CN204141916U - A kind of cold energy of liquefied natural gas recovery system - Google Patents
A kind of cold energy of liquefied natural gas recovery system Download PDFInfo
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- CN204141916U CN204141916U CN201420587565.XU CN201420587565U CN204141916U CN 204141916 U CN204141916 U CN 204141916U CN 201420587565 U CN201420587565 U CN 201420587565U CN 204141916 U CN204141916 U CN 204141916U
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- temperature sensor
- valve
- holding vessel
- heat exchanger
- natural gas
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- 239000003949 liquefied natural gas Substances 0.000 title claims abstract description 42
- 238000005380 natural gas recovery Methods 0.000 title claims abstract description 14
- 239000007789 gas Substances 0.000 claims abstract description 9
- 239000003507 refrigerant Substances 0.000 claims description 51
- 239000007788 liquid Substances 0.000 claims description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- VOPWNXZWBYDODV-UHFFFAOYSA-N Chlorodifluoromethane Chemical group FC(F)Cl VOPWNXZWBYDODV-UHFFFAOYSA-N 0.000 claims description 18
- 239000002826 coolant Substances 0.000 claims description 7
- 238000005219 brazing Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 5
- 238000011084 recovery Methods 0.000 abstract description 3
- 238000004642 transportation engineering Methods 0.000 abstract description 2
- 230000004087 circulation Effects 0.000 description 7
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 238000001816 cooling Methods 0.000 description 3
- 238000002309 gasification Methods 0.000 description 3
- 239000003345 natural gas Substances 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 230000009967 tasteless effect Effects 0.000 description 1
- 239000006200 vaporizer Substances 0.000 description 1
Abstract
The utility model relates to oil-gas storage and Transportation Engineering technical field, is a kind of cold energy of liquefied natural gas recovery system concretely.The utility model compared with prior art; achieve the recovery of cold energy in liquefied natural gas gasifying process; save mass energy; really reach energy-saving and emission-reduction, increase economic efficiency, the object of protection of the environment; employ a large amount of control valves and sensor simultaneously, whole system device can be safely and steadily run.
Description
Technical field
The utility model relates to oil-gas storage and Transportation Engineering technical field, is a kind of cold energy of liquefied natural gas recovery system concretely.
Technical background
Along with the development of society, liquefied natural gas proportion in current energy use amount as one of world's main energy sources improves year by year, along with wideling popularize of China town dweller and industrial enterprise's natural gas, and the reinforcement of atmosphere pollution improvement degree, supplementing as pipeline gas, liquefied natural gas have also been obtained to be applied widely.
Natural gas gasifying station is a kind of small-sized reception and gasification station, can be used as among a small circle or the air feed facility of unique user, usually by LNG cold holding vessel, barometer, pry regulator, measuring equipment, add smelly equipment etc. and form.The liquefied natural gas be stored in liquefied natural gas becomes gaseous state by vaporizer absorbing environmental heat from liquid state, sends into gas distributing system and use after adding smelly, pressure regulation, metering.Liquefied natural gas is because absorbing environmental heat can produce a large amount of cold energy in gasification, and these cold energy are directly taken away by air usually, causes a large amount of wastes of cold energy.
Design for this reason one can safely, stable, reasonably recycle cold energy of liquefied natural gas, and reach the saving energy, energy-saving and emission-reduction, increase economic efficiency, the cold energy of liquefied natural gas recovery system of protection of the environment object.
Summary of the invention
The utility model breaches the difficulty of prior art; devise one can safely, stable, reasonably recycle natural gas cold energy, and reach save the energy, energy-saving and emission-reduction, increase economic efficiency, the cold energy of liquefied natural gas recovery system of protection of the environment object.
For achieving the above object, the utility model devises a kind of cold energy of liquefied natural gas recovery system, comprise: liquefied natural gas storage tanks, heat exchanger, refrigerant holding vessel, frozen water holding vessel, stop valve, atmospheric valve, temperature sensor and pressure sensor, it is characterized in that: the liquid lng delivery outlet of liquefied natural gas storage tanks is connected with one end of stop valve one, the other end of stop valve divides 2 tunnels to be connected with one end of magnetic valve two with one end of magnetic valve one respectively, the other end of magnetic valve two is connected with the upper end of heat exchanger one side, the other end of magnetic valve one is divided into 2 tunnels to be connected with atmospheric valve one with one end of stop valve two respectively, the other end of stop valve two is connected with the gaseous liquefied gas input port of liquefied natural gas storage tanks, atmospheric valve one be divided into 3 tunnels respectively with one end of pressure sensor one, one end of temperature sensor one, the lower end of heat exchanger one side is connected, the other end of pressure sensor one is connected with one end of temperature sensor two, the other end of temperature sensor one is connected with one end of temperature sensor two, the other end of temperature sensor two is connected with the middle-end of magnetic valve one, the opposite side of heat exchanger one divides two-way to be connected with the liquid refrigerants input port of refrigerant holding vessel with temperature sensor three respectively, temperature sensor three be divided into again 4 tunnels respectively with one end of pressure sensor two, one end of pressure sensor three, one end of pressure sensor four, the gaseous coolant delivery outlet of refrigerant holding vessel is connected, the other end of pressure sensor two is connected with the middle-end of magnetic valve two, the other end of pressure sensor three is connected with the upper end of refrigerant holding vessel, the upper end of refrigerant holding vessel is connected with atmospheric valve two, the side of refrigerant holding vessel is connected with one end of temperature sensor four, the other end of temperature sensor four is connected with one end of pressure sensor two, the opposite side of refrigerant holding vessel is connected with visor one, position below visor one is provided with the magnetic flap level gauge be connected with refrigerant holding vessel, magnetic flap level gauge is divided into 2 tunnels to be connected with one end of temperature sensor five and one end of temperature sensor six respectively, the other end of temperature sensor five is connected with the middle-end of electric control valve one, one end of electric control valve one is connected with one end of stop valve three, the other end of stop valve three is connected with the liquid refrigerants delivery outlet of refrigerant holding vessel, the other end of electric control valve one is connected with the lower end of heat exchanger two side, the upper end of heat exchanger two side is divided into 2 tunnels to be connected with the gaseous coolant input port of refrigerant holding vessel with visor two respectively, the other end of temperature sensor six is divided into 2 tunnels, be connected with one end of pump with one end of stop valve four respectively, the other end of stop valve is connected with the lower end of heat exchanger two opposite side, the other end of pump is connected with the delivery port of frozen water holding vessel, the upper end of heat exchanger two the same side is connected with one end of electric control valve two, the middle-end of electric control valve two is connected with the other end of pressure regulator four, the other end of electric control valve two is connected with the water inlet of frozen water holding vessel.
Described refrigerant is monochlorodifluoromethane.
Described heat exchanger is brazing plate type heat exchanger.
In described heat exchanger one, the port of connected electromagnetic valve two is connected with the port being connected temperature sensor one, and the port connecting temperature sensor three is connected with the port being connected liquid refrigerants input port.
The port connecting electric control valve two in described heat exchanger two is connected with the port being connected stop valve four, and the port connecting visor two is connected with the port being connected electric control valve one.
The utility model compared with prior art; achieve the recovery of cold energy in liquefied natural gas gasifying process; save mass energy; really reach energy-saving and emission-reduction, increase economic efficiency, the object of protection of the environment; employ a large amount of control valves and sensor simultaneously, whole system device can be safely and steadily run.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Detailed description of the invention
By reference to the accompanying drawings the utility model is further described.
See Fig. 1, the utility model devises a kind of cold energy of liquefied natural gas recovery system, comprise: liquefied natural gas storage tanks 1, heat exchanger, refrigerant holding vessel 2, frozen water holding vessel 3, stop valve, atmospheric valve, temperature sensor and pressure sensor, the liquid lng delivery outlet of liquefied natural gas storage tanks 1 is connected with one end of stop valve 1, the other end of stop valve 1 divides 2 tunnels to be connected with one end of magnetic valve 26 with one end of magnetic valve 1 respectively, the other end of magnetic valve 26 is connected with the upper end of heat exchanger 1 side, the other end of magnetic valve 1 is divided into 2 tunnels to be connected with atmospheric valve 1 with one end of stop valve 28 respectively, the other end of stop valve 28 is connected with the gaseous liquefied gas input port of liquefied natural gas storage tanks 1, atmospheric valve 1 be divided into 3 tunnels respectively with one end of pressure sensor 1, one end of temperature sensor 1, the lower end of heat exchanger 1 side is connected, the other end of pressure sensor 1 is connected with one end of temperature sensor 2 12, the other end of temperature sensor 1 is connected with one end of temperature sensor 2 12, the other end of temperature sensor 2 12 is connected with the middle-end of magnetic valve 1, the opposite side of heat exchanger 1 divides 2 tunnels to be connected with the liquid refrigerants input port of refrigerant holding vessel 2 with temperature sensor 3 13 respectively, temperature sensor 3 13 be divided into again 4 tunnels respectively with one end of pressure sensor 2 14, one end of pressure sensor 3 15, one end of pressure sensor 4 16, the gaseous coolant delivery outlet of refrigerant holding vessel 2 is connected, the other end of pressure sensor 2 14 is connected with the middle-end of magnetic valve 26, the other end of pressure sensor 3 15 is connected with the upper end of refrigerant holding vessel 2, the upper end of refrigerant holding vessel 2 is connected with atmospheric valve 2 17, the side of refrigerant holding vessel 2 is connected with one end of temperature sensor 4 29, the other end of temperature sensor 4 29 is connected with one end of pressure sensor 2 14, the opposite side of refrigerant holding vessel 2 is connected with visor 1, position below visor 1 is provided with the magnetic flap level gauge 19 be connected with refrigerant holding vessel 2, magnetic flap level gauge 19 is divided into 2 tunnels to be connected with one end of temperature sensor 5 20 and one end of temperature sensor 6 21 respectively, the other end of temperature sensor 5 20 is connected with the middle-end of electric control valve 1, one end of electric control valve 1 is connected with one end of stop valve 3 23, the other end of stop valve 3 23 is connected with the liquid refrigerants delivery outlet of refrigerant holding vessel 2, the other end of electric control valve 1 is connected with the lower end of heat exchanger 2 24 side, the upper end of heat exchanger 2 24 side is divided into 2 tunnels to be connected with the gaseous coolant input port of refrigerant holding vessel 2 with visor 2 25 respectively, the other end of temperature sensor 6 21 is divided into 2 tunnels, be connected with one end of pump 27 with one end of stop valve 4 26 respectively, the other end of stop valve 4 26 is connected with the lower end of heat exchanger 2 24 opposite side, the other end of pump 27 is connected with the delivery port of frozen water holding vessel 3, the upper end of heat exchanger 2 24 the same side is connected with one end of electric control valve 2 28, the middle-end of electric control valve 2 28 is connected with the other end of pressure regulator 4 16, the other end of electric control valve 2 28 is connected with the water inlet of frozen water holding vessel 3.
In the utility model, refrigerant is monochlorodifluoromethane, is R22, is a kind of cold-producing medium, is colourless at normal temperatures, and approximate tasteless gas, does not burn, do not explode, corrosion-free, and pressurization liquefiable is water white liquid.Its chemical stability and heat endurance are all very high, the minimum cryogenic temperature obtaining-80 DEG C.
In the utility model, heat exchanger is brazing plate type heat exchanger, is made up of one group of wavy metal plate, plate has four holes, and two kinds of liquid for heat exchange pass through.Metal sheet is arranged in a framework having fixed head and movable pressure plate, and clamps with fishbolt.Plate is equipped with gasket seal, fluid passage is sealed, and guide in fluid to respective passage.Corrugated plating not only increases turbulent extent, and forms many strong points, is enough to the pressure differential of bearing between medium.Metallic plate and movable pressure plate are suspended on top guide bar, and are located by lower guide rod, and rod end is then fixed on the support columns.
In the utility model, in heat exchanger 1, the port of connected electromagnetic valve 26 is connected with the port being connected temperature sensor 1, and the port connecting temperature sensor 3 13 is connected with the port being connected liquid refrigerants input port.
The port connecting electric control valve 2 28 in the utility model in heat exchanger 2 24 is connected with the port being connected stop valve 4 26, and the port connecting visor 2 25 is connected with the port being connected electric control valve 1.
Detailed description of the invention is as follows:
In cold energy of liquefied natural gas recovery system, main technological process is as follows:
Circulation 1: liquid liquefied natural gas is flowed out by the delivery outlet of liquefied natural gas storage tanks 1, through stop valve 1 and electric control valve 26, inflow heat exchanger 1, in heat exchanger 1, endothermic gasification becomes gaseous state from liquid state, through temperature sensor 1, pressure sensor 1, atmospheric valve 1 with stop valve 28 is laggard becomes owner of steam line, for user after adding smelly, pressure regulation, metering;
Circulation 2: gaseous state monochlorodifluoromethane by refrigerant holding vessel 2 gaseous coolant delivery outlet out, heat exchanger 1 is entered after temperature sensor 3 13, carry out heat exchange monochlorodifluoromethane with the liquid liquefied natural gas of circulation 1 and absorb the cold that liquefied natural gas discharges, by gaseous state liquefy, after enter in refrigerant holding vessel 2;
Circulation 3: liquid monochlorodifluoromethane is flowed out by the liquid refrigerants delivery outlet of refrigerant holding vessel 2, inflow heat exchanger 2 24 after stop valve 3 23 and electric control valve 1, with water heat exchange, monochlorodifluoromethane released cold quantity, become gaseous state by liquid state, after get back in refrigerant holding vessel 2;
Circulation 4: cold water is flowed out by the delivery port of frozen water holding vessel 3, through pump 27, temperature sensor 6 21 and stop valve 4 26, inflow heat exchanger 2 24, heat exchange is carried out with the monochlorodifluoromethane of circulation 3, water absorbs the cold of monochlorodifluoromethane release, reach the object of cooling, get back to frozen water holding vessel 3 by electric control valve 2 28.
Except four circulations of above main technique, also according to the requirement such as security of system, stable operation, devise complete control system:
1) when temperature sensor 4 29 detects that temperature detects pressure lower than 3bar lower than 0 DEG C or pressure sensor 3 15, show that in refrigerant holding vessel 2, liquid monochlorodifluoromethane is too much, illustrative system now end refrigeration duty reduces, " supply exceed demand ".Now, shut electromagnetic valve 26, opens magnetic valve 1, and magnetic valve 26 is opened when normal operation, and magnetic valve 1 cuts out, and liquefied natural gas to be entered after empty temperature gasifier gasifies through stop valve 1, magnetic valve 1 and stop valve 28 by bypass and enters gas pipeline.In addition, when heat exchanger 1 breaks down or blocks, pressure sensor 1 is shown as abnormal with temperature sensor 1 parameter, when causing heat transfer effect reduction or not heat exchange, shut electromagnetic valve 26, open magnetic valve 1, liquefied natural gas is circulated by bypass;
2) when pressure sensor 3 15 detects pressure lower than 5bar, electric control valve 2 28 standard-sized sheet; When pressure sensor 3 15 detects pressure higher than 8bar, electric control valve 2 28 reduces aperture; When pressure sensor 3 15 detects pressure higher than 10bar, electric control valve 2 28 aperture is reduced to 30%.During lower than 5bar, show that in refrigerant holding vessel 2, liquid monochlorodifluoromethane is too much, at this moment should accelerate with speed of cooling, i.e. electric control valve 2 28 standard-sized sheet, accelerate water side and get cold speed, make monochlorodifluoromethane liquid level be in reasonable level.During higher than 8bar, show that in refrigerant holding vessel 2, gaseous state monochlorodifluoromethane is too much, at this moment should reduce by speed of cooling, namely reduce the aperture of electric control valve 2 28, reduce water side and get cold speed, make monochlorodifluoromethane liquid level be in reasonable level.During higher than 10bar, reduce water side further and get cold speed, the aperture of electric control valve 2 28 is down to about 30%;
3) enter the monochlorodifluoromethane flow of heat exchanger 2 24 and refrigerant holding vessel 2 liquid level and frozen water holding vessel 3 cold water temperature out and temperature sensor 6 21 chain: when magnetic flap level gauge 19 record liquid level too low time, show that liquid monochlorodifluoromethane is very few, i.e. " supply-less-than-demand ", the aperture of electric control valve 1 is now reduced; When magnetic flap level gauge 19 record liquid level too high time, show that liquid monochlorodifluoromethane is too much, i.e. " supply exceed demand ", now strengthen the aperture of electric control valve 1; When temperature sensor 6 21 detects that temperature is too low, show to reduce by cold side demand, i.e. " supply exceed demand ", now reduce the aperture of electric control valve 1; When temperature sensor 6 21 detects that temperature is too high, show to increase by cold side demand, i.e. " supply-less-than-demand ", now strengthen the aperture of electric control valve 1.
The utility model compared with prior art; achieve the recovery of cold energy in liquefied natural gas gasifying process; save mass energy; really reach energy-saving and emission-reduction, increase economic efficiency, the object of protection of the environment; employ a large amount of control valves and sensor simultaneously, whole system device can be safely and steadily run.
Claims (5)
1. a cold energy of liquefied natural gas recovery system, comprise: liquefied natural gas storage tanks, heat exchanger, refrigerant holding vessel, frozen water holding vessel, stop valve, atmospheric valve, temperature sensor and pressure sensor, it is characterized in that: the liquid lng delivery outlet of liquefied natural gas storage tanks (1) is connected with one end of stop valve one (4), the other end of stop valve one (4) divides 2 tunnels to be connected with one end of magnetic valve two (6) with one end of magnetic valve one (5) respectively, the other end of magnetic valve two (6) is connected with the upper end of heat exchanger one (7) side, the other end of magnetic valve one (5) is divided into 2 tunnels to be connected with atmospheric valve one (9) with one end of stop valve two (8) respectively, the other end of stop valve two (8) is connected with the gaseous liquefied gas input port of liquefied natural gas storage tanks (1), atmospheric valve one (9) be divided into 3 tunnels respectively with one end of pressure sensor one (10), one end of temperature sensor one (11), the lower end of heat exchanger one (7) side is connected, the other end of pressure sensor one (10) is connected with one end of temperature sensor two (12), the other end of temperature sensor one (11) is connected with one end of temperature sensor two (12), the other end of temperature sensor two (12) is connected with the middle-end of magnetic valve one (5), the opposite side of heat exchanger one (7) divides 2 tunnels to be connected with the liquid refrigerants input port of temperature sensor three (13) with refrigerant holding vessel (2) respectively, temperature sensor three (13) be divided into again 4 tunnels respectively with one end of pressure sensor two (14), one end of pressure sensor three (15), one end of pressure sensor four (16), the gaseous coolant delivery outlet of refrigerant holding vessel (2) is connected, the other end of pressure sensor two (14) is connected with the middle-end of magnetic valve two (6), the other end of pressure sensor three (15) is connected with the upper end of refrigerant holding vessel (2), the upper end of refrigerant holding vessel (2) is connected with atmospheric valve two (17), the side of refrigerant holding vessel (2) is connected with one end of temperature sensor four (29), the other end of temperature sensor four (29) is connected with one end of pressure sensor two (14), the opposite side of refrigerant holding vessel (2) is connected with visor one (18), the position of visor one (18) below is provided with the magnetic flap level gauge (19) be connected with refrigerant holding vessel (2), magnetic flap level gauge (19) is divided into 2 tunnels to be connected with one end of temperature sensor five (20) and one end of temperature sensor six (21) respectively, the other end of temperature sensor five (20) is connected with the middle-end of electric control valve one (22), one end of electric control valve one (22) is connected with one end of stop valve three (23), the other end of stop valve three (23) is connected with the liquid refrigerants delivery outlet of refrigerant holding vessel (2), the other end of electric control valve one (22) is connected with the lower end of heat exchanger two (24) side, the upper end of heat exchanger two (24) side is divided into 2 tunnels to be connected with the gaseous coolant input port of visor two (25) with refrigerant holding vessel (2) respectively, the other end of temperature sensor six (21) is divided into 2 tunnels, be connected with one end of pump (27) with one end of stop valve four (26) respectively, the other end of stop valve four (26) is connected with the lower end of heat exchanger two (24) opposite side, the other end of pump (27) is connected with the delivery port of frozen water holding vessel (3), the upper end of heat exchanger two (24) the same side is connected with one end of electric control valve two (28), the middle-end of electric control valve two (28) is connected with the other end of pressure regulator four (16), the other end of electric control valve two (28) is connected with the water inlet of frozen water holding vessel (3).
2. a kind of cold energy of liquefied natural gas recovery system according to claim 1, is characterized in that: described refrigerant is monochlorodifluoromethane.
3. a kind of cold energy of liquefied natural gas recovery system according to claim 1, is characterized in that: described heat exchanger is brazing plate type heat exchanger.
4. a kind of cold energy of liquefied natural gas recovery system according to claim 1, it is characterized in that: the port of the interior connected electromagnetic valve two (6) of described heat exchanger one (7) is connected with the port being connected temperature sensor one (11), and the port connecting temperature sensor three (13) is connected with the port being connected liquid refrigerants input port.
5. a kind of cold energy of liquefied natural gas recovery system according to claim 1, it is characterized in that: the port connecting electric control valve two (28) in described heat exchanger two (24) is connected with the port being connected stop valve four (26), and the port connecting visor two (25) is connected with the port being connected electric control valve one (22).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420587565.XU CN204141916U (en) | 2014-10-11 | 2014-10-11 | A kind of cold energy of liquefied natural gas recovery system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420587565.XU CN204141916U (en) | 2014-10-11 | 2014-10-11 | A kind of cold energy of liquefied natural gas recovery system |
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| Publication Number | Publication Date |
|---|---|
| CN204141916U true CN204141916U (en) | 2015-02-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420587565.XU Expired - Fee Related CN204141916U (en) | 2014-10-11 | 2014-10-11 | A kind of cold energy of liquefied natural gas recovery system |
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| CN (1) | CN204141916U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105737515A (en) * | 2016-03-17 | 2016-07-06 | 上海交通大学 | Natural gas liquefaction system and method based on plate heat exchanger and modular mixed refrigerant |
| CN105890281A (en) * | 2016-04-19 | 2016-08-24 | 上海交通大学 | Skid-mounted natural gas liquefaction and purification integrated cold box |
-
2014
- 2014-10-11 CN CN201420587565.XU patent/CN204141916U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105737515A (en) * | 2016-03-17 | 2016-07-06 | 上海交通大学 | Natural gas liquefaction system and method based on plate heat exchanger and modular mixed refrigerant |
| CN105890281A (en) * | 2016-04-19 | 2016-08-24 | 上海交通大学 | Skid-mounted natural gas liquefaction and purification integrated cold box |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150204 |
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| CF01 | Termination of patent right due to non-payment of annual fee |