CN111298584B - Double-venturi pneumatic wet dust removal system - Google Patents

Double-venturi pneumatic wet dust removal system Download PDF

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Publication number
CN111298584B
CN111298584B CN202010284536.6A CN202010284536A CN111298584B CN 111298584 B CN111298584 B CN 111298584B CN 202010284536 A CN202010284536 A CN 202010284536A CN 111298584 B CN111298584 B CN 111298584B
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dust
pipe
fan
mixing chamber
venturi
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CN111298584A (en
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张正均
苏朋
刘辉
牛卫军
张进
陈闻
吴江元
张珂源
苏风青
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Shandong Juhengyuan Environmental Protection Technology Co ltd
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Shandong Juhengyuan Environmental Protection Technology Co ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D50/00Combinations of methods or devices for separating particles from gases or vapours
    • B01D50/10Combinations of devices covered by groups B01D45/00, B01D46/00 and B01D47/00
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D47/00Separating dispersed particles from gases, air or vapours by liquid as separating agent
    • B01D47/10Venturi scrubbers

Abstract

A double-venturi type pneumatic wet dust removal system comprises a dust collector, a dust controller, a dust conveying pipe, a venturi pneumatic fan, a venturi inertial dust removal chamber, a three-state separator and an atomized dust mixing chamber. The dust collector be connected with the drilling rod exit of dust sediment controller, the bottom of dust sediment controller is provided with toper atomizer, the top of dust sediment controller be connected with dust pipeline through reducing elbow, dust pipeline is connected with the pneumatic fan of venturi, the venturi fan be connected with the atomizing dust mixing chamber, the atomizing dust mixing chamber is connected with venturi inertia clean room. The double-venturi pneumatic wet dust removal system is reasonable in design and convenient to use, and not only can improve the mixing efficiency of dust and water mist and reduce water and air consumption, but also can improve dust suction amount and dust removal efficiency, and especially improves the dust removal efficiency of respiratory dust more effectively.

Description

Double-venturi pneumatic wet dust removal system
Technical Field
The invention relates to underground coal mine ventilation and dust removal equipment, in particular to a double-venturi pneumatic wet dust removal system.
Background
Coal mine gas extraction is a main means for solving the problem of large gas emission of a mine and eliminating coal bed outburst danger. Along with the increase of the mining depth of a mine, the ground stress borne by a coal seam is increased, hole collapse is more and more obvious in the process of drilling by adopting a slag discharging process, the phenomenon of spraying holes is more and more, accidents are easily caused, accumulated water in the holes is not easy to discharge, the problem of water blockage is extremely prominent, and the gas extraction effect is seriously influenced. More and more mines are drilled by selecting a dry drilling process, so that the conditions of hole collapse and orifice spraying are reduced, and cleaning liquid is prevented from flowing into the drilled holes during drilling construction. The dry drilling generally adopts compressed air to remove slag, a large amount of coal slag and coal dust are blown out of a hole along with compressed air in the construction process, so that the dust concentration of a drilling site is seriously exceeded, the body health of construction personnel is influenced, and the danger of dust explosion is brought; meanwhile, the dust-containing gas sprayed from the drill hole is accompanied by high-concentration gas, so that the risk of explosion accidents is caused. Coal mine safety regulations prohibit the use of motors for power or fans with rotating impellers that produce frictional sparks to draw dust laden gases.
The mining dust removal device is indispensable in dry drilling places and is suitable for dust removal during dry drilling of various drill holes. At present, dust is generally reduced by means of an orifice spray device, a drilling wet dust collector, or the like, and a foam dust collector based on the foam dust removal principle is partially used. The dust removal mode has the following defects:
1. The orifice dust remover is mainly designed in an integrated manner, namely a dust hood, a negative pressure skeleton air duct, a dust removal fan, a spraying structure, a mixing chamber, a dust removal dehydration structure and the like are adopted. The dust is conveyed to a dust removal device through a pipeline under negative pressure, which is a common method at present, but because the space of a coal mine underground drilling field is narrow and the equipment is numerous, a dust removal fan can be placed at a place far away from a drilling hole due to the volume problem, the method increases the length of a skeleton air duct and the resistance of a dust removal system, the dust absorption amount is reduced under the same condition, and the dust removal effect is reduced; in addition, the pipeline is too long, the wind speed is gradually reduced, and dust is easy to settle in the pipeline, so that the problem of pipe blockage is caused.
2. The orifice dust collector mostly adopts a single venturi structure, air runs at a high speed in a venturi throat pipe, a large negative pressure is formed behind the air, a dust collection effect is generated, and most dust is mixed with spray in the venturi throat pipe. In order to have a sufficiently large underpressure, it must be ensured that the gas velocity in the throat must not fall below 180 m/s and that the throat cannot be too long (too long a resistance increases, the volume of the precipitator increases, which is unacceptable). Because the spray is combined with the dust in a short-distance and rapid state, the condensation probability is low, and the dust is not easy to remove, especially fine dust.
3. Most manufacturers usually solve the two defects by increasing the spraying amount, the water amount is increased, the dehydration process is incomplete, the sewage discharge amount of a drilling site is increased accordingly, and potential safety hazards exist.
4. The wind speed is changed as required in the whole dust removing process, the wind speed is as fast as possible in the dust removing process to prevent dust from settling, but the wind speed cannot be too fast, and the resistance of a system can be increased due to the too fast wind speed. The air speed at the throat of the venturi fan needs to be as fast as possible, and the air speed can generally reach subsonic speed so as to generate enough negative pressure and absorb more dust. The running speed of the dust-containing gas in the atomized dust mixing chamber is not too fast so as to ensure that the dust is fully combined with the water mist, and the key of wet dust removal is that the dust is combined with the water mist for condensation. Centrifugal dehydration is adopted in the dehydration process, and in order to ensure the dehydration efficiency, the wind speed should be more than 80 m/s. The degree of resolution of this physical conflict determines the overall efficiency of the precipitator, which is not addressed by the prior art precipitators.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a double-venturi pneumatic wet dust removal system which is reasonable in design and convenient to use, can improve the mixing efficiency of dust and water mist, reduce the water quantity and the air consumption, can improve the dust suction quantity and the dust removal efficiency, and is more effective in improving the dust removal efficiency of respiratory dust.
The invention relates to a double-venturi pneumatic wet dust removal system which comprises a dust collector, a dust controller, a dust conveying pipe, a venturi pneumatic fan, an atomized dust mixing chamber, a venturi inertial dust removal chamber and a tri-state separator. The dust collector be connected with the drilling rod exit of dust sediment controller, the bottom of dust sediment controller is provided with toper atomizer, the top of dust sediment controller be connected with the dust conveyer pipe through reducing elbow, dust conveyer pipe connection has the pneumatic fan of venturi, the pneumatic fan of venturi be connected with the atomizing dust mixing chamber, the atomizing dust mixing chamber is connected with venturi inertia clean room.
The venturi pneumatic fan comprises a fan reducing pipe, a fan throat pipe and a fan gradually-expanding pipe, wherein the wide opening end of the fan reducing pipe is connected with the dust conveying pipe, the conical opening end of the fan reducing pipe is connected with the fan throat pipe, a high-pressure gas annular cavity and a circular seam injection nozzle are arranged in the fan throat pipe, the fan throat pipe is connected with the fan gradually-expanding pipe, the conical opening end of the fan gradually-expanding pipe is connected with the fan throat pipe, and the wide opening end of the fan gradually-expanding pipe is connected with the atomized dust mixing chamber.
The venturi inertial dust-removing chamber comprises a dust-removing reducing pipe, a throat accelerating mixing chamber and a dust-removing gradually-expanding pipe, wherein the wide-mouth end of the dust-removing reducing pipe is connected with the atomized dust mixing chamber, the conical-mouth end of the dust-removing reducing pipe is connected with the throat accelerating mixing chamber, the throat accelerating mixing chamber is connected with the dust-removing gradually-expanding pipe, the conical-mouth end of the dust-removing gradually-expanding pipe is connected with the throat accelerating mixing chamber, and the wide-mouth end of the dust-removing gradually-expanding pipe is connected with a tri-state separator.
Furthermore, the dust controller comprises an upper box body, a middle box body and a lower box body which are sequentially connected, the upper box body is connected with the middle box body through a connecting hinge, and an upper spray hole preventing baffle, an upper dust sealing sleeve, a lower spray hole preventing baffle, a lower dust sealing sleeve and a dust filter screen are arranged inside the upper box body and the middle box body.
Furthermore, the lower box body is internally provided with a water curtain dust control nozzle, and the bottom end of the lower box body is provided with a slag falling port.
Furthermore, the dust collector comprises a dust sealing conical pipe and a dust collecting cylindrical copper pipe, the outer diameter of the dust collecting cylindrical copper pipe is matched with the inner diameter of the drilled hole, the wide opening end of the dust sealing conical pipe is slightly larger than the drilled hole and can be partially inserted into the drilled hole, so that the inner wall of the drilled hole is tightly attached to the outer wall of the dust sealing conical pipe.
Further, the inside of atomizing dust mixing chamber be provided with spray nozzle, annular atomizer and the vertical longitude and latitude chord of placing move the filter.
Furthermore, the tri-state separator consists of a centrifugal fan blade and a rotational flow dehydration barrel, the rotational flow dehydration barrel consists of a separation cover and a sewage discharge outlet, and the separation cover consists of a conical rotational flow cover and a cylindrical separation cover.
The double-venturi pneumatic wet dust removal system is reasonable in design and convenient to use, and not only can improve the mixing efficiency of dust and water mist and reduce water and air consumption, but also can improve dust suction amount and dust removal efficiency, and especially is more effective in improving the dust removal efficiency of respiratory dust.
Drawings
FIG. 1 is a schematic structural diagram of a dual-venturi pneumatic wet dedusting system.
FIG. 2 is a schematic structural diagram of a Venturi pneumatic fan of the double-Venturi pneumatic wet dust removal system.
FIG. 3 is a schematic structural diagram of a draught fan throat of the dual-venturi pneumatic wet dust removal system.
FIG. 4 is a schematic structural diagram of a Venturi inertial dust removal chamber of the double-Venturi pneumatic wet dust removal system.
FIG. 5 is a schematic structural diagram of a dust controller of the dual venturi pneumatic wet dedusting system.
FIG. 6 is a schematic structural diagram of a tri-state separator of a dual venturi pneumatic wet dedusting system according to the present invention.
FIG. 7 is a schematic structural diagram of a dust collector of the dual venturi pneumatic wet dedusting system.
FIG. 8 is a schematic structural diagram of a longitude and latitude chord movable filter plate of the double-venturi pneumatic wet dust removal system.
FIG. 9 is a partial structure diagram of a longitude and latitude chord movable filter plate of the double-venturi pneumatic wet dust removal system.
1-dust collector 101-dust sealing conical pipe 102-dust collecting cylindrical copper pipe 2-dust controller 201-upper box 202-middle box 203-lower box 204-upper spray-proof baffle 205-upper dust sealing sleeve 206-lower spray-proof baffle 207-lower dust sealing sleeve 208-slag outlet 209-water curtain dust control nozzle 210-dust filter net 3-reducing elbow 4-dust delivery pipe 5-venturi pneumatic fan 501-fan reducing pipe 502-fan throat 503-high pressure gas annular cavity 504-annular seam injection nozzle 505-fan reducing pipe 6-venturi inertia dust removal chamber 601-dust removal reducing pipe 602-throat accelerating mixing chamber 603-dust removal reducing pipe 7-three-state separator 701-centrifugal fan blade 702-cyclone dewatering water tank 703-conical cyclone cover 704-cylindrical separation cover 705-sewage outlet 706-air outlet 707-air-water isolation cavity 8-atomized dust mixing chamber 801-atomized The nozzle 802-the annular atomizer 803-the longitude and latitude chord moving filter plate 804-the filter grid chord wire 805-the filter grid framework.
Detailed Description
Referring now to the drawings in the specification, in connection with specific embodiments, there is illustrated as follows: the invention relates to a double-venturi pneumatic wet dust removal system which comprises a dust collector 1, a dust controller 2, a dust conveying pipe 4, a venturi pneumatic fan 5, a venturi inertial dust removal chamber 6, a tri-state separator 7 and an atomized dust mixing chamber 8. Dust collector 1 and dust controller 2's drilling rod exit be connected, dust controller 2's bottom is provided with toper atomizer, dust controller 2's top be connected with dust conveyer pipe 4 through reducing elbow 3, dust conveyer pipe 4 is connected with venturi pneumatic fan 5, venturi pneumatic fan 5 be connected with atomizing dust mixing chamber 8, atomizing dust mixing chamber 8 is connected with venturi inertia clean room 6.
The venturi pneumatic fan 5 comprises a fan reducing pipe 501, a fan throat 502 and a fan diverging pipe 505, wherein the wide-mouth end of the fan reducing pipe 501 is connected with 4 channels of the dust conveying pipe, the conical-mouth end of the fan reducing pipe 501 is connected with the fan throat 502, a high-pressure gas annular cavity 503 and a circular-seam injection nozzle 504 are arranged in the fan throat 502, the fan throat 502 is connected with the fan diverging pipe 505, the conical-mouth end of the fan diverging pipe 505 is connected with the fan throat 502, and the wide-mouth end of the fan diverging pipe 505 is connected with the atomized dust mixing chamber 8.
Preferably, the range of the gap of the circumferential injection nozzle 504 is recommended to be 0.04-0.25mm, the inner diameter of the fan throat 502 is phi 50 mm-phi 2100mm, the length of the fan throat 502 is about 0.6-2 times of the inner diameter, the diffusion angle beta of the fan divergent pipe 505 is 6-12 degrees, the outlet cross section area is 2-5 times of the cross section area of the fan throat 502, the contraction angle of the fan divergent pipe 501 is 45-60 degrees, and the inlet cross section area is 1.5-3 times of the cross section area of the fan throat 502.
Preferably, the sectional area of the atomized dust mixing chamber 8 is 2-4 times of the sectional area of the outlet of the fan divergent pipe 505, and the length of the atomized dust mixing chamber 8 is 0.6-2.5 times of the inner diameter thereof.
The venturi inertial dust chamber 6 comprises a dust-removing reducing pipe 601, a throat accelerating mixing chamber 602 and a dust-removing diverging pipe 603, wherein the wide-mouth end of the dust-removing reducing pipe 601 is connected with the atomized dust mixing chamber 8, the cone-mouth end of the dust-removing reducing pipe is connected with the throat accelerating mixing chamber 602, the throat accelerating mixing chamber 602 is connected with the dust-removing diverging pipe 603, the cone-mouth end of the dust-removing diverging pipe 603 is connected with the throat accelerating mixing chamber 602, and the wide-mouth end of the dust-removing diverging pipe is connected with the tri-state separator 7.
Preferably, the inner diameter of the throat accelerating mixing chamber 602 is 1.5 to 3 times of the inner diameter of the fan throat 502, the length of the throat accelerating mixing chamber 602 is about 1.5 to 3 times of the inner diameter, the diffusion angle β of the dust removal gradually-expanding pipe 603 is 10 to 20 °, and the contraction angle of the dust removal gradually-expanding pipe 601 is 45 to 66 °.
Preferably, the cross-sectional area of the outlet of the dedusting divergent pipe 603 of the venturi inertial dedusting chamber 6 is 1.5 to 3 times of the cross-sectional area of the throat accelerating mixing chamber 602. The cross section of the inlet of the dust removal reducing pipe 601 is equal to that of the atomized dust mixing chamber 8, and the shape of the inlet is matched with that of the atomized dust mixing chamber.
The dust collector 1 and the dust controller 2 are matched with each other, and the dust is conveyed to the Venturi pneumatic fan 5 through the reducing elbow 3 and the dust conveying pipe 4. The dust and air are accelerated and transmitted to the fan throat 502 through the fan reducing pipe 501, the dust and air are transferred to the fan expanding pipe 505 after being mixed at high speed through the fan throat 502, the mixture of the dust and the air is accelerated and transmitted to the atomized dust mixing chamber 8 through the fan expanding pipe 505, and the dust and the water mist are mixed and transmitted to the venturi inertial dust removal chamber 6. The mixture of dust and water mist is accelerated by the dust removal reducing pipe 601, then is transmitted to the throat pipe acceleration mixing chamber 602 after being accelerated, is uniformly mixed in the throat pipe acceleration mixing chamber 602, then is transmitted to the dust removal gradually expanding pipe 603, is accelerated by the dust removal gradually expanding pipe 603, and is transmitted to the tri-state separator 7 for dehydration and separation after being accelerated.
The structure of the Venturi pneumatic fan 5 is the same as that of the Venturi tube of the Venturi inertial dust removal chamber 6, but the specification is different, the section of the Venturi throat of the Venturi inertial dust removal chamber 6 is larger, and the wind speed only needs to be controlled at a speed which is not too high. Overall, the larger the wind speed and water speed of the throat 502 of the venturi pneumatic fan 5 is, the better the suction force is. The wind speed of the atomized dust mixing chamber 8 is slow, the speed of the venturi inertial dust removal chamber 6 is fast, sufficient wind speed is provided for cyclone dehydration, and the requirement of kinetic energy is met.
Further, the dust controller 2 comprises an upper box 201, a middle box 202 and a lower box 203 which are connected in sequence, the upper box 201 and the middle box 202 are connected through a connecting hinge, and an upper blowout preventing hole baffle 204, an upper dust sealing sleeve 205, a lower blowout preventing hole baffle 206, a lower dust sealing sleeve 207 and a dust filter screen 210 are arranged in the upper box 201 and the middle box 202.
The upper blowout preventing hole baffle 204 and the lower blowout preventing hole baffle 206 are preferably provided with H62 copper plates, the copper plates are hard in texture and have certain strength, the copper plates are not easy to corrode in a wet environment underground, sparks cannot be generated even if a drill rod is occasionally rubbed with the copper plates, construction safety is guaranteed, a large amount of dust and gas are prevented from being sprayed outwards, and the effect of preventing spraying holes is achieved. The upper dust sealing sleeve 205 and the lower dust sealing sleeve 206 preferably recommend flame-retardant anti-static rubber plates which have strong plasticity and are tightly connected with the drill rod, and the outer end of the drill hole is sealed along the radial direction and the axial direction of the drill rod to prevent dust from escaping. The dust filter 210 prevents the large particle dust from being sucked into the dust remover due to the overlarge air volume injected by the venturi pneumatic fan 5.
Furthermore, the inside of the lower box body 203 is provided with a water curtain dust control nozzle 209 through a water pipe, and the bottom end of the lower box body is provided with a slag falling port 208. The water curtain dust control nozzle 209 spouts the conical water curtain to wet the dust slag and form a conical water curtain wall to prevent secondary dust raising.
Furthermore, the dust and slag collector 1 is fixedly connected with a dust sealing conical tube 101 and a dust collecting cylindrical copper tube 102, the outer diameter of the dust collecting cylindrical copper tube 102 is matched with the inner diameter of a drilled hole, the wide opening end of the dust sealing conical tube 101 is slightly larger than the drilled hole and can be partially inserted into the drilled hole, so that the inner wall of the drilled hole is tightly attached to the outer wall of the dust sealing conical tube 101, and the dust sealing effect is achieved. The cylindrical copper pipe 102 of collection dirt have good electric conductivity, the heat conductivity, it meets static, the spark takes place the possibility of exploding at drilling process to have reduced the gas, and copper pipe texture is hard moreover, difficult corruption in moist environment in the pit, simultaneously because the copper pipe have with drilling internal diameter assorted external diameter, make the copper pipe hug closely the drilling internal warp, prevent that gas, dust from leaking out between copper pipe and the drilling, have better sealed, also can not produce the spark if the drilling rod occasionally rubs with the copper pipe, guarantee construction safety.
Further, the inside of the atomized dust mixing chamber 8 is provided with a spray nozzle 801, an annular sprayer 802 and a vertically arranged longitude and latitude chord movable filter plate 803.
Further, the tri-state separator 7 is composed of a centrifugal fan blade 701 and a cyclone dewatering barrel 702, the cyclone dewatering barrel 702 is composed of a separating cover and a sewage draining outlet, and the separating cover is composed of a conical cyclone cover 703 and a cylindrical separating cover 704.
The high-speed flowing dust-containing gas enters the atomized dust mixing chamber 8, the speed is rapidly reduced, the spray nozzle 801 of the annular sprayer 802 generates spray, a large amount of dust and water mist are wet and condensed to form a large water mist dust group, and fine dust is further wet and condensed to form a large water mist dust group under the intercepting and swinging actions of the filter grid plate string wires 804 when passing through the warp-weft string-moving filter plate 803.
The gas moving at high speed suddenly reduces the speed in the atomized dust mixing chamber 8, and has a speed difference with fog drops generated by spraying, the water mist and the dust are sheared and fused with each other, the time for combining the water mist and the dust is increased due to the reduction of the wind speed, the probability of combining the dust and the water mist is increased, and the dust removal efficiency is improved.
When the gas, dust, water mist and dust mixture enters the throat pipe accelerated mixing chamber 602 through the dust removal reducing pipe 601, the sectional area of the throat pipe accelerated mixing chamber 602 is far smaller than that of the atomized dust mixing chamber 8, the speed is improved, the quality and the speed of the gas, dust, water mist and dust mixture are different, and the dust and the water mist have the opportunity to be further moistened, mixed and condensed. When the mixture passes through the outlet of the dust removal gradually-expanding pipe 603, the speed is already increased to more than 120 m/s, and the requirement of dehydration and dust removal of the tri-state separator 7 is met.
The dust-containing gas is improved to the subsonic speed through the Venturi pneumatic fan 5, and can generate larger negative pressure after passing through the fan reducing pipe 501, so that more dust-containing air is sucked, and the dust collection efficiency is improved. The speed of the dust-containing gas passing through the atomized dust mixing chamber 8 is quickly reduced, time is provided for fully combining dust and water mist, and the key for improving the wet dust removal efficiency is that the dust and the water mist are fully combined. The dust removal efficiency can be greatly improved. The dust mixture and gas are decelerated and accelerated through the atomized dust mixing chamber 8 and the Venturi inertial dust removal chamber 6, the combination probability of dust and water mist is increased, the dust and the water mist are fully combined, the wind speed of the tri-state separator 7 during rotation inertial dehydration can be guaranteed, the requirements of the wind speed of each part can be met by optimizing the structure of each part, the dust-collecting capacity is maximum under the same air consumption and the same air pressure, the dust and the water mist are more fully mixed, the tri-state separator 7 is more ideal in dehydration, the system resistance is smaller at the moment, and the novel efficient energy-saving air-injection wet orifice dust collector is a new generation of air-injection wet orifice dust collector.
The basic principle of the venturi pneumatic fan 5 is the "hole effect", that is, compressed air fed from an external compressed air source enters a high-pressure gas annular cavity 503 through a compressed gas inlet valve, expands in the high-pressure gas annular cavity 503 to increase the flow rate, and then jets into an inner cavity of a fan gradually-expanding pipe 505 at a high speed through an annular seam jet nozzle 504, so that negative pressure is formed in the inner cavity of a fan throat 502, and fine dust in the sediment controller 2 is sucked into the atomized dust mixing chamber 8 and the venturi inertial dust removal chamber 6 through the dust conveying pipe 4 and the reducing elbow 3. The tail gas is discharged through an exhaust port 706 after being separated and dehydrated by the tri-state separator 7, and the dust-containing sewage flows into a designated position through a sewage discharge port 705 of the tri-state separator 7. The purpose of purifying dust on site is achieved, the whole process does not use electricity, and the device has no rotating part, simple structure, convenient operation, safety and reliability.
The working process of the double-Venturi pneumatic wet dust removal system is as follows: compressed gas enters a high-pressure gas annular cavity 503 through a compressed gas inlet valve, then is sprayed out at high speed through an annular gap injection nozzle 504 communicated with the high-pressure gas annular cavity 503, a vacuum environment is formed at a fan throat 502 at the outlet of the annular gap injection nozzle 504, dust-containing gas of the dust controller 2 is injected and mixed with injection gas through a dust conveying pipe 4 and a reducing elbow 3, and then is conveyed to an atomized dust mixing chamber 8 and a Venturi inertial dust removal chamber 6 through a fan gradually-expanding pipe 505. The suction capacity of the Venturi pneumatic fan 5 is very strong, the efficiency is higher, the used ejection gas is ordinary compressed air, the pressure of the ejection gas is larger than 0.12Mpa, the size of a gap of the annular gap ejection nozzle 504 of the Venturi pneumatic fan 5 is adjustable, the pressure range of the ejection gas is wide, the function of sucking different dust-containing gas flow rates is realized by adjusting the size of the gap of the annular gap ejection nozzle 504 of the Venturi pneumatic fan 5, the size of the gap of the annular gap ejection nozzle 504 and the size of the inner channel of the fan throat 502 can be reasonably designed according to the size and resistance of the ejection air quantity, and therefore the ejection efficiency is highest.
Dust controller 2 in the fine dust be inhaled to atomizing dust mixing chamber 8 and venturi inertia clean room 6 under drawing gaseous drive, wherein the large granule sediment is blockked and falls by falling the sediment mouth 208 under the action of gravity at dust filter screen 210, pressure water forms the toper spraying through water curtain pneumatic valve through water curtain accuse dirt nozzle 209, prevents the secondary raise dust.
The dust-containing gas injected enters the atomized dust mixing chamber 8 and the venturi inertial dust removal chamber 6, and then is sprayed with the mist generated by the annular sprayer 802 in the atomized dust mixing chamber 8, and the mist and dust mixture is formed by wetting, condensing and gathering through the intercepting and swinging work of the longitude and latitude chord movable filter plate 803. The mixed gas is further mixed and condensed in the throat accelerating mixing chamber 602. The fully mixed dust water mist mixture enters a tri-state separator 7 at a certain speed, and the mixed gas changes from longitudinal movement into rotary forward movement through a centrifugal fan blade 701. The dust and the water mist are further fused and condensed in the process of changing the running direction. Under the action of centrifugal force, the mixture of dust and water mist is thrown to the inner wall of the cyclone dewatering barrel 702, the water mist and dust mixture is separated from gas by the conical cyclone cover 703 and the cylindrical separating cover 704, the water mist and dust mixture is collected by the gas-water separating cavity 707 and then discharged through the sewage discharge port 705, and the separated gas is discharged through the inner cavity of the cylindrical separating cover 704 through the exhaust port 706. The purpose of on-site purification is achieved, no electricity is used in the whole process, no rotating part is needed, the structure is simple, the operation is convenient, and the device is safe and reliable.
The double-venturi pneumatic wet dust removal system is reasonable in design and convenient to use, and not only can improve the mixing efficiency of dust and water mist and reduce water and air consumption, but also can improve dust suction amount and dust removal efficiency, and especially is more effective in improving the dust removal efficiency of respiratory dust.

Claims (5)

1. The utility model provides a pneumatic wet dedusting system of two venturi formulas, includes dirt sediment collector (1), dirt sediment controller (2), dust conveyer pipe (4), venturi pneumatic fan (5), venturi inertial dust removal room (6), three-state separator (7) and atomizing dust mixing chamber (8), its characterized in that: the dust and slag collector (1) is connected with the outlet of a drill rod of the dust and slag controller (2), the bottom of the dust and slag controller (2) is provided with a conical spraying device, the top of the dust and slag controller (2) is connected with a dust conveying pipe (4) through a reducing elbow (3), the dust conveying pipe (4) is connected with a Venturi pneumatic fan (5), the Venturi pneumatic fan (5) is connected with an atomized dust mixing chamber (8), and the atomized dust mixing chamber (8) is connected with a Venturi inertial dust removal chamber (6);
the Venturi pneumatic fan (5) comprises a fan reducing pipe (501), a fan throat pipe (502) and a fan reducing pipe (505), the wide-mouth end of the fan reducing pipe (501) is connected with the dust conveying pipe (4), the cone-mouth end of the fan reducing pipe is connected with the fan throat pipe (502), a high-pressure gas annular cavity (503) and a circular seam injection nozzle (504) are arranged in the fan throat pipe (502), the fan throat pipe (502) is connected with the fan reducing pipe (505), the cone-mouth end of the fan reducing pipe (505) is connected with the fan throat pipe (502), the wide-mouth end of the fan reducing pipe is connected with the atomized dust mixing chamber (8), and a spraying nozzle (801), an annular sprayer (802) and a vertically-placed longitude-latitude chord-moving filter plate (803) are arranged in the atomized dust mixing chamber (8); the length of the fan throat pipe (502) is 0.6-2 times of the inner diameter, the diffusion angle beta of the fan divergent pipe (505) is 6-12 degrees, the outlet sectional area of the fan divergent pipe is 2-5 times of the sectional area of the fan throat pipe (502), the contraction angle of the fan divergent pipe (501) is 45-60 degrees, the inlet sectional area of the fan divergent pipe is 1.5-3 times of the sectional area of the fan throat pipe (502), the sectional area of the atomized dust mixing chamber (8) is 2-4 times of the outlet sectional area of the fan divergent pipe (505), and the length of the atomized dust mixing chamber (8) is 0.6-2.5 times of the inner diameter of the atomized dust mixing chamber;
The Venturi inertial dust removal chamber (6) comprises a dust removal reducing pipe (601), a throat accelerating mixing chamber (602) and a dust removal gradually expanding pipe (603), wherein the wide-mouth end of the dust removal reducing pipe (601) is connected with the atomized dust mixing chamber (8), the cone-mouth end of the dust removal reducing pipe is connected with the throat accelerating mixing chamber (602), the throat accelerating mixing chamber (602) is connected with the dust removal gradually expanding pipe (603), the cone-mouth end of the dust removal gradually expanding pipe (603) is connected with the throat accelerating mixing chamber (602), and the wide-mouth end of the dust removal gradually expanding pipe is connected with a tri-state separator (7); the inner diameter of the throat accelerating mixing chamber (602) is 1.5-3 times of the inner diameter of the fan throat (502), the length of the throat accelerating mixing chamber (602) is 1.5-3 times of the inner diameter, the diffusion angle beta of the dedusting gradually-expanding pipe (603) is 10-20 degrees, and the contraction angle of the dedusting gradually-expanding pipe (601) is 45-66 degrees;
the sectional area of the outlet of the dedusting divergent pipe (603) of the Venturi inertial dedusting chamber (6) is 1.5-3 times of that of the throat pipe accelerated mixing chamber (602);
the sectional area of the inlet of the dust removal reducing pipe (601) is equal to that of the atomized dust mixing chamber (8), and the shapes of the inlet and the atomized dust mixing chamber are matched.
2. A dual venturi pneumatic wet scrubbing system as set forth in claim 1, wherein: the dust and slag controller (2) comprises an upper box body (201), a middle box body (202) and a lower box body (203) which are sequentially connected, the upper box body (201) is connected with the middle box body (202) through a connecting hinge, and an upper blowout prevention hole baffle plate (204), an upper dust sealing sleeve (205), a lower blowout prevention hole baffle plate (206), a lower dust sealing sleeve (207) and a dust and slag filtering net (210) are arranged inside the dust and slag controller.
3. A dual venturi pneumatic wet scrubbing system as set forth in claim 2, wherein: the interior of the lower box body (203) is provided with a water curtain dust control nozzle (209) through a water pipe, and the bottom end of the lower box body is provided with a slag falling port (208).
4. A dual venturi pneumatic wet scrubbing system as set forth in claim 1, wherein: the dust and slag collector (1) comprises a dust sealing conical pipe (101) and a dust collecting cylindrical copper pipe (102), the outer diameter of the dust collecting cylindrical copper pipe (102) is matched with the inner diameter of a drilled hole, the wide opening end of the dust sealing conical pipe (101) is slightly larger than the drilled hole and can be partially inserted into the drilled hole, so that the inner wall of the drilled hole is tightly attached to the outer wall of the dust sealing conical pipe (101).
5. A dual venturi pneumatic wet scrubbing system as set forth in claim 1, wherein: the tri-state separator (7) is composed of a centrifugal fan blade (701) and a cyclone dewatering barrel (702), the cyclone dewatering barrel (702) is composed of a separation cover and a sewage discharge outlet, and the separation cover is composed of a conical cyclone cover (703) and a cylindrical separation cover (704).
CN202010284536.6A 2020-04-13 2020-04-13 Double-venturi pneumatic wet dust removal system Active CN111298584B (en)

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CN114087698B (en) * 2021-11-24 2023-01-31 泰州市人民医院 Clean silence air supply system for operating room
CN114146522B (en) * 2021-11-30 2023-02-03 华能吉林发电有限公司长春热电厂 Venturi wet dust removal device
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