CN105927848A - Small device and method for rapidly re-liquefying and recovering liquefied natural gas vapour - Google Patents

Small device and method for rapidly re-liquefying and recovering liquefied natural gas vapour Download PDF

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Publication number
CN105927848A
CN105927848A CN201610246850.9A CN201610246850A CN105927848A CN 105927848 A CN105927848 A CN 105927848A CN 201610246850 A CN201610246850 A CN 201610246850A CN 105927848 A CN105927848 A CN 105927848A
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China
Prior art keywords
natural gas
storage tank
gas
valve
boil
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CN201610246850.9A
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Chinese (zh)
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CN105927848B (en
Inventor
鲍磊
党文义
王全国
凌晓东
于安峰
武志峰
韩中枢
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China Petroleum and Chemical Corp
Sinopec Qingdao Safety Engineering Institute
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China Petroleum and Chemical Corp
Sinopec Qingdao Safety Engineering Institute
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Classifications

    • 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
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28B—STEAM OR VAPOUR CONDENSERS
    • F28B1/00—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser
    • F28B1/02—Condensers in which the steam or vapour is separate from the cooling medium by walls, e.g. surface condenser using water or other liquid as the cooling medium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28B—STEAM OR VAPOUR CONDENSERS
    • F28B3/00—Condensers in which the steam or vapour comes into direct contact with the cooling medium
    • F28B3/06—Condensers in which the steam or vapour comes into direct contact with the cooling medium by injecting the steam or vapour into the cooling liquid
    • 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
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/01—Shape
    • F17C2201/0147—Shape complex
    • F17C2201/0157—Polygonal
    • 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
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/03—Orientation
    • F17C2201/032—Orientation with substantially vertical main axis
    • 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
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/03—Orientation
    • F17C2201/035—Orientation with substantially horizontal main axis
    • 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
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/05—Size
    • F17C2201/056—Small (<1 m3)
    • 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
    • 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
    • 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
    • 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
    • F17C2225/0107—Single phase
    • F17C2225/0123—Single phase gaseous, e.g. CNG, GNC
    • 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
    • F17C2227/0341—Heat exchange with the fluid by cooling using another fluid
    • F17C2227/0353—Heat exchange with the fluid by cooling using another fluid using cryocooler
    • 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
    • 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
    • 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
    • F17C2265/06—Fluid distribution
    • F17C2265/063—Fluid distribution for supply of refueling stations

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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 a small device for rapidly re-liquefying and recovering liquefied natural gas vapour. The small device comprises a low-temperature liquefied natural gas vapour storage tank, a pressure monitoring device, a control system, a low-temperature refrigerator, a finned condensing heat exchanger, a vacuum heat-insulation storage tank, a coiled tube heat exchanger, a second valve, a vapour inlet pipeline of a liquefied natural gas tank car/ship, a third valve, a vapour inlet pipeline of the liquefied natural gas vapour storage tank, a lower liquid inlet pipeline, an upper spray device, an upper liquid inlet pipeline, the third valve, a fourth valve, a pressure and temperature monitoring device, a fifth valve, a self-pressurization vaporizer and a self-pressurization vapour inlet pipeline.

Description

A kind of quick re-liquefied retracting device of small liquid natural gas boil-off gas and method
Technical field
The present invention relates to technical field of petrochemical industry, particularly relate to a kind of liquefaction sky based on Cryo Refrigerator So re-liquefied retracting device of gas boil-off gas.
Background technology
Liquefied natural gas, as generally acknowledged clean energy resource, has obtained quick development in recent years.Domestic existing Liquefied natural gas filling station more than 2000 seat, unloads at liquefied natural gas, stores, fills, the link such as transport, The heat transmission produced due to the huge temperature difference between ambient temperature and LNG temperature, liquefaction The pre-cooling of natural gas filling station, adjust saturated and other reasons, inevitably produce boil-off gas (BOG).The increase of boil-off gas can make the pressure of system raise, and once pressure exceedes storage tank permission Operating pressure, boil-off gas will be by the discharge decompression such as relief valve；Additionally liquefied natural gas tank car unloads After car, vehicle-mounted pressure of storage tank is generally about 0.6MPa, on liquefied natural gas vehicle before road, needs discharge Boil-off gas in tank car storage tank, to pressure about 0.2-0.3MPa, to avoid liquefied natural gas tank car in fortune The risk of superpressure is there is during defeated.Both the above situation all will result in the substantial amounts of wasting of resources, environment dirt Dye and potential potential safety hazard.The mode processing boil-off gas at present mainly has 2 kinds: one is to evaporate Gas heating compresses, and enters urban pipe network or CNG standard station pipe network；Another kind is by boil-off gas Re-liquefied return in LNG tank, mainly use liquid for boil-off gas is re-liquefied at present Nitrogen liquefaction or nitrogen expansion refrigeration liquefying process flow process.
CN103759496 A provides re-liquefied recovery of a kind of small-sized prizing liquefied natural gas boil-off gas to fill Putting, technology described in above-mentioned Patents can only realize boil-off gas condensation liquefaction more in a small amount, and recovery time Long, it is impossible to the condensation liquefaction again realizing the boil-off gas such as natural gas boil-off gas tank car reclaims.It is natural simultaneously Gas boil-off gas is returned tank and is used gravitational difference form, and for vertical natural gas boil-off gas storage tank, it condenses the day after tomorrow again So gas boil-off gas cannot realize returning tank smoothly.
Summary of the invention
The present invention is aiming at boil-off gas and the liquefied natural gas tank car that liquefied natural gas filling station field exists Unload carrier gas directly discharge cannot the technical problem of efficient recovery, a kind of liquefaction based on Cryo Refrigerator is proposed Natural gas boil-off gas Rapid recovery device.This device has compact conformation, technological process is simple, be prone to Operate and the advantage that boil-off gas quickly reclaims can be realized, it is possible to realizing liquefied natural gas filling station field and steam Get angry body zero-emission and reduce the discharge of liquefied natural gas tank car boil-off gas；Simultaneously can be used for liquefying natural The liquefied natural gas bottle boil-off gas such as gas car/ship reclaim.
Based on this, the present invention provides a kind of quick re-liquefied retracting device of small liquid natural gas boil-off gas, It includes low-temperature liquefaction natural gas storage tank, pressure monitoring device, control system, Cryo Refrigerator, fin Formula condensing heat exchanger, vacuum insulation storage tank, coil heat exchanger, the second valve, liquefied natural gas tank car/ Ship admission line, the 3rd valve, LNG tank admission line, lower feed liquor pipeline, upper spray fill Put, upper feed liquor pipeline, the 3rd valve, the 4th valve, pressure and temp monitoring device, the 5th valve, from Supercharging gasifier and from super charge pipeline.
Described control system is supervised with pressure-detecting device, Cryo Refrigerator, pressure and temp respectively by pipeline Surveying device, the 3rd valve and the 4th valve to be connected, the 3rd valve is by upper feed liquor pipeline and upper spray dress Putting and be connected, the 3rd valve is connected with vacuum insulation storage tank by pipeline, and pressure-detecting device is positioned at low In temperature LNG tank, pressure and temp monitoring device is positioned in vacuum insulation storage tank, Cryo Refrigerator Being connected with finned condensing heat exchanger, finned condensing heat exchanger is positioned at the top of vacuum insulation storage tank, Coil heat exchanger is positioned at the bottom of vacuum insulation storage tank, is positioned at the side of vacuum insulation storage tank from supercharging gasifier Face, is provided with the 5th valve on the connection pipeline from supercharging gasifier and vacuum insulation storage tank, and liquefy sky So gas-tanker/ship admission line is connected to the bottom of vacuum insulation storage tank, liquefied natural gas by the second valve Storage tank admission line is connected with low-temperature liquefaction natural gas storage tank and liquefied natural gas tank car/ship admission line, LNG tank admission line is provided with the second valve, lower feed liquor pipeline natural with low-temperature liquefaction Gas storage tank, vacuum insulation storage tank connect, and the 4th valve is arranged on lower feed liquor pipeline.
The present invention also provides for using the quick re-liquefied retracting device of above-mentioned natural gas vaporization gas to liquefy The method of the quick re-liquefied recovery of natural gas boil-off gas, comprising:
The first step, boil-off gas condenses again；
Second step, boil-off gas reclaims.
The described first step is specifically divided into LNG station field BOG further and condenses flow process and LNG tank car/ship again BOG condenses flow process again, and two flow process switchings use.
Described LNG station field BOG condenses flow process again and is specially boil-off gas in low-temperature liquefaction natural gas storage tank When pressure reaches to a certain degree, by pressure monitoring device, pressure signal is sent to control system, controls System controls to open the second valve, and in storage tank, boil-off gas enters into vacuum insulation storage through coil heat exchanger Tank, opens Cryo Refrigerator simultaneously, and the cold that refrigeration machine produces is derived by finned condensing heat exchanger, Boil-off gas is condensed into low-temperature liquefaction natural gas, is stored in vacuum insulation storage tank.
Described LNG tank car/ship BOG condenses flow process again and specially unloads according to liquefied natural gas tank car/ship Time, in advance reserved enough liquefied natural gas in vacuum insulation storage tank, and open Cryo Refrigerator, will Cryo Refrigerator cold stores with the form of the supercool cold of liquefied natural gas；Unload in liquefied natural gas tank car/ship Car is complete, tank car/ship vapor delivery line is connected with vacuum insulation storage tank tank car/ship admission line, opens One valve, in tank car/ship, boil-off gas enters into vacuum insulation storage tank through coil heat exchanger, owing to existing Enough supercool liquefied natural gas so that boil-off gas liquefies rapidly, simultaneously after entering vacuum insulation storage tank Keeping relatively low pressure in vacuum insulation storage tank, the boil-off gas such as liquefied natural gas tank car/ship can be Persistently be condensed under the effect of pressure reduction liquefaction, it is achieved liquefied natural gas tank car/ship boil-off gas quickly reclaims.
Described second step is specifically divided into further and horizontal recharge flow process and vertical recharge flow process.
Described horizontal flow process of recharging has 2 kinds to enter low-temperature liquefaction natural gas storage tank modes: one is through the Three valves, upper feed liquor pipeline and upper spray equipment, enter low-temperature liquefaction natural gas storage tank, and may utilize Boil-off gas in cold cold energy of liquefied natural gas liquefaction portion storage tank；Reach to reduce further tank inner pressure Purpose；Another kind is from low-temperature liquefaction natural gas storage tank bottom liquid inlet through the 4th valve, lower feed liquor pipeline； This situation occurs mainly in when in low-temperature liquefaction natural gas storage tank, liquefied natural gas is in supercooled state, and When vacuum insulation storage tank inner condensat liquid natural gas temperature is higher, it is possible to decrease Cryo Refrigerator acting consumes. Two kinds of boil-off gas ways of recycling can detect device by pressure monitoring device and pressure and temp and by control be System controls.
Described vertical recharge the flow process condensed liquefaction of specially boil-off gas and become liquefied natural gas, by Five valves, from supercharging gasifier, return in vacuum insulation storage tank from supercharging pipeline, improve vacuum insulation storage Pressure inside the tank to a certain extent, is opened the 4th valve, is entered bottom vertical storage tank through lower feed liquor pipeline, real Existing liquefied natural gas recharges operation.
Beneficial effects of the present invention:
1, this re-liquefied retracting device uses Cryo Refrigerator, can directly utilize low-temperature evaporation gas cold, Avoiding the complicated technique of other liquefaction flow paths, equipment etc., technological process is simple, can make skid, just In operation；
2, this re-liquefied retracting device has the effect of cold-storage, it is possible to achieve boil-off gas quickly reclaims, special It not quickly to reclaim liquefaction natural gas tank car/ship boil-off gas；
3, different boil-off gas can be taked to return tank form according to different liquefied natural gas storage conditions, with Realize minimum power consumption；
4, for different liquefied natural gas yard storage tank form (horizontal, vertical etc.), difference can be taked Boil-off gas recirculation process, the suitability is wide.
Accompanying drawing explanation
Fig. 1 natural gas vaporization based on Cryo Refrigerator gas Rapid recovery device schematic diagram.
Detailed description of the invention
The present invention provides a kind of quick re-liquefied retracting device of small liquid natural gas boil-off gas, and it includes low Temperature LNG tank, pressure monitoring device, control system, Cryo Refrigerator, finned condensation are changed Hot device, vacuum insulation storage tank, coil heat exchanger, the second valve, liquefied natural gas tank car/ship admission line, 3rd valve, LNG tank admission line, lower feed liquor pipeline, upper spray equipment, upper feed tube Line, the 3rd valve, the 4th valve, pressure and temp monitoring device, the 5th valve, from supercharging gasifier and From super charge pipeline.
Described control system is supervised with pressure-detecting device, Cryo Refrigerator, pressure and temp respectively by pipeline Surveying device, the 3rd valve and the 4th valve to be connected, the 3rd valve is by upper feed liquor pipeline and upper spray dress Putting and be connected, the 3rd valve is connected with vacuum insulation storage tank by pipeline, and pressure-detecting device is positioned at low In temperature LNG tank, pressure and temp monitoring device is positioned in vacuum insulation storage tank, Cryo Refrigerator Being connected with finned condensing heat exchanger, finned condensing heat exchanger is positioned at the top of vacuum insulation storage tank, Coil heat exchanger is positioned at the bottom of vacuum insulation storage tank, is positioned at the side of vacuum insulation storage tank from supercharging gasifier Face, is provided with the 5th valve on the connection pipeline from supercharging gasifier and vacuum insulation storage tank, and liquefy sky So gas-tanker/ship admission line is connected to the bottom of vacuum insulation storage tank, liquefied natural gas by the second valve Storage tank admission line is connected with low-temperature liquefaction natural gas storage tank and liquefied natural gas tank car/ship admission line, LNG tank admission line is provided with the second valve, lower feed liquor pipeline natural with low-temperature liquefaction Gas storage tank, vacuum insulation storage tank connect, and the 4th valve is arranged on lower feed liquor pipeline.
The present invention also provides for using the quick re-liquefied retracting device of above-mentioned natural gas vaporization gas to liquefy The method of the quick re-liquefied recovery of natural gas boil-off gas, comprising:
The first step, boil-off gas condenses again；
Second step, boil-off gas reclaims.
The described first step is specially further and uses Cryo Refrigerator as boil-off gas condensation liquefaction again Cold is originated, it is possible to by liquefied natural gas station field evaporation gas or liquefied natural gas tank car boil-off gas bromhidrosis Body fast liquefying reclaims, and the Cryo Refrigerator temperature of employing is low, cold is big, reliable stable, cold end By finned condensing heat exchanger, refrigeration machine low temperature cold is derived, and improve the heat exchange effect of the cold end of refrigeration machine Rate, the boil-off gas under certain pressure enters vacuum insulation storage tank, changes at finned condensing heat exchanger Heat, it is achieved boil-off gas condensation liquefaction again, in order to accelerate boil-off gas condensation liquefaction speed, exhausted in vacuum Reserved a part of supercool liquefied natural gas in hot tank, in boil-off gas and finned condensing heat exchanger heat exchange Before, first pass through coil heat exchanger and carry out precooling treatment with supercool liquefied natural gas.
For boil-off gas in liquefied natural gas tank car/ship, need quickly to reclaim so that liquefied natural gas groove Next step transport of car/ship, needs to unload liquid situation according to tank car and opens Cryo Refrigerator in advance, and vacuum is exhausted In hot tank, liquefied natural gas is set to supercooled state, the most in advance cold-storage, quickly reclaims boil-off gas to meet Demand.
Described second step is specially the recovery of liquefied natural gas station field evaporation gas further and is mainly recycled to liquefaction Natural gas storage tank, the difference of standing form horizontal according to LNG tank, take different recharging Mode.
For horizontal LNG tank, keep vacuum insulation storage tank and low-temperature liquefaction natural gas storage tank it Between certain altitude poor, terminate when boil-off gas condenses again, utilize gravitational difference to be recycled to by liquefied natural gas low Temperature insulated storage tank.
For horizontal LNG tank, boil-off gas returns tank and comprises two kinds of feed liquor modes: one is to work as Re-liquefied liquefied natural gas is in supercooled state, and it is natural that the form sprayed by upper feed liquor returns low-temperature liquefaction Gas storage tank, reduces boil-off gas pressure in storage tank simultaneously；Another kind is when in low-temperature liquefaction natural gas storage tank Liquefied natural gas is in supercooled state, re-liquefied liquefied natural gas can be entered one by the form of lower feed liquor Step cooling, and then reduce the re-liquefied required power consumption of boil-off gas.
For vertical LNG tank, owing to liquefied natural gas liquid level is higher, it is impossible to simple by two tanks Between liquid level difference realize liquefied natural gas backflow, now use from supercharging mode, by vacuum insulation storage tank liter Pressure, overcomes two tank liquid level difference resistances, it is achieved liquefied natural gas reflux operation.
Embodiment and accompanying drawing is below used to describe embodiments of the present invention in detail, whereby to the present invention such as What application technology means solves technical problem, and the process that realizes reaching technique effect can fully understand also Implement according to this.
The quick re-liquefied retracting device of small liquid natural gas boil-off gas of this bright offer, it includes Low Temperature Liquid Change natural gas storage tank 1, pressure monitoring device 2, control system 3, Cryo Refrigerator 4, finned condensation Heat exchanger 5, vacuum insulation storage tank 6, coil heat exchanger the 7, first valve 8, liquefied natural gas tank car/ Ship admission line the 9, second valve 10, LNG tank admission line 11, lower feed liquor pipeline 12, Upper spray equipment 13, upper feed liquor pipeline the 14, the 3rd valve the 15, the 4th valve 16, pressure and temp are monitored Device the 17, the 5th valve 18, from supercharging gasifier 19 with from super charge pipeline 20.
Described control system 3 by cable and holding wire respectively with pressure-detecting device 2, Cryo Refrigerator 4, Pressure and temp monitoring device the 17, the 3rd valve 15 is connected with the 4th valve 16, and the 3rd valve 15 leads to Crossing feed liquor pipeline 14 to be connected with upper spray equipment 13, the 3rd valve 15 is by pipeline and vacuum insulation Storage tank 6 is connected, and pressure-detecting device 2 is positioned in low-temperature liquefaction natural gas storage tank 1, and pressure and temp is supervised Surveying device 17 to be positioned in vacuum insulation storage tank 6, Cryo Refrigerator 4 is connected with finned condensing heat exchanger 5 Connecing, finned condensing heat exchanger 5 is positioned at the top of vacuum insulation storage tank 6, and coil heat exchanger 7 is positioned at very The bottom of empty insulated storage tank 6, is positioned at the side of vacuum insulation storage tank 6 from supercharging gasifier 19, from increasing Pressure gasifier 19 is provided with the 5th valve 18 on the connection pipeline of vacuum insulation storage tank 6, liquefies natural Gas-tanker/ship admission line 9 is connected to the bottom of vacuum insulation storage tank 6 by the second valve 8, and liquefy sky So gas storage tank admission line 11 and low-temperature liquefaction natural gas storage tank 1 and liquefied natural gas tank car/ship air inlet pipe Line 9 is connected, and is provided with the second valve 10, lower feed liquor on LNG tank admission line 11 Pipeline 12 is connected with low-temperature liquefaction natural gas storage tank 1, vacuum insulation storage tank 6, and the 4th valve 16 is installed On lower feed liquor pipeline 12.
Liquefied natural gas station field evaporation gas condenses flow process again: boil-off gas in low-temperature liquefaction natural gas storage tank 1 When body pressure reaches to a certain degree, by pressure monitoring device 2, pressure signal is sent to control system 3, Control system 3 controls to open the second valve 10, and in storage tank, boil-off gas enters into through coil heat exchanger 7 Vacuum insulation storage tank 6, opens Cryo Refrigerator 4 simultaneously, and the cold that refrigeration machine produces is by finned condensation Heat exchanger 5 is derived, and boil-off gas is condensed into low-temperature liquefaction natural gas, is stored in vacuum insulation storage tank 6 In.
Liquefied natural gas tank car/ship boil-off gas condenses flow process again: unload according to liquefied natural gas tank car/ship Time, in advance reserved enough liquefied natural gas in vacuum insulation storage tank 6, and open Cryo Refrigerator 4, Cryo Refrigerator cold is stored with the form of the supercool cold of liquefied natural gas；Deng liquefied natural gas tank car/ Ship is unloaded complete, tank car/ship vapor delivery line is connected with vacuum insulation storage tank tank car/ship admission line 9, Opening valve 8, in tank car/ship, boil-off gas enters into vacuum insulation storage tank 6 through coil heat exchanger 7, Owing to there is enough supercool liquefied natural gas so that boil-off gas is rapid liquid after entering vacuum insulation storage tank Changing, keep relatively low pressure simultaneously in vacuum insulation storage tank 6, liquefied natural gas tank car/ship etc. evaporates Gas persistently can be condensed liquefaction under the effect of pressure reduction, it is achieved liquefied natural gas tank car/ship boil-off gas Quickly reclaim.
Liquefied natural gas returns tank flow process and is divided into and horizontal recharges flow process and vertical flow process of recharging: boil-off gas is through upper State flow process and be condensed into the supercool liquefied natural gas of low temperature, be stored in vacuum insulation storage tank 6.
For horizontal recharge flow process have 2 kinds enter low-temperature liquefaction natural gas storage tank 1 modes: one be through Valve 15, upper feed liquor pipeline 14 and upper spray equipment 13, enter low-temperature liquefaction natural gas storage tank 1, and Boil-off gas in available supercool cold energy of liquefied natural gas liquefaction portion storage tank；Reach to reduce further storage tank The purpose of interior pressure；Another kind is to store up from low-temperature liquefaction natural gas through valve 16, lower feed liquor pipeline 12 Tank 1 bottom liquid inlet；This situation occurs mainly at liquefied natural gas in low-temperature liquefaction natural gas storage tank In supercooled state, and when vacuum insulation storage tank 6 inner condensat liquid natural gas temperature is higher, it is possible to decrease low temperature Refrigeration machine 4 acting consumes.Two kinds of boil-off gas ways of recycling can pass through pressure monitoring device 2 and pressure temperature Degree detection device 17 is controlled by control system 3.
Vertical flow process of recharging: the condensed liquefaction of boil-off gas becomes liquefied natural gas, by valve 18, certainly Supercharging gasifier 19, return in vacuum insulation storage tank 6 from supercharging pipeline 20, improve vacuum insulation storage tank 6 Interior pressure to a certain extent, is opened valve 16, is entered bottom vertical storage tank through lower feed liquor pipeline 12, real Existing liquefied natural gas recharges operation.
All above-mentioned primary implement these intellectual properties, do not set limit other forms enforcement this Plant new product and/or new method.Those skilled in the art will utilize this important information, and foregoing is revised, To realize similar implementation status.But, all modifications or transformation belong to reservation based on new product of the present invention Right.
The above, be only presently preferred embodiments of the present invention, is not that the present invention makees other form Restriction, any those skilled in the art are changed possibly also with the technology contents of the disclosure above Or it is modified as the Equivalent embodiments of equivalent variations.But every without departing from technical solution of the present invention content, depend on Any simple modification, equivalent variations and remodeling above example made according to the technical spirit of the present invention, Still fall within the protection domain of technical solution of the present invention.

Claims (9)

1. the quick re-liquefied retracting device of small liquid natural gas boil-off gas, it is characterised in that: include Low-temperature liquefaction natural gas storage tank, pressure monitoring device, control system, Cryo Refrigerator, finned condensation Heat exchanger, vacuum insulation storage tank, coil heat exchanger, the second valve, liquefied natural gas tank car/ship air inlet pipe Line, the 3rd valve, LNG tank admission line, lower feed liquor pipeline, upper spray equipment, enterprising Liquid pipeline, the 3rd valve, the 4th valve, pressure and temp monitoring device, the 5th valve, from supercharging gasify Device and from super charge pipeline.
2. the quick re-liquefied retracting device of small liquid natural gas boil-off gas as claimed in claim 1, its Be characterised by: described control system by pipeline respectively with pressure-detecting device, Cryo Refrigerator, pressure Device for detecting temperature, the 3rd valve and the 4th valve are connected, the 3rd valve by upper feed liquor pipeline with upper Spray equipment is connected, and the 3rd valve is connected with vacuum insulation storage tank by pipeline, pressure-detecting device Being positioned in low-temperature liquefaction natural gas storage tank, pressure and temp monitoring device is positioned in vacuum insulation storage tank, low temperature Refrigeration machine is connected with finned condensing heat exchanger, and finned condensing heat exchanger is positioned at vacuum insulation storage tank Top, coil heat exchanger is positioned at the bottom of vacuum insulation storage tank, is positioned at vacuum insulation storage from supercharging gasifier The side of tank, is provided with the 5th valve on the connection pipeline from supercharging gasifier and vacuum insulation storage tank, Liquefied natural gas tank car/ship admission line is connected to the bottom of vacuum insulation storage tank by the second valve, liquefaction Natural gas storage tank admission line and low-temperature liquefaction natural gas storage tank and liquefied natural gas tank car/ship admission line It is connected, LNG tank admission line is provided with the second valve, lower feed liquor pipeline and low temperature LNG tank, vacuum insulation storage tank connect, and the 4th valve is arranged on lower feed liquor pipeline.
3. use the quick re-liquefied retracting device of natural gas vaporization gas described in claim 1 or 2 to carry out The method of the quick re-liquefied recovery of natural gas vaporization gas, it is characterised in that including:
The first step, boil-off gas condenses again；
Second step, boil-off gas reclaims.
4. the method for the quick re-liquefied recovery of natural gas vaporization gas as claimed in claim 3, it is special Levy and be: the described first step is specifically divided into LNG station field BOG further and condenses flow process and LNG groove again Car/ship BOG condenses flow process again, and two flow process switchings use.
5. the method for the quick re-liquefied recovery of natural gas vaporization gas as described in claim 3 or 4, It is characterized in that: described LNG station field BOG condenses flow process again and is specially in low-temperature liquefaction natural gas storage tank When boil-off gas pressure reaches to a certain degree, it is sent to control system by pressure signal by pressure monitoring device System, control system controls to open the second valve, and in storage tank, boil-off gas enters into very through coil heat exchanger Empty insulated storage tank, opens Cryo Refrigerator simultaneously, and the cold that refrigeration machine produces is by finned condensing heat-exchange Device is derived, and boil-off gas is condensed into low-temperature liquefaction natural gas, is stored in vacuum insulation storage tank.
6. the method for the quick re-liquefied recovery of natural gas vaporization gas as described in claim 3 to 5, It is characterized in that: described LNG tank car/ship BOG condenses flow process again and is specially according to liquefied natural gas tank car / ship is unloaded the time, in advance reserved enough liquefied natural gas in vacuum insulation storage tank, and opens cryogenic refrigeration Machine, stores Cryo Refrigerator cold with the form of the supercool cold of liquefied natural gas；Deng liquefied natural gas groove Car/ship is unloaded complete, tank car/ship vapor delivery line is connected with vacuum insulation storage tank tank car/ship admission line, Opening the first valve, in tank car/ship, boil-off gas enters into vacuum insulation storage tank through coil heat exchanger, by In there is enough supercool liquefied natural gas so that boil-off gas liquefies rapidly after entering vacuum insulation storage tank, Keeping relatively low pressure in vacuum insulation storage tank, the boil-off gas such as liquefied natural gas tank car/ship can simultaneously With the liquefaction that is persistently condensed under the effect of pressure reduction, it is achieved liquefied natural gas tank car/ship boil-off gas quickly returns Receive.
7. the method for the quick re-liquefied recovery of natural gas vaporization gas as described in claim 3 to 6, It is characterized in that: described second step is specifically divided into further and horizontal recharge flow process and vertical recharge flow process.
8. the method for the quick re-liquefied recovery of natural gas vaporization gas as described in claim 3 to 7, It is characterized in that: described horizontal flow process of recharging has 2 kinds to enter low-temperature liquefaction natural gas storage tank mode: a kind of It is through the 3rd valve, upper feed liquor pipeline and upper spray equipment, enters low-temperature liquefaction natural gas storage tank, and Boil-off gas in available supercool cold energy of liquefied natural gas liquefaction portion storage tank；Reach to reduce further storage tank The purpose of interior pressure；Another kind is from low-temperature liquefaction natural gas storage tank through the 4th valve, lower feed liquor pipeline Bottom liquid inlet；This situation occurs mainly in when in low-temperature liquefaction natural gas storage tank, liquefied natural gas was in Cold state, and when vacuum insulation storage tank inner condensat liquid natural gas temperature is higher, it is possible to decrease Cryo Refrigerator Acting consumes.Two kinds of boil-off gas ways of recycling can be by pressure monitoring device and pressure and temp detection device By control system control.
9. the method for the quick re-liquefied recovery of natural gas vaporization gas as described in claim 3 to 8, It is characterized in that: described vertical recharge the flow process condensed liquefaction of specially boil-off gas and become liquefied natural gas, By the 5th valve, from supercharging gasifier, return in vacuum insulation storage tank from supercharging pipeline, improve vacuum In insulated storage tank, pressure is to a certain extent, opens the 4th valve, at the bottom of lower feed liquor pipeline enters vertical storage tank Portion, it is achieved liquefied natural gas recharges operation.
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CN108254468A (en) * 2018-03-19 2018-07-06 西南石油大学 The device and method of aromatic substance content in a kind of measure natural gas
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CN108870867A (en) * 2018-09-05 2018-11-23 上海宝钢气体有限公司 A kind of liquefying plant and its application method using liquid nitrogen high efficiente callback high value residual air
CN109780424A (en) * 2019-03-05 2019-05-21 江苏鼎程新能源科技有限公司 A kind of split type BOG recyclable device
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CN106439480A (en) * 2016-09-23 2017-02-22 上海昆仑新奥清洁能源股份有限公司 Moving dedicated system adopting natural gas reliquefaction recycling process
CN106287219A (en) * 2016-09-26 2017-01-04 湖北和远气体股份有限公司 A kind of natural gas liquefaction plant BOG recycling system
CN108799823A (en) * 2017-05-02 2018-11-13 中国石油化工股份有限公司 A kind of recycling of On Lng Leakage and boil-off gas retracting device
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CN111918817A (en) * 2018-04-06 2020-11-10 韩国造船海洋株式会社 Gas treatment system and ship comprising same
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CN109780424A (en) * 2019-03-05 2019-05-21 江苏鼎程新能源科技有限公司 A kind of split type BOG recyclable device
CN109798439A (en) * 2019-03-05 2019-05-24 江苏鼎程新能源科技有限公司 A kind of re-liquefied system of BOG
CN112944802A (en) * 2021-04-15 2021-06-11 西南石油大学 Precooling apparatus before filling liquid helium storage tank
CN114659020A (en) * 2022-03-21 2022-06-24 烟台杰瑞石油装备技术有限公司 Liquid nitrogen equipment and control method thereof
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