CN111013366A - Waste gas purification spray column of environmental protection - Google Patents
Waste gas purification spray column of environmental protection Download PDFInfo
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- CN111013366A CN111013366A CN201911397367.0A CN201911397367A CN111013366A CN 111013366 A CN111013366 A CN 111013366A CN 201911397367 A CN201911397367 A CN 201911397367A CN 111013366 A CN111013366 A CN 111013366A
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- pipe
- tower body
- tower
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- gas purification
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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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
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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 & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention relates to the technical field of spray towers, and discloses an environment-friendly waste gas purification spray tower which comprises a tower body, wherein the top of the tower body is communicated with an exhaust pipe, an activated carbon layer is arranged on the inner wall of the exhaust pipe, the left side wall of the tower body is communicated with an exhaust pipe, an exhaust fan is fixedly installed on the exhaust pipe, a fixing frame and a filling layer are sequentially fixed between the inner side walls of the tower body from top to bottom, a rotating pipe is rotatably connected to the middle of the fixing frame, the top end of the rotating pipe is a sealing end, the bottom end of the rotating pipe penetrates through the filling layer and the bottom of the tower body and is rotatably communicated with a water pumping pipe, the other end of the water pumping pipe penetrates through and extends into the interior of the tower body, a water pump. The invention solves the problems that the existing waste gas spray tower cannot fully fuse and wet the spray liquid and the waste gas, so that the purification effect is poor, and the discharged gas is still polluted.
Description
Technical Field
The invention relates to the technical field of spray towers, in particular to an environment-friendly waste gas purification spray tower.
Background
Industrial waste gas is a generic term for various pollutant-containing gases discharged into the air during the combustion and production processes of fuels in the factory area of an enterprise. These exhaust gases are: carbon dioxide, carbon disulfide, hydrogen sulfide, fluorides, nitrogen oxides, chlorine, hydrogen chloride, carbon monoxide, lead mercury (mist) sulfate, beryllium compounds, smoke dust and productive dust, which are discharged into the atmosphere and pollute the air. The substances enter human bodies through different paths of respiratory tracts, some substances directly cause harm, and some substances have an accumulation effect and can seriously harm the health of people. Different substances may have different effects.
Current spray column sprays through the grid cooperation and purifies when purification treatment, sprays to purify incomplete the partial waste gas that leads to and is not soaked by the spray liquid, and the effect of purification is not good, and the later stage combustion gas still contains some harmful gas, still has certain pollution to the environment.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides an environment-friendly waste gas purification spray tower, which solves the problems that the existing waste gas spray tower cannot be fully fused with waste gas for soaking, the purification effect is poor, and the discharged gas is still polluted.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme: an environment-friendly waste gas purification spray tower comprises a tower body, wherein the top of the tower body is communicated with an exhaust pipe, and the inner wall of the exhaust pipe is provided with an activated carbon layer, the left side wall of the tower body is communicated with an exhaust pipe, an exhaust fan is fixedly arranged on the exhaust pipe, a fixed frame and a filling layer are sequentially fixed between the inner side walls of the tower body from top to bottom, the middle part of the fixed frame is rotatably connected with a rotating pipe, the top end of the rotating pipe is a sealed end, the bottom end of the rotating pipe penetrates through the filling layer and the bottom of the tower body and is rotatably communicated with a water pumping pipe, the other end of the water pumping pipe penetrates through and extends into the tower body, a water pump is fixedly mounted on the water pumping pipe, an L-shaped frame is fixedly mounted on the inner bottom wall of the tower body, the bottom of the transverse end of the L-shaped frame is fixed with the water pump, a motor is fixedly mounted at the top of the transverse end of the L-shaped frame, an output shaft of the motor and one end of the rotating pipe, which is located at the bottom of the tower body, are both fixed with belt wheels, and the two belt wheels are in transmission;
the inner side wall of the tower body is provided with two sliding chutes, the two sliding chutes are connected with sliding blocks in a sliding manner, springs are fixed on the bottoms of the sliding blocks and the inner bottom wall of the sliding chutes, extrusion pushing plates are fixedly arranged on the tops of the sliding blocks, one ends of the two sliding blocks, which are far away from the sliding chutes, are fixed with the same annular spraying pipe, and a hose is communicated between the top of the annular spraying pipe and the outer circular surface of the rotating pipe;
a poke rod is fixed on the outer circular surface of the rotating pipe, the outer circular surface of the rotating pipe is communicated with two guide pipes, a plurality of spray heads are fixedly installed at the top and the bottom of each guide pipe, the guide pipes are positioned below the filling layer and above the air exhaust pipe, a stirring rod is fixed on the outer circular surface of the rotating pipe and positioned in water liquid filled in the tower body;
the lower end of the left side wall of the tower body is communicated with a drain pipe, the middle part of the right side wall of the tower body is fixedly provided with a liquid medicine box, the bottom of the liquid medicine box is communicated with the right side wall of the tower body to form a liquid adding pipe, and valves are arranged on the liquid adding pipe and the drain pipe.
Preferably, a visual observation window is arranged on the side wall of the tower body.
Preferably, the inner bottom wall of the tower body is fixedly provided with a separation net, and the separation net is covered above one end of the tower body on the water pumping pipe.
Preferably, the two extrusion pushing plates are distributed in a rotating pipe pair, and the two extrusion pushing plates are arranged in opposite directions.
Preferably, a plurality of water spray holes are formed in the bottom of the annular spray pipe.
Preferably, the length value of the poke rod is larger than the length value between the two extrusion push plates.
Preferably, a plurality of stirring blades are arranged on the stirring rod, and the stirring blades are inclined.
Preferably, the bottom of the tower body is fixedly provided with a supporting seat.
(III) advantageous effects
Compared with the prior art, the invention provides an environment-friendly waste gas purification spray tower, which has the following beneficial effects:
1. according to the invention, the rotating pipe and the water pumping pipe are rotationally arranged, and the rotating pipe drives the stirring rod, the guide pipe and the poking rod to rotate under the driving of the motor, so that the stirring rod, the guide pipe and the poking rod can work simultaneously, the three parts have synchronism, the purification work can be better carried out, and in addition, one power source is utilized, so that the energy consumption is saved.
2. According to the invention, the liquid medicine added into the liquid medicine box can be fully fused with water through the arranged stirring rod, so that toxic substances in waste gas can be better reacted and purified during spraying, and the purification effect is improved.
3. According to the invention, the sprayed water mist is round through the rotation of the guide pipe and the spray head through the rotating pipe, so that the waste gas is soaked more comprehensively, and the waste gas purification is more thorough and effective.
4. The invention realizes the up-and-down movement of the annular spraying pipe by driving and rotating the poking rod through the rotating pipe, extruding the inclined plane of the pushing plate to enable the sliding block to move downwards and then bringing back the sliding block through the spring, so that the water spray holes at the bottom of the annular spraying pipe scatter the sprayed water mist around along with the moving air flow, the range of the water mist scattering is enlarged, and the effect of soaking waste gas is improved.
5. According to the invention, through the arranged activated carbon layer, part of the waste gas left after purification can be filtered and purified again, the purification work can be carried out more thoroughly, and the safety and environmental protection of the discharged waste gas are ensured.
Drawings
FIG. 1 is a front view of an environmentally friendly flue gas cleaning spray tower of the present invention;
FIG. 2 is a sectional view of an environmentally friendly flue gas cleaning spray tower of the present invention;
FIG. 3 is a top view of the annular tube and slide of the present invention;
FIG. 4 is an enlarged schematic view of a portion A of FIG. 2 according to the present invention;
fig. 5 is a side view of the compression pusher plate of the present invention.
In the figure: the device comprises a tower body 1, an exhaust pipe 2, an activated carbon layer 3, an exhaust pipe 4, an exhaust fan 5, a fixing frame 6, a filling layer 7, a rotating pipe 8, a water pumping pipe 9, a water pump 10, an L-shaped frame 11, a motor 12, a belt wheel 13, a sliding block 14, a spring 15, a pushing plate 16, an annular spraying pipe 17, a hose 18, a poking rod 19, a guide pipe 20, a spray head 21, a stirring rod 22, a drain pipe 23, a liquid medicine box 24, a liquid adding pipe 25 and a separation net 26.
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 5, the present invention provides a technical solution: an environment-friendly waste gas purification spray tower comprises a tower body 1, wherein the top of the tower body 1 is communicated with an exhaust pipe 2, the inner wall of the exhaust pipe 2 is provided with an activated carbon layer 3, the left side wall of the tower body 1 is communicated with an exhaust pipe 4, an exhaust fan 5 is fixedly arranged on the exhaust pipe 4, a fixed frame 6 and a filling layer 7 are sequentially fixed between the inner side walls of the tower body 1 from top to bottom, the filling layer 7 can be a known material of ceramic random packing, the middle part of the fixed frame 6 is rotatably connected with a rotating pipe 8, the top end of the rotating pipe 8 is a sealed end, the bottom end of the rotating pipe 8 penetrates through the filling layer 7 and the bottom of the tower body 1 and is rotatably communicated with a water pumping pipe 9, the other end of the water pumping pipe 9 penetrates through and extends into the tower body 1, a water pump 10 is fixedly arranged on the water pumping pipe 9, an L-shaped frame 11 is fixedly arranged on the inner bottom wall of the tower body 1, the bottom, an output shaft of the motor 12 and one end of the rotating pipe 8, which is positioned at the bottom of the tower body 1, are both fixed with belt wheels 13, and the two belt wheels 13 are in transmission connection through a belt;
the inner side wall of the tower body 1 is provided with two sliding grooves, the two sliding grooves are both connected with sliding blocks 14 in a sliding mode, springs 15 are fixed at the bottoms of the sliding blocks 14 and the inner bottom walls of the sliding grooves, extrusion pushing plates 16 are fixedly installed at the tops of the sliding blocks 14, the two extrusion pushing plates 16 are distributed in a rotating pipe 8 pair mode, the two extrusion pushing plates 16 are arranged in a reverse mode, through the reverse arrangement, the two extrusion pushing plates are simultaneously pushed through two poking rods 19, the stability of the annular spraying pipe 17 during up-and-down shaking is guaranteed, one end, far away from the sliding grooves, of each sliding block 14 is fixed with the same annular spraying pipe 17, a plurality of water spraying holes are formed in the bottom of each annular spraying pipe 17, and a hose 18;
a poke rod 19 is fixed on the outer circular surface of the rotating pipe 8, the length value of the poke rod 19 is larger than the length value between the two extrusion pushing plates 16, the outer circular surface of the rotating pipe 8 is communicated with two guide pipes 20, a plurality of spray heads 21 are fixedly installed at the top and the bottom of each guide pipe 20, each guide pipe 20 is positioned below the filling layer 7 and above the air suction pipe 4, a stirring rod 22 is fixed on the outer circular surface of the rotating pipe 8, each stirring rod 22 is positioned in water liquid filled in the tower body 1, a plurality of stirring blades are arranged on each stirring rod 22, each stirring blade is inclined, the stirring range of each stirring blade is increased, and the stirring effect is improved;
the left side wall lower extreme intercommunication of tower body 1 has drain pipe 23, the right side wall middle part fixed mounting of tower body 1 has liquid medicine case 24, it can add corresponding purification treatment's liquid medicine according to purified gas to set up liquid medicine case 24, more effectual purification work that carries on after mixing with water, and liquid medicine case 24's bottom and tower body 1 right side wall intercommunication have liquid feeding pipe 25, and all be provided with the valve on liquid feeding pipe 25 and the drain pipe 23, the interior diapire fixed mounting of tower body 1 has a separation net 26, and separate net 26 cover and be located the top of tower body 1 one end at drinking-water pipe 9, can filter the granule in some waste gas of suction, avoid blockking up shower nozzle 21, be provided with visual observation window on the tower body 1 lateral wall, make things convenient for the staff to the observation of tower body 1 internal work condition, timely corresponding work of making, the bottom fixed mounting of tower body 1.
The working principle is as follows: when the device works, the exhaust fan 5, the motor 12 and the water pump 10 are started to work, waste gas is sucked into the tower body 1 through the exhaust pipe 4, the motor 12 drives the rotating pipe 8 to rotate through the belt wheel 13 and the belt, so that the stirring rod 22, the conduit 20 and the poking rod 19 rotate, the water pump 10 guides a liquid medicine and water mixture into the rotating pipe 8 through the water suction pipe 9, then the liquid medicine and water mixture is uniformly sprayed out through the plurality of spray heads 21 on the conduit 20, along with the rotation, water mist sprayed out of the spray heads 21 is circular and is uniformly and thoroughly soaked in the guided waste gas, the soaked waste gas is treated through the filling layer 7 and then floats upwards, the poking rod 19 at the moment is driven by the rotating pipe 8 to extrude the two extrusion push plates 16 and extrude the slide blocks 14 downwards along the inclined planes of the extrusion push plates 16, the annular spray pipes 17 vertically shake, water liquid on the rotating pipe 8 enters the annular spray pipes 17 through the hoses 18, along with the up-and-down shaking, the sprayed water mist drifts around, the waste gas is soaked and purified again, and the purified waste gas is discharged through the exhaust pipe 2 after being filtered by the activated carbon layer 3.
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 (8)
1. The utility model provides an exhaust purification spray column of environmental protection, includes tower body (1), its characterized in that: the top of the tower body (1) is communicated with an exhaust pipe (2), an activated carbon layer (3) is arranged on the inner wall of the exhaust pipe (2), the left side wall of the tower body (1) is communicated with an exhaust pipe (4), an exhaust fan (5) is fixedly arranged on the exhaust pipe (4), a fixing frame (6) and a filling layer (7) are sequentially fixed between the inner side walls of the tower body (1) from top to bottom, the middle part of the fixing frame (6) is rotatably connected with a rotating pipe (8), the top end of the rotating pipe (8) is a sealing end, the bottom end of the rotating pipe (8) penetrates through the bottom of the filling layer (7) and the tower body (1) and is rotatably communicated with a water pumping pipe (9), the other end of the water pumping pipe (9) penetrates through and extends to the inside of the tower body (1), a water pump (10) is fixedly arranged on the water pumping pipe (9), an L-shaped frame (11) is fixedly arranged on the inner bottom wall of, a motor (12) is fixedly installed at the top of the transverse end of the L-shaped frame (11), an output shaft of the motor (12) and one end of the rotating pipe (8) positioned at the bottom of the tower body (1) are both fixed with belt wheels (13), and the two belt wheels (13) are in transmission connection through a belt;
two sliding grooves are formed in the inner side wall of the tower body (1), sliding blocks (14) are connected to the two sliding grooves in a sliding mode, springs (15) are fixed to the bottoms of the sliding blocks (14) and the inner bottom walls of the sliding grooves, an extrusion pushing plate (16) is fixedly installed at the tops of the sliding blocks (14), one end, far away from the sliding grooves, of each of the two sliding blocks (14) is fixedly provided with the same annular spraying pipe (17), and a hose (18) is communicated between the top of each annular spraying pipe (17) and the outer circular surface of each rotating pipe (8);
a poke rod (19) is fixed on the outer circular surface of the rotating pipe (8), two guide pipes (20) are communicated with the outer circular surface of the rotating pipe (8), a plurality of spray heads (21) are fixedly installed at the top and the bottom of each guide pipe (20), the guide pipes (20) are positioned below the filling layer (7) and above the air suction pipe (4), a stirring rod (22) is fixed on the outer circular surface of the rotating pipe (8), and the stirring rod (22) is positioned in water liquid filled in the tower body (1);
the lower end of the left side wall of the tower body (1) is communicated with a drain pipe (23), the middle of the right side wall of the tower body (1) is fixedly provided with a liquid medicine box (24), the bottom of the liquid medicine box (24) is communicated with the right side wall of the tower body (1) to form a liquid adding pipe (25), and valves are arranged on the liquid adding pipe (25) and the drain pipe (23).
2. The environmentally friendly exhaust gas purification spray tower of claim 1, wherein: the side wall of the tower body (1) is provided with a visual observation window.
3. The environmentally friendly exhaust gas purification spray tower of claim 1, wherein: the inner bottom wall of the tower body (1) is fixedly provided with a separation net (26), and the separation net (26) covers the upper part of one end of the tower body (1) of the water pumping pipe (9).
4. The environmentally friendly exhaust gas purification spray tower of claim 1, wherein: the two extrusion pushing plates (16) are distributed in a rotating pipe (8) pair mode, and the two extrusion pushing plates (16) are arranged in the opposite direction.
5. The environmentally friendly exhaust gas purification spray tower of claim 1, wherein: the bottom of the annular spraying pipe (17) is provided with a plurality of water spraying holes.
6. The environmentally friendly exhaust gas purification spray tower of claim 1, wherein: the length value of the poke rod (19) is larger than the length value between the two extrusion push plates (16).
7. The environmentally friendly exhaust gas purification spray tower of claim 1, wherein: a plurality of stirring blades are arranged on the stirring rod (22), and the stirring blades are inclined.
8. The environmentally friendly exhaust gas purification spray tower of claim 1, wherein: the bottom of the tower body (1) is fixedly provided with a supporting seat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911397367.0A CN111013366A (en) | 2019-12-30 | 2019-12-30 | Waste gas purification spray column of environmental protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911397367.0A CN111013366A (en) | 2019-12-30 | 2019-12-30 | Waste gas purification spray column of environmental protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111013366A true CN111013366A (en) | 2020-04-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911397367.0A Pending CN111013366A (en) | 2019-12-30 | 2019-12-30 | Waste gas purification spray column of environmental protection |
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| Country | Link |
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| CN (1) | CN111013366A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112843955A (en) * | 2020-12-29 | 2021-05-28 | 林化庆 | Tunnel cave exhaust purification processing system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130305923A1 (en) * | 2011-02-03 | 2013-11-21 | Commonwealth Scientific And Industrial Research Organization | Gas liquid contactor |
| CN204710086U (en) * | 2015-04-29 | 2015-10-21 | 中起重工（大连）有限公司 | A kind of flue gas desulfur device |
| CN207970681U (en) * | 2017-12-20 | 2018-10-16 | 邯郸市宏达防水防腐有限责任公司 | A kind of tail gas spray tower |
| CN108722160A (en) * | 2018-08-09 | 2018-11-02 | 孙菊萍 | A kind of energy-saving and emission-reduction exhaust gas desulfurization column |
| CN208799965U (en) * | 2018-09-22 | 2019-04-30 | 广州市志淼五金机械有限公司 | A kind of biological purification plant for handling containing organic exhaust gas |
| CN209204975U (en) * | 2018-10-19 | 2019-08-06 | 安徽创鼎机械科技有限公司 | A kind of exhaust-gas treatment conveying device for environmental protection equipment |
| CN209501315U (en) * | 2019-01-10 | 2019-10-18 | 河北天昱环保科技有限公司 | Sewage station-service waste gas treatment equipment |
-
2019
- 2019-12-30 CN CN201911397367.0A patent/CN111013366A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130305923A1 (en) * | 2011-02-03 | 2013-11-21 | Commonwealth Scientific And Industrial Research Organization | Gas liquid contactor |
| CN204710086U (en) * | 2015-04-29 | 2015-10-21 | 中起重工（大连）有限公司 | A kind of flue gas desulfur device |
| CN207970681U (en) * | 2017-12-20 | 2018-10-16 | 邯郸市宏达防水防腐有限责任公司 | A kind of tail gas spray tower |
| CN108722160A (en) * | 2018-08-09 | 2018-11-02 | 孙菊萍 | A kind of energy-saving and emission-reduction exhaust gas desulfurization column |
| CN208799965U (en) * | 2018-09-22 | 2019-04-30 | 广州市志淼五金机械有限公司 | A kind of biological purification plant for handling containing organic exhaust gas |
| CN209204975U (en) * | 2018-10-19 | 2019-08-06 | 安徽创鼎机械科技有限公司 | A kind of exhaust-gas treatment conveying device for environmental protection equipment |
| CN209501315U (en) * | 2019-01-10 | 2019-10-18 | 河北天昱环保科技有限公司 | Sewage station-service waste gas treatment equipment |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112843955A (en) * | 2020-12-29 | 2021-05-28 | 林化庆 | Tunnel cave exhaust purification processing system |
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Application publication date: 20200417 |
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