CN104457137B - System and method for liquefying natural gas through multi-component refrigerant cycle refrigeration - Google Patents
System and method for liquefying natural gas through multi-component refrigerant cycle refrigeration Download PDFInfo
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- CN104457137B CN104457137B CN201410664674.1A CN201410664674A CN104457137B CN 104457137 B CN104457137 B CN 104457137B CN 201410664674 A CN201410664674 A CN 201410664674A CN 104457137 B CN104457137 B CN 104457137B
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Abstract
The invention provides a system and method for liquefying natural gas through multi-component refrigerant cycle refrigeration. The system comprises an oil-injected screw compressor, a lubricating oil separating device, a lubricating oil filtering device, a refrigerant cooling device, a refrigerant separating device and a heat exchange device, wherein the oil-injected screw compressor, the lubricating oil separating device, the lubricating oil filtering device, the refrigerant cooling device, the refrigerant separating device and the heat exchange device are connected in sequence through pipelines; the oil-injected screw compressor is used for supercharging multi-component refrigerants, the lubricating oil separating device and the lubricating oil filtering device are used for oil removal of the supercharged oil-bearing multi-component refrigerants, the refrigerant cooling device is used for cooling the multi-component refrigerants obtained after oil removal, the refrigerant separating device is used for extracting gas phase refrigerants and liquid phase refrigerants from the cooled multi-component refrigerants, and the heat exchange device is used for heat exchange of mixed liquid multi-component refrigerants and raw natural gas to liquefy raw natural gas. The system and method for liquefying natural gas have the advantages of saving the floor area, being stable in performance, convenient to operate and maintain, low in running cost and investment cost, and the like.
Description
Technical field
The application belongs to liquefaction Technology of Natural Gas field, is specifically related to a kind of system and method for multi-component refrigrant circularly cooling liquefied natural gas.
Background technology
The main component of natural gas or coal bed gas, shale gas is methane, methane in normal pressure situation (can be described as liquefied natural gas in temperature lower than becoming liquid methane when-161.5 DEG C, Liquefied Natural Gas, i.e. LNG), cannot be liquefied by supercharging at normal temperatures, need natural gas liquefaction process be adopted.The volume of liquefied natural gas is only 1/625 of raw-gas state, and density is more than 600 times of methane under standard state, 42.5% of water, and volume energy density is 75% of gasoline.Because of its clean burning quality, easy to use and be convenient to conveying and store, liquefied natural gas is ready-made is industry and the domestic fuel of high-quality.
Natural gas liquefaction cooling flow comprises one pack system and multicomponent mixed-refrigerant cycle refrigeration, and conventional is five kinds of component refrigerants circularly cooling liquefied natural gas at present.Application number be 201220052707.3 Chinese patent literature disclose a kind of twin-stage multi-component mixed refrigerant refrigeration natural gas liquefaction system, this system comprises precooling zone refrigeration system and liquefaction and super cooled sect refrigeration system; Described precooling zone refrigeration system comprises the pre-cold compressor, precooling compressor outlet cooler and the precooling compressor outlet separator that connect successively, the liquid and gas of described precooling compressor outlet separator all access precooling zone heat exchanger, and enter precooling compressor after going out precooling zone heat exchanger and circulate; Described liquefaction and super cooled sect refrigeration system comprise connect successively high pressure mixing cryogen knockout drum, liquefaction and super cooled sect heat exchanger, high pressure mixing refrigerant compressor and high pressure mixing refrigerant compressor outlet cooler, the liquid and gas of described high pressure mixing cryogen knockout drum all access liquefaction and super cooled sect heat exchanger, and go out to liquefy and enter high pressure mixing refrigerant compressor after super cooled sect heat exchanger to circulate.
Above-mentioned natural gas liquefaction system division system cold efficiency is high, is conducive to the production domesticization of key equipment and the maximization of liquefying plant, but said system floor space is large, and the requirement of operation and maintenance is higher, costly.
Summary of the invention
In view of this, the application provides a kind of system and method for multi-component refrigrant circularly cooling liquefied natural gas, and the system and method for the liquefied natural gas that the application provides saves floor space, stable performance, operation and maintenance is convenient, can reduce operating cost and investment, be beneficial to application.
The application provides a kind of system of multi-component refrigrant circularly cooling liquefied natural gas, comprising:
The fuel injection helical lobe compressor connected successively by pipeline, lubricating oil separation device, lubricating filtering device, refrigerant cooler, cold-producing medium separator and heat-exchanger rig;
Described fuel injection helical lobe compressor is used for multi-component refrigrant supercharging, described lubricating oil separation device and lubricating filtering device are used for the multi-component refrigrant oil removing to oil-containing after supercharging, described refrigerant cooler is for cooling the multi-component refrigrant after oil removing, and described cold-producing medium separator is used for cooled multi-component refrigrant to isolate vapor phase refrigerant and liquid phase refrigerant;
Described heat-exchanger rig is provided with Imported gas, gas outlet, cold-producing medium gas phase channel and cold-producing medium liquid channel; The import of described cold-producing medium gas phase channel is connected with the gaseous phase outlet of cold-producing medium separator, and the described outlet of cold-producing medium gas phase channel is connected with the import of fuel injection helical lobe compressor, and described cold-producing medium gas phase channel is provided with J-T valve; The import of described cold-producing medium liquid channel is connected with the liquid-phase outlet of cold-producing medium separator, and the outlet of described cold-producing medium liquid channel is positioned at the middle part of heat-exchanger rig and communicates with gas phase channel, and described cold-producing medium liquid channel is provided with J-T valve; Described heat-exchanger rig is used for the fluid multi-component cold-producing medium of mixing and raw natural gas heat exchange and raw natural gas is liquefied.
Preferably, described heat-exchanger rig is ice chest.
Preferably, the gas outlet end of described heat-exchanger rig is provided with J-T valve.
Preferably, described system also comprises heavy hydrocarbon separator, and the import of described heavy hydrocarbon separator is all connected with the middle part of heat-exchanger rig with outlet, for separating of the heavy hydrocarbon in removing raw natural gas.
The application also provides a kind of method of multi-component refrigrant circularly cooling liquefied natural gas, comprises the following steps:
A) multi-component refrigrant is carried out supercharging through fuel injection helical lobe compressor, obtain the multi-component refrigrant of oil-containing after supercharging;
B) by the multi-component refrigrant of oil-containing after described supercharging successively through lubricating oil separation device and lubricating filtering device, carry out oil removing, obtain the multi-component refrigrant after oil removing;
C) multi-component refrigrant after described oil removing is cooled through refrigerant cooler, obtain cooled multi-component refrigrant;
D) by described cooled multi-component refrigrant through cold-producing medium separator, obtain vapor phase refrigerant and liquid phase refrigerant;
E) described vapor phase refrigerant and liquid phase refrigerant are carried out step-down and cooling in heat-exchanger rig, obtain the fluid multi-component cold-producing medium mixed;
F) raw natural gas is carried out heat exchange with the described fluid multi-component cold-producing medium mixed in described heat-exchanger rig, obtain the gaseous-multicomponent cold-producing medium of liquefied natural gas and mixing; The gaseous-multicomponent cold-producing medium of described mixing is back to described fuel injection helical lobe compressor;
Described step a) ~ f) circulation carry out.
Preferably, described step a) in after supercharging the pressure of the multi-component refrigrant of oil-containing be 1.5MPa ~ 3.5MPa, temperature is 60 DEG C ~ 120 DEG C.
Preferably, described step b) in the lubricating oil content≤10mg/L of multi-component refrigrant after oil removing.
Preferably, described step c) in the temperature of cooled multi-component refrigrant be 20 DEG C ~ 45 DEG C.
Preferably, described step e) in the pressure of fluid multi-component cold-producing medium of mixing be 0.35MPa ~ 0.65MPa, temperature is-143 DEG C ~-165 DEG C.
Preferably, described step f) also comprise: in heat transfer process, by raw natural gas through heavy hydrocarbon separator, be separated the heavy hydrocarbon in removing raw natural gas.
Compared with prior art, the system of the multi-component refrigrant circularly cooling liquefied natural gas that the application provides comprises: the fuel injection helical lobe compressor connected successively by pipeline, lubricating oil separation device, lubricating filtering device, refrigerant cooler, cold-producing medium separator and heat-exchanger rig, wherein, described heat-exchanger rig is provided with Imported gas, gas outlet, cold-producing medium gas phase channel and cold-producing medium liquid channel; The import of described cold-producing medium gas phase channel is connected with the gaseous phase outlet of cold-producing medium separator, and the described outlet of cold-producing medium gas phase channel is connected with the import of fuel injection helical lobe compressor, and described cold-producing medium gas phase channel is provided with J-T valve; The import of described cold-producing medium liquid channel is connected with the liquid-phase outlet of cold-producing medium separator, and the outlet of described cold-producing medium liquid channel is positioned at the middle part of heat-exchanger rig and communicates with gas phase channel, and described cold-producing medium liquid channel is provided with J-T valve; In this application, described fuel injection helical lobe compressor is used for multi-component refrigrant supercharging, described lubricating oil separation device and lubricating filtering device are used for the multi-component refrigrant oil removing to oil-containing after supercharging, described refrigerant cooler is for cooling the multi-component refrigrant after oil removing, and described cold-producing medium separator is used for cooled multi-component refrigrant to isolate vapor phase refrigerant and liquid phase refrigerant; Described heat-exchanger rig is used for the fluid multi-component cold-producing medium of mixing and raw natural gas heat exchange and raw natural gas is liquefied.The application adopts fuel injection helical lobe compressor to carry out supercharging to multi-component refrigrant, and its rotating speed is high, adjustable output flow, and compact conformation, floor space are little, by skid-mounted type assembling, convenient transport; Do not have the consumable accessory such as air valve, piston ring, thus running reliable, life-span is grown and is easy to realize remote monitor; Intake and exhaust are even, without pressure pulse; High single-stage pressure ratio and low delivery temperature can be obtained; When operating point changes in a big way, machine efficiency change is little, does not have the surge phenomenon that centrifugal compressor occurs when little capacity; And simplify the operation control, maintenance difficulties, reduce production cost simultaneously.And, the application coordinates employing lubricating oil separation device and filter, and specific heat-exchanger rig etc., by raw natural gas without the need to independently precooling directly in heat-exchanger rig, carry out heat exchange with multi-component refrigrant and liquefy as liquified natural gas, thus achieving multi-component refrigrant circularly cooling liquefied natural gas.Therefore, the system and method for the liquefied natural gas that the application provides has saving floor space, stable performance, and operation and maintenance is convenient, operating cost and the advantage such as investment is lower.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
The structural representation of the system of the multi-component refrigrant circularly cooling liquefied natural gas that Fig. 1 provides for the embodiment of the present application 1;
The structural representation of the system of the multi-component refrigrant circularly cooling liquefied natural gas that Fig. 2 provides for the embodiment of the present application 2;
The structural representation of the system of the multi-component refrigrant circularly cooling liquefied natural gas that Fig. 3 provides for the embodiment of the present application 3.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
This application provides a kind of system of multi-component refrigrant circularly cooling liquefied natural gas, comprising:
The fuel injection helical lobe compressor connected successively by pipeline, lubricating oil separation device, lubricating filtering device, refrigerant cooler, cold-producing medium separator and heat-exchanger rig;
Described fuel injection helical lobe compressor is used for multi-component refrigrant supercharging, described lubricating oil separation device and lubricating filtering device are used for the multi-component refrigrant oil removing to oil-containing after supercharging, described refrigerant cooler is for cooling the multi-component refrigrant after oil removing, and described cold-producing medium separator is used for cooled multi-component refrigrant to isolate vapor phase refrigerant and liquid phase refrigerant;
Described heat-exchanger rig is provided with Imported gas, gas outlet, cold-producing medium gas phase channel and cold-producing medium liquid channel; The import of described cold-producing medium gas phase channel is connected with the gaseous phase outlet of cold-producing medium separator, and the described outlet of cold-producing medium gas phase channel is connected with the import of fuel injection helical lobe compressor, and described cold-producing medium gas phase channel is provided with J-T valve; The import of described cold-producing medium liquid channel is connected with the liquid-phase outlet of cold-producing medium separator, and the outlet of described cold-producing medium liquid channel is positioned at the middle part of heat-exchanger rig and communicates with gas phase channel, and described cold-producing medium liquid channel is provided with J-T valve; Described heat-exchanger rig is used for the fluid multi-component cold-producing medium of mixing and raw natural gas heat exchange and raw natural gas is liquefied.
The application provides the apparatus system adopting fuel injection helical lobe compressor circularly cooling liquefied natural gas for multi-component refrigrant, spool control valve mainly through fuel injection helical lobe compressor carries out load increase and decrease, adjustment mixed-refrigerant cycle refrigeration, to meet the application of liquefied natural gas (LNG) production.The system of the liquefied natural gas that the application provides saves floor space, stable performance, and operation and maintenance is convenient, can reduce operating cost and investment, be beneficial to application.
See Fig. 1, Fig. 2 and Fig. 3, the structural representation of the system of the multi-component refrigrant circularly cooling liquefied natural gas that Fig. 1 provides for the embodiment of the present application 1, the structural representation of the system of the multi-component refrigrant circularly cooling liquefied natural gas that Fig. 2 provides for the embodiment of the present application 2, the structural representation of the system of the multi-component refrigrant circularly cooling liquefied natural gas that Fig. 3 provides for the embodiment of the present application 3.
In Fig. 1, Fig. 2 and Fig. 3,01 is fuel injection helical lobe compressor, 02 is lubricating oil separator, 03 is lubricating oil filter, and 04 is refrigerant cooler, and 05 is refrigerant separator, 06 is ice chest, 07 is the J-T valve on liquid channel, and 08 is the J-T valve on gas phase channel, and 09 is the J-T valve of gas outlet end;
11 is raw natural gas, 12 is liquefied natural gas, 20 is the gaseous-multicomponent cold-producing medium of multi-component refrigrant or mixing, 21 multi-component refrigrants that are oil-containing after supercharging, 22 is the multi-component refrigrant after oil removing, 23 is cooled multi-component refrigrant, 24 is liquid phase refrigerant, 25 is the cold-producing medium without J-T valve on liquid channel in liquid channel, 26 is the cold-producing medium of J-T valve on liquid channel in liquid channel, 27 is vapor phase refrigerant, 28 is the cold-producing medium without J-T valve on gas phase channel in gas phase channel, 29 is the cold-producing medium of J-T valve on gas phase channel in gas phase channel.In addition, in Fig. 2,00 is heavy hydrocarbon separator, and 13 is the heavy hydrocarbon being separated removing from raw natural gas.
The system of the multi-component refrigrant circularly cooling liquefied natural gas that the application provides comprises fuel injection helical lobe compressor 01, and multi-component refrigrant 20, through fuel injection helical lobe compressor 01, forms the multi-component refrigrant 21 of oil-containing after supercharging.The application is not particularly limited described fuel injection helical lobe compressor, and it can adopt micro-oil lubrication.
The application adopts fuel injection helical lobe compressor to carry out supercharging to multi-component refrigrant, and its rotating speed is high, adjustable output flow, and compact conformation, floor space are little, by skid-mounted type assembling, convenient transport; Do not have the consumable accessory such as air valve, piston ring, thus running reliable, life-span is grown and is easy to realize remote monitor; Intake and exhaust are even, without pressure pulse; High single-stage pressure ratio and low delivery temperature can be obtained; When operating point changes in a big way, machine efficiency change is little, does not have the surge phenomenon that centrifugal compressor occurs when little capacity; And simplify the operation control, maintenance difficulties, reduce production cost simultaneously.
In addition, when the flow that raw natural gas enters heat-exchanger rig changes, the circularly cooling amount of the multi-component refrigrant of mixing is more than needed or not enough, the application is without the need to discharge or supplementary multi-component refrigrant, and carry out off-load or loading by the guiding valve controlling fuel injection helical lobe compressor, the internal circulating load of adjustable multi-component refrigrant, prevents the C in multi-component refrigrant
5component is solidified and is blocked in heat-exchanger rig, thus meets the product requirement exporting liquefied natural gas.
The system of described multi-component refrigrant circularly cooling liquefied natural gas comprises lubricating oil separation device, as lubricating oil separator 02.The application is not particularly limited described lubricating oil separation device, can adopt gs-oil separator, can separation lubrication oil.Described system comprises lubricating filtering device, as lubricating oil filter 03.The application is not particularly limited described lubricating filtering device, can cross and filter lubricating oil.
After supercharging, the multi-component refrigrant 21 of oil-containing is successively through lubricating oil separator 02 and lubricating oil filter 03, forms the multi-component refrigrant 22 after oil removing.The application by lubricating oil separation device and filter and fuel injection helical lobe compressor with the use of, and then realize natural gas liquefaction and produce.
The system of described multi-component refrigrant circularly cooling liquefied natural gas comprises refrigerant cooler, and as refrigerant cooler 04, the multi-component refrigrant 22 after oil removing, by refrigerant cooler 04, forms cooled multi-component refrigrant 23.Described refrigerant cooler is the device of the cooling multi-component refrigrant that this area is commonly used, and the application is not particularly limited.
The system of described multi-component refrigrant circularly cooling liquefied natural gas comprises cold-producing medium separator, as refrigerant separator 05, cooled multi-component refrigrant 23 be separated in refrigerant separator 05 give vent to anger, liquid two-phase, namely formed and mainly comprise C
3and C
5the liquid phase refrigerant 24 of component, and mainly comprise N
2, C
1and C
2the vapor phase refrigerant 27 of component.
The system of described multi-component refrigrant circularly cooling liquefied natural gas comprises heat-exchanger rig, preferably include ice chest 06, for making raw natural gas liquefy the fluid multi-component cold-producing medium of mixing and raw natural gas heat exchange.Described ice chest is device well known to those skilled in the art, mainly comprises heat exchanger.
In this application, described heat-exchanger rig is provided with cold-producing medium gas phase channel and cold-producing medium liquid channel, wherein, the import of described cold-producing medium liquid channel is connected with the liquid-phase outlet of cold-producing medium separator, the outlet of described cold-producing medium liquid channel is positioned at the middle part of heat-exchanger rig and communicates with gas phase channel, and described cold-producing medium liquid channel is provided with J-T valve.The embodiment of the present application is separated the liquid phase refrigerant 24 obtained and enters cold-producing medium liquid channel in ice chest 06, flow out at the middle part of ice chest 06, form the cold-producing medium 25 without J-T valve on liquid channel in liquid channel, J-T valve 07 throttling expansion on liquid channel, step-down cooling, form the cold-producing medium 26 of J-T valve on liquid channel in liquid channel, return the middle part of ice chest 06, for vapor phase refrigerant carries out precooling.
The import of described cold-producing medium gas phase channel is connected with the gaseous phase outlet of cold-producing medium separator, and the described outlet of cold-producing medium gas phase channel is connected with the import of fuel injection helical lobe compressor, and described cold-producing medium gas phase channel is provided with J-T valve.The embodiment of the present application is separated the vapor phase refrigerant 27 obtained and enters cold-producing medium gas phase channel in ice chest 06, through precooling, heat exchange to-140 DEG C ~-162 DEG C, become low temperature liquid mix refrigerant, flow out from the bottom of ice chest 06, namely the cold-producing medium 28 without J-T valve on gas phase channel in gas phase channel is formed, J-T valve 08 throttling expansion on gas phase channel, step-down cooling, form the cold-producing medium 29 of J-T valve on gas phase channel in gas phase channel, return in ice chest 06.
Described heat-exchanger rig is provided with Imported gas and gas outlet, in the embodiment of the present application, raw natural gas 11 enters ice chest 06 from Imported gas, heat exchange is carried out with the fluid multi-component cold-producing medium that mixes after step-down is lowered the temperature, make the temperature of raw natural gas (abbreviation unstripped gas) be down to-140 DEG C ~-162 DEG C and liquefy, gained liquefied natural gas 12 flows out from gas outlet.
In this application, the gas outlet end of described heat-exchanger rig is preferably provided with J-T valve, as the J-T valve 09 of gas outlet end, liquefied natural gas 12 is carried out step-down cooling.Liquefied natural gas after step-down cooling can be delivered to storage; The heat of the fluid multi-component refrigerant suction raw natural gas, gaseous refrigerant and the liquid refrigerant that simultaneously mix, temperature rises to normal temperature, becomes the gaseous-multicomponent cold-producing medium 20 of mixing; The gaseous-multicomponent cold-producing medium 20 of mixing flows out ice chest 06 by pipeline, returns fuel injection helical lobe compressor 01, can carry out the circulation of next cycle.
If containing heavy hydrocarbon in raw natural gas, the application can increase heavy hydrocarbon separator.Namely the system of described multi-component refrigrant circularly cooling liquefied natural gas preferably also comprises heavy hydrocarbon separator, as heavy hydrocarbon separator 00.The import of described heavy hydrocarbon separator is all connected with the middle part of heat-exchanger rig with outlet, and described heat-exchanger rig is provided with heavy hydrocarbon separator spare interface, can be used for being separated the heavy hydrocarbon 13 in removing raw natural gas.Described heavy hydrocarbon separator is the heavy hydrocarbon separator for separating of heavy hydrocarbon well known to those skilled in the art, and the application is not particularly limited.The application also can not increase heavy hydrocarbon separator, processes as shown in Figure 3.
In this application, above device is all connected by pipeline; Described J-T valve is Joule-Thomson throttle expansion valve, is the valve that this area is conventional.The system of the multi-component refrigrant circularly cooling liquefied natural gas that the application provides mainly comprises natural gas liquefaction part and refrigerant circulation part, refrigerant circulation part mainly contains fuel injection helical lobe compressor, lubricating oil separation device, lubricating filtering device, refrigerant cooler, cold-producing medium separator and heat-exchanger rig etc., and these devices form a closed-loop refrigeration agent cyclic part by pipeline type of attachment; And heat-exchanger rig connects to form natural gas liquefaction part through natural gas inlet and outlet piping etc.
In this application, raw natural gas directly enters heat-exchanger rig without the need to independently precooling, heat exchange is carried out with the multi-component refrigrant in described heat-exchanger rig, described raw natural gas is cooled to-140 DEG C ~-161 DEG C, liquefaction is liquified natural gas (liquefied natural gas, LNG), can go to store by Cemented filling again after the step-down of natural gas J-T valve, and multi-component refrigrant is successively through fuel injection helical lobe compressor supercharging, lubricating oil separation device is separated, lubricating filtering device filters, refrigerant cooler cooling is separated with cold-producing medium separator, the gas obtained, liquid two phase refrigerant enters in described heat-exchanger rig respectively, lower the temperature through the step-down of cold-producing medium J-T valve, return in described heat-exchanger rig, make it to liquefy with raw natural gas heat exchange, while providing cold for natural gas liquefaction, mix refrigerant self is also made to be vaporizated into the mix refrigerant of gaseous state, the mix refrigerant of described gaseous state then returns fuel injection helical lobe compressor and again circulates.
The application adopts fuel injection helical lobe compressor, lubricating oil separation device and filter, and specific heat-exchanger rig etc., by raw natural gas without the need to independently precooling directly in heat-exchanger rig, carry out heat exchange with multi-component refrigrant and liquefy as liquified natural gas, thus achieve the production process of multi-component refrigrant circularly cooling liquefied natural gas, there is saving floor space, stable performance, operation and maintenance is convenient, operating cost and the advantage such as investment is lower.
Accordingly, present invention also provides a kind of method of multi-component refrigrant circularly cooling liquefied natural gas, comprise the following steps:
A) multi-component refrigrant is carried out supercharging through fuel injection helical lobe compressor, obtain the multi-component refrigrant of oil-containing after supercharging;
B) by the multi-component refrigrant of oil-containing after described supercharging successively through lubricating oil separation device and lubricating filtering device, carry out oil removing, obtain the multi-component refrigrant after oil removing;
C) multi-component refrigrant after described oil removing is cooled through refrigerant cooler, obtain cooled multi-component refrigrant;
D) by described cooled multi-component refrigrant through cold-producing medium separator, obtain vapor phase refrigerant and liquid phase refrigerant;
E) described vapor phase refrigerant and liquid phase refrigerant are carried out step-down and cooling in heat-exchanger rig, obtain the fluid multi-component cold-producing medium mixed;
F) raw natural gas is carried out heat exchange with the described fluid multi-component cold-producing medium mixed in described heat-exchanger rig, obtain the gaseous-multicomponent cold-producing medium of liquefied natural gas and mixing; The gaseous-multicomponent cold-producing medium of described mixing is back to described fuel injection helical lobe compressor;
Described step a) ~ f) circulation carry out.
The method that the application provides is applied to multi-component refrigrant and adopts the equipment circularly cooling liquefied natural gas such as fuel injection helical lobe compressor, saves floor space, stable performance, and operation and maintenance is convenient, can reduce operating cost and investment, be beneficial to application.
Multi-component refrigrant is carried out supercharging through fuel injection helical lobe compressor by the embodiment of the present application, obtains the multi-component refrigrant of oil-containing after supercharging.
In this application, described multi-component refrigrant is mix refrigerant, and the application is not particularly limited, and selects the mix refrigerant that this area is conventional, can by N
2and C
1to C
5the various ingredients such as hydrocarbon composition; Described multi-component refrigrant is preferably five component refrigerants, as being made up of nitrogen, methane, ethene, propane and isopentane; In an embodiment of the application, described five component refrigerants are made up of 10wt% nitrogen, 23wt% methane, 35wt% ethene, 15wt% propane and 17wt% isopentane.
The application adopts fuel injection helical lobe compressor to carry out supercharging to multi-component refrigrant, and its rotating speed is high, adjustable output flow, and compact conformation, floor space are little, by skid-mounted type assembling, convenient transport; Do not have the consumable accessory such as air valve, piston ring, thus running reliable, life-span is grown and is easy to realize remote monitor; Intake and exhaust are even, without pressure pulse; High single-stage pressure ratio and low delivery temperature can be obtained; When operating point changes in a big way, machine efficiency change is little, does not have the surge phenomenon that centrifugal compressor occurs when little capacity; And simplify the operation control, maintenance difficulties, reduce production cost simultaneously.
The application is not particularly limited the structure of described fuel injection helical lobe compressor and the consumption etc. of multi-component refrigrant, as fuel injection helical lobe compressor can adopt micro-oil lubrication.In this application, after described supercharging, the multi-component refrigrant of oil-containing is HTHP oil-containing mix refrigerant gas, and its pressure is preferably 1.5MPa ~ 3.5MPa, is more preferably 2MPa ~ 3MPa; Temperature is preferably 60 DEG C ~ 120 DEG C, is more preferably 80 DEG C ~ 110 DEG C; The application was also not particularly limited the supercharging time used.
After obtaining the multi-component refrigrant of oil-containing after supercharging, it is separated through lubricating oil separation device by the embodiment of the present application successively, filter through lubricating filtering device, to remove the lubricating oil in gas, obtains the multi-component refrigrant after oil removing.
Described lubricating oil separation device and filter, with described content is consistent above, do not repeat them here.In this application, multi-component refrigrant after described oil removing is the high-temperature high-pressure refrigerant gas after oil removing, its lubricating oil content preferably≤10mg/L,, after effectively preventing the lubricating oil in compressor from entering heat-exchanger rig, there is the situation of heat exchange power drop and blocking heat exchanger channels in more preferably≤9mg/L.
After obtaining the multi-component refrigrant after oil removing, the embodiment of the present application is passed through refrigerant cooler, and temperature is cooled, and obtains cooled multi-component refrigrant.Described refrigerant cooler, with described content is consistent above, does not repeat them here.In this application, the temperature of described cooled multi-component refrigrant is preferably 20 DEG C ~ 45 DEG C, is more preferably 30 DEG C ~ 40 DEG C; The application was not particularly limited the cooling time used.
After obtaining cooled multi-component refrigrant, the embodiment of the present application by it through cold-producing medium separator, in described cold-producing medium separator be separated give vent to anger, liquid two-phase, obtain vapor phase refrigerant and liquid phase refrigerant.Described cold-producing medium separator, with described content is consistent above, does not repeat them here.In an embodiment of the application, described vapor phase refrigerant mainly comprises N
2, C
1and C
2component, described liquid phase refrigerant mainly comprises C
3and C
5component.
In the embodiment of the present application, enter cold-producing medium gas phase channel in heat-exchanger rig and liquid channel respectively through supercharging, oil removing, the cooling two-phase mixtures refrigerated medium cryogen after being separated successively, carry out step-down and cooling, obtain the fluid multi-component cold-producing medium mixed.
Described heat-exchanger rig, with described content is consistent above, does not repeat them here.In an embodiment of the application, the liquid phase refrigerant that separation obtains enters the cold-producing medium liquid channel in ice chest, flow out at the middle part of ice chest, form the cold-producing medium without J-T valve on liquid channel in liquid channel, the J-T valve throttling expansion on liquid channel, being depressurized to pressure is 0.3MPa ~ 0.6MPa, being cooled to temperature is-40 DEG C ~-55 DEG C, form the cold-producing medium of J-T valve on liquid channel in liquid channel, return the middle part of ice chest, for vapor phase refrigerant carries out precooling;
And the vapor phase refrigerant that separation obtains enters the cold-producing medium gas phase channel in ice chest, through precooling, heat exchange to-140 DEG C ~-162 DEG C, become low temperature liquid mix refrigerant, flow out from the bottom of ice chest, namely the cold-producing medium without J-T valve on gas phase channel in gas phase channel is formed, J-T valve throttling expansion on gas phase channel, step-down cooling, form the cold-producing medium of J-T valve on gas phase channel in gas phase channel, return in ice chest; The pressure of the fluid multi-component cold-producing medium of the application's gained mixing is preferably 0.35MPa ~ 0.65MPa, is more preferably 0.4MPa ~ 0.6MPa; Temperature is preferably-143 DEG C ~-165 DEG C, is more preferably-148 DEG C ~-160 DEG C.
In described heat-exchanger rig, the fluid multi-component cold-producing medium that the embodiment of the present application mixes after raw natural gas and step-down being lowered the temperature carries out heat exchange, unstripped gas temperature is made to be down to-140 DEG C ~-162 DEG C and to liquefy, obtain liquefied natural gas, it can be passed through after natural gas J-T valve carries out step-down, cooling and is delivered to storage;
Simultaneously, the heat of the fluid multi-component refrigerant suction raw natural gas mixed, gaseous state mix refrigerant and liquid mixed refrigerant, temperature rises to normal temperature and becomes the gaseous-multicomponent cold-producing medium of mixing, it flows out heat-exchanger rig by pipeline, be back to fuel injection helical lobe compressor, carry out the circulation of next cycle.
In this application, described raw natural gas can contain heavy hydrocarbon, also can not contain heavy hydrocarbon.In heat transfer process, the application preferably by raw natural gas through heavy hydrocarbon separator, be separated removing raw natural gas in heavy hydrocarbon.Described heavy hydrocarbon separator, with described content is consistent above, is not repeating at this.The difference that the gas flow of described raw natural gas requires according to user and different can be 5 × 10
4nm
3/ d ~ 15 × 10
4nm
3/ d.
The application removes wet goods through fuel injection helical lobe compressor supercharging, lubricating oil separation device and filter, by raw natural gas without the need to independently precooling directly in heat-exchanger rig, carry out heat exchange with multi-component refrigrant and liquefy as liquified natural gas, thus achieving multi-component refrigrant circularly cooling liquefied natural gas.Owing to adopting fuel injection helical lobe compressor, lubricating oil separation device and filter and heat-exchanger rig etc., the method for the liquefied natural gas that the application provides has saving floor space, stable performance, and operation and maintenance is convenient, operating cost and the advantage such as investment is lower.
In order to further illustrate the application, describing particularly below in conjunction with the system and method for embodiment to a kind of multi-component refrigrant circularly cooling liquefied natural gas that the application provides, but they can not be interpreted as the restriction to the application's protection domain.
Embodiment 1
Adopt the system of multi-component refrigrant circularly cooling liquefied natural gas as shown in Figure 1, multi-component refrigrant is made up of 10wt% nitrogen, 23wt% methane, 35wt% ethene, 15wt% propane and 17wt% isopentane, raw natural gas is not containing heavy hydrocarbon, and treating capacity is 5 × 10
4nm
3/ d.
Multi-component refrigrant is carried out supercharging through fuel injection helical lobe compressor, and obtain the multi-component refrigrant of oil-containing after supercharging, its pressure reaches 3.2MPa, and temperature is 115 DEG C; Wherein, fuel injection helical lobe compressor adopts micro-oil lubrication, and the oil mass entering compressor is 1.7L/min, and the inlet pressure of compressor is 0.2MPa, and outlet pressure is 3.2MPa, and inlet temperature is 10 DEG C ~ 45 DEG C, and outlet temperature is 115 DEG C; The circular flow of multi-component refrigrant is 5200Nm
3/ h;
By the multi-component refrigrant of oil-containing after described supercharging successively through gs-oil separator and lubricating oil filter, carry out oil removing, obtain the multi-component refrigrant after oil removing, its lubricating oil content≤10mg/L;
Cooled through refrigerant cooler by multi-component refrigrant after described oil removing, temperature is cooled to 30 DEG C, obtains cooled multi-component refrigrant;
By described cooled multi-component refrigrant through refrigerant separator, mainly comprised N
2, C
1and C
2the vapor phase refrigerant of component and mainly comprise C
3and C
5the liquid phase refrigerant of component;
The liquid phase refrigerant that separation obtains enters the cold-producing medium liquid channel in ice chest, flow out at the middle part of ice chest, form the cold-producing medium without J-T valve on liquid channel in liquid channel, J-T valve throttling expansion on liquid channel, being depressurized to pressure is 0.45MPa, is cooled to temperature and is-50 DEG C, forms the cold-producing medium of J-T valve on liquid channel in liquid channel, return the middle part of ice chest, for vapor phase refrigerant carries out precooling;
And the vapor phase refrigerant that separation obtains enters the cold-producing medium gas phase channel in ice chest, through precooling, heat exchange to-160 DEG C, become low temperature liquid mix refrigerant, flow out from the bottom of ice chest, namely the cold-producing medium without J-T valve on gas phase channel in gas phase channel is formed, J-T valve throttling expansion on gas phase channel, step-down cooling, form the cold-producing medium of J-T valve on gas phase channel in gas phase channel, return in ice chest; The pressure of the fluid multi-component cold-producing medium of gained mixing is 0.5MPa, and temperature is-163 DEG C;
Raw natural gas is carried out heat exchange with the described fluid multi-component cold-producing medium mixed in described ice chest, makes unstripped gas temperature be down to-160 DEG C, obtain liquefied natural gas, after natural gas J-T valve, be delivered to storage; Obtain the gaseous-multicomponent cold-producing medium mixed, it is back to described fuel injection helical lobe compressor, carries out the circulation of next cycle simultaneously.
Embodiment 2
Adopt the system of multi-component refrigrant circularly cooling liquefied natural gas as shown in Figure 2, multi-component refrigrant is made up of 10wt% nitrogen, 25wt% methane, 37wt% ethene, 13wt% propane and 15wt% isopentane, and raw natural gas contains a small amount of heavy hydrocarbon (C
6+wt%:0.02 ~ 0.09), and treating capacity is 5 × 10
4nm
3/ d.
Multi-component refrigrant is carried out supercharging through fuel injection helical lobe compressor, and obtain the multi-component refrigrant of oil-containing after supercharging, its pressure reaches 3.5MPa, and temperature is 120 DEG C; Wherein, fuel injection helical lobe compressor adopts micro-oil lubrication, and the oil mass entering compressor is 1.7L/min, and the inlet pressure of compressor is 0.2MPa, and outlet pressure is 3.5MPa, and inlet temperature is 10 DEG C ~ 45 DEG C, and outlet temperature is 120 DEG C; The circular flow of multi-component refrigrant is 5200Nm
3/ h;
By the multi-component refrigrant of oil-containing after described supercharging successively through gs-oil separator and lubricating oil filter, carry out oil removing, obtain the multi-component refrigrant after oil removing, its lubricating oil content≤10mg/L;
Cooled through refrigerant cooler by multi-component refrigrant after described oil removing, temperature is cooled to 40 DEG C, obtains cooled multi-component refrigrant;
By described cooled multi-component refrigrant through refrigerant separator, mainly comprised N
2, C
1and C
2the vapor phase refrigerant of component and mainly comprise C
3and C
5the liquid phase refrigerant of component;
The liquid phase refrigerant that separation obtains enters the cold-producing medium liquid channel in ice chest, flow out at the middle part of ice chest, form the cold-producing medium without J-T valve on liquid channel in liquid channel, J-T valve throttling expansion on liquid channel, being depressurized to pressure is 0.45MPa, is cooled to temperature and is-40 DEG C, forms the cold-producing medium of J-T valve on liquid channel in liquid channel, return the middle part of ice chest, for vapor phase refrigerant carries out precooling;
And the vapor phase refrigerant that separation obtains enters the cold-producing medium gas phase channel in ice chest, through precooling, heat exchange to-160 DEG C, become low temperature liquid mix refrigerant, flow out from the bottom of ice chest, namely the cold-producing medium without J-T valve on gas phase channel in gas phase channel is formed, J-T valve throttling expansion on gas phase channel, step-down cooling, form the cold-producing medium of J-T valve on gas phase channel in gas phase channel, return in ice chest; The pressure of the fluid multi-component cold-producing medium of gained mixing is 0.5MPa, and temperature is-163 DEG C;
Raw natural gas is carried out heat exchange with the described fluid multi-component cold-producing medium mixed in described ice chest, flow out in the middle part of ice chest, the heavy hydrocarbon in raw natural gas is isolated by heavy hydrocarbon separator, enter again in the middle part of ice chest, unstripped gas temperature is made to be down to-160 DEG C through ice chest heat exchange, obtain liquefied natural gas, after natural gas J-T valve, be delivered to storage; Obtain the gaseous-multicomponent cold-producing medium mixed, it is back to described fuel injection helical lobe compressor, carries out the circulation of next cycle simultaneously.
Embodiment 3
Adopt the system of multi-component refrigrant circularly cooling liquefied natural gas as shown in Figure 3, multi-component refrigrant is made up of 10wt% nitrogen, 23wt% methane, 35wt% ethene, 15wt% propane and 17wt% isopentane, raw natural gas contains non-quantitative heavy hydrocarbon, and treating capacity is 5 × 10
4nm
3/ d.
Multi-component refrigrant is carried out supercharging through fuel injection helical lobe compressor, and obtain the multi-component refrigrant of oil-containing after supercharging, its pressure reaches 3.2MPa, and temperature is 115 DEG C; Wherein, fuel injection helical lobe compressor adopts micro-oil lubrication, and the oil mass entering compressor is 1.7L/min, and the inlet pressure of compressor is 0.2MPa, and outlet pressure is 3.2MPa, and inlet temperature is 10 DEG C ~ 45 DEG C, and outlet temperature is 115 DEG C; The circular flow of multi-component refrigrant is 5200Nm
3/ h;
By the multi-component refrigrant of oil-containing after described supercharging successively through gs-oil separator and lubricating oil filter, carry out oil removing, obtain the multi-component refrigrant after oil removing, its lubricating oil content≤10mg/L;
Cooled through refrigerant cooler by multi-component refrigrant after described oil removing, temperature is cooled to 40 DEG C, obtains cooled multi-component refrigrant;
By described cooled multi-component refrigrant through refrigerant separator, mainly comprised N
2, C
1and C
2the vapor phase refrigerant of component and mainly comprise C
3and C
5the liquid phase refrigerant of component;
The liquid phase refrigerant that separation obtains enters the cold-producing medium liquid channel in ice chest, flow out at the middle part of ice chest, form the cold-producing medium without J-T valve on liquid channel in liquid channel, J-T valve throttling expansion on liquid channel, being depressurized to pressure is 0.45MPa, is cooled to temperature and is-50 DEG C, forms the cold-producing medium of J-T valve on liquid channel in liquid channel, return the middle part of ice chest, for vapor phase refrigerant carries out precooling;
And the vapor phase refrigerant that separation obtains enters the cold-producing medium gas phase channel in ice chest, through precooling, heat exchange to-160 DEG C, become low temperature liquid mix refrigerant, flow out from the bottom of ice chest, namely the cold-producing medium without J-T valve on gas phase channel in gas phase channel is formed, J-T valve throttling expansion on gas phase channel, step-down cooling, form the cold-producing medium of J-T valve on gas phase channel in gas phase channel, return in ice chest; The pressure of the fluid multi-component cold-producing medium of gained mixing is 0.5MPa, and temperature is-163 DEG C;
Raw natural gas is carried out heat exchange with the described fluid multi-component cold-producing medium mixed in described ice chest, makes unstripped gas temperature be down to-160 DEG C, obtain liquefied natural gas, after natural gas J-T valve, be delivered to storage; Obtain the gaseous-multicomponent cold-producing medium mixed, it is back to described fuel injection helical lobe compressor, carries out the circulation of next cycle simultaneously.
As seen from the above embodiment, the application adopts fuel injection helical lobe compressor to carry out supercharging to multi-component refrigrant, and its rotating speed is high, adjustable output flow, and compact conformation, floor space are little, by skid-mounted type assembling, convenient transport; Do not have the consumable accessory such as air valve, piston ring, thus running reliable, life-span is grown and is easy to realize remote monitor; Intake and exhaust are even, without pressure pulse; High single-stage pressure ratio and low delivery temperature can be obtained; When operating point changes in a big way, machine efficiency change is little, does not have the surge phenomenon that centrifugal compressor occurs when little capacity; And simplify the operation control, maintenance difficulties, reduce production cost simultaneously.And, the application coordinates employing lubricating oil separation device and filter, and specific heat-exchanger rig etc., by raw natural gas without the need to independently precooling directly in heat-exchanger rig, carry out heat exchange with multi-component refrigrant and liquefy as liquified natural gas, thus achieving multi-component refrigrant circularly cooling liquefied natural gas.Therefore, the system and method for the liquefied natural gas that the application provides has saving floor space, stable performance, and operation and maintenance is convenient, operating cost and the advantage such as investment is lower.
Claims (10)
1. a system for multi-component refrigrant circularly cooling liquefied natural gas, comprising:
The fuel injection helical lobe compressor connected successively by pipeline, lubricating oil separation device, lubricating filtering device, refrigerant cooler, cold-producing medium separator and heat-exchanger rig;
Described fuel injection helical lobe compressor is used for multi-component refrigrant supercharging, described lubricating oil separation device and lubricating filtering device are used for the multi-component refrigrant oil removing to oil-containing after supercharging, described refrigerant cooler is for cooling the multi-component refrigrant after oil removing, and described cold-producing medium separator is used for cooled multi-component refrigrant to isolate vapor phase refrigerant and liquid phase refrigerant;
Described heat-exchanger rig is provided with Imported gas, gas outlet, cold-producing medium gas phase channel and cold-producing medium liquid channel; The import of described cold-producing medium gas phase channel is connected with the gaseous phase outlet of cold-producing medium separator, and the described outlet of cold-producing medium gas phase channel is connected with the import of fuel injection helical lobe compressor, and described cold-producing medium gas phase channel is provided with J-T valve; The import of described cold-producing medium liquid channel is connected with the liquid-phase outlet of cold-producing medium separator, and the outlet of described cold-producing medium liquid channel is positioned at the middle part of heat-exchanger rig and communicates with described cold-producing medium gas phase channel, and described cold-producing medium liquid channel is provided with J-T valve; Described heat-exchanger rig is used for the fluid multi-component cold-producing medium of mixing and raw natural gas heat exchange and raw natural gas is liquefied.
2. system according to claim 1, is characterized in that, described heat-exchanger rig is ice chest.
3. system according to claim 1, is characterized in that, the gas outlet end of described heat-exchanger rig is provided with J-T valve.
4. system according to claim 1, is characterized in that, described system also comprises heavy hydrocarbon separator, and the import of described heavy hydrocarbon separator is all connected with the middle part of heat-exchanger rig with outlet, for separating of the heavy hydrocarbon in removing raw natural gas.
5. utilize a method for the multi-component refrigrant circularly cooling liquefied natural gas of the system described in claim 1, comprise the following steps:
A) multi-component refrigrant is carried out supercharging through fuel injection helical lobe compressor, obtain the multi-component refrigrant of oil-containing after supercharging;
B) by the multi-component refrigrant of oil-containing after described supercharging successively through lubricating oil separation device and lubricating filtering device, carry out oil removing, obtain the multi-component refrigrant after oil removing;
C) multi-component refrigrant after described oil removing is cooled through refrigerant cooler, obtain cooled multi-component refrigrant;
D) by described cooled multi-component refrigrant through cold-producing medium separator, obtain vapor phase refrigerant and liquid phase refrigerant;
E) described vapor phase refrigerant and liquid phase refrigerant are carried out step-down and cooling in heat-exchanger rig, obtain the fluid multi-component cold-producing medium mixed;
F) raw natural gas is carried out heat exchange with the described fluid multi-component cold-producing medium mixed in described heat-exchanger rig, obtain the gaseous-multicomponent cold-producing medium of liquefied natural gas and mixing; The gaseous-multicomponent cold-producing medium of described mixing is back to described fuel injection helical lobe compressor;
Described step a) ~ f) circulation carry out.
6. method according to claim 5, is characterized in that, described step a) in after supercharging the pressure of the multi-component refrigrant of oil-containing be 1.5MPa ~ 3.5MPa, temperature is 60 DEG C ~ 120 DEG C.
7. method according to claim 5, is characterized in that, described step b) in the lubricating oil content≤10mg/L of multi-component refrigrant after oil removing.
8. method according to claim 5, is characterized in that, described step c) in the temperature of cooled multi-component refrigrant be 20 DEG C ~ 45 DEG C.
9. method according to claim 5, is characterized in that, described step e) in the pressure of fluid multi-component cold-producing medium of mixing be 0.35MPa ~ 0.65MPa, temperature is-143 DEG C ~-165 DEG C.
10. method according to claim 5, is characterized in that, described step f) also comprise: in heat transfer process, by raw natural gas through heavy hydrocarbon separator, be separated the heavy hydrocarbon in removing raw natural gas.
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| FR3043451B1 (en) * | 2015-11-10 | 2019-12-20 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | METHOD FOR OPTIMIZING NATURAL GAS LIQUEFACTION |
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| CN104006627B (en) * | 2014-04-15 | 2016-01-06 | 张家港富瑞特种装备股份有限公司 | Liquefied natural gas mixed refrigerant circulation skid-mounted module |
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Effective date of registration: 20230327 Address after: 610000 No. 1-16, 42 / F, building 2, No. 88, Jitai fifth road, high tech Zone, Chengdu, Sichuan Patentee after: SICHUAN JEREH HENGRI NATURAL GAS ENGINEERING CO.,LTD. Address before: 264003 No. 9 Jerry Road, Laishan District, Shandong, Yantai Patentee before: JEREH OIL & GAS ENGINEERING Corp. |