pulse cleaning pipeline 17, so as to realize the liquid supply change-over function of the pulse cleaning pipeline 17 and the dust removal nozzle pipeline 8; the coarse polymer is impacted on the diaphragm and flows down along the diaphragm wall under the action of centrifugal force when passing through the centrifugal dedusting diaphragm, so that primary dedusting and demisting are realized; the smaller dust particles which are not captured reach the dust removal filter membrane, secondary dust removal is carried out, fine filtration is realized, the dust removal efficiency is effectively improved, and meanwhile, the effect of cooling is also achieved; the dust removing nozzles are uniformly distributed on the dust removing nozzle pipeline, so that the spray coverage range is the whole air inlet, and the dust removing range is enlarged; the adjustable pulse type hydraulic control rotary valve can effectively clean the dedusting and filtering membrane by using the impact force of pulse spraying, reduces the replacement times of the dedusting and filtering membrane, reduces the operation and maintenance cost, and can ensure that the filter screen is used for a long time and keeps good filtering effect.

The circulating water tank 9 comprises a tank body, a drain valve 10, an overflow filter 12 and a water absorption filter 14; a partition board is vertically arranged in the circulating water tank 9, and an overflow filter 12 is vertically embedded between the partition board and the top of the circulating water tank 9 to divide the circulating water tank 9 into two parts; the water absorption filter 14 is close to the bottom of the left side of the circulating water tank 9 and is connected with the tail end port of a water absorption pipeline of the spray pump 2 outside the circulating water tank 9; a drain valve 10 is arranged on the right side of the circulating water tank 9, the drain valve 10 is connected with a drain outlet on the side wall of the circulating water tank 9, the drain outlet is positioned at the position of the rear side wall of the circulating water tank 9 close to the bottom of the tank, and sediments in the circulating water tank 9 can be discharged through the drain valve 10; the sewage filtered by the overflow filter returns to the inlet of the spray pump, and is recycled by the spray pump after being filtered by the water absorption filter at the port of the water suction pipeline of the spray pump, so that the waste of water resources is reduced.

As shown in fig. 6-8, the adjustable pulse type hydraulic control rotary valve comprises an end cover 1301, a liquid inlet 1302, a liquid supply port 1303, a valve core seat 1304, a variable throttle valve 1305, a front end cover 1306 of a valve seat, a valve seat 1307, a rear end cover 1308 of the valve seat, a liquid discharge port 1309, a liquid outlet 1310, a valve core 1311, a coupling 1312, a gear wheel

1313. Bearing assemblySeat 1314, gear

1315 and locating pins 1316; the gear I1313 and the gear II 1315 are installed in a bearing seat 1314 and are positioned by a positioning pin 1316, the bearing seat 1314 is arranged in a valve seat 1307, a front end cover 1306 and a rear end cover 1308 of the valve seat are respectively fixed to two ends of the valve seat 1307 by bolts and are positioned by the positioning pin 1316, a liquid supply port 1303 and a liquid discharge port 1309 are arranged on the side wall of the valve seat 1307, the liquid supply port 1303 and the liquid discharge port 1309 are symmetrical, a variable throttle valve 1305 is installed on the liquid supply port 1303, and the variable throttle valve 1305 is connected with a pulse cleaning pipeline 17 and can adjust high-pressure liquid supply flow; the liquid supply port 1303, the front end cover 1306 of the valve seat, the valve seat 1307, the rear end cover 1308 of the valve seat, the liquid discharge port 1309, the gear I1313, the bearing seat 1314, the gear II 1315 and the positioning pin 1316 form a valve core driving device for driving the valve core 1311 to rotate; the valve core seat 1304 is fixed on a valve seat front end cover 1306, a liquid inlet 1302 and a liquid outlet 1310 are arranged on the side wall of the valve core seat 1304, the liquid inlet 1302 and the liquid outlet 1310 are symmetrical, the valve core 1311 is arranged in the valve core seat 1304, the valve core seat 1304 is sealed by the end cover 1301, a valve core shaft is arranged in the valve core 1311, the valve core shaft is connected with a shaft of a gear I1313 through a coupler 1312 to realize transmission, the side walls of the valve core 1311 along the direction of the valve core shaft are symmetrical in pairs, two sides of the valve core 1311 are in protrusions and matched with the valve core seat 1304, and the other two sides of the valve core 1311 are recessed to facilitate liquid inlet; the variable throttle valve is used for adjusting the flow of high-pressure liquid supply to drive the gear pump to generate different rotating speeds, so that spraying with adjustable pulse frequency is realized.

The working principle of the adjustable pulse type hydraulic control rotary valve is as follows: the adjustable pulse type hydraulic control rotary valve is a hydraulic control valve with a certain on-off frequency function; when the pulse cleaning pipeline 17 is communicated with high-pressure liquid, one path of the pulse cleaning pipeline is communicated to the variable throttle valve 1305 and flows through the valve body to drive the two gears to rotate; the other path of the water flows into a liquid inlet 1302 of the adjustable pulse type hydraulic control rotary valve 13, the valve core 1311 is driven to rotate by a shaft of the gear I1313, and when the hole of the valve core 1311 is aligned with the liquid inlet 1302, liquid supply is started to the pulse cleaning nozzle to generate spraying; when the valve core 1311 continues to rotate, the hole of the valve core 1311 is dislocated with the liquid inlet 1302, liquid supply to the pulse cleaning nozzle is stopped, high-pressure liquid only flows into the valve body and flows out of the circulating water tank, the pulse frequency of the adjustable pulse type liquid control rotary valve is adjusted by the variable throttling valve of the liquid outlet, and spray with different pulse frequencies can be generated.

The working principle of the device is as follows:

and (3) a dust removal process: starting the explosion-proof motor 1 to drive the spray pump 2 to start working, and positioning the spray washing conversion valve 16 at a liquid supply position for the dust removal nozzle pipeline 8; dust-containing gas flows into a dust removal air box 3 bin from an air inlet, when the dust-containing gas passes through a water mist net formed by a dust removal spray nozzle 7, dust particles are captured by the water mist, coarse polymers formed by condensation of the water mist pass through a centrifugal dust removal diaphragm 6 at a certain speed, the coarse polymers flow through corrugated plate groups and are impacted on the centrifugal dust removal diaphragm 6 under the action of centrifugal force, and the coarse polymers flow to the bottom of the dust removal air box along the wall, so that the filtering of large dust particles and a large amount of water mist is realized; the dust of the small particles which are not captured passes through the centrifugal dust removal membrane 6 to reach the dust removal filter membrane 5 for secondary dust removal, so that fine filtration is realized; the cleaning and maintenance of the dedusting and filtering membrane 5 are realized by the pulse cleaning nozzle 4 and the adjustable pulse type hydraulic control rotary valve 13, and the filtering effect of the filter screen can be ensured for a long time. The sewage generated by the two-time filtration is drained into the circulating water tank 9 through the sewage draining notch, the dust particles are precipitated by the sewage in the circulating water tank 9 through standing precipitation, and the precipitate can be discharged through the sewage draining valve 10. When the liquid level stored in the circulating water tank 9 reaches the installation height of the overflow filter 12, the overflow filter 12 starts to perform overflow filtration on the sewage, the filtered water is reused by the spray pump 2 after being filtered by the water absorption filter 14, and finally the purposes of high-efficiency dust removal and water resource recycling are achieved.

Reverse adjustable pulse cleaning: when the mesh of the filter screen of the dedusting filter membrane 5 is blocked, the explosion-proof motor 1 is started to drive the spray pump 2 to work, the spray washing change-over valve 16 is positioned at a liquid supply position for the pulse cleaning pipeline 17, and high-pressure liquid in the pulse cleaning pipeline 17 is controlled by the adjustable pulse type liquid control change-over valve 13, so that the pulse cleaning nozzle 4 generates spray with certain pulse frequency to be sprayed onto the dedusting filter membrane 5, and the purpose of cleaning the dedusting filter membrane is achieved; if necessary, the pulse frequency may be adjusted by adjusting the variable throttle 1305 to vary the feed flow rate and the speed of the valve spool 1311, thereby varying the pulse frequency of the spray. Sewage generated by cleaning the filter screen can be drained to the circulating water tank 9 through the sewage draining notch, and then is recycled after being filtered by the overflow filter 12 and the water absorption filter 14, and dust particles in the sewage are kept stand in the circulating water tank 9 to form precipitates which can be discharged through the sewage draining valve 10.

The described embodiment is only one embodiment of the apparatus of the present invention, not all embodiments, but to better explain the principle and practical application of the present invention, and it should be understood by those skilled in the art that modifications to the technical solutions described in the foregoing embodiments or equivalents of some technical features may be made and all included in the scope of the present invention.

Claims

1. A wet centrifugal dust collector with pulse adjustable back wash is characterized by comprising an explosion-proof motor (1), a spray pump (2), a dust collection air box (3), a circulating water tank (9), a base frame (11) and a spray washing conversion valve (16); the dust removal air box (3) comprises an air box shell, a pulse cleaning nozzle (4), a dust removal filtering diaphragm (5), a centrifugal dust removal diaphragm (6), a dust removal nozzle (7), a dust removal nozzle pipeline (8), an adjustable pulse type hydraulic control rotary valve (13), a valve body liquid outlet pipeline (15) and a pulse cleaning pipeline (17); the base frame (11) is formed by welding standard component channel steel and serves as a base of the whole device; the output shaft of the explosion-proof motor (1) is connected with the input shaft of the spray pump (2) through a coupler; the spray pump (2) and the explosion-proof motor (1) are fixed on the left side of the base frame (11); the circulating water tank (9) is horizontally arranged on the right side of the base frame (11), and the circulating water tank and the base frame are fixedly connected through welding; the dust removal air box (3) is fixedly connected above the circulating water tank (9) through a bolt assembly, and gaps between the connected air box and the circulating water tank are sealed; a sewage draining notch is formed in the bottom of the air box shell of the dust removing air box (3) for draining and is communicated with a circulating water tank (9); a dedusting filter diaphragm (5) and a centrifugal dedusting diaphragm (6) are arranged in the dedusting air box (3), the dedusting filter diaphragm (5) and the centrifugal dedusting diaphragm (6) are sequentially arranged in parallel at intervals and are fixed in the dedusting air box (3) perpendicular to the airflow direction, and the centrifugal dedusting diaphragm (6) is arranged at one end close to the air inlet; the dust removal filter membrane (5) is arranged at one end of the air outlet and is used for secondary filtration and dust removal; the dust removal nozzle pipelines (8) are symmetrically distributed at the left side and the right side of an air inlet of the dust removal air box (3) and are vertically fixed on the inner wall of the dust removal air box (3); the dust removal nozzles (7) are uniformly distributed on the dust removal nozzle pipeline (8), so that the whole air inlet is covered by spraying; the pulse cleaning pipelines (17) are distributed in an upper row and a lower row and are fixed on the inner wall of the dust removing air box (3) behind the dust removing filter membrane (5); the pulse cleaning nozzles (4) are uniformly distributed and fixed on the pulse cleaning pipeline (17), so that the spray coverage range is the area of the whole dedusting filter membrane; a pulse cleaning pipeline (17) is connected with a spray flushing change-over valve (16) outside the dust removal air box (3) through an adjustable pulse type hydraulic control rotary valve (13), the spray flushing change-over valve (16) is connected with an output pipeline port of the spray pump (2), a liquid outlet of the adjustable pulse type hydraulic control rotary valve (13) is connected with a valve body liquid outlet pipeline (15), and the valve body liquid outlet pipeline (15) is communicated with the circulating water tank (9); the spray washing conversion valve (16) is a two-position four-way reversing valve, and is used for connecting an output pipeline port of the spray pump (2), the dust removal nozzle pipeline (8) and the pulse cleaning pipeline (17) to realize the liquid supply reversing function of the pulse cleaning pipeline (17) and the dust removal nozzle pipeline (8);

the circulating water tank (9) comprises a tank body, a blowdown valve (10), an overflow filter (12) and a water absorption filter (14); a partition plate is vertically arranged in the circulating water tank (9), and the overflow filter (12) is vertically embedded between the partition plate and the top of the circulating water tank (9) to divide the circulating water tank (9) into two parts; the bottom of the water absorption filter (14) close to the left side of the circulating water tank (9) is connected with the tail end port of a water absorption pipeline of the spray pump (2) outside the circulating water tank; a drain valve (10) is arranged on the right side of the circulating water tank (9), the drain valve (10) is connected with a drain outlet on the side wall of the circulating water tank, and the drain outlet is positioned on the rear side wall of the circulating water tank close to the bottom of the tank;

the adjustable pulse type hydraulic control rotary valve (13) comprises an end cover (1301), a liquid inlet (1302), a liquid supply port (1303), a valve core seat (1304), a variable throttle valve (1305), a valve seat front end cover (1306), a valve seat (1307), a valve seat rear end cover (1308), a liquid discharge port (1309), a liquid outlet (1310), a valve core (1311), a coupling (1312), a gear I (1313), a bearing seat (1314), a gear II (1315) and a positioning pin (1316); the gear I (1313) and the gear II (1315) are mounted in a bearing seat (1314), the bearing seat (1314) is mounted in a valve seat (1307) and is positioned by a positioning pin (1316), a front end cover (1306) and a rear end cover (1308) of the valve seat are respectively fixed to two ends of the valve seat (1307) through bolts and are positioned by the positioning pin, a liquid supply port (1303) and a liquid discharge port (1309) are formed in the side wall of the valve seat (1307), the liquid supply port (1303) and the liquid discharge port (1309) are symmetrical to each other, a variable throttle valve (1305) is mounted on the liquid supply port (1303), and the variable throttle valve (1305) is connected with a pulse cleaning pipeline (17) and can adjust the high-pressure liquid supply flow rate; the liquid supply port (1303), the front end cover (1306) of the valve seat, the valve seat (1307), the rear end cover (1308) of the valve seat, the gear I (1313), the bearing seat (1314), the gear II (1315) and the positioning pin (1316) form a valve core driving device which is used for driving the valve core (1311) to rotate; the valve core seat (1304) is fixed on a valve seat front end cover (1306), a liquid inlet (1302) and a liquid outlet (1310) are formed in the side wall of the valve core seat (1304), the liquid inlet (1302) and the liquid outlet (1310) are symmetrical, the valve core (1311) is arranged in the valve core seat (1304), the valve core seat (1304) is sealed through the end cover (1301), a valve core shaft is arranged in the valve core (1311), the valve core shaft is connected with a shaft of a gear I (1313) through a coupler (1312) to achieve transmission, the valve core (1311) is symmetrical in pairs along the side wall of the valve core shaft direction, protrusions are formed on two sides of the valve core shaft and matched with the valve core seat (1304), and the two sides of the valve core shaft are recessed to facilitate liquid inlet.

2. A pulse-modulated backwash wet centrifugal separator device according to claim 1, characterized in that the centrifugal separator (6) is formed by a corrugated structure of corrugated plates arranged in parallel and spaced apart, the corrugated plates being made of a corrugated reinforced polypropylene material, the corrugations of which are arranged in the direction of the gas flow and perpendicular to the horizontal plane.