CN104295889B - LNG receiving stations terminal boil-off gas recovery system - Google Patents
LNG receiving stations terminal boil-off gas recovery system Download PDFInfo
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- CN104295889B CN104295889B CN201410558532.7A CN201410558532A CN104295889B CN 104295889 B CN104295889 B CN 104295889B CN 201410558532 A CN201410558532 A CN 201410558532A CN 104295889 B CN104295889 B CN 104295889B
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Abstract
The invention discloses a kind of LNG receiving stations terminal boil-off gas recovery system.LNG receiving stations terminal includes a LNG storage tank；One BOG low pressure compressors or air blower are connected with the LNG storage tank, for being compressed to the boil-off gas produced in the LNG storage tank；The BOG low pressure compressors or the air blower are connected with BOG/LNG heat exchangers；The high pressure LNG export pipelines of the BOG/LNG heat exchangers are connected with LNG gasification device, and the low pressure LNG export pipelines of the BOG/LNG heat exchangers are connected with the LNG storage tank；The LNG storage tank is connected with a LNG feed-lines, and the LNG feed-lines are provided with low-lift pump and/or high-pressure pump, and the output end of the LNG feed-lines is connected with the BOG/LNG heat exchangers.The boil-off gas that the present invention is produced using the cold of high-pressure liquefaction natural gas (being usually 7MPaG~10MPaG) with receiving station is exchanged heat in heat exchanger, and boil-off gas is condensed into liquefied natural gas, is finally recycled in LNG tank.
Description
Technical field
The present invention relates to a kind of LNG receiving stations terminal boil-off gas recovery system, belong to liquefied natural gas field.
Background technology
With the fast development in China's natural gas market, natural gas ratio shared in energy supply increases sharply, day
The insufficient contradiction of right gas is more and more obvious.Liquefied natural gas (hereinafter referred to as " LNG ") yield is just with every year about 12% height
Speed increases, and as one of most swift and violent energy industry is increased, LNG receiving stations have also started construction upsurge.
LNG receiving stations can produce boil-off gas (hereinafter referred to as " BOG "), general LNG receiving stations due to the introducing of external heat
BOG processing mode have directly output and condense two kinds again.Direct output method is to be compressed to boil-off gas after outer defeated pressure directly
Pick to gas line network；And condensation method is that boil-off gas is compressed into certain pressure (being usually 0.6MPaG-1MPaG) again, with by
LNG low-pressure deliveries pump is mixed from the LNG that LNG storage tank is sent out in after-condenser., can due to being in supercooled state after LNG pressurizations
So that boil-off gas is condensed again, condensed LNG is outer defeated after being pressurizeed through LNG high-pressure delivery pumps.Condensation method can utilize LNG portion again
Divide cold, energy is saved to a certain extent.But what traditional condensation method again was utilized be LNG receiving stations low pressure stage (generally
For 0.6MPaG~1MPaG) cold, and BOG need by compressor be pressurized to above-mentioned pressure could with LNG condensations by contact, therefore
One side BOG compressions need larger Energy input, and the high pressure section on the other hand not utilizing LNG receiving stations (is usually 7MPaG
~10MPaG) bigger supercooling cold.
The content of the invention
It is an object of the invention to provide a kind of LNG receiving stations terminal boil-off gas recovery system, boil-off gas of the present invention is reclaimed
The boil-off gas that system is produced using the cold of high-pressure liquefaction natural gas with receiving station is exchanged heat in heat exchanger, will evaporate air cooling
Liquefied natural gas is congealed into, is recovered in LNG tank.
LNG receiving stations terminal boil-off gas recovery system provided by the present invention, wherein LNG receiving stations terminal includes
One LNG storage tank；One BOG low pressure compressors or air blower are connected with the LNG storage tank, for being produced in the LNG storage tank
Boil-off gas be compressed；The BOG low pressure compressors or the air blower are connected with BOG/LNG heat exchangers；The BOG/
The high pressure LNG export pipelines of LNG heat exchangers are connected with LNG gasification device, the low pressure LNG efferent ducts of the BOG/LNG heat exchangers
Line is connected with the LNG storage tank；
The LNG storage tank is connected with a LNG feed-lines, and the LNG feed-lines are provided with low-lift pump and/or high pressure
Pump, the output end of the LNG feed-lines is connected with the BOG/LNG heat exchangers.
In described evaporation gas recycling system, the BOG/LNG heat exchangers are shell-and-tube heat exchanger or plate type heat exchanger.
In described evaporation gas recycling system, the BOG/LNG heat exchangers are shell-and-tube heat exchanger, and the BOG low pressure
Compressor or the air blower are connected with the shell side of the shell-and-tube heat exchanger, the LNG feed-lines and the shell-and-tube
The tube side of heat exchanger is connected.
In boil-off gas recovery system of the present invention, the LNG storage tank of LNG receiving stations terminal, for storing by outer
Boundary transports the LNG of coming, while the BOG that general LNG receives the main process system generation of yard is aggregated into LNG storage tank, in addition originally
BOG, which is condensed into after LNG, in invention recovery system is finally recycled in the LNG storage tank.
In boil-off gas recovery system of the present invention, the BOG low pressure compressors or the air blower, for providing pressure
Can, allow the BOG produced in the LNG storage tank to enter in the BOG/LNG heat exchangers to be exchanged heat.
In boil-off gas recovery system of the present invention, the pressure charging system for LNG is typically made up of low-lift pump and high-pressure pump,
Low-lift pump or high-pressure pump can only be included, its act on be will LNG pressurizations it is outer defeated, can be to the BOG/ in recovery system of the present invention
LNG heat exchangers provide the LNG colds of supercooling, for the BOG that condenses, liquefies.
In boil-off gas recovery system of the present invention, the high pressure LNG of BOG/LNG heat exchangers output and through the high pressure
The LNG of pump supercharging, is delivered to after finally converging in the LNG gasification device；Gasify in the LNG gasification device to more than 0 DEG C, lead to
Downstream user is transported to outside piping.Heretofore described LNG gasification device can using traditional open-frame type gasifier or other be adapted to
The heat exchanger of form.
LNG receiving stations terminal boil-off gas recovery system of the present invention has the following advantages that：
The evaporation that the present invention is produced using the cold of high-pressure liquefaction natural gas (being usually 7MPaG~10MPaG) with receiving station
Gas is exchanged heat in heat exchanger, and boil-off gas is condensed into liquefied natural gas, is finally recycled in LNG tank.This hair
Bright evaporation gas recycling system both make use of high pressure LNG supercooling cold at utmost sharply, also greatly reduce BOG compressors
Energy expenditure, is a kind of novel energy-conservation consumption lowering recovery system.
Brief description of the drawings
Fig. 1 is the schematic diagram of LNG receiving stations terminal boil-off gas recovery system of the present invention.
Each mark is as follows in figure：
1LNG storage tanks, 2LNG low-lift pumps, 3LNG high-pressure pumps, 4 pressure regulator valves, 5BOG low pressure compressors, 6BOG/LNG heat exchangers,
7LNG gasifiers.
Embodiment
The present invention will be further described below in conjunction with the accompanying drawings, but the invention is not limited in following examples.
As shown in figure 1, being the schematic diagram of LNG receiving stations terminal boil-off gas recovery system of the present invention, wherein LNG receiving stations
Terminal includes a LNG storage tank 1.BOG low pressure compressors 5 are connected with LNG storage tank 1, for the BOG to being produced in LNG storage tank 1
It is compressed.The port of export of BOG low pressure compressors 5 is connected with BOG/LNG heat exchangers 6, for the BOG after supercharging to be delivered to
Exchanged heat in BOG/LNG heat exchangers 6.The high pressure LNG export pipelines of the BOG/LNG heat exchangers 6 are connected with LNG gasification device 7,
By transporting to downstream user outside pipeline after gasification；The low pressure LNG export pipelines of the BOG/LNG heat exchangers 6 and the phase of LNG storage tank 1
Connection, for low pressure LNG to be delivered in LNG storage tank 1.In order to provide cold for BOG, LNG storage tank 1 and a LNG are conveyed
Pipeline is connected, and sets on the LNG feed-lines LNG low-lift pumps 2 and LNG high-pressure pumps 3, by LNG pressurizeed outside transport to
In BOG/LNG heat exchangers 6.In BOG/LNG heat exchangers 6, high pressure LNG and BOG is exchanged heat, and cold is provided for BOG, after heat exchange
BOG become LNG, be back to by low pressure LNG export pipelines in LNG storage tank 1.
In evaporation gas recycling system of the present invention, BOG/LNG heat exchangers 6 can be shell-and-tube heat exchanger or plate type heat exchanger, when
When selecting shell-and-tube heat exchanger, BOG low pressure compressors 5 are connected with its shell side, LNG feed-lines are connected with its tube side
It is logical.
The course of work of evaporation gas recycling system of the present invention is as follows：
Substantial amounts of BOG gases are produced because external heat introduces LNG storage tank 1, the BOG low pressure of low pressure is entered through house steward BOG
Compressor 5, inlet pressure is 18KPaG, and outlet pressure is 0.2MPaG after pressurization, and enters BOG/LNG heat exchangers 6
In.
LNG in LNG storage tank 1 is pumped out by LNG low-lift pumps 2, is delivered to through defeated house steward outside low pressure in LNG high-pressure pumps 3, LNG
The outlet pressure of low-lift pump 2 is 1.0MPaG, and the outlet pressure of LNG high-pressure pumps 3 is 10.0MPaG, and high pressure LNG enters as low-temperature receiver
In BOG/LNG heat exchangers 6.
High pressure LNG is exchanged heat with the BOG after compression in BOG/LNG heat exchangers 6, and the BOG after heat exchange becomes LNG returns
In LNG storage tank 1, the outlet of BOG/LNG heat exchangers 6 LNG pressure is 0.15MpaG；BOG/LNG heat exchangers 6 export high pressure LNG pressure
For 9MPaG, the completion of LNG gasification device 7 gasification is mixed into and outer defeated with the LNG after being depressured by pressure regulator valve 4, outside gas should
This is heated to more than 0 DEG C and enters steam line.
Claims (1)
1. a kind of LNG receiving stations terminal boil-off gas recovery system, LNG receiving stations terminal includes a LNG storage tank；Its feature
It is：One BOG low pressure compressors or air blower are connected with the LNG storage tank, for the evaporation to being produced in the LNG storage tank
Gas is compressed；The BOG low pressure compressors or the air blower are connected with BOG/LNG heat exchangers；The BOG/LNG heat exchange
The high pressure LNG export pipelines of device are connected with LNG gasification device, the low pressure LNG export pipelines of the BOG/LNG heat exchangers with it is described
LNG storage tank is connected；
The LNG storage tank is connected with a LNG feed-lines, and the LNG feed-lines are provided with low-lift pump and high-pressure pump, described
LNG in LNG storage tank is pumped out by the low-lift pump, is delivered to through the LNG feed-lines in the high-pressure pump, the high-pressure pump
Outlet pressure be 10.0MPaG, obtained high pressure LNG as low-temperature receiver enter the BOG/LNG heat exchangers in；
The outlet of the high-pressure pump is with connecting a pipeline between the outlet of the BOG/LNG heat exchangers, the pipeline is provided with tune
Pressure valve；
The BOG/LNG heat exchangers are shell-and-tube heat exchanger, and the BOG low pressure compressors or the air blower and the shell
The shell side of formula heat exchanger is connected, and the LNG feed-lines are connected with the tube side of the shell-and-tube heat exchanger.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410558532.7A CN104295889B (en) | 2014-10-20 | 2014-10-20 | LNG receiving stations terminal boil-off gas recovery system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410558532.7A CN104295889B (en) | 2014-10-20 | 2014-10-20 | LNG receiving stations terminal boil-off gas recovery system |
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| CN104295889A CN104295889A (en) | 2015-01-21 |
| CN104295889B true CN104295889B (en) | 2017-09-22 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104791602B (en) * | 2015-04-27 | 2018-06-05 | 武汉交圣新能源工程有限公司 | The LNG gaseous fuels air supply method and device that BOG is preferentially utilized |
| CN107504368A (en) * | 2017-09-14 | 2017-12-22 | 江苏航天惠利特环保科技有限公司 | A kind of energy-efficient bog retracting devices |
| CN108518581A (en) * | 2018-06-06 | 2018-09-11 | 张家港艾普能源装备有限公司 | LNG storage tank BOG recovery systems |
| CN109595458B (en) * | 2019-01-04 | 2020-08-04 | 舟山市祥睿船舶科技开发有限责任公司 | BOG recovery unit based on L NG storage tank |
| CN113324167B (en) * | 2021-05-19 | 2022-12-23 | 上海汇舸环保科技有限公司 | Ship LNG engine gas supply system |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP5737894B2 (en) * | 2010-09-30 | 2015-06-17 | 三菱重工業株式会社 | Boil-off gas reliquefaction equipment |
| KR101422224B1 (en) * | 2012-05-09 | 2014-07-22 | 삼성중공업 주식회사 | Lng regasification system and method |
| CN203641874U (en) * | 2013-12-19 | 2014-06-11 | 中国五环工程有限公司 | Boil-off gas pressurized unloading device for liquefied natural gas (LNG) satellite station |
| CN203731088U (en) * | 2013-12-26 | 2014-07-23 | 新地能源工程技术有限公司 | LNG receiving station process system for recovering BOG based on normal temperature compressor |
| CN104033727A (en) * | 2014-06-27 | 2014-09-10 | 中国海洋石油总公司 | Technique and device for treating BOG by using recycled cold energy at LNG receiving station |
| CN204127652U (en) * | 2014-10-20 | 2015-01-28 | 中国海洋石油总公司 | A kind of LNG receiving station terminal boil-off gas reclaiming system |
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Address after: 100010 Chaoyangmen North Street, Dongcheng District, Dongcheng District, Beijing Co-patentee after: CNOOC Gas & Power Group Patentee after: China Offshore Oil Group Co., Ltd. Address before: 100010 Chaoyangmen North Street, Dongcheng District, Dongcheng District, Beijing Co-patentee before: CNOOC Gas & Power Group Patentee before: China National Offshore Oil Corporation |
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