CN103742784B - A kind of liquefied natural gas (LNG) tank Zero emission device and technique thereof - Google Patents
A kind of liquefied natural gas (LNG) tank Zero emission device and technique thereof Download PDFInfo
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- CN103742784B CN103742784B CN201410021928.8A CN201410021928A CN103742784B CN 103742784 B CN103742784 B CN 103742784B CN 201410021928 A CN201410021928 A CN 201410021928A CN 103742784 B CN103742784 B CN 103742784B
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- liquid nitrogen
- lng
- natural gas
- tank
- liquefied natural
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- 239000003949 liquefied natural gas Substances 0.000 title claims abstract description 126
- 238000000034 method Methods 0.000 title claims abstract description 21
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 214
- 239000007788 liquid Substances 0.000 claims abstract description 119
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 108
- 230000007246 mechanism Effects 0.000 claims abstract description 31
- 238000012544 monitoring process Methods 0.000 claims abstract description 7
- 230000008569 process Effects 0.000 claims abstract description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 8
- 238000009833 condensation Methods 0.000 claims description 7
- 230000005494 condensation Effects 0.000 claims description 7
- 238000009413 insulation Methods 0.000 claims description 3
- 239000003345 natural gas Substances 0.000 claims description 3
- 230000001276 controlling effect Effects 0.000 claims description 2
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 239000007789 gas Substances 0.000 abstract description 10
- 239000011435 rock Substances 0.000 abstract description 3
- 230000017105 transposition Effects 0.000 description 7
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
Landscapes
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The present invention relates to a kind of liquefied natural gas (LNG) tank Zero emission device and technique thereof, this device comprises liquid nitrogen storage tank, liquid nitrogen inlet tube, uncovered liquid nitrogen storage tank, control system, liquid nitrogen rear pump and valve mechanism, described uncovered liquid nitrogen storage tank uncovered vertically upward be arranged in liquefied natural gas (LNG) tank, be communicated with liquid nitrogen inlet tube one end bottom described uncovered liquid nitrogen storage tank, the described liquid nitrogen inlet tube the other end is communicated with the liquid nitrogen storage tank be positioned at outside liquefied natural gas (LNG) tank, described liquid nitrogen rear pump and valve mechanism are arranged on the liquid nitrogen inlet tube between liquefied natural gas (LNG) tank and liquid nitrogen storage tank, described valve mechanism and liquid nitrogen rear pump set gradually along liquid nitrogen inlet tube feed liquor direction, described control system comprises pressure transducer, supersonic liquid level testing module, display screen, process monitoring information also controls the processor of liquid nitrogen rear pump and valve mechanism.Structure of the present invention is simple, with low cost, can effectively reduce LNG Liquefied natural gas loss, avoid rock gas to the pollution of air.
Description
Technical field
The present invention relates to a kind of liquefied natural gas (LNG) tank Zero emission device and technique thereof.
Background technique
LNG Liquefied natural gas (LNG, liquefied natural gas) is the high-grade energy that a kind of calorific value is high, combustion pollution is little, under being usually stored in about-162 DEG C of cryogenic temperatures and basic barometric pressure.Inevitably there is leakage thermal phenomenon in LNG storage tank, this can cause LNG to occur gasification, and gas pressure in storage tank is increased.The main component of LNG---methane, is a kind of greenhouse gases, has destruction to atmospheric ozone, and its greenhouse usefulness is 22 times of carbon dioxide according to the study.
At present in order to ensure the safe storage of LNG, a kind of method is, after tank inner pressure reaches certain value, discharges a part of boil-off gas, to be maintained in the safety range of license by the pressure in storage tank.But the main component of boil-off gas is methane (content is more than 90%), belongs to flammable explosive gas, dangerous high.Another kind method is, sets up liquefaction device again, by boil-off gas again post liquefaction again store.
Liquid nitrogen at normal atmospheric pressure boiling point is-196 DEG C, is a kind of common industrial gas, and cheap, pollution-free.Can be used for carrying out condensation to LNG boil-off gas.
Summary of the invention
The present invention is directed to above-mentioned prior art Problems existing and make improvement, namely technical problem to be solved by this invention is to provide a kind of liquefied natural gas (LNG) tank Zero emission device and technique thereof, the zero-emission of rock gas can not only be realized, but also automatically can control this process implementation.
In order to solve the problems of the technologies described above, technological scheme one of the present invention is: a kind of liquefied natural gas (LNG) tank Zero emission device, comprise liquid nitrogen storage tank, liquid nitrogen inlet tube, uncovered liquid nitrogen storage tank, control system, liquid nitrogen rear pump and valve mechanism, described uncovered liquid nitrogen storage tank is arranged in liquefied natural gas (LNG) tank, described uncovered liquid nitrogen storage tank uncovered vertically upward, be communicated with liquid nitrogen inlet tube one end bottom described uncovered liquid nitrogen storage tank, the described liquid nitrogen inlet tube the other end is communicated with the liquid nitrogen storage tank be positioned at outside liquefied natural gas (LNG) tank, described liquid nitrogen rear pump and valve mechanism are arranged on the liquid nitrogen inlet tube between liquefied natural gas (LNG) tank and liquid nitrogen storage tank, described valve mechanism and liquid nitrogen rear pump set gradually along liquid nitrogen inlet tube feed liquor direction, described control system comprises the pressure transducer of the pressure signal of monitoring liquefied natural gas (LNG) tank, monitor the supersonic liquid level testing module of the liquid level of uncovered liquid nitrogen storage tank, display screen, process monitoring information also controls the processor of liquid nitrogen rear pump and valve mechanism.
Further, valve mechanism comprises actuator and modulating valve.
Further, described liquid nitrogen rear pump is by motor-driven centrifugal rear pump.
Further, the liquid nitrogen inlet tube between described uncovered liquid nitrogen container and liquid nitrogen tank is the pipeline of insulated piping or parcel heat insulation layer.
Further, described processor comprises PLC, amplifier and input/output module, and described input/output module comprises A/D converter and D/A converter.
In order to solve the problems of the technologies described above, technological scheme two of the present invention is: a kind of liquefied natural gas (LNG) tank technique of zero discharge, this technique adopts above-mentioned device, carries out according to the following steps: (1) pressure transducer is measured liquefied natural gas (LNG) tank internal pressure and imported pressure signal into A/D converter; (2) analogue signal is converted to digital signal by A/D converter, and digital signal is input to PLC; (3) if liquefied natural gas (LNG) tank pressure is greater than setting pressure, PLC outputs signal D/A converter, and digital signal is converted to analogue signal, through amplifier output control valve door mechanism and liquid nitrogen transfer pump; (4) in liquid nitrogen course of conveying, supersonic liquid level testing module measures liquid level in uncovered liquid nitrogen storage tank, and is input in PLC by signal, and when in uncovered liquid nitrogen storage tank, liquid level exceedes setting value, PLC outputs signal throttle down mechanism and liquid nitrogen rear pump; (5) when liquid nitrogen is transported to uncovered liquid nitrogen storage tank, the cold of liquid nitrogen carries out condensation to natural gas vapor and contains the generation of steam, and making basic in the gas-phase space of liquefied natural gas (LNG) tank is nitrogen, and LNG Liquefied natural gas realized cold storage simultaneously; After liquid nitrogen carries out condensation to liquefied natural gas (LNG) tank, when liquefied natural gas (LNG) tank pressure reaches setting pressure again, processor does not start valve mechanism, until pressure reaches liquefied natural gas (LNG) tank when carrying the breakout pressure that safety valve presets, safety valve is opened and is carried out pressure release, discharge nitrogen, until liquefied natural gas (LNG) tank internal pressure is that after normal pressure, safety valve cuts out; (6) step 1 ~ 5 are repeated, until LNG Liquefied natural gas stores end-of-job.
Further, in described step (3) and step (4), actuator in output signal input valve mechanism, the keying of actuator's regulating and controlling valve again.
Further, described setting pressure is less than breakout pressure.
Compared with prior art, the present invention has following beneficial effect: the cold energy that the present invention makes full use of liquid nitrogen reduces the evaporating loss of LNG Liquefied natural gas, has saved a large amount of energy; Meanwhile, the potential safety hazard that rock gas discharges pollution and the initiation thereof caused is avoided; This apparatus structure is simple, is easy to realize.
Below in conjunction with the drawings and specific embodiments, the present invention will be further described in detail.
Accompanying drawing explanation
Fig. 1 is the organigram of the embodiment of the present invention.
In figure: 1-liquefied natural gas (LNG) tank, the uncovered liquid nitrogen storage tank of 2-, 3-pressure transducer, 4-supersonic liquid level testing module, 5-processor, 6-intelligent Pneumatic angle transposition actuator, 7-angle transposition modulating valve, the centrifugal rear pump of 8-, 9-liquid nitrogen storage tank, 10-safety valve, 11-display screen, 12-liquid nitrogen inlet tube.
Embodiment
Embodiment one: as shown in Figure 1, a kind of liquefied natural gas (LNG) tank Zero emission device, comprise liquid nitrogen storage tank 9, inlet tube 12, uncovered liquid nitrogen storage tank 2, control system, motor-driven centrifugal rear pump 8 and valve mechanism, described uncovered liquid nitrogen storage tank 2 diameter is 0.5m, height is 3m, during installation, its upper end is 1m apart from liquefied natural gas (LNG) tank top, and it is 100m that this LNG Liquefied natural gas stores up 1 volume
3, its inner canister diameter phi 3000mm, high 15m, described uncovered liquid nitrogen storage tank 2 uncovered vertically upward, be communicated with liquid nitrogen inlet tube 12 one end bottom described uncovered liquid nitrogen storage tank 2, described liquid nitrogen inlet tube 12 the other end is communicated with the liquid nitrogen storage tank 9 be positioned at outside liquefied natural gas (LNG) tank 1, described centrifugal rear pump 8 and valve mechanism are arranged on the liquid nitrogen inlet tube 12 between liquefied natural gas (LNG) tank 1 and liquid nitrogen storage tank 9, described valve mechanism and centrifugal rear pump 8 set gradually along liquid nitrogen inlet tube 12 feed liquor direction, described control system comprises the pressure transducer 3 of the pressure signal of monitoring liquefied natural gas (LNG) tank 1, monitor the supersonic liquid level testing module 4 of the liquid level of uncovered liquid nitrogen storage tank 2, display screen 11, process monitoring information also controls the processor 5 of centrifugal rear pump 8 and valve mechanism.
In the present embodiment, described valve mechanism comprises intelligent Pneumatic angle transposition actuator 6 and angle transposition modulating valve 7.
In the present embodiment, the liquid nitrogen inlet tube 12 between described uncovered liquid nitrogen container 2 and liquid nitrogen tank 9 is the pipeline of insulated piping or parcel heat insulation layer.
In the present embodiment, described processor 5 comprises PLC, amplifier and input/output module, and described input/output module comprises A/D converter and D/A converter.
A kind of liquefied natural gas (LNG) tank technique of zero discharge, this technique adopts above-mentioned device, carries out according to the following steps: (1) pressure transducer 3 is measured liquefied natural gas (LNG) tank 1 internal pressure and imports pressure signal into A/D converter; (2) analogue signal is converted to digital signal by A/D converter, and digital signal is input to PLC; (3) if liquefied natural gas (LNG) tank 1 pressure is greater than setting pressure, PLC outputs signal D/A converter, and digital signal is converted to analogue signal, through amplifier output control valve door mechanism and centrifugal rear pump 8; (4) in liquid nitrogen course of conveying, supersonic liquid level testing module 4 measures liquid level in uncovered liquid nitrogen storage tank 2, and is input in PLC by signal, and when in uncovered liquid nitrogen storage tank 2, liquid level exceedes setting value, PLC outputs signal throttle down mechanism and centrifugal rear pump 8; (5) when liquid nitrogen is transported to uncovered liquid nitrogen storage tank 2, the cold of liquid nitrogen carries out condensation to natural gas vapor and contains the generation of steam, and making basic in the gas-phase space of liquefied natural gas (LNG) tank 1 is nitrogen, and LNG Liquefied natural gas realized cold storage simultaneously; After liquid nitrogen carries out condensation to liquefied natural gas (LNG) tank 1, when liquefied natural gas (LNG) tank 1 pressure reaches setting pressure again, processor 5 does not start valve mechanism, until pressure reaches liquefied natural gas (LNG) tank 1 when carrying the breakout pressure that safety valve 10 presets, safety valve 10 is opened and is carried out pressure release, discharge nitrogen, until liquefied natural gas (LNG) tank 1 internal pressure is that after normal pressure, safety valve 10 cuts out; (6) step 1 ~ 5 are repeated, until LNG Liquefied natural gas stores end-of-job.
In the present embodiment, in described step (3) and step (4), intelligent Pneumatic angle transposition actuator 6 in output signal input valve mechanism, the keying of intelligent Pneumatic angle transposition actuator 6 controlled angle transposition modulating valve 7 again.
In the present embodiment, described setting pressure is less than breakout pressure.
The foregoing is only preferred embodiment of the present invention, all equalizations done according to the present patent application the scope of the claims change and modify, and all should belong to covering scope of the present invention.
Claims (4)
1. a liquefied natural gas (LNG) tank Zero emission device, it is characterized in that: comprise liquid nitrogen storage tank, liquid nitrogen inlet tube, uncovered liquid nitrogen storage tank, control system, liquid nitrogen rear pump and valve mechanism, described uncovered liquid nitrogen storage tank is arranged in liquefied natural gas (LNG) tank, described uncovered liquid nitrogen storage tank uncovered vertically upward, be communicated with liquid nitrogen inlet tube one end bottom described uncovered liquid nitrogen storage tank, the described liquid nitrogen inlet tube the other end is communicated with the liquid nitrogen storage tank be positioned at outside liquefied natural gas (LNG) tank, described liquid nitrogen rear pump and valve mechanism are arranged on the liquid nitrogen inlet tube between liquefied natural gas (LNG) tank and liquid nitrogen storage tank, described valve mechanism and liquid nitrogen rear pump set gradually along liquid nitrogen inlet tube feed liquor direction, described control system comprises the pressure transducer of the pressure signal of monitoring liquefied natural gas (LNG) tank, monitor the supersonic liquid level testing module of the liquid level of uncovered liquid nitrogen storage tank, display screen, process monitoring information also controls the processor of liquid nitrogen rear pump and valve mechanism, described valve mechanism comprises actuator and modulating valve, described liquid nitrogen rear pump is by motor-driven centrifugal rear pump, liquid nitrogen inlet tube between described uncovered liquid nitrogen container and liquid nitrogen tank is the pipeline of insulated piping or parcel heat insulation layer, described processor comprises PLC, amplifier and input/output module, and described input/output module comprises A/D converter and D/A converter.
2. a liquefied natural gas (LNG) tank technique of zero discharge, this technique adopts device according to claim 1, it is characterized in that, carries out according to the following steps: (1) pressure transducer is measured liquefied natural gas (LNG) tank internal pressure and imported pressure signal into A/D converter; (2) analogue signal is converted to digital signal by A/D converter, and digital signal is input to PLC; (3) if liquefied natural gas (LNG) tank pressure is greater than setting pressure, PLC outputs signal D/A converter, and digital signal is converted to analogue signal, through amplifier output control valve door mechanism and liquid nitrogen transfer pump; (4) in liquid nitrogen course of conveying, supersonic liquid level testing module measures liquid level in uncovered liquid nitrogen storage tank, and is input in PLC by signal, and when in uncovered liquid nitrogen storage tank, liquid level exceedes setting value, PLC outputs signal throttle down mechanism and liquid nitrogen rear pump; (5) when liquid nitrogen is transported to uncovered liquid nitrogen storage tank, the cold of liquid nitrogen carries out condensation to natural gas vapor and contains the generation of steam, and making basic in the gas-phase space of liquefied natural gas (LNG) tank is nitrogen, and LNG Liquefied natural gas realized cold storage simultaneously; After liquid nitrogen carries out condensation to liquefied natural gas (LNG) tank, when liquefied natural gas (LNG) tank pressure reaches setting pressure again, processor does not start valve mechanism, until pressure reaches liquefied natural gas (LNG) tank when carrying the breakout pressure that safety valve presets, safety valve is opened and is carried out pressure release, discharge nitrogen, until liquefied natural gas (LNG) tank internal pressure is that after normal pressure, safety valve cuts out; (6) step 1 ~ 5 are repeated, until LNG Liquefied natural gas stores end-of-job.
3. liquefied natural gas (LNG) tank technique of zero discharge according to claim 2, is characterized in that: in described step (3) and step (4), actuator in output signal input valve mechanism, the keying of actuator's regulating and controlling valve again.
4. liquefied natural gas (LNG) tank technique of zero discharge according to claim 2, is characterized in that: described setting pressure is less than breakout pressure.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410021928.8A CN103742784B (en) | 2014-01-18 | 2014-01-18 | A kind of liquefied natural gas (LNG) tank Zero emission device and technique thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410021928.8A CN103742784B (en) | 2014-01-18 | 2014-01-18 | A kind of liquefied natural gas (LNG) tank Zero emission device and technique thereof |
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| Publication Number | Publication Date |
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| CN103742784A CN103742784A (en) | 2014-04-23 |
| CN103742784B true CN103742784B (en) | 2015-09-09 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105627096A (en) * | 2015-09-11 | 2016-06-01 | 荆门宏图特种飞行器制造有限公司 | LNG storage tank |
| CN105570663A (en) * | 2016-02-19 | 2016-05-11 | 新奥科技发展有限公司 | LNG (Liquefied Natural Gas) storage tank assembly and LNG temperature control method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5121609A (en) * | 1991-05-17 | 1992-06-16 | Minnesota Valley Engineering | No loss fueling station for liquid natural gas vehicles |
| CN1510328A (en) * | 2002-12-20 | 2004-07-07 | 中国科学院理化技术研究所 | Zero-emission liquefied natural gas storage tank device |
| CN1871474A (en) * | 2003-09-01 | 2006-11-29 | 克里奥斯塔股份有限公司 | Controlled storage of liquefied gases |
| CN102011939A (en) * | 2010-10-28 | 2011-04-13 | 华南理工大学 | System and method for temperature reduction and pressure stabilization of liquefied natural gas storage tank |
| CN102644847A (en) * | 2012-05-10 | 2012-08-22 | 昆山市恒安工业气体有限公司 | Pressure detecting system of gas storage tank |
| CN102927441A (en) * | 2012-11-01 | 2013-02-13 | 青岛瑞丰气体有限公司 | Gas filling control system based on android system |
-
2014
- 2014-01-18 CN CN201410021928.8A patent/CN103742784B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5121609A (en) * | 1991-05-17 | 1992-06-16 | Minnesota Valley Engineering | No loss fueling station for liquid natural gas vehicles |
| CN1510328A (en) * | 2002-12-20 | 2004-07-07 | 中国科学院理化技术研究所 | Zero-emission liquefied natural gas storage tank device |
| CN1871474A (en) * | 2003-09-01 | 2006-11-29 | 克里奥斯塔股份有限公司 | Controlled storage of liquefied gases |
| CN102011939A (en) * | 2010-10-28 | 2011-04-13 | 华南理工大学 | System and method for temperature reduction and pressure stabilization of liquefied natural gas storage tank |
| CN102644847A (en) * | 2012-05-10 | 2012-08-22 | 昆山市恒安工业气体有限公司 | Pressure detecting system of gas storage tank |
| CN102927441A (en) * | 2012-11-01 | 2013-02-13 | 青岛瑞丰气体有限公司 | Gas filling control system based on android system |
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