CN207738709U - A kind of multifunctional combined scrubbing tower - Google Patents
A kind of multifunctional combined scrubbing tower Download PDFInfo
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- CN207738709U CN207738709U CN201721756469.3U CN201721756469U CN207738709U CN 207738709 U CN207738709 U CN 207738709U CN 201721756469 U CN201721756469 U CN 201721756469U CN 207738709 U CN207738709 U CN 207738709U
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Abstract
The utility model is related to a kind of multifunctional combined scrubbing towers, including be integrated in successively from bottom to top in a tower body wash naphthalene section, cold section eventually, desulfurization section and wash ammonia section, wherein wash ammonia section include set gradually from bottom to top wash three sections of ammonia, wash two sections of ammonia, alkali wash section and wash one section of ammonia, separated respectively by the disconnected tower tray set on bottom between above-mentioned each functional section, filler and liquid distribution device are equipped with above the disconnected tower tray in each functional section tower body；Gas entry is opened up on the tower body washed below naphthalene section filler, and demister and purified gas outlet are set at the top of tower body；The utility model will wash naphthalene, eventually cold, desulfurization and wash ammonia function and be integrated in a tower body; it is divided into a functional section by disconnected tower tray; coal gas is under the action of each functional section; temperature reduction is realized simultaneously; and the removing of naphthalene, ammonia, hydrogen sulfide, hydrogen cyanide; the rich solution that each functional section is formed recycles, and saves energy consumption, environmental protection.
Description
Technical field
The utility model is related to coke-oven-gas desulfurization and decyanation technical field in coking production more particularly to a kind of multifunctional combinations
Close scrubbing tower.
Background technology
Ammonia sulfur cycle washing method is one of common method of coke-oven-gas desulfurization and decyanation, which is with the ammonia in coke-stove gas
Alkali source, water containing ammonia are medium, and ammonia sulfur cycle washing removes the hydrogen sulfide in coke-stove gas；Mainly by wash mill and de-
Sour ammonia steaming device composition, wherein wash mill, which need to be equipped with, washes the equipment such as naphthalene tower, final cooling tower, desulfurizing tower, Ammonic washing tower.It is well known that
Tower investment is high, manufactures processing difficulties, and tower group takes up a large area, and construction investment expense is high.How equipment, soil are reduced
Investment is built, floor space is reduced, utilization rate of equipment and installations is improved, is each coke-oven plant problem urgently to be resolved hurrily.
Invention content
The utility model provides a kind of multifunctional combined scrubbing tower, will wash naphthalene, eventually cold, desulfurization and deacidifion function collection
In Cheng Yi tower body, a functional section is divided by disconnected tower tray, coal gas realizes temperature under the action of each functional section
It reduces and the removing of naphthalene, ammonia, hydrogen sulfide, hydrogen cyanide, the rich solution that each functional section is formed recycles, save energy consumption, protection ring
Border.
In order to achieve the above object, the utility model is realized using following technical scheme：
A kind of multifunctional combined scrubbing tower, including be integrated in successively from bottom to top in a tower body wash naphthalene section, eventually cold section,
Desulfurization section and wash ammonia section, wherein wash ammonia section include be arranged from bottom to top successively wash three sections of ammonia, wash two sections of ammonia, alkali wash section and wash ammonia
One section, naphthalene section is washed, at cold section of end, desulfurization section, three sections of ammonia is washed, washes two sections of ammonia, alkali wash section and wash between one section of ammonia respectively by being set to
The disconnected tower tray of bottom separates, and filler and liquid distribution device are equipped with above the disconnected tower tray in each functional section tower body；Naphthalene section is washed to fill out
Expect to open up gas entry on the tower body of lower section, demister and purified gas outlet are set at the top of tower body；
It is opened up on the tower body washed above naphthalene section liquid distribution device and washes benzene unit rich oil entrance, tower body bottom, which is set, washes benzene unit
Oil rich outlet；
Hydrogen sulfide rich solution outlet is set on the tower body below cold section of filler eventually, hydrogen sulfide rich solution outlet is separately connected reflux liquid pipe
Road and hydrogen sulfide rich solution conveyance conduit, the other end of reflux pipeline, which connects, to be opened up above cold section of liquid distribution device eventually on tower body
Phegma entrance, set phegma cooler on reflux pipeline；Outside the other end connection of hydrogen sulfide rich solution conveyance conduit
Deacidifion device；
Desulfurization section is divided into desulfurization section and lower desulfurization section；Hydrogen sulfide scrubber water is set on tower body above the disconnected tower tray of desulfurization section to go out
Mouthful, set hydrogen sulfide scrubber water inlet, hydrogen sulfide scrubber water out and hydrogen sulfide scrubber on cold section of tower body of end below the disconnected tower tray
Water inlet is connected by washings pipeline, and washing water cooler is set on washings pipeline；Upper desulfurization section and lower desulfurization section are corresponding
Deacidifion lean solution entrance is set respectively above liquid distribution device；
Cleaning mixture entrance, the tower body above corresponding disconnected tower tray are set on the tower body washed above one section of liquid distribution device of ammonia
On set cleaning mixture first outlet, set cleaning mixture first entrance on the tower body washed above two sections of liquid distribution devices of ammonia,
Cleaning mixture first outlet is connect with cleaning mixture first entrance by mixed liquor first pipe；
Cleaning mixture second outlet is set on the tower body washed above two sections of disconnected tower trays of ammonia, three sections of ammonia is washed below the disconnected tower tray
Set cleaning mixture second entrance on tower body, cleaning mixture second outlet and cleaning mixture second entrance pass through mixed liquor the
Two pipelines connect, and mixed liquor cooler is set on mixed liquor second pipe；
Rich solution outlet containing ammonia is set on the tower body washed above three sections of disconnected tower trays of ammonia, is set on the desulfurization section tower body below the disconnected tower tray
By containing the connection of ammonia rich solution pipeline, the pipeline of rich solution containing ammonia between rich solution entrance containing ammonia, rich solution outlet containing ammonia and rich solution entrance containing ammonia
On set the cooler of rich solution containing ammonia；
Alkali liquor inlet is set on tower body above alkali wash section liquid distribution device, and lye is set on the tower body below alkali wash section filler
Outlet.
Circumferentially arranged with multiple pipe nipples between the top plate and bottom plate of the disconnected tower tray, spiral board is set in pipe nipple.
Compared with prior art, the utility model has the beneficial effects that：
1) multiple functions are integrated in a tower body, replace multiple towers, utilization rate of equipment and installations bright with a tower
Aobvious to improve, equipment investment expense reduces；
2) reduce equipment occupation space, reduce construction investment expense；
3) after multitower merges, cancel multiple import and export gas pipings and holder, process pipe investment reduces；
4) it is matched with external deacidifion device, the rich solution of each functional section recycles in tower body, saves energy consumption；Drop
Low outer discharge capacity, environmental protection；
5) drop in gas can also effectively be removed by disconnected tower tray, ensures that each function washs stable, Effec-tive Function；
6) apparatus structure is compact, perfect, reasonable, saves space, reduces cost, small investment, low energy consumption.
Description of the drawings
Fig. 1 is a kind of structural schematic diagram of multifunctional combined scrubbing tower described in the utility model.
Fig. 2 is the structural schematic diagram of disconnected tower tray described in the utility model.
Fig. 3 is the A-A views in Fig. 2.
In figure：I. it washes naphthalene section 1. and washes naphthalene section liquid distribution device 2. and wash 3. demister of naphthalene section filler, 4. tower body II.
Cold section 5. cold section of filler 7. breaks desulfurization section liquid point on III, desulfurization sections 8. of tower tray cold section of liquid distribution device 6. eventually eventually eventually
IV, of the desulfurization section filler of desulfurization section liquid distribution device 11. times of desulfurization section filler 10. times washes ammonia one section 14. on cloth apparatus 9.
It washes one section of liquid distribution device 15. of ammonia and washes one section of V, of filler of ammonia and wash ammonia and wash two sections of liquid distribution devices 17. of ammonia for two section 16.
It washes two sections of VI, of filler of ammonia and washes ammonia and wash three sections of liquid distribution devices 19. of ammonia for three section 18. and wash three sections of fillers of ammonia, VII, alkali wash sections
12. 13. alkali wash section filler 14. of alkali wash section liquid distribution device breaks tower tray top plate 15. break 16. pipe nipple 17. of tower tray bottom plate rotation
18. phegma cooler 19. of flowing plate washs 20. mixed liquor cooler of water cooler, 21. cooler of rich solution containing ammonia
Specific implementation mode
Specific embodiment of the present utility model is described further below in conjunction with the accompanying drawings：
As shown in Figure 1, a kind of multifunctional combined scrubbing tower described in the utility model, including it is integrated in one successively from bottom to top
In a tower body wash naphthalene section I, cold section II eventually, desulfurization section III and wash ammonia section, wherein it includes setting gradually from bottom to top to wash ammonia section
Three section VI of ammonia is washed, two section V of ammonia, alkali wash section VII are washed and washes one section IV of ammonia, naphthalene section I is washed, cold section II of end, desulfurization section III, washes three sections of ammonia
VI, two section V of ammonia, alkali wash section VII are washed and is washed between one section IV of ammonia respectively by the separation of disconnected tower tray 7 set on bottom, each functional section
7 top of disconnected tower tray in tower body is equipped with filler and liquid distribution device；It washes on the tower body 4 of 2 lower section of naphthalene section filler and opens up coal gas
Entrance, 4 top of tower body set demister 3 and purified gas outlet；
It washes on the tower body 4 of 1 top of naphthalene section liquid distribution device to open up and washes benzene unit rich oil entrance, 4 bottom of tower body, which is set, washes benzene
Unit oil rich outlet；
Hydrogen sulfide rich solution outlet is set on the tower body 4 of cold section of 6 lower section of filler eventually, hydrogen sulfide rich solution outlet is separately connected phegma
The other end of pipeline and hydrogen sulfide rich solution conveyance conduit, reflux pipeline connects on cold section of 5 top tower body 4 of liquid distribution device eventually
The phegma entrance opened up sets phegma cooler 18 on reflux pipeline；The other end of hydrogen sulfide rich solution conveyance conduit connects
External deacidifion device；
Desulfurization section III divides for upper desulfurization section and lower desulfurization section；Desulfurization section III break the top of tower tray 7 tower body 4 on set hydrogen sulfide and wash
Water out is washed, hydrogen sulfide scrubber water inlet, hydrogen sulfide scrubber water out and sulphur are set on cold section of II tower body of end of 7 lower section of disconnected tower tray
Change hydrogen washing water inlet to connect by washings pipeline, washing water cooler 19 is set on washings pipeline；Upper desulfurization section and lower de-
Corresponding 8,10 top of liquid distribution device of sulphur section sets deacidifion lean solution entrance respectively；
It washes on the tower body 4 of one section of liquid distribution device of ammonia, 14 top and sets cleaning mixture entrance, corresponding 7 top of disconnected tower tray
Cleaning mixture first outlet is set on tower body 4, is washed on the tower body 4 of the top of two sections of liquid distribution devices of ammonia 16 and is set cleaning mixture the
One entrance, cleaning mixture first outlet are connect with cleaning mixture first entrance by mixed liquor first pipe；
It washes on the tower body 4 of two section of V disconnected tower tray of ammonia, 7 top and sets cleaning mixture second outlet, which washes
Cleaning mixture second entrance is set on three section of VI tower body of ammonia, cleaning mixture second outlet passes through with cleaning mixture second entrance
Mixed liquor second pipe connects, and mixed liquor cooler 20 is set on mixed liquor second pipe；
It washes on the tower body 4 of three section of VI disconnected tower tray of ammonia, 7 top and sets rich solution outlet containing ammonia, the desulfurization section III of 7 lower section of disconnected tower tray
Set rich solution entrance containing ammonia on tower body, rich solution outlet containing ammonia and between rich solution entrance containing ammonia by containing the connection of ammonia rich solution pipeline, contain ammonia
The cooler of rich solution containing ammonia 21 is set on rich solution pipeline；
Alkali liquor inlet is set on the tower body 4 of the top of alkali wash section liquid distribution device 12, on the tower body 4 of 13 lower section of alkali wash section filler
If lye export.
As shown in Figure 2 and Figure 3, short circumferentially arranged with multiple pipe nipples 16 between the top plate 14 and bottom plate 15 of the disconnected tower tray 7
Spiral board 17 is set in section 16.
Coal gas based on multifunctional combined scrubbing tower described in the utility model combines washing methods, includes the following steps：
It washes benzene unit rich oil to enter in tower body 4, the filler 2 of lower section is uniformly sprayed at after washing naphthalene section liquid distribution device 1
On, mass transfer is come into full contact with into the coal gas washed in naphthalene section I tower bodies in corresponding filler 2, while absorbing naphthalene in coal gas, is reduced
The temperature of coal gas absorbs the benzene unit rich oil of washing after naphthalene and is flowed out from bottom of tower, and temperature increases in the process；
Temperature declines after the washed water cooler 19 of hydrogen sulfide rich solution of III bottom of desulfurization section；Cold section II of phegma warp eventually
Temperature declines after phegma cooler 18, and the two respectively enters in cold section II of tower body 4 eventually, after liquid distribution device 5, under
It comes into full contact with coal gas in square filler 6 and cools down coal gas；Cold section of liquid is sent to external depickling steaming to residue in addition to phegma eventually
Ammonia device；
Lean solution from deacidifion device divides two-way to respectively enter in the tower body 4 of upper desulfurization section and lower desulfurization section；Wash ammonia
After the cooler of rich solution containing ammonia 21, temperature declines the rich solution containing ammonia of three section of VI bottom；Liquid through upper desulfurization section and lower desulfurization section
It is uniformly sprayed onto after distribution apparatus 8,10 on the filler 9,11 of lower section, rich solution containing ammonia fully connects with coal gas in corresponding filler 9,11
Mass transfer is touched, is reacted, the hydrogen sulfide in coal gas is absorbed；
Ammonia section is being washed, is decomposing the fixation ammonia salt in ammonium hydroxide using lye, the setting of alkali wash section VII is washing one section IV of ammonia and washing ammonia
Between two section V, can meet the needs of ammonia still process and further remove the hydrogen sulfide in coal gas；Liquid of the lye through alkali wash section
It after distribution apparatus 12, is come into full contact with coal gas in lower section filler 13, the lye after alkali cleaning is sent to deacidifion device；
The mixed liquor of water stripping and sulfuric acid enters in tower body 4 in deacidifion device, through washing one section IV of ammonia and washing two sections of ammonia
After V liquid distribution device 14,16 and the filler 15,17 of lower section, temperature rise；Mixed liquor is mixed liquid cooling but outside tower body 4
Device 20 enters after cooling down washes three section VI of ammonia, and the liquid distribution device 18 by washing three sections of ammonia is distributed in the filler 19 of lower section, is used
In removing the ammonia in coal gas, rich solution containing ammonia is formed；Rich solution containing ammonia recycles after the cooling of the cooler of rich solution containing ammonia 21；
Coal gas from bottom to top, after the synergy of each functional section in tower body 4, ammonia therein, hydrogen sulfide, hydrogen cyanide at
Divide and be washed down, most afterwards after the demister at top 3 removes droplet outside discharge tower body 4, is sent to and washes benzene unit.
When hypomere gas enters the disconnected tower tray 7 of top, under the demisting effect of spiral board 17, most of drop in gas
It is removed, gas is hit with top plate 14 upwards again, further removes remaining drop；Fully ensure that the list of each functional section absorbing liquid
Matter, reduce hybrid reaction, make each functional section washing efficiently, stable operation；The rich solution cascade utilization that each functional section is formed, most
End form is sent to deacidifion device at the rich solution containing ammonia and hydrogen sulfide.
Following embodiment is implemented under premised on technical solutions of the utility model, gives detailed embodiment
With specific operating process, but the scope of protection of the utility model is not limited to following embodiments.Side used in following embodiments
Method is conventional method unless otherwise instructed.
【Embodiment】
As shown in Figure 1, in the present embodiment, washes benzene unit rich oil E and enter in tower body 4, through washing naphthalene section liquid distribution device 1
It is uniformly sprayed at and washes 2 top of naphthalene section filler, mass transfer is come into full contact in naphthalene section filler 2 with coal gas washing, naphthalene is same in absorption coal gas
When and reduce the temperature of coal gas, finally flowed out from bottom of tower, temperature is increased to B2 by B1.
After the washed water cooler of the hydrogen sulfide rich solution A+C of III bottom of desulfurization section 19, temperature enters tower after dropping to C1 by C2
In body 4；The partial reflux liquid D in cold section II of phegma A+C+D is after phegma cooler 18 eventually, after temperature drops to C1 by C3
It into tower body 4, through cold section of liquid distribution device 5 eventually, is come into full contact with coal gas in cold section of filler 6 eventually, cooling coal gas；It is remaining
Cold section of phegma A+C eventually, is sent to deacidifion device and is handled.
Lean solution C from deacidifion device, temperature C3 divide two-way to enter in the tower body 4 of desulfurization section III；Wash three sections of ammonia
After containing rich ammonium hydroxide cooler 21, temperature enters after dropping to C3 by C4 in the tower body 4 of desulfurization section III A of rich solution containing ammonia of VI bottom；
Uniform sprinkling through upper desulfurization section liquid distribution device 8, lower desulfurization section liquid distribution device 10, rich solution containing ammonia and coal gas it is upper,
Mass transfer is come into full contact in lower desulfurization section filler 9,11, is reacted, the hydrogen sulfide in coal gas is absorbed.
In washing ammonia section, the fixation ammonia salt in ammonium hydroxide is decomposed using lye (NaOH), the utility model sets alkali wash section VII
It sets at the middle part for washing ammonia section, can meet the needs of washing ammonia and further removes the hydrogen sulfide in coal gas.In the present embodiment,
The NaOH solution B of a concentration of 2%-4% fills in alkali wash section filler 13 with coal gas after the distribution of alkali wash section liquid distribution device 12
Tap is touched, and lye recycles.
Water stripping in deacidifion device enters joint scrubbing tower with the sulfuric acid mixture liquid A that sulfuric acid pump comes, through washing ammonia one
After section IV, the liquid distribution device 14,16 for washing two section V of ammonia and corresponding filler 15,17, temperature is raised to C6 by C7；Mixed liquor is in tower
After being mixed 20 cooling of liquid cooler outside body 4, temperature is reduced to C5, is again introduced into joint scrubbing tower；Washing three sections of liquid distributions of ammonia
Device 18 is washed under the action of three sections of fillers 19 of ammonia, and the ammonia in coal gas is removed, and forms the A of rich solution containing ammonia that temperature is C4, rich solution containing ammonia
A is again introduced into joint scrubbing tower after the cooler of rich solution containing ammonia 21 is cooled to C3, recycles.
The coal gas G of temperature A1 enters from joint wash tower bottoms, after each functional section synergy, ammonia, sulphur in coal gas
Change the ingredients such as hydrogen, hydrogen cyanide to be washed down, most afterwards after the demister at top 3 removes droplet, tower is discharged after being reduced to A2 in temperature
Outside, it is sent to and washes benzene unit.
The preferable specific implementation mode of the above, only the utility model, but the scope of protection of the utility model is not
Be confined to this, any one skilled in the art within the technical scope disclosed by the utility model, according to this practicality
Novel technical solution and its utility model design are subject to equivalent substitution or change, should all cover the protection model in the utility model
Within enclosing.
Claims (2)
1. a kind of multifunctional combined scrubbing tower, which is characterized in that wash naphthalene including being integrated in successively from bottom to top in a tower body
Section, cold section eventually, desulfurization section and wash ammonia section, wherein wash ammonia section include set gradually from bottom to top wash three sections of ammonia, wash two sections of ammonia, alkali
Wash section and wash one section of ammonia, wash naphthalene section, cold section eventually, desulfurization section, wash three sections of ammonia, wash two sections of ammonia, alkali wash section and wash between one section of ammonia point
Do not separated by the disconnected tower tray set on bottom, filler and liquid distribution dress are equipped with above the disconnected tower tray in each functional section tower body
It sets；Gas entry is opened up on the tower body washed below naphthalene section filler, and demister and purified gas outlet are set at the top of tower body；
It is opened up on the tower body washed above naphthalene section liquid distribution device and washes benzene unit rich oil entrance, tower body bottom, which is set, washes benzene unit rich oil
Outlet；
Set hydrogen sulfide rich solution outlet on the tower body below cold section of filler eventually, hydrogen sulfide rich solution outlet be separately connected reflux pipeline and
Hydrogen sulfide rich solution conveyance conduit, the other end of reflux pipeline connect time opened up on tower body above cold section of liquid distribution device eventually
Flow liquid entrance sets phegma cooler on reflux pipeline；Depickling outside the other end connection of hydrogen sulfide rich solution conveyance conduit
Ammonia steaming device；
Desulfurization section is divided into desulfurization section and lower desulfurization section；Hydrogen sulfide scrubber water out is set on tower body above the disconnected tower tray of desulfurization section,
Hydrogen sulfide scrubber water inlet is set on cold section of tower body of end below the disconnected tower tray, hydrogen sulfide scrubber water out enters with hydrogen sulfide scrubber water
Mouth is connected by washings pipeline, and washing water cooler is set on washings pipeline；Upper desulfurization section and the corresponding liquid of lower desulfurization section
Deacidifion lean solution entrance is set respectively above distribution apparatus；
Cleaning mixture entrance is set on the tower body washed above one section of liquid distribution device of ammonia, is set on the tower body above corresponding disconnected tower tray
Cleaning mixture first outlet sets cleaning mixture first entrance on the tower body washed above two sections of liquid distribution devices of ammonia, washs
Mixed liquor first outlet is connect with cleaning mixture first entrance by mixed liquor first pipe；
Cleaning mixture second outlet is set on the tower body washed above two sections of disconnected tower trays of ammonia, three sections of tower bodies of ammonia are washed below the disconnected tower tray
On set cleaning mixture second entrance, cleaning mixture second outlet is managed with cleaning mixture second entrance by mixed liquor second
Road connects, and mixed liquor cooler is set on mixed liquor second pipe；
Rich solution outlet containing ammonia is set on the tower body washed above three sections of disconnected tower trays of ammonia, is set containing ammonia on the desulfurization section tower body below the disconnected tower tray
By containing the connection of ammonia rich solution pipeline between rich solution entrance, rich solution outlet containing ammonia and rich solution entrance containing ammonia, set on the pipeline of rich solution containing ammonia
The cooler of rich solution containing ammonia；
Alkali liquor inlet is set on tower body above alkali wash section liquid distribution device, setting lye on the tower body below alkali wash section filler goes out
Mouthful.
2. a kind of multifunctional combined scrubbing tower according to claim 1, which is characterized in that the top plate of the disconnected tower tray and bottom
Circumferentially arranged with multiple pipe nipples between plate, spiral board is set in pipe nipple.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721756469.3U CN207738709U (en) | 2017-12-15 | 2017-12-15 | A kind of multifunctional combined scrubbing tower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721756469.3U CN207738709U (en) | 2017-12-15 | 2017-12-15 | A kind of multifunctional combined scrubbing tower |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207738709U true CN207738709U (en) | 2018-08-17 |
Family
ID=63118224
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| Application Number | Title | Priority Date | Filing Date |
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| CN201721756469.3U Active CN207738709U (en) | 2017-12-15 | 2017-12-15 | A kind of multifunctional combined scrubbing tower |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107880947A (en) * | 2017-12-15 | 2018-04-06 | 中冶焦耐(大连)工程技术有限公司 | A kind of multifunctional combined scrubbing tower and coal gas combine washing methods |
| CN110523230A (en) * | 2019-09-27 | 2019-12-03 | 中冶焦耐(大连)工程技术有限公司 | A kind of energy-efficient deacidifion technique and system |
| CN113801705A (en) * | 2021-09-18 | 2021-12-17 | 中国五环工程有限公司 | Atmospheric gas purification system |
-
2017
- 2017-12-15 CN CN201721756469.3U patent/CN207738709U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107880947A (en) * | 2017-12-15 | 2018-04-06 | 中冶焦耐(大连)工程技术有限公司 | A kind of multifunctional combined scrubbing tower and coal gas combine washing methods |
| CN110523230A (en) * | 2019-09-27 | 2019-12-03 | 中冶焦耐(大连)工程技术有限公司 | A kind of energy-efficient deacidifion technique and system |
| CN113801705A (en) * | 2021-09-18 | 2021-12-17 | 中国五环工程有限公司 | Atmospheric gas purification system |
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