CN212999255U - Waste gas desulfurization treatment device - Google Patents
Waste gas desulfurization treatment device Download PDFInfo
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- CN212999255U CN212999255U CN202021424447.9U CN202021424447U CN212999255U CN 212999255 U CN212999255 U CN 212999255U CN 202021424447 U CN202021424447 U CN 202021424447U CN 212999255 U CN212999255 U CN 212999255U
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Abstract
The utility model discloses a waste gas desulfurization treatment device, which comprises a settling tank and a detection system; the settling tank comprises a closed tank body, a liquid feeding pipe, an air outlet, an air inlet, a discharging drawer, a pump, a blanking port, a liquid return pipe, a partition plate, a liquid collecting tank, a filter tank and a sealing door; the detection system comprises an infrared gas analyzer, a full-automatic chemical analyzer, a second branch pipe, a first branch pipe and a water tank; this device passes through setting tank and detecting system's set control, solves the gypsum law desulfurization in-process commonly used, and the efficiency of the not good desulfurization of setting of device is low, and desulfurization effect is not good, still has the dangerous problem of handling the incomplete.
Description
Technical Field
The utility model relates to an environmental protection equipment technical field, concretely relates to exhaust gas desulfurization administers device.
Background
The waste gas refers to toxic and harmful gas discharged by human in the production and living process. Especially chemical plants, steel plants, pharmaceutical plants, coking plants, oil refineries and the like, and the human life brings about the generation of domestic waste gas, the discharged waste gas has large smell, seriously pollutes the environment and affects the human health.
Industrial waste gases emitted by various production enterprises are important sources of atmospheric pollutants. If a large amount of industrial waste gas is discharged into the atmosphere after reaching the standard without treatment, the quality of the atmospheric environment is inevitably reduced, serious harm is brought to the human health, and huge loss is caused to national economy. After toxic and harmful substances in industrial waste gas enter a human body through respiratory tract and skin, the long-term low-concentration or short-term high-concentration contact can cause temporary and permanent pathological changes of systems and organs such as breath, blood, liver and the like of the human body, and particularly benzopyrene polycyclic aromatic hydrocarbons can directly cause carcinogenesis of the human body to draw high attention to human beings.
Industrial waste gases include organic waste gases and inorganic waste gases. The organic waste gas mainly comprises various hydrocarbons, alcohols, aldehydes, acids, ketones, amines and the like; the inorganic exhaust gas mainly includes sulfur oxides, nitrogen oxides, carbon oxides, halogens and compounds thereof, and the like.
At present, most of the existing waste gas treatment places are factories, particularly some factories with waste gas generation and emission, and the waste gas can be discharged only after being treated to reach the environmental protection standard. The gypsum slurry discharged from the absorption tower is concentrated and dehydrated to make the water content less than 10%, then the gypsum slurry is conveyed to a gypsum storage bin by a conveyor to be stacked, the desulfurized flue gas is treated by a demister to remove fog drops, and the flue gas is heated by a heat exchanger to be heated and then is discharged into the atmosphere through a chimney.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a device is administered in desulfurization of waste gas, solves the gypsum method desulfurization in-process commonly used, and the device set up the not desulfurated inefficiency well, and desulfurization effect is not good, still has the dangerous problem of handling the incomplete.
In order to solve the technical problem, the utility model adopts the following technical scheme:
a waste gas desulfurization treatment device comprises a settling tank and a detection system; the settling tank comprises a closed tank body, a liquid feeding pipe, an air outlet, an air inlet, a discharging drawer, a pump, a blanking port, a liquid return pipe, a partition plate, a liquid collecting tank, a filter tank and a sealing door; the baffle is arranged in a conical shape, the baffle is arranged in the middle of the box body to divide the box body into two parts, namely a filter box and a liquid collecting box which react with waste gas, the liquid adding pipe is arranged at the top of the filter box, the gas outlet is arranged at the top of one side of the liquid adding pipe, the gas inlet is arranged at the middle lower part of the other side of the filter box, the blanking port is arranged in the center of the baffle, and the blanking port is provided with an electromagnetic valve connected to a controller; the bottom of the discharging drawer is provided with a filter screen, the discharging drawer is arranged in the middle of the liquid collecting box, a sliding groove for placing the discharging drawer is formed in the side wall of the liquid collecting box, the discharging drawer is arranged in the sliding groove in a sliding mode, a sealing door is arranged at the discharging drawer to seal the whole discharging drawer opening, one end of the liquid return pipe is connected to the bottom of the liquid collecting box, the other end of the liquid return pipe is connected to the filter box arranged on one side of the air inlet, and the pump is arranged on the liquid return pipe and connected to the controller;
the detection system comprises an infrared gas analyzer, a full-automatic chemical analyzer and a water tank; an air outlet pipe is arranged on an air outlet at one side of the box body of the settling tank, a first branch air pipe is arranged on the air outlet pipe, the water tank is connected and arranged on the first branch air pipe, and a branch pipe is arranged at the bottom of the water tank and connected to a full-automatic chemical analyzer; the water tank top is provided with pipe connection to air drying equipment, be provided with on the air drying equipment pipe connection to infrared gas analysis appearance, be provided with the second bronchus on the outlet duct and be connected to air drying equipment, the pipeline UNICOM at second bronchus and water tank top is provided with pipe connection to infrared gas analysis appearance on the pipeline at water tank top, the outlet duct end is provided with third branch pipe, second branch pipe, first branch pipe, is provided with the solenoid valve on each pipeline and is connected to the controller.
Furthermore, electromagnetic valves are arranged on the liquid adding pipe, the air outlet and the air inlet and connected to the controller, and a transparent observation port is arranged on the side wall of the filter box.
Further, liquid collecting box one side is provided with the increase pressure mouth and is connected to the air compressor machine, and the increase pressure mouth setting is in ejection of compact drawer top, is provided with solenoid valve and relief valve on the increase pressure mouth and is connected to the controller, be provided with pressure sensor in the liquid collecting box and be connected to the controller, pressure sensor sets up and is being close to increase pressure mouth department, liquid collecting box bottom is provided with the level gauge and is connected to the controller, the non-pressure type level gauge is chooseed for use to the level gauge.
Furthermore, the water tank is arranged in a flask shape, a water inlet is formed in the side wall of the water tank, a water pipe is arranged on the water inlet, a manual ball valve is arranged on the water pipe, a water discharge pipe is arranged on the bottom branch pipe, a manual ball valve is arranged on the water discharge pipe, and distilled water is arranged in the water tank
Furthermore, the setting tank side is provided with the second setting tank, and the second setting tank sets up to a conventional case, and the incasement is provided with the sodium carbonate solution of high concentration, is provided with on the second setting tank and detects the mouth of a river, and second branch pipe is connected to the second setting tank, is provided with the electromagnetism check valve on the second setting tank outlet pipe and is connected to the controller, be provided with the pump on the outlet duct.
Further, all the solenoid valves are connected to the same controller.
Compared with the prior art, the beneficial effects of the utility model are that:
this device cuts apart into two parts through the baffle with original box, separate two parts through a valve, make the processing procedure of waste gas can last the circulation always, and still utilize filterable useful filtrating recovery once more, prevent the wasting of resources, and, carry out at least threefold detection to the gas of getting rid of through adopting full automation chemical analysis appearance and infrared gas analysis appearance, through setting up reasonable connecting tube, multistage detection control, and return the processing, can effectually detect and handle waste gas, solve the gypsum method desulfurization in common use in-process, the efficiency of the good desulfurization of setting up of device is low, the desulfurization effect is not good, still there is the dangerous problem of handling the incomplete.
Drawings
Fig. 1 is the schematic diagram of the structure of the settling tank of the utility model.
Fig. 2 is the structure diagram of the detection system of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The exhaust gas desulfurization treatment device comprises a settling tank and a detection system; the sedimentation tank comprises a closed tank body 1, a liquid feeding pipe 2, an air outlet 3, an air inlet 4, a discharging drawer 8, a pump 10, a blanking port 11, a liquid return pipe 12, a partition plate 13, a liquid collecting tank 14, a filter tank 15 and a sealing door 16; in this device, box 1 sets up to a airtight and have certain volumetric box, specifically, in order to make things convenient for the recovery of useful moisture content in the deposit, uses baffle 13 to set up and to divide into two parts with box 1 in the middle part of box 1, is respectively for the rose box 15 with waste gas reaction and the header tank 14 of collecting the filtrating, in order to make things convenient for the emission of deposit, sets up baffle 13 into the coniform, and like this, the deposit that forms after waste gas and absorption liquid reaction just piles up here, conveniently discharges. In the whole structure, the liquid feeding pipe 2 is arranged at the top of the filter box 15, the air outlet 3 is arranged at the top of one side of the liquid feeding pipe 2, the air inlet 4 is arranged at the middle lower part of the other side of the filter box 15, so that air inlet and air outlet are facilitated, and in the using process, the structure in the filter box 15 can be designed according to the specific waste gas to be treated. In order to facilitate blanking, the blanking port 11 is arranged at a conical opening in the center of the partition plate 13, and the blanking port 11 is provided with an electromagnetic valve connected to a controller, so that after the sediment is accumulated to a certain volume, the electromagnetic valve is opened, the sediment falls into the liquid collecting tank 14, the electromagnetic valve is closed after the sediment falls, and the filter tank 15 becomes an independent tank body; in order to facilitate the separation of liquid and slag in the precipitate, a filter screen is arranged at the bottom of the discharging drawer 8, and the discharging drawer 8 is arranged in the middle of the liquid collecting box 14, so that the precipitate dropped from the discharging port 11 drops to the discharging drawer 8, and then is filtered by the discharging drawer 8 to separate filter residue from filtrate, and the filter residue and the filtrate are respectively recycled, specifically, a sliding groove for placing the discharging drawer 8 is arranged on the side wall of the liquid collecting box 14, the discharging drawer 8 is slidably connected in the sliding groove, and a sealing door 16 is arranged at the position of the discharging drawer 8 to seal the whole discharging drawer 8. The liquid return pipe 12 is connected with one end of the liquid return pipe and is arranged at the bottom of the liquid collecting tank 14, the other end of the liquid return pipe is connected with the filter tank 15 arranged on one side of the air inlet 4, the recovered filtrate is recovered into the filter tank 15 again for use, the pump 10 is arranged on the liquid return pipe 12 and is connected to the controller for providing power, a branch pipe is arranged on the liquid return pipe 12 and is connected to the waste liquid treatment pool, and an electromagnetic valve is arranged on the branch pipe and is connected to the controller. This device cuts apart into two parts through the baffle with original box, separates two not parts through a valve for the processing procedure of waste gas can last the circulation always, and still utilize filterable useful filtrating recovery once more, solves current settling tank and is carrying out the in-process that deposits, handles the precipitate again after discharging aqueous solution, still contains the material that can react with waste gas in the discharged aqueous solution, the comparatively serious problem of wasting of resources. When the device is used, a corresponding monitoring device is arranged on the air outlet 3 at the rear end and a pipe thereof to monitor whether the air meets the discharge standard or not, and simultaneously, whether the filtered filtrate can be reused or not is also monitored, and if not, the filtered filtrate can be directly discharged to a specified waste liquid treatment position for treatment.
Further advance toThe detection system comprises an infrared gas analyzer 21, a full-automatic chemical analyzer 22 and a first settling tank, wherein the infrared gas analyzer 21 is a Gasboard-3500 (conventional type) analyzer which adopts a non-dispersive infrared (NDIR) gas analysis technology and a long-life electrochemical sensing technology and can simultaneously measure CO and CO on line2、CH4、C3H8、O2、H2S and other gases, and the sensor adopts a dual-channel design and has strong stability; all parts in contact with the sample gas are made of heat-resistant and corrosion-resistant special stainless steel, polytetrafluoroethylene and the like, cross interference among multi-component measurement gases is avoided, and the measurement accuracy is high. The self-diagnosis function is provided, and the state of the sensor can be checked on line. The analysis instrument can be transmitted to a superior centralized control system through various interfaces, and the analysis instrument is high in automation and low in maintenance when being configured with a professional pretreatment scheme, can realize real-time online monitoring without manual watching, and greatly reduces the labor cost of enterprises.
The full-automatic chemical analyzer 22 adopts the latest Italian Smartchem 380 full-automatic chemical analyzer, and the Smartchem 380 full-automatic chemical analyzer is an intermittent chemical analyzer newly developed by AMS company, and the measurement of the analyzer keeps the advantages of all Smartchem chemical analyzers, but greatly improves the original system, so that the design is more compact and reasonable, and the sample measurement speed is higher. The whole system measurement process is controlled by a computer, and the operation process is simple. The detection and analysis result is accurate and reliable, and the detection and analysis device can be used for detecting and analyzing various salts and sulfides. The Clevelchem 380 full-automatic intermittent chemical analyzer is an analysis and test means for automating a colorimetric analysis method, completely simulates an artificial colorimetric method, adds a sample, a reagent and a color developing agent into a cuvette to generate color reaction, enables the concentration of a substance to be detected and the final color depth of a reaction solution to be in a direct proportion relationship, detects the light transmission intensity through a colorimeter to obtain corresponding absorbance, and then automatically calculates through a standard curve to obtain corresponding concentration. 119 samples with a plurality of parameters can be analyzed at one time, and all the steps are controlled by a sample injection arm and a computer, so that mechanization and intellectualization are fully realized.
The device also comprises a third branch pipe 17, a second branch pipe 18, a first branch pipe 19, a water tank 23 and a first settling tank 24;
an air inlet pipe 26 is connected and arranged at one end of the first settling tank 24, an air outlet pipe 27 is connected and arranged at the other end of the first settling tank 24, dust-containing waste gas is subjected to multi-stage treatment and then subjected to primary settling treatment in the first settling tank 24, required waste gas absorption liquid is filled in the first settling tank 24, the waste gas absorption liquid is specifically arranged according to different use environments, such as sulfide absorption, an alkali solution is used, a first branch pipe 28 is arranged on the air outlet pipe 27, the water tank 23 is connected and arranged on the first branch pipe 28, a branch pipe is arranged at the bottom of the water tank 23 and is connected to the full-automatic chemical analyzer 22, so that the absorbed waste gas is dissolved in the water solution after being discharged from the air outlet pipe 27, and then detection is carried out on the full-automatic chemical analyzer 22, and the discharged waste gas is detected to have no waste gas capable of being dissolved in water, and the waste, otherwise, processing is required again; the water tank 23 top is provided with pipe connection to air drying equipment 20, is provided with pipe connection to infrared gas analysis appearance 21 on the air drying equipment 20, and infrared gas analysis appearance 21 directly detects the combustion gas, and only when detecting qualified back, waste gas just can be discharged, otherwise need handle once more. It is not sufficient to detect only the gas that has been filtered by the water, so the outlet duct 27 is provided with a second branch duct 29 connected to the air drying device 20, so that the gas that has not been absorbed by the water is detected again, and only after the detection is qualified, the exhaust gas can be discharged, otherwise, the treatment needs to be performed again. The second branch pipe 29 is communicated with a pipeline at the top of the water tank 23, the pipeline at the top of the water tank 23 is provided with a pipeline connected to the infrared gas analyzer 21, so that gas which is not required to be dried can be detected, the tail end of the gas outlet pipe 27 is provided with a third branch pipe 17, a second branch pipe 18 and a first branch pipe 19, and each pipeline is provided with an electromagnetic valve connected to a controller.
In this device, the tail end of outlet pipe 27 is provided with third branch pipe 17, second branch pipe 18, first branch pipe 19, links to different places according to the knot difference of detection, only can discharge gas after all testing results are qualified, otherwise all need carry out the retreatment.
In this design, a concrete mode is through adding a certain amount of solution that contains calcium to the setting tank in, catalyze earlier before waste gas gets into the setting tank, catalytic reaction absorbs sulphur gas in the solution production sediment after waste gas gets into the setting tank, let the back through the filtration of ejection of compact drawer 8, finally take out the sediment and accomplish the purification absorption of sulphur containing waste gas. And the absorbed waste gas is subjected to two detection at the rear end, is discharged after reaching the discharge standard, and enters the second settling tank again for secondary treatment when not reaching the standard until being qualified.
Example 2:
on the basis of the above embodiment, in this embodiment, in order to facilitate detection and control, the liquid feeding pipe 2, the air outlet 3, and the air inlet 4 are provided with electromagnetic valves connected to a controller, and the side wall of the filter box 15 is provided with a transparent observation port 5.
Example 3:
on the basis of above-mentioned embodiment, in this embodiment, liquid collecting box 14 one side is provided with pressure inlet 6 and is connected to the air compressor machine, and pressure inlet 6 sets up in ejection of compact drawer 8 top, is provided with solenoid valve and relief valve on the pressure inlet 6 and is connected to the controller, be provided with pressure sensor 7 in the liquid collecting box 14 and be connected to the controller, pressure sensor 7 sets up and is being close to pressure inlet 6 department, liquid collecting box 14 bottom is provided with level gauge 9 and is connected to the controller, non-pressure type level gauge 9 is chooseed for use to level gauge 9. In the device, the liquid on the sediment is filtered by pressurizing, so that the liquid is more convenient to take out after being condensed into the sediment.
Example 4:
on the basis of the above embodiment, in this embodiment, the water tank 23 is set to be in a shape of a flask so as to conveniently collect and discharge liquid gas, a water inlet is formed in the side wall, a water pipe is arranged on the water inlet, a manual ball valve is arranged on the water pipe, a water discharge pipe is arranged on the bottom branch pipe, a manual ball valve is arranged on the water discharge pipe, and distilled water is arranged in the water tank 23.
Example 5:
on the basis of the above embodiment, in the present embodiment, the second settling tank 25 is disposed on one side of the settling tank, the second settling tank 25 is a conventional tank, a high-concentration sodium carbonate solution is disposed in the tank, the sulfur-containing gas that is not removed is absorbed by using the alkalinity of the sodium carbonate solution, a detection water gap is disposed on the second settling tank 25, the second settling tank 25 is connected to the second branch pipe 18, and the sulfur contained in the exhaust gas is not much after the first treatment in the second settling tank 25, but only a small amount of sulfur is affected and discharged, so the sodium carbonate solution can be used for removal, and the sodium carbonate solution is not lost. An electromagnetic check valve is arranged on the water outlet pipe and connected to the controller, and a pump is arranged on the air outlet pipe 27 and provides power support for the pipeline system.
Example 6:
on the basis of the above embodiments, in this embodiment, all the solenoid valves are connected to the same controller to facilitate unified coordination control.
Reference throughout this specification to "example 1", "example 2", "example 3", "example 4", and so forth, means that a particular feature, structure, or characteristic described in connection with the example is included in at least one embodiment described generally throughout this application. The appearances of the same phrase in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is submitted that it is within the scope of the invention to effect such feature, structure, or characteristic in connection with other embodiments.
Although the invention has been described herein with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this invention. More specifically, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, other uses will also be apparent to those skilled in the art.
Claims (6)
1. The utility model provides a waste gas desulfurization treatment device which characterized in that: comprises a settling tank and a detection system; the settling tank comprises a closed tank body (1), and further comprises a liquid feeding pipe (2), an air outlet (3), an air inlet (4), a discharging drawer (8), a pump (10), a blanking port (11), a liquid return pipe (12), a partition plate (13), a liquid collecting tank (14), a filter tank (15) and a sealing door (16); the device comprises a box body (1), a baffle (13), a liquid adding pipe (2), a gas outlet (3), a gas inlet (4), a baffle (13), a liquid collecting tank (14), a filter tank (15) and a liquid adding pipe (2), wherein the baffle (13) is arranged in the middle of the box body (1) to divide the box body (1) into two parts, the two parts are respectively a filter tank (15) and a liquid collecting tank (14) which react with waste gas, the liquid adding pipe (2) is arranged at the top of the filter tank (15), the gas outlet is arranged at the top of one side of the liquid adding pipe (2), the gas inlet (4) is arranged at the middle lower part of the other side of the filter tank (; the bottom of the discharging drawer (8) is provided with a filter screen, the discharging drawer (8) is arranged in the middle of the liquid collecting box (14), a sliding groove for placing the discharging drawer (8) is formed in the side wall of the liquid collecting box (14), the discharging drawer (8) is arranged in the sliding groove in a sliding mode, a sealing door (16) is arranged at the discharging drawer (8) to seal the opening of the whole discharging drawer (8), one end of the liquid return pipe (12) is connected to the bottom of the liquid collecting box (14), the other end of the liquid return pipe is connected to the filter box (15) arranged on one side of the air inlet (4), and the pump (10) is arranged on the liquid return pipe (12) and connected to the controller;
the detection system comprises an infrared gas analyzer (21), a full-automatic chemical analyzer (22) and a water tank (23); an air outlet pipe (27) is arranged on an air outlet (3) at one side of the settling tank body (1), a first air branch pipe (28) is arranged on the air outlet pipe (27), the water tank (23) is connected and arranged on the first air branch pipe (28), and a branch pipe connected to a full-automatic chemical analyzer (22) is arranged at the bottom of the water tank (23); the top of the water tank (23) is provided with a pipeline connected to the air drying equipment (20), the air drying equipment (20) is provided with a pipeline connected to the infrared gas analyzer (21), the air outlet pipe (27) is provided with a second branch pipe (29) connected to the air drying equipment (20), the second branch pipe (29) is communicated with the pipeline at the top of the water tank (23), the pipeline at the top of the water tank (23) is provided with a pipeline connected to the infrared gas analyzer (21), the tail end of the air outlet pipe (27) is provided with a third branch pipe (17), the second branch pipe (18) and the first branch pipe (19), and each pipeline is provided with an electromagnetic valve connected to the controller.
2. The exhaust gas desulfurization treatment device according to claim 1, wherein: the liquid adding pipe (2), the gas outlet (3) and the gas inlet (4) are provided with electromagnetic valves connected to a controller, and the side wall of the filter box (15) is provided with a transparent observation port (5).
3. The exhaust gas desulfurization treatment device according to claim 1, wherein: liquid collecting box (14) one side is provided with pressure port (6) and is connected to the air compressor machine, and pressure port (6) set up in ejection of compact drawer (8) top, is provided with solenoid valve and relief valve on pressure port (6) and is connected to the controller, be provided with pressure sensor (7) in liquid collecting box (14) and be connected to the controller, pressure sensor (7) set up and locate being close to pressure port (6), liquid collecting box (14) bottom is provided with level gauge (9) and is connected to the controller, non-pressure formula level gauge (9) are chooseed for use in level gauge (9).
4. The exhaust gas desulfurization treatment device according to claim 1, wherein: the water tank (23) is in a flask shape, a water inlet is formed in the side wall of the water tank, a water pipe is arranged on the water inlet, a manual ball valve is arranged on the water pipe, a water discharge pipe is arranged on the bottom branch pipe, the manual ball valve is arranged on the water discharge pipe, and distilled water is arranged in the water tank (23).
5. The exhaust gas desulfurization treatment device according to claim 1, wherein: the device is characterized in that a second settling tank (25) is arranged on one side of the settling tank, a high-concentration sodium carbonate solution is arranged in the second settling tank (25), a detection water gap is formed in the second settling tank (25), the second settling tank (25) is connected with a second branch pipe (18), an electromagnetic check valve is arranged on a water outlet pipe of the second settling tank (25) and connected to a controller, and a pump is arranged on the air outlet pipe (27).
6. The exhaust gas desulfurization treatment device according to claim 1, wherein: all solenoid valves are connected to the same controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021424447.9U CN212999255U (en) | 2020-07-20 | 2020-07-20 | Waste gas desulfurization treatment device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021424447.9U CN212999255U (en) | 2020-07-20 | 2020-07-20 | Waste gas desulfurization treatment device |
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| Publication Number | Publication Date |
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| CN212999255U true CN212999255U (en) | 2021-04-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021424447.9U Active CN212999255U (en) | 2020-07-20 | 2020-07-20 | Waste gas desulfurization treatment device |
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| CN (1) | CN212999255U (en) |
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