CN106642985B - A kind of rapid Start-Up system and its starting method for floating natural gas liquefaction device - Google Patents
A kind of rapid Start-Up system and its starting method for floating natural gas liquefaction device Download PDFInfo
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- CN106642985B CN106642985B CN201611099551.3A CN201611099551A CN106642985B CN 106642985 B CN106642985 B CN 106642985B CN 201611099551 A CN201611099551 A CN 201611099551A CN 106642985 B CN106642985 B CN 106642985B
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 104
- 239000003345 natural gas Substances 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000001816 cooling Methods 0.000 claims abstract description 166
- 239000003507 refrigerant Substances 0.000 claims abstract description 79
- 239000007789 gas Substances 0.000 claims abstract description 45
- 238000003860 storage Methods 0.000 claims abstract description 33
- 239000002994 raw material Substances 0.000 claims abstract description 6
- 239000003949 liquefied natural gas Substances 0.000 claims description 80
- 239000007788 liquid Substances 0.000 claims description 10
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 239000013589 supplement Substances 0.000 claims description 3
- 210000004209 hair Anatomy 0.000 claims 1
- 230000008676 import Effects 0.000 claims 1
- 238000002485 combustion reaction Methods 0.000 abstract 1
- 239000012071 phase Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000007791 liquid phase Substances 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
- 238000005057 refrigeration Methods 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 239000002699 waste material Substances 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
- F25J1/0002—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
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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]
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
- Separation By Low-Temperature Treatments (AREA)
Abstract
The present invention discloses a kind of rapid Start-Up system and its starting method for floating natural gas liquefaction device, and the driving system includes: that LNG quickly mixes chilldown system, for mixing LNG with natural gas, enters back into the precool heat exchanger device；Refrigerant cycle system is pre-chilled, for the pre-cooling of unstripped gas and deep cooling cryogen, the outlet of pre-cooling cycle input terminal connection pre-cooling refrigerant compressor outlet cooler, pre-cooling cryogen returns to the entrance of pre-cooling refrigerant compressor after the heat exchange of precool heat exchanger device；Deep cooling refrigerant cycle system is used to provide raw natural gas liquefaction required cooling capacity, the outlet of input terminal connection deep cooling refrigerant compressor outlet cooler, after pre-cooled heat exchanger, deep-cooling heat exchanger, is again introduced into deep cooling refrigerant compressor entrance.Unstripped gas quickly mixes chilldown system, precool heat exchanger device, deep-cooling heat exchanger to LNG export pipeline by LNG from raw material air pipe；Storage system for storing LNG after cooling importing LNG storage tank, while making not liquefied combustion of natural gas.
Description
Technical field
It is the present invention relates to LNG Technology field, in particular to a kind of for the quick of floating natural gas liquefaction device
Driving system and its starting method.
Background technique
China's offshore natural gas resource very abundant but distribution dispersion, most of is deep-sea gas field, the small gas field in limit and low
Grade natural gas resource.Therefore, it is limited to cost and technology, can not be carried out using traditional ocean fixed platform or submarine pipeline
Exploitation.And floating natural gas liquefaction device (FLNG) is used as novel marginal gas field development technology, have configuration flexibly, convenient for moving
Move, it is reusable the advantages that and gain great popularity, this to promote China, gas field, deep-sea, small gas field development have it is great reality anticipate
Justice.
The driving step of conventional natural gas liquefying plant are as follows: 1. natural gas side ventilations；2. opening pre-cooling refrigerant compressor, build
Vertical pre-cooling refrigerant cycle；3. opening deep cooling refrigerant compressor, and establish deep cooling refrigerant cycle.4. being built completely in each pressures cycle
After vertical, heat exchanger slow cooling, until obtaining liquefied natural gas (LNG) product.Entire startup procedure time-consuming is about 10-12 small
When, not liquefied natural gas all discharges torch.Therefore, the time-consuming more and unstripped gas waste of traditional driving mode is serious.
Different from land natural gas liquefaction plant, FLNG operation at sea is often subject to adverse weather conditions, wind, wave,
Stream etc. is under the collective effect of marine environment, the resonance between FLNG ship motion and the rocking of LNG in cabin under different loading situations
Response can cause the strenuous exercise of FLNG hull, so as to cause the parking of liquefying plant；In addition, since marine gas source is unstable and
The exceedingly odious weather influence such as typhoon will also result in device driving and parking related frequency.Therefore, reduce FLNG device drive the time at
One of urgent problem to be solved when being run for FLNG device.
Summary of the invention
It is an object of the invention to provide a kind of quick FLNG device driving system and its starting methods, to effectively contract
The driving time of short floating natural gas liquefaction device.
In order to achieve the above object, the technical solution adopted by the present invention are as follows:
A kind of rapid Start-Up system for floating natural gas liquefaction device, comprising:
Fast precooling system cools down unstripped gas, quickly pre- mainly including fast precooling pipeline and related valve
Cold pipeline is connected with raw material gas pipeline, and LNG in storage tank is mixed with unstripped gas；
Refrigerant cycle system is pre-chilled, provides cooling capacity for unstripped gas and deep cooling cryogen, it is mainly cold including precool heat exchanger device, pre-cooling
Agent suction port of compressor surge tank, pre-cooling refrigerant compressor, pre-cooling refrigerant compressor export cooler.Pre-cooling cryogen is changed by pre-cooling
Become gas phase after hot device heat release, sequentially enters pre-cooling refrigerant compressor inlet buffer, pre-cooling refrigerant compressor and pre-cooling cryogen
Compressor outlet cooler eventually becomes liquid phase and is back to precool heat exchanger device entrance, completes pre-cooling refrigerant cycle；
Deep cooling refrigerant cycle system be used for provide raw natural gas liquefaction needed for cooling capacity, 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 all becomes gas phase after the heat release that throttles respectively in deep-cooling heat exchanger, sequentially enter deep cooling refrigerant compressor inlet buffer,
Deep cooling refrigerant compressor, deep cooling refrigerant compressor export cooler, are finally back to precool heat exchanger device entrance, complete deep cooling cryogen and follow
Ring；
Storage system includes mainly LNG export pipeline, LNG storage tank, LNG rear pump and flare discharge pipeline, after liquefaction
Natural gas is imported into LNG storage tank by LNG export pipeline and is stored, and not liquefied natural gas enters torch by flare discharge pipeline
System.
The rapid Start-Up system proposed according to the present invention, wherein the fast precooling system includes fast precooling pipeline, original
Expect that gas suction line, the fast precooling pipeline are connected from LNG rear pump with unstripped gas suction line, and described quickly pre-
Regulating valve and flow instruction are set on cold pipeline.The regulating valve is manually adjusted according to flow instruction.
The rapid Start-Up system proposed according to the present invention, wherein the pre-cooling refrigerant cycle system include precool heat exchanger device,
Refrigerant compressor inlet buffer, pre-cooling refrigerant compressor, pre-cooling refrigerant compressor is pre-chilled and exports cooler.Pre-cooling cryogen passes through
The entrance of the precool heat exchanger device enters pre-cooling switching heat-exchanger heat exchange, passes sequentially through pre- cold pressing from the outlet of the precool heat exchanger device
Contracting machine inlet buffer, pre- cold compressor and pre-cooling compressor outlet cooler, return via the entrance of the precool heat exchanger device
Precool heat exchanger device completes circulation.Three kinds of cryogen, deep cooling cryogen and natural gas media generation heat exchanges are pre-chilled in precool heat exchanger device,
Wherein, cryogen is pre-chilled and provides cooling capacity for other media.
The rapid Start-Up system proposed according to the present invention, wherein the deep cooling refrigerant cycle system includes that pre-cooling cryogen changes
Hot device, deep cooling cryogen knockout drum, deep-cooling heat exchanger, deep cooling refrigerant compressor inlet buffer, deep cooling refrigerant compressor, depth
Cold refrigerant compressor exports cooler.In deep-cooling heat exchanger, heat exchange occurs for natural gas and deep cooling cryogen, and deep cooling cryogen provides
Cooling capacity, 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
Heat exchanger throttles after pressure reducing valve, provides cooling capacity for natural gas liquefaction.Natural gas is liquefied after deep-cooling heat exchanger, into
Enter the LNG stocking system.
The rapid Start-Up system proposed according to the present invention, wherein the storage system LNG storage tank, LNG export pipeline, LNG
Rear pump.The LNG export pipeline connects the deep-cooling heat exchanger and the LNG storage tank, and is 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 pipeline bypass, is connected to flare system by switch valve.Described in unstripped gas after liquefaction passes through
LNG export pipeline enters the LNG storage tank.The unstripped gas that do not liquefy is discharged to flare system by the flare discharge pipeline.Storage tank
Interior LNG enters the fast precooling pipeline by the LNG rear pump.
The rapid Start-Up system proposed according to the present invention, wherein in storage tank LNG by the LNG fast precooling pipeline into
Enter the gas inlet pipeline and is mixed according to mass flow according to 1:5~1:15.
The rapid Start-Up system proposed according to the present invention, wherein by adjusting control valve aperture, rate of temperature fall control is existed
20~40 DEG C/h
The rapid Start-Up system proposed according to the present invention, wherein precool heat exchanger device and deep-cooling heat exchanger are used and changed around tubular type
One or both of hot device or ice chest.
The present invention also provides a kind of rapid Start-Up methods for floating natural gas liquefaction device, comprising:
S1: cryogen and deep cooling cryogen is pre-chilled in emptied part；
S2: pre-cooling refrigerant compressor and its related pressure reducing valve are opened, pre-cooling refrigerant cycle is established；
S3: deep cooling refrigerant compressor and its related pressure reducing valve are opened, deep cooling refrigerant cycle is established；
S4: supplement pre-cooling cryogen and deep cooling cryogen, the pre-cooling refrigerant compressor and the deep cooling refrigerant compressor go out
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 not liquefied natural gas discharge to torch；
S6: opening the LNG rear pump that LNG storage tank bottom is arranged in, and makes the LNG in LNG storage tank by fast precooling pipeline
Precool heat exchanger is mixed into according to a certain percentage (mass flow is according to 1:5~1:15) into gas inlet pipeline and natural gas
Device；
S7: gradually increasing the flow of LNG, and the rate of temperature fall for keeping gas outlet stable is in 20~40 DEG C/h；
S8: when natural gas is all liquefied, flare discharge valve is closed；The flow of natural gas is gradually increased, temperature is observed
The temperature of transmitter indicates, natural gas is kept to go out liquid status；
S9: when liquid is stablized out, 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 value, natural gas flow
Amount, which is adjusted, arrives design value, and driving precooling process terminates.Compared with prior art, present invention uses the cooling capacity of LNG in LNG storage tank
Instead of the cooling capacity of part pre-cooling and deep cooling cryogen, reduce the time required for establishing refrigerant cycle, and then greatly shorten out
The vehicle time, torch gas discharges during reducing driving, and greatly improves device to the adaptability of maritime environment.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of one specific embodiment of rapid Start-Up system of the invention.
Description of symbols: 1- switch valve；2- regulating valve；3- raw material gas pipeline；4- precool heat exchanger device；The heat exchange of 5- deep cooling
Device；6- pressure transmitter；7- temperature transmitter；8- flow transmitter；9- control valve；10- flare discharge pipeline；11- switch valve；
12-LNG export pipeline；13-LNG rear pump；14-LNG storage tank；15- switch valve；The instruction of 16- flow；17- flow control valve；
18-LNG fast precooling pipeline；Refrigerant compressor inlet buffer is pre-chilled in 19-；Refrigerant compressor is pre-chilled in 20-；Cryogen is pre-chilled in 21-
Compressor outlet cooler；22- deep cooling refrigerant compressor inlet buffer；23- deep cooling refrigerant compressor；24- deep cooling cryogen pressure
Contracting machine exports cooler；25- deep cooling cryogen knockout drum；26- pressure reducing valve；27- pressure reducing valve.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that the described embodiment is only a part of the embodiment of the present invention, instead of all the embodiments.Based on this
Embodiment in invention, those of ordinary skill in the art's every other reality obtained under that premise of not paying creative labor
Example is applied, shall fall within the protection scope of the present invention.
Referring to Fig. 1, being the structural schematic diagram of one specific embodiment of rapid Start-Up system of the invention.As shown in Figure 1, this
The rapid Start-Up system of invention includes precool heat exchanger device 4, and the input terminal of the precool heat exchanger device 4 passes through switch valve 1 and regulating valve 2
Unstripped gas is connected, the output end of the precool heat exchanger device 4 is sequentially connected pre-cooling suction port of compressor surge tank 19, pre- cold compressor 20
The precool heat exchanger is connected to the output end of pre-cooling compressor outlet cooler 21, the pre-cooling compressor outlet cooler 21
The input terminal of device 4.
The input terminal 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 terminal 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 pipeline 12, the flare discharge pipeline 10 are connected to by a switch valve 11
Torch；The LNG export pipeline 12 is connected to LNG storage tank 14.
The bottom of the LNG storage tank 14 is provided with LNG rear pump 13, the output end of the LNG rear pump 13 successively connects
Connect flow indicator 16, flow control valve 17 and LNG fast precooling pipeline 18, the output end of the LNG fast precooling pipeline 18
It is connected to the input terminal of the precool heat exchanger device 4.
The present invention is as follows according to the detailed process for the starting method that above-mentioned rapid Start-Up system is formed:
S1: cryogen and deep cooling cryogen is pre-chilled in emptied part；
S2: pre-cooling refrigerant compressor 20 and related pressure reducing valve are opened, pre-cooling refrigerant cycle is established；
S3: deep cooling refrigerant compressor 23, pressure reducing valve 26 and pressure reducing valve 27 are opened, deep cooling refrigerant cycle is established；
S4: supplement pre-cooling cryogen and deep cooling cryogen, two compressor outlet pressures are stepped up；
S5: after refrigerant cycle is established, opening switch valve 1, and the aperture of regulating valve 2 is small flow, and natural gas is introduced and is pre-chilled
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 not liquefied natural gas discharge to torch；
S6: opening LNG rear pump 13, closes valve 15, opens control valve 17, makes the LNG in storage tank by fast precooling
Pipeline 18 enters gas inlet pipeline and natural gas and is mixed into precool heat exchanger device according to the ratio of mass flow 1:10.Pass through
Control valve 2 and control valve 17 adjust the mixed proportion of unstripped gas and LNG, control the cooling rate of gas outlet；
S7: as two refrigerant compressor outlet pressures step up, refrigeration effect is stepped up, precool heat exchanger device and depth
Cold heat exchanger temperature gradually decreases.To accelerate cooling velocity, it is stepped up the aperture of control valve 17, increases the flow of LNG, is maintained
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 no more 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, observation temperature transmitter 7
Temperature instruction, keeps natural gas to go out liquid status；
S9: when liquid is stablized out, being gradually reduced the aperture of control valve 17, until closing.Gradually increase opening for control valve 2
Degree.When refrigerant compressor outlet pressure and inlet temperature have reached design value, gas discharge is adjusted to design value.It drives
Precooling process terminates.
Those of ordinary skill in the art will appreciate that: attached drawing is the schematic diagram of one embodiment, and the pre-cooling in attached drawing is changed
Hot device and deep-cooling heat exchanger use one of ice chest or wound tube heat exchanger, and the module or process in attached drawing are not necessarily
Implement necessary to the present invention.
Those of ordinary skill in the art will appreciate that: the module in device in embodiment can describe to divide according to embodiment
It is distributed in the device of embodiment, corresponding change can also be carried out and be located in one or more devices different from the present embodiment.On
The module for stating embodiment can be merged into a module, can also be further split into multiple submodule.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used
To modify to technical solution documented by previous embodiment or equivalent replacement of some of the technical features；And
These are modified or replaceed, the spirit and model of technical solution of the embodiment of the present invention that it does not separate the essence of the corresponding technical solution
It encloses.
Claims (9)
1. a kind of rapid Start-Up method for floating natural gas liquefaction device characterized by comprising
S1: cryogen and deep cooling cryogen is pre-chilled in emptied part；
S2: pre-cooling refrigerant compressor and its related pressure reducing valve are opened, pre-cooling refrigerant cycle is established；
S3: deep cooling refrigerant compressor and its related pressure reducing valve are opened, deep cooling refrigerant cycle is established；
S4: supplement pre-cooling cryogen and deep cooling cryogen, the outlet pressure of the pre-cooling 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 not liquefied natural gas discharge to torch；
S6: opening the LNG rear pump that LNG storage tank bottom is arranged in, and enters the LNG in LNG storage tank by fast precooling pipeline
Gas inlet pipeline and natural gas are mixed into precool heat exchanger device according to the ratio of mass flow 1:5~1:15；
S7: gradually increasing the flow of LNG, and the rate of temperature fall for maintaining gas outlet stable is in 20~40 DEG C/h；
S8: when the temperature of temperature transmitter reaches setting value, flare discharge valve is closed；The flow of natural gas is gradually increased, is seen
The temperature instruction for examining temperature transmitter, keeps natural gas to go out liquid status；
S9: when liquid is stablized out, the aperture of flow control valve is gradually reduced until closing, gradually increases 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 value, gas discharge tune
Design value is saved, driving precooling process terminates.
2. a kind of for implementing the rapid Start-Up system of the floating natural gas liquefaction device of rapid Start-Up method described in claim 1
System, which is characterized in that including LNG fast precooling system, refrigerant cycle system, deep cooling refrigerant cycle system and storage system is pre-chilled
System；
Fast precooling system is used to cool down unstripped gas, including fast precooling pipeline and related valve, fast precooling pipe
Line is connected with raw material gas pipeline, and LNG in storage tank is mixed with unstripped gas；
Refrigerant cycle system is pre-chilled, unstripped gas is provided and deep cooling cryogen be pre-chilled required cooling capacity, including precool heat exchanger device,
Refrigerant compressor, pre-cooling refrigerant compressor inlet buffer, pre-cooling refrigerant compressor is pre-chilled and exports cooler；Cryogen is pre-chilled to pass through
Become gas phase after precool heat exchanger device heat release, sequentially enters pre-cooling refrigerant compressor inlet buffer, pre-cooling refrigerant compressor, pre-cooling
Refrigerant compressor exports cooler, finally returns to precool heat exchanger device entrance, completes pre-cooling refrigerant cycle；
Deep cooling refrigerant cycle system, for cooling capacity needed 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 export 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 entered after mixing deep cooling refrigerant compressor inlet buffer, deep cooling refrigerant compressor, deep cooling refrigerant compressor outlet it is cold
But device finally returns to precool heat exchanger device entrance, completes deep cooling refrigerant cycle；
Storage system, including LNG export pipeline, LNG storage tank, LNG rear pump and flare discharge pipeline, the natural gas warp after liquefaction
It crosses LNG export pipeline to import into LNG storage tank storage, not liquefied natural gas enters flare system by flare discharge pipeline.
3. rapid Start-Up system according to claim 2, which is characterized in that the fast precooling system includes fast precooling
Pipeline, unstripped gas suction line, the fast precooling pipeline are connected from LNG rear pump with unstripped gas suction line, and described
Regulating valve and flow instruction are set on fast precooling pipeline；The regulating valve is manually adjusted according to flow instruction.
4. rapid Start-Up system according to claim 2, which is characterized in that the pre-cooling refrigerant cycle system includes pre-cooling
Heat exchanger, pre-cooling refrigerant compressor inlet buffer, pre-cooling refrigerant compressor, pre-cooling refrigerant compressor export cooler；Pre-cooling
Cryogen enters pre-cooling switching heat-exchanger heat exchange by the entrance of the precool heat exchanger device, successively leads to from the outlet of the precool heat exchanger device
Pre-cooling suction port of compressor surge tank, pre- cold compressor and pre-cooling compressor outlet cooler are crossed, via the precool heat exchanger device
Entrance returns to precool heat exchanger device and completes circulation, and three kinds of cryogen, deep cooling cryogen and natural gas medium hairs are pre-chilled in precool heat exchanger device
Heat exchange, wherein pre-cooling cryogen provides cooling capacity for other media.
5. rapid Start-Up system according to claim 2, which is characterized in that the deep cooling refrigerant cycle system includes pre-cooling
Cryogen heat exchanger, deep cooling cryogen knockout drum, deep-cooling heat exchanger, deep cooling refrigerant compressor inlet buffer, deep cooling cryogen pressure
Contracting machine, deep cooling refrigerant compressor export cooler；In deep-cooling heat exchanger, heat exchange, deep cooling occur for natural gas and deep cooling cryogen
Cryogen provides cooling capacity, and by natural gas liquefaction, deep cooling cryogen is partly condensed after the precool heat exchanger device, gas-liquid two-phase difference
It into deep-cooling heat exchanger, throttles after pressure reducing valve, provides cooling capacity, natural gas quilt after deep-cooling heat exchanger for natural gas liquefaction
Liquefaction, into the LNG stocking system.
6. rapid Start-Up system according to claim 2, which is characterized in that the storage system LNG storage tank, LNG output
Pipeline, LNG rear pump, the LNG export pipeline 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 pipeline bypass, is connected to flare system by switch valve；Unstripped gas after liquefaction
Enter the LNG storage tank by the LNG export pipeline；The unstripped gas that do not liquefy is discharged to torch system by the flare discharge pipeline
System；LNG enters the fast precooling pipeline by the LNG rear pump in storage tank.
7. rapid Start-Up system according to claim 3, which is characterized in that LNG passes through the LNG fast precooling in storage tank
Pipeline enters the gas inlet pipeline and mixes according to mass flow according to 1:5~1:15.
8. rapid Start-Up system according to claim 6, which is characterized in that by adjusting control valve aperture, by cooling speed
Rate is controlled in 20~40 DEG C/h.
9. rapid Start-Up system according to claim 2, which is characterized in that precool heat exchanger device and deep-cooling heat exchanger use around
One of pipe heat exchanger or ice chest.
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| CA3109908A1 (en) | 2018-08-22 | 2020-02-27 | Exxonmobil Upstream Research Company | Primary loop start-up method for a high pressure expander process |
| SG11202100716QA (en) | 2018-08-22 | 2021-03-30 | Exxonmobil Upstream Res Co | Managing make-up gas composition variation for a high pressure expander process |
| CA3109750A1 (en) | 2018-08-22 | 2020-02-27 | Exxonmobil Upstream Research Company | Heat exchanger configuration for a high pressure expander process and a method of natural gas liquefaction using the same |
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