CN109312752A - Compressor set including two centrifugal compressors and the liquefied natural gas plant including two centrifugal compressors - Google Patents

Compressor set including two centrifugal compressors and the liquefied natural gas plant including two centrifugal compressors Download PDF

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Publication number
CN109312752A
CN109312752A CN201780035122.6A CN201780035122A CN109312752A CN 109312752 A CN109312752 A CN 109312752A CN 201780035122 A CN201780035122 A CN 201780035122A CN 109312752 A CN109312752 A CN 109312752A
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CN
China
Prior art keywords
compressor
centrifugal
engine
centrifugal compressor
impeller
Prior art date
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Pending
Application number
CN201780035122.6A
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Chinese (zh)
Inventor
A·佩拉哥蒂
E·里佐
D·贝切鲁奇
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Novo Pinho Hei Technology Ltd By Share Ltd
Nuovo Pignone Technologie SRL
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Novo Pinho Hei Technology Ltd By Share Ltd
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Publication of CN109312752A publication Critical patent/CN109312752A/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D17/08—Centrifugal pumps
    • F04D17/10—Centrifugal pumps for compressing or evacuating
    • F04D17/12—Multi-stage pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/04—Units comprising pumps and their driving means the pump being fluid-driven
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/16—Combinations of two or more pumps ; Producing two or more separate gas flows
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/0002—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the fluid to be liquefied
    • F25J1/0022—Hydrocarbons, e.g. natural gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
    • F25J1/0047—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using an "external" refrigerant stream in a closed vapor compression cycle
    • F25J1/0052—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using an "external" refrigerant stream in a closed vapor compression cycle by vaporising a liquid refrigerant stream
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
    • F25J1/0047—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using an "external" refrigerant stream in a closed vapor compression cycle
    • F25J1/0052—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using an "external" refrigerant stream in a closed vapor compression cycle by vaporising a liquid refrigerant stream
    • F25J1/0055—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using an "external" refrigerant stream in a closed vapor compression cycle by vaporising a liquid refrigerant stream originating from an incorporated cascade
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/006—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the refrigerant fluid used
    • F25J1/008—Hydrocarbons
    • F25J1/0087—Propane; Propylene
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0211—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a multi-component refrigerant [MCR] fluid in a closed vapor compression cycle
    • F25J1/0214—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a multi-component refrigerant [MCR] fluid in a closed vapor compression cycle as a dual level refrigeration cascade with at least one MCR cycle
    • F25J1/0215—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a multi-component refrigerant [MCR] fluid in a closed vapor compression cycle as a dual level refrigeration cascade with at least one MCR cycle with one SCR cycle
    • F25J1/0216—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a multi-component refrigerant [MCR] fluid in a closed vapor compression cycle as a dual level refrigeration cascade with at least one MCR cycle with one SCR cycle using a C3 pre-cooling cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
    • F25J1/0279—Compression of refrigerant or internal recycle fluid, e.g. kind of compressor, accumulator, suction drum etc.
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
    • F25J1/0279—Compression of refrigerant or internal recycle fluid, e.g. kind of compressor, accumulator, suction drum etc.
    • F25J1/0285—Combination of different types of drivers mechanically coupled to the same refrigerant compressor, possibly split on multiple compressor casings
    • F25J1/0287—Combination of different types of drivers mechanically coupled to the same refrigerant compressor, possibly split on multiple compressor casings including an electrical motor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
    • F25J1/0279—Compression of refrigerant or internal recycle fluid, e.g. kind of compressor, accumulator, suction drum etc.
    • F25J1/029—Mechanically coupling of different refrigerant compressors in a cascade refrigeration system to a common driver
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
    • F25J1/0279—Compression of refrigerant or internal recycle fluid, e.g. kind of compressor, accumulator, suction drum etc.
    • F25J1/0294—Multiple compressor casings/strings in parallel, e.g. split arrangement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
    • F25J2230/20—Integrated compressor and process expander; Gear box arrangement; Multiple compressors on a common shaft
    • 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
    • F25J2290/00—Other details not covered by groups F25J2200/00 - F25J2280/00
    • F25J2290/12—Particular process parameters like pressure, temperature, ratios

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The disclosure provides a kind of compressor set (200), the compressor set includes engine (210), the first centrifugal compressor (220) driven by the engine (210) and the second centrifugal compressor (230) driven by the engine (210)；First centrifugal compressor (220) is contained in a shell；Second centrifugal compressor (230) is contained in a shell；First centrifugal compressor (220) has first entrance, and the first entrance is fluidly connected to high molecular weight gas pipeline, particularly, the pipeline of gas of the molecular weight higher than 40；Second centrifugal compressor (230) has second entrance, and the second entrance is fluidly connected to low-molecular-weight gas pipeline, particularly, the pipeline for the gas that molecular weight is 20 to 30；Second centrifugal compressor (230), which is arranged to provide, is higher than 10:1, the preferably higher than compression ratio of 15:1.

Description

Compressor set including two centrifugal compressors and including two centrifugal compressors The liquefied natural gas plant of machine
Technical field
The embodiment of theme disclosed in this specification correspond to include two centrifugal compressors compressor set and LNG [=liquefied natural gas] device including two centrifugal compressors.
Background technique
Fig. 1 shows the schematic diagram of liquefied natural gas plant 100 according to prior art, particularly, the liquefied natural gas Device is the device for implementing APCI technique, that is, including using a kind of first circulation of pure refrigerant and use a kind of mixing cause The known liquefaction technology of the second circulation of cryogen.
Device 100 includes the first compressor set and the second compressor set, wherein first compressor set includes centrifugation Formula compressor 130 and centrifugal compressor 160 and there is the first common axis, and second compressor set includes centrifugal Compressor 140 and centrifugal compressor 150 and have the second common axis.Compressor 130 is used for compressed propane；Compressor 130 Entrance 131 be fluidly connected to propane pipeline；The outlet 132 of compressor 130 provides compressed propane.Compressor 140,150 With 160 for compressing mixed cooling medium gas；The entrance 141 of compressor 140 is fluidly connected to mixed cooling medium pipeline；Compressor 140 outlet 142 is fluidly connected to the entrance 151 of compressor 150；The outlet 152 of compressor 150 is fluidly connected to compressor 160 entrance 161；The outlet 162 of compressor 160 provides compressed mixed cooling medium.
First compressor set is driven by the first engine 110, and second compressor set is by the second engine 120 drivings.First engine 110 and the second engine 120 are low speed engines, and for example be can be with such as 1500RPM Speed rotation motor (electric engine) or the combustion gas whirlpool that is rotated with the speed of such as 3000RPM or 3600RPM Turbine.
Each of described compressor 130,140,150 and 160 is contained in different shells.
A kind of liquefied natural gas plant known from WO 2008/015224 is filled including the first compression for propane It sets and is pressed for the second of " mixed cooling medium " referred to as (i.e. the mixture of the hydrocarbon with different molecular weight) Compression apparatus.Example process according to fig. 2 applies 18.5 compression ratio to the mixed cooling medium.In WO 2008/015224 Priority date, typically mixed cooling medium is compressed by three compressors being located in three different housings.This It is also applied for the solution of WO 2008/015224, this solution reflects Perez, and entitled " 4.5MMTBA liquefaction is natural Mechanism of qi group-one kind has cost-benefit design (The 4.5MMTBA LNG Train-A Cost Effective Design) " solution shown in Fig. 2 and 3 in the paper (quoted in WO 2008/015224)；As such, it is noted that Box 122 in Fig. 1 and 2 of WO 2008/015224 corresponds to intracorporal three compressors of three shells.In addition, according to WO 2008/015224, the first compression set and the second compression set are rotated (that is, being not provided with gear-box) with identical speed, and this The power ratio of a little compression sets can be with unrestricted choice.
Summary of the invention
It is intended to provide a kind of liquefied natural gas plant, solution has the liquefied natural gas plant compared with the existing technology It is reduced the compressor housing of quantity；This is also advantageous from the viewpoint of occupied area.
In general, improving efficiency, utilization rate and the modularity of liquefied natural gas plant and reducing liquefied natural gas plant CAPEX (Capital expenditure) is advantageous.
The liquefied natural gas plant of above-mentioned purpose and advantage especially suitable for implementing APCI technique.
The first embodiment of theme disclosed in this specification is related to a kind of compressor set.
According to the first embodiment, the compressor set includes engine, by engine-driven first centrifugation Formula compressor and by engine-driven second centrifugal compressor；First centrifugal compressor is contained in one In shell；Second centrifugal compressor is contained in a shell；First centrifugal compressor has first entrance, The first entrance is fluidly connected to high molecular weight gas pipeline, particularly, the pipeline of gas of the molecular weight higher than 40；Described Two centrifugal compressors have second entrance, and the second entrance is fluidly connected to low-molecular-weight gas pipeline, particularly, molecule The pipeline for the gas that amount is 20 to 30；Second centrifugal compressor, which is arranged to provide, is higher than 10:1, preferably higher than 15:1 Compression ratio.
The second embodiment of theme disclosed in this specification is related to a kind of liquefied natural gas plant.
According to the second embodiment, the liquefied natural gas plant includes compressor set, and the compressor set includes hair Motivation, by engine-driven first centrifugal compressor and by engine-driven second centrifugal compressor Machine；First centrifugal compressor is contained in a shell；Second centrifugal compressor is contained in a shell； First centrifugal compressor has first entrance, and the first entrance is fluidly connected to high molecular weight gas pipeline, especially Ground, the pipeline of gas of the molecular weight higher than 40；Second centrifugal compressor has second entrance, the second entrance fluid It is communicated to low-molecular-weight gas pipeline, particularly, the pipeline for the gas that molecular weight is 20 to 30；Second centrifugal compressor It is arranged to provide and is higher than 10:1, the preferably higher than compression ratio of 15:1.
Detailed description of the invention
Attached drawing includes in this specification and forming part of this specification, and there is shown with exemplary implementations of the invention Example, and these embodiments are explained together with specific embodiment part.In the accompanying drawings:
Fig. 1 shows the schematic diagram of liquefied natural gas plant according to prior art；
Fig. 2 shows the schematic diagrames of the embodiment of compressor set；
Fig. 3 shows the schematic diagram that can be the compressor embodiment of the component of compressor set shown in Fig. 2；And
Fig. 4 shows the schematic diagram of the embodiment of liquefied natural gas plant.
Specific embodiment
Exemplary embodiment is illustrated below in reference to attached drawing.
It is described below and is not intended to limit the present invention.On the contrary, the scope of the present invention is limited by appended claim.
" one embodiment " or " embodiment " referred to everywhere in specification means to combine spy described in some embodiment Determining feature, structure or characteristic includes at least one embodiment of published subject.Therefore, in specification full text differently The phrase " in one embodiment " that just occurs is not necessarily meant to refer to identical embodiment " in embodiment ".In addition, specific Feature, structure or characteristic can be combined into one or more embodiments in any appropriate manner.
Hereinafter (and according to its mathematical sense), term " group " indicates one group of one or more items.
Compressor set 200 shown in Fig. 2 include engine 210, by the engine 210 drive first it is centrifugal (i.e. Centrifugation stream) compressor 220 and second centrifugal (the i.e. centrifugation is flowed) compressor 230 that is driven by the engine 210.Described One centrifugal compressor 220 is contained in a shell；Second centrifugal compressor 230 is contained in a shell.Institute The first centrifugal compressor 220 is stated with first entrance, the first entrance is fluidly connected to high molecular weight gas pipeline, especially Ground, the pipeline of gas of the molecular weight higher than 40；Second centrifugal compressor 230 has second entrance, the second entrance It is fluidly connected to low-molecular-weight gas pipeline, particularly, the pipeline of gas of the molecular weight between 20 to 30.Therefore, by described Compressor 220 processing, then at first outlet 222 provide gas with by compressor 230 handle, then in second outlet The gas provided at 232 is different.
Second centrifugal compressor 230 is high compression ratio compressor；Particularly, second centrifugal compressor is arranged to It provides and is higher than 10:1, the preferably higher than compression ratio of 15:1.
With the same or similar unit of unit shown in Fig. 2 when being arranged to provide compressed propane and compressed mix It is particularly advantageous when both refrigerant is to implement APCI technique.In the case,
Above-mentioned high molecular weight gas is propane, and
Above-mentioned low-molecular-weight gas is mixed cooling medium gas, particularly, the mixing of propane, ethylene or ethane and methane Object.
Unit shown in Fig. 2 only includes two centrifugal compressors.
Fig. 2 shows two groups of embodiments.According to first group of embodiment, it is equipped with an axis, and the second compressor 230 is directly It is mechanically connected to the first compressor 220.According to second group of embodiment, if there are two axis, and the second compressor 230 passes through gear Case 250 is mechanically connected to the first compressor 220 indirectly.In Fig. 2, the gear-box is drawn with dotted line, because it is view feelings Condition setting.
It is suitable for first group of embodiment below.
The compressor set has single axis.
The engine 210 can be motor or steam turbine or combustion gas turbine, particularly, change-based combustion gas whirlpool of navigating Turbine.
The engine 210 is high speed engine, and the high speed engine preferably has in 5000RPM to 9000RPM Maximum (top) speed in range, more preferably with the maximum (top) speed in 6000RPM to 9000RPM range.
It is suitable for second group of embodiment below.
There are two axis for the compressor set tool.
Second centrifugal compressor 230 is mechanically connected to the first centrifugal compressor 220, institute by gear-box 250 Stating gear-box has the transmission ratio for being preferably higher than 2:1.
The engine 210 is motor or steam turbine or combustion gas turbine, and particularly, navigate change-based gas turbine Machine.
The engine 210 is low speed engine, and the low speed engine preferably has in 1500RPM to 5000RPM Maximum (top) speed in range more preferably has the maximum (top) speed in 1500RPM to 4000RPM range.
It is suitable for this two groups of embodiments below.
The unit may further include assisted engine, preferably motor, such as engine shown in Fig. 2 240.In Fig. 2, the engine 240 is directly connected to such as the second compressor 230.
It should be noted that the assisted engine can be used in the startup stage of the unit and/or when one or The power that multiple compressors are absorbed assists sustainer when exceeding specific threshold；The assisted engine is sometimes referred to as " auxiliary Mechanism (helper) ".
Embodiment according to Fig.3, high compression ratio compressor 230 are centrifugal (the i.e. centrifugation stream) compressions of high compression ratio Machine, and including first group of impeller (i.e. one or more impeller) and it is arranged in the downstream or upstream of first group of impeller Second group of impeller (i.e. one or more impellers) in (preferably downstream).
As shown in figure 3, first group of impeller include two impellers 311 and 312, but from 1 to such as 20 in Any number of impeller is also applicable.According to the present embodiment, second group of impeller includes three Hes of impeller 321 and 322 323, but from 1 to such as 20 in any number of impeller be also applicable.311 He of impeller in described first group 312 are centrifugal and are not equipped with shield.As shown in figure 3, the impeller 321 and 322 and 323 in described second group are centrifugations Formula and be equipped with shield.Impeller 311 and 312 at least first group and it is second group described in the He of impeller 321 and 322 323 are contained in a shell 300.Impeller 311 and 312 in first group and the impeller 321 and 322 and 323 in second group It is connected to each other by mechanical connection.
According to alternate embodiment, all impellers are all centrifugal and are equipped with shield.
The group number for being compressed axially grade can be with more than two, such as three or four.
One or more auxiliary entrances may be equipped with.
One or more pilot outlets may be equipped with.
Advantageously, such as in the embodiment shown in fig. 3, at least some leaves of the high compression ratio centrifugal compressor Wheel overlies one another and is connected by Hirth joint mechanical.The stacking and the impeller of connection are tightened together by pull rod, and And in this way, highly stable and reliable mechanical connection is realized.Each impeller is for example on its rotation axis Through-hole, and be arranged so that the pull rod can pass through.When impeller is stacked and tightened together, is formed and turned Son.
In the embodiment shown in fig. 3, all impellers 311,312,321,322,323 in described two groups stack；Pass through Hirth connector 340A, 340B, 340C, 340D connection；And it is tightened together by pull rod 330.
Compressor 230 has main-inlet 301 (label is in Fig. 2), primary outlet 302 (label is in Fig. 2), and Positioned at along from main-inlet 301 at least one auxiliary entrance of the middle position of the flow passage of primary outlet 302 and/or at least One pilot outlet；Fig. 3 shows the ordinary circumstance of a centre tap 303, and the centre tap is auxiliary in some embodiments It helps entrance (referring to upward arrow) and is pilot outlet in some embodiments (referring to down arrow).
Advantageously, as in the embodiment shown in fig. 3, second group of impeller (321 and 322 and 323) is in first group of leaf The downstream of (311 and 312) is taken turns, and the impeller (321 and 322 and 323) in described second group can have the leaf than first group Take turns (311 and 312) smaller diameter.
Embodiment according to Fig.3, the impeller in first group of impeller (311 and 312) be not equipped with shield and With the bigger diameter of the impeller in than second group impeller (321 and 322 and 323).
Due to not having shield, the impeller for not being equipped with shield can be than being equipped with the impeller of shield rotatably faster；Thing In reality, when the impeller is rotated, shield by act on centrifugal force on it be pulled outwardly it is dynamic, and in certain rotation speed Under, there is the risk for being drawn out impeller in shield.
By the rotor configuration of high compression ratio centrifugal compressor defined above, compressor can compare conventional centrifugal Compressor quickly rotates, to realize bigger compression ratio.
It should be noted that the impeller of the impeller and outfit shield that are not equipped with shield can be alternating with each other；This situation is special It can be when there are one or more auxiliary entrances and/or export.
It can quickly be rotated with the same or similar centrifugal compressor of compressor shown in Fig. 3, therefore they It can achieve very high compression ratio.Therefore, the single innovative centrifugal compressor in single (and small) shell can substitute In different housings two or three or more conventional centrifugal compressor.
Further, since the high rotation speed of impeller, can obtain high mass capture ratio.
(particularly, have and compressor shown in Fig. 3 by using with the same or similar unit of unit shown in Fig. 2 Same or similar compressor), in smaller space and/or in more small footprint size and smaller amounts machine can used High liquefied natural gas (LNG)-throughput is obtained in the case where device.
It should be noted that from the point of view of many visual angles, there is only a shell rather than two or more a shell are advantageous:
Simplify installation and maintenance,
Shorten maintenance time,
It improves reliability (component is less, and lower a possibility that failure),
Reduce the occupied area and weight of machine,
Gas leakage is reduced,
Reduce the complexity and size of lubricating oil system.
It is used in liquefied natural gas plant with the same or similar unit major design of unit shown in Fig. 2.
Fig. 4 shows the schematic diagram of the embodiment of the liquefied natural gas plant including two units；Gear-box is not shown But may exist.
In the described embodiment, the two units are advantageously identical.
In the described embodiment, the two units implement APCI technique.
In the described embodiment, the two units include and the same or similar compressor of compressor shown in Fig. 3.
Device device for example shown in Fig. 4 can have the power generally equalized with Fig. 1 shown device.Anyway, Fig. 4 Shown device is relative to an advantage of Fig. 1 shown device, if a member bursts of described device, shown in Fig. 1 Device can not generate any liquefied natural gas, and Fig. 4 will generate 50% rated output.

Claims (13)

1. a kind of compressor set (200), the compressor set includes engine (210), the driven by the engine (210) One centrifugal compressor (220) and the second centrifugal compressor (230) driven by the engine (210)；
Wherein first centrifugal compressor (220) is contained in a shell；
Wherein second centrifugal compressor (230) is contained in a shell；
Wherein first centrifugal compressor (220) has first entrance, and the first entrance is fluidly connected to high molecular weight Gas line, particularly, the pipeline of gas of the molecular weight higher than 40；
Wherein second centrifugal compressor (230) has second entrance, and the second entrance is fluidly connected to low molecular weight Gas line, particularly, the pipeline of gas of the molecular weight between 20 to 30；
Wherein second centrifugal compressor (230), which is arranged to provide, is higher than 10:1, the preferably higher than compression ratio of 15:1.
2. compressor set according to claim 1,
Wherein the high molecular weight gas is propane,
Wherein the low-molecular-weight gas is mixed cooling medium gas, particularly, the mixing of propane, ethylene or ethane and methane Object.
3. according to claim 1 or compressor set as claimed in claim 2, wherein the engine (210) is motor or steaming Steam turbine or combustion gas turbine, particularly, navigate change-based combustion gas turbine.
4. compressor set according to claim 3, wherein the engine (210) is high speed engine.
5. according to claim 1 or compressor set as claimed in claim 2, wherein second centrifugal compressor (230) is logical It crosses gear-box (250) and is mechanically connected to first centrifugal compressor (220), the gear-box, which has, is preferably higher than 2:1 Transmission ratio.
6. compressor set according to claim 5, wherein the engine (210) is motor or steam turbine or combustion Gas turbine, particularly, navigate change-based combustion gas turbine.
7. according to claim 5 or compressor set as claimed in claim 6, wherein the engine (210) is low speed engine.
8. further comprising assisted engine according to compressor set described in any claim in preceding claims (240)。
9. according to compressor set described in preceding claims 1 to any claim in claim 8,
Wherein second centrifugal compressor (230) include first group of impeller (411,412) and second group of impeller (421,422, 423)；
The impeller (411,412) in described first group is centrifugal and is not equipped with shield；
The impeller (421,422,423) in described second group is centrifugal and is equipped with shield.
10. according to compressor set described in preceding claims 1 to any claim in claim 8,
Wherein second centrifugal compressor (230) includes first group of impeller and second group of impeller；
The impeller in described first group is centrifugal and is equipped with shield；
The impeller in described second group is centrifugal and is equipped with shield.
11. a kind of liquefied natural gas plant (100), including according to preceding claims 1 to any right in claim 10 It is required that the compressor set (200).
12. liquefied natural gas plant (100) according to claim 10, including preceding claims 1 arrive claim 10 In any claim described in two compressor sets (200,300).
13. according to claim 11 or claim 12 described in liquefied natural gas plant (100), wherein described or each first Centrifugal compressor (220,320) is arranged to compression high molecular weight gas, wherein described or each second centrifugal compressor (230,330) are arranged to compression low-molecular-weight gas；Described or each first centrifugal compressor (220,320) and it is described or Each second centrifugal compressor (230,330) cooperation is with liquefied natural gas stream.
CN201780035122.6A 2016-06-07 2017-06-07 Compressor set including two centrifugal compressors and the liquefied natural gas plant including two centrifugal compressors Pending CN109312752A (en)

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