CN106642985A - Quickly driving system used in floating liquid natural gas unit and driving method thereof - Google Patents
Quickly driving system used in floating liquid natural gas unit and driving method thereof Download PDFInfo
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- CN106642985A CN106642985A CN201611099551.3A CN201611099551A CN106642985A CN 106642985 A CN106642985 A CN 106642985A CN 201611099551 A CN201611099551 A CN 201611099551A CN 106642985 A CN106642985 A CN 106642985A
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- precooling
- heat exchanger
- lng
- cryogen
- deep cooling
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical group C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 114
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000003949 liquefied natural gas Substances 0.000 title abstract description 57
- 238000001816 cooling Methods 0.000 claims abstract description 100
- 239000003345 natural gas Substances 0.000 claims abstract description 56
- 239000007789 gas Substances 0.000 claims abstract description 46
- 238000002156 mixing Methods 0.000 claims abstract description 7
- 239000003507 refrigerant Substances 0.000 claims description 73
- 239000000872 buffer Substances 0.000 claims description 15
- 239000007788 liquid Substances 0.000 claims description 10
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 239000002994 raw material Substances 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 2
- 239000013589 supplement Substances 0.000 claims description 2
- 230000008676 import Effects 0.000 claims 1
- 210000000582 semen Anatomy 0.000 claims 1
- 239000000203 mixture Substances 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 4
- 239000012071 phase Substances 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 3
- 230000002411 adverse Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 235000019628 coolness Nutrition 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 230000033001 locomotion Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000009183 running Effects 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0203—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a single-component refrigerant [SCR] fluid in a closed vapor compression cycle
- F25J1/0208—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a single-component refrigerant [SCR] fluid in a closed vapor compression cycle in combination with an internal quasi-closed refrigeration loop, e.g. with deep flash recycle loop
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/0002—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the fluid to be liquefied
- F25J1/0022—Hydrocarbons, e.g. natural gas
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
- F25J1/0047—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using an "external" refrigerant stream in a closed vapor compression cycle
- F25J1/0052—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using an "external" refrigerant stream in a closed vapor compression cycle by vaporising a liquid refrigerant stream
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
- F25J1/0047—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using an "external" refrigerant stream in a closed vapor compression cycle
- F25J1/0052—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using an "external" refrigerant stream in a closed vapor compression cycle by vaporising a liquid refrigerant stream
- F25J1/0055—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using an "external" refrigerant stream in a closed vapor compression cycle by vaporising a liquid refrigerant stream originating from an incorporated cascade
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0211—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a multi-component refrigerant [MCR] fluid in a closed vapor compression cycle
- F25J1/0214—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a multi-component refrigerant [MCR] fluid in a closed vapor compression cycle as a dual level refrigeration cascade with at least one MCR cycle
- F25J1/0215—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a multi-component refrigerant [MCR] fluid in a closed vapor compression cycle as a dual level refrigeration cascade with at least one MCR cycle with one SCR cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
- F25J1/0244—Operation; Control and regulation; Instrumentation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
- F25J1/0244—Operation; Control and regulation; Instrumentation
- F25J1/0245—Different modes, i.e. 'runs', of operation; Process control
- F25J1/0247—Different modes, i.e. 'runs', of operation; Process control start-up of the process
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
- F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
- F25J1/0279—Compression of refrigerant or internal recycle fluid, e.g. kind of compressor, accumulator, suction drum etc.
- F25J1/0292—Refrigerant compression by cold or cryogenic suction of the refrigerant gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2210/00—Processes characterised by the type or other details of the feed stream
- F25J2210/04—Mixing or blending of fluids with the feed stream
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2210/00—Processes characterised by the type or other details of the feed stream
- F25J2210/62—Liquefied natural gas [LNG]; Natural gas liquids [NGL]; Liquefied petroleum gas [LPG]
Abstract
The invention discloses a quickly driving system used in a floating liquid natural gas unit and a driving method thereof. The driving system comprises an LNG quick mixing precooling system, a precooling cryogen circulatory system, a deep cooling cryogen circulatory system and a storage system, wherein the LNG quick mixing precooling system is used for mixing LNG and natural gas and making the mixture enter a precooling heat exchanger; the precooling cryogen circulatory system is used for precooling virgin gas and deep cooling cryogen, a precooling circulation input end is connected to an outlet of an outlet cooler of a precooling cryogen compressor, and precooling cryogen returns to an inlet of the precooling cryogen compressor after being subjected to heat exchanging through the precooling heat exchanger; the deep cooling cryogen circulatory system is used for providing cooling capacity needed by liquefaction of raw natural gas, the input end of the deep cooling cryogen circulatory system is connected to an outlet of an outlet cooler of a deep cooling cryogen compressor and enters an inlet of the deep cooling cryogen compressor again after passing the precooling heat exchanger and a deep cooling heat exchanger, the virgin gas passes through the LNG quick mixing precooling system, the precooling heat exchanger and the deep cooling heat exchanger from a virgin gas pipeline to an LNG output pipeline; the storage system is used for introducing cooled LNG into an LNG storage tank to be subjected to storage and making the natural gas which is not liquefied burn at the same time.
Description
Technical field
The present invention relates to LNG Technology field, more particularly to a kind of for the quick of floating natural gas liquefaction device
Driving system and its starting method.
Background technology
China's offshore natural gas resource very abundant but dispersion is distributed, major part is deep-sea gas field, marginal little gas field and low
Grade natural gas resource.Therefore, cost and technology are limited to, it is impossible to carry out using traditional ocean fixed platform or submarine pipeline
Exploitation.And floating natural gas liquefaction device (FLNG) with flexible configuration, is easy to move as new marginal gas field development technology
Move, it is reusable the advantages of and gain great popularity, this has great reality meaning to promoting China deep-sea gas field, little gas field development
Justice.
The driving step of conventional natural gas liquefying plant is：1. natural gas side ventilation；2. precooling refrigerant compressor is opened, is built
Vertical precooling refrigerant cycle；3. deep cooling refrigerant compressor is opened, and sets up deep cooling refrigerant cycle.4. build completely in each pressures cycle
After vertical, heat exchanger slow cooling, until obtaining liquefied natural gas (LNG) product.It is little that whole startup procedure takes about 10-12
When, the natural gas not liquefied all discharges torch.Therefore, the time-consuming many and unstripped gas of traditional driving mode wastes serious.
Different from land natural gas liquefaction plant, FLNG operations at sea are often subject to adverse weather conditions, wind, wave,
Stream etc. is under the collective effect of marine environment, the resonance between FLNG ship motions and the rocking of LNG in cabin under different loading situations
Response can cause the strenuous exercise of FLNG hulls, so as to cause the parking of liquefying plant；Further, since marine source of the gas it is unstable and
The exceedingly odious weather such as typhoon affects to will also result in device driving and parking related frequency.Therefore, reduce FLNG devices drive the time into
For FLNG plant runnings when one of problem demanding prompt solution.
The content of the invention
It is an object of the invention to provide a kind of quick FLNG devices driving system and its starting method, so as to effectively contract
The driving time of short floating natural gas liquefaction device.
It is that, up to above-mentioned purpose, the technical solution used in the present invention is：
A kind of rapid Start-Up system for floating natural gas liquefaction device, including：
Fast precooling system is cooled down to unstripped gas, mainly includes fast precooling pipeline and related valve, and it is quick pre-
Cold pipeline is connected with raw material gas pipeline, and LNG in storage tank is mixed with unstripped gas；
Precooling refrigerant cycle system, is that unstripped gas and deep cooling cryogen provide cold, mainly includes precool heat exchanger device, pre- cold
Agent suction port of compressor surge tank, precooling refrigerant compressor, precooling refrigerant compressor outlet cooler.Precooling cryogen is changed through precooling
Become gas phase after hot device heat release, sequentially enter precooling refrigerant compressor inlet buffer, precooling refrigerant compressor and precooling cryogen
Compressor outlet cooler, eventually becomes liquid phase and is back to precool heat exchanger device entrance, completes precooling refrigerant cycle；
Deep cooling refrigerant cycle system is used to provide the cold needed for raw natural gas liquefaction, mainly include precool heat exchanger device,
Deep-cooling heat exchanger, deep cooling cryogen knockout drum, deep cooling refrigerant compressor inlet buffer, deep cooling refrigerant compressor, deep cooling are cold
Agent compressor outlet cooler.Deep cooling cryogen is divided into gas-liquid two-phase after being cooled in precool heat exchanger device, respectively enters deep cooling and changes
Hot device, after the heat release that throttles respectively in deep-cooling heat exchanger gas phase is all become, sequentially enter deep cooling refrigerant compressor inlet buffer,
Deep cooling refrigerant compressor, deep cooling refrigerant compressor outlet cooler, are finally back to precool heat exchanger device entrance, complete deep cooling cryogen and follow
Ring；
Storage system, mainly includes LNG export pipelines, LNG storage tank, LNG rear pumps and flare discharge pipeline, after liquefaction
Natural gas is imported into LNG storage tank storage through LNG export pipelines, and the natural gas not liquefied enters torch through flare discharge pipeline
System.
According to rapid Start-Up system proposed by the present invention, wherein, the fast precooling system includes fast precooling pipeline, original
Material gas suction line, the fast precooling pipeline is connected from LNG rear pumps with unstripped gas suction line, and described quick pre-
Regulating valve is set on cold pipeline and flow is indicated.The regulating valve indicates to be adjusted manually according to the flow.
According to rapid Start-Up system proposed by the present invention, wherein, the precooling refrigerant cycle system include precool heat exchanger device,
Precooling refrigerant compressor inlet buffer, precooling refrigerant compressor, precooling refrigerant compressor outlet cooler.Precooling cryogen passes through
The entrance of the precool heat exchanger device exchanges heat into precooling switching heat-exchanger, and from the outlet of the precool heat exchanger device pre- colding pressing is passed sequentially through
Contracting machine inlet buffer, pre- cold compressor and precooling compressor outlet cooler, return via the entrance of the precool heat exchanger device
Precool heat exchanger device completes circulation.In precool heat exchanger device there is heat exchange in precooling cryogen, three kinds of media of deep cooling cryogen and natural gas,
Wherein, precooling cryogen provides cold for other media.
According to rapid Start-Up system proposed by the present invention, wherein, the deep cooling refrigerant cycle system is changed including precooling cryogen
Hot device, deep cooling cryogen knockout drum, deep-cooling heat exchanger, deep cooling refrigerant compressor inlet buffer, deep cooling refrigerant compressor, deep cooling are cold
Agent compressor outlet cooler.In deep-cooling heat exchanger, there is heat exchange in natural gas with deep cooling cryogen, and deep cooling cryogen provides cold
Amount, by natural gas liquefaction.Deep cooling cryogen is partly condensed after the precool heat exchanger device, and gas-liquid two-phase respectively enters deep cooling and changes
Hot device, throttles after pressure-reducing valve, and for natural gas liquefaction cold is provided.Natural gas is liquefied after deep-cooling heat exchanger, enters
The LNG stocking systems.
According to rapid Start-Up system proposed by the present invention, wherein, the storage system LNG storage tank, LNG export pipelines, LNG
Rear pump.The LNG export pipelines connect the deep-cooling heat exchanger and the LNG storage tank, and are provided with pressure transmitter, temperature
Transmitter, flow transmitter and control valve.The control valve is adjusted by the flow transmitter.The flare discharge pipe
Line is connected to the LNG export pipelines bypass, and by switch valve flare system is connected to.Unstripped gas after liquefaction is through described
LNG export pipelines enter the LNG storage tank.The unstripped gas that do not liquefy is discharged to flare system through the flare discharge pipeline.Storage tank
Interior LNG enters the fast precooling pipeline by the LNG rear pumps.
According to rapid Start-Up system proposed by the present invention, wherein, LNG enters through the LNG fast precoolings pipeline in storage tank
Enter the gas inlet pipeline according to mass flow according to 1：5～1：15 mixing.
According to rapid Start-Up system proposed by the present invention, wherein, by adjusting control valve aperture, rate of temperature fall control is existed
20～40 DEG C/h
According to rapid Start-Up system proposed by the present invention, wherein, precool heat exchanger device and deep-cooling heat exchanger are adopted and changed around tubular type
One or two in hot device or ice chest.
The present invention also provides a kind of rapid Start-Up method for floating natural gas liquefaction device, including：
S1：Emptied part precooling cryogen and deep cooling cryogen；
S2：Precooling refrigerant compressor and its related pressure-reducing valve are opened, precooling refrigerant cycle is set up；
S3：Deep cooling refrigerant compressor and its related pressure-reducing valve are opened, deep cooling refrigerant cycle is set up；
S4：Supplement going out for precooling cryogen and deep cooling cryogen, the precooling refrigerant compressor and the deep cooling refrigerant compressor
Mouth pressure is stepped up；
S5：Natural gas enters precool heat exchanger device and deep-cooling heat exchanger, keeps natural gas liquefaction pipeline unimpeded；Open natural gas
Export pipeline and flare discharge pipeline, make the natural gas discharge not liquefied to torch；
S6：Unlatching is arranged on the LNG rear pumps of LNG storage tank bottom, makes the LNG in LNG storage tank through fast precooling pipeline
Into gas inlet pipeline, according to a certain percentage (mass flow is according to 1 with natural gas：5～1：15) it is mixed into precool heat exchanger
Device；
S7：Gradually increase the flow of LNG, make the stable rate of temperature fall of gas outlet in 20～40 DEG C/h；
S8：When natural gas is all liquefied, flare discharge valve is closed；Gradually increase the flow of natural gas, observe temperature
The temperature of transmitter indicates that holding natural gas goes out liquid status；
S9：When going out liquid and being stable, the aperture of flow control valve is gradually reduced until closing.Gradually increase raw material gas control valve
Aperture；When the outlet pressure and inlet temperature of pre- cold compressor and deep freeze compressor have reached design load, natural gas flow
Amount is adjusted to design load, and driving precooling process terminates.Compared with prior art, present invention uses in LNG storage tank LNG cold
Replace the cold of part precooling and deep cooling cryogen, reduce the time set up required for refrigerant cycle, and then greatly shorten out
The car time, torch gas discharge during reducing driving, and greatly improve adaptability of the device to maritime environment.
Description of the drawings
Fig. 1 is the structural representation of the specific embodiment of rapid Start-Up system one of the present invention.
Description of reference numerals：1- switch valves；2- regulating valves；3- raw material gas pipelines；4- precool heat exchanger devices；5- deep coolings exchange heat
Device；6- pressure transmitters；7- temperature transmitters；8- flow transmitters；9- controls valve；10- flare discharge pipelines；11- switch valves；
12-LNG export pipelines；13-LNG rear pumps；14-LNG storage tanks；15- switch valves；16- flows are indicated；17- flow control valves；
18-LNG fast precooling pipelines；19- precooling refrigerant compressor inlet buffers；20- precooling refrigerant compressors；21- precooling cryogens
Compressor outlet cooler；22- deep cooling refrigerant compressor inlet buffers；23- deep cooling refrigerant compressors；24- deep cooling cryogen pressures
Contracting machine exports cooler；25- deep cooling cryogen knockout drums；26- pressure-reducing valves；27- pressure-reducing valves.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than the embodiment of whole.Based on this
Embodiment in invention, the every other reality that those of ordinary skill in the art are obtained under the premise of creative work is not paid
Example is applied, the scope of protection of the invention is belonged to.
Fig. 1 is referred to, is the structural representation of the specific embodiment of rapid Start-Up system one of the present invention.As shown in figure 1, this
The rapid Start-Up system of invention includes precool heat exchanger device 4, and the input of the precool heat exchanger device 4 is by switch valve 1 and regulating valve 2
Connection unstripped gas, the output end of the precool heat exchanger device 4 is sequentially connected precooling suction port of compressor surge tank 19, pre- cold compressor 20
With precooling compressor outlet cooler 21, the output end of the precooling compressor outlet cooler 21 is connected to the precool heat exchanger
The input of device 4.
The input of deep-cooling heat exchanger 5 connects the output of the precool heat exchanger device 4, the output end of the deep-cooling heat exchanger 5
It is sequentially connected deep freeze compressor inlet buffer 22, deep freeze compressor 23 and deep freeze compressor outlet cooler 24, the deep cooling
The output end of compressor outlet cooler 24 is connected to the input of the precool heat exchanger device 4.
Pressure transmitter 6 that the output end of the deep-cooling heat exchanger 5 is sequentially connected, temperature transmitter 7, flow transmitter 8,
Control valve 9, flare discharge pipeline 10 and LNG export pipelines 12, the flare discharge pipeline 10 is connected to by a switch valve 11
Torch；The LNG export pipelines 12 are connected to LNG storage tank 14.
The bottom of the LNG storage tank 14 is provided with LNG rear pumps 13, the output end of the LNG rear pumps 13 connects successively
Connect flow indicator 16, flow control valve 17 and LNG fast precoolings pipeline 18, the output end of the LNG fast precoolings pipeline 18
It is connected to the input of the precool heat exchanger device 4.
The idiographic flow of the starting method that the present invention is formed according to above-mentioned rapid Start-Up system is as follows：
S1：Emptied part precooling cryogen and deep cooling cryogen；
S2：Precooling refrigerant compressor 20 and related pressure-reducing valve are opened, precooling refrigerant cycle is set up；
S3：Deep cooling refrigerant compressor 23, pressure-reducing valve 26 and pressure-reducing valve 27 are opened, deep cooling refrigerant cycle is set up；
S4：Precooling cryogen and deep cooling cryogen are supplemented, two compressor outlet pressures are stepped up；
S5：After refrigerant cycle is set up, switch valve 1 is opened, the aperture of regulating valve 2 is low discharge, and natural gas is introduced precooling
Heat exchanger 4 and deep-cooling heat exchanger 5, and keep natural gas liquefaction pipeline unimpeded.Open liquefied natural gas export pipeline 12 and torch
Discharge pipe line 10, makes the natural gas discharge not liquefied to torch；
S6：LNG rear pumps 13 are opened, valve 15 is closed, control valve 17 is opened, the LNG in storage tank is made through fast precooling
Pipeline 18 enters gas inlet pipeline with natural gas according to mass flow 1：10 ratio is mixed into precool heat exchanger device.Pass through
Control valve 2 and control valve 17 adjust the mixed proportion of unstripped gas and LNG, control the cooldown rate of gas outlet；
S7：As two refrigerant compressor outlet pressures are stepped up, refrigeration is stepped up, precool heat exchanger device and depth
Cold heat exchanger temperature is gradually lowered.To accelerate cooling velocity, it is stepped up controlling the aperture of valve 17, increases the flow of LNG, maintains
Stable rate of temperature fall is less than 30 DEG C/h, and the cold and hot logistics temperature difference of precool heat exchanger device and deep-cooling heat exchanger is less than 50 DEG C；
S8：When the temperature of temperature transmitter 7 reaches setting value (natural gas is cooled to LNG), flare discharge valve 11 is closed.
It is gradually reduced the aperture of control valve 17 and increases the aperture of control valve 2, increase the flow of natural gas, observes temperature transmitter 7
Temperature indicates that holding natural gas goes out liquid status；
S9：When going out liquid and being stable, the aperture of control valve 17 is gradually reduced, until closing.Gradually increase opening for control valve 2
Degree.When refrigerant compressor outlet pressure and inlet temperature have reached design load, gas discharge is adjusted to design load.Drive
Precooling process terminates.
One of ordinary skill in the art will appreciate that：Accompanying drawing is the schematic diagram of one embodiment, and the precooling in accompanying drawing is changed
, using the one kind in ice chest or wound tube heat exchanger, the module or flow process in accompanying drawing is not necessarily for hot device and deep-cooling heat exchanger
Implement the present invention necessary.
One of ordinary skill in the art will appreciate that：The module in device in embodiment can be according to embodiment description point
In being distributed in the device of embodiment, it is also possible to carry out respective change and be disposed other than in one or more devices of the present embodiment.On
Stating the module of embodiment can merge into a module, it is also possible to be further split into multiple submodule.
Finally it should be noted that：Above example only to illustrate technical scheme, rather than a limitation；Although
The present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those within the art that：It still may be used
To modify to the technical scheme described in previous embodiment, or equivalent is carried out to which part technical characteristic；And
These modifications are replaced, and do not make the spirit and model of the essence disengaging embodiment of the present invention technical scheme of appropriate technical solution
Enclose.
Claims (9)
1. a kind of rapid Start-Up system for floating natural gas liquefaction device, it is characterised in that including LNG fast precoolings system
System, precooling refrigerant cycle system, deep cooling refrigerant cycle system and stocking system；
Fast precooling system is used for cooling down unstripped gas, including fast precooling pipeline and related valve, its fast precooling pipe
Line is connected with raw material gas pipeline, and LNG in storage tank is mixed with unstripped gas；
Precooling refrigerant cycle system, there is provided unstripped gas and deep cooling cryogen carry out the cold required for precooling, including precool heat exchanger device,
Precooling refrigerant compressor, precooling refrigerant compressor inlet buffer, precooling refrigerant compressor outlet cooler；Precooling cryogen is passed through
Become gas phase after precool heat exchanger device heat release, sequentially enter precooling refrigerant compressor inlet buffer, precooling refrigerant compressor, precooling
Refrigerant compressor exports cooler, finally returns to precool heat exchanger device entrance, completes precooling refrigerant cycle；
Deep cooling refrigerant cycle system, the cold needed for for providing raw natural gas liquefaction, including deep-cooling heat exchanger, deep cooling cryogen
Knockout drum, deep cooling refrigerant compressor inlet buffer, deep cooling refrigerant compressor, deep cooling refrigerant compressor outlet cooler；
Deep cooling cryogen is divided into gas-liquid two-phase after being cooled in precool heat exchanger device, and the heat release that throttles respectively in deep-cooling heat exchanger all becomes gas
Phase, sequentially enters deep cooling refrigerant compressor inlet buffer, deep cooling refrigerant compressor, deep cooling refrigerant compressor and exports cold after mixing
But device, finally returns to precool heat exchanger device entrance, completes deep cooling refrigerant cycle；
Storage system, including LNG export pipelines, LNG storage tank, LNG rear pumps and flare discharge pipeline, the natural gas Jing after liquefaction
Cross LNG export pipelines to import into LNG storage tank storage, the natural gas not liquefied enters flare system through flare discharge pipeline.
2. rapid Start-Up system according to claim 1, it is characterised in that the fast precooling system includes fast precooling
Pipeline, unstripped gas suction line, the fast precooling pipeline is connected from LNG rear pumps with unstripped gas suction line, and described
Regulating valve is set on fast precooling pipeline and flow is indicated；The regulating valve indicates to be adjusted manually according to the flow.
3. rapid Start-Up system according to claim 1, it is characterised in that the precooling refrigerant cycle system includes precooling
Heat exchanger, precooling refrigerant compressor inlet buffer, precooling refrigerant compressor, precooling refrigerant compressor outlet cooler；Precooling
Cryogen is exchanged heat by the entrance of the precool heat exchanger device into precooling switching heat-exchanger, is led to successively from the outlet of the precool heat exchanger device
Precooling suction port of compressor surge tank, pre- cold compressor and precooling compressor outlet cooler are crossed, via the precool heat exchanger device
Entrance returns precool heat exchanger device and completes circulation.Precooling cryogen, three kinds of media of deep cooling cryogen and natural gas are sent out in precool heat exchanger device
Heat is exchanged, wherein, precooling cryogen provides cold for other media.
4. rapid Start-Up system according to claim 1, it is characterised in that the deep cooling refrigerant cycle system includes precooling
Cryogen heat exchanger, deep cooling cryogen knockout drum, deep-cooling heat exchanger, deep cooling refrigerant compressor inlet buffer, deep cooling refrigerant compressor,
Deep cooling refrigerant compressor exports cooler；In deep-cooling heat exchanger, there is heat exchange in natural gas with deep cooling cryogen, and deep cooling cryogen is carried
Semen donors, by natural gas liquefaction.Deep cooling cryogen is partly condensed after the precool heat exchanger device, and gas-liquid two-phase respectively enters depth
Cold heat exchanger, throttles after pressure-reducing valve, and for natural gas liquefaction cold is provided.Natural gas is liquefied after deep-cooling heat exchanger,
Into the LNG stocking systems.
5. rapid Start-Up system according to claim 1, it is characterised in that the storage system LNG storage tank, LNG outputs
Pipeline, LNG rear pumps.The LNG export pipelines connect the deep-cooling heat exchanger and the LNG storage tank, and are provided with pressure change
Send device, temperature transmitter, flow transmitter and control valve；The control valve is adjusted by the flow transmitter；It is described
Flare discharge pipeline is connected to the LNG export pipelines bypass, and by switch valve flare system is connected to；Unstripped gas after liquefaction
The LNG storage tank is entered through the LNG export pipelines；The unstripped gas that do not liquefy is discharged to torch system through the flare discharge pipeline
System；LNG enters the fast precooling pipeline by the LNG rear pumps in storage tank.
6. rapid Start-Up system according to claim 2, it is characterised in that LNG is through the LNG fast precoolings in storage tank
Pipeline enters the gas inlet pipeline according to mass flow according to 1：5～1：15 mixing.
7. rapid Start-Up system according to claim 5, it is characterised in that by adjusting control valve aperture, by cooling speed
Rate is controlled in 20～40 DEG C/h.
8. rapid Start-Up system according to claim 1, it is characterised in that precool heat exchanger device and deep-cooling heat exchanger adopt around
One kind in pipe heat exchanger or ice chest.
9. a kind of rapid Start-Up method for floating natural gas liquefaction device, it is characterised in that include：
S1：Emptied part precooling cryogen and deep cooling cryogen；
S2：Precooling refrigerant compressor and its related pressure-reducing valve are opened, precooling refrigerant cycle is set up；
S3：Deep cooling refrigerant compressor and its related pressure-reducing valve are opened, deep cooling refrigerant cycle is set up；
S4：Supplement the outlet pressure of precooling cryogen and deep cooling cryogen, the precooling refrigerant compressor and the deep cooling refrigerant compressor
Power is stepped up；
S5：Natural gas enters precool heat exchanger device and deep-cooling heat exchanger, keeps natural gas liquefaction pipeline unimpeded；Open natural gas output
Pipeline and flare discharge pipeline, make the natural gas discharge not liquefied to torch；
S6：Unlatching is arranged on the LNG rear pumps of LNG storage tank bottom, the LNG in LNG storage tank is entered through fast precooling pipeline
According to a certain percentage (mass flow is according to 1 with natural gas for gas inlet pipeline：5～1：15) it is mixed into precool heat exchanger device；
S7：Gradually increase the flow of LNG, maintain the stable rate of temperature fall of gas outlet in 20～40 DEG C/h；
S8：When the temperature of temperature transmitter reaches setting value, flare discharge valve is closed；Gradually increase the flow of natural gas, see
The temperature for examining temperature transmitter indicates that holding natural gas goes out liquid status；
S9：When going out liquid and being stable, the aperture of flow control valve is gradually reduced until closing.Gradually increase opening for raw material gas control valve
Degree；When the outlet pressure and inlet temperature of pre- cold compressor and deep freeze compressor have reached design load, gas discharge is adjusted
Design load is saved, driving precooling process terminates.
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| CN106642985B (en) | 2019-07-02 |
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Effective date of registration: 20201215 Address after: 100120 Xicheng District six paw Kang in Beijing City Patentee after: CHINA NATIONAL PETROLEUM Corp. Patentee after: CHINA HUANQIU CONTRACTING & ENGINEERING Co.,Ltd. Address before: No.1, Chuangda 2nd Road, Laiguangying hi tech Industrial Park, Chaoyang District, Beijing, 100012 Patentee before: CHINA HUANQIU CONTRACTING & ENGINEERING Co.,Ltd. |