CN101900474A - Gas liquefying and circulating structure - Google Patents
Gas liquefying and circulating structure Download PDFInfo
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- CN101900474A CN101900474A CN2010102181164A CN201010218116A CN101900474A CN 101900474 A CN101900474 A CN 101900474A CN 2010102181164 A CN2010102181164 A CN 2010102181164A CN 201010218116 A CN201010218116 A CN 201010218116A CN 101900474 A CN101900474 A CN 101900474A
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- Prior art keywords
- heat exchanger
- gas
- sensible heat
- inlet
- valve control
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- 230000008929 regeneration Effects 0.000 claims abstract description 43
- 238000011069 regeneration method Methods 0.000 claims abstract description 43
- 238000005057 refrigeration Methods 0.000 claims description 75
- 239000002994 raw material Substances 0.000 claims description 43
- 239000003507 refrigerant Substances 0.000 claims description 20
- 239000000446 fuel Substances 0.000 claims description 16
- 238000010992 reflux Methods 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 7
- 238000010521 absorption reaction Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 160
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 42
- 239000003949 liquefied natural gas Substances 0.000 description 33
- 230000001172 regenerating effect Effects 0.000 description 25
- 239000003345 natural gas Substances 0.000 description 21
- 239000012535 impurity Substances 0.000 description 17
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 16
- 238000010926 purge Methods 0.000 description 14
- 239000003245 coal Substances 0.000 description 10
- 238000001816 cooling Methods 0.000 description 10
- 229910002092 carbon dioxide Inorganic materials 0.000 description 8
- 239000001569 carbon dioxide Substances 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 2
- 239000003463 adsorbent Substances 0.000 description 2
- 239000003034 coal gas Substances 0.000 description 2
- 238000002309 gasification Methods 0.000 description 2
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 2
- 238000002203 pretreatment Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 230000007420 reactivation Effects 0.000 description 1
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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
- F25J1/0032—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 the feed stream itself or separated fractions from it, i.e. "internal refrigeration"
- F25J1/004—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 the feed stream itself or separated fractions from it, i.e. "internal refrigeration" by flash gas recovery
-
- 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
- F25J1/0228—Coupling of the liquefaction unit to other units or processes, so-called integrated processes
- F25J1/0229—Integration with a unit for using hydrocarbons, e.g. consuming hydrocarbons as feed stock
- F25J1/023—Integration with a unit for using hydrocarbons, e.g. consuming hydrocarbons as feed stock for the combustion as fuels, i.e. integration with the fuel gas system
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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
- 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
- F25J1/0269—Arrangement of liquefaction units or equipments fulfilling the same process step, e.g. multiple "trains" concept
- F25J1/0271—Inter-connecting multiple cold equipments within or downstream of the cold box
- F25J1/0272—Multiple identical heat exchangers in parallel
-
- 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
- F25J2210/06—Splitting of the feed stream, e.g. for treating or cooling in different ways
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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)
- Combustion & Propulsion (AREA)
- Separation By Low-Temperature Treatments (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention relates to a gas liquefying and circulating structure which comprises a main refrigerating circuit, a first refrigerating circuit and a raw gas pipeline, wherein the main refrigerating circuit is a circuit formed by the connection of a compressor unit, a cooler, a main heat exchanger, a latent heat exchanger, a main throttling and refrigerating element and a pipeline; the first refrigerating circuit is a circuit formed by the connection of a compressor unit, a cooler, a main heat exchanger, an auxiliary throttling and refrigerating element, a first sensible heat exchanger and a pipeline; and the first raw gas pipeline is a circuit formed by the connection of the first sensible heat exchanger, the latent heat exchanger, an LNG storage tank and a pipeline. The gas liquefying and circulating structure is simple, has no absorption tower, regeneration tower or other complicated devices, enables the overall system to be more compact and greatly lowers the cost.
Description
Technical field
The present invention relates to a kind of gas liquefying and circulating structure.
Background technology
The liquefaction of natural gas belongs to chilling process, impurity under low-temperature condition in the natural gas causes corrosion and blocking pipeline to liquefaction device easily, therefore before liquefaction, must carry out preliminary treatment, slough components such as water vapour, carbon dioxide and hydrogen sulfide wherein natural gas.In general, in the natural gas after the processing, the concentration of water vapour is less than 0.1ppm, and concentration of carbon dioxide is less than 50ppm, and the content of hydrogen sulfide is less than 3.5mg/m
3Removing of water and carbon dioxide is of paramount importance link in the natural gas pre-treatment.Tradition removes the suction type that technology generally adopts physics or chemistry, and works in the mode of many covering devices alternate cycles, takes mode of heating to realize adsorbent reactivation.The general adsorbent life-span is in the several years scope, most imports.Therefore, the cost of investment of pretreating device and operating cost are all very high.The cost of preprocessing system has occupied sizable ratio of whole cost in the middle of the existing natural gas liquefaction plant.
The another one aspect, removing of above-mentioned impurity can realize that also tradition is called the low temperature cold wash in subcooled mode.Therefore, a kind of gas liquefying and circulating structure provided by the invention, utilize the part cold to realize that the sensible heat cooling of unstripped gas also can realize cold wash simultaneously, reduced the pre-treatment requirement of gas, only need carry out the most basic processing such as filtration, need not complex device such as absorption tower and regenerator unstrpped gas, reduced the cost of investment of gas liquefaction, and whole device is simply compact, can carry out whole skid, is convenient to the transportation of system; And do not need extra the regeneration source of the gas and the renewable sources of energy, reduced use cost, use convenient.
Summary of the invention
The object of the present invention is to provide a kind of gas liquefaction EGR.
Technical scheme of the present invention is as follows:
Gas liquefying and circulating structure provided by the invention, it comprises: compressor unit (CU), cooler (AC), main heat exchanger (HX1), latent heat exchanger (HX2), first sensible heat exchanger (CS1), LNG (liquefied natural gas) storage tank (FL), main throttling refrigeration element (V1), auxiliary throttling refrigeration element (V2), the first refrigeration by-pass valve control (V3), the first raw material by-pass valve control (V5) and first regeneration by-pass valve control (V6) and the pipeline;
Described compressor unit (CU) outlet connects cooler (AC) inlet, cooler (AC) outlet connects main heat exchanger (HX1) high pressure entry, and main heat exchanger (HX1) high-pressure outlet connects main throttling refrigeration element (V1) inlet and auxiliary throttling refrigeration element (V2) inlet respectively by a tee pipe fitting; Main throttling refrigeration element (V1) outlet connects latent heat exchanger (HX2) refrigerant inlet, latent heat exchanger (HX2) refrigerant outlet connects main heat exchanger (HX1) low-pressure inlet, and main heat exchanger (HX1) low tension outlet connects compressor unit (CU) and goes into interruption-forming master refrigerating circuit (CL);
Described auxiliary throttling refrigeration element (V2) outlet connects first refrigeration by-pass valve control (V3) inlet, first refrigeration by-pass valve control (V3) outlet connects first sensible heat exchanger (CS1) refrigerant inlet, and first sensible heat exchanger (CS1) refrigerant outlet connects compressor unit (CU) and goes into interruption-forming first refrigerating circuit (SL1);
Connect first sensible heat exchanger (CS1) unstripped gas inlet through the pretreated unstripped gas of simple filtration by pipeline, the outlet of first sensible heat exchanger (CS1) unstripped gas connects the first raw material by-pass valve control (V5) inlet and first regeneration by-pass valve control (V6) inlet respectively by a tee pipe fitting; The outlet of the first raw material by-pass valve control (V5) connects latent heat exchanger (HX2) unstripped gas inlet, the outlet of latent heat exchanger (HX2) unstripped gas connects LNG storage tank (FL) inlet to constitute the first unstripped gas pipeline (GL1), and described first regeneration by-pass valve control (V6) outlet is the gaseous fuel outlet.
Its mode of operation is: mix refrigerant enters cooler AC after being compressed by compressor CU, enter main heat exchanger HX1 then, be cooled to the high pressure low temperature cold-producing medium afterwards, proportionally main cold-producing medium enters latent heat exchanger HX2 through main throttling refrigeration element V1 provides the laggard main heat exchanger HX1 of going into of cold that cold progressively is provided, self rewarming then, after enter compressor; Another road cold-producing medium enters first sensible heat exchanger after entering assistant throttle component V2 throttling, and cooling unstripped gas and impurity such as carbon dioxide etc. in the unstripped gas solidified is adsorbed in the sensible heat exchanger.And, at first enter latent heat exchanger liquefaction through first sensible heat exchanger CS1 cooling and after further purifying for unstripped gas, enter storage tank FL then.In system works after a period of time, can adhere to impurity such as carbon dioxide among the first sensible heat exchanger CS1, close the first refrigeration by-pass valve control V3 and the first raw material by-pass valve control V5 this moment, open the first regenerating valve V6, the first sensible heat exchanger CS1 is rewarming regeneration under unstripped gas ground purges.Unstripped gas behind the purging can be used as gaseous fuel.
Gas liquefying and circulating structure provided by the invention also can comprise first gas return path (HL1);
Described first gas return path (HL1) is made up of LNG storage tank (FL), first backflow controlled value (V9), first sensible heat exchanger (CS1) and pipeline; Cryogenic gas in the described LNG storage tank (FL) connects first backflow controlled value (V9) inlet by pipeline, first backflow controlled value (V9) outlet connects first sensible heat exchanger (CS1) gas backstreaming inlet, and first sensible heat exchanger (CS1) gas backstreaming outlet is the reflux gas fuel outlet.
In refrigeration machine when work,, the low temperature feedstock gas steam among the LNG storage tank FL enters the first sensible heat exchanger CS1, and provides cold for the first sensible heat exchanger CS1; The unstripped gas that exports out from the gas backstreaming of the first sensible heat exchanger CS1 can be used as gaseous fuel.
Gas liquefying and circulating structure provided by the invention also can further comprise second refrigerating circuit (SL2) and the second unstripped gas pipeline (GL2);
Described second refrigerating circuit (SL2) is made up of compressor unit (CU), cooler (AC), main heat exchanger (HX1), auxiliary throttling refrigeration element (V2), the second refrigeration by-pass valve control (V4), second sensible heat exchanger (CS2) and pipeline; Described auxiliary throttling refrigeration element (V2) outlet connects second refrigeration by-pass valve control (V4) inlet, second refrigeration by-pass valve control (V4) outlet connects second sensible heat exchanger (CS2) refrigerant inlet, and second sensible heat exchanger (CS2) refrigerant outlet connects compressor unit (CU) and goes into interruption-forming second refrigerating circuit (SL2);
The described second unstripped gas pipeline (GL2) is made up of second sensible heat exchanger (CS2), the second raw material by-pass valve control (V7), the second regeneration by-pass valve control (V8), latent heat exchanger (HX2), LNG storage tank (FL) and pipeline; Its connected mode is: connect second sensible heat exchanger (CS2) unstripped gas inlet through the pretreated unstripped gas of simple filtration by pipeline, the outlet of second sensible heat exchanger (CS2) unstripped gas connects the second raw material by-pass valve control (V7) inlet and second regeneration by-pass valve control (V8) inlet respectively by a tee pipe fitting; The outlet of the second raw material by-pass valve control (V7) connects latent heat exchanger (HX2) unstripped gas inlet, and the outlet of latent heat exchanger (HX2) unstripped gas connects LNG storage tank (FL) inlet to form the second unstripped gas pipeline (GL2); Described second regeneration by-pass valve control (V8) outlet is the gaseous fuel outlet.
Refrigeration machine is when work, open the first refrigeration by-pass valve control V3 and the first raw material by-pass valve control V5, close the second refrigeration by-pass valve control V4, close the second raw material by-pass valve control V7, close the first regenerating valve V6, liquefy through the first unstripped gas pipeline GL1 through simple pretreated unstripped gas; In system works after a period of time, can adhere to impurity such as carbon dioxide among the first sensible heat exchanger CS1, close the first refrigeration by-pass valve control V3 and the first raw material by-pass valve control V5 this moment, and open the second refrigeration by-pass valve control V4, the second raw material by-pass valve control V7 and the first regenerating valve V6, unstripped gas is liquefied in the second unstripped gas pipeline GL2, and the first sensible heat exchanger CS1 is rewarming regeneration under unstripped gas ground purges; After a period of time, can stockpile a certain amount of impurity among the second sensible heat exchanger CS2, this moment, the first sensible heat exchanger CS1 regenerated, closed the second refrigerating circuit SL2, unstripped gas liquefaction is carried out in the first unstripped gas pipeline GL1, and the second sensible heat exchanger CS2 is rewarming regeneration under unstripped gas ground purges; Unstripped gas liquefaction can hocket in the first unstripped gas pipeline GL1 and the second unstripped gas pipeline GL2.
Gas liquefying and circulating structure provided by the invention also can comprise first gas return path (HL1) and second gas return path (HL2) again;
Described first gas return path (HL1) is made up of LNG storage tank (FL), first backflow controlled value (V9), first sensible heat exchanger (CS1) and pipeline; Its connected mode is: the cryogenic gas in the LNG storage tank (FL) connects first backflow controlled value (V9) inlet by pipeline, first backflow controlled value (V9) outlet connects first sensible heat exchanger (CS1) gas backstreaming inlet, and first sensible heat exchanger (CS1) gas backstreaming outlet is the reflux gas fuel outlet;
Described second gas return path (HL2) is made up of LNG storage tank (FL), second backflow controlled value (V10), second sensible heat exchanger (CS2) and pipeline; Its connected mode is: cryogenic gas connects second backflow controlled value (V10) inlet by pipeline in the LNG storage tank (FL), second backflow controlled value (V10) outlet connects second sensible heat exchanger (CS2) gas backstreaming inlet, and second sensible heat exchanger (CS2) gas backstreaming outlet is the reflux gas fuel outlet.
Its operating condition is:
Operating condition 1) first sensible heat exchanger CS1 liquefaction, the second sensible heat exchanger CS2 operating mode of regenerating:
After the second sensible heat exchanger CS2 worked a period of time, the second sensible heat exchanger CS2 can stockpile a certain amount of impurity, and this moment, the first sensible heat exchanger CS1 regenerated; Close the second refrigeration by-pass valve control V4, the second raw material by-pass valve control V7, the first regenerating valve V6 and the second backflow controlled value V10, open the first refrigeration by-pass valve control V3, the first raw material by-pass valve control V5, the second regenerating valve V8 and the first backflow controlled value V9, liquefy through the first unstripped gas pipeline GL1 through simple pretreated unstripped gas, the second sensible heat exchanger CS2 is rewarming regeneration under unstripped gas ground purges, low temperature feedstock gas steam among the LNG storage tank FL enters the first sensible heat exchanger CS1, and provides cold for the first sensible heat exchanger CS1;
Operating condition 2) second sensible heat exchanger CS2 liquefaction, the first sensible heat exchanger CS1 operating mode of regenerating:
After work a period of time, can adhere to impurity among the first sensible heat exchanger CS1 at the first sensible heat exchanger CS1, this moment, the second sensible heat exchanger CS2 regenerated; Close the first refrigeration by-pass valve control V3, the second regenerating valve V8, the first backflow controlled value V9 and the first raw material by-pass valve control V5, and open the second refrigeration by-pass valve control V4, the second backflow controlled value V10, the second raw material by-pass valve control V7 and the first regeneration by-pass valve control V6, unstripped gas is liquefied in the second unstripped gas pipeline GL2, and the first sensible heat exchanger CS1 is rewarming regeneration under unstripped gas ground purges; Low temperature feedstock gas steam among the LNG storage tank FL enters the second sensible heat exchanger CS2, and provides cold for the second sensible heat exchanger CS2; Above-mentioned operating condition 1) and operating condition 2) hocket.
Its operating condition also can be:
Operating condition 3) first sensible heat exchanger CS1 liquefaction, the second sensible heat exchanger CS2 operating mode of regenerating:
After second sensible heat exchanger CS2 work a period of time, the second sensible heat exchanger CS2 can stockpile a certain amount of impurity, and this moment, the first sensible heat exchanger CS1 regenerated, and is pre-chilled to temperature required in the first gas return path HL1 under the cooling of low temperature feedstock gas steam; Close the second refrigeration by-pass valve control V4, the second raw material by-pass valve control V7, the first regenerating valve V6 and the second backflow controlled value V10, open the first refrigeration by-pass valve control V3, the first raw material by-pass valve control V5 and the second regenerating valve V8, liquefy through the first unstripped gas pipeline GL1 through simple pretreated unstripped gas, the second sensible heat exchanger CS2 is rewarming regeneration under unstripped gas ground purges, low temperature feedstock gas steam among the LNG storage tank FL enters the first sensible heat exchanger CS1, and provides cold for the first sensible heat exchanger CS1; Open the second backflow controlled value V10 after the second sensible heat exchanger CS2 regeneration and make the second sensible heat exchanger CS2 precooling;
Operating condition 4) second sensible heat exchanger CS2 liquefaction, the first sensible heat exchanger CS1 operating mode of regenerating:
After first sensible heat exchanger CS1 work a period of time, can adhere to impurity among the first sensible heat exchanger CS1, this moment, the second sensible heat exchanger CS2 regenerated, and was pre-chilled to temperature required in the second gas return path HL2 under the cooling of low temperature feedstock gas steam; Close the first refrigeration by-pass valve control V3, the second regenerating valve V8, the first backflow controlled value V9 and the first raw material by-pass valve control V5, and open the second refrigeration by-pass valve control V4, the second raw material by-pass valve control V7 and the first regeneration by-pass valve control V6, unstripped gas is liquefied in the second unstripped gas pipeline GL2, and the first sensible heat exchanger CS1 is rewarming regeneration under unstripped gas ground purges; Low temperature feedstock gas steam among the LNG storage tank FL enters the second sensible heat exchanger CS2, and provides cold for the second sensible heat exchanger CS2; Open the first backflow controlled value V9 after the first sensible heat exchanger CS1 regeneration and make the first sensible heat exchanger CS1 precooling; Above-mentioned operating condition 3) and operating condition 4) hocket.
Gas liquefying and circulating structure provided by the invention, its refrigeration machine can turn round continuously and not shut down; Simple in structure, there are not devices such as complicated absorption tower and regenerator, make whole system compact more, greatly reduce system cost, improved the economic technology type of system; Can whole skid, be convenient to the transportation of system; Unstripped gas can be used as regeneration gas, and does not need extra regeneration source of the gas, has reduced cost, uses convenient.
Description of drawings
Accompanying drawing 1 is the structural representation of the present invention (embodiment 1) gas liquefying and circulating structure;
Accompanying drawing 2 is the structural representation of the present invention (embodiment 2) gas liquefying and circulating structure;
Accompanying drawing 3 is the structural representation of the present invention (embodiment 3) gas liquefying and circulating structure;
Accompanying drawing 4 is the structural representation of the present invention (embodiment 4 and 5) gas liquefying and circulating structure.
The specific embodiment
Further set forth the present invention below in conjunction with drawings and Examples.
Embodiment 1: use gas liquefying and circulating structure provided by the invention that natural gas is liquefied.
As shown in Figure 1, the gas liquefying and circulating structure of present embodiment 1 comprises compressor unit CU, cooler AC, main heat exchanger HX1, latent heat exchanger HX2, the first sensible heat exchanger CS1, LNG storage tank FL, main throttling refrigeration element V1, auxiliary throttling refrigeration element V2, the first refrigeration by-pass valve control V3, the first raw material by-pass valve control V5 and first regeneration by-pass valve control V6 and the pipeline; Its connected mode is: compressor unit CU outlet connects cooler AC inlet, cooler AC outlet connects main heat exchanger HX1 high pressure entry, and main heat exchanger HX1 high-pressure outlet connects main throttling refrigeration element V1 inlet respectively and assists throttling refrigeration element V2 inlet by a tee pipe fitting; Main throttling refrigeration element V1 outlet connects latent heat exchanger HX2 refrigerant inlet, and latent heat exchanger HX2 refrigerant outlet connects main heat exchanger HX1 low-pressure inlet, and main heat exchanger HX1 low tension outlet connects compressor unit CU inlet; Auxiliary throttling refrigeration element V2 outlet connects the first refrigeration by-pass valve control V3 inlet, and the first refrigeration by-pass valve control V3 outlet connects the refrigerant inlet of the first sensible heat exchanger CS1, and the refrigerant outlet of the first sensible heat exchanger CS1 connects compressor unit CU inlet; Connect first sensible heat exchanger CS1 unstripped gas inlet through the pretreated unstripped gas of simple filtration by pipeline, the outlet of the first sensible heat exchanger CS1 unstripped gas connects the first raw material by-pass valve control V5 inlet and the first regeneration by-pass valve control V6 inlet respectively by a tee pipe fitting; First raw material by-pass valve control V5 outlet connects latent heat exchanger HX2 unstripped gas inlet, and the outlet of latent heat exchanger HX2 unstripped gas connects LNG storage tank FL inlet; The first regeneration by-pass valve control V6 outlet is the gaseous fuel outlet; Above-mentioned main refrigerating circuit CL, the first refrigerating circuit SL1 and the first unstripped gas pipeline GL1 of being connected to form.Described main refrigerating circuit CL is made up of compressor unit CU, cooler AC, main heat exchanger HX1, latent heat exchanger HX2 and main throttling refrigeration element V1 and pipeline; The described first refrigerating circuit SL1 is made up of compressor unit CU, cooler AC, main heat exchanger HX1, auxiliary throttling refrigeration element V2, the first sensible heat exchanger CS1 and pipeline; The described first unstripped gas pipeline GL1 is made up of the first sensible heat exchanger CS1, latent heat exchanger HX2, LNG storage tank FL and pipeline.
Mix refrigerant enters cooler AC after being compressed by compressor CU, enter main heat exchanger HX1 then, be cooled to the high pressure low temperature cold-producing medium afterwards, proportionally main cold-producing medium enters latent heat exchanger HX2 through primary throttle valve V1 provides the laggard main heat exchanger HX1 of going into of cold that cold progressively is provided, self rewarming then, after enter compressor; Another road cold-producing medium enters first sensible heat exchanger after entering assistant throttle component V2 throttling, and cooling unstripped gas and impurity such as carbon dioxide etc. in the natural gas solidified is adsorbed in the sensible heat exchanger.And, at first enter latent heat exchanger liquefaction through first sensible heat exchanger CS1 cooling and after further purifying for natural gas, enter storage tank FL then.
Embodiment 2: use gas liquefying and circulating structure provided by the invention that natural gas is liquefied.
A kind of gas liquefying and circulating structure as shown in Figure 2 the loop and original paper of listing, also comprises the first gas return path HL1 in embodiment 1; The described first gas return path HL1 is made up of LNG storage tank FL, the first backflow controlled value V9, the first sensible heat exchanger CS1 and pipeline; Its connected mode is: cryogenic gas connects first backflow controlled value V9 inlet by pipeline among the LNG storage tank FL, first backflow controlled value V9 outlet connects first sensible heat exchanger CS1 gas backstreaming inlet, and the first sensible heat exchanger CS1 gas backstreaming exports as the reflux gas fuel outlet.During refrigeration machine work, natural gas at first enters latent heat exchanger liquefaction through first sensible heat exchanger CS1 cooling and after further purifying, and enters storage tank FL then; Liquefied natural gas among the LNG storage tank FL is discharged system, and cryogenic natural gas steam returns and enters the first sensible heat exchanger CS1, and provides cold for the first sensible heat exchanger CS1; The natural gas that exports out from the gas backstreaming of the first sensible heat exchanger CS1 can be used as gaseous fuel.
Embodiment 3: use a kind of gas liquefying and circulating structure provided by the invention that coal bed gas is liquefied.
Gas liquefying and circulating structure as shown in Figure 3 the loop and original paper of listing, also comprises the second refrigerating circuit SL2 and the second unstripped gas pipeline GL2 in embodiment 1.The described second refrigerating circuit SL2 is made up of compressor unit CU, cooler AC, main heat exchanger HX1, auxiliary throttling refrigeration element V2, the second refrigeration by-pass valve control V4, the second sensible heat exchanger CS2 and pipeline; Its connected mode is: auxiliary throttling refrigeration element V2 outlet connects the second refrigeration by-pass valve control V4 inlet, the second refrigeration by-pass valve control V4 outlet connects the second sensible heat exchanger CS2 refrigerant inlet, and the second sensible heat exchanger CS2 refrigerant outlet connects compressor unit CU inlet; Described second unstripped gas is made up of the second sensible heat exchanger CS2, the second raw material by-pass valve control V7, the second regeneration by-pass valve control V8, latent heat exchanger HX2, LNG storage tank FL and pipeline by pipeline GL2; Its connected mode is: connect second sensible heat exchanger CS2 unstripped gas inlet through the pretreated unstripped gas of simple filtration by pipeline, the outlet of the second sensible heat exchanger CS2 unstripped gas connects the second raw material by-pass valve control V7 inlet and the second regeneration by-pass valve control V8 inlet respectively by a tee pipe fitting; Second raw material by-pass valve control V7 outlet connects latent heat exchanger HX2 unstripped gas inlet, and the outlet of latent heat exchanger HX2 unstripped gas connects LNG storage tank FL inlet; The second regeneration by-pass valve control V8 outlet is the gaseous fuel outlet.
Refrigeration machine is when work, open the first refrigeration by-pass valve control V3 and the first raw material by-pass valve control V5, close the second refrigeration by-pass valve control V4, close the second raw material by-pass valve control V7, close the first regenerating valve V6, liquefy through the first unstripped gas pipeline GL1 through simple pretreated coal bed gas; In system works after a period of time, can adhere to impurity such as carbon dioxide among the first sensible heat exchanger CS1, close the first refrigeration by-pass valve control V3 and the first raw material by-pass valve control V5 this moment, and open the second refrigeration by-pass valve control V4, the second raw material by-pass valve control V7 and the first regenerating valve V6, coal bed gas is liquefied, first sensible heat exchanger CS1 rewarming regeneration under coal bed gas ground purges in the second unstripped gas pipeline GL2; After a period of time, can stockpile a certain amount of impurity among the second sensible heat exchanger CS2, this moment, the first sensible heat exchanger CS1 regenerated, closed the second refrigerating circuit SL2, coal gas gasification carries out in the first unstripped gas pipeline GL1, second sensible heat exchanger CS2 rewarming regeneration under coal bed gas ground purges; Coal gas gasification hockets at the first unstripped gas pipeline GL1 and the second unstripped gas pipeline GL2.
Embodiment 4: use a kind of gas liquefying and circulating structure provided by the invention that coal bed gas is liquefied.
Adopt gas liquefying and circulating structure shown in Figure 4, the loop and original paper of in embodiment 3, listing, also comprise the first gas return path HL1 and the second gas return path HL2.The described first gas return path HL1 is made up of LNG storage tank FL, the first backflow controlled value V9, the first sensible heat exchanger CS1 and pipeline; Its connected mode is: cryogenic gas connects first backflow controlled value V9 inlet by pipeline among the LNG storage tank FL, first backflow controlled value V9 outlet connects first sensible heat exchanger CS1 gas backstreaming inlet, and first sensible heat exchanger CS1 gas backstreaming outlet exports as reflux gas; The described second gas return path HL2 is made up of LNG storage tank FL, the second backflow controlled value V10, the second sensible heat exchanger CS2 and pipeline; Its connected mode is: cryogenic gas connects second backflow controlled value V10 inlet by pipeline among the LNG storage tank FL, second backflow controlled value V10 outlet connects second sensible heat exchanger CS2 gas backstreaming inlet, and second sensible heat exchanger CS2 gas backstreaming outlet exports as reflux gas.
Its operating condition is:
1) first sensible heat exchanger CS1 liquefaction, the second sensible heat exchanger CS2 operating mode of regenerating:
After the second sensible heat exchanger CS2 worked a period of time, the second sensible heat exchanger CS2 can stockpile a certain amount of impurity, and this moment, the first sensible heat exchanger CS1 regenerated; Close the second refrigeration by-pass valve control V4, the second raw material by-pass valve control V7, the first regenerating valve V6 and the second backflow controlled value V10, open the first refrigeration by-pass valve control V3, the first raw material by-pass valve control V5, the second regenerating valve V8 and the first backflow controlled value V9, liquefy through the first unstripped gas pipeline GL1 through simple pretreated coal bed gas, second sensible heat exchanger CS2 rewarming regeneration under coal bed gas ground purges, low temperature feedstock gas steam among the LNG storage tank FL enters the first sensible heat exchanger CS1, and provides cold for the first sensible heat exchanger CS1;
2) second sensible heat exchanger CS2 liquefaction, the first sensible heat exchanger CS1 operating mode of regenerating:
After work a period of time, can adhere to impurity among the first sensible heat exchanger CS1 at the first sensible heat exchanger CS1, this moment, the second sensible heat exchanger CS2 regenerated; Close the first refrigeration by-pass valve control V3, the second regenerating valve V8, the first backflow controlled value V9 and the first raw material by-pass valve control V5, and open the second refrigeration by-pass valve control V4, the second backflow controlled value V10, the second raw material by-pass valve control V7 and the first regeneration by-pass valve control V6, coal bed gas is liquefied, first sensible heat exchanger CS1 rewarming regeneration under coal bed gas ground purges in the second unstripped gas pipeline GL2; Low temperature feedstock gas steam among the LNG storage tank FL enters the second sensible heat exchanger CS2, and provides cold for the second sensible heat exchanger CS2; Operating mode 1) and operating mode 2) hocket.
Embodiment 5: use gas liquefying and circulating structure provided by the invention that natural gas is liquefied.
Adopt gas liquefying and circulating structure shown in Figure 4, its pipeline and connected mode are with embodiment 4.
Its operating condition is:
1) first sensible heat exchanger CS1 liquefaction, the second sensible heat exchanger CS2 operating mode of regenerating:
After second sensible heat exchanger CS2 work a period of time, the second sensible heat exchanger CS2 can stockpile a certain amount of impurity, and this moment, the first sensible heat exchanger CS1 regenerated, and is pre-chilled to temperature required in the first gas return path HL1 under the cooling of cryogenic natural gas steam; Close the second refrigeration by-pass valve control V4, the second raw material by-pass valve control V7, the first regenerating valve V6 and the second backflow controlled value V10, open the first refrigeration by-pass valve control V3, the first raw material by-pass valve control V5 and the second regenerating valve V8, liquefy through the first unstripped gas pipeline GL1 through simple pretreated natural gas, the second sensible heat exchanger CS2 is rewarming regeneration under natural gas ground purges, cryogenic natural gas steam among the LNG storage tank FL enters the first sensible heat exchanger CS1, and provides cold for the first sensible heat exchanger CS1; Open the second backflow controlled value V10 after the second sensible heat exchanger CS2 regeneration and make the second sensible heat exchanger CS2 precooling;
2) second sensible heat exchanger CS2 liquefaction, the first sensible heat exchanger CS1 operating mode of regenerating:
After first sensible heat exchanger CS1 work a period of time, can adhere to impurity among the first sensible heat exchanger CS1, this moment, the second sensible heat exchanger CS2 regenerated, and was pre-chilled to temperature required in the second gas return path HL2 under the cooling of cryogenic natural gas steam; Close the first refrigeration by-pass valve control V3, the second regenerating valve V8, the first backflow controlled value V9 and the first raw material by-pass valve control V5, and open the second refrigeration by-pass valve control V4, the second raw material by-pass valve control V7 and the first regeneration by-pass valve control V6, unstripped gas is liquefied in the second unstripped gas pipeline GL2, and the first sensible heat exchanger CS1 is rewarming regeneration under natural gas ground purges; Cryogenic natural gas steam among the LNG storage tank FL enters the second sensible heat exchanger CS2, and provides cold for the second sensible heat exchanger CS2; Open the first backflow controlled value V9 after the first sensible heat exchanger CS1 regeneration and make the first sensible heat exchanger CS1 precooling; Operating mode 1) and operating mode 2) hocket.
Claims (4)
1. a gas liquefying and circulating structure is characterized in that: comprise compressor unit (CU), cooler (AC), main heat exchanger (HX1), latent heat exchanger (HX2), first sensible heat exchanger (CS1), LNG storage tank (FL), main throttling refrigeration element (V1), auxiliary throttling refrigeration element (V2), the first refrigeration by-pass valve control (V3), the first raw material by-pass valve control (V5) and first regeneration by-pass valve control (V6) and the pipeline;
Described compressor unit (CU) outlet connects cooler (AC) inlet, cooler (AC) outlet connects main heat exchanger (HX1) high pressure entry, and main heat exchanger (HX1) high-pressure outlet connects main throttling refrigeration element (V1) inlet and auxiliary throttling refrigeration element (V2) inlet respectively by a tee pipe fitting; Main throttling refrigeration element (V1) outlet connects latent heat exchanger (HX2) refrigerant inlet, latent heat exchanger (HX2) refrigerant outlet connects main heat exchanger (HX1) low-pressure inlet, and main heat exchanger (HX1) low tension outlet connects compressor unit (CU) and goes into interruption-forming master refrigerating circuit (CL);
Described auxiliary throttling refrigeration element (V2) outlet connects first refrigeration by-pass valve control (V3) inlet, first refrigeration by-pass valve control (V3) outlet connects first sensible heat exchanger (CS1) refrigerant inlet, and first sensible heat exchanger (CS1) refrigerant outlet connects compressor unit (CU) and goes into interruption-forming first refrigerating circuit (SL1);
Connect first sensible heat exchanger (CS1) unstripped gas inlet through the pretreated unstripped gas of simple filtration by pipeline, the outlet of first sensible heat exchanger (CS1) unstripped gas connects the first raw material by-pass valve control (V5) inlet and first regeneration by-pass valve control (V6) inlet respectively by a tee pipe fitting; The outlet of the first raw material by-pass valve control (V5) connects latent heat exchanger (HX2) unstripped gas inlet, the outlet of latent heat exchanger (HX2) unstripped gas connects LNG storage tank (FL) inlet to constitute the first unstripped gas pipeline (GL1), and described first regeneration by-pass valve control (V6) outlet is the gaseous fuel outlet.
2. by the described gas liquefying and circulating structure of claim 1, it is characterized in that: also comprise first gas return path (HL1);
Described first gas return path (HL1) is made up of LNG storage tank (FL), first backflow controlled value (V9), first sensible heat exchanger (CS1) and pipeline; Cryogenic gas in the described LNG storage tank (FL) connects first backflow controlled value (V9) inlet by pipeline, first backflow controlled value (V9) outlet connects first sensible heat exchanger (CS1) gas backstreaming inlet, and first sensible heat exchanger (CS1) gas backstreaming outlet is the reflux gas fuel outlet.
3. by the described a kind of gas liquefying and circulating structure of claim 1, it is characterized in that: also comprise second refrigerating circuit (SL2) and the second unstripped gas pipeline (GL2);
Described second refrigerating circuit (SL2) is made up of compressor unit (CU), cooler (AC), main heat exchanger (HX1), auxiliary throttling refrigeration element (V2), the second refrigeration by-pass valve control (V4), second sensible heat exchanger (CS2) and pipeline; Described auxiliary throttling refrigeration element (V2) outlet connects second refrigeration by-pass valve control (V4) inlet, second refrigeration by-pass valve control (V4) outlet connects second sensible heat exchanger (CS2) refrigerant inlet, and second sensible heat exchanger (CS2) refrigerant outlet connects compressor unit (CU) and goes into interruption-forming second refrigerating circuit (SL2);
The described second unstripped gas pipeline (GL2) is made up of second sensible heat exchanger (CS2), the second raw material by-pass valve control (V7), the second regeneration by-pass valve control (V8), latent heat exchanger (HX2), LNG storage tank (FL) and pipeline; Its connected mode is: connect second sensible heat exchanger (CS2) unstripped gas inlet through the pretreated unstripped gas of simple filtration by pipeline, the outlet of second sensible heat exchanger (CS2) unstripped gas connects the second raw material by-pass valve control (V7) inlet and second regeneration by-pass valve control (V8) inlet respectively by a tee pipe fitting; The outlet of the second raw material by-pass valve control (V7) connects latent heat exchanger (HX2) unstripped gas inlet, and the outlet of latent heat exchanger (HX2) unstripped gas connects LNG storage tank (FL) inlet to form the second unstripped gas pipeline (GL2); Described second regeneration by-pass valve control (V8) outlet is the gaseous fuel outlet.
4. by the described a kind of gas liquefying and circulating structure of claim 3, its feature also is: also comprise first gas return path (HL1) and second gas return path (HL2);
Described first gas return path (HL1) is made up of LNG storage tank (FL), first backflow controlled value (V9), first sensible heat exchanger (CS1) and pipeline; Its connected mode is: the cryogenic gas in the LNG storage tank (FL) connects first backflow controlled value (V9) inlet by pipeline, first backflow controlled value (V9) outlet connects first sensible heat exchanger (CS1) gas backstreaming inlet, and first sensible heat exchanger (CS1) gas backstreaming outlet is the reflux gas fuel outlet;
Described second gas return path (HL2) is made up of LNG storage tank (FL), second backflow controlled value (V10), second sensible heat exchanger (CS2) and pipeline; Its connected mode is: cryogenic gas connects second backflow controlled value (V10) inlet by pipeline in the LNG storage tank (FL), second backflow controlled value (V10) outlet connects second sensible heat exchanger (CS2) gas backstreaming inlet, and second sensible heat exchanger (CS2) gas backstreaming outlet is the reflux gas fuel outlet.
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