CN104482396A - Novel high-efficiency BOG recovery system with cold storage function - Google Patents
Novel high-efficiency BOG recovery system with cold storage function Download PDFInfo
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- CN104482396A CN104482396A CN201410630999.8A CN201410630999A CN104482396A CN 104482396 A CN104482396 A CN 104482396A CN 201410630999 A CN201410630999 A CN 201410630999A CN 104482396 A CN104482396 A CN 104482396A
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- 238000003860 storage Methods 0.000 title claims abstract description 164
- 238000011084 recovery Methods 0.000 title claims abstract description 23
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 192
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 96
- 239000007789 gas Substances 0.000 claims abstract description 46
- 238000000034 method Methods 0.000 claims abstract description 36
- 238000007906 compression Methods 0.000 claims abstract description 5
- 230000006835 compression Effects 0.000 claims abstract description 5
- 238000001816 cooling Methods 0.000 claims abstract description 5
- 238000004064 recycling Methods 0.000 claims description 40
- 238000009413 insulation Methods 0.000 claims description 22
- 230000008054 signal transmission Effects 0.000 claims description 5
- 230000006698 induction Effects 0.000 claims description 4
- 238000011282 treatment Methods 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 2
- 238000011896 sensitive detection Methods 0.000 claims 2
- 238000009833 condensation Methods 0.000 abstract description 5
- 230000005494 condensation Effects 0.000 abstract description 5
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 239000002699 waste material Substances 0.000 abstract description 3
- 238000007599 discharging Methods 0.000 abstract 1
- 239000003949 liquefied natural gas Substances 0.000 description 25
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000007907 direct compression Methods 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000010926 purge Methods 0.000 description 2
- 238000003916 acid precipitation Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000003502 gasoline Substances 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention discloses a novel high-efficiency low-energy consumption boil off gas (BOG) recovery process with cold storage function, and a device thereof. The device comprises a LNG storage tank, a nitrogen storage tank, a compressor, a first cold storage tank, an expansion machine, a BOG condensation recovery device, and a second cold storage tank. According to the device, nitrogen from the nitrogen storage tank is subjected to compression so as to obtain compressed nitrogen; and the compressed nitrogen is delivered through one of the cold storage tanks (which is processed via cold storage at a precooling preparing stage) for cooling, is delivered into the expansion machine after temperature reducing, is delivered into the BOG condensation recovery device for heat exchange with BOG gas after further temperature reducing so as to liquify BOG gas, and then is delivered through the other cold storage tank, and at last is delivered into the nitrogen storage tank after temperature increasing. The novel high-efficiency low-energy consumption boil off gas (BOG) recovery process is simple in process flow; some professional devices are not necessary; automatic controlling is realized; nitrogen can be recycled; waste caused by nitrogen discharging is reduced; investment is reduced; and industrial popularization and market application prospect is promising.
Description
Technical field
Patent of the present invention relates to technical field such as LNG (LNG Liquefied natural gas) accumulating and use etc., is the new and effective device of commercial recovery BOG.
Background technique
China's natural gas resource reserve enriches, and demand growth is accelerated day by day.Compared with gasoline, diesel oil, LNG is as automobile, ship power fuel, have good safety, environmental protection, economic dispatch advantage, being not only one of the emphasis propelling project of the marine energy-saving and emission-reduction of China (Ministry of Communications " " 12 " water transport energy-saving and emission-reduction totally advance embodiment ") is also the emphasis strong industry (" People's Republic of China's national economy and social development the 12 five-year-plan outline ", " National Development and Reform Commission is about the instruction accelerating to advance gas storage Facilities Construction ") that central authorities and the Committee of Development and Reform support.The main component of LNG is methane, presents gaseous state at normal temperatures and pressures, but in accumulating and sale using process, need by the rock gas of gaseous state under normal temperature and pressure at 0.1MPa, at-163 DEG C, liquefied storage is in the storage tank of LNG.Due to reasons such as external heat invasion and attack and some leakage heat, again gasify making the LNG in storage tank, produce a large amount of BOG (Boil Off Gas) gas, these gases raise making the pressure in storage tank rapidly, not only can damage the structure of storage tank, causing danger also to the safe operation of system, is the serious restriction that LNG project is pushed ahead fast.If by these evacuate air, not only cause the wasting of resources, and easily explosion caused, bring potential safety hazard, and haze, acid rain and greenhouse effect caused by toxic emission are also very important, therefore must reclaim.If reclaim this part gas, then economic benefit is very considerable.
BOG recovery technology common at present mainly contains the direct compression process of BOG and BOG condensation liquefaction technique again.Direct compression is that BOG gas is directly improved its pressure after compressor compression, and then by outer other equipment use of defeated supply of pipe network, although this technique flow process is simple, power consumption is comparatively large, and the cost building pipe network is also higher; BOG is condensation liquefaction technique again, be by the BOG that is separated through knockout drum by compressor pressurizes to certain pressure, the LNG of uniform pressure is gone out by the first order transport pump in storage tank, because the pressure of LNG after pump pressurization is greater than the saturation pressure of LNG at this temperature, there is certain " aobvious cold " property, after-condenser is provided with ratio control system, the LNG stream amount of after-condenser is entered according to the flow control of BOG, both direct contact heat transfers in after-condenser, utilize " aobvious cold " of LNG by most of BOG condensation.In these two kinds of techniques, BOG compressor is the key equipment of BOG Gas recovery, and the normal safe being related to main equipment LNG storage tank runs.General employing low temperature oilless reciprocating compressor at present, domestic Compressor Manufacturing factory there is no design, manufacture such mature experience without oily reciprocating compressor, main dependence on import, and the data of the statistical technique data of BOG compressor fault analysis aspect and operational reliability aspect neither be very perfect.
Summary of the invention
In order to overcome deficiency and the defect of prior art, the object of the present invention is to provide that a kind of flow process is simple, energy utilization rate is high, high efficiency, low cost, there is the technological process that the BOG that stores up cold function reclaims.The method does not need BOG compressor and some large-scale machinery in BOG callback course, adopts common compressor and decompressor to make the enough low energy of the temperature of nitrogen and BOG gas converting heat make it liquefy.Nitrogen can recycle, and adds the application of cold storage tank in whole technique again, and the method can save the energy and equipment operating cost greatly, and principle is simple, compact structure, and energy-conserving and environment-protective can be widely used in the occasion that various BOG reclaims.
The object of the invention is to be achieved through the following technical solutions:
New and effective has a BOG reclaiming system of storing up cold function, comprises nitrogen storage tank, pressure meter, flowmeter, common valve, double-screw compressor, a cold storage tank, 9 autocontrol valves, turbine radial expansion machine, BOG condensate recycling device, LNG storage tank, No. two cold storage tanks, temperature inductor, pressure inductor and automatic control systems.The outlet of nitrogen storage tank is connected by pipeline with the entrance of double-screw compressor, with flowmeter and common valve above pipeline; The outlet bifurcation of double-screw compressor, one is connected with the first entrance of a cold storage tank, and one is connected with the second entrance of No. two cold storage tanks, and this pipeline of two all adopts insulation pipe and has autocontrol valve above; First outlet bifurcation of a cold storage tank, one is connected with decompressor, and one export with second of No. two cold storage tanks and is connected, and this pipeline of two all adopts insulation pipe and has autocontrol valve above; The outlet of decompressor is connected with the channel of nitrogen entrance of BOG condensate recycling device, and pipeline adopts insulation pipe; The outlet bifurcation of the channel of nitrogen of BOG condensate recycling device, one is connected with the second entrance of a cold storage tank, and one is connected with the first entrance of No. two cold storage tanks, and this pipeline of two all adopts insulation pipe and has autocontrol valve above; First outlet bifurcation of No. two cold storage tanks, one export with second of a cold storage tank and is connected, and one is connected with the entrance of nitrogen storage tank, and this pipeline of two all adopts insulation pipe and has autocontrol valve above; The outlet of LNG storage tank is connected by pipeline with the entrance of the BOG gas channel of BOG condensate recycling device, and pipeline adopts insulation pipe and has autocontrol valve above; The outlet of BOG gas channel of BOG condensate recycling device is connected by pipeline with the entrance of LNG storage tank, and pipeline adopts insulation pipe.
BOG recovery method of the present invention, the nitrogen coming from nitrogen storage tank is compressed through double-screw compressor, nitrogen after compression enters expander after flowing through a cold storage tank (before having stored up cold in the precooling preparatory stage) cooling, enter BOG condensate recycling device and BOG gas after temperature reduces further to carry out heat exchange and make it liquefy, then the nitrogen that temperature raises to some extent flows through No. two cold storage tanks, temperature enters nitrogen storage tank after raising, and the process cycle before the nitrogen returned in nitrogen storage tank repeats uses.
Above-mentioned BOG recovery process flow process mainly comprises two stages, respectively:
One, prepare the precooling stage: above two cold storage tanks, all temperature inductor is housed, precooling is prepared when just starting, now do not pass into BOG gas in BOG condensate recycling device, nitrogen is only had to flow in whole tooling operation, when the temperature of No. two cold storage tanks is lower than-130 DEG C, the open and close of automatic control system autocontrol valve, realize two storage tanks and switch use, namely when the temperature of No. two cold storage tanks is lower than-130 DEG C, the open and close of automatic controlling system valve make No. two storage tanks be connected with the outlet of double-screw compressor, when now nitrogen flows through, temperature reduces, thus decrease the wasted work of decompressor.
Two, the treatment phase of operation: when No. two cold storage tank temperature are lower than-130 DEG C, now whole technological process just can start to carry out treatments B OG gas, the unlatching release BOG gas of automatic controlling system LNG storage tank pipeline upper valve passes into BOG condensate recycling device and low temperature nitrogen heat exchange, returns LNG storage tank by after BOG gas liquefaction.In running, as long as have the temperature of a cold storage tank lower than the open and close of automatic control system autocontrol valve when-130 DEG C, realize two storage tanks and switch use, repeat this process, nitrogen circulation can be made to utilize, decrease the waste of nitrogen purge, greatly reduce the input of fund and the loss of the energy.
Beneficial effect: the recovery process of BOG common on contrast market, this technological process is simple, decrease the use of some professional equipments such as BOG compressor, whole technological process apparatus is less, automatic control can be realized, nitrogen circulation can be made to utilize, decrease the waste of nitrogen purge, greatly reduce the input of fund, there is good commercial introduction and market application foreground.
Accompanying drawing explanation
Fig. 1 is the equipment flowsheet of the new and effective BOG reclaiming system of the present invention.
Fig. 2 is the pipeline import and export mix schematic diagram of cold storage tank of the present invention.
Embodiment
Below in conjunction with accompanying drawing and example, enforcement of the present invention is described further, but enforcement of the present invention and protection are not limited thereto.
The present embodiment describes a kind of new and effective, low energy consumption in detail and has recovery process and the device thereof of the BOG storing up cold function.This BOG reclaiming system obtains compressed nitrogen after being compressed by the nitrogen coming from nitrogen storage tank, flow through cold storage tank (before having stored up cold in the precooling preparatory stage) cooling again, temperature enters expander after reducing, enter BOG condensate recycling device and BOG gas after temperature reduces further to carry out heat exchange and make it liquefy, then flow through another cold storage tank, temperature finally enters nitrogen storage tank after raising.
As shown in Figure 1, the BOG reclaiming system of the present embodiment comprises nitrogen storage tank 1, common valve 2, double-screw compressor 3, the first control valve 4, second control valve 5, cold storage tank the 6, three control valve the 7, four control valve 8, decompressor 9, BOG condensate recycling device the 10, five control valve 11,6th No. 12, two, control valve cold storage tank the 13, seven control valve 14,8th control valve 15, LNG storage tank 16, the 9th control valve 17.Nitrogen storage tank 1 and LNG storage tank 16 are all equipped with pressure-detecting device, a cold storage tank 6 and No. two cold storage tanks 13 are all equipped with temperature sensing device.
The outlet of described nitrogen storage tank 1 is connected by pipeline with the entrance of double-screw compressor 3, with flowmeter and common valve above pipeline; The outlet bifurcation of double-screw compressor 3, one is connected with the first entrance of a cold storage tank 6, and one is connected with the second entrance of No. two cold storage tanks 13, and this pipeline of two all adopts insulation pipe and has autocontrol valve above; First outlet bifurcation of a cold storage tank 6, one is connected with decompressor 9, and one to export with second of No. two cold storage tanks 13 and is connected, and this pipeline of two all adopts insulation pipe and has autocontrol valve above; The outlet of decompressor 9 is connected with the channel of nitrogen entrance of BOG condensate recycling device 10, and pipeline adopts insulation pipe; The outlet bifurcation of the channel of nitrogen of BOG condensate recycling device 10, one is connected with the second entrance of a cold storage tank 6, and one is connected with the first entrance of No. two cold storage tanks 13, and this pipeline of two all adopts insulation pipe and has autocontrol valve above; First outlet bifurcation of No. two cold storage tanks 13, one export with second of a cold storage tank 6 and is connected, and one is connected with the entrance of nitrogen storage tank 1, and this pipeline of two all adopts insulation pipe and has autocontrol valve above; The outlet of LNG storage tank 16 is connected by pipeline with the entrance of the BOG gas channel of BOG condensate recycling device 10, and pipeline adopts insulation pipe and has autocontrol valve above; The outlet of the BOG gas channel of BOG condensate recycling device 10 is connected by pipeline with the entrance of LNG storage tank 16, and pipeline adopts insulation pipe.
Use above-mentioned BOG recovery process flow process, comprise the following steps:
1, in the preparation precooling stage, now BOG condensate recycling device 10 li does not also pass into BOG gas.The temperature of No. two cold storage tanks 13 is not lower than-130 DEG C, temperature inductor induction also signal transmission above No. two cold storage tanks 13, automatic controlling system first control valve the 4, the 3rd control valve 7, the 5th control valve 11, the 7th control valve 14 are opened, 8th control valve 15, the 6th control valve 12, the 4th control valve 8, second control valve 5 are closed, and open common valve 2; The nitrogen of normal temperature and pressure is exported by nitrogen storage tank 1, enters double-screw compressor 3 and compresses;
2, the compressed nitrogen obtained flows through the first control valve 4 and enters a cold storage tank 6 from the first entrance of a cold storage tank 6, then flows through the first outlet outflow of the 3rd control valve 7 from a cold storage tank 6, and pressure is substantially constant;
3, the nitrogen flowed out from a cold storage tank 6 is expanded by decompressor 9, and pressure reduces, and temperature also reduces further;
4, low temperature nitrogen enters BOG condensate recycling device 10, because now enter and nitrogen heat exchange without BOG gas, so nitrogen directly flows out from the outlet of BOG condensate recycling device 10 channel of nitrogen;
5, flow through the 5th control valve 11 from BOG condensate recycling device 10 nitrogen out and enter No. two cold storage tanks 13 from the first entrance of No. two cold storage tanks 13, flow through the 7th control valve 14 again to flow out from the first outlet of No. two cold storage tanks 13, pressure is substantially constant, finally enters nitrogen storage tank 1;
6, nitrogen circulation like this is run until the temperature of No. two cold storage tanks 13 is lower than-130 DEG C, temperature inductor induction also signal transmission, automatic control system controls the 8th control valve 15 automatically, 6th control valve 12, 4th control valve 8, second control valve 5 is opened, first control valve 4, 3rd control valve 7, 5th control valve 11, 7th control valve 14 is closed, nitrogen is exported by nitrogen storage tank 1, enter double-screw compressor 3, now automatic controlling system the 9th control valve 17 is opened LNG storage tank 16 and is discharged BOG gas, BOG gas enters BOG condensate recycling device 10, disposed of in its entirety technique brings into operation,
7, the compressed nitrogen obtained flows through the 8th control valve 15 and enters No. two cold storage tanks 13 from the second entrance of No. two cold storage tanks 13, then flows through the second outlet outflow of the 6th control valve 12 from No. two cold storage tanks 13, and temperature reduces, and pressure is substantially constant;
8, the low temperature nitrogen flowed out from No. two cold storage tanks 13 is expanded by decompressor 9, and pressure reduces, and temperature also reduces further;
9, low temperature nitrogen enters BOG condensate recycling device 10, carries out heat exchange make it liquefy with BOG gas, and the BOG gas of post liquefaction out flows back to LNG storage tank 16 from BOG condensate recycling device 10;
10, flow through the 4th control valve 8 from BOG condensate recycling device 10 nitrogen out and enter a cold storage tank 6 from the second entrance of a cold storage tank 6, then flow through the second control valve 5 and flow out from the second outlet of a cold storage tank 6, temperature unlifting pressure is substantially constant; Finally enter nitrogen storage tank 1;
11, the recovery that said method continuously carries out BOG gas is installed.
The technological scheme of the above embodiment; all can only think explanation of the present invention and the present invention can not be limited; claims indicate protection scope of the present invention; any change in the implication that claims of the present invention are suitable and scope; all belong in the scope of claims of the present invention, all should receive and respect and protection.
Claims (10)
1. one kind has the BOG reclaiming system of storing up cold function, comprise LNG storage tank, it is characterized in that: also comprise nitrogen storage tank, compressor, a cold storage tank, decompressor, BOG condensate recycling device, No. two cold storage tanks, the nitrogen coming from nitrogen storage tank is compressed through compressor, nitrogen after compression enters expander after flowing through a cold storage tank cooling, enter BOG condensate recycling device and BOG gas after temperature reduces further to carry out heat exchange and make it liquefy, then No. two cold storage tanks are flowed through, temperature raises and finally enters nitrogen storage tank, process cycle before nitrogen in nitrogen storage tank repeats uses.
2. BOG gas recovery system according to claim 1, is characterized in that: described compressor is double-screw compressor, and described decompressor is turbine radial expansion machine, and described BOG condensate recycling device is that micro passage is around heat exchange of heat pipe; The outlet of described nitrogen storage tank is connected by pipeline with the entrance of described double-screw compressor, with flowmeter and common valve above pipeline; The outlet bifurcation of described double-screw compressor, one is connected with the first entrance of a cold storage tank, and one is connected with the second entrance of No. two cold storage tanks, and this pipeline of two all adopts insulation pipe and has autocontrol valve above; First outlet bifurcation of a described cold storage tank, one is connected with described decompressor, and one export with second of No. two cold storage tanks and is connected, and this pipeline of two all adopts insulation pipe and has autocontrol valve above; The outlet of described decompressor is connected with the channel of nitrogen entrance of described BOG condensate recycling device, and pipeline adopts insulation pipe; The outlet bifurcation of the channel of nitrogen of described BOG condensate recycling device, one is connected with the second entrance of a described cold storage tank, one is connected with the first entrance of described No. two cold storage tanks, and this pipeline of two all adopts insulation pipe and has autocontrol valve above; First outlet bifurcation of described No. two cold storage tanks, one export with second of a described cold storage tank and is connected, and one is connected with the entrance of described nitrogen storage tank, and this pipeline of two all adopts insulation pipe and has autocontrol valve above; The outlet of described LNG storage tank is connected by pipeline with the entrance of the BOG gas channel of described BOG condensate recycling device, and pipeline adopts insulation pipe and has autocontrol valve above; The outlet of the BOG gas channel of described BOG condensate recycling device is connected by pipeline with the entrance of described LNG storage tank, and pipeline adopts insulation pipe.
3. BOG reclaiming system according to claim 1, it is characterized in that: system comprises necessary automatic control system and some auxiliary devices, described LNG storage tank is provided with pressure sensitive detection device, described pressure sensitive detection device detected pressures signal, when pressure reaches dangerous pressure, whole system is run automatically, automatic Open valve release BOG gas when by the time one of them cold storage tank temperature reaches requirement, and whole BOG recovery process is started working; Described cold storage tank is provided with temperature inductor, and described temperature inductor receives transmission of signal, when arbitrary cold storage tank temperature is lower than the open and close of autocontrol valve when-130 DEG C, and then realizes two cold storage tanks switching uses.
4. BOG reclaiming system according to claim 1, is characterized in that: described cold storage tank is the tank body of band thermal insulation layer bilayer, and the specific cobble of size such as to be full of inside tank body, the outlet temperature of cold storage tank is determined according to the size of yield.
5. according to the BOG reclaiming system one of Claims 1-4 Suo Shu, it is characterized in that: adapter, the valve of each device and each equipment all carry out isothermal holding.
6. there is the BOG recovery method storing up cold function, first build the described BOG reclaiming system of one of claim 1 to 5, it is characterized in that: described BOG recovery method comprises two stages, respectively:
Prepare the precooling stage: above two cold storage tanks, all temperature inductor is housed, precooling is prepared when just starting, now do not pass into BOG gas in BOG condensate recycling device, nitrogen is only had to flow in BOG reclaiming system operation, only have when the temperature of No. two cold storage tanks is lower than setting temperature, the open and close of automatic control system ability control valve make No. two storage tanks be connected with the outlet of double-screw compressor, realize two storage tanks and switch use;
The treatment phase of operation: when No. two cold storage tank temperature are lower than setting temperature, now BOG reclaiming system starts to carry out treatments B OG gas, the unlatching release BOG gas of automatic controlling system LNG storage tank pipeline upper valve passes into BOG condensate recycling device and low temperature nitrogen heat exchange, returns LNG storage tank by after BOG gas liquefaction.
7. BOG recovery method according to claim 6, it is characterized in that: in running, setting temperature is-130 DEG C, as long as when having the temperature of a cold storage tank lower than-130 DEG C, the open and close of automatic control system autocontrol valve, realize two storage tanks and switch use, repeat this process, nitrogen circulation is utilized.
8. BOG recovery method according to claim 6, it is characterized in that: the nitrogen coming from nitrogen storage tank compresses through double-screw compressor, nitrogen after compression enters expander after flowing through a cold storage tank cooling, enter BOG condensate recycling device and BOG gas after temperature reduces further to carry out heat exchange and make it liquefy, then the nitrogen that temperature raises to some extent flows through No. two cold storage tanks, temperature enters nitrogen storage tank after raising, and the process cycle before the nitrogen returned in nitrogen storage tank repeats uses.
9., according to the BOG recovery method one of claim 6 to 8 Suo Shu, it is characterized in that:
Step one, preparation the precooling stage, now also do not pass into BOG gas in BOG condensate recycling device, the temperature of No. two cold storage tanks is not lower than-130 DEG C, temperature inductor induction also signal transmission above No. two cold storage tanks, the corresponding control valve of automatic controlling system is opened, and controls corresponding control valve and closes; The nitrogen of normal temperature and pressure is exported by nitrogen storage tank, enters double-screw compressor and compresses;
Step 2, the compressed nitrogen obtained flow through control valve and enter a cold storage tank from the first entrance of a cold storage tank, then flow out from the first outlet of a cold storage tank, and pressure is substantially constant;
Step 3, the nitrogen that flows out from cold storage tank are by expander, and pressure reduces, and temperature reduces further; Step 4, low temperature nitrogen enter BOG condensate recycling device, because now entering and nitrogen heat exchange without BOG gas, so nitrogen directly flows out from the outlet of BOG condensate recycling device channel of nitrogen;
Step 5, flow through control valve enter No. two cold storage tanks from the first entrance of No. two cold storage tanks from BOG condensate recycling device nitrogen out, then flow out from the first outlet of No. two cold storage tanks, pressure is substantially constant, finally enters nitrogen storage tank;
Step 6, so nitrogen circulation are run until the temperature of No. two cold storage tanks is lower than-130 DEG C, temperature inductor induction also signal transmission, the corresponding control valve of automatic controlling system is opened, control corresponding control valve to close, nitrogen is exported by nitrogen storage tank, enters double-screw compressor, and now automatic controlling system opens LNG storage tank release BOG gas, BOG gas enters BOG condensate recycling device, and disposed of in its entirety technique brings into operation; Step 7, the compressed nitrogen obtained flow through and control to enter No. two cold storage tanks from the second entrance of No. two cold storage tanks, then flow out from the second outlet of No. two cold storage tanks, and temperature reduces, and pressure is substantially constant;
Step 8, the low temperature nitrogen that flows out from No. two cold storage tanks are by expander, and pressure reduces, and temperature reduces further;
Step 9, low temperature nitrogen enter BOG condensate recycling device, carry out heat exchange make it liquefy with BOG gas, and the BOG gas of post liquefaction out flows back to LNG storage tank from BOG condensate recycling device;
Step 10, to flow through enter a cold storage tank from the second entrance of a cold storage tank from BOG condensate recycling device nitrogen out, then the second outlet flowing through a cold storage tank is flowed out, temperature unlifting pressure is substantially constant; Finally enter nitrogen storage tank.
10. BOG recovery method according to claim 9, is characterized in that: described method continuously carries out the recovery of BOG gas.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105864636A (en) * | 2016-05-23 | 2016-08-17 | 唐山市新概念科技有限公司 | Pump-free unloading, refueling and filling systems and pump-free filling technology of LNG refueling station |
| CN108036194A (en) * | 2017-10-20 | 2018-05-15 | 中海浙江宁波液化天然气有限公司 | Precooling technique before low pressure LNG manifold for the second stage of tank car system fills |
| CN109646984A (en) * | 2019-01-17 | 2019-04-19 | 南京工业大学 | A kind of VOCs multistage cooling recovery system having cold storage function |
| CN111156418A (en) * | 2018-11-08 | 2020-05-15 | 中国石油化工股份有限公司 | Recovery system for liquefied hydrocarbons |
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