CN201915073U - Mixture refrigerant natural gas liquefaction device using Freon for precooling - Google Patents
Mixture refrigerant natural gas liquefaction device using Freon for precooling Download PDFInfo
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- CN201915073U CN201915073U CN2010206699765U CN201020669976U CN201915073U CN 201915073 U CN201915073 U CN 201915073U CN 2010206699765 U CN2010206699765 U CN 2010206699765U CN 201020669976 U CN201020669976 U CN 201020669976U CN 201915073 U CN201915073 U CN 201915073U
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 306
- 239000003345 natural gas Substances 0.000 title claims abstract description 152
- 239000003507 refrigerant Substances 0.000 title claims abstract description 48
- 239000000203 mixture Substances 0.000 title abstract description 43
- 235000009508 confectionery Nutrition 0.000 claims description 37
- 230000006835 compression Effects 0.000 claims description 34
- 238000007906 compression Methods 0.000 claims description 34
- 229910052731 fluorine Inorganic materials 0.000 claims description 26
- 239000011737 fluorine Substances 0.000 claims description 26
- 238000005057 refrigeration Methods 0.000 claims description 21
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 20
- 238000012546 transfer Methods 0.000 claims description 19
- 150000002221 fluorine Chemical class 0.000 claims description 3
- 125000001153 fluoro group Chemical group F* 0.000 claims description 3
- 238000001816 cooling Methods 0.000 description 9
- 239000003795 chemical substances by application Substances 0.000 description 8
- 239000007788 liquid Substances 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 7
- 239000007789 gas Substances 0.000 description 5
- 238000012545 processing Methods 0.000 description 4
- 239000000110 cooling liquid Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- MBLBDJOUHNCFQT-LXGUWJNJSA-N aldehydo-N-acetyl-D-glucosamine Chemical compound CC(=O)N[C@@H](C=O)[C@@H](O)[C@H](O)[C@H](O)CO MBLBDJOUHNCFQT-LXGUWJNJSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000006200 vaporizer Substances 0.000 description 1
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
- F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
- F25J1/0047—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using an "external" refrigerant stream in a closed vapor compression cycle
- F25J1/0052—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using an "external" refrigerant stream in a closed vapor compression cycle by vaporising a liquid refrigerant stream
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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
- F25J1/0268—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 using a dedicated refrigeration means
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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
- F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
- F25J2230/30—Compression of the feed stream
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2270/00—Refrigeration techniques used
- F25J2270/90—External refrigeration, e.g. conventional closed-loop mechanical refrigeration unit using Freon or NH3, unspecified external refrigeration
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- 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)
- Separation By Low-Temperature Treatments (AREA)
Abstract
The utility model relates to a mixture refrigerant natural gas liquefaction device using Freon for precooling. The device comprises a precooling system, a mixture refrigerant circulating system and a natural gas transportation pipeline, wherein the mixture refrigerant circulating system includes a primary compressor, a primary air cooler, a secondary compressor, a secondary air cooler, a precooling heat exchanger, a low-temperature heat exchanger, a first J-T valve and a second J-T valve. The precooling heat exchanger is provided with a first flow channel and a second flow channel; the low-temperature heat exchanger is provided with a first flow channel, a second flow channel and a third flow channel; the primary compressor, the primary air cooler, the secondary compressor, the secondary air cooler and the first flow channel of the precooling heat exchanger, the third flow channel of the low-temperature heat exchanger and the first J-T valve and the second flow channel of the low-temperature heat exchanger are connected sequentially to form a refrigerant loop; the precooling system is a Freon precooling system and connected with the second flow channel of the precooling heat exchanger to form a loop; and the natural gas transportation pipeline is sequentially connected with the first flow channel of the low-temperature heat exchanger and the second J-T valve.
Description
Technical field
The utility model relates to a kind of natural gas liquefaction device, especially relates to a kind of small-sized mix refrigerant natural gas liquefaction device that adopts the precooling of fluorine Lyons.
Background technology
Sweet natural gas is a kind of fossil energy of high-quality cleaning, and after the natural gas via liquefaction, it is original 1/625 that its volume is about, thereby be convenient to store and transportation.Compare with pipeline gas, natural gas liquids (LNG) has irreplaceable effect aspect the introduction of the development and use of the exploitation in scattered gas field, marginal gas field, the utilization of coal-seam gas, marine Sweet natural gas and overseas Sweet natural gas.
Natural gas liquefaction has compact cascade type refrigeration cycle, mix refrigerant refrigeration cycle and expander refrigeration to circulate three kinds, and wherein mix refrigerant circulation (MRC) employing is the most general, and the service performance of system is the most complicated.Domestic many universities and colleges have all launched the research of this respect, and carried out the teaching and scientific research work of natural gas liquefaction technology, but build the suitable small-scaled natural gas liquification device in laboratory and but be faced with a series of difficulties, all be very limited as investment, power supply, place, Operation and Maintenance etc.If adopt the low-temperature receiver of small-sized refrigerator as natural gas liquefaction, though device is simple, floor space is little and easy and simple to handle, but the natural gas liquefaction of small-sized refrigerator principle of work and industrial common employing circulation is far different, can not help the student to learn and grasp natural gas liquefaction round-robin principle, device and working process, can't obtain the ideal teaching efficiency.
The utility model content
For solving the problems of the technologies described above, the purpose of this utility model is to provide a kind of natural gas liquefaction device, carry out precooling and adopt mix refrigerant that Sweet natural gas is carried out cooling liquid by refrigeration system commonly used, its principle of work and industrial general natural gas liquefaction circulation device are basic identical, have characteristics such as volume is little, simple to operate, cost is low.
For achieving the above object, the utility model provides a kind of natural gas liquefaction device, and it comprises chilldown system, the mix refrigerant recycle system and natural-gas transfer pipeline, it is characterized in that:
The described mix refrigerant recycle system also can be called the cold cycle system or the MRC recycle system, it comprises a stage compressor, main air water cooler (abbreviation air cooler), two stage compressor, secondary air water cooler, precool heat exchanger device, cryogenic heat exchanger, a J-T valve and the 2nd J-T valve, and, be provided with the first flow and second runner in the described precool heat exchanger device, be provided with first flow, second runner and the 3rd runner in the described cryogenic heat exchanger; Wherein, second runner of the 3rd runner of the first flow of a stage compressor, main air water cooler, two stage compressor, secondary air water cooler, precool heat exchanger device, cryogenic heat exchanger, a J-T valve, cryogenic heat exchanger connects successively and forms the loop;
Described chilldown system is fluorine Lyons chilldown system, and this fluorine Lyons chilldown system is connected with second runner of described precool heat exchanger device and forms the loop;
Described natural-gas transfer pipeline is connected with the first flow of described cryogenic heat exchanger, described the 2nd J-T valve successively.
In the natural gas liquefaction device that the utility model provides, preferably, this natural gas liquefaction device also comprises a natural pressure compression system, and this natural pressure compression system comprises one-level natural gas compressor and one-level Sweet natural gas air-cooler, is used for Sweet natural gas is compressed and air cooling.
When the natural gas liquefaction device that provides when the utility model also comprises the natural pressure compression system, preferably, described natural-gas transfer pipeline is connected with the first flow and described the 2nd J-T valve of the one-level natural gas compressor of described natural pressure compression system, one-level Sweet natural gas air-cooler, described cryogenic heat exchanger successively.
In the natural gas liquefaction device that the utility model provides, preferably, described one-level natural gas compressor is piston-type natural gas compressor or screw natural gas compressor.
In the natural gas liquefaction device that the utility model provides, preferably, described natural pressure compression system also comprises secondary natural gas compressor and secondary Sweet natural gas air-cooler, is used for Sweet natural gas is carried out secondary compression and secondary air cooling.
In the natural gas liquefaction device that the utility model provides, when natural air pressure compression system comprises secondary natural gas compressor and secondary Sweet natural gas air-cooler, preferably, described natural-gas transfer pipeline is connected with the first flow and described the 2nd J-T valve of the one-level natural gas compressor of described natural pressure compression system, one-level Sweet natural gas air-cooler, secondary natural gas compressor, secondary Sweet natural gas air-cooler, described cryogenic heat exchanger successively.
In the natural gas liquefaction device that the utility model provides, preferably, described secondary natural gas compressor is piston-type natural gas compressor or screw natural gas compressor.
In the natural gas liquefaction device that the utility model provides, preferably, described fluorine Lyons chilldown system is a vapour compression refrigeration system.More preferably, it can be to be the vapour compression refrigeration system of refrigeration agent with refrigeration agent R407 or R410.
The natural gas liquefaction device that the utility model provides is a kind of small-sized mix refrigerant natural gas liquefaction device that adopts the precooling of fluorine Lyons.In the mix refrigerant recycle system, mix refrigerant circulates in the loop, successively through a stage compressor, main air water cooler, two stage compressor, secondary air water cooler, enter the first flow of precool heat exchanger device, in the precool heat exchanger device, azeotrope is by the refrigeration agent precooling from fluorine Lyons chilldown system; Mix refrigerant enters in the 3rd runner of cryogenic heat exchanger then, further is cooled, then through a J-T valve and by throttling expansion, temperature further reduces, and enter in second runner of cryogenic heat exchanger, cold is provided, be used for the azeotrope of cooled natural gas and precooling the 3rd runner; Leave after second runner, mix refrigerant is got back to a stage compressor along pipeline, begins new circulation.
In chilldown system, fluorine Lyons chilldown system is connected and forms the loop with second runner of precool heat exchanger device and is meant: the outlet of fluorine Lyons chilldown system (the pipeline outlet of coming out from expansion valve) is connected with the inlet of second runner of precool heat exchanger device by a pipeline, and then the outlet of second runner is connected with the inlet of fluorine Lyons chilldown system (getting back to the entrance pipe of cryogen compressor) by another pipeline, thereby form the loop of a sealing, make (fluorine Lyons) refrigeration agent (for example R407 or R410 refrigeration agent) enter second runner of precool heat exchanger device by pipeline, and (evaporation) carries out precooling to the mix refrigerant in the loop of the mix refrigerant recycle system in the precool heat exchanger device, and (fluorine Lyons) refrigeration agent is got back to fluorine Lyons chilldown system along pipeline then.The precool heat exchanger device plays vaporizer in the chilldown system of fluorine Lyons, the low-temperature refrigerant (for example fluorine Lyons liquid) that is obtained by fluorine Lyons chilldown system (for example vapour compression refrigeration system) evaporates in the precool heat exchanger device, and provides cold that the azeotrope (being the azeotrope of the first flow of precool heat exchanger device) from the secondary air water cooler is cooled off.
Natural-gas transfer pipeline is connected with first flow, the 2nd J-T valve of cryogenic heat exchanger successively, makes therein the liquefaction that is cooled through cryogenic heat exchanger time of mobile Sweet natural gas, after through the 2nd J-T valve, is output as the LNG product.When the gas pressure higher (absolute pressure is more than 600kPa) carried, Sweet natural gas can directly enter cryogenic heat exchanger and carry out cooling liquid; When the gas pressure lower (absolute pressure is below 600kPa) carried, can utilize the natural pressure compression system that Sweet natural gas is compressed and air cooling earlier, and then enter cryogenic heat exchanger and carry out cooling liquid; The natural gas liquids that obtains after the cooling is output as the cryogenic LNG product through after the 2nd J-T valve throttling step-down.
The above-mentioned natural gas liquefaction device that the utility model provides is a kind of small-sized liquefying plant, is suitable for using in the laboratory, perhaps is used for daily teaching.This natural gas liquefaction device is by adopting commercial sophisticated fluorine Lyons chilldown system as chilldown system; thereby when adopting this device to carry out natural gas liquefaction; can adopt mix refrigerant proportioning based on light constituent; thereby mix refrigerant all remains gaseous state at one-level azeotrope air-cooler and the outlet of secondary azeotrope air-cooler; avoided common gas-liquid separation in the mix refrigerant flow process; thereby need not knockout drum; also need not increases transferpump or disposes throttling valve separately the liquid cryogen; also need not to detect; the control liquid level also adopts the liquid level sfgd.; thereby farthest simplified flow process, reduced equipment.
Simultaneously, the natural gas liquefaction device that the utility model provides has been realized the mix refrigerant natural gas liquefaction circulation of main flow under laboratory condition, its main device composition, principle of work and service performance are all quite similar with full scale plant, can be used for the teaching of natural gas liquefaction technology preferably, this device also can be used for the experimental study of natural gas liquefaction device service performance in addition.Owing to adopted fluorine Lyons vapor compression refrigeration device precooling mix refrigerant, energy consumption can be controlled on the lower level, reduced requirement to the laboratory power supply.The above-mentioned natural gas liquefaction device that adopts the utility model to provide can obtain the LNG output of 10-200L/h (liquid) in the laboratory.
Description of drawings
The following drawings only is intended to the utility model done and schematically illustrates and explain, does not limit scope of the present utility model.Wherein:
The structural representation of the natural gas liquefaction device that Fig. 1 is adopted for embodiment 1;
The structural representation of the natural gas liquefaction device that Fig. 2 is adopted for embodiment 2;
The structural representation of the natural gas liquefaction device that Fig. 3 is adopted for embodiment 3.
The drawing reference numeral explanation:
One stage compressor, 1; Main air water cooler, 2; Two stage compressor, 3; Secondary air water cooler, 4; Precool heat exchanger device, 5; Cryogenic heat exchanger, 6; The one J-T valve, 7; The 2nd J-T valve, 8; Fluorine Lyons chilldown system, 9; Natural-gas transfer pipeline, 10; One-level natural gas compressor, 11; One-level Sweet natural gas air-cooler, 12; Secondary natural gas compressor, 13; Secondary Sweet natural gas air-cooler, 14.
Embodiment
Understand for technical characterictic of the present utility model, purpose and beneficial effect being had more clearly, the technical solution of the utility model is carried out following detailed description, but but can not be interpreted as qualification practical range of the present utility model referring now to Figure of description.
Embodiment 1
Present embodiment provides a kind of natural gas liquefaction device, and it comprises chilldown system, the mix refrigerant recycle system and natural-gas transfer pipeline, its concrete structure as shown in Figure 1:
The mix refrigerant recycle system comprises a stage compressor (one-level mix refrigerant compressor) 1, main air water cooler (one-level mix refrigerant air-cooler) 2, two stage compressor (secondary mix refrigerant compressor) 3, secondary air water cooler (secondary mix refrigerant air-cooler) 4, precool heat exchanger device 5, cryogenic heat exchanger (ice chest) 6, the one J-T valve (cryogen J-T valve) the 7 and the 2nd J-T valve (Sweet natural gas J-T valve) 8, and, be provided with the first flow and second runner in the precool heat exchanger device 5 (as shown in Figure 1, top is first flow, following is second runner), be provided with first flow in the cryogenic heat exchanger 6, second runner and the 3rd runner (are followed successively by first road as shown in Figure 1, from top to bottom, second runner and the 3rd runner); Wherein, second runner of the first flow of one stage compressor 1, main air water cooler 2, two stage compressor 3, secondary air water cooler 4, precool heat exchanger device 5, the 3rd runner of cryogenic heat exchanger 6, a J-T valve 7, cryogenic heat exchanger 6 connects successively, the outlet of second runner is connected with the inlet of a stage compressor 1, form loop (refrigerant circuit), this is the loop of a sealing, and mix refrigerant can circulate in this loop;
Chilldown system is fluorine Lyons chilldown system 9, and, this fluorine Lyons chilldown system 9 is connected with second runner of precool heat exchanger device 5 and forms the loop, this loop is the loop of a sealing equally, and refrigeration agent can circulate between second runner of fluorine Lyons chilldown system 9 and precool heat exchanger device 5 along this loop;
Natural-gas transfer pipeline 10 is connected with first flow, the 2nd J-T valve 8 of cryogenic heat exchanger 6 successively, so that Sweet natural gas is cooled through cryogenic heat exchanger 6 time.
When the said apparatus that adopts present embodiment to provide carries out the liquefaction of Sweet natural gas, can carry out according to following technology:
In the mix refrigerant recycle system, the mix refrigerant that is adopted has following mole and forms: methane 50-58%, ethene 15-20%, propane 18-26%, nitrogen 3-6%, and its composition can be adjusted according to the operation condition of device; Pressure is that the azeotrope of 240-270kPa at first is compressed to 1000-1500kPa by a stage compressor 1, and be cooled to 20-42 ℃ (relevant) with envrionment temperature by main air water cooler 2, and then be compressed to 2500-4500kPa by two stage compressor 3, be cooled to 20-42 ℃ (relevant) by secondary air water cooler 4 at last with envrionment temperature;
The mix refrigerant that comes out from secondary air water cooler 4 still is gaseous state, enter in the first flow of precool heat exchanger device 5 and be cooled to-15 to-30 ℃, cooling off required cold is provided by vapour compression refrigeration system 9, preferably adopts fluorine Lyons vapour compression refrigeration system of environmental protection refrigerant R407C or R410A; Make second runner by precool heat exchanger device 5 from the low-temperature environment-friendly refrigeration agent R407C of refrigeration system 9 or R410A, in precool heat exchanger device 5, carry out heat exchange, mix refrigerant in the first flow of precool heat exchanger device 5 is carried out precooling, environmental protection refrigerant R407C or R410A self are heated evaporation simultaneously, turn back to the place, suction port of compressor in the vapour compression refrigeration system 9 then;
The 3rd runner that the mix refrigerant that comes out from precool heat exchanger device 5 enters cryogenic heat exchanger 6 is further cooled to-150 ℃ to-160 ℃ as hot-fluid, and through a J-T valve 7 (cryogen J-T valve) throttling expansion, temperature further reduces then; Mix refrigerant after the cooling returns second runner of cryogenic heat exchanger 6, provide cooled natural gas and precooling mix refrigerant (in the 3rd runner) required cold as cold fluid, make the Sweet natural gas of the first flow by cryogenic heat exchanger 6 cool to-150 ℃ to-160 ℃;
Raw natural gas is conveyed into the first flow of cryogenic heat exchanger 6 by natural-gas transfer pipeline 10, and the liquefaction that is cooled therein, and after 8 throttlings of the 2nd J-T valve, output obtains the LNG product.
The natural gas liquefaction device that present embodiment provides is suitable for the Sweet natural gas of pressure higher (absolute pressure is more than 600kPa) is liquefied.
Present embodiment provides a kind of natural gas liquefaction device, and it comprises chilldown system, the mix refrigerant recycle system, natural pressure compression system and natural-gas transfer pipeline, its concrete structure as shown in Figure 2:
Wherein, above-mentioned natural pressure compression system comprises one-level natural gas compressor 11 and one-level Sweet natural gas air-cooler 12, natural-gas transfer pipeline 10 is connected with the 2nd J-T valve 8 with the first flow of one-level natural gas compressor 11, one-level Sweet natural gas air-cooler 12, cryogenic heat exchanger 6 successively, and the structure of the above-mentioned chilldown system and the mix refrigerant recycle system is identical with embodiment 1 with annexation.
When the said apparatus that adopts present embodiment to provide carries out the liquefaction of Sweet natural gas, raw natural gas at first enters the natural pressure compression system and carries out single-stage compression and air cooling, to 500-800kPa, and be cooled to 20-42 ℃ (relevant) by one-level natural gas compressor 11 single-stage compression with envrionment temperature by one-level Sweet natural gas air-cooler 12; Be conveyed into the first flow of cryogenic heat exchanger 6 then by natural-gas transfer pipeline 10, and the liquefaction that is cooled therein (being cooled to-150 ℃ to-160 ℃), after 8 throttlings of the 2nd J-T valve, output obtains the LNG product;
The technology that is provided in all can reference example 1 for other processing steps and processing parameter.
The natural gas liquefaction device that present embodiment provides is suitable for the Sweet natural gas of pressure lower (absolute pressure is below 600kPa) is liquefied.
Present embodiment provides a kind of natural gas liquefaction device, and it comprises chilldown system, the mix refrigerant recycle system, natural pressure compression system and natural-gas transfer pipeline, its concrete structure as shown in Figure 3:
Wherein, above-mentioned natural pressure compression system is a secondary formula compression system, it comprises one-level natural gas compressor 11, one-level Sweet natural gas air-cooler 12, secondary natural gas compressor 13 and secondary natural gas compressor 14, natural-gas transfer pipeline 10 is connected with the 2nd J-T valve 8 with the first flow of one-level natural gas compressor 11, one-level Sweet natural gas air-cooler 12, secondary natural gas compressor 13, secondary natural gas compressor 14, cryogenic heat exchanger 6 successively, and the structure of the above-mentioned chilldown system and the mix refrigerant recycle system is identical with embodiment 1 and 2 with annexation.
When the said apparatus that adopts present embodiment to provide carries out the liquefaction of Sweet natural gas, raw natural gas enters the natural pressure compression system and carries out compression of secondary formula and air cooling, at first be compressed to 500-800kPa and be cooled to 20-42 ℃ (relevant), and then be compressed to 1500-2500kPa and be cooled to 20-42 ℃ (relevant) with envrionment temperature by secondary Sweet natural gas air-cooler 14 by secondary natural gas compressor 13 with envrionment temperature by one-level Sweet natural gas air-cooler 12 by one-level natural gas compressor 11;
Finish Sweet natural gas after compression in the natural pressure compression system and the air cooling is conveyed into cryogenic heat exchanger 6 by natural-gas transfer pipeline 10 first flow, and the liquefaction that is cooled therein (being cooled to-150 ℃ to-160 ℃), after 8 throttlings of the 2nd J-T valve, output obtains the LNG product;
The technology that is provided in all can reference example 1 and 2 for other processing steps and processing parameter.
Above embodiment only is used to the technical solution of the utility model is described and is unrestricted, although the utility model is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement the technical solution of the utility model, and not break away from the spirit and scope of technical solutions of the utility model.
Claims (8)
1. natural gas liquefaction device, it comprises chilldown system, the mix refrigerant recycle system and natural-gas transfer pipeline, it is characterized in that:
The described mix refrigerant recycle system comprises a stage compressor, main air water cooler, two stage compressor, secondary air water cooler, precool heat exchanger device, cryogenic heat exchanger, a J-T valve and the 2nd J-T valve, and, be provided with the first flow and second runner in the described precool heat exchanger device, be provided with first flow, second runner and the 3rd runner in the described cryogenic heat exchanger; Wherein, second runner of the 3rd runner of the first flow of a stage compressor, main air water cooler, two stage compressor, secondary air water cooler, precool heat exchanger device, cryogenic heat exchanger, a J-T valve, cryogenic heat exchanger connects successively and forms the loop;
Described chilldown system is fluorine Lyons chilldown system, and this fluorine Lyons chilldown system is connected with second runner of described precool heat exchanger device and forms the loop;
Described natural-gas transfer pipeline is connected with the first flow of described cryogenic heat exchanger, described the 2nd J-T valve successively.
2. natural gas liquefaction device as claimed in claim 1 is characterized in that, this natural gas liquefaction device comprises a natural pressure compression system, and this natural pressure compression system comprises one-level natural gas compressor and one-level Sweet natural gas air-cooler.
3. natural gas liquefaction device as claimed in claim 2, it is characterized in that described natural-gas transfer pipeline is connected with the first flow and described the 2nd J-T valve of the one-level natural gas compressor of described natural pressure compression system, one-level Sweet natural gas air-cooler, described cryogenic heat exchanger successively.
4. natural gas liquefaction device as claimed in claim 2 is characterized in that, described one-level natural gas compressor is piston-type natural gas compressor or screw natural gas compressor.
5. natural gas liquefaction device as claimed in claim 2 is characterized in that, described natural pressure compression system also comprises secondary natural gas compressor and secondary Sweet natural gas air-cooler.
6. natural gas liquefaction device as claimed in claim 5, it is characterized in that described natural-gas transfer pipeline is connected with the first flow and described the 2nd J-T valve of the one-level natural gas compressor of described natural pressure compression system, one-level Sweet natural gas air-cooler, secondary natural gas compressor, secondary Sweet natural gas air-cooler, described cryogenic heat exchanger successively.
7. natural gas liquefaction device as claimed in claim 5 is characterized in that, described secondary natural gas compressor is piston-type natural gas compressor or screw natural gas compressor.
8. natural gas liquefaction device as claimed in claim 1 is characterized in that, described fluorine Lyons chilldown system is a vapour compression refrigeration system.
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| CN2010206699765U CN201915073U (en) | 2010-12-20 | 2010-12-20 | Mixture refrigerant natural gas liquefaction device using Freon for precooling |
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| CN2010206699765U CN201915073U (en) | 2010-12-20 | 2010-12-20 | Mixture refrigerant natural gas liquefaction device using Freon for precooling |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104520660A (en) * | 2012-09-07 | 2015-04-15 | 吉宝岸外和海事技术中心私人有限公司 | System and method for natural gas liquefaction |
| CN110553467A (en) * | 2019-09-11 | 2019-12-10 | 张家港富瑞特种装备股份有限公司 | Natural gas propane precooling module |
| DE102020006396A1 (en) | 2020-10-17 | 2022-04-21 | Linde Gmbh | Process and plant for producing a liquified hydrocarbon product |
-
2010
- 2010-12-20 CN CN2010206699765U patent/CN201915073U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104520660A (en) * | 2012-09-07 | 2015-04-15 | 吉宝岸外和海事技术中心私人有限公司 | System and method for natural gas liquefaction |
| CN104520660B (en) * | 2012-09-07 | 2017-04-26 | 吉宝岸外和海事技术中心私人有限公司 | System and method for natural gas liquefaction |
| CN110553467A (en) * | 2019-09-11 | 2019-12-10 | 张家港富瑞特种装备股份有限公司 | Natural gas propane precooling module |
| CN110553467B (en) * | 2019-09-11 | 2023-10-20 | 张家港富瑞特种装备股份有限公司 | Natural gas propane precooling module |
| DE102020006396A1 (en) | 2020-10-17 | 2022-04-21 | Linde Gmbh | Process and plant for producing a liquified hydrocarbon product |
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