CN109260889A - A kind of deep-purifying method and device painting spary air pollutants - Google Patents
A kind of deep-purifying method and device painting spary air pollutants Download PDFInfo
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- CN109260889A CN109260889A CN201811355364.6A CN201811355364A CN109260889A CN 109260889 A CN109260889 A CN 109260889A CN 201811355364 A CN201811355364 A CN 201811355364A CN 109260889 A CN109260889 A CN 109260889A
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- Prior art keywords
- filter
- paint
- fog
- coating cloud
- filter medium
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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
-
- 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
- B01D46/30—Particle separators, e.g. dust precipitators, using loose filtering material
- B01D46/32—Particle separators, e.g. dust precipitators, using loose filtering material the material moving during filtering
-
- 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
- B01D46/66—Regeneration of the filtering material or filter elements inside the filter
- B01D46/74—Regeneration of the filtering material or filter elements inside the filter by forces created by movement of the filter element
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/708—Volatile organic compounds V.O.C.'s
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0258—Other waste gases from painting equipments or paint drying installations
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- Chemical & Material Sciences (AREA)
- 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 present invention provides a kind of deep-purifying method for painting spary air pollutants, the exhaust gas that Painting Shop is generated first is collected by pipeline, into in the cavity for the paint-fog filter for filling filter medium, exhaust gas passes through filter medium from bottom to top, solid-state coating cloud substance in exhaust gas is adhered to filter media surface, and the gaseous pollutant in exhaust gas escapes after passing through filter medium from paint-fog filter top；Meanwhile the agitating device started in paint-fog filter is stirred filter medium, is adhered to be stirred continuously rubbing action under desiccation of the coating cloud in filter medium of filter media surface, loses viscosity and separates with filter medium, falls into paint-fog filter bottom；Exhaust gas realizes the purification separation of coating cloud after paint-fog filter is handled, and the gaseous pollutant in exhaust gas is sent into active carbon adsorber and carries out adsorption cleaning, is most discharged into atmosphere through chimney afterwards.Processing unit of the present invention is simple, process flow is short, without secondary pollution.
Description
Technical field:
The present invention relates to field of environment engineering, and in particular to it is a kind of paint spary air pollutants deep-purifying method and
Device.
Technical background:
Haze weather is caused by many reasons, and VOCs has proven to one of those important origin cause of formation.According to Chinese Ministry of Environmental Protection
Relevant department's statistics, the past 5 years, about 61,500,000,000 yuan of investment demand of China environmental protection industry VOCs detecting instrument management project, wherein
The investment demand of the petrochemical industries such as refinery, alkene processed and PTA is 40,000,000,000 yuan.Petroleum refining and petrochemical industry, coal chemical industry, chemistry
Product storage and transportation etc. is the key industry of VOCs discharge.2017 since winter has set in, north of China Jing-jin-ji region, Shanxi, Shaanxi, Henan etc. 11
Area including a provinces and cities repeatedly meets with wide range of haze weather, and the haze that can't get rid of becomes again and again the topic to attract nation-wide attention
With whole people's pain spot.To improve air quality, China incorporates VOCs pollutant management among atmospheric environment protection schedule,
And a series of policy has been put into effect successively.
The production technology of the industries such as China's metal product processing at present, automobile manufacture, machine-building, office furniture manufacture is equal
It is be unable to do without spraying process, because spraying determines the appearance and weatherability of product.However, the atmosphere pollution of the process is more serious,
What engineering goods spraying in China's generallyd use is solvent based coating, a large amount of coating clouds can be generated in spraying process, and along with first
The organic exhaust gas such as benzene, dimethylbenzene, industrial naptha, alcohols, esters, these pollutant direct emissions not only pollute atmospheric environment simultaneously
High risks are caused to the health of people.Therefore, how effectively to solve spraying industry produced pollution gas becomes very
Urgently.
Lacquer spraying technique use spray painting raw material --- coating is made of non-volatile part and fugitive constituent, non-volatile part include film forming
Substance and auxiliary film forming matter, fugitive constituent refer to solvent and diluent.Organic gas in lacquer spraying waste gas comes from solvent and diluent
Volatilization, organic solvent will not be attached to object being painted surface with paint, form all release in spray painting and solidification process organic
Exhaust gas has a large amount of coating cloud solid particle in painting process and generates.Lacquer spraying waste gas results from the spray painting work of Workpiece coating
Platform, the paint that pressure-air ejects largely stay on workpiece, other as exhaust gas is taken out of, form coating cloud dust.Spray painting
Coating cloud particle is small in exhaust gas, viscosity is big, easy coherent substance surface；Many environmental protection equipments can only handle organic exhaust gas, and coating cloud
Processing can not remove.Coating cloud dust content is not high, and partial size is smaller, and the overwhelming majority is at 10 μm hereinafter, adopting if unprocessed
With activated carbon capillary can be blocked when activated carbon adsorption quickly, active carbon is made to fail.Coating cloud must be removed before cleaning organic waste gas.It passes
The coating cloud minimizing technology of system generally uses rinsing type paint spray booth or spray column, and this method purification efficiency is low, is unable to reach pre-treatment
It is required that and wet process will cause various secondary pollution problems.
The coating cloud and VOCs in lacquer spraying waste gas are how effectively purified, is the problem of current lacquer spraying waste gas Treatment process.At present
Traditional processing method, it is main in such a way that wet process removes coating cloud.It mainly include water rotation venturi and water-screen cabinet processing, water rotation text
In mound and water-screen cabinet is very limited to the capturing ability of coating cloud, although being added to the chemical agent that flocculation captures in water, we
It is to be understood that there is solid matter (Yan Liao ﹑ titanium dioxide in spray paint) and liquid (resin), resin be with liquid
The form of functional group is there are in coating cloud, and our water rotation venturi and water-screen cabinet are to have to the solid matter crossed in spray paint
What ability captured, the functional group of liquid especially resin can not be captured.When environmental requirement is not high, water revolves literary mound
In and water-screen cabinet be the requirement for being able to satisfy that period, environmental requirement instantly has increased to very high standard, this is just needed
It is revolved in water and installs abatement equipment additional behind venturi and water-screen cabinet, at this moment water rotation venturi and water-screen cabinet are just unable to satisfy abatement equipment
Demand because the functional group of liquid such as resin that water rotation venturi and water-screen cabinet can not capture can be to abatement equipment
Cause destructive destruction.Dry method has become the technology trends of the waste gas pollution control and treatment containing coating cloud except coating cloud.And dry-method removal method
Generally existing adhesion equipment leads to not the problem of operation.
The present invention utilizes the principle of particulate filter, using the technological means of mechanical disturbance, develops a kind of efficiently net
The method and apparatus for changing lacquer spraying waste gas, achieve unexpected technical effect.
Summary of the invention:
In view of the above-mentioned deficiencies in the prior art, it is an object of the present invention to which it is net to provide a kind of depth for painting spary air pollutants
Change method and device, efficient removal coating cloud purifying VOCs avoid secondary pollution.
The present invention is a kind of deep-purifying method for painting spary air pollutants, is achieved through the following technical solutions:
1), the lacquer spraying waste gas for generating painting workshop is collected by pipeline, is sent into paint-fog filter；
2), lacquer spraying waste gas enters in the cavity for the paint-fog filter for filling filter medium, and lacquer spraying waste gas passes through from bottom to top
Filter medium, the solid-state coating cloud substance in lacquer spraying waste gas are adhered to filter media surface, the gaseous pollutant in lacquer spraying waste gas
By being escaped after filter medium from paint-fog filter top；Meanwhile starting the agitating device in paint-fog filter to filter medium
It is stirred, is adhered to be stirred continuously rubbing action under desiccation of the coating cloud in filter medium of filter media surface, loses viscous
Property is separated with filter medium, falls into paint-fog filter bottom；
3), lacquer spraying waste gas realizes the purification separation of coating cloud after paint-fog filter is handled, and the gaseous state in lacquer spraying waste gas is dirty
Dye object, which is sent into active carbon adsorber, carries out adsorption cleaning, is most discharged into atmosphere through chimney afterwards.
In the step 2), the filter medium is Ceramic Balls, one kind of metal ball and baton round.
In the step 2), the filter medium be the stainless steel metal ball that diameter is 20mm and diameter be 30mm not
The mixture of rust steel metal ball.
In the step 2), the filter medium be the diameter that mass ratio is 1:1 be 20mm stainless steel metal ball and
Diameter is the mixture of 30mm stainless steel metal ball.
In the step 2), the revolving speed of the agitating device is 1-10rpm.
VOCs concentration is not more than 500mg/m in the exhaust gas containing coating cloud3。
A kind of device for the deep-purifying method for painting spary air pollutants of the present invention, including paint-fog filter (1),
Active carbon adsorber (9) and chimney (12), the paint-fog filter (1) is internal to be provided with agitating device (6), the agitating device
(6) agitating shaft (7) protrudes through movable sealing sleeve (2) at the top of paint-fog filter (1) and is connected with motor (3), the coating cloud mistake
Filter (1) bottom and top are respectively provided with paint-fog filter air inlet (5) and paint-fog filter gas outlet (4), the coating cloud
Filter outlet mouth (4) is connected by pipeline with active carbon adsorber entrance (8), and the active carbon adsorber outlet (10) is logical
Piping is successively connected with blower (11) and chimney (12) respectively.
The working principle of the invention is summarized as follows:
A kind of deep-purifying method for painting spary air pollutants of the present invention, is first filtered lacquer spraying waste gas using coating cloud
Device removes coating cloud, is sent into purifying VOCs in active carbon adsorber, last qualified discharge after removing coating cloud.
Using porcelain ball, metal ball and baton round as filter medium, lacquer spraying waste gas coating cloud in the paint-fog filter of use
After filter process, coating cloud is adhered to filter media surface, start agitating device in paint-fog filter to filter medium into
Row stirring；Be adhered to the coating cloud of filter media surface filter medium be stirred continuously rubbing action under fall off.
After paint-fog filter removes coating cloud, gaseous pollutant is contained only in lacquer spraying waste gas, is sent into active carbon adsorber
Waste gas purification can be handled, be avoided because coating cloud adhesion activity charcoal causes the duct of active carbon to block, so that waste gas pollution control and treatment
Equipment stable operation.
In coating cloud purifying step, in such a way that physics intercepts, so that the coating cloud particle of solid is intercepted at filtering and is situated between
Matter surface, while by mechanical stirring, promote filter medium to move, prevent entire plugged filter, is moved through in filter medium
Cheng Zhong, other than rubbing action occurs with blender, main is mutual rubbing action between filter medium, passes through rubbing action
Coating cloud particle is caused to fall off.
During selecting filter medium, we have selected porcelain ball, metal ball and baton round, and change different-diameter
Ball carries out mixing as filter medium, discovery: using different-diameter filter ball as filter medium removal effect than list
The removal effect of one diameter will be got well；It is filtered using metal ball and is got well than using the removal effect of porcelain ball or baton round.
Wherein good using the removal effect of metal ball, main principle is:
Metal ball generates a large amount of frictional heat, these heats act on coating cloud particle, coating cloud during continuous friction
The rapid desiccation of particle, loses viscosity after desiccation, falls off under rubbing action from metal ball surface and falls into paint-fog filter bottom.Paint
In the presence of moisture, viscous stickiness is very big for mist particle, is adsorbed on filter media surface and is difficult to fall off, once removing moisture, paint
Mist particle loses viscosity, and coating cloud particle falls off from metal ball surface in whipping process, and the physics of metal ball filter medium intercepts
Effect is good, and there is no the risks of coating cloud blocking filter.
It is unexpected that technical effect has been obtained as filter medium using metal ball.
Beneficial effects of the present invention:
1, coating cloud is first filtered using the paint-fog filter of granulated filler and carries out VOCs adsorption cleaning again, given full play to each
The processing advantage of clean unit guarantees that system stablizes effectively operation.
2, the paint-fog filter used is customized for filtering coating cloud, fully takes into account that coating cloud viscosity is big, is not easy using general
The characteristics of logical filtering material filtering, processing is filtered using particulate filter；In particulate filter treatment process, adopt
Promote granular filter medium to run with blender, prevents plugged filter.
3, the present invention solves the dry filtration problem of coating cloud improvement, also avoids simultaneously by design pretreatment unit
Because of the corrosion of equipment caused by wet-treating and secondary pollution problem.
4, the filter medium using metal ball as paint-fog filter has obtained unexpected technical effect；In order to anti-
The only stirring that coating cloud blocking filter carries out, causes metal ball to generate frictional heat in the process of running, after being transmitted to coating cloud particle,
It is rapidly separated filter medium after coating cloud particle dehydration desiccation, greatly improves filter removal efficiency.
5, the present invention devises that processing unit is simple, process flow is short, without secondary pollution.
Detailed description of the invention:
Fig. 1 is a kind of schematic device of the purification method of exhaust gas containing coating cloud；
Wherein, 1, paint-fog filter；2, movable sealing sleeve；3, motor；4, paint-fog filter exports；5, paint-fog filter enters
Mouthful；6, agitating device；7, agitating shaft；8, active carbon adsorber entrance；9, property charcoal absorber；10, property charcoal absorber exports；11,
Blower；12, chimney.
Specific embodiment:
Embodiments of the present invention are as follows:
By installing set of device, including paint-fog filter (1), active carbon adsorber (9) and chimney (12), the coating cloud
Agitating device (6) are provided with inside filter (1), the agitating shaft (7) of the agitating device (6) is at the top of paint-fog filter (1)
It protrudes through movable sealing sleeve (2) to be connected with motor (3), paint-fog filter (1) bottom and top are respectively provided with coating cloud mistake
Filter air inlet (5) and paint-fog filter gas outlet (4), the paint-fog filter gas outlet (4) are inhaled by pipeline and active carbon
Adnexa entrance (8) is connected, active carbon adsorber outlet (10) by pipeline distinguish successively with blower (11) and chimney (12)
It is connected.
Embodiment 1
By the diameter that mass ratio is 1:1 be 20mm stainless steel metal ball and diameter be 30mm stainless steel metal ball it is mixed
It closes object to be fitted into paint-fog filter internal cavity, connects package unit.
The 1000m that painting workshop is generated3/ h lacquer spraying waste gas is collected by pipeline, is sent into the paint for filling stainless steel metal ball
In the cavity of mist resistant filter, lacquer spraying waste gas passes through filter medium from bottom to top, and the solid-state coating cloud substance in lacquer spraying waste gas is attached
It escapes after the gaseous pollutant in stainless steel metal ball surface, lacquer spraying waste gas is by stainless steel metal ball from paint-fog filter top
Out；Meanwhile the agitating device started in paint-fog filter is stirred stainless steel metal ball, the revolving speed of agitating device is
5rpm is adhered to coating cloud desiccation in the case where being stirred continuously rubbing action of stainless steel metal ball surface, loses viscosity and stainless steel
Metal ball separation, falls into paint-fog filter bottom；Lacquer spraying waste gas realizes the purification point of coating cloud after paint-fog filter is handled
From the gaseous pollutant in lacquer spraying waste gas, which is sent into active carbon adsorber, carries out adsorption cleaning, is most discharged into atmosphere through chimney afterwards.
Test effect:
1, paint-fog filter entrance and the pressure difference of paint-fog filter outlet are 215Pa；Filtration system and blower can be stablized
Operation；
2, the dust by dust concentration detector and dust concentration detector to paint-fog filter entrance, TVOC concentration
It is detected, dust, the TVOC of the dust of paint-fog filter outlet, TVOC concentration and active carbon adsorber outlet is examined
It surveys, the results are shown in Table 1:
The exhaust-gas treatment effect of 1 metal ball of table filling paint-fog filter
Embodiment 2
By the diameter that mass ratio is 1:1 be 20mm baton round and diameter be 30mm baton round mixture be packed into coating cloud
In filter interior cavity, package unit is connected.
The lacquer spraying waste gas 1000m that painting workshop is generated3/ h is collected by pipeline, is sent into the coating cloud filtering for filling baton round
In the cavity of device, lacquer spraying waste gas passes through filter medium from bottom to top, and the solid-state coating cloud substance in lacquer spraying waste gas is adhered to plastics
Ball surface, the gaseous pollutant in lacquer spraying waste gas after baton round from paint-fog filter top by escaping；Meanwhile starting coating cloud mistake
Agitating device in filter is stirred baton round, and the revolving speed of agitating device is 5rpm, and lacquer spraying waste gas passes through paint-fog filter
After processing, it is sent into active carbon adsorber and carries out adsorption cleaning, be most discharged into atmosphere through chimney afterwards.
Test effect:
1, paint-fog filter entrance and the pressure difference of paint-fog filter outlet are 1206Pa；Fan noise increases, blender
Stirring is difficult；Active carbon adsorber has clogging.
2, the dust of paint-fog filter entrance, TVOC concentration are carried out by dust concentration detector and TVOC detector
Detection detects dust, the TVOC of the dust of paint-fog filter outlet, TVOC concentration and active carbon adsorber outlet, ties
Fruit is as shown in table 2:
The exhaust-gas treatment effect of 2 baton round of table filling paint-fog filter
Embodiment 3
By the diameter that mass ratio is 1:1 be 20mm Ceramic Balls and diameter be 30mm Ceramic Balls mixture be packed into coating cloud
In filter interior cavity, package unit is connected.
The lacquer spraying waste gas 1000m that painting workshop is generated3/ h is collected by pipeline, is sent into the coating cloud filtering for filling Ceramic Balls
In the cavity of device, lacquer spraying waste gas passes through filter medium from bottom to top, and the solid-state coating cloud substance in lacquer spraying waste gas is adhered to ceramics
Ball surface, the gaseous pollutant in lacquer spraying waste gas after Ceramic Balls from paint-fog filter top by escaping；Meanwhile starting coating cloud mistake
Agitating device in filter is stirred Ceramic Balls, and the revolving speed of agitating device is 5rpm；Lacquer spraying waste gas passes through paint-fog filter
After processing, it is sent into active carbon adsorber and carries out adsorption cleaning, be most discharged into atmosphere through chimney afterwards.
Regulation effect:
1, paint-fog filter entrance and the pressure difference of paint-fog filter outlet are 1070Pa；Fan noise increases, blender
Stirring is difficult；Active carbon adsorber has clogging.
2, the dust of paint-fog filter entrance, TVOC concentration are carried out by dust concentration detector and TVOC detector
Detection detects dust, the TVOC of the dust of paint-fog filter outlet, TVOC concentration and active carbon adsorber outlet, ties
Fruit is as shown in table 3:
The exhaust-gas treatment effect of 3 Ceramic Balls of table filling paint-fog filter
Claims (7)
1. a kind of deep-purifying method for painting spary air pollutants, it is characterised in that: be achieved through the following technical solutions:
1), the lacquer spraying waste gas for generating painting workshop is collected by pipeline, is sent into paint-fog filter；
2), lacquer spraying waste gas enters in the cavity for the paint-fog filter for filling filter medium, and lacquer spraying waste gas passes through filtering from bottom to top
Medium, the solid-state coating cloud substance in lacquer spraying waste gas are adhered to filter media surface, and the gaseous pollutant in lacquer spraying waste gas passes through
It is escaped after filter medium from paint-fog filter top；Meanwhile starting the agitating device in paint-fog filter and filter medium is carried out
Stirring, be adhered to be stirred continuously rubbing action under desiccation of the coating cloud in filter medium of filter media surface, lose viscosity with
Filter medium separation, falls into paint-fog filter bottom；
3), lacquer spraying waste gas realizes the purification separation of coating cloud, the gaseous pollutant in lacquer spraying waste gas after paint-fog filter is handled
It is sent into active carbon adsorber and carries out adsorption cleaning, be most discharged into atmosphere through chimney afterwards.
2. a kind of deep-purifying method for painting spary air pollutants according to claim 1, it is characterised in that: described
In step 2), the filter medium is Ceramic Balls, one kind of metal ball and baton round.
3. a kind of deep-purifying method for painting spary air pollutants according to claim 2, it is characterised in that: described
In step 2), the filter medium is the stainless steel metal ball that diameter is 20mm and diameter is the mixed of 30mm stainless steel metal ball
Close object.
4. a kind of deep-purifying method for painting spary air pollutants according to claim 3, it is characterised in that: described
In step 2), the filter medium be the stainless steel metal ball that the diameter that mass ratio is 1:1 is 20mm and diameter be 30mm not
The mixture of rust steel metal ball.
5. a kind of deep-purifying method for painting spary air pollutants according to claim 4, it is characterised in that: described
In step 2), the revolving speed of the agitating device is 1-10rpm.
6. a kind of deep-purifying method for painting spary air pollutants according to claim 1, it is characterised in that: described
Exhaust gas containing coating cloud in VOCs concentration be not more than 500mg/m3。
7. a kind of device of deep-purifying method for painting spary air pollutants according to claim 1, feature exist
In: including paint-fog filter (1), active carbon adsorber (9) and chimney (12), it is provided with and stirs inside the paint-fog filter (1)
Mix device (6), the agitating shaft (7) of the agitating device (6) protruded through at the top of paint-fog filter (1) movable sealing sleeve (2) with
Motor (3) is connected, and paint-fog filter (1) bottom and top are respectively provided with paint-fog filter air inlet (5) and coating cloud mistake
Filter gassing mouth (4), the paint-fog filter gas outlet (4) are connected by pipeline with active carbon adsorber entrance (8), the work
Property charcoal absorber outlet (10) by pipeline distinguish successively be connected with blower (11) and chimney (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811355364.6A CN109260889A (en) | 2018-11-14 | 2018-11-14 | A kind of deep-purifying method and device painting spary air pollutants |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811355364.6A CN109260889A (en) | 2018-11-14 | 2018-11-14 | A kind of deep-purifying method and device painting spary air pollutants |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109260889A true CN109260889A (en) | 2019-01-25 |
Family
ID=65188967
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811355364.6A Withdrawn CN109260889A (en) | 2018-11-14 | 2018-11-14 | A kind of deep-purifying method and device painting spary air pollutants |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112090194A (en) * | 2020-08-20 | 2020-12-18 | 王艳伟 | Regrowth type self-deoiling device for filtering oily waste gas |
-
2018
- 2018-11-14 CN CN201811355364.6A patent/CN109260889A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112090194A (en) * | 2020-08-20 | 2020-12-18 | 王艳伟 | Regrowth type self-deoiling device for filtering oily waste gas |
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Application publication date: 20190125 |