CN105736936A - Unloading and storing method for liquefied natural gas - Google Patents
Unloading and storing method for liquefied natural gas Download PDFInfo
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- CN105736936A CN105736936A CN201610213123.2A CN201610213123A CN105736936A CN 105736936 A CN105736936 A CN 105736936A CN 201610213123 A CN201610213123 A CN 201610213123A CN 105736936 A CN105736936 A CN 105736936A
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- flash steam
- natural gas
- liquefied natural
- tank
- unloading
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C5/00—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures
- F17C5/02—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures for filling with liquefied gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
- F17C13/025—Special adaptations of indicating, measuring, or monitoring equipment having the pressure as the parameter
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/04—Arrangement or mounting of valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C5/00—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures
- F17C5/06—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures for filling with compressed gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
- F17C7/02—Discharging liquefied gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
- F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
- F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
- F17C2205/0323—Valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2221/00—Handled fluid, in particular type of fluid
- F17C2221/03—Mixtures
- F17C2221/032—Hydrocarbons
- F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
- F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
- F17C2223/0107—Single phase
- F17C2223/0123—Single phase gaseous, e.g. CNG, GNC
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
- F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
- F17C2223/0146—Two-phase
- F17C2223/0153—Liquefied gas, e.g. LPG, GPL
- F17C2223/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2225/00—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel
- F17C2225/01—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel characterised by the phase
- F17C2225/0146—Two-phase
- F17C2225/0153—Liquefied gas, e.g. LPG, GPL
- F17C2225/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
- F17C2227/03—Heat exchange with the fluid
- F17C2227/0302—Heat exchange with the fluid by heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
- F17C2227/03—Heat exchange with the fluid
- F17C2227/0337—Heat exchange with the fluid by cooling
- F17C2227/0339—Heat exchange with the fluid by cooling using the same fluid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
- F17C2227/03—Heat exchange with the fluid
- F17C2227/0367—Localisation of heat exchange
- F17C2227/0369—Localisation of heat exchange in or on a vessel
- F17C2227/0374—Localisation of heat exchange in or on a vessel in the liquid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
- F17C2227/03—Heat exchange with the fluid
- F17C2227/0367—Localisation of heat exchange
- F17C2227/0388—Localisation of heat exchange separate
- F17C2227/039—Localisation of heat exchange separate on the pipes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
- F17C2227/04—Methods for emptying or filling
- F17C2227/041—Methods for emptying or filling vessel by vessel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
- F17C2250/01—Intermediate tanks
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
- F17C2250/04—Indicating or measuring of parameters as input values
- F17C2250/0404—Parameters indicated or measured
- F17C2250/043—Pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
- F17C2250/07—Actions triggered by measured parameters
- F17C2250/072—Action when predefined value is reached
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2265/00—Effects achieved by gas storage or gas handling
- F17C2265/03—Treating the boil-off
- F17C2265/032—Treating the boil-off by recovery
- F17C2265/033—Treating the boil-off by recovery with cooling
- F17C2265/034—Treating the boil-off by recovery with cooling with condensing the gas phase
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2265/00—Effects achieved by gas storage or gas handling
- F17C2265/03—Treating the boil-off
- F17C2265/032—Treating the boil-off by recovery
- F17C2265/036—Treating the boil-off by recovery with heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2265/00—Effects achieved by gas storage or gas handling
- F17C2265/03—Treating the boil-off
- F17C2265/032—Treating the boil-off by recovery
- F17C2265/037—Treating the boil-off by recovery with pressurising
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention provides an unloading and storing method for liquefied natural gas and relates to the field of liquefied natural gas. The unloading and storing method for the liquefied natural gas comprises the steps that first flash steam guided from equipment which is to be added with liquid is heated through a heater; the heated first flash steam is compressed through a compressor; and the compressed first flash steam is guided into a storing and conveying tank so as to enable the pressure intensity in the storing and conveying tank to be increased, and the liquefied natural gas in the storing and conveying tank is compressed and guided into a low-temperature storing tank. According to the provided unloading and storing method for the liquefied natural gas, the liquefied natural gas in the storing and conveying tank can be unloaded and stored through evaporated flash steam in the equipment which is to be added with the liquid, energy source waste and environment pollution are reduced, the operation cost is reduced, and the potential industry risk hidden danger is effectively avoided.
Description
Technical field
The present invention relates to liquefied natural gas field, in particular to the storage method of unloading of a kind of liquefied natural gas.
Background technology
Development along with new-energy automobile, steamer, LNGV, steamer gas station rise just rapidly at home, liquefied natural gas has the clear superiorities such as safety economy, clean and effective environmental protection, efficiency of storage be high as automobile, steamer fuel relative to other conventional automotive fuels, under the call that response national energy-saving reduces discharging, use liquefied natural gas as automobile, steamer alternative fuel, environmental pollution can not only be effectively reduced and alleviate that petroleum resources are in short supply and the pressure that brings, meanwhile, also it is realize sustainable economic development and improve the optimum selection of environment.
nullAt present，For the storage of liquefied natural gas in prior art，Mostly adopt immersed pump that the liquefied natural gas in the accumulating tank on tank car is carried out storage of unloading，Owing to the temperature of liquefied natural gas is relatively low，Unload in the process stored adopting immersed pump to be carried out by the liquefied natural gas in the accumulating tank on tank car，Need that immersed pump is pre-chilled to about-100 could work，Precooling process often to be passed through repeatedly the flash steam (gas that natural gas vaporization is formed，It is called for short BOG flash steam) emptying，In the process of immersed pump pre-cooling，A part of liquefied natural gas vaporization so can be made to become flash steam，Add flash steam produced by vehicle and boats and ships，Although it is re-liquefied that these flash steams can pass through operational outfit，But most flash steam is of a relatively high due to the cost recycled，Therefore and in vain emit，Not only waste the energy，And pollute environment.Meanwhile, the cost of immersed pump is very high, and the condition of properly functioning use requires higher, and maintenance difficulty is big, and current most of low temperature immersed pump depends on a handful of countries' import, there is potential industry risk hidden danger.
Summary of the invention
It is an object of the invention to provide the storage method of unloading of liquefied natural gas, to improve above-mentioned problem.
The present invention is achieved in that
A kind of storage method of unloading of liquefied natural gas, including: will treat, by heater, the first flash steam heating derived in liquid feeding equipment；
Compressor is utilized to be compressed by the first flash steam after heating；
The first flash steam after compression is imported so that the pressure in accumulating tank increases in accumulating tank, and the liquefied natural gas in accumulating tank is pressed in low-temperature storage tank.
The storage method of unloading of liquefied natural gas as above, it is preferable that before the step utilizing compressor to be compressed by the first flash steam after heating, described method also includes:
First flash steam is stored to surge tank；
Compressor is utilized the step that the first flash steam after heating is compressed to be included: to utilize compressor to be compressed by the first flash steam being stored in surge tank.
The storage method of unloading of liquefied natural gas as above, it is preferable that before the step heated by the first flash steam treating to derive in liquid feeding equipment by heater, described method also includes:
By liquid filler to treating liquid feeding equipment adds described first flash steam that liquefied natural gas derivation are treated in liquid feeding equipment.
The storage method of unloading of liquefied natural gas as above, it is preferable that before the first flash steam after compression is imported the step in accumulating tank, described method also includes:
The first flash steam after compression is stored to holding vessel；
Described the first flash steam after compression is imported step in accumulating tank include: the first flash steam being stored in holding vessel is imported in accumulating tank.
The storage method of unloading of liquefied natural gas as above, it is preferable that the step treating the first flash steam heating derived in liquid feeding equipment is included by heater:
To treat that the first flash steam derived in liquid feeding equipment heats to room temperature state by heater.
The storage method of unloading of liquefied natural gas as above, it is preferable that described method also includes:
By the second flash steam heating that the top of low-temperature storage tank is derived by heater；
Compressor is utilized to be compressed by the second flash steam after heating；
The second flash steam after compression is imported from the bottom of low-temperature storage tank, so that the second flash steam after compression is cooled down liquefaction by the liquefied natural gas in low-temperature storage tank.
The storage method of unloading of liquefied natural gas as above, it is preferable that the step that the second flash steam derived at the top of low-temperature storage tank by heater is heated includes:
The second flash steam derived at the top of low-temperature storage tank by heater is heated to room temperature state.
The storage method of unloading of liquefied natural gas as above, it is preferable that before the step utilizing compressor to be compressed by the second flash steam after heating, described method also includes:
Second flash steam is stored to surge tank；
Compressor is utilized the step that the second flash steam after heating is compressed to be included: to utilize compressor to be compressed by the second flash steam being stored in buffer tank.
The storage method of unloading of liquefied natural gas as above, it is preferable that after the step utilizing compressor to be compressed by the second flash steam after heating, described method also includes:
The second flash steam after compression is stored to holding vessel；
The step that the second flash steam after compression imports from the bottom of low-temperature storage tank is included: the second flash steam being stored in holding vessel is imported in low-temperature storage tank from the bottom of low-temperature storage tank.
The storage method of unloading of liquefied natural gas as above, it is preferable that the liquefied natural gas in accumulating tank includes the first liquefied natural gas and the second liquefied natural gas, and described method also includes:
By the first liquefied natural gas vaporization that increased pressure liquefied device will be derived in accumulating tank；
The first liquefied natural gas after vaporization is imported in accumulating tank so that the pressure in accumulating tank increases and is pressed into low-temperature storage tank by the second liquefied natural gas in accumulating tank
For prior art, the storage method of unloading of liquefied natural gas provided by the invention has following beneficial effect:
The storage method of unloading of liquefied natural gas provided by the invention is by treating that in liquid feeding equipment, the flash steam of evaporation derives heating, and be compressed importing by the flash steam after heating by compressor and accumulating tank make the pressure in accumulating tank increase and be pressed in low-temperature storage tank by the liquefied natural gas in accumulating tank, reach liquefied natural gas unload store effect, further, it is also possible to by the flash steam cooling liquid again of evaporation.Compared with prior art, the flash steam in liquid feeding equipment is treated in the repeatable utilization of storage method of unloading of liquefied natural gas provided by the invention, reduces the waste of the energy and the pollution of environment.Meanwhile, compressor can directly adopt the common compressor that room temperature works, convenient for maintaining, and with low cost, can be prevented effectively from potential industry risk hidden danger.
For making the above-mentioned purpose of the present invention, feature and advantage to become apparent, preferred embodiment cited below particularly, and coordinate appended accompanying drawing, it is described in detail below.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, the accompanying drawing used required in embodiment will be briefly described below, it is to be understood that, the following drawings illustrate only certain embodiments of the present invention, therefore the restriction to scope it is not construed as, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other relevant accompanying drawings according to these accompanying drawings.
The liquefied natural gas liquid feeding system structure schematic diagram that Fig. 1 provides for first embodiment of the invention；
The flow chart of the storage method of unloading of the liquefied natural gas that Fig. 2 provides for first embodiment of the invention；
The another liquefied natural gas liquid feeding system structure schematic diagram that Fig. 3 provides for first embodiment of the invention.
Wherein, the corresponding relation between accompanying drawing labelling and component names is as follows:
Low-temperature storage tank 10, liquid filler 20, heater 30, surge tank 40, compressor 50, holding vessel 60, increased pressure liquefied device 70, the first stop valve 101, the second stop valve 102,3rd stop valve 103,4th stop valve 104, the 5th stop valve 105, the 6th stop valve 106,7th stop valve 107,8th stop valve 108, the 9th stop valve 109, the tenth stop valve 110,11st stop valve 111, the 12nd stop valve 112.
Detailed description of the invention
Development along with new-energy automobile, steamer, LNGV, steamer gas station rise just rapidly at home, liquefied natural gas has the clear superiorities such as safety economy, clean and effective environmental protection, efficiency of storage be high as automobile, steamer fuel relative to other conventional automotive fuels, under the call that response national energy-saving reduces discharging, use liquefied natural gas as automobile, steamer alternative fuel, environmental pollution can not only be effectively reduced and alleviate that petroleum resources are in short supply and the pressure that brings, meanwhile, also it is realize sustainable economic development and improve the optimum selection of environment.nullAt present，For the storage of liquefied natural gas in prior art，Mostly adopt immersed pump that the liquefied natural gas in the accumulating tank on tank car is carried out storage of unloading，Owing to the temperature of liquefied natural gas is relatively low，Unload in the process stored adopting immersed pump to be carried out by the liquefied natural gas in the accumulating tank on tank car，Need that immersed pump is pre-chilled to about-100 could work，Precooling process often to be passed through repeatedly the flash steam (gas that natural gas vaporization is formed，It is called for short BOG flash steam) emptying，In the process of immersed pump pre-cooling，A part of liquefied natural gas vaporization so can be made to become flash steam，Add flash steam produced by vehicle and boats and ships，Although it is re-liquefied that these flash steams can pass through operational outfit，But most flash steam is of a relatively high due to the cost recycled，Therefore and in vain emit，Not only waste the energy，And pollute environment.Meanwhile, the cost of immersed pump is very high, and the condition of properly functioning use requires higher, and maintenance difficulty is big, and current most of low temperature immersed pump depends on a handful of countries' import, there is potential industry risk hidden danger.Inventor observes and research discovery through long-term, it is proposed that the storage method of unloading of the liquefied natural gas that the embodiment of the present invention provides.
Below in conjunction with accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.Generally can with various different configurations arrange and design with the assembly of the embodiment of the present invention that illustrate described in accompanying drawing herein.Therefore, below the detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit claimed the scope of the present invention, but is merely representative of the selected embodiment of the present invention.Based on embodiments of the invention, the every other embodiment that those skilled in the art obtain under the premise not making creative work, broadly fall into the scope of protection of the invention.
First embodiment
Refer to Fig. 1, it it is the liquefied natural gas liquid feeding system of the storage method of unloading for realizing liquefied natural gas that the embodiment of the present invention provides, as it is shown in figure 1, this system includes low-temperature storage tank 10, liquid filler 20, heater 30, surge tank 40, compressor 50 and holding vessel 60.Wherein, the direction of arrow in Fig. 1 represents the flow direction of liquid or gas.
Low-temperature storage tank 10 is used for storing liquefied natural gas, connect with the accumulating tank on tank car respectively with top bottom it, and it is arranged to the first stop valve 101 of accumulating tank Yu low-temperature storage tank 10 conduction and cut-off, second stop valve 102 is set between first stop valve 101 and low-temperature storage tank 10 top, between bottom the first stop valve 101 and low-temperature storage tank 10, the 3rd stop valve 103 is set.The bottom of low-temperature storage tank 10 connects with the inlet of liquid filler 20, is arranged between the 4th stop valve 104.Liquid filler 20 adds liquefied natural gas for the fluid reservoir treating liquid feeding equipment, the liquid outlet of liquid filler 20 all connects with the fluid reservoir treating liquid feeding equipment with air inlet, the gas outlet of liquid filler 20 connects with the air inlet of heater 30, has been arranged between the 5th stop valve 105.Heater 30 will be for heating to room temperature by gas, and the gas outlet of heater 30 connects with the air inlet of surge tank 40.Surge tank 40 is used for storing gas, and the gas outlet of surge tank 40 connects with the air inlet of compressor 50, is arranged between the 6th stop valve 106.The gas outlet of compressor 50 connects with the air inlet of holding vessel 60.The gas outlet of holding vessel 60 connects with accumulating tank, the top of low-temperature storage tank 10 and the bottom of low-temperature storage tank 10 respectively, wherein, the 7th stop valve 107 and the 8th stop valve 108 it is provided with between gas outlet and the accumulating tank of holding vessel 60, between 7th stop valve 107 and the bottom of low-temperature storage tank 10, the 9th stop valve 109 is set, between the 7th stop valve 107 and the top of low-temperature storage tank 10, the tenth stop valve 110 is set.The top of low-temperature storage tank 10 connects with the air inlet of heater 30, has been arranged between the 11st stop valve 111.
As in figure 2 it is shown, be the flow chart of the storage method of unloading of the liquefied natural gas being applied to the liquefied natural gas liquid feeding system shown in Fig. 1 that the embodiment of the present invention provides.Idiographic flow shown in Fig. 2 will be described in detail below.
Step S201: by liquid filler to treating that in liquid feeding equipment, the flash steam in liquid feeding equipment is treated in addition liquefied natural gas derivation.
When needing to carry out liquid feeding until liquid feeding equipment, the liquid outlet of liquid filler 20 is connected with the fluid reservoir treating liquid feeding equipment with air inlet, open the 4th stop valve the 104, the 5th stop valve 105, make to treat that the fluid reservoir of liquid feeding equipment and surge tank 40 keep concora crush, liquefied natural gas in low-temperature storage tank 10 enters through liquid filler 20 in the fluid reservoir treating liquid feeding equipment under gravity, and the pressure treating in the fluid reservoir of liquid feeding equipment is increased, treat that in the fluid reservoir of liquid feeding equipment, the flash steam of volatilization is then exported under pressure, is delivered to heater 30 after liquid filler 20.
Step S202: the flash steam heating derived in liquid feeding equipment will be treated by heater.
In fluid reservoir, the flash steam temperature of volatilization is extremely low, and it cannot be compressed by common compressor 50.Therefore, when in the fluid reservoir until liquid feeding equipment, the flash steam of volatilization, then after liquid filler 20, is heated to room temperature state by heater 30, it is ensured that it can be compressed by common compressor 50.
Flash steam heats to room temperature state, is delivered in the surge tank 40 connected with heater 30 and stores.
Step S203: utilize compressor to be compressed by the flash steam after heating.
After surge tank 40 stores a certain amount of flash steam, start compressor 50 and compress it to holding vessel 60 standby, make the pressure in holding vessel 60 meet more than the pressure in the accumulating tank of tank car.
Room temperature it has been previously heated to due to flash steam, therefore compressor 50 adopts the compressor 50 worked under room temperature, and the pipeline between compressor 50 and heater 30 only need to adopt room temperature pipeline, so can effectively reduce the cost of system and easy to maintenance, relatively adopt the mode of immersed pump, it is made without flash steam emptying, it is to avoid the waste of the energy, and effectively prevent the pollution of environment.
In the present embodiment, the start and stop of compressor 50 carry out coordinated signals according to the pressure in surge tank 40.Such as, the startup of compressor 50 and stop carrying out Based Intelligent Control by being connected with intelligent terminal's (such as computer, industrial computer etc.).Concrete, at surge tank 40 place, one pressure transducer is set, pressure transducer and compressor 50 are connected with intelligent terminal's signal each through holding wire, pressure signal in pressure transducer detection surge tank 40, and feed back to intelligent terminal, when pressure is more than when setting upper threshold, intelligent terminal controls compressor 50 and starts and the flash steam in surge tank 40 is compressed, when pressure is less than, when setting bottom threshold, controlling compressor 50 and stop.
Step S204: the flash steam after compression is imported in accumulating tank so that the pressure in accumulating tank increases and is pressed into low-temperature storage tank by the liquefied natural gas in accumulating tank.
When the liquefied natural gas that tank car transport comes needs to unload, the accumulating tank of tank car is connected by conduit with low-temperature storage tank 10 and holding vessel 60 respectively, the mode of connection refers to Fig. 1, open the first stop valve 101, second stop valve 102 (or the 3rd stop valve 103), 7th stop valve 107 and the 8th stop valve 108, owing to the pressure in holding vessel 60 is more than the pressure in the accumulating tank of tank car, therefore the pressure that the flash steam in holding vessel 60 is entered by holding vessel 60 in the accumulating tank making tank car in the accumulating tank of tank car increases, and the liquefied natural gas in accumulating tank is pressed into the storage of unloading realizing liquefied natural gas to low-temperature storage tank 10.
Liquefied natural gas in low-temperature storage tank 10 is along with the prolongation of resting period, and the partial liquefaction natural gas in low-temperature storage tank 10 can be vaporized gradually and be made the pressure in low-temperature storage tank 10 increase.Therefore, the embodiment of the present invention further provides on above-mentioned basis and the flash steam of vaporization in low-temperature storage tank 10 is carried out re-liquefied method.
Concrete, when the pressure in low-temperature storage tank 10 is more than the pressure upper limit set, open the 11st stop valve the 111, the 5th stop valve the 105, the 6th stop valve the 106, the 7th stop valve 107 and the 9th stop valve 109, low-temperature storage tank 10 and holding vessel 60 keep concora crush.Now, flash steam in low-temperature storage tank 10 enters be heated to room temperature in heater 30 from its top along the 11st stop valve 111 and the 5th stop valve 105, subsequently in surge tank 40, start compressor 50, flash steam in surge tank 40 is compressed in holding vessel 60, the pressure in holding vessel 60 is made to increase, open the 7th stop valve 107 and the 9th stop valve 109, flash steam in holding vessel 60 enters in low-temperature storage tank 10 through the 7th stop valve 107 and the 9th stop valve 109 from the bottom of low-temperature storage tank 10, when flash steam enters low-temperature storage tank 10 from the bottom of low-temperature storage tank 10, liquefaction can be cooled down by the liquefied natural gas bottom low-temperature storage tank 10.
By the way, can be re-liquefied by flash steam too much in low-temperature storage tank 10, effectively reduce the content of flash steam in low-temperature storage tank 10, reduce energy waste.
It addition, the embodiment of the present invention can also realize the storage of unloading of liquefied natural gas by the liquefied natural gas vaporization of self in the accumulating tank of tank car.As shown in Figure 3, when adopting in this way, increased pressure liquefied device the 70 and the 12nd stop valve 112 need to be set up in liquefied natural gas liquid feeding system, the inlet of increased pressure liquefied device 70 is connected between the 8th stop valve 108 and the 7th stop valve 107, and the gas outlet of increased pressure liquefied device 70 is then connected with the accumulating tank of tank car by the 12nd stop valve 112.
When need to carry out the liquefied natural gas in accumulating tank to unload storage time, open the first stop valve the 101, the 3rd stop valve 103 (or second stop valve 102), the 8th stop valve the 108 and the 12nd stop valve 112, and start increased pressure liquefied device 70, partial liquefaction natural gas in accumulating tank is transmitted back in accumulating tank after entering in increased pressure liquefied device 70 and being vaporized, owing to after liquefied natural gas vaporization, volume increases, pressure in accumulating tank is increased, and then liquefied natural gas in accumulating tank is delivered in low-temperature storage tank 10.
In describing the invention, in addition it is also necessary to explanation, unless otherwise clearly defined and limited, term " setting ", " installation ", " being connected ", " connection " should be interpreted broadly, for instance, it is possible to it is fixing connection, can also be removably connect, or connect integratedly；Can be mechanically connected, it is also possible to be electrical connection；Can be joined directly together, it is also possible to be indirectly connected to by intermediary, it is possible to be the connection of two element internals.For the ordinary skill in the art, it is possible to concrete condition understands above-mentioned term concrete meaning in the present invention.
It should also be noted that similar label and letter below figure represent similar terms, therefore, once a certain Xiang Yi accompanying drawing is defined, then it need not be carried out definition further and explain in accompanying drawing subsequently.
In describing the invention, it should be noted that, term " " center ", " on ", D score, " left side ", " right side ", " vertically ", " level ", " interior ", orientation or the position relationship of the instruction such as " outward " are based on orientation shown in the drawings or position relationship, or this invention product orientation usually put or position relationship when using, it is for only for ease of the description present invention and simplifies description, rather than the device of instruction or hint indication or element must have specific orientation, with specific azimuth configuration and operation, therefore it is not considered as limiting the invention.Additionally, term " first ", " second ", " the 3rd " etc. are only used for distinguishing description, and it is not intended that indicate or hint relative importance.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, any amendment of making, equivalent replacement, improvement etc., should be included within protection scope of the present invention.
Claims (10)
1. the storage method of unloading of a liquefied natural gas, it is characterised in that including:
The the first flash steam heating derived in liquid feeding equipment will be treated by heater；
Compressor is utilized to be compressed by the first flash steam after heating；
The first flash steam after compression is imported so that the pressure in accumulating tank increases in accumulating tank, and the liquefied natural gas in accumulating tank is pressed in low-temperature storage tank.
2. the storage method of unloading of liquefied natural gas according to claim 1, it is characterised in that before the step utilizing compressor to be compressed by the first flash steam after heating, described method also includes:
First flash steam is stored to surge tank；
Compressor is utilized the step that the first flash steam after heating is compressed to be included: to utilize compressor to be compressed by the first flash steam being stored in surge tank.
3. the storage method of unloading of liquefied natural gas according to claim 2, it is characterised in that before the step heated by the first flash steam treating to derive in liquid feeding equipment by heater, described method also includes:
By liquid filler to treating liquid feeding equipment adds described first flash steam that liquefied natural gas derivation are treated in liquid feeding equipment.
4. the storage method of unloading of liquefied natural gas according to claim 1, it is characterised in that before the first flash steam after compression is imported the step in accumulating tank, described method also includes:
The first flash steam after compression is stored to holding vessel；
Described the first flash steam after compression is imported step in accumulating tank include: the first flash steam being stored in holding vessel is imported in accumulating tank.
5. the storage method of unloading of liquefied natural gas according to claim 1, it is characterised in that the step treating the first flash steam heating derived in liquid feeding equipment is included by heater:
To treat that the first flash steam derived in liquid feeding equipment heats to room temperature state by heater.
6. the storage method of unloading of liquefied natural gas according to claim 1, it is characterised in that described method also includes:
By the second flash steam heating that the top of low-temperature storage tank is derived by heater；
Compressor is utilized to be compressed by the second flash steam after heating；
The second flash steam after compression is imported from the bottom of low-temperature storage tank, so that the second flash steam after compression is cooled down liquefaction by the liquefied natural gas in low-temperature storage tank.
7. the storage method of unloading of liquefied natural gas according to claim 6, it is characterised in that the step that the second flash steam derived at the top of low-temperature storage tank by heater is heated includes:
The second flash steam derived at the top of low-temperature storage tank by heater is heated to room temperature state.
8. the storage method of unloading of liquefied natural gas according to claim 6, it is characterised in that before the step utilizing compressor to be compressed by the second flash steam after heating, described method also includes:
Second flash steam is stored to surge tank；
Compressor is utilized the step that the second flash steam after heating is compressed to be included: to utilize compressor to be compressed by the second flash steam being stored in buffer tank.
9. the storage method of unloading of liquefied natural gas according to claim 6, it is characterised in that after the step utilizing compressor to be compressed by the second flash steam after heating, described method also includes:
The second flash steam after compression is stored to holding vessel；
The step that the second flash steam after compression imports from the bottom of low-temperature storage tank is included: the second flash steam being stored in holding vessel is imported in low-temperature storage tank from the bottom of low-temperature storage tank.
10. the storage method of unloading of liquefied natural gas according to claim 1, it is characterised in that the liquefied natural gas in accumulating tank includes the first liquefied natural gas and the second liquefied natural gas, and described method also includes:
By the first liquefied natural gas vaporization that increased pressure liquefied device will be derived in accumulating tank；
The first liquefied natural gas after vaporization is imported in accumulating tank so that the pressure in accumulating tank increases and is pressed into low-temperature storage tank by the second liquefied natural gas in accumulating tank.
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| CN201610213123.2A CN105736936A (en) | 2016-04-07 | 2016-04-07 | Unloading and storing method for liquefied natural gas |
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| CN106247160A (en) * | 2016-08-10 | 2016-12-21 | 日照海达尔加气设备有限公司 | A kind of nothing discharge LNG aerator and method adding gas tank with high pressure |
| CN106287202A (en) * | 2016-08-10 | 2017-01-04 | 日照海达尔加气设备有限公司 | A kind of storage tank reclaims BOG without discharge LNG aerator and method |
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| CN111503510A (en) * | 2019-01-31 | 2020-08-07 | 乔治洛德方法研究和开发液化空气有限公司 | Method and device for filling a storage container with liquefied gas |
| CN112796982A (en) * | 2021-03-24 | 2021-05-14 | 刘沿霏 | Natural gas compression equipment |
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