CN106917957A - A kind of BOG recovery systems of LNG storage tank - Google Patents
A kind of BOG recovery systems of LNG storage tank Download PDFInfo
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- CN106917957A CN106917957A CN201610566462.9A CN201610566462A CN106917957A CN 106917957 A CN106917957 A CN 106917957A CN 201610566462 A CN201610566462 A CN 201610566462A CN 106917957 A CN106917957 A CN 106917957A
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- Prior art keywords
- pipeline
- valve
- bog
- heavy hydrocarbon
- storage tank
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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 is connected with the entrance of feed gas compressor by pipeline, 4th pipeline of de- heavy hydrocarbon system is connected with the entrance of outside ductwork by the 5th pipeline, 4th pipeline of de- heavy hydrocarbon system is connected with the entrance of feed gas compressor 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 realizes the outer defeated utilization of BOG gases using the existing pipeline of factory, can reduce Enterprise Construction cost, improves the utilization rate of resource, reduces the pollution to environment, reduces potential safety hazard.
Description
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 storages
The BOG recovery systems of tank.
Background technology
Liquefied natural gas LNG has the advantages such as cleanliness without any pollution, and extensive utilization has been obtained 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 again be changed into LNG, return to LNG storage tank, realize the recycling of BOG gases.But when LNG liquefaction
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 cannot be utilized, and once after the carrying capacity of LNG storage tank, can only largely be emitted into the burning of torch high point, be caused pure
The waste of net BOG gas resources, influences the production efficiency of factory, and the income of company is reduced 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
Waste, pollution environment and the safety of BOG gas resources during in order to overcome 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 by pipeline with the entrance of BOG compressors, the outlet of BOG compressors and the entrance of feed gas compressor are by the
One pipeline is connected, and the first valve is provided with the first pipeline, and the outlet in unstripped gas source passes through with the entrance of feed gas compressor
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
12nd pipeline is connected with the entrance of liquefaction system by the second pipeline, and the outlet of liquefaction system passes through with the entrance of LNG storage tank
Pipeline is connected, and the second pipeline leads to regeneration gas source pipeline connection, regeneration gas source pipeline with the 8th pipeline of de- heavy hydrocarbon system
Pipeline connection is crossed, the 4th pipeline of de- heavy hydrocarbon system is connected with the entrance of outside ductwork by the 5th pipeline, the of de- heavy hydrocarbon system
Four pipelines are connected with the entrance of feed gas compressor 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 for taking off heavy hydrocarbon system is in idle state.The present invention provides a kind of BOG of LNG storage tank and reclaims
System, during LNG liquefaction process units stops production, BOG gases is conveyed by taking off the pipeline of heavy hydrocarbon system to outside ductwork, is utilized
Already present pipeline in LNG liquefaction process units, improves the utilization rate of pipeline, saves construction cost；By the input of BOG gases
It is that outside ductwork system supplements substantial amounts of source of the gas to outside ductwork, improves the utilization rate of BOG gas resources, to a certain extent
The production efficiency of company and the income of company are improve, the pollution level to environment is reduced, while reducing potential safety hazard.
8 word blind plates are provided with 7th pipeline, 8 word blind plates are in blind shape when LNG liquefaction process units normally runs
State, can be completely isolated with de- heavy hydrocarbon system by BOG compressors；When LNG liquefaction process units stops production, 8 word blind plates are in logical
State, realize sixth pipeline connection of the BOG compressors by 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,
Requirement of the oxygen content in 7th pipeline less than 1% can be realized by the use of showering guilding valve.
Flowmeter is provided with 7th pipeline, the specific tolerance for recording the conveying of BOG gases is realized to conveying tolerance
Monitor 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 that the present invention is provided；
Fig. 2 is the schematic diagram of de- heavy hydrocarbon system in the present invention；
Wherein,
1-LNG storage tank 2-BOG attemperator 3-BOG compressor 4- feed gas compressors
The de- heavy hydrocarbon system 6- liquefaction system 7- outside ductwork 8- unstripped gas sources of 5-
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
Specific 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 compressors (3), feed gas compressor (4), de- heavy hydrocarbon system (5), liquefaction system (6), outside ductwork (7) and unstripped gas
Source (8) a, gaseous phase outlet (A1) of LNG storage tank (1) is connected with the entrance of BOG attemperators (2) by pipeline, LNG storage tank
(1) a liquid-phase outlet (A2) is connected with the entrance of BOG attemperators (2) by pipeline, the outlet of BOG attemperators (2) and BOG
The entrance of compressor (3) is connected by pipeline, and the outlet of BOG compressors (3) passes through first with the entrance of feed gas compressor (4)
Pipeline (C1) is connected, and the first valve (V1) is provided with the first pipeline (C1), and outlet and the unstripped gas of unstripped gas source (8) compress
The entrance of machine (4) is connected by pipeline, the 13rd pipeline (C13) of the outlet of feed gas compressor (4) and de- heavy hydrocarbon system (5)
Connected by pipeline, the entrance of the 12nd pipeline (C12) and liquefaction system (6) that take off heavy hydrocarbon system (5) passes through the second pipeline
(C2) connect, the outlet of liquefaction system (6) is connected with the entrance (A3) of LNG storage tank (1) by pipeline, the second pipeline (C2) and again
Anger source pipeline (C3) connection, regeneration gas source pipeline (C3) passes through pipeline with the 8th pipeline (C8) of de- heavy hydrocarbon system (5)
Connection, 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 heavy hydrocarbon
4th pipeline (C4) of system (5) is connected with the entrance of feed gas compressor (4) by the 6th pipeline (C6), the 5th pipeline (C5)
Connected with the 6th pipeline (C6), the outlet of BOG compressors (3) is connected with the 6th pipeline (C6) by the 7th pipeline (C7), the 7th
The 8th valve (V8) and the 9th valve (V9) are provided with pipeline (C7).
8 word blind plates (10) are provided with 7th pipeline (C7), 8 word blind plates (10) are arranged on the 8th valve (V8) and the 9th valve
Between door (V9).
Showering guilding valve (PV) is provided with 7th pipeline (C7), showering guilding valve (PV) is arranged on the 8th valve (V8) and the 9th valve
(V9) between.
Flowmeter (9) is provided with 7th pipeline (C7).
The downstream of the first valve (V1) is provided with first check-valve (SV1), and the downstream of the second valve (V2) is provided with second
Check-valves (SV2), the downstream of the 3rd valve (V3) is provided with check-valves (SV3).
De- heavy hydrocarbon system (5) including heater (11), the first de- heavy hydrocarbon tower group (T1) and second take off heavy hydrocarbon tower group (T2) with
And corresponding pipeline and valve, first takes off heavy hydrocarbon tower group (T1) and second de- heavy hydrocarbon tower group (T2) arranged in parallel, each de- heavy hydrocarbon
The quantity of the de- heavy hydrocarbon tower in group is more than or equal to 1.Regeneration gas originates pipeline (C3) by being divided into the after the 4th valve (V4)
Nine pipelines (C9) and the parallel branch of the tenth pipeline (C10) two, set gradually the tenth valve (V10) and heating on the 9th pipeline (C9)
Device (11), is provided with the 11st valve (V11) on the tenth pipeline (C10), subsequent 9th pipeline (C9) and the tenth pipeline (C10)
Parallel pipeline is connected with the 11st pipeline (C11), and subsequent 11st pipeline (C11) is divided into two parallel branches, in tie point
The 12nd valve (V12), the first de- heavy hydrocarbon tower group (T1), the 14th valve (V14) are disposed with, are set successively on the second branch road
The 13rd valve (V13), the second de- heavy hydrocarbon tower group (T2), the 15th valve (V15) are equipped with, subsequent two parallel branch collects to be turned into
4th pipeline (C4), is provided with the 7th valve (V7) on the 4th pipeline (C4), subsequent 4th pipeline (C4) is divided into the 5th pipe again
Road (C5) and the 6th two branch roads of pipeline (C6), the 5th pipeline (C5) by the 5th valve (V5) and outside ductwork (7) entrance phase
Even, 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 parallel branches, are disposed with the 18th valve (V18), the first de- heavy hydrocarbon tower group (T1), the 16th valve in tie point
(V16) the 19th valve (V19), the second de- heavy hydrocarbon tower group (T2), the 17th valve (V17), are disposed with the second branch road,
Two branch roads collect as the 12nd pipeline (C12), and the 12nd pipeline (C12) is connected with the second pipeline (C2).
A kind of BOG recovery systems of LNG storage tank that the present invention is provided are under LNG liquefaction process units accidental conditions
Concrete operations are as follows：
Now feed gas compressor (4) normally runs, and takes off heavy hydrocarbon system (5) and normally runs, and opens the first valve (V1), the
Two valves (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) and heater (11), close the 8th valve (V8), the 9th valve (V9), remaining valve state
The concrete operations of absorption, regeneration and cooling on the first de- heavy hydrocarbon tower group (T1) and the second de- heavy hydrocarbon tower group (T2) in seeing below
In.
The BOG gases that LNG storage tank (1) is produced enter BOG attemperators by the gaseous phase outlet (A1) in LNG storage tank (1)
(2), the LNG liquid in LNG storage tank (1) enters BOG attemperators (2), BOG by the liquid-phase outlet (A2) in LNG storage tank (1)
The mixing in BOG attemperators (2) of gas and LNG liquid, forms the BOG gases of temperature reduction, is carried out by BOG compressors (3)
After compression, with originated from unstripped gas (8) unstripped gas together be compressed into feed gas compressor (4), then pass through
Enter de- heavy hydrocarbon system (5) after after decarburization, dewater treatment, enter into liquefaction system (6) after then being processed by demercuration
Row liquefaction, becomes to return to LNG storage tank (1) after LNG, realizes the recycling of BOG gases.
Now take off heavy hydrocarbon system (5) normally to run, the first de- heavy hydrocarbon tower group (T1) and the second de- heavy hydrocarbon tower group (T2) are alternately
Adsorbed and re-generatively cooled, absorption and the re-generatively cooled of another de- heavy hydrocarbon tower group of a 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 is cooled down, and first takes off
Regenerated and cooled down while carrying out, concrete operations are as follows with the second de- heavy hydrocarbon tower group (T2) during the absorption of heavy hydrocarbon tower group (T1)：
The absorption of the first de- heavy hydrocarbon tower group (T1)：Open the 13rd valve (V13), the 15th valve (V15), the 16th valve
Door (V16), the 18th valve (V18), close the 12nd valve (V12), the 14th valve (V14), the 17th valve (V17),
19th valve (V19), now 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 (T2) regeneration and cooling concrete operations.Gas from feed gas compressor (4)
After body is by decarburization, dewater treatment, into the 13rd pipeline (C13), then in turn through by the 18th valve (V18),
One de- heavy hydrocarbon tower group (T1), the 16th valve (V16), into the 12nd pipeline (C12), enter after being processed by demercuration and remove liquid
Second pipeline (C2) of change system (6), completes the absorption of the first de- heavy hydrocarbon tower group (T1).
The regeneration of the second de- heavy hydrocarbon tower group (T2)：The tenth valve (V10), the 5th valve (V5) are opened, the 11st valve is closed
Door (V11), the 6th valve (V6), now the 13rd valve (V13), the 15th valve (V15), the 16th valve (V16), the tenth
Eight valves (V18) are in open mode, the 12nd valve (V12), the 14th valve (V14), the 17th valve (V17), the tenth
Nine valves (V19) are closed, from regeneration gas source pipeline (C3) cold renewal gas sequentially pass through the 4th valve (V4),
8th pipeline (C8), the tenth valve (V10), by heater (11) heating after, become hot recycling gas, sequentially pass through the 11st pipe
Road (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 regeneration of the second de- heavy hydrocarbon tower group (T2).
The cooling of the second de- heavy hydrocarbon tower group (T2)：Second de- heavy hydrocarbon tower group (T2) regenerate it is qualified after, close the tenth valve
(V10), the 5th valve (V5), opens the 11st valve (V11), the 6th valve (V6), now the 13rd valve (V13), the tenth
Five valves (V15), the 16th valve (V16), the 18th valve (V18) are in open mode, the 12nd valve (V12), the tenth
Four valves (V14), the 17th valve (V17), the 19th valve (V19) are closed, from regeneration gas source pipeline
(C3) cold renewal gas is by the 4th valve (V4), the 8th pipeline (C8), the tenth pipeline (C10), the 11st pipeline (C11),
13 valves (V13), the second de- heavy hydrocarbon tower group (T2), the 15th valve (V15), the 4th pipeline (C4), then by the 6th pipe
Road (C6) returns to feed gas compressor (6) entrance, completes the cooling of the second de- heavy hydrocarbon tower group (T2).
When second de- heavy hydrocarbon tower group (T2) is adsorbed, the first de- heavy hydrocarbon tower group (T1) is regenerated and is cooled down, and second takes off
Regenerated and cooled down while carrying out, concrete operations are as follows with the first de- heavy hydrocarbon tower group (T1) during the absorption of heavy hydrocarbon tower group (T2)：
The absorption of the second de- heavy hydrocarbon tower group (T2)：Close the 13rd valve (V13), the 15th valve (V15), the 16th valve
Door (V16), the 18th valve (V18), open the 12nd valve (V12), the 14th valve (V14), the 17th valve (V17),
19th valve (V19), now 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 (T1) regeneration and cooling concrete operations.Gas from feed gas compressor (4)
After body is by decarburization, dewater treatment, into the 13rd pipeline (C13), then in turn through by the 19th valve (V19),
Two de- heavy hydrocarbon tower group (T2), the 17th valves (V17), into the 12nd pipeline (C12), enter after being processed by demercuration and remove liquid
Second pipeline (C2) of change system (6), completes the absorption of the second de- heavy hydrocarbon tower group (T2).
The regeneration of the first de- heavy hydrocarbon tower group (T1)：The tenth valve (V10), the 5th valve (V5) are opened, the 11st valve is closed
Door (V11), the 6th valve (V6), now the 13rd valve (V13), the 15th valve (V15), the 16th valve (V16), the tenth
Eight valves (V18) are closed, the 12nd valve (V12), the 14th valve (V14), the 17th valve (V17), the tenth
Nine valves (V19) be in open mode, from regeneration gas source pipeline (C3) cold renewal gas sequentially pass through the 4th valve (V4),
8th pipeline (C8), the tenth valve (V10), by heater (11) heating after, become hot recycling gas, sequentially pass through the 11st pipe
Road (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 regeneration of the first de- heavy hydrocarbon tower group (T1).
The cooling of the first de- heavy hydrocarbon tower group (T1)：De- heavy hydrocarbon tower group (T1) regenerate it is qualified after, close the tenth valve (V10),
5th valve (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 19th valve (V19) are in open mode, from the cold of regeneration gas source pipeline (C3)
Regeneration gas 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 4th pipeline (C4), then returns by the 6th pipeline (C6)
Feed gas compressor (6) entrance is returned, the cooling of the first de- heavy hydrocarbon tower group (T1) is completed.
A kind of BOG recovery systems of LNG storage tank that the present invention is provided are specific under LNG liquefaction process units stopping production operating modes
Operation is as follows：
Now feed gas compressor (4) cannot run, and it is out of service to take off heavy hydrocarbon system (5), opens the 5th valve (V5), the
Six valves (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), the BOG gases that LNG storage tank (1) is produced pass through LNG storage tank
(1) gaseous phase outlet (A1) on enters BOG attemperators (2), and the LNG liquid in LNG storage tank (1) is by LNG storage tank (1)
One liquid-phase outlet (A2) enters BOG attemperators (2), and the mixing in BOG attemperators (2) of BOG gases and LNG liquid forms temperature
The BOG gases of reduction, after being compressed by BOG compressors (3), then by the 7th pipeline (C7), the 6th pipeline (C6),
5th pipeline (C5) realizes the utilization of BOG 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 are under LNG liquefaction process units stopping production operating modes
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), from from showering guilding valve (PV) with connection by metal hose public work nitrogen, by 8 word blind plates (10) by blind
Conducting, nitrogen is passed through from from showering guilding valve (PV) and enters line replacement, and oxygen content is qualified less than 1% displacement, recovers showering guilding valve (PV) blind plate,
The 8th valve (V8) and the 9th valve (V9) are opened, remaining operation stops according to the LNG liquefaction process units that the invention described above is provided
The concrete operations for producing a kind of BOG recovery systems of LNG storage tank of operating mode are carried out.
BOG recovery systems under LNG liquefaction process units stopping production operating modes are under LNG liquefaction process units accidental conditions
BOG recovery systems when switching over, close the 8th valve (V8) and the 9th valve (V9), it is soft with metal from from showering guilding valve (19)
Pipe connects public work nitrogen, and 8 word blind plates (10) are blind by admittance, and being passed through nitrogen from from showering guilding valve (PV) enters line replacement, and oxygen contains
Amount is qualified less than 1% displacement, recovers showering guilding valve (PV) blind plate, reaffirms that the 8th valve (V8) and the 9th valve (V9) are closed,
A kind of BOG of LNG storage tank of the LNG liquefaction process units accidental conditions that remaining operation is provided according to the invention described above is reclaimed
The concrete operations of system are carried out.
Above-mentioned specific embodiment is merely to illustrate the present invention, wherein the structure of each part, connected mode and manufacture craft
Deng all can be what is 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. the BOG recovery systems of a kind 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) is 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) is connected with the entrance of feed gas compressor (4) 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, take off heavy hydrocarbon system
The 12nd pipeline (C12) of (5) of uniting 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) is connected with regeneration gas source pipeline (C3), then
Anger 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) is connected 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. 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. BOG recovery systems of LNG storage tank according to claim 1 and 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. BOG recovery systems of LNG storage tank according to claim 1 and 2, it is characterised in that：Set on 7th pipeline (C7)
It is equipped with flowmeter (9).
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| CN109404079A (en) * | 2018-11-27 | 2019-03-01 | 大连理工大学 | A kind of BOG for LNG receiving station is condensed and LNG cold energy generation integrated system again |
| CN111853536A (en) * | 2020-07-28 | 2020-10-30 | 上海交通大学 | Adsorption type self-pressurization and flash gas recovery integrated device for liquefied natural gas storage tank |
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|---|---|
| CN106917957B (en) | 2018-01-30 |
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