CN105289217B - VOCs recycling systems in a kind of waste gas - Google Patents
VOCs recycling systems in a kind of waste gas Download PDFInfo
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- CN105289217B CN105289217B CN201510082376.6A CN201510082376A CN105289217B CN 105289217 B CN105289217 B CN 105289217B CN 201510082376 A CN201510082376 A CN 201510082376A CN 105289217 B CN105289217 B CN 105289217B
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Landscapes
- Treating Waste Gases (AREA)
Abstract
The present invention relates to VOCs recycling systems in a kind of waste gas, including micropore absorption tower, absorption fluid circulation, absorption liquid cooling system, rich poor absorption fluid circulation, condenser system, surge tank and vavuum pump, it is sequentially connected by pipeline；The tail gas of vacuum gas pump floss hole is connected with the micropore absorption tower, is formed closed circuit circulatory system, is realized VOCs zero-emissions.VOCs of the present invention, which is recycled, uses closed cycle mode of operation, and absorption and desorption process is synchronously carried out, and improves operating efficiency, safe and reliable.
Description
Technical field
The present invention relates to environmental protection technical field, specifically discloses VOCs recycling systems in a kind of waste gas.
Background technology
VOC (VOCs) is the Typical Representative in atmosphere pollution, VOCs typically contain " triphen " (benzene,
Toluene, dimethylbenzene), aldehyde, halogenated hydrocarbons, polycyclic aromatic hydrocarbon, organic sulfur compound, the volatile organic contaminant such as organic nitrogen compound.With
Current haze weather takes place frequently, and the discharge as the VOCs in one of haze significant contribution source also result in great attention.VOCs is also
Easily it is combined together with the moisture in air, grit, is detrimental to health with respiratory system into human body, causes endocrine work(
Can be disorderly, the immunologic function of human body, respiratory tract, angiocarpy and central nervous system etc. are had an impact, and this kind of material is past
Acted on toward having bioaccumulation and " three cause " (carcinogenic, teratogenesis shape, mutagenesis).In addition, the life-span of this kind of material in the environment
It is longer, and by empty gas and water and species can be migrated make trans-regional or long-distance migration, accumulated in the environment or be converted into poison
The bigger secondary pollution of property, bigger threat is caused to ecological environment and health.Therefore, the pollution and control of VOCs gases
Problem processed is increasingly by the attention and concern of countries in the world.
According to《Long-term science and technology development planning outline (2006-2020) in country》In clearly will " comprehensive anti-pollution with
Recycling waste " is classified as major fields and its preferential theme.In State Council in 2013 with state's letter [2012] No. 146 texts batch
What the Chinese Ministry of Environmental Protection agreed to again promulgated《Key area prevention and control of air pollution " 12 " is planned》It is bright in (ring sends out [2012] No. 130 texts)
The control of volatile organic matter (VOCs) is really classified as to the emphasis of key area control, the construction for improving VOCs discharge intermediate items will
Ask, and carry out key industry improvement, improve VOCs prevention and cure of pollution systems, wherein particularly pointing out the row for strengthening volatile organic matter
Put control.
At present, VOCs Treatment process is broadly divided into decomposition method and recycling method.Decomposition method mainly using high temperature incineration,
It is catalyzed burning, biological oxidation, low temperature plasma destruction and photocatalysis oxidation technique etc..It is main in recycling method to include inhaling
Attached, absorption, condensation and membrane separating method.Decomposition method is due to being controlled by low processing cost height, purification efficiency, complex operation or presence
The shortcomings of secondary pollution and security difference, contaminating enterprises are generally difficult to receive.In contrast, recycling method not only effectively solves
VOCs pollution problems, while also some compositions can be recycled, therefore, recovery method is increasingly contaminated enterprise
Attention and widely used.Moreover, recoverying and utilizing method also complies with country to atmosphere pollution Comprehensive Control strategy.Such as to pass through
It is thorough to implement《Prevention and control of air pollution action plan》, petrochemical industry VOCs discharges are reduced, promotes ambient air quality to improve, pushes greatly
Enter petrochemical industry volatile organic matter (VOCs) pollution control, by 2017, it is whole that national petrochemical industry is basically completed VOCs synthesis
Control work, VOCs total emission volumns cut down more than 30% compared with 2014, to the technology waste gas with recovery value, storage tank tidal air and
Handling waste gas is recycled.
In recovery and utilization technology, condensation method is suitable for high concentration VOCs gas of the volume fraction more than 5% (usually more than
10,000ppm), the VOCs gases to more common of middle low concentration and do not apply to, moreover, in the waste gas after condensed, still
Not solidifying VOCs compositions containing higher concentration, it is still necessary to which follow-up Treatment process is effectively treated.Membrane separation process only limits at present
In the laboratory research stage, practical process is also introduced into.Absorption method mainly uses solid adsorption material such as activated carbon, molecular sieve,
Adsorption-desorption recycling is carried out to the VOCs in waste gas, is recovery and utilization technology most commonly used at present.But this method
Low adsorption capacity, non-selectivity absorption be present, sorbing material mechanical wear is very fast, regenerative process is complicated, operation cost is high, changes
The problems such as frequency height and security, and easily influenceed by aqueous vapor, dust, greasy dirt, temperature etc., therefore, this method is applied to useless more
Gas component is relatively single, the few occasion of impurity.
Solvent absorption turns into the first choice side for trapping VOCs in waste gas because of the advantages that use range is wide, operating process is simple
The purification technique of method and good development prospect.But there are the following problems in use for this method：
1st, the volatile loss of solvent, operating cost height is caused；
2nd, there is solution dehumidification while migration in absorption equipment, cause solvent to be escaped with flowing gas；
3rd, lyosoption is because of desorption difficulty, it is difficult to accomplish to recycle, it is typically disposable；
4th, to reach higher absorption efficiency, multistage absorption tower typically is used, brings equipment investment expense to improve；
5th, preferably promoted in the recycling field of oil gas, but in other field, also non-extensive use.
The content of the invention
It is an object of the invention to：There is provided that a kind of operating cost is low, and lyosoption used is recycled to solve problem above
It is high using, absorption efficiency and its absorption is wide, VOCs recycling systems in widely used waste gas.
The technical solution adopted in the present invention is such：
VOCs recycling systems in a kind of waste gas, including micropore absorption tower, absorption fluid circulation, absorbing liquid cooling system
System, rich poor absorption fluid circulation, condenser system, surge tank and vavuum pump, are sequentially connected by pipeline；The tail gas of vacuum gas pump
Floss hole is connected with the micropore absorption tower, forms closed circuit circulatory system, the micropore absorption tower includes tower body, micropore gas is cut
Cutter, air inlet, air outlet, feed tube, absorbing liquid overfall, evacuation port, the relatively described tower body of micropore gas cutter
It is radially arranged；The air inlet is arranged at the lower section of the micropore gas cutter, and the feed tube is arranged at the micropore gas
The top of body cutter, at the micropore gas cutter, tower body side wall export absorbing liquid overfall；In the tower body
Hook-type plate dehydrater is provided with above internal, described micropore gas cutter, is provided with liquid guide flow pipe, the suction thereunder
Receiving fluid circulation includes rich solution storage tank and elevator pump, and the rich solution storage tank is by pipeline respectively at institute on the micropore absorption tower
State feed tube, the connection of absorbing liquid overfall；The elevator pump is arranged at the pipeline that the rich solution storage tank connects with the feed tube
On, the poor fluid circulation that absorbs of the richness includes rich poor absorption liquid heat exchanger, head tank, scrapper thin film evaporator, lean solution storage
Tank, the rich solution storage tank bottom richness absorbing liquid outlet are sequentially connected the poor absorption liquid heat exchanger of the richness, head tank by pipeline
With scrapper thin film evaporator inlet, the scrapper thin film evaporator liquid outlet by pipeline be sequentially connected the poor liquid storage tank,
The rich poor poor absorbing liquid import for absorbing liquid heat exchanger and the rich solution storage tank top.
Further, the micropore gas cutter aperture is 0.3-0.85mm.
Further, air-introduced machine is set at the air outlet.
Further, the hook-type plate dehydrater is formed by arc is longitudinal spliced, and hook-type plate is set on the arc,
Hook-type plate concave surface and airflow direction are opposite；The adjacent arc distance between plates is 20-100mm.
Further, the absorption liquid cooling system is coil heat exchange device, and it is 5-10 DEG C to control absorbing liquid temperature.
Further, the condenser system includes multigroup condenser, is connected by pipeline with the scrapper thin film evaporator.
Further, the condenser has two groups, and supporting is provided with VOCs collecting tanks.
In summary, due to using above-mentioned technical proposal, the beneficial effects of the invention are as follows：
(1) micropore gas cutter is used in absorption tower, forms the gas of dispersed phase, and enter promoting the circulation of qi in microcellular structure
Liquid contacts, and enhances mass-transfer progress, meanwhile, the gas of dispersed phase passes through the liquid level of mobile phase, avoids solution dehumidification while migration, subtracts
The loss of absorbing liquid is lacked.
(2) absorbing liquid uses closed cycle mode of operation, and absorption and desorption process is synchronously carried out, and improves operating efficiency.
(3) fixed gas of vavuum pump discharge returns to absorption tower and reprocessed, and avoids secondary pollution, has accomplished VOCs
Zero-emission.
(4) rich poor absorption liquid heat exchanger is set, reduces energy consumption.
(5) low temperature absorption is used, improves the absorptive capacity of absorbing liquid, reduces the internal circulating load of absorbing liquid.
(6), can regenerable absorbent liquid in a short time using decompression scraper film evaporator.
(7) air-introduced machine is arranged at behind absorption tower, avoids equipment leakage from causing pollution.
(8) control of the discharge velocity of the absorbing liquid overfall on micropore absorption tower is used, is kept on micropore gas cutter
The reasonable liquid level in portion, reduce the internal circulating load of absorbing liquid.
(9) sealing and circulating mode of operation is used, it is process safety, reliable.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention；
Fig. 2 is micropore absorption tower of the present invention structural representation；
Fig. 3 is hook-type plate dehydrater structural representation in Fig. 2；
Fig. 4 is micropore gas cutter cut-away view in Fig. 2.
Marked in figure：1- micropores absorption tower；2- rich solution storage tanks；The rich poor absorption liquid heat exchangers of 3-；4- head tanks；5- scraper plates
Thin film evaporator；The poor liquid storage tanks of 6-；7- first-stage condensers；8-VOCs collecting tanks 1；9- secondary condensers；10-VOCs collecting tanks 2；
11- surge tanks；12- vavuum pumps；13- tower bodies；14- micropore gas cutters；15- air inlets；16- air outlets；17- feed tubes；
18- absorbing liquid overfalls；19- evacuation ports；20th, hook-type plate dehydrater；21st, liquid guide flow pipe；22nd, arc；23rd, hook-type plate；
24th, shape plate is rolled over；25th, fragmenting plate.
Embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings.
As Figure 1-4, VOCs recycling systems in a kind of waste gas, including micropore absorption tower 1, absorbing liquid cyclic system
System, liquid cooling system, rich poor absorption fluid circulation, condenser system, surge tank 11 and vavuum pump 12 are absorbed, by pipeline successively
Connection；The vavuum pump 12 is connected with the micropore absorption tower 1, forms closed circuit circulatory system.
The micropore absorption tower 1 includes tower body 13, micropore gas cutter 14, air inlet 15, air outlet 16, feed tube
17th, absorbing liquid overfall 18, evacuation port 19, the relatively described tower body 13 of the micropore gas cutter 14 are radially arranged；It is described enter
Air port 15 is arranged at the lower section of the micropore gas cutter 14, and the feed tube 17 is arranged at the micropore gas cutter 14
Top, at the micropore gas cutter 14, the side wall of the tower body 13 export absorbing liquid overfall 18.
Waste gas containing VOCs flows through micropore absorption tower 1 with 5-8m/s void tower wind speed, and through shape during micropore gas cutter 14
Into dispersed phase fluid, purified gas is discharged via air-introduced machine from chimney；The aperture of micropore gas cutter 14 is 0.3-
0.85mm, suitable pore size can be selected according to VOCs specific component.
The micropore gas cutter 14 has folding shape plate 24 and the grafting of fragmenting plate 25 to form, and air-flow is bent along folding shape plate 24
Passed between the aperture that passage gathers after passing through from fragmenting plate 25, two-stage absorption cleaning occurs in this process：The first order is cleaned
Journey is that absorbing liquid flows down from the aperture on fragmenting plate 25, and is fully contacted with the air-flow at upstream, carries out gas-liquid mass transfer process,
The rich absorbing liquid for absorbing exhaust emission composition is discharged by evacuation port 19；Second level purification process is that gas is close from fragmenting plate 25
After being passed between the aperture of cloth, a thin layer for passing through the top of micropore gas cutter 14 absorbs liquid level, the pollutant component in gas
Further it is purified processing.
Hook-type plate dehydrater 20 is provided with inside the tower body 13, above the micropore gas cutter 14, under it
Side is provided with liquid guide flow pipe 21, the waste gas after micro- unit of gas orifice cutter 14 fully absorbs purification, from the side of tower body 13
Be discharged into hook-type plate dehydrater 20, herein will likely existing big drop retention remove, then arranged again from the body another side of tower 13
Go out, finally discharged via air outlet 16.The drop being retained down returns to micropore absorption tower after collection, by liquid guide flow pipe 21.
The hook-type plate dehydrater 20 is made of corrosion resistant metal or organic material, and excessively stream speed is 3-7m/s；It is described
Hook-type plate dehydrater 20 is formed by arc 22 is longitudinal spliced, and distance is 50mm between the adjacent arc 22；The arc
Hook-type plate 23 is provided with 22, the concave surface of hook-type plate 23 and airflow direction are opposite；The hook-type plate 23 is arranged at the arc 22
Convex surface at.
Micropore absorption tower is a cylindrical column structure, and waste gas enters tower body 1 by air inlet, by micropore gas cutter 14
Mobile phase gas is cut into dispersed phase；And pass through micropore gas cutter 14；Absorbing liquid drains into micropore gas via feed tube 17
The top of body cutter 14, and the micropore of micropore gas cutter 14 is flowed through, by controlling the discharge opeing speed of absorbing liquid overfall 18,
The top of micropore gas cutter 14 forms a thin layer and absorbs liquid level；In the microcellular structure of micropore gas cutter 14, dispersed phase gives up
VOCs in gas is fully contacted and is dissolved in absorbing liquid with absorbing liquid；The waste gas for being fully absorbed VOCs compositions passes through micropore gas
The absorption liquid level on the top of body cutter 14, and discharged via air outlet 16；Absorbing liquid in tower body 1 can be put via evacuation port 19
It is empty.
The absorption fluid circulation includes rich solution storage tank 2 and elevator pump, and the absorbing liquid for absorbing VOCs components is referred to as richness
Liquid, and in the rich solution storage tank 2 stored；The rich solution storage tank 2 is by pipeline respectively at the feed tube on the micropore absorption tower 1
17th, absorbing liquid overfall 18 connects；The elevator pump is arranged at the pipeline of rich solution storage tank 2 and the feed tube 17 connection
On.
Absorbing liquid drains into the top of micropore gas cutter 14 on micropore absorption tower 1 via elevator pump, in waste gas with 5-8m/s
Wind speed when flowing through micropore gas cutter 14, form 1-8mm absorption liquid levels layer in micropore gas cutter 14.
The absorption liquid cooling system is coil heat exchange device, and logical brine ice cools to absorbing liquid, and control absorbs
Liquid temperature degree is 5-10 DEG C.
For the boiling point of absorbing liquid used at 200-300 DEG C, saturated vapor pressure is less than 0.1kPa (100 DEG C).And it can be directed to specific
VOCs compositions, using the strong absorbing liquid of selectivity, absorbed just for a certain or certain a kind of VOCs component.
The poor fluid circulation that absorbs of the richness includes rich poor absorption liquid heat exchanger 3, head tank 4, scrapper thin film evaporator
5th, poor liquid storage tank 6, the bottom richness absorbing liquid outlet of rich solution storage tank 2 are sequentially connected the poor absorbing liquid heat exchange of the richness by pipeline
Device 3, head tank 4 and scrapper thin film evaporator inlet 5, the liquid outlet of scrapper thin film evaporator 5 are sequentially connected by pipeline
The poor liquid storage tank 6, the rich poor poor absorbing liquid import for absorbing liquid heat exchanger 3 and the top of rich solution storage tank 2；Described in two groups
Pump is provided with pipeline, is circulated to absorbing liquid and power is provided；The desorption in the scrapper thin film evaporator 5 of rich absorbing liquid is completed
Afterwards, poor liquid storage tank 6 is first collected into, then pump after cooling operates, drains into micropore absorption to rich poor absorption liquid heat exchanger 3
In tower 1, absorption liquid desorption Posterior circle is used.
Rich absorbing liquid and poor absorbing liquid carry out heat exchange in rich poor absorption liquid heat exchanger 3, make to enter absorbing liquid storage
The temperature of the lean solution of tank lowers, while the rich solution temperature of absorption saturation is increased, and is advantageous to save the energy.
The operation temperature of the scrapper thin film evaporator 5 is realized by conduction oil, according to the VOCs boiling point situations absorbed, is led to
Cross conduction oil to heat scrapper thin film evaporator 5, general control temperature is at 60-150 DEG C；Aspirated by using vavuum pump 12
Effect, the vacuum of scrapper thin film evaporator 5 is controlled in 500-1500Pa.
The condenser system includes two groups of condensers 7,9, is connected by pipeline with the scrapper thin film evaporator 5, and
It is supporting to be provided with VOCs collecting tanks 8,10.
The VOCs compositions desorbed are introduced into first-stage condenser 7, carry out primary condensation recovery；Control vacuum exists
100-500Pa, low-temperature receiver used are running water, reclaim the VOCs to get off and drain into the first VOCs collecting tanks 8.Then two are entered back into
In level condenser 9, secondary condensation recovery is carried out；Control vacuum is brine ice in 10-100Pa, low-temperature receiver used, reclaims what is got off
VOCs is drained into the 2nd VOCs collecting tanks 10.
After condensed in two stages device 7,9, surge tank 11 is connected, keeps the vacuum of surge tank 11 to be less than 10Pa, the surge tank
11 can play a protective role to vavuum pump 12.
Contain a small amount of VOCs in the fixed gas that vavuum pump 12 is discharged, need to return to the air inlet 15 on micropore absorption tower 1, and via
Micropore absorption tower 1 is handled, and avoids secondary pollution.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement made within refreshing and principle etc., should be included in the scope of the protection.
Claims (6)
- A kind of 1. VOCs recycling systems in waste gas, it is characterised in that：Including micropore absorption tower, absorb fluid circulation, suction Liquid cooling system, rich poor absorption fluid circulation, condenser system, surge tank and vavuum pump are received, is sequentially connected by pipeline；It is described Tail gas of vacuum gas pump floss hole is connected with the micropore absorption tower, formed closed circuit circulatory system, the micropore absorption tower include tower body, Micropore gas cutter, air inlet, air outlet, feed tube, absorbing liquid overfall, evacuation port, the micropore gas cutter phase The tower body is radially arranged；The air inlet is arranged at the lower section of the micropore gas cutter, and the feed tube is arranged at The top of the micropore gas cutter, at the micropore gas cutter, tower body side wall export absorbing liquid overfall； Inside the tower body, hook-type plate dehydrater is provided with above the micropore gas cutter, liquid is provided with thereunder and leads Flow tube, the absorption fluid circulation include rich solution storage tank and elevator pump, the rich solution storage tank by pipeline respectively with it is described micro- The feed tube, the connection of absorbing liquid overfall on the absorption tower of hole；The elevator pump is arranged at the rich solution storage tank and the feed liquor On the pipeline of pipe connection, the poor fluid circulation that absorbs of the richness steams including rich poor absorption liquid heat exchanger, head tank, scraper plate film Device, poor liquid storage tank are sent out, the rich solution storage tank bottom richness absorbing liquid outlet is sequentially connected the poor absorbing liquid heat of the richness by pipeline and handed over Parallel operation, head tank and scrapper thin film evaporator inlet, the scrapper thin film evaporator liquid outlet are sequentially connected institute by pipeline State poor liquid storage tank, the rich poor poor absorbing liquid import for absorbing liquid heat exchanger and the rich solution storage tank top；The hook-type plate water removal Device is formed by arc is longitudinal spliced, hook-type plate is set on the arc, hook-type plate concave surface and airflow direction are opposite；Adjacent institute It is 20-100mm to state arc distance between plates；The micropore gas cutter is formed by folding shape plate and fragmenting plate grafting, air-flow edge folding Passed between the aperture that shape plate bent passage is gathered after passing through from fragmenting plate, two-stage absorption cleaning occurs in this process：The first order Purification process is that absorbing liquid flows down from the aperture on fragmenting plate, and is fully contacted with the air-flow at upstream, carries out gas-liquid mass transfer Process, the rich absorbing liquid for absorbing exhaust emission composition are discharged by evacuation port；Second level purification process is gas from fragmenting plate After being passed between densely covered aperture, a thin layer for passing through micropore gas cutter top absorbs liquid level, the pollutant component in gas Further it is purified processing；Rich absorbing liquid and poor absorbing liquid carry out heat exchange in the richness poor absorb liquid heat exchanger, The temperature for making to enter the lean solution for absorbing liquid storage tank lowers, while the rich solution temperature of absorption saturation is increased.
- 2. VOCs recycling systems in a kind of waste gas according to claim 1, it is characterised in that：The micropore gas is cut Cutter aperture is 0.3~0.85mm.
- 3. VOCs recycling systems in a kind of waste gas according to claim 2, it is characterised in that：Set at the air outlet Put air-introduced machine.
- 4. VOCs recycling systems in a kind of waste gas according to claim 1, it is characterised in that：The absorbing liquid cooling System is coil heat exchange device, and it is 5~10 DEG C to control absorbing liquid temperature.
- 5. VOCs recycling systems in a kind of waste gas according to claim 1, it is characterised in that：The condenser system bag Multigroup condenser is included, is connected by pipeline with the scrapper thin film evaporator.
- 6. VOCs recycling systems in a kind of waste gas according to claim 5, it is characterised in that：The condenser has two Group, and supporting it is provided with VOCs collecting tanks.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510082376.6A CN105289217B (en) | 2015-02-15 | 2015-02-15 | VOCs recycling systems in a kind of waste gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510082376.6A CN105289217B (en) | 2015-02-15 | 2015-02-15 | VOCs recycling systems in a kind of waste gas |
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| CN105797544B (en) * | 2016-04-19 | 2018-04-03 | 北京瑞惠环保科技有限公司 | One kind self-regulation film Two-way Cycle condensation charcoal absorption low-temperature catalytic oxidation combination unit |
| CN105771562B (en) * | 2016-04-22 | 2018-04-03 | 南京工业大学 | Volatile organic compound recovery processing system and method |
| CN107569973A (en) * | 2016-07-05 | 2018-01-12 | 北京化工大学苏州（相城）研究院 | The absorption processing method and system of VOC organic exhaust gas |
| CN106390737A (en) * | 2016-11-08 | 2017-02-15 | 中国科学院过程工程研究所 | Equipment for treating waste gas containing VOCs (volatile organic compounds) |
| CN106492605A (en) * | 2016-11-22 | 2017-03-15 | 徐亚军 | A kind of multi-stage combination, the Treatment process of circular treatment volatile organic compoundses |
| CN108889070A (en) * | 2018-07-19 | 2018-11-27 | 江苏安纳泰环保科技有限公司 | A kind of chemical emission adsorption tower |
| CN111036041B (en) * | 2019-11-14 | 2021-01-01 | 常州大学 | A VOCs recovery system and method integrating absorption, desorption and recovery |
| CN111514707A (en) * | 2020-06-10 | 2020-08-11 | 崔云兰 | VOCs volatile gas absorption system and absorption method |
| CN117619086B (en) * | 2023-12-02 | 2024-04-26 | 广州市帝东环保科技有限公司 | VOCs recovery device and recovery method thereof |
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Address after: 213000 No.18 Xinya Road, Wujin national high tech Industrial Development Zone, Changzhou City, Jiangsu Province Patentee after: Changzhou Daheng Purification Technology Co.,Ltd. Country or region after: China Address before: 213000 No.18 Xinya Road, Wujin national high tech Industrial Development Zone, Changzhou City, Jiangsu Province Patentee before: CHANGZHOU DAHENG ENVIRONMENTAL TECHNOLOGY Co.,Ltd. Country or region before: China |