CN106917957B - A kind of BOG recovery systems of LNG storage tank - Google Patents

A kind of BOG recovery systems of LNG storage tank Download PDF

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Publication number
CN106917957B
CN106917957B CN201610566462.9A CN201610566462A CN106917957B CN 106917957 B CN106917957 B CN 106917957B CN 201610566462 A CN201610566462 A CN 201610566462A CN 106917957 B CN106917957 B CN 106917957B
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China
Prior art keywords
pipeline
valve
bog
heavy hydrocarbon
storage tank
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CN201610566462.9A
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CN106917957A (en
Inventor
胡恒进
魏斌
耿安杰
秦玉泉
胡敏
李永冲
王莹
曹东格
赵征远
丁宁
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Shaanxi Lng Investment & Development Co Ltd
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Shaanxi Lng Investment & Development Co Ltd
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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
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • 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
    • 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
    • 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
    • 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
    • F17C2205/0352—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
    • 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
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/06—Controlling or regulating of parameters as output values
    • F17C2250/0605—Parameters
    • 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
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/04—Reducing risks and environmental impact
    • F17C2260/044—Avoiding pollution or contamination
    • 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
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/04—Reducing risks and environmental impact
    • F17C2260/046—Enhancing energy recovery

Abstract

The present invention relates to a kind of BOG recovery systems of LNG storage tank, including LNG storage tank, BOG attemperators, BOG compressors, feed gas compressor, de- heavy hydrocarbon system, outside ductwork, liquefaction system and unstripped gas source, LNG storage tank is connected with BOG attemperators, BOG compressors, feed gas compressor, de- heavy hydrocarbon system, liquefaction system, LNG storage tank by pipeline successively, forms a closed-loop path.The outlet in unstripped gas source and the entrance of feed gas compressor are connected by pipeline, 4th pipeline of de- heavy hydrocarbon system and the entrance of outside ductwork are connected by the 5th pipeline, 4th pipeline of de- heavy hydrocarbon system and the entrance of feed gas compressor are connected by the 6th pipeline, 5th pipeline and the 6th pipeline connection, the outlet of BOG compressors are connected with the 6th pipeline by the 7th pipeline.The present invention utilizes the existing pipeline of factory, realizes the outer defeated utilization of BOG gases, can reduce Enterprise Construction cost, improve the utilization rate of resource, reduce the pollution to environment, reduce potential safety hazard.

Description

A kind of BOG recovery systems of LNG storage tank
Technical field
The present invention relates to a kind of recovery system for liquefied natural gas LNG, more particularly to a kind of liquefied natural gas LNG to store up The BOG recovery systems of tank.
Background technology
Liquefied natural gas LNG has the advantages such as cleanliness without any pollution, has obtained extensive utilization at present.LNG liquefaction production dresses Put during normal operation and the normal lay days of LNG loading stations can all produce flashed vapour BOG, when LNG is liquefying process units just Often during operation, BOG gases can be changed into LNG again, return to LNG storage tank, realize the recycling of BOG gases.But when LNG liquefies During process units stops production, including LNG liquefaction process units failures stop production and gasification installation starts emergency peak regulation and returns defeated period, BOG gases can not utilize, and after the carrying capacity beyond LNG storage tank, can only largely be emitted into the burning of torch high point, cause pure The waste of net BOG gas resources, the production efficiency of factory is influenceed, reduce the income of company to a certain extent；BOG gases The gases such as CO, CO2 can be produced during burning, environment is polluted；Also cause potential safety hazard to factory simultaneously.
The content of the invention
For waste, pollution environment and the safety of BOG gas resources during overcoming existing LNG liquefaction process units stopping production The problem of hidden danger, the invention provides a kind of BOG recovery systems of LNG storage tank.
In order to solve the above technical problems, the present invention uses following technical scheme：
A kind of BOG recovery systems of LNG storage tank, including the compression of LNG storage tank, BOG attemperators, BOG compressors, unstripped gas Machine, de- heavy hydrocarbon system, liquefaction system, outside ductwork and unstripped gas source, a gaseous phase outlet and the BOG attemperators of LNG storage tank Entrance is connected by pipeline, and a liquid-phase outlet of LNG storage tank is connected with the entrance of BOG attemperators by pipeline, BOG attemperators Outlet be connected with the entrance of BOG compressors by pipeline, the outlet of BOG compressors and the entrance of feed gas compressor pass through One pipeline connects, and is provided with the first valve on the first pipeline, the outlet in unstripped gas source and the entrance of feed gas compressor pass through Pipeline is connected, and the outlet of feed gas compressor is connected with the 13rd pipeline of de- heavy hydrocarbon system by pipeline, takes off heavy hydrocarbon system The entrance of 12nd pipeline and liquefaction system is connected by the second pipeline, and the outlet of liquefaction system and the entrance of LNG storage tank pass through Pipeline connects, and the second pipeline and regeneration gas source pipeline connection, regeneration gas source pipeline and the 8th pipeline of de- heavy hydrocarbon system lead to Pipeline connection is crossed, the 4th pipeline of de- heavy hydrocarbon system and the entrance of outside ductwork connects by the 5th pipeline, and the of de- heavy hydrocarbon system The entrance of four pipelines and feed gas compressor is connected by the 6th pipeline, the 5th pipeline and the 6th pipeline connection, BOG compressors Outlet is connected with the 6th pipeline by the 7th pipeline, and the 8th valve and the 9th valve are provided with the 7th pipeline.
Further, 8 word blind plates are provided with the 7th pipeline, 8 word blind plates are arranged between the 8th valve and the 9th valve.
Further, showering guilding valve is provided with the 7th pipeline, showering guilding valve is arranged between the 8th valve and the 9th valve.
Further, it is provided with flowmeter on the 7th pipeline.
The beneficial effects of the invention are as follows：
De- heavy hydrocarbon system is system present in LNG liquefaction process units, during LNG liquefaction process units stops production, is taken off Heavy hydrocarbon system is out of service, and the pipeline of de- heavy hydrocarbon system is in idle state.The present invention provides a kind of BOG recovery of LNG storage tank System, during LNG liquefaction process units stops production, BOG gases are conveyed by taking off the pipeline of heavy hydrocarbon system to outside ductwork, utilized Already present pipeline in LNG liquefaction process units, improves the utilization rate of pipeline, saves construction cost；BOG gases are inputted To outside ductwork, substantial amounts of source of the gas is supplemented for outside ductwork system, improves the utilization rate of BOG gas resources, to a certain extent The production efficiency of company and the income of company are improved, reduces the pollution level to environment, while reduce potential safety hazard.
8 word blind plates are provided with 7th pipeline, 8 word blind plates are in blind shape when LNG liquefies process units normal operation State, can be completely isolated by BOG compressors and de- heavy hydrocarbon system；When LNG liquefaction process units stops production, 8 word blind plates are in logical State, realize that BOG compressors pass through the 6th pipeline connection of the 7th pipeline and de- heavy hydrocarbon system.
Showering guilding valve is provided with 7th pipeline, when BOG gases way of recycling switches, air can be mixed into the 7th pipeline, The requirement that the oxygen content in the 7th pipeline is less than 1% can be realized by the use of showering guilding valve.
Flowmeter is provided with 7th pipeline, for recording the specific tolerance of BOG gases conveying, is realized to conveying tolerance Monitoring in real time.
Brief description of the drawings
Fig. 1 is a kind of schematic diagram of the BOG recovery systems of LNG storage tank provided by the invention；
Fig. 2 is the schematic diagram that heavy hydrocarbon system is taken off in the present invention；
Wherein,
1-LNG storage tank 2-BOG attemperator 3-BOG compressor 4- feed gas compressors
5- takes off heavy hydrocarbon system 6- liquefaction system 7- outside ductwork 8- unstripped gas source
9- flowmeter 10-8 word blind plate 11- heaters
A1- gaseous phase outlet A2- liquid-phase outlet A3- entrances
The pipelines of C1- the first pipeline C2- the second pipeline C3- regeneration gases source pipeline C4- the 4th
The pipelines of the 6th the 7th pipeline C8- of pipeline C7- of the 5th pipeline C6- of C5- the 8th
The pipelines of the tenth the 11st pipeline C12- of pipeline C11- of the 9th pipeline C10- of C9- the 12nd
The pipelines of C13- the 13rd
The valves of the 3rd valve V4- of V1- the first valve V2- the second valve V3- the 4th
The valves of the 6th the 7th valve V8- of valve V7- of the 5th valve V6- of V5- the 8th
The valves of the tenth the 11st valve V12- of valve V11- of the 9th valve V10- of V9- the 12nd
The valves of the 14th the 15th valve V16- of valve V15- of the 13rd valve V14- of V13- the 16th
The valves of the 17th the 18th valve V19- of valve V18- of V17- the 19th
The check-valves of SV1- first check-valve SV2- second check-valves SV3- the 3rd
PV- showering guilding valves
T1- first takes off heavy hydrocarbon tower group T2- second and takes off heavy hydrocarbon tower group
Embodiment
With reference to shown in Fig. 1 and Fig. 2, a kind of BOG recovery systems of LNG storage tank, including LNG storage tank 1, BOG attemperators 2, BOG Compressor 3, feed gas compressor 4, de- heavy hydrocarbon system 5, liquefaction system 6, outside ductwork 7 and unstripped gas source 8, the one of LNG storage tank 1 Bar gaseous phase outlet A1 is connected with the entrance of BOG attemperators 2 by pipeline, a liquid-phase outlet A2 and the BOG desuperheats of LNG storage tank 1 The entrance of device 2 is connected by pipeline, and the outlet of BOG attemperators 2 is connected with the entrance of BOG compressors 3 by pipeline, BOG compressions The outlet of machine 3 is connected with the entrance of feed gas compressor 4 by the first pipeline C1, and the first valve is provided with the first pipeline C1 V1, the outlet in unstripped gas source 8 are connected with the entrance of feed gas compressor 4 by pipeline, and the outlet of feed gas compressor 4 is with taking off 13rd pipeline C13 of heavy hydrocarbon system 5 is connected by pipeline, takes off the 12nd pipeline C12 and liquefaction system 6 of heavy hydrocarbon system 5 Entrance is connected by the second pipeline C2 connections, the outlet of liquefaction system 6 with the entrance A3 of LNG storage tank 1 by pipeline, the second pipeline C2 is connected with regeneration gas source pipeline C3, and regeneration gas source pipeline C3 and the 8th pipeline C8 of de- heavy hydrocarbon system 5 are connected by pipeline Connect, the 4th pipeline C4 of de- heavy hydrocarbon system 5 is connected with the entrance of outside ductwork 7 by the 5th pipeline C5, takes off the 4th of heavy hydrocarbon system 5 Pipeline C4 is connected with the entrance of feed gas compressor 4 by the 6th pipeline C6, the 5th pipeline C5 and the 6th pipeline C6 connections, BOG The outlet of compressor 3 is connected with the 6th pipeline C6 by the 7th pipeline C7, and the 8th valve V8 and are provided with the 7th pipeline C7 Nine valve V9.
Be provided with 8 word blind plates 10 on 7th pipeline C7,8 word blind plates 10 be arranged on the 8th valve V8 and the 9th valve V9 it Between.
Showering guilding valve PV is provided with 7th pipeline C7, showering guilding valve PV is arranged between the 8th valve V8 and the 9th valve V9.
Flowmeter 9 is provided with 7th pipeline C7.
First valve V1 downstream is provided with first check-valve SV1, and the second valve V2 downstream is provided with second check-valve SV2, the 3rd valve V3 downstream are provided with check-valves SV3.
De- heavy hydrocarbon system 5 is including the de- heavy hydrocarbon tower group T2 of the de- heavy hydrocarbon tower group T1 and second of heater 11, first and accordingly Pipeline and valve, the first de- heavy hydrocarbon tower group T1 and second take off heavy hydrocarbon tower group T2 arranged in parallel, each de- heavy hydrocarbon taken off in heavy hydrocarbon group The quantity of tower is more than or equal to 1.Regeneration gas source pipeline C3 is by being divided into the pipes of the 9th pipeline C9 and the tenth after the 4th valve V4 The parallel branches of road C10 two, the tenth valve V10 and heater 11 are set gradually on the 9th pipeline C9, is provided with the tenth pipeline C10 11st valve V11, subsequent 9th pipeline C9 and the tenth pipeline C10 parallel pipeline are connected with the 11st pipeline C11, and subsequent 11 pipeline C11 are divided into two parallel branches, and the 12nd valve V12, the first de- heavy hydrocarbon tower group are disposed with tie point T1, the 14th valve V14, the 13rd valve V13, the second de- heavy hydrocarbon tower group T2, the 15th valve are disposed with the second branch road Door V15, subsequent two parallel branch collect as the 4th pipeline C4, are provided with the 7th valve V7 on the 4th pipeline C4, and the subsequent 4th Pipeline C4 is divided into two branch roads of the 5th pipeline C5 and the 6th pipeline C6 again, and the 5th pipeline C5 passes through the 5th valve V5 and outside ductwork 7 entrance is connected, and the 6th pipeline C6 enters the entrance of feed gas compressor 4 by the 6th valve V6, the 3rd valve V3.Unstripped gas The outlet of compressor 4 is connected with the 13rd pipeline C13 of de- heavy hydrocarbon system 5, and subsequent 13rd pipeline C13 is divided into two branch in parallel Road, the 18th valve V18, the first de- heavy hydrocarbon tower group T1, the 16th valve V16, the second branch road are disposed with tie point On be disposed with the 19th valve V19, the second de- heavy hydrocarbon tower group T2, the 17th valve V17, two branch roads collect as the 12nd Pipeline C12, the 12nd pipeline C12 connect with the second pipeline C2.
A kind of BOG recovery systems of LNG storage tank provided by the invention liquefy under process units accidental conditions in LNG Concrete operations are as follows：
The now normal operation of feed gas compressor 4, the normal operation of heavy hydrocarbon system 5 is taken off, opens the first valve V1, the second valve V2, the 3rd valve V3, the 4th valve V4, the 7th valve V7, first check-valve SV1, second check-valve SV2, the 3rd check-valves SV3 With heater 11, close the 8th valve V8, the 9th valve V9, remaining valve state see below on the first de- heavy hydrocarbon tower group T1 In concrete operations with the second de- heavy hydrocarbon tower group T2 absorption, regeneration and cooling.
BOG gases caused by LNG storage tank 1 enter BOG attemperators 2, LNG storages by the gaseous phase outlet A1 in LNG storage tank 1 LNG liquid in tank 1 enters BOG attemperators 2 by the liquid-phase outlet A2 in LNG storage tank 1, and BOG gases and LNG liquid exist Mixed in BOG attemperators 2, the BOG gases that temperature reduces are formed, after being compressed by BOG compressors 3, and from raw material The unstripped gas in gas source 8 is compressed into feed gas compressor 4 together, then laggard after decarburization, dewater treatment Enter de- heavy hydrocarbon system 5, liquefied after then being handled by demercuration into liquefaction system 6, become to return to LNG storages after LNG Tank 1, realize the recycling of BOG gases.
The normal operation of heavy hydrocarbon system 5 is now taken off, the first de- heavy hydrocarbon tower group T1 and second takes off heavy hydrocarbon tower group T2 and alternately inhaled Attached and re-generatively cooled, the absorption of a de- heavy hydrocarbon tower group and the re-generatively cooled of another de- heavy hydrocarbon tower group are carried out simultaneously.
When first de- heavy hydrocarbon tower group T1 is adsorbed, the second de- heavy hydrocarbon tower group T2 is regenerated and cooled down, the first de- heavy hydrocarbon Regenerated during tower group T1 absorption with the second de- heavy hydrocarbon tower group T2 and cool down while carry out, concrete operations are as follows：
First de- heavy hydrocarbon tower group T1 absorption：Open the 13rd valve V13, the 15th valve V15, the 16th valve V16, 18th valve V18, the 12nd valve V12, the 14th valve V14, the 17th valve V17, the 19th valve V19 are closed, this When the 5th valve V5, the 6th valve V6, the tenth valve V10, the 11st valve V11 state see below in the second de- heavy hydrocarbon tower group The concrete operations of T2 regeneration and cooling.Gas from feed gas compressor 4 is by decarburization, after dewater treatment, into the 13 pipeline C13, then in turn through by the 18th valve V18, the first de- heavy hydrocarbon tower group T1, the 16th valve V16, into the 12 pipeline C12, enter the second pipeline C2 for removing liquefaction system 6 after being handled by demercuration, complete the first de- heavy hydrocarbon tower group T1 Absorption.
Second de- heavy hydrocarbon tower group T2 regeneration：Open the tenth valve V10, the 5th valve V5, close the 11st valve V11, 6th valve V6, now the 13rd valve V13, the 15th valve V15, the 16th valve V16, the 18th valve V18 are in and beaten Open state, the 12nd valve V12, the 14th valve V14, the 17th valve V17, the 19th valve V19 are closed, and are come From regeneration gas source pipeline C3 cold renewal gas successively by the 4th valve V4, the 8th pipeline C8, the tenth valve V10, by adding After hot device 11 heats, become hot recycling gas, successively by the 11st pipeline C11, the 13rd valve V13, the second de- heavy hydrocarbon tower group T2, the 15th valve V15, the 4th pipeline C4, then enter outside ductwork 7 by the 5th pipeline C5, complete the second de- heavy hydrocarbon tower group T2 regeneration.
Second de- heavy hydrocarbon tower group T2 cooling：After second de- heavy hydrocarbon tower group T2 regeneration is qualified, the tenth valve V10, the are closed Five valve V5, the 11st valve V11, the 6th valve V6 are opened, now the 13rd valve V13, the 15th valve V15, the 16th Valve V16, the 18th valve V18 are in open mode, the 12nd valve V12, the 14th valve V14, the 17th valve V17, 19th valve V19 is closed, and the cold renewal gas from regeneration gas source pipeline C3 is by the 4th valve V4, the 8th pipe Road C8, the tenth pipeline C10, the 11st pipeline C11, the 13rd valve V13, the second de- heavy hydrocarbon tower group T2, the 15th valve V15, 4th pipeline C4, the entrance of feed gas compressor -4 then is returned to by the 6th pipeline C6, complete the cold of the second de- heavy hydrocarbon tower group T2 But.
When second de- heavy hydrocarbon tower group T2 is adsorbed, the first de- heavy hydrocarbon tower group T1 is regenerated and cooled down, the second de- heavy hydrocarbon Regenerated during tower group T2 absorption with the first de- heavy hydrocarbon tower group T1 and cool down while carry out, concrete operations are as follows：
Second de- heavy hydrocarbon tower group T2 absorption：Close the 13rd valve V13, the 15th valve V15, the 16th valve V16, 18th valve V18, the 12nd valve V12, the 14th valve V14, the 17th valve V17, the 19th valve V19 are opened, this When the 5th valve V5, the 6th valve V6, the tenth valve V10, the 11st valve V11 state see below in the first de- heavy hydrocarbon tower group The concrete operations of T1 regeneration and cooling.Gas from feed gas compressor 4 is by decarburization, after dewater treatment, into the 13 pipeline C13, then in turn through by the 19th valve V19, the second de- heavy hydrocarbon tower group T2, the 17th valve V17, into the 12 pipeline C12, enter the second pipeline C2 for removing liquefaction system 6 after being handled by demercuration, complete the second de- heavy hydrocarbon tower group T2 Absorption.
First de- heavy hydrocarbon tower group T1 regeneration：Open the tenth valve V10, the 5th valve V5, close the 11st valve V11, 6th valve V6, now the 13rd valve V13, the 15th valve V15, the 16th valve V16, the 18th valve V18, which are in, closes Closed state, the 12nd valve V12, the 14th valve V14, the 17th valve V17, the 19th valve V19 are in open mode, come From regeneration gas source pipeline C3 cold renewal gas successively by the 4th valve V4, the 8th pipeline C8, the tenth valve V10, by adding After hot device 11 heats, become hot recycling gas, successively by the 11st pipeline C11, the 12nd valve V12, the first de- heavy hydrocarbon tower group T1, the 14th valve V14, the 4th pipeline C4, then enter outside ductwork 7 by the 5th pipeline C5, complete the first de- heavy hydrocarbon tower group T1 regeneration.
First de- heavy hydrocarbon tower group T1 cooling：After de- heavy hydrocarbon tower group T1 regeneration is qualified, the tenth valve V10, the 5th valve are closed Door V5, opens the 11st valve V11, the 6th valve V6, now the 13rd valve V13, the 15th valve V15, the 16th valve V16, the 18th valve V18 are closed, the 12nd valve V12, the 14th valve V14, the 17th valve V17, the tenth Nine valve V19 are in open mode, and the cold renewal gas from regeneration gas source pipeline C3 is by the 4th valve V4, the 8th pipeline C8, the tenth pipeline C10, the 11st pipeline C11, the 12nd valve V12, the first de- heavy hydrocarbon tower group T1, the 14th valve V14, the Four pipeline C4, the entrance of feed gas compressor 4 then is returned to by the 6th pipeline C6, complete the first de- heavy hydrocarbon tower group T1 cooling.
A kind of BOG recovery systems of LNG storage tank provided by the invention liquefy specific under process units stopping production operating mode in LNG Operation is as follows：
Now feed gas compressor 4 can not be run, and de- heavy hydrocarbon system 5 is out of service, opens the 5th valve V5, the 6th valve V6, the 8th valve V8, the 9th valve V9, close the first valve V1, the second valve V2, the 3rd valve V3, the 4th valve V4, the 7th Valve V7, heater 11, BOG gases caused by LNG storage tank 1 enter BOG desuperheats by the gaseous phase outlet A1 in LNG storage tank 1 Device 2, LNG liquid in LNG storage tank 1 enter BOG attemperators 2 by the liquid-phase outlet A2 in LNG storage tank 1, BOG gases and LNG liquid mixes in BOG attemperators 2, forms the BOG gases that temperature reduces, after being compressed by BOG compressors 3, so Afterwards BOG utilization is realized by the 7th pipeline C7, the 6th pipeline C6, the 5th pipeline C5 subsequently into outside ductwork 7.
LNG liquefy process units accidental conditions and LNG liquefaction process units stopping production operating mode under BOG recovery systems it Between switching concrete operations it is as follows：
BOG recovery systems under LNG liquefaction process units accidental conditions liquefy under process units stopping production operating mode to LNG BOG recovery systems when switching over, close the first valve V1, the 3rd valve V3, the 7th valve V7, the 8th valve V8 and the 9th Valve V9, with connection by metal hose public work nitrogen at showering guilding valve PV, by 8 word blind plates 10 by blind conducting, from showering guilding valve PV Place is passed through nitrogen and enters line replacement, and it is qualified that oxygen content is less than 1% displacement, recovers showering guilding valve PV blind plates, opens the 8th valve V8 and the Nine valve V9, a kind of LNG storage tank for the LNG liquefaction process units stopping production operating modes that remaining operation provides according to the invention described above The concrete operations of BOG recovery systems are carried out.
BOG recovery systems under LNG liquefaction process units stopping production operating modes liquefy under process units accidental conditions to LNG BOG recovery systems when switching over, close the 8th valve V8 and the 9th valve V9, connection by metal hose used at showering guilding valve 19 Public work nitrogen, 8 word blind plates 10 are blind by admittance, nitrogen is passed through at showering guilding valve PV and enters line replacement, oxygen content is put less than 1% It is qualified to change, and recovers showering guilding valve PV blind plates, reaffirms that the 8th valve V8 and the 9th valve V9 is closed, and remaining operation is according to above-mentioned A kind of concrete operations of the BOG recovery systems of the LNG storage tank for the LNG liquefaction process units accidental conditions that invention provides are entered OK.
Above-mentioned embodiment is merely to illustrate the present invention, wherein the structure of each part, connected mode and manufacture craft Deng can all be varied from, every equivalents carried out on the basis of technical solution of the present invention and improvement, should Exclude outside protection scope of the present invention.

Claims (4)

1. a kind of BOG recovery systems of LNG storage tank, including LNG storage tank (1), BOG attemperators (2), BOG compressors (3), raw material Air compressor (4), de- heavy hydrocarbon system (5), liquefaction system (6), outside ductwork (7) and unstripped gas source (8), the one of LNG storage tank (1) Bar gaseous phase outlet (A1) is connected with the entrance of BOG attemperators (2) by pipeline, a liquid-phase outlet (A2) of LNG storage tank (1) with The entrance of BOG attemperators (2) is connected by pipeline, and the outlet of BOG attemperators (2) passes through pipeline with the entrance of BOG compressors (3) Connection, the outlet of BOG compressors (3) are connected with the entrance of feed gas compressor (4) by the first pipeline (C1), the first pipeline (C1) the first valve (V1) is provided with, the outlet of unstripped gas source (8) and the entrance of feed gas compressor (4) are connected by pipeline Connect, the outlet of feed gas compressor (4) is connected with the 13rd pipeline (C13) of de- heavy hydrocarbon system (5) by pipeline, takes off heavy hydrocarbon system 12nd pipeline (C12) of system (5) is connected with the entrance of liquefaction system (6) by the second pipeline (C2), and liquefaction system (6) go out Mouth is connected with the entrance (A3) of LNG storage tank (1) by pipeline, and the second pipeline (C2) connects with regeneration gas source pipeline (C3), then Angry source pipeline (C3) is connected with the 8th pipeline (C8) of de- heavy hydrocarbon system (5) by pipeline, takes off the 4th of heavy hydrocarbon system (5) Pipeline (C4) is connected with the entrance of outside ductwork (7) by the 5th pipeline (C5), takes off the 4th pipeline (C4) and original of heavy hydrocarbon system (5) The entrance of material air compressor (4) is connected by the 6th pipeline (C6), and the 5th pipeline (C5) connects with the 6th pipeline (C6), its feature It is：The outlet of BOG compressors (3) is connected with the 6th pipeline (C6) by the 7th pipeline (C7), is set on the 7th pipeline (C7) There are the 8th valve (V8) and the 9th valve (V9).
2. the BOG recovery systems of LNG storage tank according to claim 1, it is characterised in that：Set on 7th pipeline (C7) There are 8 word blind plates (10), 8 word blind plates (10) are arranged between the 8th valve (V8) and the 9th valve (V9).
3. the BOG recovery systems of LNG storage tank according to claim 1 or 2, it is characterised in that：Set on 7th pipeline (C7) Showering guilding valve (PV) is equipped with, showering guilding valve (PV) is arranged between the 8th valve (V8) and the 9th valve (V9).
4. the BOG recovery systems of LNG storage tank according to claim 1 or 2, it is characterised in that：Set on 7th pipeline (C7) It is equipped with flowmeter (9).
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