CN109404957A - A kind of methanol gasifying device - Google Patents
A kind of methanol gasifying device Download PDFInfo
- Publication number
- CN109404957A CN109404957A CN201811507648.2A CN201811507648A CN109404957A CN 109404957 A CN109404957 A CN 109404957A CN 201811507648 A CN201811507648 A CN 201811507648A CN 109404957 A CN109404957 A CN 109404957A
- Authority
- CN
- China
- Prior art keywords
- methanol
- slot
- air
- air inlet
- efferent duct
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 title claims abstract description 501
- 239000004575 stone Substances 0.000 claims abstract description 18
- 229920000742 Cotton Polymers 0.000 claims abstract description 16
- 239000007788 liquid Substances 0.000 claims description 28
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 14
- 229910052802 copper Inorganic materials 0.000 claims description 14
- 239000010949 copper Substances 0.000 claims description 14
- 239000013589 supplement Substances 0.000 claims description 9
- 238000010992 reflux Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 abstract description 26
- 238000006555 catalytic reaction Methods 0.000 abstract description 21
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 abstract description 6
- 238000006243 chemical reaction Methods 0.000 abstract description 5
- 238000001704 evaporation Methods 0.000 abstract description 3
- 239000002341 toxic gas Substances 0.000 abstract description 3
- 230000008020 evaporation Effects 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 description 10
- 239000003054 catalyst Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000002309 gasification Methods 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K5/00—Feeding or distributing other fuel to combustion apparatus
- F23K5/02—Liquid fuel
- F23K5/14—Details thereof
- F23K5/22—Vaporising devices
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention discloses a kind of methanol gasifying devices, it is made of methanol gasifying slot, air supply part, methanol supply part and several mixed gas efferent ducts, it is provided with upper cover on methanol gasifying slot, several mixed gas efferent ducts and horizontal plane vertically laid out in parallel and are protruded into methanol gasifying slot by upper cover；Air supply part is made of two air inlet duct A, air inlet isocon and several air inlet ducts B；Methanol supply part enters pipe by methanol and methanol isocon forms；Methanol enters pipe and air inlet duct B is connect with methanol gasifying slot respectively；The present invention passes through the setting of air stone, cotton layer and air supply part, accelerate the evaporation rate of methanol, and guarantee that methanol can uniformly be mixed with the air of sufficient amount, so that catalysis reaction of the methanol in catalysis slot is more complete, efficiently reduce the generation of the toxic gases such as CO, formaldehyde.
Description
Technical field
The invention belongs to specifically design a kind of apply in heating system using methanol as the heating system technical field of fuel
Methanol gasifying device.
Background technique
Using methanol as the heating system of fuel, it is to utilize methanol and air under the effect of the catalyst, occurs aphlogistic
Catalyst combustion reaction simultaneously discharges heat, which can pass in the air around heating system to achieve the effect that heating, also
Thermal medium can be passed to achieve the effect that heating, the process is environmentally protective, and heating efficiency is high.
The factor for influencing catalysis ignition temperature is mainly the supply of catalyst type and ratio, methanol gas and air
Amount, when methanol gas or the supply amount deficiency of air, catalysis reaction not exclusively, is also easy to produce the toxic gases such as formaldehyde, CO；At present
Common be arranged is that methanol slot is arranged in the bottom of catalysis slot, and catalysis slot outer wall is equipped with air inlet, and the methanol in methanol slot is certainly
So enter catalysis slot after volatilization, and with the air that enters from air inlet, catalyst combustion reaction occurs under the effect of the catalyst；?
In the technical solution, the amount of vaporization of methanol is influenced by temperature larger, and the supply of air capacity is also unstable, and air need to be into
Enter in catalyst, then reacted with catalysis is carried out after methanol mixing, it is difficult to ensure that the uniform admixture of methanol and air, easily leads
Methanol oxidation is caused not exclusively to evaporate into the outside air of heating system；Meanwhile in the catalysis of methanol reaction, the stream of air
Speed is answered relatively slow, is reacted so that with it catalysis can occur for methanol completely, and in the technical program, the flow velocity of air equally can not
Control, and will appear methanol and react incomplete phenomenon.
Summary of the invention
In order to solve the above technical problems, the present invention provides a kind of methanol gasifying device, passes through air stone, cotton layer and air
The setting of supply part, accelerates the evaporation rate of methanol, and guarantees that methanol can uniformly be mixed with the air of sufficient amount, so that first
Catalysis reaction of the alcohol in catalysis slot is more complete, efficiently reduces the generation of the toxic gases such as CO, formaldehyde.
Technical solution provided by the invention is as follows:
A kind of methanol gasifying device, it is defeated by methanol gasifying slot, air supply part, methanol supply part and several mixed gas
Outlet pipe composition, is provided with upper cover on methanol gasifying slot, and vertically laid out in parallel is simultaneously for several mixed gas efferent ducts and horizontal plane
It is protruded into methanol gasifying slot by upper cover；Air supply part is by two air inlet duct A, air inlet isocon and several air
Input pipe B composition, air inlet duct A are separately positioned on two ends of air inlet isocon, the air input of several arranged in parallel
The one end pipe B is connect with the side of air inlet isocon, and the other end is protruded into methanol gasifying slot by upper cover, is set on air inlet duct A
There is reflux valve；Methanol supply part enters pipe by methanol and methanol isocon forms, and methanol isocon is equipped with methanol inlet port
Supplement/outflux is supplemented with methanol, one end that methanol enters pipe is connect with methanol isocon, and the other end is by methanol gasifying slot
It is communicated inside downside and methanol gasifying slot.
Preferably, it is additionally provided with methanol liquid level on methanol isocon and shows that lower nozzle, upper lid are equipped with methanol liquid level and show
Nozzle, methanol liquid level show that lower nozzle shows that upper orifice is connected by transparent liquid level charactron with methanol liquid level.
It is highly preferred that liquid level charactron is arranged at " ∩ " shape.
Preferably, in several air inlet ducts B, the bottom of the air inlet duct B of 2/3 quantity is connected with bubble
Stone, air stone are located at the bottom position of methanol gasifying slot.
It is highly preferred that being filled with cotton layer in methanol gasifying slot, the bottom of cotton layer is contacted with air stone, top and upper cover
There are the gaps of 2 ~ 5mm, not connected to have the bottom of the air inlet duct B of air stone to be placed in the gap.
Preferably, air inlet duct A is connect with air inlet isocon by triple valve, and another interface of triple valve passes through copper pipe
I connect with outlet isocon, further includes copper pipe II identical with mixed gas efferent duct quantity, one end and air inlet isocon
Side connection, the other end are connect with the side of mixed gas efferent duct.
Preferably, mixed gas efferent duct is made of efferent duct A and efferent duct B, and the diameter of efferent duct A is efferent duct B's
2.5 ~ 3 times of diameter, efferent duct B is located at the top of efferent duct A.
Preferably, the length of efferent duct B is greater than the length of efferent duct A；Efferent duct B is made by copper.
Preferably, the length of mixed gas efferent duct is 5 ~ 8 times of the length of air inlet duct B.
Compared with prior art, the present invention has following technical advantage:
(1) after the air in the present invention enters methanol gasifying slot, it is divided into two-way, wherein air all the way is transported to methanol gasifying
Air molecule is segmented by air stone and is exported to methanol trench bottom by trench bottom, and the air after being subdivided can be from methanol gasifying
Trench bottom evaporates into top, and in this process, methanol and air adsorption are combined into mixed gas, and from the bottom of methanol gasifying slot
Top is evaporated into, the gasification of methanol is thereby accelerated；The air of another way is transported to above the cotton layer in methanol gasifying slot,
It is mixed with the methanol evaporated into above cotton layer, to guarantee to can avoid in mixed gas containing amount of oxygen needed for catalysis reaction
Methanol causes catalysis to react incomplete phenomenon generation because determining；
(2) cotton fiber in the present invention has stronger moisture absorption and permeability, the mixed methanol of methanol gasifying trench bottom
With air in uphill process, resistance and fine and closely woven space by cotton fiber layer by layer increase the mixed of methanol and air
Conjunction degree；Meanwhile the absorption by cotton layer to methanol, it can effectively prevent methanol gasifying slot after collapsing the phenomenon that methanol outflow
Occur；
(3) diameter of the diameter of the efferent duct B in the present invention less than efferent duct A easily condenses once again because methanol is in gasification
At methanol liquid, after methanol liquid condenses in efferent duct A, it is not easily accessible in efferent duct B, flows back into methanol gasifying down mostly
In slot；Even if there is only a few methanol liquid to enter in efferent duct B, because the length of efferent duct B is much larger than the length of efferent duct A, and
Efferent duct B is placed perpendicular to horizontal plane, and the ascending path of methanol liquid is longer, the effect in uphill process, vulnerable to its gravity
And decline, and be back in methanol gasifying slot；In addition, efferent duct B is made by copper, copper has excellent heating conduction, can help
Methanol in pipeline fully absorbs extraneous heat and guarantees that it is in the state of gasification, effectively prevent liquid methanol to enter and urges
Change in slot, and influences the catalytic activity of catalyst.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention
Fig. 2 is structural schematic diagram of the invention
Fig. 3 is structural schematic diagram of the invention
Fig. 4 is the structural schematic diagram of the mixed gas efferent duct in the present invention
Fig. 5 is the structural schematic diagram of the methanol gasifying slot in the present invention
Fig. 6 is the structural schematic diagram of the triple valve in the present invention
Wherein: 1, methanol gasifying slot 2, upper cover 3, air inlet duct A 4, air inlet isocon 5, air inlet duct B 6, adverse current
Valve 7, triple valve 8, valve switch 9, air stone 10, cotton layer 11, methanol enter pipe 12, methanol isocon 13, methanol
Inlet port 14, methanol supplement supplement/outflux 15, methanol liquid level show lower nozzle 16, copper pipe II 17, liquid level charactron
18, efferent duct A 19, efferent duct B 20, copper pipe I 21, outlet isocon.
Specific embodiment
Now in conjunction with the drawings and specific embodiments, the present invention is described further.
As shown in Figure 1 to Figure 3, the invention discloses a kind of methanol gasifying devices, by methanol gasifying slot 1, air supply unit
Part, methanol supply part and four mixed gas efferent ducts composition, are provided with upper cover 2 on methanol gasifying slot 1, methanol gasifying slot with
Metal-to-metal adhesive is coated between upper cover, to prevent the spilling of methanol；Four mixed gas efferent ducts and horizontal plane vertically laid out in parallel,
And it is protruded into methanol gasifying slot 1 by upper cover 2；Air supply part is by two air inlet duct A3, air inlet isocon 4 and six
Air inlet duct B5 composition, the length of mixed gas efferent duct are 4 ~ 8 times of the length of air inlet duct B5, air inlet duct A3
It is separately positioned on two ends of air inlet isocon 4 by triple valve 7, one end air inlet duct B5 of six arranged in parallel and air inlet
The side of isocon 4 connects, and the other end is protruded into methanol gasifying slot 1 by upper cover 2, wherein the bottom of four air inlet duct B5
Portion is connected with air stone 9, and air stone 9 is located at the bottom position of methanol gasifying slot 1.
Cotton layer 10 is filled in methanol gasifying slot 1, the bottom of cotton layer 10 is contacted with air stone 9, and top is stayed with upper cover 2
There is a gap of 2 ~ 5mm, two root bottom parts are to be connected with the air inlet duct B5 of air stone 9 to be placed in the gap.
Methanol supply part enters pipe 11 by methanol and methanol isocon 12 forms, methanol isocon 12 be equipped with methanol into
Entrance 13, methanol liquid level show that lower nozzle 15 and methanol supplement supplement/outflux 14(are as shown in Figure 5), methanol enters pipe 11
One end is connect with methanol isocon 12, the other end by methanol gasifying slot 1 downside and the 1 of methanol gasifying slot inside communicate,
Upper cover 2 is equipped with methanol liquid level and shows upper orifice (not marking in figure), and methanol liquid level shows that lower nozzle 15 and methanol liquid level are shown
Upper orifice is connected by transparent liquid level charactron 17, and liquid level charactron 17 is arranged at " ∩ " shape.
In the present invention, as shown in figure 5, mixed gas efferent duct is made of efferent duct A18 and efferent duct B19, efferent duct
The diameter of B19 is preferably 10 ~ 15mm, and the diameter of efferent duct A18 is preferably 25 ~ 40mm, and efferent duct B19 is located at efferent duct A18's
Top；The length of efferent duct B19 is preferably 500 ~ 800mm, and the length of efferent duct A18 is preferably 100mm；Efferent duct A18 is by copper
It is made.
In the present invention, the third interface of triple valve 7 is connected with outlet isocon 21, outlet isocon by copper pipe I 20
21 side connects side by side there are four copper pipe II 16, and another end of copper pipe II 16 is connect with the side of efferent duct A18.
In actual use, two air pumps are connect with two air inlet duct A3 respectively, methanol inlet port 13
It being connect with methanol pump, methanol pump is connect with methanol reserve tank, and valve switch 8 is allocated to location A (as shown in Figure 6), opening air pump,
Switch (not marked in figure) between methanol pump and mixed gas efferent duct and catalysis slot, and the flow rate set of setting air pump
For 35 ~ 100ml/min, methanol enters methanol gasifying slot 1, and cotton layer 10 adsorbs, and observes the methanol liquid level in liquid level charactron 17
Methanol pump when reaching sets requirement, is closed in display position；The air that air pump is got, by reflux valve 6, triple valve 7 and into
Gas isocon 4 enters methanol gasifying slot 1, wherein air and methanol that four air inlet duct B5 equipped with air stone 9 come out are inhaled
It is attached, by cotton layer 10,1 top of methanol gasifying slot is evaporated into, mixed gas after mixing passes through mixed gas efferent duct
Afterwards, into catalyst combustion reaction occurs in catalysis slot, in addition, the sky that two air inlet duct B5 for being not charged with air stone 9 come out
Gas is mixed with the methanol for evaporating into 1 top of methanol gasifying slot, after mixed gas efferent duct, is urged into being catalyzed in slot
Change combustion reaction.
After heating system stops working, catalysis slot at this time need to have the process of a cooling, close methanol pump, and by valve
Door switch 8 is allocated to B location, the air got from air pump, without methanol gasifying slot 1, is directly over outlet isocon 21
With mixed gas efferent duct, into catalysis slot, to guarantee that remaining methanol has sufficient oxygen supply amount；In the process, meeting
Methanol after having extremely micro gasification enters in catalysis slot through mixed gas efferent duct, but the cooling to catalysis slot, has no shadow
It rings, when the temperature being catalyzed in slot is down in a certain range, air pump and air inlet duct A is disconnected, and close mixed gas
Switch between efferent duct and catalysis slot can terminate the work of methanol gasifying device.
In addition, in the present invention, supplement/outflux 14 can also be supplemented by methanol, supplement first into methanol gasifying slot 1
Alcohol liquid, or methanol liquid is sucked out from methanol gasifying slot 1.
Claims (9)
1. a kind of methanol gasifying device, it is characterised in that: if by methanol gasifying slot, air supply part, methanol supply part and
Dry mixed gas efferent duct forms, and is provided with upper cover on methanol gasifying slot, several mixed gas efferent ducts and horizontal plane are perpendicular
Straight ground laid out in parallel is simultaneously protruded into methanol gasifying slot by upper cover；Air supply part is shunted by two air inlet duct A, air inlet
Pipe and several air inlet ducts B composition, air inlet duct A are separately positioned on two ends of air inlet isocon, and and air pump
Connection, one end air inlet duct B of several arranged in parallel are connect with the side of air inlet isocon, and the other end is protruded by upper cover
In methanol gasifying slot, air inlet duct A is equipped with reflux valve；Methanol supply part enters pipe and methanol isocon group by methanol
At methanol isocon is equipped with methanol inlet port and methanol supplements supplement/outflux, and methanol enters one end of pipe and methanol shunts
Pipe connection, the other end inside the downside of methanol gasifying slot and methanol gasifying slot by communicating.
2. a kind of methanol gasifying device according to claim 1, it is characterised in that: be additionally provided with methanol solution on methanol isocon
Position display lower nozzle, upper lid are equipped with methanol liquid level and show upper orifice, and methanol liquid level shows that lower nozzle and methanol liquid level are shown
Nozzle is connected by transparent liquid level charactron.
3. a kind of methanol gasifying device according to claim 2, it is characterised in that: liquid level charactron is arranged at " ∩ " shape.
4. a kind of methanol gasifying device according to claim 1, it is characterised in that: in several air inlet ducts B, have
The bottom of the air inlet duct B of 2/3 quantity is connected with air stone, and air stone is located at the bottom position of methanol gasifying slot.
5. a kind of methanol gasifying device according to claim 4, it is characterised in that: be filled with cotton in methanol gasifying slot
Layer, the bottom of cotton layer are contacted with air stone, and there are the gaps of 2 ~ 5mm for top and upper cover, not connected to have the air of air stone defeated
The bottom for entering pipe B is placed in the gap.
6. a kind of methanol gasifying device according to claim 1, it is characterised in that: air inlet duct A and air inlet isocon
It is connected by triple valve, another interface of triple valve is connect by copper pipe I with outlet isocon, further includes exporting with mixed gas
The identical copper pipe II of pipe quantity, one end are connect with the side of outlet isocon, the side of the other end and mixed gas efferent duct
Connection.
7. a kind of methanol gasifying device according to claim 1, it is characterised in that: mixed gas efferent duct is by efferent duct A
It is formed with efferent duct B, the diameter of efferent duct A is 2.5 ~ 3 times of the diameter of efferent duct B, and efferent duct B is located at the top of efferent duct A.
8. a kind of methanol gasifying device according to claim 7, it is characterised in that: the length of efferent duct B is greater than efferent duct A
Length；Efferent duct B is made by copper.
9. a kind of methanol gasifying device according to claim 1, it is characterised in that: the length of mixed gas efferent duct is sky
5 ~ 8 times of the length of gas input pipe B.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811507648.2A CN109404957A (en) | 2018-12-11 | 2018-12-11 | A kind of methanol gasifying device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811507648.2A CN109404957A (en) | 2018-12-11 | 2018-12-11 | A kind of methanol gasifying device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109404957A true CN109404957A (en) | 2019-03-01 |
Family
ID=65458268
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811507648.2A Pending CN109404957A (en) | 2018-12-11 | 2018-12-11 | A kind of methanol gasifying device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109404957A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI233971B (en) * | 2004-01-04 | 2005-06-11 | Teng-Mao Chiu | Gas mixing device |
| JP2008097985A (en) * | 2006-10-11 | 2008-04-24 | Kurita Water Ind Ltd | Direct methanol type fuel battery system and portable electronic equipment using this |
| CN106090903A (en) * | 2016-06-22 | 2016-11-09 | 杭州左纳实业有限公司 | Methanol or light-hydrocarbon fuel combustor |
| CN207471570U (en) * | 2017-10-23 | 2018-06-08 | 河南师范大学 | A kind of ultrasonic wave methanol combustion furnace |
| CN209213907U (en) * | 2018-12-11 | 2019-08-06 | 约伯(宁夏)环保节能科技发展有限公司 | A kind of methanol gasifying device |
-
2018
- 2018-12-11 CN CN201811507648.2A patent/CN109404957A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI233971B (en) * | 2004-01-04 | 2005-06-11 | Teng-Mao Chiu | Gas mixing device |
| JP2008097985A (en) * | 2006-10-11 | 2008-04-24 | Kurita Water Ind Ltd | Direct methanol type fuel battery system and portable electronic equipment using this |
| CN106090903A (en) * | 2016-06-22 | 2016-11-09 | 杭州左纳实业有限公司 | Methanol or light-hydrocarbon fuel combustor |
| CN207471570U (en) * | 2017-10-23 | 2018-06-08 | 河南师范大学 | A kind of ultrasonic wave methanol combustion furnace |
| CN209213907U (en) * | 2018-12-11 | 2019-08-06 | 约伯(宁夏)环保节能科技发展有限公司 | A kind of methanol gasifying device |
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Effective date of registration: 20240814 Address after: Unit 304, Building 1-4, Qishanyuan, Shangjie Town, Minhou County, Fuzhou City, Fujian Province, 350000 Applicant after: Chen Yubing Country or region after: China Address before: Room 2521, Building 4-3, Forest Peninsula, Jinfeng District, Yinchuan City, Ningxia Hui Autonomous Region, 750000 Applicant before: YUEBO (NINGXIA) ENVIRONMENTAL PROTECTION AND ENERGY SAVING TECHNOLOGY DEVELOPMENT Co.,Ltd. Country or region before: China |