CN206338582U - A kind of liquefied natural gas gasifying system - Google Patents
A kind of liquefied natural gas gasifying system Download PDFInfo
- Publication number
- CN206338582U CN206338582U CN201621377693.7U CN201621377693U CN206338582U CN 206338582 U CN206338582 U CN 206338582U CN 201621377693 U CN201621377693 U CN 201621377693U CN 206338582 U CN206338582 U CN 206338582U
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- CN
- China
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- natural gas
- pipeline
- liquefied natural
- air temperature
- gasifier
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Abstract
A kind of liquefied natural gas gasifying system, including storage tank, liquefied natural gas air temperature gasifier, No. two liquefied natural gas air temperature gasifiers, natural gas vaporization gas air temperature gasifier, liquefied natural gas regulator, metering device, natural gas vaporization controlled atmosphere pressure device, a water bath type gasifiers, it is characterised in that：The storage tank connects liquefied natural gas air temperature gasifier, No. two liquefied natural gas air temperature gasifiers, natural gas vaporization gas air temperature gasifier, liquefied natural gas regulator, metering device, natural gas vaporization controlled atmosphere pressure device, a water bath type gasifiers by pipeline.The utility model liquefied natural gas air temperature gasifier makes liquefied natural gas be gasified, natural gas vaporization gas gasifier makes natural gas vaporization gas be gasified, realize liquefied natural gas and natural gas vaporization qi leel opens heating, supplied after gasification to gas consuming device, the gas discharge of gas consuming device can be increased.
Description
Technical field
The utility model is related to natural gas gasifying technical field, specially a kind of liquefied natural gas gasifying system.
Background technology
During liquefied natural gas enters gasifier from storage tank, when initial, because liquefied natural gas gravity is larger in tank,
Liquefied natural gas is easy to flow into gasifier from storage tank, and as liquefied natural gas is constantly reduced, storage tank liquid outlet outside pressure is big
Outflow is would become hard to, it is necessary to be pressurized using booster to tank inside in the liquefied natural gas in inside pressure, tank, adds system
Cost and system complexity；The pressure needed for natural gas typically can be all used higher than user due to the pressure of pipe natural gas, this
It is accomplished by the pressure of pipe natural gas to drop to user using required pressure；In natural gas gasifying system, because liquid day
Substantial amounts of boil-off gas, that is, natural gas vaporization gas, and the steaming of this part can be produced during right gas storage and use
The pressure for the pressure ratio liquefied natural gas got angry is high, is used if the pipeline of the pipeline of boil-off gas and liquefied natural gas converged,
Can be slightly higher because of evaporation atmospheric pressure, the flowing of liquefied natural gas is hindered, so that it cannot be guaranteed that the traffic requirement in downstream.
The content of the invention
The technical problems to be solved in the utility model is to overcome existing defect there is provided a kind of liquefied natural gas gasifying system
System, liquefied natural gas air temperature gasifier makes liquefied natural gas be gasified, and natural gas vaporization gas gasifier makes liquefaction natural
Gas boil-off gas is gasified, and realizes liquefied natural gas and natural gas vaporization qi leel opens heating, and gas consuming device is given after gasification
Supply, can increase the gas discharge of gas consuming device；It is standby that two pressure regulation pipelines arranged side by side in regulator open one using one
Operation, when the pressure regulator of operating pressure regulation pipeline breaks down, then the ball valve that can be closed before and after pressure regulator is opened standby
Ball valve supply before and after the pressure regulator of road, while the maintenance of failure pressure regulator can be carried out conveniently, can effectively ensure that the safety of natural gas
Supply；By the way that the natural gas after liquefied natural gas air temperature gasifier gasification to be led back to the upper storage space of storage tank, in tank
Liquefied natural gas is pressurized, and is eliminated the design of conventional booster, has been saved system cost, reduces system complexity.
The technical solution of the utility model is：A kind of liquefied natural gas gasifying system, including storage tank, a liquefied natural gas
Air temperature gasifier, No. two liquefied natural gas air temperature gasifiers, natural gas vaporization gas air temperature gasifier, liquefied natural gas pressure regulation
Device, metering device, natural gas vaporization controlled atmosphere pressure device, water bath type gasifier, it is characterised in that：The storage tank passes through pipe
Road connects liquefied natural gas air temperature gasifier, No. two liquefied natural gas air temperature gasifiers, a natural gas vaporization gas air temperatures
Gasifier, liquefied natural gas regulator, metering device, natural gas vaporization controlled atmosphere pressure device, water bath type gasifier, it is described
Storage tank connects two liquefaction in parallel by pipeline provided with liquid outlet, backflow import, the outlet of natural gas vaporization gas, liquid outlet
Natural gas air temperature gasification pipe a, pipeline is connected with a liquefied natural gas air temperature gasifier, a liquefied natural gas air temperature
Gasifier includes liquefied natural gas feed tube, escaping pipe, and another pipeline is connected with No. two liquefied natural gas air temperature gasifiers, two
Number liquefied natural gas air temperature gasifier connects temperature transmitter after including liquefied natural gas feed tube, escaping pipe, escaping pipe, described
Escaping pipe is connected with three-way connection (pipe) road, the first pipeline connection control valve, then is connected with backflow import, and the second pipeline and the first pipeline are simultaneously
Connection, the second pipeline connection boost adjusted valve, then be connected with backflow import, temperature transmitter is connected with the 3rd pipeline, liquefy day
Right gas boil-off gas outlet is connected with gas phase valve, natural gas vaporization gas air temperature gasifier, temperature pick-up in turn by pipeline
Device, bleeding device, No. three pressure transmitters, a natural gas vaporization controlled atmosphere pressure devices, natural gas vaporization gas air temperature
Gasifier includes natural gas vaporization gas air inlet pipe, escaping pipe, the natural gas vaporization controlled atmosphere pressure device, including two
Pipeline in parallel, first pipeline includes No. five ball valves, pressure regulator, pressure gauge, No. six ball valves, and No. five ball valves are linked in sequence pressure regulation
Device, pressure gauge, No. six ball valves, Article 2 pipeline include pipeline after No. five ball valves, a bleeding device connect No. three bleeding devices,
No. two bleeding devices, diffusion valves, after temperature transmitter, the output end of the parallel pipeline of temperature transmitter two each merge, pass through pipe
Road connects No. three bleeding devices, No. seven ball valves, enters water bath type gasifier ball valve, enters water bath type gasifier ball valve and passes through pipeline and water
Bathing gasifier, go out the connection of water bath type gasifier ball valve, the water bath type gasifier, including cylinder, coiled heat exchanger tube, electricity
Heater, goes out after the outlet of water bath type gasifier ball valve converges with No. seven ball valve outlets and is connected a pressure transmitter by pipeline,
Pipeline is connected with liquefied natural gas regulator after a number pressure transmitter, the liquefied natural gas regulator, including two
Pressure regulation pipeline in parallel, each pressure regulation pipeline includes ball valve, filter, pressure regulator, pressure gauge, diffusion valve, No. two balls
Valve a, ball valve is linked in sequence filter, pressure regulator, pressure gauge, diffusion valve, No. two ball valves, and two No. two ball valves converge
It is connected afterwards by pipeline with pipeline, No. two bleeding devices, metering devices after natural gas vaporization controlled atmosphere pressure device, the metering
Device, including two pipelines in parallel, first pipeline include No. three ball valves, flowmeter, diffusion valve, No. four ball valves, No. three balls
Valve is linked in sequence flowmeter, diffusion valve, No. four ball valves, and Article 2 pipeline includes pipeline connection two after No. three ball valves, metering device
Number pressure transmitter, gas consuming device.
The beneficial effects of the utility model are：The utility model provides a kind of liquefied natural gas gasifying system, and liquefaction is natural
Gas air temperature gasifier makes liquefied natural gas be gasified, and natural gas vaporization gas gasifier carries out natural gas vaporization gas
Gasification, realizes liquefied natural gas and natural gas vaporization qi leel opens heating, supplies, can increase to gas consuming device after gasification
The gas discharge of gas consuming device；Two pressure regulation pipelines arranged side by side in regulator open a received shipment row using one, when in operation
The pressure regulator of pressure regulation pipeline when breaking down, the ball valve that can be closed before and after pressure regulator, before and after then opening standby road pressure regulator
Ball valve supply, while can conveniently carry out failure pressure regulator maintenance, can effectively ensure that the safe way of natural gas；By by liquid
Change the upper storage space that the natural gas after natural gas air temperature gasifier gasification leads back storage tank, the liquefied natural gas in tank is carried out
Supercharging, eliminates the design of conventional booster, has saved system cost, reduce system complexity.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model.
In Fig. 1,1. storage tanks, a No. 2. liquefied natural gas air temperature gasifiers, 3. No. two liquefied natural gas air temperature gasifiers, 4.
Natural gas vaporization gas air temperature gasifier, 5. liquefied natural gas regulators, 6. metering devices, 7. natural gas vaporization gas
Regulator, 8. water bath type gasifiers, 9. liquid outlets, 10. first pipelines, 11. second pipelines, 12. control valves, 13. boostings are adjusted
Section valve, 14. the 3rd pipelines, 15. backflow imports, No. 16. bleeding devices, 17. No. two bleeding devices, 18. No. three bleeding devices,
19. diffusion valve, 21. liquefied natural gas feed tubes, 22. escaping pipes, 23. temperature transmitters, 31. liquefied natural gas feed tubes, 32.
Escaping pipe, 33. temperature transmitters, 41. natural gas vaporization gas air inlet pipe, 42. escaping pipes, 43. temperature transmitters, 51. 1
Number ball valve, 52. filters, 53. pressure regulators, 54. pressure gauges, 55. diffusion valves, 56. No. two ball valves, 61. No. three ball valves, 62. streams
Gauge, 63. diffusion valves, 64. No. four ball valves, 71. No. five ball valves, 72. pressure regulators, 73. pressure gauges, 74. No. six ball valves, 81.
Body, 82. coiled heat exchanger tubes, 83. electric heaters, 84. enter water bath type gasifier ball valve, and 85. go out water bath type gasifier ball valve,
91. No. seven ball valves, No. 92. pressure transmitters, 93. No. two pressure transmitters, 94. gas consuming devices, 95. natural gas vaporizations
Gas is exported, 96. No. three pressure transmitters, 97. gas phase valves.
Embodiment
The utility model is further described below in conjunction with the accompanying drawings.
As shown in figure 1, the utility model is a kind of liquefied natural gas gasifying system, including storage tank 1, a liquefied natural gas
Air temperature gasifier 2, No. two liquefied natural gas air temperature gasifiers 3, natural gas vaporization gas air temperature gasifier 4, liquefied natural gas
Regulator 5, metering device 6, natural gas vaporization controlled atmosphere pressure device 7, water bath type gasifier 8, it is characterised in that：The storage
Tank 1 connects liquefied natural gas air temperature gasifier 2, No. two liquefied natural gas air temperature gasifiers 3, a liquefied natural gas by pipeline
Boil-off gas air temperature gasifier 4, liquefied natural gas regulator 5, metering device 6, natural gas vaporization controlled atmosphere pressure device 7, water
Bathing gasifier 8, the storage tank 1 is provided with liquid outlet 9, backflow import 15, natural gas vaporization gas outlet 95, and liquid outlet 9 leads to
Piping connection two liquefied natural gas air temperature gasification pipes in parallel a, pipeline is connected with a liquefied natural gas air temperature gas
Change device 2, a liquefied natural gas air temperature gasifier 2 includes liquefied natural gas feed tube 21, escaping pipe 22, another pipeline connection
Have a No. two liquefied natural gas air temperature gasifiers 3, No. two liquefied natural gas air temperature gasifiers 3 include liquefied natural gas feed tube 31,
Temperature transmitter 33 is connected after escaping pipe 32, escaping pipe 32, the escaping pipe 22 is connected with three-way connection (pipe) road, and the first pipeline 10 connects
Control valve 12 is connect, then is connected with backflow import 15, the second pipeline 11 is in parallel with the first pipeline 10, the connection boosting of the second pipeline 11 is adjusted
Valve 13 is saved, then is connected with backflow import 15, temperature transmitter 23, the outlet of natural gas vaporization gas are connected with the 3rd pipeline 14
95 by pipeline be connected with turn gas phase valve 97, natural gas vaporization gas air temperature gasifier 4, temperature transmitter 43, No. one
Bleeding device 16, No. three pressure transmitters 96, natural gas vaporization controlled atmosphere pressure devices 7, natural gas vaporization gas air temperature gas
Change device 4 include natural gas vaporization gas air inlet pipe 41, escaping pipe 42, the natural gas vaporization controlled atmosphere pressure device 7, including
Two pipelines in parallel, first pipeline includes No. five ball valves 71, pressure regulator 72, pressure gauge 73, No. six ball valves 74, No. five ball valves
71 are linked in sequence pressure regulator 72, pressure gauge 73, No. six ball valves 74, and Article 2 pipeline includes No. five ball valves 71, a bleeding device
Pipeline connects No. three bleeding devices 18, No. two bleeding devices 17, diffusion valves 19, temperature transmitter 23, temperature transmitter 33 after 16
After the output end of two parallel pipelines each merges, No. three bleeding devices 18, No. seven ball valves 91 are connected by pipeline, enter water-bath type gas
Change device ball valve 84, enter water bath type gasifier ball valve 84 by pipeline and water bath type gasifier 8, go out water bath type gasifier ball valve 85 and connect
Connect, the water bath type gasifier 8, including cylinder 81, coiled heat exchanger tube 82, electric heater 83, go out water bath type gasifier ball valve
85 outlets are connected after a pressure transmitter 92, a pressure transmitter 92 by pipeline after converging with No. seven outlets of ball valve 91 and managed
Road is connected with liquefied natural gas regulator 5, the liquefied natural gas regulator 5, including two pressure regulation pipelines in parallel, often
One pressure regulation pipeline includes ball valve 51, filter 52, pressure regulator 53, pressure gauge 54, diffusion valve 55, No. two ball valves 56, institute
A ball valve 51 is stated to be linked in sequence filter 52, pressure regulator 53, pressure gauge 54, diffusion valve 55, No. two ball valves 56, two No. two balls
Valve 56 converge after by pipeline, No. two bleeding devices 17, metering devices 6 after pipeline and natural gas vaporization controlled atmosphere pressure device 7
Connection, the metering device 6, including two pipelines in parallel, first pipeline include No. three ball valves 61, flowmeters 62, diffused
Valve 63, No. four ball valves 64, No. three ball valves 61 are linked in sequence flowmeter 62, diffusion valve 63, No. four ball valves 64, and Article 2 pipeline includes
Pipeline connects No. two pressure transmitters 93, gas consuming devices 94 after No. three ball valves 61, metering device 6.
The course of work of the present utility model：
Liquified natural gas is transported to storage tank 1 using low-temperature tanker, using a liquefied natural gas air temperature gasifier 2, No. two
Liquefied natural gas air temperature gasifier 3 is gasified, and saves the side of being linked in sequence between the energy, the heat exchanger tube being arranged side by side by taking
Formula, realizes the raising of gasification efficiency, liquified natural gas is gasified；
A liquefied natural gas air temperature gasifier 2, No. two liquefied natural gas air temperature gasifiers 3 can not when ambient temperatures are low
Liquified natural gas is gasified completely, this is accomplished by the water bath type gasifier 8 using forced heat-exchanging, gasifies by the use of electric energy as thermal source
Liquified natural gas, liquified natural gas enters coiled heat exchanger tube 82 from feed tube, is exchanged heat by disappearing the coiled in warm water
Pipe 82 complete gasify simultaneously overheat, the heat energy of warm water is provided by bottom electric heater 83 in cylinder 81, final gaseous natural gas along
Airflow direction enters liquefied natural gas regulator 5 from escaping pipe output, carries out pressure regulation；
When the liquefied natural gas regulator 5 is run, a ball valve 51 of the pressure regulation pipeline used is slowly opened first, is adjusted
The pressure of pressure regulator 53 is saved, No. two ball valves 56 after pressure regulator 53 are opened, the reading of pressure gauge 54 is observed, adjusts outlet pressure
To required pressure；When being broken down using the pressure regulator 53 on road, a ball valve 51 closing before and after it, No. two ball valves 56,
Slowly open a ball valve 51 on standby road；
When pressure can not meet fluid pressure demand in liquefied natural gas storage tank 1, a liquefied natural gas air temperature gasification
Natural gas in the escaping pipe 22 of device 2 is back to the upper space of liquefied natural gas storage tank 1 by the first pipeline 10, in storage tank 1
Remaining liquified natural gas is pressurized, and liquified natural gas is discharged to a liquefied natural gas air temperature gasifier 2, No. two liquefaction
Natural gas air temperature gasifier 3, when pressure meets fluid pressure demand again in liquefied natural gas storage tank 1, the first pipeline 10 breaks
Open；
When the first pipeline 10 of unlatching still can not meet fluid pressure demand, the second pipeline 11 is opened, utilizes boosting to adjust
Section valve 13 is pressurized to natural gas, is passed to the second pipeline 11 and is back to the upper space of liquefied natural gas storage tank 1, to storage tank
Remaining liquified natural gas is pressurized in 1, make liquified natural gas be discharged to a liquefied natural gas air temperature gasifier 2, No. two
Liquefied natural gas air temperature gasifier 3, when pressure meets and only needs the first pipeline 10 to liquid natural again in liquefied natural gas storage tank 1
When the progress supercharging of gas storage tank 1 can go out liquid, the second pipeline 11 disconnects；
Gas phase valve 97 is opened, natural gas vaporization gas passes through natural gas vaporization gas air temperature gas by gas phase pipeline
Change after the gasification of device 4, through the pressure regulation of natural gas vaporization controlled atmosphere pressure device 7, into metering device 6, be transported to gas consuming device 94, it is real
Existing liquefied natural gas and natural gas vaporization qi leel open heating, are supplied after gasification to gas consuming device 94, can increase whole with gas
The gas discharge at end 94.
As can be seen here, the utility model provides a kind of liquefied natural gas gasifying system, and liquefied natural gas air temperature gasifier makes
Liquefied natural gas is gasified, and natural gas vaporization gas gasifier makes natural gas vaporization gas be gasified, and realizes liquid
Change natural gas and natural gas vaporization qi leel opens heating, supplied after gasification to gas consuming device, the day of gas consuming device can be increased
Right throughput；Two pressure regulation pipelines arranged side by side in regulator open a received shipment row using one, when operating pressure regulation pipeline
When pressure regulator breaks down, then the ball valve that can be closed before and after pressure regulator opens the ball valve supply before and after standby road pressure regulator, together
When can conveniently carry out failure pressure regulator maintenance, can effectively ensure that the safe way of natural gas；By by liquefied natural gas air temperature
Natural gas after gasifier gasification leads back the upper storage space of storage tank, and the liquefied natural gas in tank is pressurized, eliminated
The design of conventional booster, has saved system cost, reduces system complexity.
Claims (1)
1. a kind of liquefied natural gas gasifying system, including storage tank, liquefied natural gas air temperature gasifier, No. two liquefied natural gas
Air temperature gasifier, natural gas vaporization gas air temperature gasifier, liquefied natural gas regulator, metering device, liquefied natural gas
Boil-off gas regulator, water bath type gasifier, it is characterised in that：The storage tank connects a liquefied natural gas air temperature by pipeline
Gasifier, No. two liquefied natural gas air temperature gasifiers, natural gas vaporization gas air temperature gasifier, liquefied natural gas pressure regulation dresses
Put, metering device, natural gas vaporization controlled atmosphere pressure device, water bath type gasifier, the storage tank provided with liquid outlet, flow back into
Mouth, the outlet of natural gas vaporization gas, liquid outlet pass through pipeline and connect two liquefied natural gas air temperature gasification pipes in parallel, one
Bar pipeline is connected with a liquefied natural gas air temperature gasifier, and a liquefied natural gas air temperature gasifier enters including liquefied natural gas
Liquid pipe, escaping pipe, another pipeline are connected with No. two liquefied natural gas air temperature gasifiers, No. two liquefied natural gas air temperature gasifiers
Including liquefied natural gas feed tube, escaping pipe, temperature transmitter is connected after escaping pipe, the escaping pipe is connected with three-way connection (pipe) road,
First pipeline connection control valve, then be connected with backflow import, the second pipeline is in parallel with the first pipeline, and the connection boosting of the second pipeline is adjusted
Valve is saved, then is connected with backflow import, temperature transmitter is connected with the 3rd pipeline, the outlet of natural gas vaporization gas passes through pipeline
It is connected with gas phase valve, natural gas vaporization gas air temperature gasifier, temperature transmitter, bleeding device, No. three pressures in turn
Power transmitter, natural gas vaporization controlled atmosphere pressure device, natural gas vaporization gas air temperature gasifier steam including liquefied natural gas
Get angry air inlet pipe, escaping pipe, the natural gas vaporization controlled atmosphere pressure device, including two pipelines in parallel, first pipeline
Including No. five ball valves, pressure regulator, pressure gauge, No. six ball valves, No. five ball valves are linked in sequence pressure regulator, pressure gauge, No. six ball valves,
Two pipelines include pipeline after No. five ball valves, a bleeding device and connect No. three bleeding devices, No. two bleeding devices, diffusion valves,
After temperature transmitter, the output end of the parallel pipeline of temperature transmitter two each merge, No. three bleeding devices, seven are connected by pipeline
Number ball valve, enter water bath type gasifier ball valve, enter water bath type gasifier ball valve by pipeline and water bath type gasifier, go out water-bath type gas
Change the connection of device ball valve, the water bath type gasifier, including cylinder, coiled heat exchanger tube, electric heater, go out water bath type gasifier ball
Valve outlet is connected pipeline and liquid after a pressure transmitter, a pressure transmitter after converging with No. seven ball valve outlets by pipeline
Change the connection of natural gas pressure regulating device, the liquefied natural gas regulator, including two pressure regulation pipelines in parallel, each pressure regulation
Pipeline includes ball valve, filter, pressure regulator, pressure gauge, diffusion valve, No. two ball valves, and a ball valve was linked in sequence
Filter, pressure regulator, pressure gauge, diffusion valve, No. two ball valves, two No. two ball valves converge after by pipeline and natural gas vaporization
Pipeline, No. two bleeding devices, metering device connections, the metering device, including two pipelines in parallel after controlled atmosphere pressure device, the
One pipeline includes No. three ball valves, flowmeter, diffusion valve, No. four ball valves, and No. three ball valves are linked in sequence flowmeter, diffusion valve, four
Number ball valve, Article 2 pipeline includes pipeline after No. three ball valves, metering device and connects No. two pressure transmitters, gas consuming devices.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621377693.7U CN206338582U (en) | 2016-12-10 | 2016-12-10 | A kind of liquefied natural gas gasifying system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621377693.7U CN206338582U (en) | 2016-12-10 | 2016-12-10 | A kind of liquefied natural gas gasifying system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206338582U true CN206338582U (en) | 2017-07-18 |
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ID=59301299
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621377693.7U Expired - Fee Related CN206338582U (en) | 2016-12-10 | 2016-12-10 | A kind of liquefied natural gas gasifying system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206338582U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107327702A (en) * | 2017-08-07 | 2017-11-07 | 苏州新锐低温设备有限公司 | A kind of Large LNG gasification double-channel voltage-regulating is integrally prized |
| CN107830403A (en) * | 2017-10-25 | 2018-03-23 | 上海新奥新能源技术有限公司 | A kind of liquefied natural gas liquid-supplying system |
-
2016
- 2016-12-10 CN CN201621377693.7U patent/CN206338582U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107327702A (en) * | 2017-08-07 | 2017-11-07 | 苏州新锐低温设备有限公司 | A kind of Large LNG gasification double-channel voltage-regulating is integrally prized |
| CN107830403A (en) * | 2017-10-25 | 2018-03-23 | 上海新奥新能源技术有限公司 | A kind of liquefied natural gas liquid-supplying system |
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|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170718 Termination date: 20191210 |
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| CF01 | Termination of patent right due to non-payment of annual fee |