CN105135211A - BOG condensation recycling system and method for LNG station - Google Patents
BOG condensation recycling system and method for LNG station Download PDFInfo
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- CN105135211A CN105135211A CN201510527627.7A CN201510527627A CN105135211A CN 105135211 A CN105135211 A CN 105135211A CN 201510527627 A CN201510527627 A CN 201510527627A CN 105135211 A CN105135211 A CN 105135211A
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Abstract
The invention discloses a BOG condensation recycling system for an LNG station. A liquid inlet pipe of an immersed pump (3) is connected with a liquid drain pipe of an LNG storage tank (1) through a pipeline. A liquid drain pipe of the immersed pump (3) is connected with a gas filling machine through a pipeline and further connected with a heat source channel inlet of a BOG condensation recoverer (2) through a pipeline. A heat source channel outlet of the BOG condensation recoverer (2) is connected with a liquid drain pipe of a liquid nitrogen storage device (4) through a pipeline. A cold source channel outlet of the BOG condensation recoverer (2) is connected with a nitrogen blow-down pipe. The invention further discloses a method for recycling BOG. The BOG condensation recycling system and method have the beneficial effects that cost is reduced, zero discharge of BOG in the storage tank is achieved, energy is saved, and pollution to environment is avoided.
Description
Technical field
The present invention relates to BOG gas recovery techniques field, particularly, relate to a kind of BOG condensate recovery system for LNG gas station and method.
Background technique
LNG(LNG Liquefied natural gas) be a kind of clean energy resource.Along with LNG fuel automobile (boats and ships), town dweller's combustion gas, boiler flue gas and the progressively extensive use of the field such as fuel gas generation, ceramic post sintering, LNG consumption requirements amount is just presenting quick growth trend in recent years.The source of LNG mainly contains two-part, namely usually said " land gas " (LNG that land LNG liquefaction plant is produced, normally transported by LNG transport vehicle), " extra large gas " (LNG is normally transported to land LNG receiving station by Large LNG cargo ship and stores by overseas LNG).LNG condensing temperature is at ambient pressure about-162 DEG C; although LNG warehousing and transportation facilities or LNG conveyance conduit all take good cold insulation protective measure; but owing to there is the very large temperature difference between itself and environment; the heat absorption evaporation of LNG storing, in transportation process always exists, and BOG(LNG naturally absorbs heat the gas evaporated in the processes such as storages, transport) generation inevitable.LNG is along with the continuous increase of caloric receptivity, the production of BOG can increase gradually, LNG accumulating pressure also can constantly rise thereupon, if do not take effective step-down measure in the case, for avoiding accidents such as causing superpressure safely, when LNG accumulating pressure reaches certain pressure, generally can carry out release by diffusing mode automatic or manual to air, diffusing of BOG can cause environmental pollution, energy waste and economic loss.For this reason, the recycling of BOG just becomes in LNG application project the problem needing to solve.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of zero-emission, both energy saving, also avoids the BOG condensate recovery system for LNG gas station to the pollution of environment and method.
The present invention's adopted technological scheme that solves the problem is:
A kind of BOG condensate recovery system for LNG gas station, comprise LNG storage tank, BOG condensation recovering device, immersed pump and liquid nitrogen storage device, the liquid inlet pipe of immersed pump connects the liquid-discharging tube of LNG storage tank by pipeline, the liquid-discharging tube of immersed pump connects filling machine by pipeline, the liquid-discharging tube of immersed pump also connects the heat source passages import of BOG condensation recovering device by pipeline, the heat source passages outlet of BOG condensation recovering device connects LNG storage tank by pipeline, the low-temperature receiver channel entrance of BOG condensation recovering device connects the liquid-discharging tube of liquid nitrogen storage device by pipeline, the low-temperature receiver channel outlet of BOG condensation recovering device connects nitrogen blow-down pipe.
What the present invention adopted is that liquid nitrogen and LNG complete the heat exchange of liquid liquid in BOG recovery condenser, advantage is that heat exchanger face can greatly reduce, and disposable input cost reduces, and the BOG gas in storage tank also achieves zero-emission, both save the energy, it also avoid the pollution to environment.
Preferably, described reclaiming system also comprises control system, described LNG storage tank is arranged the pressure-detecting device A for detecting LNG storage tank pressure, LNG storage tank is arranged the temperature-detecting device A for detecting LNG fluid temperature in storage tank, connect the temperature-detecting device B heat source passages outlet of BOG condensation recovering device and the pipeline of LNG storage tank be provided with for LNG fluid temperature in testing pipes, the pipeline of the connection liquid-discharging tube of immersed pump and the heat source passages import of BOG condensation recovering device is provided with cut-off valve, the pipeline of the liquid-discharging tube of connection liquid nitrogen storage device and the low-temperature receiver channel entrance of BOG condensation recovering device is provided with modulating valve, pressure-detecting device A, temperature-detecting device A, temperature-detecting device B, cut-off valve is all connected with control system with modulating valve, telecontrol is realized by control system.When temperature-detecting device A detects that in storage tank, LNG fluid temperature is higher than setting value, or when pressure-detecting device A detects LNG storage tank pressure higher than setting value, control cut-off valve by control system to open, LNG liquid in LNG storage tank is sent into BOG condensation recovering device by immersed pump, then opened by control system regulating and controlling valve, liquid nitrogen in liquid nitrogen storage device enters BOG condensation recovering device, and cooling enters the LNG liquid of BOG condensation recovering device.Preferably, control system is connected with warning device, and when temperature-detecting device A detects that in storage tank, LNG fluid temperature is higher than setting value, or when pressure-detecting device A detects LNG storage tank pressure higher than setting value, warning device is reported to the police.
When the temperature of LNG liquid in the heat source passages outlet of the connection BOG condensation recovering device that temperature-detecting device B detects and the pipeline of LNG storage tank is higher than setting value, control system regulating and controlling valve opening becomes large; When the temperature of LNG liquid in the heat source passages outlet of the connection BOG condensation recovering device that temperature-detecting device B detects and the pipeline of LNG storage tank is lower than setting value, control system regulating and controlling valve opening diminishes.When pressure-detecting device A detects LNG storage tank pressure lower than setting value, control system closes cut-off valve and modulating valve.
By set temperature, pressure-detecting device, adopt control system achieve the centralized control of BOG condensate recovery system and automatically control, stable and reliable operation, save artificial.
Preferably, nitrogen blow-down pipe connects nitrogen discharge device, the blow-down pipe of liquid nitrogen storage device connects nitrogen blow-down pipe, diffused by nitrogen discharge device, nitrogen blow-down pipe is provided with the pressure-detecting device B for detecting nitrogen pressure in nitrogen blow-down pipe and Emergeny Cutoff Valves, pressure-detecting device B is all connected with control system with Emergeny Cutoff Valves, realizes telecontrol by control system.When pressure-detecting device B detects that in nitrogen blow-down pipe, nitrogen pressure is higher than setting value, control system controls Emergeny Cutoff Valves and opens, and nitrogen is by the external emptying of nitrogen discharge device; When pressure-detecting device B detects that in nitrogen blow-down pipe, nitrogen pressure is lower than setting value, control system controls Emergeny Cutoff Valves and closes, and prevents humid air from entering.
By arranging pressure-detecting device B and Emergeny Cutoff Valves, achieving the Stress control to liquid nitrogen pipeline, avoiding the generation of high pressure operating mode, safety and stability, and the same control system that adopts carries out regulation and control saving manually.
Preferably, the outer cover of described BOG condensation recovering device is equipped with cold insulated cabinet, is filled with cold insulation material in cold insulated cabinet between BOG condensation recovering device and the inwall of cold insulated cabinet.By arranging cold insulated cabinet and cold insulation material, avoiding the loss of cold, saving energy consumption.
Preferably, described cold insulation material is pearlife.
Preferably, described BOG condensation recovering device is plate-fin heat exchanger.
Preferably, in described cold insulated cabinet, be also provided with nitrogen protection pipeline, prevent humid air from entering cold insulated cabinet and have influence on cold insulation effect; Described nitrogen blow-down pipe is communicated with nitrogen protection pipeline by arm, and arm is provided with control valve.Cold insulated cabinet top is provided with exhaust-valve, cold insulation material inlet and inspection manhole.
Preferably, precooling chuck is also connected with between the low-temperature receiver channel outlet of BOG condensation recovering device and heat source passages entrance, described precooling chuck has tubular interior tube layer and is sheathed on the chuck layer outside interior tube layer, interior tube layer and chuck layer are airtight cavity, interior tube layer is provided with the two ends of chuck layer the interface being communicated with respective internal cavity, the low-temperature receiver channel outlet of condensation recovering device connects the interface A of chuck layer, another interface B of chuck layer connects nitrogen blow-down pipe, the interface A of interior tube layer connects heat source passages entrance, another interface B of interior tube layer connects the liquid-discharging tube of immersed pump, the interface A of chuck layer and the interface A of interior tube layer is positioned at same one end of precooling chuck, thus utilize the nitrogen of discharge to carry out pre-cooled to thermal source LNG liquid, thermal source LNG liquid walks interior tube layer, low-temperature receiver nitrogen walks chuck layer, the pre-heat exchange of adverse current.By arranging precooling chuck, increasing the heat exchange area of liquid nitrogen and thermal source LNG liquid, improve condensation efficiency.
Described liquid nitrogen storage device is liquid nitrogen storage tank or liquid nitrogen steel cylinder group.
A kind of BOG condensate recovery system for LNG gas station described in employing reclaims the method for BOG, LNG liquid in LNG storage tank is sent into BOG condensation recovering device by immersed pump, and by the liquid nitrogen introducing BOG condensation recovering device, the LNG liquid introduced is cooled, cooled LNG liquid is back to storage tank, and the BOG in cooling storage tank also makes BOG liquefy.
The exchange process completed in BOG condensation recovering device is the heat exchanging process of liquid nitrogen and overheated LNG.
Further, also comprise adopting cooled nitrogen continuation is carried out to the step of carrying out precooling from immersed pump LNG liquid out to LNG liquid in BOG condensation recovering device.
Further, when temperature-detecting device A detects that in storage tank, LNG fluid temperature is higher than setting value, or when pressure-detecting device A detects LNG storage tank pressure higher than setting value, control cut-off valve by control system to open, LNG liquid in LNG storage tank is sent into BOG condensation recovering device by immersed pump, then opened by control system regulating and controlling valve, the liquid nitrogen in liquid nitrogen storage device enters BOG condensation recovering device, and cooling enters the LNG liquid of BOG condensation recovering device; When the temperature of LNG liquid in the heat source passages outlet of the connection BOG condensation recovering device that temperature-detecting device B detects and the pipeline of LNG storage tank is higher than setting value, control system regulating and controlling valve opening becomes large; When the temperature of LNG liquid in the heat source passages outlet of the connection BOG condensation recovering device that temperature-detecting device B detects and the pipeline of LNG storage tank is lower than setting value, control system regulating and controlling valve opening diminishes.When pressure-detecting device A detects LNG storage tank pressure lower than setting value, control system closes cut-off valve and modulating valve.
Further, when pressure-detecting device B detects that in nitrogen blow-down pipe, nitrogen pressure is higher than setting value, control system controls Emergeny Cutoff Valves and opens, and nitrogen is by the external emptying of nitrogen discharge device; When pressure-detecting device B detects that in nitrogen blow-down pipe, nitrogen pressure is lower than setting value, control system controls Emergeny Cutoff Valves and closes, and prevents humid air from entering.
To sum up, the invention has the beneficial effects as follows:
The present invention is at immersed pump rear tube line, when the fluid temperature in LNG storage tank is too high or gas-phase space pressure is excessive, insert the liquid into overheated liquid and introduce BOG condensation recovering device, liquid nitrogen enters this condenser simultaneously, the LNG cooling of hydrothermal solution will be crossed in heat exchanger, LNG liquid excessively cold after cooling enters from tank top, by spraying BOG gas cooling overheated in storage tank and liquefying, the pressure of storage tank is reduced.
What the present invention adopted is that liquid nitrogen and LNG complete the heat exchange of liquid liquid in BOG recovery condenser, advantage is that heat exchanger face can greatly reduce, and disposable input cost reduces, and the BOG gas in storage tank also achieves zero-emission, both save the energy, it also avoid the pollution to environment.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Mark and corresponding component title in accompanying drawing:
1-LNG storage tank, 2-BOG condensation recovering device, 3-immersed pump, 4-liquid nitrogen storage device, 5-pressure-detecting device A, 6-temperature-detecting device A, 7-temperature-detecting device B, 8-cut-off valve, 9-modulating valve, 10-pressure-detecting device B, 11-Emergeny Cutoff Valves, 12-cold insulated cabinet.
Embodiment
Below in conjunction with embodiment and accompanying drawing, to the detailed description further of the present invention's do, but embodiments of the present invention are not limited thereto.
Embodiment:
As shown in Figure 1, a kind of BOG condensate recovery system for LNG gas station, comprise LNG storage tank 1, BOG condensation recovering device 2, immersed pump 3 and liquid nitrogen storage device 4, the liquid inlet pipe of immersed pump 3 connects the liquid-discharging tube of LNG storage tank 1 by pipeline, the liquid-discharging tube of immersed pump 3 connects filling machine by pipeline, the liquid-discharging tube of immersed pump 3 also connects the heat source passages import of BOG condensation recovering device 2 by pipeline, the heat source passages outlet of BOG condensation recovering device 2 connects LNG storage tank 1 by pipeline, the low-temperature receiver channel entrance of BOG condensation recovering device 2 connects the liquid-discharging tube of liquid nitrogen storage device 4 by pipeline, the low-temperature receiver channel outlet of BOG condensation recovering device 2 connects nitrogen blow-down pipe.
What the present invention adopted is that liquid nitrogen and LNG complete the heat exchange of liquid liquid in BOG recovery condenser, advantage is that heat exchanger face can greatly reduce, and disposable input cost reduces, and the BOG gas in storage tank also achieves zero-emission, both save the energy, it also avoid the pollution to environment.
Preferably, described reclaiming system also comprises control system, described LNG storage tank 1 is arranged the pressure-detecting device A5 for detecting LNG storage tank 1 pressure, LNG storage tank 1 is arranged the temperature-detecting device A6 for detecting LNG fluid temperature in storage tank, connect the temperature-detecting device B7 heat source passages outlet of BOG condensation recovering device 2 and the pipeline of LNG storage tank 1 be provided with for LNG fluid temperature in testing pipes, the pipeline of the connection liquid-discharging tube of immersed pump 3 and the heat source passages import of BOG condensation recovering device 2 is provided with cut-off valve 8, the pipeline of the liquid-discharging tube of connection liquid nitrogen storage device 4 and the low-temperature receiver channel entrance of BOG condensation recovering device 2 is provided with modulating valve 9, pressure-detecting device A5, temperature-detecting device A6, temperature-detecting device B7, cut-off valve 8 is all connected with control system with modulating valve 9, telecontrol is realized by control system.When temperature-detecting device A6 detects that in storage tank, LNG fluid temperature is higher than setting value, or when pressure-detecting device A5 detects LNG storage tank 1 pressure higher than setting value, control cut-off valve 8 by control system to open, LNG liquid in LNG storage tank 1 is sent into BOG condensation recovering device 2 by immersed pump 3, then opened by control system regulating and controlling valve 9, liquid nitrogen in liquid nitrogen storage device 4 enters BOG condensation recovering device 2, and cooling enters the LNG liquid of BOG condensation recovering device 2.Preferably, control system is connected with warning device, and when temperature-detecting device A6 detects that in storage tank, LNG fluid temperature is higher than setting value, or when pressure-detecting device A5 detects LNG storage tank 1 pressure higher than setting value, warning device is reported to the police.
When the temperature of LNG liquid in the heat source passages outlet of the connection BOG condensation recovering device 2 that temperature-detecting device B7 detects and the pipeline of LNG storage tank 1 is higher than setting value, control system regulating and controlling valve 9 aperture becomes large; When the temperature of LNG liquid in the heat source passages outlet of the connection BOG condensation recovering device 2 that temperature-detecting device B7 detects and the pipeline of LNG storage tank 1 is lower than setting value, control system regulating and controlling valve 9 aperture diminishes.When pressure-detecting device A5 detects LNG storage tank 1 pressure lower than setting value, control system closes cut-off valve 8 and modulating valve 9.
By set temperature, pressure-detecting device, adopt control system achieve the centralized control of BOG condensate recovery system and automatically control, stable and reliable operation, save artificial.
Preferably, nitrogen blow-down pipe connects nitrogen discharge device, the blow-down pipe of liquid nitrogen storage device 4 connects nitrogen blow-down pipe, diffused by nitrogen discharge device, nitrogen blow-down pipe is provided with the pressure-detecting device B10 for detecting nitrogen pressure in nitrogen blow-down pipe and Emergeny Cutoff Valves 11, pressure-detecting device B10 is all connected with control system with Emergeny Cutoff Valves 11, realizes telecontrol by control system.When pressure-detecting device B10 detects that in nitrogen blow-down pipe, nitrogen pressure is higher than setting value, control system controls Emergeny Cutoff Valves 11 and opens, and nitrogen is by the external emptying of nitrogen discharge device; When pressure-detecting device B10 detects that in nitrogen blow-down pipe, nitrogen pressure is lower than setting value, control system controls Emergeny Cutoff Valves 11 and closes, and prevents humid air from entering.
By arranging pressure-detecting device B10 and Emergeny Cutoff Valves 11, achieving the Stress control to liquid nitrogen pipeline, avoiding the generation of high pressure operating mode, safety and stability, and the same control system that adopts carries out regulation and control saving manually.
Preferably, the outer cover of described BOG condensation recovering device 2 is equipped with cold insulated cabinet 12, is filled with cold insulation material in cold insulated cabinet 12 between BOG condensation recovering device 2 and the inwall of cold insulated cabinet 12.By arranging cold insulated cabinet 12 and cold insulation material, avoiding the loss of cold, saving energy consumption.
Preferably, described cold insulation material is pearlife.
Preferably, described BOG condensation recovering device 2 is plate-fin heat exchanger.
Preferably, in described cold insulated cabinet 12, be also provided with nitrogen protection pipeline, prevent humid air from entering cold insulated cabinet 12 and having influence on cold insulation effect; Described nitrogen blow-down pipe is communicated with nitrogen protection pipeline by arm, and arm is provided with control valve.Cold insulated cabinet 12 top is provided with exhaust-valve, cold insulation material inlet and inspection manhole.
Preferably, precooling chuck is also connected with between the low-temperature receiver channel outlet of BOG condensation recovering device 2 and heat source passages entrance, described precooling chuck has tubular interior tube layer and is sheathed on the chuck layer outside interior tube layer, interior tube layer and chuck layer are airtight cavity, interior tube layer is provided with the two ends of chuck layer the interface being communicated with respective internal cavity, the low-temperature receiver channel outlet of condensation recovering device connects the interface A of chuck layer, another interface B of chuck layer connects nitrogen blow-down pipe, the interface A of interior tube layer connects heat source passages entrance, another interface B of interior tube layer connects the liquid-discharging tube of immersed pump 3, the interface A of chuck layer and the interface A of interior tube layer is positioned at same one end of precooling chuck, thus utilize the nitrogen of discharge to carry out pre-cooled to thermal source LNG liquid, thermal source LNG liquid walks interior tube layer, low-temperature receiver nitrogen walks chuck layer, the pre-heat exchange of adverse current.By arranging precooling chuck, increasing the heat exchange area of liquid nitrogen and thermal source LNG liquid, improve condensation efficiency.
Described liquid nitrogen storage device 4 is liquid nitrogen storage tank or liquid nitrogen steel cylinder group.
A kind of BOG condensate recovery system for LNG gas station described in employing reclaims the method for BOG, LNG liquid in LNG storage tank 1 is sent into BOG condensation recovering device 2 by immersed pump 3, and by the liquid nitrogen introducing BOG condensation recovering device 2, the LNG liquid introduced is cooled, cooled LNG liquid is back to storage tank, and the BOG in cooling storage tank also makes BOG liquefy.
The exchange process completed in BOG condensation recovering device 2 is the heat exchanging process of liquid nitrogen and overheated LNG.
Further, also comprise adopting cooled nitrogen continuation is carried out to the step of carrying out precooling from immersed pump 3 LNG liquid out to LNG liquid in BOG condensation recovering device 2.
Further, when temperature-detecting device A6 detects that in storage tank, LNG fluid temperature is higher than setting value, or when pressure-detecting device A5 detects LNG storage tank 1 pressure higher than setting value, control cut-off valve 8 by control system to open, LNG liquid in LNG storage tank 1 is sent into BOG condensation recovering device 2 by immersed pump 3, then opened by control system regulating and controlling valve 9, the liquid nitrogen in liquid nitrogen storage device 4 enters BOG condensation recovering device 2, and cooling enters the LNG liquid of BOG condensation recovering device 2; When the temperature of LNG liquid in the heat source passages outlet of the connection BOG condensation recovering device 2 that temperature-detecting device B7 detects and the pipeline of LNG storage tank 1 is higher than setting value, control system regulating and controlling valve 9 aperture becomes large; When the temperature of LNG liquid in the heat source passages outlet of the connection BOG condensation recovering device 2 that temperature-detecting device B7 detects and the pipeline of LNG storage tank 1 is lower than setting value, control system regulating and controlling valve 9 aperture diminishes.When pressure-detecting device A5 detects LNG storage tank 1 pressure lower than setting value, control system closes cut-off valve 8 and modulating valve 9.
Further, when pressure-detecting device B10 detects that in nitrogen blow-down pipe, nitrogen pressure is higher than setting value, control system controls Emergeny Cutoff Valves 11 and opens, and nitrogen is by the external emptying of nitrogen discharge device; When pressure-detecting device B10 detects that in nitrogen blow-down pipe, nitrogen pressure is lower than setting value, control system controls Emergeny Cutoff Valves 11 and closes, and prevents humid air from entering.
In the present embodiment, the liquid-discharging tube of immersed pump 3 also connects LNG storage tank 1 by pipeline.Described connection LNG storage tank 1 is also connected with the interface for being connected tank car with the liquid inlet pipe pipeline of immersed pump 3.
As mentioned above, the present invention can be realized preferably.
Claims (10)
1. the BOG condensate recovery system for LNG gas station, it is characterized in that, comprise LNG storage tank (1), BOG condensation recovering device (2), immersed pump (3) and liquid nitrogen storage device (4), the liquid inlet pipe of immersed pump (3) connects the liquid-discharging tube of LNG storage tank (1) by pipeline, the liquid-discharging tube of immersed pump (3) connects filling machine by pipeline, the liquid-discharging tube of immersed pump (3) also connects the heat source passages import of BOG condensation recovering device (2) by pipeline, the heat source passages outlet of BOG condensation recovering device (2) connects LNG storage tank (1) by pipeline, the low-temperature receiver channel entrance of BOG condensation recovering device (2) connects the liquid-discharging tube of liquid nitrogen storage device (4) by pipeline, the low-temperature receiver channel outlet of BOG condensation recovering device (2) connects nitrogen blow-down pipe.
2. a kind of BOG condensate recovery system for LNG gas station according to claim 1, it is characterized in that, described reclaiming system also comprises control system, the upper pressure-detecting device A(5 arranged for detecting LNG storage tank (1) pressure of described LNG storage tank (1)), the upper temperature-detecting device A(6 arranged for detecting LNG fluid temperature in storage tank of LNG storage tank (1)), connect on the heat source passages outlet of BOG condensation recovering device (2) and the pipeline of LNG storage tank (1) and be provided with temperature-detecting device B(7 for LNG fluid temperature in testing pipes), the pipeline of the liquid-discharging tube of connection immersed pump (3) and the heat source passages import of BOG condensation recovering device (2) is provided with cut-off valve (8), the pipeline of the liquid-discharging tube of connection liquid nitrogen storage device (4) and the low-temperature receiver channel entrance of BOG condensation recovering device (2) is provided with modulating valve (9), pressure-detecting device A(5), temperature-detecting device A(6), temperature-detecting device B(7), cut-off valve (8) is all connected with control system with modulating valve (9).
3. a kind of BOG condensate recovery system for LNG gas station according to claim 2, it is characterized in that, nitrogen blow-down pipe connects nitrogen discharge device, nitrogen blow-down pipe is provided with the pressure-detecting device B(10 for detecting nitrogen pressure in nitrogen blow-down pipe) and Emergeny Cutoff Valves (11), pressure-detecting device B(10) be all connected with control system with Emergeny Cutoff Valves (11).
4. a kind of BOG condensate recovery system for LNG gas station according to claim 1, it is characterized in that, the outer cover of described BOG condensation recovering device (2) is equipped with cold insulated cabinet (12), is filled with cold insulation material between the inwall being positioned at BOG condensation recovering device (2) and cold insulated cabinet (12) in cold insulated cabinet (12).
5. a kind of BOG condensate recovery system for LNG gas station according to claim 1, is characterized in that, described BOG condensation recovering device (2) is plate-fin heat exchanger.
6. a kind of BOG condensate recovery system for LNG gas station according to claim 1, it is characterized in that, precooling chuck is also connected with between the low-temperature receiver channel outlet of BOG condensation recovering device (2) and heat source passages entrance, described precooling chuck has tubular interior tube layer and is sheathed on the chuck layer outside interior tube layer, interior tube layer and chuck layer are airtight cavity, interior tube layer is provided with the two ends of chuck layer the interface being communicated with respective internal cavity, the low-temperature receiver channel outlet of condensation recovering device connects the interface A of chuck layer, another interface B of chuck layer connects nitrogen blow-down pipe, the interface A of interior tube layer connects heat source passages entrance, another interface B of interior tube layer connects the liquid-discharging tube of immersed pump (3), the interface A of chuck layer and the interface A of interior tube layer is positioned at same one end of precooling chuck.
7. adopt a kind of BOG condensate recovery system for LNG gas station as claimed in claim 1 to reclaim the method for BOG, it is characterized in that, LNG liquid in LNG storage tank (1) is sent into BOG condensation recovering device (2) by immersed pump (3), and by the liquid nitrogen introducing BOG condensation recovering device (2), the LNG liquid introduced is cooled, cooled LNG liquid is back to storage tank, and the BOG in cooling storage tank also makes BOG liquefy.
8. the method for recovery BOG according to claim 7, is characterized in that, also comprises adopting carrying out cooled nitrogen continuation to the step of carrying out precooling from immersed pump (3) LNG liquid out to BOG condensation recovering device (2) interior LNG liquid.
9. the method for recovery BOG according to claim 7, it is characterized in that, as temperature-detecting device A(6) when detecting that in storage tank, LNG fluid temperature is higher than setting value, or as pressure-detecting device A(5) when LNG storage tank (1) pressure being detected higher than setting value, control cut-off valve (8) by control system to open, LNG liquid in LNG storage tank (1) is sent into BOG condensation recovering device (2) by immersed pump (3), then opened by control system regulating and controlling valve (9), liquid nitrogen in liquid nitrogen storage device (4) enters BOG condensation recovering device (2), cooling enters the LNG liquid of BOG condensation recovering device (2), as temperature-detecting device B(7) when the temperature of LNG liquid is higher than setting value in the heat source passages outlet of the connection BOG condensation recovering device (2) that detects and the pipeline of LNG storage tank (1), control system regulating and controlling valve (9) aperture becomes greatly, as temperature-detecting device B(7) when the temperature of LNG liquid is lower than setting value in the heat source passages outlet of the connection BOG condensation recovering device (2) that detects and the pipeline of LNG storage tank (1), control system regulating and controlling valve (9) aperture diminishes.As pressure-detecting device A(5) when LNG storage tank (1) pressure being detected lower than setting value, control system closes cut-off valve (8) and modulating valve (9).
10. the method for recovery BOG according to claim 7, it is characterized in that, as pressure-detecting device B(10) when detecting that in nitrogen blow-down pipe, nitrogen pressure is higher than setting value, control system controls Emergeny Cutoff Valves (11) and opens, and nitrogen is by the external emptying of nitrogen discharge device; As pressure-detecting device B(10) when detecting that in nitrogen blow-down pipe, nitrogen pressure is lower than setting value, control system controls Emergeny Cutoff Valves (11) and closes.
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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 |
| 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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| CN101858683A (en) * | 2010-04-30 | 2010-10-13 | 浙江大学 | System for producing liquefied natural gas by utilizing liquid nitrogen cold energy |
| CN102155615A (en) * | 2011-01-24 | 2011-08-17 | 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 |
| CN104390136A (en) * | 2014-11-11 | 2015-03-04 | 南京工业大学 | BOG recovery method and device |
| 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 |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN105864636B (en) * | 2016-05-23 | 2018-11-06 | 唐山市新概念科技有限公司 | LNG filling stations unload without pump, fill, charging system and fill technique |
| 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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