CN111013300A - Workshop waste gas collecting and treating device - Google Patents
Workshop waste gas collecting and treating device Download PDFInfo
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- CN111013300A CN111013300A CN201911397372.1A CN201911397372A CN111013300A CN 111013300 A CN111013300 A CN 111013300A CN 201911397372 A CN201911397372 A CN 201911397372A CN 111013300 A CN111013300 A CN 111013300A
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- water
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- treatment box
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
- B01D47/12—Washers with plural different washing sections
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/93—Toxic compounds not provided for in groups B01D2257/00 - B01D2257/708
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- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention relates to the technical field of waste gas treatment, and discloses a workshop waste gas collecting and treating device which comprises a platform, wherein a first treating box and a second treating box are fixed on the top of the platform, a guide plate is fixed on the inner top wall of the first treating box, a water pumping pipe is communicated with the lower end of the right side wall of the first treating box, a water pump is fixedly installed on the water pumping pipe and fixed on the side wall of the first treating box, the other end of the water pumping pipe penetrates through the top of the first treating box and the guide plate and is rotatably connected with a rotating pipe, the outer circular surface of the rotating pipe is communicated with a plurality of transverse water spraying pipes, a support plate is fixed on the outer circular surface of the water pumping pipe, the left end of the support plate is fixed on the left side wall of the first treating box, a first motor and a shield are fixedly installed at the bottom of the support plate, the first motor is located inside the shield, and a rotating shaft. The invention solves the problems that the existing workshop waste gas treatment device has poor treatment effect and the gas and dust contained in the waste gas can not be thoroughly treated.
Description
Technical Field
The invention relates to the technical field of waste gas treatment, in particular to a workshop waste gas collecting and treating device.
Background
Most factory workshops generate some waste gas during operation, and some factory workshops have pungent odor and even foul odor, such as spraying workshops and printing workshops. The waste gas components contain a large amount of volatile organic compounds, and some of the waste gas components also contain dust particles or acid and alkali gases, and the gases can cause damage to the bodies of workshop workers, and can cause air pollution, haze and the like when the waste gas components are not purified and discharged into the air, so that the waste gas components are very important and necessary for treating the workshop waste gas.
The existing workshop waste gas treatment device is simple, dust is contained in collected flue gas, the collected flue gas cannot be effectively treated, and the flue gas discharged after treatment contains dust and toxic gas and still causes certain pollution to the environment.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a workshop waste gas collecting and treating device, which solves the problems that the existing workshop waste gas treating device is poor in treating effect and gases and dust contained in waste gas cannot be thoroughly treated.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme: a workshop waste gas collecting and processing device comprises a platform, wherein a first processing box and a second processing box are fixed at the top of the platform, a guide plate is fixed on the inner top wall of the first processing box, a water pumping pipe is communicated with the lower end of the right side wall of the first processing box, a water pump is fixedly mounted on the water pumping pipe and is fixed on the side wall of the first processing box, the other end of the water pumping pipe penetrates through the top of the first processing box and the guide plate and is rotatably connected with a rotating pipe, the outer circular surface of the rotating pipe is communicated with a plurality of transverse water spraying pipes, a support plate is fixed on the outer circular surface of the water pumping pipe, the left end of the support plate is fixed on the left side wall of the first processing box, a first motor and a shield are fixedly mounted at the bottom of the support plate, the first motor is located inside the shield, a rotating shaft is fixedly mounted at the output end of the first motor, a fan is fixed on the bottom end of the rotating shaft and penetrates through the shield, belt, the two belt wheels are in transmission connection through a belt;
the upper end of the inner wall of the second treatment box is provided with a sliding groove, springs are fixed on the inner wall of the sliding groove, a same transverse rod is fixed between the top ends of the two springs, two groups of supports are fixedly arranged at the bottom of the transverse rod, the number of each group of supports is two, a water storage plate is fixed between the bottom ends of the two supports of each group, the top of the second treatment box is communicated with an air outlet pipe, and an active carbon adsorption layer is arranged on the inner wall of the air outlet pipe;
the upper end of the right side wall of the first treatment box is communicated with the middle part of the left side wall of the second treatment box by a guide pipe, the left side wall of the first treatment box is communicated with an exhaust pipe, the exhaust pipe is communicated with external waste gas collecting equipment, a second motor is fixedly arranged at the lower end of the left side wall of the second treatment box, a first gear is fixedly arranged at the output end of the second motor, a rotating rod is rotatably connected with the left side inner wall of the first treatment box, the right end of the rotating rod sequentially penetrates through the right side wall of the first processing box and the left side wall of the second processing box and is fixed with an L-shaped rotating handle, the rotating handle is rotatably sleeved with a lantern ring, the top of the lantern ring is fixed with a pull rope, and the other end of the stay cord is fixed in the middle of the bottom of the cross bar, the outer circular surface of one end of the rotating rod, which is positioned in the first treatment box, is sleeved with a plurality of groups of water stirring plates, the outer circular surface of the rotating rod, which is positioned between the first treatment box and the second treatment box, is sleeved with a second gear, and the second gear is meshed with the first gear.
Preferably, the number of the water spraying pipes is four, and a plurality of water spraying holes are formed in the top and the bottom of the outer circular surface of each water spraying pipe.
Preferably, the top of the water storage plate is provided with a circle of water retaining ring, and the bottom of the water storage plate is provided with a plurality of water leakage ports.
Preferably, the right end excircle face of the rotating rod is fixed on the inner bottom wall of the second treatment box through a fixing frame.
Preferably, the number of the water stirring plates in each group is six, and the water stirring plates are annularly distributed on the rotating rod.
Preferably, the surface of the water stirring plate is provided with a water storage tank.
Preferably, the water leaking port of the water storage plate is in a circular truncated cone shape.
Preferably, the suction pipe is located behind the guide pipe and the rotating rod.
Preferably, the lower end of the rotating pipe is fixed at the lower end of the inner wall of the right side of the first treatment box through a connecting frame.
(III) advantageous effects
Compared with the prior art, the invention provides a workshop waste gas collecting and treating device, which has the following beneficial effects:
1. the exhaust gas treatment device comprises a first motor, a first exhaust pipe, a first water spray pipe, a fan, a first exhaust pipe, a first water spray pipe, a first exhaust pipe, a first water spray pipe, a second exhaust pipe, a second.
2. According to the invention, through the arranged rotating pipe, water is uniformly sprayed out from the water spray pipe under the action of the water pump and the water suction pipe, and the rotating pipe is driven to rotate by the first motor, so that water mist sprayed out from the rotating pipe is annular, waste gas and dust are more uniformly soaked in a larger range, and the purification effect is improved.
3. The water stirring plate is driven by the rotating rod to rotate, the water is brought up through the arranged water storage tank, and the water is extruded and stirred on the water surface by matching with the water stirring plate, so that the water is stirred up to contact waste gas and dust, and the dust is further soaked.
4. The rotary handle is arranged, the rotary rod is driven to rotate, the rotary sleeve ring is matched, so that the pull rope pulls the cross rod to move downwards, the cross rod is driven to return by the spring, the support moves up and down, the water storage plate pumps up water in the second treatment tank, and the water leaks from the plurality of water leakage openings and is poured into a guide pipe from the first treatment tank to the waste gas in the second treatment tank through gravity, so that the waste gas is purified, the purification effect is improved, and the dust is treated more thoroughly and effectively.
5. The activated carbon adsorption layer is arranged, so that toxic gas in the waste gas can be further adsorbed and treated, and the gas discharged from the gas outlet pipe is ensured to be clean and environment-friendly.
Drawings
FIG. 1 is a cross-sectional view of a plant exhaust gas collection and treatment apparatus according to the present invention;
FIG. 2 is a front view of the reservoir of the present invention;
FIG. 3 is a side sectional view of the water-stirring plate of the present invention;
FIG. 4 is an enlarged schematic view of the structure A shown in FIG. 1 according to the present invention.
In the figure: 1 platform, 2 first treatment tanks, 3 second treatment tanks, 4 guide plates, 5 water pumping pipes, 6 water pumps, 7 rotating pipes, 8 water spraying pipes, 9 support plates, 10 first motors, 11 shields, 12 rotating shafts, 13 fans, 14 belt wheels, 15 springs, 16 cross rods, 17 supports, 18 water storage plates, 19 air outlet pipes, 20 activated carbon adsorption layers, 21 guide pipes, 22 air pumping pipes, 23 second motors, 24 first gears, 25 rotating rods, 26 rotating handles, 27 lantern rings, 28 pull ropes, 29 water stirring plates and 30 second gears.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 4, the present invention provides a technical solution: a workshop waste gas collecting and processing device comprises a platform 1, a first processing box 2 and a second processing box 3 are fixed at the top of the platform 1, a guide plate 4 is fixed on the inner top wall of the first processing box 2, a water pumping pipe 5 is communicated with the lower end of the right side wall of the first processing box 3, the water pumping pipe 5 is positioned behind a guide pipe 21 and a rotating rod 25, a water pump 6 is fixedly installed on the water pumping pipe 5, the water pump 6 is fixed on the side wall of the first processing box 2, the other end of the water pumping pipe 5 penetrates through the top of the first processing box 2 and the guide plate 4 and is rotatably connected with a rotating pipe 7, the lower end of the rotating pipe 7 is fixed at the lower end of the inner wall of the right side of the first processing box 2 through a connecting frame, the stability of the rotating pipe 7 during rotation is improved, a plurality of transverse water spraying pipes 8 are communicated with the outer circular surface of the rotating pipe 7, the number of the four water spraying pipes 8 is four, and a plurality of water spraying holes are, a support plate 9 is fixed on the outer circular surface of the water pumping pipe 5, the left end of the support plate 9 is fixed on the left side wall of the first treatment box 2, a first motor 10 and a shield 11 are fixedly installed at the bottom of the support plate 9, the first motor 10 can be protected by arranging the shield 11, a waterproof effect is achieved, the first motor 10 is located inside the shield 11, a rotating shaft 12 is fixedly installed at the output end of the first motor 10, a fan 13 is fixed on the bottom end of the rotating shaft 12 and penetrates through the shield 11, belt wheels 14 are sleeved on the outer circular surface of the rotating shaft 12 and the outer circular surface of the rotating pipe 7, and the two belt wheels 14 are connected through belt transmission;
the upper end of the inner wall of the second treatment tank 3 is provided with a sliding groove, the inner wall of the sliding groove is fixed with springs 15, a same cross rod 16 is fixed between the top ends of the two springs 15, the bottom of the cross rod 16 is fixedly provided with two groups of supports 17, the number of each group of supports 17 is two, a water storage plate 18 is fixed between the bottom ends of the two supports 17 of each group, a water leakage port of the water storage plate 18 is in a circular truncated cone shape, when the water storage plate 18 moves downwards to contact with the water surface, the pressure extruded with the water surface is reduced, the water storage plate 18 is convenient to immerse in water for water storage, the top of the water storage plate 18 is provided with a circle of water retaining ring, the bottom of the water storage plate 18 is provided with a plurality of water leakage ports, the top of;
the upper end of the right side wall of the first processing box 2 is communicated with the middle part of the left side wall of the second processing box 3 through a guide pipe 21, the left side wall of the first processing box 2 is communicated with an exhaust pipe 22, the exhaust pipe 22 is communicated with an external waste gas collecting device, the lower end of the left side wall of the second processing box 3 is fixedly provided with a second motor 23, the output end of the second motor 23 is fixedly provided with a first gear 24, the left side wall of the first processing box 2 is rotatably connected with a rotating rod 25, the outer circular surface of the right end of the rotating rod 25 is fixed on the inner bottom wall of the second processing box 3 through a fixing frame, the stability of the rotating rod 25 during rotation is improved, the right end of the rotating rod 25 sequentially penetrates through the right side wall of the first processing box 2 and the left side wall of the second processing box 3 and is fixed with an L-shaped rotating handle 26, a sleeve ring 27 is rotatably sleeved on the rotating handle 26, the top of the sleeve ring 27 is fixed with a pull rope 28, the other end of the pull rope 28 is fixed at the, the number of each group of water stirring plates 29 is six, the water stirring plates are annularly distributed on the rotating rod 25, the surface of each water stirring plate 29 is provided with a water storage tank, in order to stir the water in the water stirring plates 29 better, the outer circular surface of each rotating rod 25, which is positioned between the first treatment tank 2 and the second treatment tank 3, is sleeved with the second gear 30, and the second gear 30 is meshed with the first gear 24.
The working principle is as follows: when the device works, the lower motor 10, the second motor 23 and the water pump 6 are started, when waste gas enters the first treatment box 2 from the exhaust pipe 22, the water pump 6 pumps water in the first treatment box 2 into the rotating pipe 7 through the water pumping pipe 5 and is sprayed out through the water spraying holes of the water spraying pipes 8, the first motor 10 drives the rotating shaft 12 to rotate, the rotating pipe 7 rotates under the driving of the belt pulley 14 and the belt, at the moment, the water mist sprayed out of the water spraying pipes 8 is in annular floating, the fan 13 blows downwards to blow the water mist to the waste gas and blow the waste gas to the water surface at the same time to purify and reduce dust, the second motor 23 drives the rotating rod 25 to rotate through the cooperation of the first gear 24 and the second gear 30, so that the water stirring plates 29 rotate, the stirring water is excited, the waste gas is further soaked by the water mist sprayed out by the fan 13 and the water spraying pipes 8, some of the waste gas enters the second treatment box 3 through the guide pipe 21, the rotating rod 25 rotates to drive the L-shaped rotating handle 26 to, under the cooperation of lantern ring 27, drive stay cord 28 and stimulate horizontal pole 16 and move down, extrusion spring 15 compresses, take back horizontal pole 16 through spring 15 again afterwards, realized that water storage plate 18 reciprocates, when water storage plate 18 moves down to under water, through the separation of manger plate circle to water, carry out short duration retaining, when water storage plate 18 rose, the water of storage above water storage plate 18 leaked down through the mouth of a river of leaking and drenches once more to the leading-in waste gas of pipe 21 and drench, discharge after gaseous purification filtration once more through activated carbon adsorption layer 20 afterwards.
The electrical components presented in the document are all electrically connected with an external master controller and 220V mains, and the master controller can be a conventional known device controlled by a computer or the like.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. The utility model provides a workshop waste gas collection processing apparatus, includes platform (1), its characterized in that: the top of the platform (1) is fixed with a first processing box (2) and a second processing box (3), the inner top wall of the first processing box (2) is fixed with a guide plate (4), the lower end of the right side wall of the first processing box (3) is communicated with a water pumping pipe (5), the water pumping pipe (5) is fixedly provided with a water pump (6), the water pump (6) is fixed on the side wall of the first processing box (2), the other end of the water pumping pipe (5) penetrates through the top of the first processing box (2) and the guide plate (4) and is rotatably connected with a rotating pipe (7), the outer circular surface of the rotating pipe (7) is communicated with a plurality of transverse water spraying pipes (8), the outer circular surface of the water pumping pipe (5) is fixed with a support plate (9), the left end of the support plate (9) is fixed on the left side wall of the first processing box (2), the bottom of the support plate (9) is fixedly provided with a first motor (10) and a shield (11), and the first motor (10) is positioned inside the shield (11), the output end of the first motor (10) is fixedly provided with a rotating shaft (12), the bottom end of the rotating shaft (12) penetrates through the shield (11) and is fixed with a fan (13), the outer circular surface of the rotating shaft (12) and the outer circular surface of the rotating pipe (7) are both sleeved with belt wheels (14), and the two belt wheels (14) are in transmission connection through a belt;
the upper end of the inner wall of the second treatment box (3) is provided with a sliding groove, springs (15) are fixed on the inner wall of the sliding groove, the same transverse rod (16) is fixed between the top ends of the two springs (15), two groups of supports (17) are fixedly installed at the bottom of the transverse rod (16), two supports (17) in each group are fixed, a water storage plate (18) is fixed between the bottom ends of the two supports (17) in each group, the top of the second treatment box (3) is communicated with an air outlet pipe (19), and an activated carbon adsorption layer (20) is arranged on the inner wall of the air outlet pipe (19);
the upper end of the right side wall of the first treatment box (2) is communicated with the middle of the left side wall of the second treatment box (3) through a guide pipe (21), the left side wall of the first treatment box (2) is communicated with an exhaust pipe (22), the exhaust pipe (22) is communicated with external waste gas collecting equipment, the lower end of the left side wall of the second treatment box (3) is fixedly provided with a second motor (23), the output end of the second motor (23) is fixedly provided with a first gear (24), the left side inner wall of the first treatment box (2) is rotatably connected with a rotating rod (25), the right end of the rotating rod (25) sequentially penetrates through the right side wall of the first treatment box (2) and the left side wall of the second treatment box (3) and is fixedly provided with an L-shaped rotating handle (26), a sleeve ring (27) is rotatably sleeved on the rotating handle (26), the top of the sleeve ring (27) is fixedly provided with a pull rope (28), and the other end of the pull rope (, the outer circle surface of one end of the rotating rod (25) positioned in the first treatment box (2) is sleeved with a plurality of groups of water stirring plates (29), the outer circle surface of the rotating rod (25) positioned between the first treatment box (2) and the second treatment box (3) is sleeved with a second gear (30), and the second gear (30) is meshed with the first gear (24).
2. The plant waste gas collecting and treating device as claimed in claim 1, wherein: the number of the water spraying pipes (8) is four, and a plurality of water spraying holes are formed in the top and the bottom of the outer circular surface of each water spraying pipe (8).
3. The plant waste gas collecting and treating device as claimed in claim 1, wherein: the top of the water storage plate (18) is provided with a circle of water retaining ring, and the bottom of the water storage plate (18) is provided with a plurality of water leaking ports.
4. The plant waste gas collecting and treating device as claimed in claim 1, wherein: the outer circle surface of the right end of the rotating rod (25) is fixed on the inner bottom wall of the second treatment box (3) through a fixing frame.
5. The plant waste gas collecting and treating device as claimed in claim 1, wherein: the number of the water stirring plates (29) in each group is six, and the water stirring plates are annularly distributed on the rotating rod (25).
6. The plant waste gas collecting and treating device as claimed in claim 1, wherein: the surface of the water stirring plate (29) is provided with a water storage tank.
7. The workshop exhaust gas collection and treatment device according to claim 3, wherein: the water leakage port of the water storage plate (18) is in a circular truncated cone shape.
8. The plant waste gas collecting and treating device as claimed in claim 1, wherein: the water pumping pipe (5) is positioned behind the guide pipe (21) and the rotating rod (25).
9. The plant waste gas collecting and treating device as claimed in claim 1, wherein: the lower end of the rotating pipe (7) is fixed at the lower end of the inner wall of the right side of the first treatment box (2) through a connecting frame.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911397372.1A CN111013300A (en) | 2019-12-30 | 2019-12-30 | Workshop waste gas collecting and treating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911397372.1A CN111013300A (en) | 2019-12-30 | 2019-12-30 | Workshop waste gas collecting and treating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111013300A true CN111013300A (en) | 2020-04-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911397372.1A Pending CN111013300A (en) | 2019-12-30 | 2019-12-30 | Workshop waste gas collecting and treating device |
Country Status (1)
| Country | Link |
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| CN (1) | CN111013300A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111921321A (en) * | 2020-08-10 | 2020-11-13 | 环亮环境科技有限公司 | New forms of energy electric cleaning car filters dust collecting system |
| CN112246072A (en) * | 2020-10-12 | 2021-01-22 | 安徽万山红环保科技有限公司 | Odor treatment system for hazardous waste combustion plant |
| CN113694662A (en) * | 2021-07-26 | 2021-11-26 | 安徽旭晶粉体新材料科技有限公司 | Dust fall and removal equipment for metal powder processing |
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| CN207169316U (en) * | 2017-08-18 | 2018-04-03 | 博瑞特热能设备股份有限公司 | A kind of combustion type boiler dust removal equipment |
| CN207493402U (en) * | 2017-11-21 | 2018-06-15 | 赵滨霞 | A kind of emission-control equipment |
| CN207628177U (en) * | 2017-12-14 | 2018-07-20 | 石军计 | One kind being used for oil refinery's coking plant emission-control equipment |
| CN208302427U (en) * | 2018-04-21 | 2019-01-01 | 黄河 | A kind of chemical industrial waste gas purifying device |
| CN109499282A (en) * | 2018-11-23 | 2019-03-22 | 界首市荣发再生资源有限公司 | A kind of waste plastic regeneration exhaust gas environment friendly purification apparatus |
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| CN2085253U (en) * | 1991-02-12 | 1991-09-25 | 叶启康 | Waste-gas scrubbing device with rotary sprayer |
| US6139806A (en) * | 1996-06-19 | 2000-10-31 | Earth Resources Corporation | Venturi reactor and scrubber with suckback prevention |
| CN2809482Y (en) * | 2005-07-06 | 2006-08-23 | 吴金郎 | Water-beating air purifier |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111921321A (en) * | 2020-08-10 | 2020-11-13 | 环亮环境科技有限公司 | New forms of energy electric cleaning car filters dust collecting system |
| CN112246072A (en) * | 2020-10-12 | 2021-01-22 | 安徽万山红环保科技有限公司 | Odor treatment system for hazardous waste combustion plant |
| CN113694662A (en) * | 2021-07-26 | 2021-11-26 | 安徽旭晶粉体新材料科技有限公司 | Dust fall and removal equipment for metal powder processing |
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Application publication date: 20200417 |
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