CN105135211B - A kind of BOG condensate recovery systems and method for LNG gas stations - Google Patents
A kind of BOG condensate recovery systems and method for LNG gas stations Download PDFInfo
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- CN105135211B CN105135211B CN201510527627.7A CN201510527627A CN105135211B CN 105135211 B CN105135211 B CN 105135211B CN 201510527627 A CN201510527627 A CN 201510527627A CN 105135211 B CN105135211 B CN 105135211B
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Abstract
The invention discloses a kind of BOG condensate recovery systems for LNG gas stations, immersed pump（3）Feed tube LNG storage tank is connected by pipeline（1）Discharging tube, immersed pump（3）Discharging tube pass through pipeline connect filling machine, immersed pump（3）Discharging tube also pass through pipeline connect BOG condensation recovering devices（2）Heat source passages import, BOG condensation recovering devices（2）Heat source passages outlet LNG storage tank is connected by pipeline（1）, BOG condensation recovering devices（2）Low-temperature receiver channel entrance pass through pipeline connect liquid nitrogen storage device（4）Discharging tube, BOG condensation recovering devices（2）Low-temperature receiver channel outlet connection nitrogen blow-down pipe, also disclose reclaim BOG method.The beneficial effects of the invention are as follows：Cost is reduced, and the BOG gases in storage tank realize zero-emission, have both saved the energy, it also avoid the pollution to environment.
Description
Technical field
The present invention relates to BOG gas recovery techniques field, in particular it relates to which a kind of BOG for LNG gas stations is condensed back
Receive system and method.
Background technology
LNG（Liquefied natural gas）It is a kind of clean energy resource.With LNG fuel automobiles（Ship）, town dweller's combustion gas, boiler
The progressively extensive use of the field such as combustion gas and fuel gas generation, ceramic post sintering, in recent years LNG consumption requirements amount rapid growth be just presented becoming
Gesture.Mainly there are two parts, i.e., usually said " land gas " in LNG source（The LNG of land LNG liquefaction plants production, typically leads to
Cross the transport of LNG transport vehicles）, " extra large gas "（Overseas LNG, LNG is transported to land LNG receive typically by Large LNG cargo ship
Stand and store）.The condensing temperatures of LNG at ambient pressure are about -162 DEG C, although LNG warehousing and transportation facilities or LNG conveyance conduits are taken
Good cold insulation safeguard measure, but because it has the very big temperature difference between environment, LNG is in storage, transportation
Heat absorption evaporation is constantly present, BOG（LNG absorbs heat the gas of evaporation naturally during storage, transport etc.）Generation it is inevitable.
LNG is continuously increased with caloric receptivity, and BOG yield can gradually increase, and LNG accumulatings pressure consequently also can constantly rise, this
If in the case of do not take effective decompression measure, for avoid causing superpressure safety etc. accident, when LNG accumulating pressure reaches a level pressure
During power, typically release can be carried out by diffusing mode automatic or manual to air, diffusing for BOG can cause environmental pollution, the energy
Waste and economic loss.Therefore, the problem of BOG recycling is become to need to solve in LNG application projects.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of zero-emission, both save the energy, also avoid the dirt to environment
The BOG condensate recovery systems and method for LNG gas stations of dye.
The present invention the used technical scheme that solves the above problems is：
A kind of BOG condensate recovery systems for LNG gas stations, including LNG storage tank, BOG condensation recovering devices, immersed pump and
Liquid nitrogen storage device, the feed tube of immersed pump connects the discharging tube of LNG storage tank by pipeline, and the discharging tube of immersed pump passes through pipeline
Filling machine is connected, the discharging tube of immersed pump also connects the heat source passages import of BOG condensation recovering devices by pipeline, and BOG is condensed back
The heat source passages outlet for receiving device connects LNG storage tank by pipeline, and the low-temperature receiver channel entrance of BOG condensation recovering devices is connected by pipeline
The discharging tube of liquid nitrogen storage device, the low-temperature receiver channel outlet connection nitrogen blow-down pipe of BOG condensation recovering devices.
The present invention uses liquid nitrogen and LNG and completes liquid liquid heat exchange in BOG reclaims condenser, and advantage is heat exchanger face
It is able to can greatly reduce, disposable input cost reduction, the BOG gases in storage tank also achieve zero-emission, have both saved the energy,
Avoid the pollution to environment.
It is preferred that, described recovery system also includes being provided for detection LNG storages in control system, described LNG storage tank
It is provided for detecting the temperature-detecting device A of LNG fluid temperatures in storage tank in the pressure-detecting device A of pressure tank, LNG storage tank,
It is provided with the heat source passages outlet of connection BOG condensation recovering devices and the pipeline of LNG storage tank for detecting LNG liquid temperature in pipeline
Set on the temperature-detecting device B of degree, the pipeline for the heat source passages import for connecting the discharging tube and BOG condensation recovering devices of immersed pump
There is stop valve, connect the discharging tube of liquid nitrogen storage device with being provided with the pipeline of the low-temperature receiver channel entrance of BOG condensation recovering devices
Regulating valve, pressure-detecting device A, temperature-detecting device A, temperature-detecting device B, stop valve and regulating valve connect with control system
Connect, remote control can be realized by control system.It is higher than setting when temperature-detecting device A detects LNG fluid temperatures in storage tank
During value, or when pressure-detecting device A detects LNG storage tank pressure higher than setting value, stop valve is controlled to beat by control system
Open, the LNG liquid in LNG storage tank is sent into BOG condensation recovering devices by immersed pump, then controlling to adjust valve by control system beats
Open, the liquid nitrogen in liquid nitrogen storage device enters BOG condensation recovering devices, cooling enters the LNG liquid of BOG condensation recovering devices.It is preferred that
, control system is connected with warning device, when temperature-detecting device A, which detects in storage tank LNG fluid temperatures, is higher than setting value,
Or when pressure-detecting device A detects LNG storage tank pressure higher than setting value, warning device is alarmed.
Heat source passages outlet and the pipeline of LNG storage tank when the temperature-detecting device B connection BOG condensation recovering devices detected
When the temperature of interior LNG liquid is higher than setting value, control system controls to adjust valve opening and becomes big；When temperature-detecting device B is detected
Connection BOG condensation recovering devices heat source passages outlet and LNG storage tank pipeline in LNG liquid temperature be less than setting value when,
Control system controls to adjust valve opening and diminished.When pressure-detecting device A detects LNG storage tank pressure less than setting value, control
System closes stop valve and regulating valve.
By setting temperature, pressure-detecting device, the centralized Control of BOG condensate recovery systems is realized using control system
And automatically control, stable and reliable operation, save artificial.
It is preferred that, nitrogen blow-down pipe connection nitrogen discharge device, the blow-down pipe connection nitrogen blow-down pipe of liquid nitrogen storage device,
Diffused by nitrogen discharge device, the pressure detecting for detecting nitrogen pressure in nitrogen blow-down pipe is provided with nitrogen blow-down pipe
Device B and quick action emergency valve, pressure-detecting device B and quick action emergency valve are connected with control system, can be real by control system
Existing remote control.When pressure-detecting device B, which detects in nitrogen blow-down pipe nitrogen pressure, is higher than setting value, control system control
Quick action emergency valve is opened, and nitrogen is externally vented by nitrogen discharge device；When pressure-detecting device B is detected in nitrogen blow-down pipe
When nitrogen pressure is less than setting value, control system control quick action emergency valve is closed, and prevents humid air from entering.
By setting pressure-detecting device B and quick action emergency valve, realize the Stress control to liquid nitrogen pipeline, it is to avoid height
The generation of operating mode, safety and stability are pressed, and regulation and control are equally carried out using control system and is saved manually.
It is preferred that, the outer cover of described BOG condensation recovering devices, which is equipped with cold insulated cabinet, cold insulated cabinet, is located at BOG condensation recovery
Cold insulation material is filled between device and the inwall of cold insulated cabinet.By setting cold insulated cabinet and cold insulation material, it is to avoid cold
The loss of amount, saves energy consumption.
It is preferred that, described cold insulation material is pearlife.
It is preferred that, described BOG condensation recovering devices are plate-fin heat exchanger.
It is preferred that, nitrogen protection pipeline is additionally provided with described cold insulated cabinet, prevents humid air from entering cold insulated cabinet and shadow
Ring and arrive cold insulation effect；Described nitrogen blow-down pipe is connected by branch pipe and is provided with control valve on nitrogen protection pipeline, branch pipe.Cold insulation
Upper box part is provided with exhaust-valve, cold insulation material inlet and inspection manhole.
It is preferred that, precooling chuck is also associated between the low-temperature receiver channel outlet and heat source passages entrance of BOG condensation recovering devices,
Described precooling chuck has tubular interior tube layer and the chuck layer being sheathed on the outside of interior tube layer, and interior tube layer and chuck layer are close
Closed chamber body, interior tube layer and the two ends of chuck layer are provided with the interface for connecting respective internal cavity, and the low-temperature receiver of condensation recovering device leads to
Road exports the interface A of connection clip jacket layer, another interface B connections nitrogen blow-down pipe of chuck layer, the interface A connection thermals source of interior tube layer
Feeder connection, the discharging tube of another interface B connections immersed pump of interior tube layer, the interface A of chuck layer is located at the interface A of interior tube layer
Same one end of precooling chuck, so as to be precooled using the nitrogen of discharge to thermal source LNG liquid, thermal source LNG liquid walks inner tube
Layer, low-temperature receiver nitrogen walks chuck layer, the pre- heat exchange of adverse current.By setting precooling chuck, the heat exchange of liquid nitrogen and thermal source LNG liquid is increased
Area, improves condensation efficiency.
Described liquid nitrogen storage device is liquid nitrogen storage tank or liquid nitrogen steel cylinder group.
The method that BOG is reclaimed using a kind of described BOG condensate recovery systems for LNG gas stations, by LNG storage tank
LNG liquid BOG condensation recovering devices are sent into by immersed pump, and by introducing the liquid nitrogen of BOG condensation recovering devices to the LNG liquid of introducing
Body is cooled down, and the BOG that the LNG liquid after cooling is back in storage tank, cooling storage tank simultaneously makes BOG liquefy.
The exchange process completed in BOG condensation recovering devices is liquid nitrogen and the LNG of overheat heat exchanging process.
Further, in addition to using the nitrogen after being cooled down to LNG liquid in BOG condensation recovering devices continue to from diving
The step of LNG liquid that liquid pump comes out carries out precooling.
Further, when temperature-detecting device A, which detects in storage tank LNG fluid temperatures, is higher than setting value, or pressure is worked as
When detection means A detects LNG storage tank pressure higher than setting value, stop valve is controlled to open by control system, immersed pump is by LNG
LNG liquid feeding BOG condensation recovering devices in storage tank, then control to adjust valve by control system and open, liquid nitrogen storage device
Interior liquid nitrogen enters BOG condensation recovering devices, and cooling enters the LNG liquid of BOG condensation recovering devices；When temperature-detecting device B detections
The temperature of LNG liquid is higher than setting value in the heat source passages outlet of the connection BOG condensation recovering devices arrived and the pipeline of LNG storage tank
When, control system controls to adjust valve opening and becomes big；When the thermal source of the temperature-detecting device B connection BOG condensation recovering devices detected
When the temperature of LNG liquid is less than setting value in the pipeline of channel outlet and LNG storage tank, control system controls to adjust valve opening and become
It is small.When pressure-detecting device A detects LNG storage tank pressure less than setting value, control system closes stop valve and regulating valve.
Further, when pressure-detecting device B, which detects in nitrogen blow-down pipe nitrogen pressure, is higher than setting value, control system
System control quick action emergency valve is opened, and nitrogen is externally vented by nitrogen discharge device；Put when pressure-detecting device B detects nitrogen
When nitrogen pressure is less than setting value in blank pipe, control system control quick action emergency valve is closed, and prevents humid air from entering.
To sum up, the beneficial effects of the invention are as follows：
The present invention is followed by pipeline in immersed pump, when the fluid temperature in LNG storage tank is too high or gas-phase space pressure is excessive,
The liquid for inserting the liquid into overheat introduces BOG condensation recovering devices, while liquid nitrogen enters the condenser, by hydrothermal solution in heat exchanger
LNG cooling, the LNG liquid being subcooled after cooling from tank top enter, the BOG gas coolings that will be overheated by spraying in storage tank
And liquefy, making the pressure of storage tank reduces.
The present invention uses liquid nitrogen and LNG and completes liquid liquid heat exchange in BOG reclaims condenser, and advantage is heat exchanger face
It is able to can greatly reduce, disposable input cost reduction, the BOG gases in storage tank also achieve zero-emission, have both saved the energy,
Avoid the pollution to environment.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention.
Mark and corresponding parts title in accompanying drawing：
1- LNG storage tanks, 2- BOG condensation recovering devices, 3- immersed pumps, 4- liquid nitrogen storage devices, 5- pressure-detecting device A,
6- temperature-detecting devices A, 7- temperature-detecting device B, 8- stop valve, 9- regulating valves, 10- pressure-detecting devices B, 11- is promptly cut
Disconnected valve, 12- cold insulated cabinets.
Embodiment
The present invention will now be described in further detail with reference to the accompanying drawings and the accompanying drawings, but embodiments of the present invention
Not limited to this.
Embodiment：
As shown in figure 1, a kind of BOG condensate recovery systems for LNG gas stations, including LNG storage tank 1, BOG condensation are reclaimed
Device 2, immersed pump 3 and liquid nitrogen storage device 4, the feed tube of immersed pump 3 connect the discharging tube of LNG storage tank 1, immersed pump by pipeline
3 discharging tube connects filling machine by pipeline, and the discharging tube of immersed pump 3 also connects the thermal source of BOG condensation recovering devices 2 by pipeline
Channel entrance, BOG condensation recovering devices 2 heat source passages outlet by pipeline connection LNG storage tank 1, BOG condensation recovering devices 2 it is cold
Source channels import connects the discharging tube of liquid nitrogen storage device 4, the low-temperature receiver channel outlet connection of BOG condensation recovering devices 2 by pipeline
Nitrogen blow-down pipe.
The present invention uses liquid nitrogen and LNG and completes liquid liquid heat exchange in BOG reclaims condenser, and advantage is heat exchanger face
It is able to can greatly reduce, disposable input cost reduction, the BOG gases in storage tank also achieve zero-emission, have both saved the energy,
Avoid the pollution to environment.
It is preferred that, described recovery system also includes being provided for detection LNG storages in control system, described LNG storage tank 1
It is provided for detecting the temperature-detecting device of LNG fluid temperatures in storage tank in the pressure-detecting device A5 of the pressure of tank 1, LNG storage tank 1
It is provided with the heat source passages outlet of A6, connection BOG condensation recovering device 2 and the pipeline of LNG storage tank 1 for detecting LNG in pipeline
The temperature-detecting device B7 of fluid temperature, connects the heat source passages import of the discharging tube and BOG condensation recovering devices 2 of immersed pump 3
Stop valve 8, discharging tube and the low-temperature receiver channel entrance of BOG condensation recovering devices 2 of connection liquid nitrogen storage device 4 are provided with pipeline
Regulating valve 9, pressure-detecting device A5, temperature-detecting device A6, temperature-detecting device B7, stop valve 8 and tune are provided with pipeline
Section valve 9 is connected with control system, can realize remote control by control system.When temperature-detecting device A6 is detected in storage tank
When LNG fluid temperatures are higher than setting value, or when pressure-detecting device A5 detects the pressure of LNG storage tank 1 higher than setting value, pass through
Control system control stop valve 8 is opened, and the LNG liquid in LNG storage tank 1 is sent into BOG condensation recovering devices 2, Ran Houtong by immersed pump 3
Cross control system control and regulation valve 9 to open, the liquid nitrogen in liquid nitrogen storage device 4 enters BOG condensation recovering devices 2, and cooling enters BOG
The LNG liquid of condensation recovering device 2.It is preferred that, control system is connected with warning device, when temperature-detecting device A6 detects storage tank
When interior LNG fluid temperatures are higher than setting value, or when pressure-detecting device A5 detects the pressure of LNG storage tank 1 higher than setting value, report
Alarm device is alarmed.
Heat source passages outlet and LNG storage tank 1 when the temperature-detecting device B7 connection BOG condensation recovering devices 2 detected
When the temperature of LNG liquid is higher than setting value in pipeline, control system controls to adjust the aperture of valve 9 and becomes big；As temperature-detecting device B7
The temperature of LNG liquid, which is less than, in the heat source passages outlet of the connection BOG condensation recovering devices 2 detected and the pipeline of LNG storage tank 1 sets
During definite value, control system controls to adjust the aperture of valve 9 and diminished.When pressure-detecting device A5 detects the pressure of LNG storage tank 1 less than setting
During value, control system closes stop valve 8 and regulating valve 9.
By setting temperature, pressure-detecting device, the centralized Control of BOG condensate recovery systems is realized using control system
And automatically control, stable and reliable operation, save artificial.
It is preferred that, nitrogen blow-down pipe connection nitrogen discharge device, the blow-down pipe connection nitrogen emptying of liquid nitrogen storage device 4
Pipe, is diffused by nitrogen discharge device, the pressure for detecting nitrogen pressure in nitrogen blow-down pipe is provided with nitrogen blow-down pipe
Detection means B10 and quick action emergency valve 11, pressure-detecting device B10 and quick action emergency valve 11 are connected with control system, can be led to
Cross control system and realize remote control.It is higher than setting value when pressure-detecting device B10 detects nitrogen pressure in nitrogen blow-down pipe
When, control system control quick action emergency valve 11 is opened, and nitrogen is externally vented by nitrogen discharge device；Work as pressure-detecting device
When B10 detects in nitrogen blow-down pipe nitrogen pressure and is less than setting value, control system control quick action emergency valve 11 is closed, and prevents tide
Humid air enters.
By setting pressure-detecting device B10 and quick action emergency valve 11, the Stress control to liquid nitrogen pipeline is realized, it is to avoid
The generation of high pressure operating mode, safety and stability, and same regulation and control are carried out using control system save artificial.
It is preferred that, the outer cover of described BOG condensation recovering devices 2, which is equipped with cold insulated cabinet 12, cold insulated cabinet 12, is located at BOG condensations
Cold insulation material is filled between the inwall of recover 2 and cold insulated cabinet 12.By setting cold insulated cabinet 12 and cold insulation material,
The loss of cold is avoided, energy consumption is saved.
It is preferred that, described cold insulation material is pearlife.
It is preferred that, described BOG condensation recovering devices 2 are plate-fin heat exchanger.
It is preferred that, nitrogen protection pipeline is additionally provided with described cold insulated cabinet 12, prevents humid air from entering cold insulated cabinet 12
And have influence on cold insulation effect；Described nitrogen blow-down pipe is connected by branch pipe and is provided with control valve on nitrogen protection pipeline, branch pipe.
The top of cold insulated cabinet 12 is provided with exhaust-valve, cold insulation material inlet and inspection manhole.
It is preferred that, precooling folder is also associated between the low-temperature receiver channel outlet and heat source passages entrance of BOG condensation recovering devices 2
Set, described precooling chuck has tubular interior tube layer and the chuck layer being sheathed on the outside of interior tube layer, and interior tube layer and chuck layer are equal
For airtight cavity, interior tube layer is provided with the interface for connecting respective internal cavity with the two ends of chuck layer, condensation recovering device it is cold
The interface A of source channels outlet connection chuck layer, another interface B connections nitrogen blow-down pipe of chuck layer, the interface A connections of interior tube layer
Heat source passages entrance, the discharging tube of another interface B connections immersed pump 3 of interior tube layer, the interface A of chuck layer and the interface of interior tube layer
A is located at same one end of precooling chuck, so as to be precooled using the nitrogen of discharge to thermal source LNG liquid, thermal source LNG liquid is walked
Interior tube layer, low-temperature receiver nitrogen walks chuck layer, the pre- heat exchange of adverse current.By setting precooling chuck, liquid nitrogen and thermal source LNG liquid are increased
Heat exchange area, improves condensation efficiency.
Described liquid nitrogen storage device 4 is liquid nitrogen storage tank or liquid nitrogen steel cylinder group.
The method that BOG is reclaimed using a kind of described BOG condensate recovery systems for LNG gas stations, by LNG storage tank 1
Interior LNG liquid sends into BOG condensation recovering devices 2 by immersed pump 3, and by introducing the liquid nitrogen of BOG condensation recovering devices 2 to introducing
LNG liquid is cooled down, and the BOG that the LNG liquid after cooling is back in storage tank, cooling storage tank simultaneously makes BOG liquefy.
The exchange process completed in BOG condensation recovering devices 2 is liquid nitrogen and the LNG of overheat heat exchanging process.
Further, in addition to using the nitrogen continuation after being cooled down to LNG liquid in BOG condensation recovering devices 2 to from
The step of LNG liquid that immersed pump 3 comes out carries out precooling.
Further, when temperature-detecting device A6, which detects in storage tank LNG fluid temperatures, is higher than setting value, or pressure is worked as
When detection means A5 detects the pressure of LNG storage tank 1 higher than setting value, stop valve 8 is controlled to open by control system, immersed pump 3
By the LNG liquid feeding BOG condensation recovering devices 2 in LNG storage tank 1, valve 9 is then controlled to adjust by control system and opened, liquid nitrogen
Liquid nitrogen in storage device 4 enters BOG condensation recovering devices 2, and cooling enters the LNG liquid of BOG condensation recovering devices 2；When temperature inspection
Survey the temperature of LNG liquid in the heat source passages outlet for the connection BOG condensation recovering devices 2 that device B7 is detected and the pipeline of LNG storage tank 1
When degree is higher than setting value, control system controls to adjust the aperture of valve 9 and becomes big；When the connection BOG that temperature-detecting device B7 is detected is cold
When the temperature of LNG liquid is less than setting value in the heat source passages outlet of solidifying recover 2 and the pipeline of LNG storage tank 1, control system control
The aperture of regulating valve 9 processed diminishes.When pressure-detecting device A5 detects the pressure of LNG storage tank 1 less than setting value, control system is closed
Stop valve 8 and regulating valve 9.
Further, when pressure-detecting device B10, which detects in nitrogen blow-down pipe nitrogen pressure, is higher than setting value, control
System control quick action emergency valve 11 is opened, and nitrogen is externally vented by nitrogen discharge device；When pressure-detecting device B10 is detected
When nitrogen pressure is less than setting value in nitrogen blow-down pipe, control system control quick action emergency valve 11 is closed, and prevents humid air from entering
Enter.
In the present embodiment, the discharging tube of immersed pump 3 also connects LNG storage tank 1 by pipeline.The described He of connection LNG storage tank 1
The feed liquor pipeline of immersed pump 3 is also associated with the interface for connecting tank car.
As described above, the present invention can be realized preferably.
Claims (10)
1. a kind of BOG condensate recovery systems for LNG gas stations, it is characterised in that including LNG storage tank（1）, BOG condenses back
Receive device（2）, immersed pump（3）With liquid nitrogen storage device（4）, immersed pump（3）Feed tube LNG storage tank is connected by pipeline（1）'s
Discharging tube, immersed pump（3）Discharging tube pass through pipeline connect filling machine, immersed pump（3）Discharging tube BOG is also connected by pipeline
Condensation recovering device（2）Heat source passages import, BOG condensation recovering devices（2）Heat source passages outlet LNG storage tank is connected by pipeline
（1）, BOG condensation recovering devices（2）Low-temperature receiver channel entrance pass through pipeline connect liquid nitrogen storage device（4）Discharging tube, BOG condensation
Recover（2）Low-temperature receiver channel outlet connection nitrogen blow-down pipe.
2. a kind of BOG condensate recovery systems for LNG gas stations according to claim 1, it is characterised in that also include
Control system, described LNG storage tank（1）On be provided for detect LNG storage tank（1）The pressure-detecting device A of pressure（5）, LNG storages
Tank（1）On be provided for detect storage tank in LNG fluid temperatures temperature-detecting device A（6）, connect BOG condensation recovering devices（2）'s
Heat source passages are exported and LNG storage tank（1）Pipeline on be provided with temperature-detecting device for detecting LNG fluid temperatures in pipeline
B（7）, connect immersed pump（3）Discharging tube and BOG condensation recovering devices（2）Heat source passages import pipeline on be provided with cut-out
Valve（8）, connect liquid nitrogen storage device（4）Discharging tube and BOG condensation recovering devices（2）Low-temperature receiver channel entrance pipeline on set
There is regulating valve（9）, pressure-detecting device A（5）, temperature-detecting device A（6）, temperature-detecting device B（7）, stop valve（8）And tune
Save valve（9）It is connected with control system.
3. a kind of BOG condensate recovery systems for LNG gas stations according to claim 2, it is characterised in that nitrogen is put
Blank pipe connects the pressure detecting being provided with nitrogen discharge device, nitrogen blow-down pipe for detecting nitrogen pressure in nitrogen blow-down pipe
Device B（10）And quick action emergency valve（11）, pressure-detecting device B（10）And quick action emergency valve（11）It is connected with control system.
4. a kind of BOG condensate recovery systems for LNG gas stations according to claim 1, it is characterised in that described
BOG condensation recovering devices（2）Outer cover be equipped with cold insulated cabinet（12）, cold insulated cabinet（12）It is interior to be located at BOG condensation recovering devices（2）With cold insulation
Case（12）Inwall between be filled with cold insulation material.
5. a kind of BOG condensate recovery systems for LNG gas stations according to claim 1, it is characterised in that described
BOG condensation recovering devices（2）For plate-fin heat exchanger.
6. a kind of BOG condensate recovery systems for LNG gas stations according to claim 1, it is characterised in that BOG is cold
Solidifying recover（2）Low-temperature receiver channel outlet and heat source passages entrance between be also associated with precooling chuck, described precooling chuck tool
Have tubular interior tube layer and the chuck layer being sheathed on the outside of interior tube layer, interior tube layer and chuck layer are airtight cavity, interior tube layer and
The two ends of chuck layer are provided with the interface for connecting respective internal cavity, the low-temperature receiver channel outlet connection chuck layer of condensation recovering device
Interface A, another interface B connections nitrogen blow-down pipe of chuck layer, the interface A connection heat source passages entrances of interior tube layer, interior tube layer
Another interface B connections immersed pump（3）Discharging tube, the interface A of the chuck layer and interface A of interior tube layer be located at precooling chuck it is same
One end.
7. BOG method is reclaimed using a kind of BOG condensate recovery systems for LNG gas stations as claimed in claim 1, its
It is characterised by, by LNG storage tank（1）Interior LNG liquid passes through immersed pump（3）Send into BOG condensation recovering devices（2）, and by introducing BOG
Condensation recovering device（2）Liquid nitrogen the LNG liquid of introducing is cooled down, the LNG liquid after cooling is back to storage tank, cools down storage tank
Interior BOG simultaneously makes BOG liquefy.
8. recovery BOG according to claim 7 method, it is characterised in that also including using to BOG condensation recovering devices
（2）Nitrogen after interior LNG liquid is cooled down continues to from immersed pump（3）The step of LNG liquid out carries out precooling.
9. recovery BOG according to claim 7 method, it is characterised in that as temperature-detecting device A（6）Detect storage
When LNG fluid temperatures are higher than setting value in tank, or as pressure-detecting device A（5）Detect LNG storage tank（1）Pressure is higher than setting
During value, stop valve is controlled by control system（8）Open, immersed pump（3）By LNG storage tank（1）Interior LNG liquid feeding BOG is cold
Solidifying recover（2）, valve is then controlled to adjust by control system（9）Open, liquid nitrogen storage device（4）Interior liquid nitrogen enters BOG
Condensation recovering device（2）, cool down and enter BOG condensation recovering devices（2）LNG liquid；As temperature-detecting device B（7）The company detected
Connect BOG condensation recovering devices（2）Heat source passages outlet and LNG storage tank（1）Pipeline in LNG liquid temperature be higher than setting value
When, control system controls to adjust valve（9）Aperture becomes big；As temperature-detecting device B（7）The connection BOG condensation recovering devices detected
（2）Heat source passages outlet and LNG storage tank（1）Pipeline in LNG liquid temperature be less than setting value when, control system control adjust
Save valve（9）Aperture diminishes；As pressure-detecting device A（5）Detect LNG storage tank（1）When pressure is less than setting value, control system is closed
Close stop valve（8）And regulating valve（9）.
10. recovery BOG according to claim 7 method, it is characterised in that as pressure-detecting device B（10）Detect
When nitrogen pressure is higher than setting value in nitrogen blow-down pipe, control system control quick action emergency valve（11）Open, nitrogen passes through nitrogen
Tapping equipment is externally vented；As pressure-detecting device B（10）When detecting in nitrogen blow-down pipe nitrogen pressure and being less than setting value, control
System processed controls quick action emergency valve（11）Close.
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| CN114754287A (en) * | 2021-01-08 | 2022-07-15 | 神华氢能科技如皋有限责任公司 | Movable hydrogen filling platform |
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| KR20120091270A (en) * | 2009-11-18 | 2012-08-17 | 쉘 인터내셔날 리써취 마트샤피지 비.브이. | Method of handling a boil off gas stream and an apparatus therefor |
| CN101858683A (en) * | 2010-04-30 | 2010-10-13 | 浙江大学 | System for producing liquefied natural gas by utilizing liquid nitrogen cold energy |
| CN102155615B (en) * | 2011-01-24 | 2014-03-19 | 成都深冷科技有限公司 | LNG (liquefied natural gas) pump-free air-entrapping method with BOG (boil off gas) recycling function and LNG pump-free air-entrapping device |
| CN203868681U (en) * | 2014-05-08 | 2014-10-08 | 重庆春升科技发展有限公司 | Liquefied natural gas flash steam recovery device |
| CN204062478U (en) * | 2014-09-18 | 2014-12-31 | 成都华气厚普机电设备股份有限公司 | A kind of BOG liquefaction plant again |
| CN104390136B (en) * | 2014-11-11 | 2017-01-11 | 南京工业大学 | BOG recovering method |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204852919U (en) * | 2015-08-26 | 2015-12-09 | 成都深冷科技有限公司 | A BOG condensate recovery system for LNG gas station |
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