CN203641874U - Boil-off gas pressurized unloading device for liquefied natural gas (LNG) satellite station - Google Patents
Boil-off gas pressurized unloading device for liquefied natural gas (LNG) satellite station Download PDFInfo
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- CN203641874U CN203641874U CN201320842571.0U CN201320842571U CN203641874U CN 203641874 U CN203641874 U CN 203641874U CN 201320842571 U CN201320842571 U CN 201320842571U CN 203641874 U CN203641874 U CN 203641874U
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- Prior art keywords
- lng
- bog
- storage tank
- gas
- boil
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- 239000007789 gas Substances 0.000 title claims abstract description 43
- 239000003949 liquefied natural gas Substances 0.000 title abstract 13
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000003345 natural gas Substances 0.000 claims abstract description 13
- 239000007788 liquid Substances 0.000 claims description 3
- 238000002309 gasification Methods 0.000 abstract description 7
- 239000012071 phase Substances 0.000 description 8
- 238000001816 cooling Methods 0.000 description 4
- 239000006200 vaporizer Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000003139 buffering effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000012946 outsourcing Methods 0.000 description 1
- 230000005501 phase interface Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
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- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The utility model relates to a boil-off gas (BOG) pressurized unloading device for a liquefied natural gas (LNG) satellite station. The problem that the conventional pressurized unloading device is large in LNG gasification loss and long in unloading time is solved. According to the technical scheme, LNG loaded in an LNG tank car is fed into an LNG storage tank for storage through an LNG unloading arm connected through a pipeline; the BOG in the LNG storage tank is fed into a natural gas pipe network through a BOG air temperature recuperator, a BOG buffer tank, a BOG compressor set and a natural gas storage tank which are connected through pipelines; a BOG outlet of the LNG storage tank is connected with the BOG air temperature recuperator through a pipe side or a shell side of a BOG heat exchanger; during unloading, pressurized BOG exhausted from an outlet of the natural gas storage tank is connected with an NG gas phase arm through the shell side or pipe side of the BOG heat exchanger and the BOG storage tank so as to realize pressurized unloading. The pressurized unloading device is simple in structure, safe and reliable and can be simply transformed by utilizing the original equipment, the LNG loss is low, and the continuous and large-scale LNG unloading requirements can be met.
Description
Technical field
The utility model relates to a kind of LNG unloading unit, specifically boil-off gas supercharging unloading unit for a kind of LNG satellite station.
Background technique
In LNG satellite station, more options adopt LNG tank car outsourcing LNG resource to input in LNG storage tank and store, and for the safe smoothly LNG by LNG tank car is discharged in LNG storage tank, need to be equipped with LNG unloading unit.Traditional LNG unloading unit adopts and unloads from supercharging, is introduced into air temperature type from the gasification of supercharging vaporizer by a small amount of LNG in LNG tank car, then returns and delivers to supercharging in LNG tank car, realizes LNG in tank car through the LNG object that arm draws off of unloading.Tradition not only needs to increase the equipment such as corresponding vaporizer from supercharging unloading unit, and loss is large, the time of unloading is long, air temperature type thaws the shortcomings such as defrosting from supercharging vaporizer, the requirement of can not meet continuously, LNG unloading on a large scale also to exist LNG to gasify.
Summary of the invention
The purpose of this utility model is in order to solve the problems of the technologies described above, provide a kind of simple in structure, can utilize that original equipment is simply transformed, LNG loss is little, can meet continuously, extensive LNG unloads the LNG satellite station boil-off gas supercharging unloading unit requiring.
Technological scheme comprises LNG storage tank, the liquid entering hole of described LNG storage tank is connected through pipeline and the LNG arm of unloading, the boil-off gas outlet of LNG storage tank is connected with the empty warm recuperator of BOG, BOG knock out drum, BOG compressor bank and natural gas storage tank successively through pipeline, and the boil-off gas outlet of described LNG storage tank is connected with the empty warm recuperator of BOG through pipe side or the shell-side of BOG heat exchanger; The boil-off gas outlet of described natural gas storage tank is connected with NG gas phase arm through the shell-side of BOG heat exchanger or pipe side, BOG storage tank.
The shell-side of described BOG heat exchanger or pipe side are connected with BOG storage tank through reduction valve.
Described BOG storage tank is connected with NG gas phase arm through pressure maintaining valve.
Can produce a certain amount of boil-off gas (BOG) because of factors such as amount of heat inputs by the LNG storing in LNG storage tank, in order to prevent LNG storage tank superpressure, these boil-off gas can be processed by BOG processing system, claimant considers in the time unloading part through BOG processing system boil-off gas after treatment and boil-off gas heat exchange in BOG heat exchanger of being drawn by LNG storage tank, reclaims after cold through BOG storage tank again and is back to LNG tank car and carries out unloading from supercharging to substitute the empty temperature vaporizer of the original employing LNG that gasifies in a small amount of tank car in NG gas phase arm input LNG tank car.Because boil-off gas is from former BOG processing system, without increasing separately equipment for gasification, thereby reduce equipment investment, also reduce the gasification loss of LNG.By BOG heat exchanger, make the boil-off gas cooling of reuse, be conducive to reduce the gasification loss that causes LNG in LNG tank car because of external heat input, further, also can, by the cooling of further reducing pressure of the boil-off gas after reduction valve heat exchanging cooling, be down to-130 ℃ of left and right, further reduce the gasification of LNG in LNG tank car and lose, and by pressure maintaining valve to entering the further voltage stabilizing of boil-off gas of NG gas phase arm, guarantee to unload the safety and stability of process LNG tank car pressure.
The utility model is simple in structure, operation control easy, equipment investment is low, safety reliability is high, LNG loss is little, can meet continuously, extensive LNG unloads requirement.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of boil-off gas supercharging unloading unit of the present utility model.
Wherein, the Z01-LNG arm of unloading, Z02-NG gas phase arm, T01-LNG storage tank, T02-BOG storage tank, S01-BOG knock out drum, S02-natural gas storage tank, E01-BOG heat exchanger, the empty warm recuperator of E02-BOG, K01-BOG compressor bank, PV01-reduction valve, PV02-pressure maintaining valve, FV01-LNG Flow valve.
Embodiment
Below in conjunction with accompanying drawing, this practicality is further explained to explanation:
With reference to Fig. 1, the LNG liquid entering hole of arm Z01 through pipeline connection traffic valve FV01, LNG storage tank T01 of unloading; The boil-off gas outlet of described LNG storage tank connects the empty warm recuperator E02 of pipe side (shell-side), BOG, BOG knock out drum S01, BOG compressor bank K01 and the natural gas storage tank S02 of BOG heat exchanger E01 through pipeline, the boil-off gas outlet of natural gas storage tank S02 is connected with NG gas phase arm Z02 through shell-side (pipe side), reduction valve PV01, BOG storage tank T02, the pressure maintaining valve PV02 of BOG heat exchanger E01.
Working principle:
During non-unloading, the boil-off gas that in LNG storage tank T01, storage LNG produces because of factors such as amount of heat inputs is sent into the empty warm device E02 re-heat of BOG to normal temperature after the boil-off gas outlet of LNG storage tank T01 enters the heat exchange of BOG heat exchanger E01 pipe side again, after BOG knock out drum S01 buffering, entering BOG compressor K01 is again pressurized to after 3.5MPaG, after natural gas storage tank S02, input to again mesohigh gas distributing system, BOG compressor K01 sends into superpressure part BOG compression in natural gas storage tank S02 continuously, to maintain LNG storage tank T01 in low-voltage safety state.In the time that needs are unloaded, extract the part boil-off gas storing in natural gas storage tank S02 the shell-side of a stock-traders' know-how BOG heat exchanger E01 out and be cooled to-80 ℃ of left and right with the boil-off gas heat exchange recovery cold from LNG storage tank, then about reduction valve PV01 reduces to low pressure 0.7MPaG, deliver to storage in BOG storage tank T02 and unload for subsequent use.This decompression process is throttling expansion, and cooling rear boil-off gas temperature is further reduced to-130 ℃.Supercharging is conducive to reduce and causes LNG gasification loss in tank car because of external heat input to LNG tank car to utilize low-temperature evaporation gas.
During unloading, LNG unloading arm Z01 is connected with the gentle interfaces of liquid phase interface on LNG tank car respectively with NG gas phase arm Z02.Control by LNG Flow valve FV01 the speed of unloading, boil-off gas in BOG storage tank T02 is through pressure maintaining valve PV02 input LNG tank car gas-phase space, to stablize the pressure of unloading of LNG tank car, LNG in tank car is pressed into LNG storage tank T01 to the object of unloading to realize boil-off gas supercharging.
Claims (3)
1. a boil-off gas supercharging unloading unit for LNG satellite station, comprise LNG storage tank, the liquid entering hole of described LNG storage tank is connected through pipeline and the LNG arm of unloading, the boil-off gas outlet of LNG storage tank is connected with the empty warm recuperator of BOG, BOG knock out drum, BOG compressor bank and natural gas storage tank successively through pipeline, it is characterized in that, the boil-off gas outlet of described LNG storage tank is connected with the empty warm recuperator of BOG through pipe side or the shell-side of BOG heat exchanger; The BOG outlet of described natural gas storage tank is connected with NG gas phase arm through the shell-side of BOG heat exchanger or pipe side, BOG storage tank.
2. boil-off gas supercharging unloading unit for LNG as claimed in claim 1 satellite station, is characterized in that, the shell-side of described BOG heat exchanger or pipe side are connected with BOG storage tank through reduction valve.
3. boil-off gas supercharging unloading unit for LNG as claimed in claim 1 or 2 satellite station, is characterized in that, described BOG storage tank is connected with NG gas phase arm through pressure maintaining valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320842571.0U CN203641874U (en) | 2013-12-19 | 2013-12-19 | Boil-off gas pressurized unloading device for liquefied natural gas (LNG) satellite station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320842571.0U CN203641874U (en) | 2013-12-19 | 2013-12-19 | Boil-off gas pressurized unloading device for liquefied natural gas (LNG) satellite station |
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| Publication Number | Publication Date |
|---|---|
| CN203641874U true CN203641874U (en) | 2014-06-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320842571.0U Expired - Lifetime CN203641874U (en) | 2013-12-19 | 2013-12-19 | Boil-off gas pressurized unloading device for liquefied natural gas (LNG) satellite station |
Country Status (1)
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| CN (1) | CN203641874U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104295889A (en) * | 2014-10-20 | 2015-01-21 | 中国海洋石油总公司 | Vaporized gas recovery system of LNG (Liquid Natural Gas) receiving station terminal |
| CN105135208A (en) * | 2015-08-20 | 2015-12-09 | 中国石油大学(北京) | Compression recycling method for evaporation gas of liquefied natural gas |
| CN108150827A (en) * | 2018-02-07 | 2018-06-12 | 贝利智能装备（张家港）有限公司 | A kind of LNG tank vehicle is unloaded method |
-
2013
- 2013-12-19 CN CN201320842571.0U patent/CN203641874U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104295889A (en) * | 2014-10-20 | 2015-01-21 | 中国海洋石油总公司 | Vaporized gas recovery system of LNG (Liquid Natural Gas) receiving station terminal |
| CN105135208A (en) * | 2015-08-20 | 2015-12-09 | 中国石油大学(北京) | Compression recycling method for evaporation gas of liquefied natural gas |
| CN108150827A (en) * | 2018-02-07 | 2018-06-12 | 贝利智能装备（张家港）有限公司 | A kind of LNG tank vehicle is unloaded method |
| CN108150827B (en) * | 2018-02-07 | 2019-10-15 | 贝利智能装备（张家港）有限公司 | A kind of LNG tank vehicle is unloaded method |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140611 |
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| CX01 | Expiry of patent term |