CN105737515A - Natural gas liquefaction system and method based on plate heat exchanger and modular mixed refrigerant - Google Patents
Natural gas liquefaction system and method based on plate heat exchanger and modular mixed refrigerant Download PDFInfo
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- CN105737515A CN105737515A CN201610153928.2A CN201610153928A CN105737515A CN 105737515 A CN105737515 A CN 105737515A CN 201610153928 A CN201610153928 A CN 201610153928A CN 105737515 A CN105737515 A CN 105737515A
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- mix refrigerant
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 337
- 239000003507 refrigerant Substances 0.000 title claims abstract description 268
- 239000003345 natural gas Substances 0.000 title claims abstract description 168
- 238000000034 method Methods 0.000 title abstract description 25
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 97
- 238000001816 cooling Methods 0.000 claims abstract description 51
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 48
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 47
- 239000004215 Carbon black (E152) Substances 0.000 claims abstract description 28
- 230000006835 compression Effects 0.000 claims abstract description 27
- 238000007906 compression Methods 0.000 claims abstract description 27
- 229930195733 hydrocarbon Natural products 0.000 claims abstract description 27
- 150000002430 hydrocarbons Chemical class 0.000 claims abstract description 27
- 239000007789 gas Substances 0.000 claims abstract description 23
- 238000005057 refrigeration Methods 0.000 claims abstract description 19
- 238000003860 storage Methods 0.000 claims abstract description 13
- 239000000203 mixture Substances 0.000 claims description 159
- 239000007791 liquid phase Substances 0.000 claims description 53
- 239000012808 vapor phase Substances 0.000 claims description 51
- 230000008676 import Effects 0.000 claims description 41
- 239000003949 liquefied natural gas Substances 0.000 claims description 36
- 239000007788 liquid Substances 0.000 claims description 11
- 239000007792 gaseous phase Substances 0.000 claims description 8
- 239000000110 cooling liquid Substances 0.000 claims description 6
- 230000018044 dehydration Effects 0.000 claims description 6
- 238000006297 dehydration reaction Methods 0.000 claims description 6
- 238000000926 separation method Methods 0.000 claims description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 4
- 230000036772 blood pressure Effects 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 238000004064 recycling Methods 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 239000002994 raw material Substances 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 2
- 238000000746 purification Methods 0.000 abstract 2
- 238000003795 desorption Methods 0.000 abstract 1
- 239000003245 coal Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010396 two-hybrid screening 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
- F25J1/0002—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
- F25J1/02—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
- F25J1/0228—Coupling of the liquefaction unit to other units or processes, so-called integrated processes
- F25J1/0235—Heat exchange integration
- F25J1/0237—Heat exchange integration integrating refrigeration provided for liquefaction and purification/treatment of the gas to be liquefied, e.g. heavy hydrocarbon removal from 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
- 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
- F25J1/0212—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 single flow MCR 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
- F25J1/0257—Construction and layout of liquefaction equipments, e.g. valves, machines
- F25J1/0262—Details of the cold heat exchange system
- F25J1/0264—Arrangement of heat exchanger cores in parallel with different functions, e.g. different cooling streams
- F25J1/0265—Arrangement of heat exchanger cores in parallel with different functions, e.g. different cooling streams comprising cores associated exclusively with the cooling of a refrigerant stream, e.g. for auto-refrigeration or economizer
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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
- F25J5/00—Arrangements of cold exchangers or cold accumulators in separation or liquefaction plants
-
- 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
- F25J2205/00—Processes or apparatus using other separation and/or other processing means
- F25J2205/20—Processes or apparatus using other separation and/or other processing means using solidification of components
-
- 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
- F25J2220/00—Processes or apparatus involving steps for the removal of impurities
- F25J2220/60—Separating impurities from natural gas, e.g. mercury, cyclic hydrocarbons
- F25J2220/64—Separating heavy hydrocarbons, e.g. NGL, LPG, C4+ hydrocarbons or heavy condensates in general
-
- 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
- F25J2220/00—Processes or apparatus involving steps for the removal of impurities
- F25J2220/60—Separating impurities from natural gas, e.g. mercury, cyclic hydrocarbons
- F25J2220/66—Separating acid gases, e.g. CO2, SO2, H2S or RSH
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Separation By Low-Temperature Treatments (AREA)
Abstract
The invention provides a natural gas liquefaction system and method based on a plate heat exchanger and a modular mixed refrigerant. The system comprises a plate heat exchanger liquefaction cold box module, a carbon dioxide purification module, a mixed refrigerant compression module and a natural gas storage module; the plate heat exchanger liquefaction cold box module is successively connected with the carbon dioxide purification module and the natural gas storage module to form a natural gas liquefaction loop; the mixed refrigerant compression module is connected with the plate heat exchanger liquefaction cold box module to form a refrigerant refrigeration circulation loop; the natural gas liquefaction loop is used for dehydrating, cooling, removing heavy hydrocarbon, cooling and liquefying, and reducing the pressure of natural gas as a raw materials, and then storing the natural gas; and the refrigerant refrigeration circulation loop is used for circularly using the mixed refrigerant to cool the natural gas. A liquefaction technology is simple in technological process, the number of equipment is small, energy consumption is low, and the natural gas liquefaction system is integrated with a carbon dioxide desorption module, and meanwhile has relatively high adaptability to different gas sources.
Description
Technical field
The present invention relates to chemical industry and cryogenic engineering technical field, in particular it relates to one is based on plate type heat exchanger modularity mix refrigerant natural gas liquefaction system and method.
Background technology
Natural gas and oil, coal, as fossil energy main in the world, occupy very big ratio in primary energy.Natural gas, as a kind of high-quality clean energy resource, is started to pay attention to by increasing country.
Along with continuing to optimize of China's energy resource structure increases with the continuous of natural gas consumption demand, the present situation that China overwhelming majority gas field reserves are all little in addition, China's natural gas insufficiency of supply-demand is continuing to increase.It was predicted that the supply breach to the year two thousand twenty China's natural gas will reach 1000 × 108m3。
On the other hand, there is the less marginal gas field of big volume production reserves, association gas field, coal bed gas field in China, individual well reserves are less, and distance gas transmission pipeline net work is farther out, adopt pipe transmission method not meet economic benefit to utilize without obtaining effective exploitation, ignited torch emptying for a long time.Modularity natural gas liquefaction device can effectively utilize these natural gas resources, pass through technique extension, modularity natural gas liquefaction device is equally applicable to biological flue gas (including municipal refuse landfill gas) and purifies with liquefaction, sea containing associated gas, the liquefaction of part coke-stove gas, coal seam natural gas (gas), shale gas exploitation etc., and market prospect is very wide.
Natural gas liquefaction flow process mainly has this three class of mix refrigerant liquefaction flow path, Expander-Cycle and Cascade.Existing natural gas liquefaction process is primarily directed to Basicloadtype natural gas liquefaction plant and designs, and China also compares and lacks of small-sized skid-mounted natural gas liquefaction device and individually designed liquefaction flow path.Mix refrigerant liquefaction flow path is widely used in big-and-middle-sized natural gas liquefaction plant due to the feature that energy consumption is low.But for small-sized skid-mounted natural gas liquefaction device, mix refrigerant liquefaction flow path relative complex.
Through retrieval, patent publication No. CN102477327A, name is called the patent of " a kind of middle-size and small-size natural gas liquefaction process ", disclose a kind of middle-size and small-size natural gas liquefaction process, in this technique, mix refrigerant adopts two-stage gas-liquid separation, having three heat exchangers, flow process is more complicated, is not suitable for modularity natural gas liquefaction device.
Patent publication No. CN102445052A, name is called the patent of " a kind of biogas liquefied technique for scattered originating point and device ", double; two hybrid refrigeration cycle is adopted to liquefy the biogas of scattered gas source point, owing to this technique is made up of two independent kind of refrigeration cycle, equipment is more, and flow process is complicated, is unfavorable for EM equipment module, the component of biogas and the compositional difference of natural gas are relatively big simultaneously, therefore can not be applied to modularity natural gas liquefaction device.
Existing natural gas liquefaction flow process is very high for the requirement of purifying device for natural gas, because conventional liquefaction ice chest adopts plate-fin heat exchanger, and plate-fin heat exchanger runner is very little, if purifying device for natural gas can not carbon dioxide eliminating to low-down content, under low temperature, drikold is very easy to the runner of blocking plate fin heat exchanger.Purifying device for natural gas typically constitutes from about the half of natural gas liquefaction device gross investment, if therefore can invent a kind of liquefaction to purify integrated process, will be greatly saved equipment investment, and facilitate EM equipment module, removableization simultaneously.
Summary of the invention
For defect of the prior art, it is an object of the invention to provide a kind of based on plate type heat exchanger modularity mix refrigerant natural gas liquefaction system and method.
According to provided by the invention based on plate type heat exchanger modularity mix refrigerant natural gas liquefaction system, including: plate type heat exchanger liquefaction ice chest module, purifying carbon dioxide module, mix refrigerant compression module and natural gas storing module；Described plate type heat exchanger liquefaction ice chest module is connected with purifying carbon dioxide module, natural gas storing module successively and constitutes natural gas liquefaction path；Described mix refrigerant compression module is connected with plate type heat exchanger liquefaction ice chest module and constitutes chiller refrigeration closed circuit；Wherein,
Described natural gas liquefaction loop is for storing raw natural gas after dehydration, cooling, removal heavy hydrocarbon, cooling liquid blood pressure lowering；
Described chiller refrigeration closed circuit is used for recycling mix refrigerant cooled natural gas.
Preferably, described plate type heat exchanger liquefaction ice chest module includes: vapor phase refrigerant precooler, liquid phase refrigerant precooler, natural gas precool heat exchanger device, heavy hydrocarbon separator, liquid phase refrigerant throttling arrangement, mix refrigerant diverter, mix refrigerant one-level blender, natural gas deep-cooling heat exchanger, vapor phase refrigerant throttling arrangement, liquefied natural gas choke valve, mix refrigerant secondary mixer；Wherein, in described natural gas liquefaction loop: the gas outlet of natural gas precool heat exchanger device is connected with the import of heavy hydrocarbon separator；The gaseous phase outlet of heavy hydrocarbon separator is connected with the import of the Imported gas of natural gas deep-cooling heat exchanger, purifying carbon dioxide module successively；The liquid-phase outlet of purifying carbon dioxide module is connected with the import of liquefied natural gas throttling arrangement, LNG storage module successively.
Preferably, described purifying carbon dioxide module includes: carbon dioxide separator, and described carbon dioxide separator is solid-liquid separator；Described natural gas storing module includes: LNG tank.
Preferably, described mix refrigerant compression module includes: the mix refrigerant stage compressor that is sequentially connected, stage compressor cooler, mix refrigerant split-compressor, split-compressor cooler, wherein, the import of mix refrigerant stage compressor constitutes the import of mix refrigerant compression module, the outlet of the export mixes mix refrigerant compression module of split-compressor cooler.
Preferably, in described chiller refrigeration closed circuit: the outlet of described mix refrigerant compression module is connected with the import of mix refrigerant separator；Two gaseous phase outlets of described mix refrigerant separator are divided into two-way, and a road again passes by natural gas deep-cooling heat exchanger after sequentially passing through vapor phase refrigerant precooler, natural gas deep-cooling heat exchanger, vapor phase refrigerant throttling arrangement and the import with mix refrigerant one-level blender is connected；Another road is connected with the import of mix refrigerant one-level blender after sequentially passing through liquid phase refrigerant precooler, liquid phase refrigerant throttling arrangement, the outlet of described mix refrigerant one-level blender is divided into three tunnels, is connected with the import of mix refrigerant secondary mixer respectively through after vapor phase refrigerant precooler, liquid phase refrigerant precooler, natural gas precool heat exchanger device；The outlet of described mix refrigerant secondary mixer is connected with the import of mix refrigerant compressor module.
Preferably, described vapor phase refrigerant throttling arrangement and liquid phase refrigerant throttling arrangement are choke valve or liquid expander.
Preferably, refrigerant storage and proportion unit, instrument control unit, instrument wind and PSA nitrogen module and generator module are also included.
According to provided by the invention based on plate type heat exchanger modularity mix refrigerant natural gas liquefaction, apply above-mentioned based on plate type heat exchanger modularity mix refrigerant natural gas liquefaction system, comprise the steps:
Step A: raw natural gas enters heavy hydrocarbon separator after removing moisture and impurity through dehydration device after natural gas precool heat exchanger device cooling down, remove the natural gas after heavy hydrocarbon and enter natural gas deep-cooling heat exchanger cooling liquid, after being depressurized to LNG storage pressure by liquefied natural gas throttling arrangement after the carbon dioxide that carbon dioxide separation module removes in natural gas, enter LNG tank；
Step B: the blended refrigerant compression module supercharging of mix refrigerant, cooling, entering mix refrigerant gas-liquid separator, isolated vapor phase refrigerant provides cold through the throttling cooling of vapor phase refrigerant throttling arrangement for natural gas deep-cooling heat exchanger after vapor phase refrigerant precooler and natural gas deep-cooling heat exchanger cool down；Isolated liquid phase refrigerant after liquid phase refrigerant precooler cools down by being divided into three strands of cold-producing mediums respectively natural gas precool heat exchanger device, liquid phase refrigerant precooler and vapor phase refrigerant precooler offer cold with after mixing from natural gas deep-cooling heat exchanger vapor phase refrigerant out through mix refrigerant diverter after the throttling cooling of liquid phase refrigerant throttling arrangement；There is provided after cold mix refrigerant out to return mix refrigerant compression module after entering the blender mixing of the mix refrigerant second level from described natural gas precool heat exchanger device, liquid phase refrigerant precooler and vapor phase refrigerant precooler, complete kind of refrigeration cycle.
Preferably, in described step A, raw natural gas enters the pressure of plate type heat exchanger liquefaction ice chest need to be higher than 4.0MPa.
Preferably, the pressure store of the natural gas storage tank in described step A is 0.1MPa.
Compared with prior art, the present invention has following beneficial effect:
1, of the present invention based on plate type heat exchanger modularity mix refrigerant natural gas liquefaction system propose liquefaction purify integration liquefaction process, enormously simplify cleaning equipment, simultaneously facilitate EM equipment module.
2, of the present invention adopt plate type heat exchanger as liquefaction ice chest based on plate type heat exchanger modularity mix refrigerant natural gas liquefaction system, on the one hand because runner is relatively big, require lower than plate-fin heat exchanger ice chest purifying；On the other hand, because the material of plate type heat exchanger is rustless steel, corrosion will not be caused because of the hydrargyrum in natural gas.
3, the simulation calculating passing through the widely used HYSYS software of gas industries based on plate type heat exchanger modularity mix refrigerant natural gas liquefaction system of the present invention, confirm that this liquefaction process energy consumption is low, different source of the gas adaptabilities are relatively strong, it is the liquefaction flow path of the applicable modularity natural gas liquefaction device of comparison；The day output of liquefaction process is 5000～50000Nm3。
Accompanying drawing explanation
By reading detailed description non-limiting example made with reference to the following drawings, the other features, objects and advantages of the present invention will become more apparent upon:
Fig. 1 is the structural representation based on plate type heat exchanger modularity mix refrigerant natural gas liquefaction system；
In figure:
1 is mix refrigerant stage compressor, 2 is stage compressor cooler, 3 is mix refrigerant split-compressor, 4 is split-compressor cooler, 5 is mix refrigerant separator, 6 is vapor phase refrigerant precooler, 7 is liquid phase refrigerant precooler, 8 is natural gas precool heat exchanger device, 9 is heavy hydrocarbon separator, 10 is liquid phase refrigerant throttling arrangement, 11 is mix refrigerant diverter, 12 is mix refrigerant one-level blender, 13 is natural gas deep-cooling heat exchanger, 14 is carbon dioxide separator, 15 is vapor phase refrigerant throttling arrangement, 16 is liquefied natural gas choke valve, 17 is mix refrigerant secondary mixer, 18 is LNG tank.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in detail.Following example will assist in those skilled in the art and are further appreciated by the present invention, but do not limit the present invention in any form.It should be pointed out that, to those skilled in the art, without departing from the inventive concept of the premise, it is also possible to make some changes and improvements.These broadly fall into protection scope of the present invention.
According to the modularity mix refrigerant natural gas liquefaction system based on plate type heat exchanger provided by the invention, including: plate type heat exchanger liquefaction ice chest module, purifying carbon dioxide module, mix refrigerant compression module and natural gas storing module；Described plate type heat exchanger liquefaction ice chest module is connected with purifying carbon dioxide module, natural gas storing module successively and constitutes natural gas liquefaction loop；Described mix refrigerant compression module is connected with plate type heat exchanger liquefaction ice chest module and constitutes chiller refrigeration closed circuit；Wherein,
Described natural gas liquefaction loop is for storing raw natural gas after dehydration, cooling, removal heavy hydrocarbon, cooling liquid blood pressure lowering；
Described chiller refrigeration closed circuit is used for recycling mix refrigerant cooled natural gas.
Described plate type heat exchanger liquefaction ice chest module includes: vapor phase refrigerant precooler 6, liquid phase refrigerant precooler 7, natural gas precool heat exchanger device 8, heavy hydrocarbon separator 9, liquid phase refrigerant throttling arrangement 10, mix refrigerant diverter 11, mix refrigerant one-level blender 12, natural gas deep-cooling heat exchanger 13, vapor phase refrigerant throttling arrangement 15, liquefied natural gas choke valve 16, mix refrigerant secondary mixer 17；Wherein, described natural gas liquefaction loop refers to: the gas outlet of natural gas precool heat exchanger device 8 is connected with the import of heavy hydrocarbon separator 9；The gaseous phase outlet of heavy hydrocarbon separator 9 is connected with the import of the Imported gas of natural gas deep-cooling heat exchanger 13, purifying carbon dioxide module successively；The liquid-phase outlet of purifying carbon dioxide module is connected with the import of liquefied natural gas throttling arrangement 16, LNG storage module successively.
Described purifying carbon dioxide module includes: carbon dioxide separator 14, and described carbon dioxide separator 14 is solid-liquid separator.
Described natural gas storing module includes: LNG tank 18.
Described chiller refrigeration closed circuit refers to: the outlet of described mix refrigerant compression module is connected with the import of mix refrigerant separator 5；Two gaseous phase outlets of described mix refrigerant separator 5 are divided into two-way, and a road is connected with the import of mix refrigerant one-level blender 12 after again passing by natural gas deep-cooling heat exchanger 13 after sequentially passing through vapor phase refrigerant precooler 6, natural gas deep-cooling heat exchanger 13, vapor phase refrigerant throttling arrangement 15；Another road is connected with the import of mix refrigerant one-level blender 12 after sequentially passing through liquid phase refrigerant precooler 7, liquid phase refrigerant throttling arrangement 10, the outlet of described mix refrigerant one-level blender 12 is divided into three tunnels, is connected with the import of mix refrigerant secondary mixer 17 respectively through after vapor phase refrigerant precooler 6, liquid phase refrigerant precooler 7, natural gas precool heat exchanger device 8；The outlet of described mix refrigerant secondary mixer 17 is connected with the import of mix refrigerant compressor module.
Described mix refrigerant compression module includes: the mix refrigerant stage compressor 1 that is sequentially connected, stage compressor cooler 2, mix refrigerant split-compressor 3, split-compressor cooler 4, wherein, the import of mix refrigerant stage compressor 1 constitutes the import of mix refrigerant compression module, the outlet of the export mixes mix refrigerant compression module of split-compressor cooler 4.
Described vapor phase refrigerant throttling arrangement 15 and liquid phase refrigerant throttling arrangement 10 are choke valve or liquid expander.
According to provided by the invention based on plate type heat exchanger modularity mix refrigerant natural gas liquefaction, comprise the steps:
Step A: raw natural gas enters heavy hydrocarbon separator 9 after removing the impurity such as moisture through dehydration device after natural gas precool heat exchanger device 8 cooling down, remove the natural gas after heavy hydrocarbon and enter natural gas deep-cooling heat exchanger 13 cooling liquid, after being depressurized to LNG storage pressure by liquefied natural gas throttling arrangement 16 after the carbon dioxide that carbon dioxide separation module removes in natural gas, enter LNG tank 18；
Step B: the blended refrigerant compression module supercharging of mix refrigerant, cooling, entering mix refrigerant gas-liquid separator 5, isolated vapor phase refrigerant provides cold through vapor phase refrigerant throttling arrangement 15 throttling cooling for natural gas deep-cooling heat exchanger 13 after vapor phase refrigerant precooler 6 and natural gas deep-cooling heat exchanger 13 cool down；Isolated liquid phase refrigerant after liquid phase refrigerant precooler 7 cools down by being divided into three strands of cold-producing mediums respectively natural gas precool heat exchanger device 8, liquid phase refrigerant precooler 7 and vapor phase refrigerant precooler 6 to provide cold with after mixing from natural gas deep-cooling heat exchanger 13 vapor phase refrigerant out through mix refrigerant diverter 11 after liquid phase refrigerant throttling arrangement 10 throttling cooling；After providing cold from described natural gas precool heat exchanger device 8, liquid phase refrigerant precooler 7 and vapor phase refrigerant precooler 6, mix refrigerant out returns mix refrigerant compression module after entering blender 17 mixing of the mix refrigerant second level, completes kind of refrigeration cycle.
In described step A, raw natural gas enters the pressure of plate type heat exchanger liquefaction ice chest need to be higher than 4.0MPa.
The pressure store of the natural gas storage tank in described step A is 0.1MPa.
Mix refrigerant raw material in described step B is by C1-C4Hydrocarbon and N2The mix refrigerant of composition.
As shown in Figure 1, including: mix refrigerant stage compressor 1, stage compressor cooler 2, mix refrigerant split-compressor 3, split-compressor cooler 4, mix refrigerant separator 5, vapor phase refrigerant precooler 6, liquid phase refrigerant precooler 7, natural gas precool heat exchanger device 8, heavy hydrocarbon separator 9, liquid phase refrigerant throttling arrangement 10, mix refrigerant diverter 11, mix refrigerant one-level blender 12, natural gas deep-cooling heat exchanger 13, carbon dioxide separator 14, vapor phase refrigerant throttling arrangement 15, liquefied natural gas choke valve 16, mix refrigerant secondary mixer 17, LNG tank 18.
Specifically, the system in the present invention includes: natural gas liquefaction loop and mix refrigerant refrigeration cycle；Concrete composition is as follows respectively:
Being specifically configured to of natural gas liquefaction loop: natural gas precool heat exchanger device 8, heavy hydrocarbon separator 9, natural gas deep-cooling heat exchanger 13, carbon dioxide separator 14, liquefied natural gas choke valve 16 and LNG tank 18 are sequentially connected；The import of the gaseous phase outlet of described heavy hydrocarbon separator 9 and natural gas deep-cooling heat exchanger 13, carbon dioxide separator 14 is sequentially connected；The import of described carbon dioxide separator 14 liquid-phase outlet and liquefied natural gas choke valve 16, LNG tank 18 is sequentially connected.
Being specifically configured to of mix refrigerant refrigeration cycle: the import of mix refrigerant stage compressor 1, stage compressor cooler 2, mix refrigerant split-compressor 3, split-compressor cooler 4 and mix refrigerant separator 5 is sequentially connected, the gaseous phase outlet of described mix refrigerant 5 is connected with the import of vapor phase refrigerant precooler 6, natural gas deep-cooling heat exchanger 13 and vapor phase refrigerant throttling arrangement 15 successively；The liquid-phase outlet of described mix refrigerant 5 is connected with the import of liquid phase refrigerant precooler 7, liquid phase refrigerant throttling arrangement 10 successively；The outlet of described vapor phase refrigerant throttling arrangement 15 is connected with the import of natural gas deep-cooling heat exchanger 13 successively, mix refrigerant one-level blender 12；The outlet of described liquid phase refrigerant throttling arrangement 10 is connected with the import of mix refrigerant one-level blender 12；The described outlet of mix refrigerant one-level blender 12 is connected with the import of mix refrigerant diverter 11；The outlet of described mix refrigerant diverter 11 respectively with vapor phase refrigerant precooler 6, liquid phase refrigerant precooler 7, natural gas precool heat exchanger device 8 import be connected；The outlet of natural gas precool heat exchanger device 8 connects the import of mix refrigerant secondary mixer 17, and the outlet of mix refrigerant secondary mixer 17 is connected with the import of mix refrigerant stage compressor 1.
The equipment of the present invention can form several module, it is simple to production and transport, and changes source of the gas；Specific as follows:
Mix refrigerant stage compressor 1, stage compressor cooler 2, mix refrigerant split-compressor 3, split-compressor cooler 4 constitutes mix refrigerant compression module.
Plate type heat exchanger liquefaction ice chest module includes: vapor phase refrigerant precooler 6, liquid phase refrigerant precooler 7, natural gas precool heat exchanger device 8, heavy hydrocarbon separator 9, liquid phase refrigerant throttling arrangement 10, mix refrigerant diverter 11, mix refrigerant one-level blender 12, natural gas deep-cooling heat exchanger 13, vapor phase refrigerant throttling arrangement 15 and mix refrigerant secondary mixer 17.
Purifying carbon dioxide module includes: carbon dioxide separator 14.
Natural gas storing module includes: LNG tank 18 constitutes liquefaction.
The method based on the modularity mix refrigerant natural gas liquefaction system liquefied natural gas of plate type heat exchanger of the application present invention is specifically shown in following example:
Embodiment
Natural gas molar constituent 93%CH4+ 4%C3H8+ 2%N2+ 1%CO2, pressure 4.0MPa, temperature 40 DEG C, flow 1kmol/h；Mix refrigerant flow 2.68kmol/h.The specifically comprising the following steps that of modularity mix refrigerant natural gas liquefaction process based on plate type heat exchanger
1, gas material is cooled to-40 DEG C through natural gas precool heat exchanger device；
2, the natural gas after step cools down enters heavy hydrocarbon separator 9, obtains heavy hydrocarbon from 2, the end；
3, remove the natural gas deep-cooling heat exchanger 13 after heavy hydrocarbon through step 2 and be cooled to-15 DEG C；
4, the natural gas obtained through step 3 enters carbon dioxide separator 14, and liquefied natural gas flows out from carbon dioxide separator 14 top, and drikold is separated bottom carbon dioxide separator 14；
5, the liquefied natural gas after step 4 carbon dioxide removal is after liquefied natural gas choke valve 16 reducing pressure by regulating flow to 0.1MPa, enters LNG tank 18；
6, mix refrigerant raw material first passes through after mix refrigerant stage compressor 1 is pressurized to 0.83MPa, enters stage compressor cooler 2 and is cooled to 40 DEG C；
7, the mix refrigerant after step 6 cools down is after mix refrigerant split-compressor 3 is pressurized to 3.01MPa, enters split-compressor cooler 4 and is cooled to 40 DEG C；
8, the mix refrigerant after step 7 cools down becomes gas-liquid two-phase entrance mix refrigerant separator 5, vapor phase refrigerant is after vapor phase refrigerant precooler 6 is cooled to-40 DEG C, it is depressurized to 0.255MPa by vapor phase refrigerant throttling arrangement 15 after being cooled to-160 DEG C then through natural gas deep-cooling heat exchanger 13, temperature reduces to-165.02 DEG C, provides cold for natural gas deep-cooling heat exchanger 13；
9, separating, through step 7 mix refrigerant separator 5, the liquid phase refrigerant obtained and be cooled to-40 DEG C through liquid phase refrigerant precooler 7, be depressurized to 0.255MPa through liquid phase refrigerant throttling arrangement 10, temperature reduces to-48.23 DEG C；
10, vapor phase refrigerant after step 8 and 9 and liquid phase refrigerant are after mix refrigerant one-level blender 12 mixes, temperature becomes-47.38 DEG C, then pass through mix refrigerant diverter 11 and be divided into three strands of cold-producing mediums, after respectively vapor phase refrigerant precooler 6, liquid phase refrigerant precooler 7 and natural gas precool heat exchanger device 8 provide cold, temperature returns mix refrigerant stage compressor 1 after becoming 36.64 DEG C and completes kind of refrigeration cycle.
Calculate through simulation, should be 0.332kWh/Nm based on the specific energy consumption of the modularity mix refrigerant natural gas liquefaction process of plate type heat exchanger3.After carbon dioxide separator 14, the carbon dioxide content in liquefied natural gas is 500ppm, and compared to carbon dioxide content 1% in unstripped gas, major part carbon dioxide is all by carbon dioxide separator 14 separation removal.
Above specific embodiments of the invention are described.It is to be appreciated that the invention is not limited in above-mentioned particular implementation, those skilled in the art can make a variety of changes within the scope of the claims or revise, and this has no effect on the flesh and blood of the present invention.When not conflicting, embodiments herein and the feature in embodiment can arbitrarily be mutually combined.
Claims (10)
1. one kind based on plate type heat exchanger modularity mix refrigerant natural gas liquefaction system, it is characterised in that including: plate type heat exchanger liquefaction ice chest module, purifying carbon dioxide module, mix refrigerant compression module and natural gas storing module；Described plate type heat exchanger liquefaction ice chest module is connected with purifying carbon dioxide module, natural gas storing module successively and constitutes natural gas liquefaction path；Described mix refrigerant compression module is connected with plate type heat exchanger liquefaction ice chest module and constitutes chiller refrigeration closed circuit；Wherein,
Described natural gas liquefaction loop is for storing raw natural gas after dehydration, cooling, removal heavy hydrocarbon, cooling liquid blood pressure lowering；
Described chiller refrigeration closed circuit is used for recycling mix refrigerant cooled natural gas.
2. according to claim 1 based on plate type heat exchanger modularity mix refrigerant natural gas liquefaction system, it is characterized in that, described plate type heat exchanger liquefaction ice chest module includes: vapor phase refrigerant precooler (6), liquid phase refrigerant precooler (7), natural gas precool heat exchanger device (8), heavy hydrocarbon separator (9), liquid phase refrigerant throttling arrangement (10), mix refrigerant diverter (11), mix refrigerant one-level blender (12), natural gas deep-cooling heat exchanger (13), vapor phase refrigerant throttling arrangement (15), liquefied natural gas choke valve (16), mix refrigerant secondary mixer (17)；Wherein, in described natural gas liquefaction loop: the gas outlet of natural gas precool heat exchanger device (8) is connected with the import of heavy hydrocarbon separator (9)；The gaseous phase outlet of heavy hydrocarbon separator (9) is connected with the import of the Imported gas of natural gas deep-cooling heat exchanger (13), purifying carbon dioxide module successively；The liquid-phase outlet of purifying carbon dioxide module is connected with the import of liquefied natural gas throttling arrangement (16), LNG storage module successively.
3. according to claim 1 based on plate type heat exchanger modularity mix refrigerant natural gas liquefaction system, it is characterized in that, described purifying carbon dioxide module includes: carbon dioxide separator (14), and described carbon dioxide separator (14) is solid-liquid separator；Described natural gas storing module includes: LNG tank (18).
4. according to claim 2 based on plate type heat exchanger modularity mix refrigerant natural gas liquefaction system, it is characterized in that, described mix refrigerant compression module includes: the mix refrigerant stage compressor (1) being sequentially connected, stage compressor cooler (2), mix refrigerant split-compressor (3), split-compressor cooler (4), wherein, the import of mix refrigerant stage compressor (1) constitutes the import of mix refrigerant compression module, the outlet of the export mixes mix refrigerant compression module of split-compressor cooler (4).
5. according to claim 4 based on plate type heat exchanger modularity mix refrigerant natural gas liquefaction system, it is characterized in that, in described chiller refrigeration closed circuit: the outlet of described mix refrigerant compression module is connected with the import of mix refrigerant separator (5)；Two gaseous phase outlets of described mix refrigerant separator (5) are divided into two-way, and a road again passes by natural gas deep-cooling heat exchanger (13) after sequentially passing through vapor phase refrigerant precooler (6), natural gas deep-cooling heat exchanger (13), vapor phase refrigerant throttling arrangement (15) and the import with mix refrigerant one-level blender (12) is connected；Another road sequentially passes through liquid phase refrigerant precooler (7), liquid phase refrigerant throttling arrangement (10) is connected with the import of mix refrigerant one-level blender (12) afterwards, the outlet of described mix refrigerant one-level blender (12) is divided into three tunnels, is connected with the import of mix refrigerant secondary mixer (17) afterwards respectively through vapor phase refrigerant precooler (6), liquid phase refrigerant precooler (7), natural gas precool heat exchanger device (8)；The described outlet of mix refrigerant secondary mixer (17) is connected with the import of mix refrigerant compressor module.
6. according to claim 2 based on plate type heat exchanger modularity mix refrigerant natural gas liquefaction system, it is characterized in that, described vapor phase refrigerant throttling arrangement (15) and liquid phase refrigerant throttling arrangement (10) are choke valve or liquid expander.
7. according to claim 1 based on plate type heat exchanger modularity mix refrigerant natural gas liquefaction system, it is characterised in that also to include refrigerant storage and proportion unit, instrument control unit, instrument wind and PSA nitrogen module and generator module.
8. one kind based on plate type heat exchanger modularity mix refrigerant natural gas liquefaction, it is characterised in that be applied to according to any one of claim 1 to 7 based on plate type heat exchanger modularity mix refrigerant natural gas liquefaction system, comprise the steps:
Step A: raw natural gas enters heavy hydrocarbon separator (9) after removing moisture and impurity through dehydration device after natural gas precool heat exchanger device (8) cooling down, remove the natural gas after heavy hydrocarbon and enter natural gas deep-cooling heat exchanger (13) cooling liquid, after being depressurized to LNG storage pressure by liquefied natural gas throttling arrangement (16) after the carbon dioxide that carbon dioxide separation module removes in natural gas, enter LNG tank (18)；
Step B: the blended refrigerant compression module supercharging of mix refrigerant, cooling, entering mix refrigerant gas-liquid separator (5), isolated vapor phase refrigerant provides cold through vapor phase refrigerant throttling arrangement (15) throttling cooling for natural gas deep-cooling heat exchanger (13) after vapor phase refrigerant precooler (6) and natural gas deep-cooling heat exchanger (13) cool down；Isolated liquid phase refrigerant after liquid phase refrigerant precooler (7) cools down by being divided into three strands of cold-producing mediums respectively natural gas precool heat exchanger device (8), liquid phase refrigerant precooler (7) and vapor phase refrigerant precooler (6) offer cold with after mixing from natural gas deep-cooling heat exchanger (13) vapor phase refrigerant out through mix refrigerant diverter (11) after liquid phase refrigerant throttling arrangement (10) throttling cooling；There is provided after cold mix refrigerant out to return mix refrigerant compression module after entering mix refrigerant second level blender (17) mixing from described natural gas precool heat exchanger device (8), liquid phase refrigerant precooler (7) and vapor phase refrigerant precooler (6), complete kind of refrigeration cycle.
9. according to claim 8 based on plate type heat exchanger modularity mix refrigerant natural gas liquefaction, it is characterised in that in described step A, raw natural gas enters the pressure of plate type heat exchanger liquefaction ice chest need to be higher than 4.0MPa.
10. according to claim 8 based on plate type heat exchanger modularity mix refrigerant natural gas liquefaction, it is characterised in that the pressure store of the natural gas storage tank in described step A is 0.1MPa.
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