Low-temperature gas liquefaction and separation system applying effect of segregation

Low-temperature gas liquefaction and separation system applying effect of segregation

CN
  • CN 101,625,191 A
  • Filed: 08/10/2009
  • Published: 01/13/2010
  • Est. Priority Date: 08/10/2009
  • Status: Active Application
First Claim
Patent Images

1. the low-temperature gas liquefaction and separation system of an applying effect of segregation provides this low-temperature gas liquefaction and separation system institute chilling requirement with the polybasic mixture throttling refrigeration;

  • Described low-temperature gas liquefaction and separation system comprises compressor module (CU), cooling fractional condensation separation module (SU) and liquefaction separation module (TU);

    Described compressor module (CU), cooling fractional condensation separation module (SU) and liquefaction separation module (TU) link to each other by following order and form closed circuit;

    The high-pressure outlet of described compressor module (CU) connects the cold-producing medium high pressure entry of cooling fractional condensation separation module (SU);

    The cold-producing medium high-pressure outlet of cooling fractional condensation separation module (SU) connects the cold-producing medium high pressure entry of liquefaction separation module (TU);

    The cold-producing medium low tension outlet of liquefaction separation module (TU) connects the cold-producing medium low-pressure inlet of cooling fractional condensation separation module (SU), and the cold-producing medium low tension outlet of cooling fractional condensation separation module (SU) connects the low-pressure inlet of compressor module (CU);

    It is characterized in that;

    Described compressor module (CU) comprises compressor (CU1), first preceding cooler (CU21) and pipeline and the valve, and its connected mode is;

    the high-pressure outlet of compressor (CU1) connects the import of cooler (CU2);

    Cooler (CU2) outlet is the high-pressure outlet of compressor module (CU);

    The low pressure inlet of compressor (CU1) is the low pressure inlet of compressor module (CU);

    Described cooling fractional condensation separation module (SU) is made up of 1-5 level cooling fractional condensation segregant module, and described cooling fractional condensation segregant module is the first cooling fractional condensation segregant module (S1), the second cooling fractional condensation segregant module (S2), the 3rd cooling fractional condensation segregant module (S3), the 4th cooling fractional condensation segregant module (S4) or their any combination;

    The described first cooling fractional condensation segregant module (S1) is made up of intermediate liquid separation units (SUi_2), Intermediate Heat Exchanger (SUi_4) and connecting line thereof;

    Described intermediate liquid separation units (SUi_2) is made up of first return tank, first discharge valve and first return valve;

    Described first return tank liquid phase outlet links to each other with first return valve with first discharge valve respectively by a tee pipe fitting, and described first discharge valve is used for discharging products of separated to the external world;

    The first return tank import (C3) is the separated gas access of this intermediate liquid separation units (SUi_2), simultaneously also be the separated gas access of the described first cooling fractional condensation segregant module (S1), be used to connect the separated gas vent of previous stage cooling fractional condensation segregant module;

    The first return tank vapor phase exit (C4) links to each other with the separated gas feed (C5) of Intermediate Heat Exchanger (SUi_4) as the liquid-inlet that backflows, and the separated gas feed (C5) of this Intermediate Heat Exchanger (SUi_4) also is the liquid outlet that backflows simultaneously;

    The separated gas vent (C6) of the Intermediate Heat Exchanger (SUi_4) that is connected with the separated gas feed (C5) of described this Intermediate Heat Exchanger (SUi-4) by pipeline also is simultaneously the separated gas vent of the described first cooling fractional condensation segregant module (S1), is used to connect the separated gas access of back one-level cooling fractional condensation segregant module;

    Be parallel with six roots of sensation pipeline between the component inlet (Dj3) after the separating of component outlet (Dj4) and Intermediate Heat Exchanger (SUi_4) after the separation of Intermediate Heat Exchanger (SUi_4), then described Intermediate Heat Exchanger (SUi_4) has after six separation component outlet (Dj4) and component enter the mouth (Dj3) after six are separated;

    Component outlet (Dj4) also is simultaneously the backflow component and the outlet of final stage tail gas of the described first cooling fractional condensation segregant module (S1) after six separation of described Intermediate Heat Exchanger (SUi_4);

    Component inlet (Dj3) also is simultaneously the backflow component and the final stage gas inlet of the described first cooling fractional condensation segregant module (S1) after six separation of described Intermediate Heat Exchanger (SUi_4);

    Component outlet (Dj4) all is used to connect six interfaces that previous stage is cooled off the backflow component and the final stage gas inlet of fractional condensation segregant module according to the progression of cooling fractional condensation separation module (SU) after six separation of described Intermediate Heat Exchanger (SUi_4), or a part connects the backflow component and the final stage gas inlet of previous stage cooling fractional condensation segregant module, a part of low-temperature gas liquefaction and separation system that connects applying effect of segregation;

    Component inlet Dj3 is used to connect the corresponding interface that the back one-level is cooled off the backflow component and the outlet of final stage tail gas of fractional condensation segregant module after the separation of described Intermediate Heat Exchanger (SUi_4);

    First return valve connects the backflow component and the final stage gas inlet of previous stage cooling fractional condensation segregant module by connecting line;

    The cold-producing medium high pressure entry (A5) of Intermediate Heat Exchanger (SUi_4) is connected with the cold-producing medium high-pressure outlet (A6) of Intermediate Heat Exchanger (SUi_4) by pipeline, the cold-producing medium high pressure entry (A5) of described Intermediate Heat Exchanger (SUi_4) also is simultaneously the cold-producing medium high pressure entry of the described first cooling fractional condensation segregant module (S1), is used to connect the cold-producing medium high-pressure outlet of previous stage cooling fractional condensation segregant module;

    The cold-producing medium high-pressure outlet (A6) of described Intermediate Heat Exchanger (SUi_4) also is simultaneously the cold-producing medium high-pressure outlet of the described first cooling fractional condensation segregant module (S1), is used to connect the cold-producing medium high pressure entry of back one-level cooling fractional condensation segregant module;

    The cold-producing medium low-pressure inlet (B3) of Intermediate Heat Exchanger (SUi_4) is connected with the cold-producing medium low tension outlet (B4) of Intermediate Heat Exchanger (SUi_4) by pipeline, the cold-producing medium low-pressure inlet (B3) of described Intermediate Heat Exchanger (SUi_4) also is simultaneously the cold-producing medium low-pressure inlet of the described first cooling fractional condensation segregant module (S1), is used to connect the cold-producing medium low tension outlet of back one-level cooling fractional condensation segregant module;

    The cold-producing medium low tension outlet (B4) of described Intermediate Heat Exchanger (SUi_4) also is simultaneously the cold-producing medium low tension outlet of the described first cooling fractional condensation segregant module (S1), is used to connect the cold-producing medium low-pressure inlet of previous stage cooling fractional condensation segregant module;

    Separated gas separates to carrying out fractional condensation between the separated gas vent (C6) of middle heat exchanging segment (SUi_4) in intermediate liquid separation units (SUi_2) and gaseous phase outlet thereof;

    Intermediate liquid separation units (SUi_2) and a plurality of relatively independent assembly or the composite module for directly combine of middle heat exchanging segment (SUi_4) for being connected by pipeline;

    The described second cooling fractional condensation segregant module (S2) is made up of intermediate liquid separation units (SUi_2), refrigeration system liquid phase separation unit (SUi_3), Intermediate Heat Exchanger (SUi_4), refrigeration restricting element (SUi_5) and connecting line thereof;

    Described intermediate liquid separation units (SUi_2) is made up of first return tank, first discharge valve and first return valve;

    Described first return tank liquid phase outlet links to each other with return valve with first discharge valve respectively by a tee pipe fitting, and described first discharge valve is used for discharging products of separated to the external world;

    The first return tank import (C3) is the separated gas access of intermediate liquid separation units (SUi_2), simultaneously also be the separated gas access of the second cooling fractional condensation segregant module (S2), be used to connect the separated gas vent of previous stage cooling fractional condensation segregant module;

    The first return tank vapor phase exit (C4) links to each other with the separated gas feed (C5) of Intermediate Heat Exchanger (SUi_4) as the liquid-inlet that backflows, and the separated gas feed (C5) of this Intermediate Heat Exchanger (SUi_4) also is the liquid outlet that backflows simultaneously;

    The separated gas vent (C6) of the Intermediate Heat Exchanger (SUi_4) that is connected with the separated gas feed (C5) of described this Intermediate Heat Exchanger (SUi_4) by pipeline also is simultaneously the separated gas vent of the described second cooling fractional condensation segregant module (S2), is used to connect the separated gas access of back one-level cooling fractional condensation segregant module;

    Be parallel with six roots of sensation pipeline between the component inlet (Dj3) after the separating of component outlet (Dj4) and Intermediate Heat Exchanger (SUi_4) after the separation of Intermediate Heat Exchanger (SUi_4), then described Intermediate Heat Exchanger (SUi_4) has after six separation component outlet (Dj4) and component enter the mouth (Dj3) after six are separated;

    Component outlet (Dj4) also is simultaneously the backflow component and the outlet of final stage tail gas of the described second cooling fractional condensation segregant module (S2) after six separation of described Intermediate Heat Exchanger (SUi_4);

    Component inlet (Dj3) also is simultaneously the backflow component and the final stage gas inlet of the described second cooling fractional condensation segregant module (S2) after six separation of described Intermediate Heat Exchanger (SUi_4);

    Component outlet (Dj4) all is used to connect six interfaces that previous stage is cooled off the backflow component and the final stage gas inlet of fractional condensation segregant module according to the progression of cooling fractional condensation separation module (SU) after six separation of described Intermediate Heat Exchanger (SUi_4), or a part connects the backflow component and the final stage gas inlet of previous stage cooling fractional condensation segregant module, a part of low-temperature gas liquefaction and separation system that connects applying effect of segregation;

    Component inlet (Dj3) is used to connect the corresponding interface that the back one-level is cooled off the backflow component and the outlet of final stage tail gas of fractional condensation segregant module after the separation of described Intermediate Heat Exchanger (SUi_4);

    First return valve connects the backflow component and the final stage gas inlet of previous stage cooling fractional condensation segregant module by connecting line;

    Described refrigeration system liquid phase separation unit (SUi_3) is made up of second return tank and connecting line thereof;

    the second return tank import (A3) is this refrigeration system liquid phase separation unit (SUi_3) import, simultaneously also be the cold-producing medium high pressure entry of the second cooling fractional condensation segregant module (S2), be used to connect the cold-producing medium high-pressure outlet of previous stage cooling fractional condensation segregant module;

    The second return tank gaseous phase outlet (A4) connects the cold-producing medium high pressure entry (A5) of Intermediate Heat Exchanger (SUi_4) as the gaseous phase outlet of refrigeration system liquid phase separation unit (SUi_3);

    The described second return tank gaseous phase outlet (A4) also is simultaneously the import of liquid of backflowing;

    The outlet of the second return tank liquid phase is connected to the import of refrigeration restricting element (SUi_5) behind middle heat exchanging segment (SUi_4), the outlet of refrigeration restricting element (SUi_5) connects the cold-producing medium low-pressure inlet (B3) of Intermediate Heat Exchanger (SUi_4);

    By be connected with the cold-producing medium low-pressure inlet (B3) of described Intermediate Heat Exchanger (SUi_4) the cold-producing medium low tension outlet (B4) of Intermediate Heat Exchanger (SUi_4) of pipeline simultaneously also is the cold-producing medium low tension outlet of the described second cooling fractional condensation segregant module (S2), is used to connect the cold-producing medium low-pressure inlet of previous stage cooling fractional condensation segregant module;

    The cold-producing medium high pressure entry (A5) of Intermediate Heat Exchanger (SUi_4) is connected with the cold-producing medium high-pressure outlet (A6) of Intermediate Heat Exchanger (SUi_4) by pipeline, the cold-producing medium high pressure entry (A5) of described Intermediate Heat Exchanger (SUi_4) also is simultaneously the cold-producing medium high-pressure outlet of the described second cooling fractional condensation segregant module (S2), is used to connect the cold-producing medium high pressure entry of back one-level cooling fractional condensation segregant module;

    The cold-producing medium high-pressure outlet (A6) of described Intermediate Heat Exchanger (SUi_4) also is simultaneously the cold-producing medium high-pressure outlet of the described second cooling fractional condensation segregant module (S2), is used to connect the cold-producing medium high pressure entry of back one-level cooling fractional condensation segregant module;

    Separated gas separates to carrying out fractional condensation between the separated gas vent (C6) of middle heat exchanging segment (SUi_4) in intermediate liquid separation units (SUi_2) and gaseous phase outlet thereof;

    Cold-producing medium separates to carrying out fractional condensation between the cold-producing medium high-pressure outlet (A6) of middle heat exchanging segment (SUi_4) at refrigeration system liquid phase separation unit (SUi_3) and gaseous phase outlet thereof;

    Intermediate liquid separation units (SUi_2), refrigeration system liquid phase separation unit (SUi_3) and middle heat exchanging segment (SUi_4) an a plurality of relatively independent assembly or a composite module for directly combining for being connected by pipeline;

    Described the 3rd cooling fractional condensation segregant module (S3) is made up of intermediate liquid separation units (SUi_2), refrigeration system liquid phase separation unit (SUi_3), Intermediate Heat Exchanger (SUi_4), refrigeration restricting element (SUi_5), back heat exchanger unit (SUi_6) and connecting line thereof;

    Described intermediate liquid separation units (SUi_2) is made up of first return tank, first discharge valve and first return valve;

    Described first return tank liquid phase outlet links to each other with return valve with first discharge valve respectively by a tee pipe fitting, and described first discharge valve is used for discharging products of separated to the external world;

    The first return tank import (C3) is the separated gas access of intermediate liquid separation units (SUi_2), simultaneously also be the separated gas access of described the 3rd cooling fractional condensation segregant module (S3), be used to connect the separated gas vent of previous stage cooling fractional condensation segregant module;

    The first return tank vapor phase exit (C4) links to each other with the separated gas feed (C5) of Intermediate Heat Exchanger (SUi_4) as the liquid-inlet that backflows, and the separated gas feed (C5) of this Intermediate Heat Exchanger (SUi_4) also is the liquid outlet that backflows simultaneously;

    The separated gas vent (C6) of the Intermediate Heat Exchanger (SUi_4) that is connected by the pipeline and the separated gas feed (C5) of described Intermediate Heat Exchanger (SUi_4) is connected with the separated gas feed (C7) of back heat exchanger unit (SUi_6);

    The separated gas vent (C8) of the back heat exchanger unit (SUi_6) that is connected with the separated gas feed (C7) of described back heat exchanger unit (SUi_6) by pipeline, simultaneously also be the separated gas vent of described the 3rd cooling fractional condensation segregant module (S3), be used to connect the separated gas access of back one-level cooling fractional condensation segregant module;

    Be parallel with six roots of sensation pipeline between the component outlet (Dj2) after the separating of component inlet (Dj1) and back heat exchanger unit (SUi_6) after the separation of back heat exchanger unit (SUi_6), then described back heat exchanger unit (SUi_6) has after six separation component outlet (Dj2) and component enter the mouth (Dj1) after six are separated;

    Component inlet (Dj1) also is simultaneously the backflow component and the final stage gas inlet of described the 3rd cooling fractional condensation segregant module (S3) after six separation of described back heat exchanger unit (SUi_6), the corresponding interface of the backflow component and the outlet of final stage tail gas of one-level cooling fractional condensation segregant module after being used to connect;

    Component outlet (Dj2) all is used to connect six interfaces of component inlet (Dj3) after the separation of Intermediate Heat Exchanger (SUi_4) after the separation of described back heat exchanger unit (SUi_6) according to the progression of cooling fractional condensation separation module (SU), or component inlet (Dj3) after the separation of part connection Intermediate Heat Exchanger (SUi_4), a part connects the low-temperature gas liquefaction and separation system of applying effect of segregation;

    Be parallel with six roots of sensation pipeline between the component inlet (Dj3) after the separating of component outlet (Dj4) and Intermediate Heat Exchanger (SUi_4) after the separation of Intermediate Heat Exchanger (SUi_4), then described Intermediate Heat Exchanger (SUi_4) has after six separation component outlet (Dj4) and component enter the mouth (Dj3) after six are separated;

    Component outlet (Dj4) also is simultaneously the backflow component and the outlet of final stage tail gas of described the 3rd cooling fractional condensation segregant module (S3) after six separation of described Intermediate Heat Exchanger (SUi_4), progression according to cooling fractional condensation separation module (SU) all is used to connect six interfaces that previous stage is cooled off the backflow component and the final stage gas inlet of fractional condensation segregant module, or a part connects the backflow component and the final stage gas inlet of previous stage cooling fractional condensation segregant module, a part of low-temperature gas liquefaction and separation system that connects applying effect of segregation;

    First return valve connects the backflow component and the final stage gas inlet of previous stage cooling fractional condensation segregant module by connecting line;

    Described refrigeration system liquid phase separation unit (SUi_3) is made up of second return tank and connecting line thereof;

    the second return tank import (A3) is this refrigeration system liquid phase separation unit (SUi_3) import, simultaneously also be the cold-producing medium high pressure entry of described the 3rd cooling fractional condensation segregant module (S3), be used to connect the cold-producing medium high-pressure outlet of previous stage cooling fractional condensation segregant module;

    The second return tank gaseous phase outlet (A4) connects the cold-producing medium high pressure entry (A5) of Intermediate Heat Exchanger (SUi-4) as the gaseous phase outlet of this refrigeration system liquid phase separation unit (SUi_3), and the described second return tank gaseous phase outlet (A4) also is simultaneously the import of liquid of backflowing;

    The cold-producing medium high-pressure outlet (A6) of the Intermediate Heat Exchanger (SUi_4) that is connected by the pipeline and the cold-producing medium high pressure entry (A5) of described Intermediate Heat Exchanger (SUi_4) is connected with the cold-producing medium high-pressure inlet (A7) of back heat exchanger unit (SUi_6);

    The cold-producing medium high-pressure outlet (A8) of the back heat exchanger unit (SUi_6) that is connected with the cold-producing medium high-pressure inlet (A7) of described and described back heat exchanger unit (SUi_6) by pipeline, simultaneously also be the cold-producing medium high-pressure outlet of described the 3rd cooling fractional condensation segregant module (S3), be used to connect the cold-producing medium high pressure entry of back one-level cooling fractional condensation segregant module;

    The outlet of the second return tank liquid phase is connected to the import of refrigeration restricting element (SUi_5) behind middle heat exchanging segment (SUi_4), the outlet of refrigeration restricting element (SUi_5) connects the cold-producing medium low-pressure inlet (B3) of Intermediate Heat Exchanger (SUi_4) and the cold-producing medium low tension outlet (B2) of back heat exchanger unit (SUi_6) respectively by a tee pipe fitting;

    The cold-producing medium low-pressure inlet (B1) of the back heat exchanger unit (SUi_6) that is connected with the cold-producing medium low tension outlet (B2) of described back heat exchanger unit (SUi_6) by pipeline, simultaneously also be the cold-producing medium low-pressure inlet of described the 3rd cooling fractional condensation segregant module (S3), be used to connect the cold-producing medium low tension outlet of back one-level cooling fractional condensation segregant module;

    The cold-producing medium low tension outlet (B4) of the Intermediate Heat Exchanger (SUi_4) that is connected with the cold-producing medium low-pressure inlet (B3) of described Intermediate Heat Exchanger (SUi_4) by pipeline, simultaneously also be the cold-producing medium low tension outlet of described the 3rd cooling fractional condensation segregant module (S3), be used to connect the cold-producing medium low-pressure inlet of previous stage cooling fractional condensation segregant module;

    Separated gas separates to carrying out fractional condensation between the separated gas vent (C6) of middle heat exchanging segment (SUi_4) in intermediate liquid separation units (SUi_2) and gaseous phase outlet thereof;

    Cold-producing medium separates to carrying out fractional condensation between the cold-producing medium high-pressure outlet (A6) of middle heat exchanging segment (SUi_4) at refrigeration system liquid phase separation unit (SUi_3) and gaseous phase outlet thereof;

    Intermediate liquid separation units (SUi_2), refrigeration system liquid phase separation unit (SUi_3), middle heat exchanging segment (SUi_4) and back heat exchanger unit (SUi_6) an a plurality of relatively independent assembly or a composite module for directly combining for being connected by pipeline;

    Described the 4th cooling fractional condensation segregant module (S4) is made up of preceding heat exchanger unit (SUi_1), intermediate liquid separation units (SUi_2), refrigeration system liquid phase separation unit (SUi_3), Intermediate Heat Exchanger (SUi_4), refrigeration restricting element (SUi_5), back heat exchanger unit (SUi_6) and connecting line thereof;

    Described intermediate liquid separation units (SUi_2) is made up of first return tank, first discharge valve and first return valve;

    Described first return tank liquid phase outlet links to each other with return valve with first discharge valve respectively by a tee pipe fitting, and described first discharge valve is used for discharging products of separated to the external world;

    The first return tank import (C3) is connected with the separated gas vent (C2) of preceding heat exchanger unit (SUi_1) as the separated gas access of intermediate liquid separation units (SUi_2);

    By pipeline with described before the separated gas access (C1) of the preceding heat exchanger unit (SUi-_1) that is connected of the separated gas vent (C2) of heat exchanger unit (SUi_1), simultaneously also be the separated gas access of described the 4th cooling fractional condensation segregant module (S4), be used to connect the separated gas vent of previous stage cooling fractional condensation segregant module;

    The first return tank vapor phase exit (C4) links to each other with the separated gas access (C5) of Intermediate Heat Exchanger (SUi_4) as the liquid-inlet that backflows, and the separated gas access (C5) of this Intermediate Heat Exchanger (SUi_4) also is the liquid outlet that backflows simultaneously;

    The separated gas vent (C6) of the Intermediate Heat Exchanger (SUi-_4) that is connected by the pipeline and the separated gas access (C5) of described Intermediate Heat Exchanger (SUi_4) is connected with the separated gas access (C7) of back heat exchanger unit (SUi_6);

    The separated gas vent (C8) of the back heat exchanger unit (SUi_6) that is connected with the separated gas access (C7) of described back heat exchanger unit (SUi_6) by pipeline, simultaneously also be the separated gas vent of described the 4th cooling fractional condensation segregant module (S4), be used to connect the separated gas access of back one-level cooling fractional condensation segregant module;

    Be parallel with six roots of sensation pipeline between the component outlet (Dj2) after the separating of component inlet (Dj1) and back heat exchanger unit (SUi_6) after the separation of back heat exchanger unit (SUi_6), then described back heat exchanger unit (SUi_6) has after six separation component outlet (Dj2) and component enter the mouth (Dj1) after six are separated;

    Component inlet (Dj1) also is simultaneously the backflow component and the final stage gas inlet of described the 4th cooling fractional condensation segregant module (S4) after six separation of described back heat exchanger unit (SUi_6), the corresponding interface of the backflow component and the outlet of final stage tail gas of one-level cooling fractional condensation segregant module after being used to connect;

    Component outlet (Dj2) all is used to connect six interfaces of component inlet (Dj3) after the separation of Intermediate Heat Exchanger (SUi_4) after the separation of described back heat exchanger unit (SUi_6) according to the progression of cooling fractional condensation separation module (SU), or component inlet (Dj3) after the separation of part connection Intermediate Heat Exchanger (SUi_4), a part connects the low-temperature gas liquefaction and separation system of applying effect of segregation;

    Be parallel with six roots of sensation pipeline between the component inlet (Dj3) after the separating of component outlet (Dj4) and Intermediate Heat Exchanger (SUi_4) after the separation of Intermediate Heat Exchanger (SUi_4), then described Intermediate Heat Exchanger (SUi_4) has after six separation component outlet (Dj4) and component enter the mouth (Dj3) after six are separated;

    Component outlet (Dj4) all is used to connect six interfaces of component inlet (Dj5) after the separation of preceding heat exchanger unit (SUi_1) after six separation of described Intermediate Heat Exchanger (SUi_4) according to the progression of cooling fractional condensation separation module (SU), or component inlet (Dj5) after the separation of the preceding heat exchanger unit (SUi_1) of part connection, a part connects the low-temperature gas liquefaction and separation system of applying effect of segregation;

    Before be parallel with six roots of sensation pipeline between the component inlet (Dj5) after the separating of component outlet (Dj6) and preceding heat exchanger unit (SUi_1) after the separation of heat exchanger unit (SUi_1), then described before heat exchanger unit (SUi_1) component outlet (Dj6) is arranged after six separation and component enter the mouth (Dj5) after six are separated;

    Component outlet (Dj6) also is simultaneously the backflow component and the outlet of final stage tail gas of described the 4th cooling fractional condensation segregant module (S4) after six separation of described preceding heat exchanger unit (SUi_1), progression according to cooling fractional condensation separation module (SU) all is used to connect six interfaces that previous stage is cooled off the backflow component and the final stage gas inlet of fractional condensation segregant module, or a part connects the backflow component and the final stage gas inlet of previous stage cooling fractional condensation segregant module, a part of low-temperature gas liquefaction and separation system that connects applying effect of segregation;

    First return valve connects the backflow component and the final stage gas inlet of previous stage cooling fractional condensation segregant module by connecting line;

    Described refrigeration system liquid phase separation unit (SUi_3) is made up of second return tank and connecting line thereof;

    the second return tank import (A3) is connected with the cold-producing medium high-pressure outlet (A2) of preceding heat exchanger unit (SUi_1);

    By pipeline with described before the cold-producing medium high pressure entry (A1) of the preceding heat exchanger unit (SUi-_1) that is connected of the cold-producing medium high-pressure outlet (A2) of heat exchanger unit (SUi_1) also be simultaneously the cold-producing medium high pressure entry of described the 4th cooling fractional condensation segregant module (S4), be used to connect the cold-producing medium high-pressure outlet of previous stage cooling fractional condensation segregant module;

    The second return tank gaseous phase outlet (A4) connects the cold-producing medium high pressure entry (A5) of Intermediate Heat Exchanger (SUi_4) as the gaseous phase outlet of this refrigeration system liquid phase separation unit (SUi_3), and the described second return tank gaseous phase outlet (A4) also is simultaneously the import of liquid of backflowing;

    The cold-producing medium high-pressure outlet (A6) of the Intermediate Heat Exchanger (SUi_4) that is connected by the pipeline and the cold-producing medium high pressure entry (A5) of described Intermediate Heat Exchanger (SUi_4) is connected with the cold-producing medium high-pressure inlet (A7) of back heat exchanger unit (SUi_6);

    The cold-producing medium high-pressure outlet (A8) of the back heat exchanger unit (SUi_6) that is connected with the cold-producing medium high-pressure inlet (A7) of described back heat exchanger unit (SUi_6) by pipeline, simultaneously also be the cold-producing medium high-pressure outlet of described the 4th cooling fractional condensation segregant module (S4), be used to connect the cold-producing medium high pressure entry of back one-level cooling fractional condensation segregant module;

    The outlet of the second return tank liquid phase is connected to the import of refrigeration restricting element (SUi_5) behind middle heat exchanging segment (SUi_4), the outlet of refrigeration restricting element (SUi_5) connects the cold-producing medium low-pressure inlet (B3) of Intermediate Heat Exchanger (SUi_4) and the cold-producing medium low tension outlet (B2) of back heat exchanger unit (SUi_6) respectively by a tee pipe fitting;

    The cold-producing medium low-pressure inlet (B1) of the back heat exchanger unit (SUi_6) that is connected with the cold-producing medium low tension outlet (B2) of described back heat exchanger unit (SUi_6) by pipeline also is simultaneously the cold-producing medium low-pressure inlet of described the 4th cooling fractional condensation segregant module (S4), is used to connect the cold-producing medium low tension outlet of back one-level cooling fractional condensation segregant module;

    The cold-producing medium low tension outlet (B4) of the Intermediate Heat Exchanger (SUi_4) that is connected by the pipeline and the cold-producing medium low-pressure inlet (B3) of described Intermediate Heat Exchanger (SUi_4) is connected with the cold-producing medium low-pressure inlet (B5) of preceding heat exchanger unit (SUi_1);

    By pipeline with described before the cold-producing medium low tension outlet (B6) of the preceding heat exchanger unit (SUi_1) that is connected of the cold-producing medium low-pressure inlet (B5) of heat exchanger unit (SUi_1) also be simultaneously the cold-producing medium low tension outlet of described the 4th cooling fractional condensation segregant module (S4), be used to connect the cold-producing medium low-pressure inlet of previous stage cooling fractional condensation segregant module;

    Separated gas separates to carrying out fractional condensation between the separated gas vent (C6) of middle heat exchanging segment (SUi_4) in intermediate liquid separation units (SUi_2) and gaseous phase outlet thereof;

    Cold-producing medium separates to carrying out fractional condensation between the cold-producing medium high-pressure outlet (A6) of middle heat exchanging segment (SUi_4) at refrigeration system liquid phase separation unit (SUi_3) and gaseous phase outlet thereof;

    Preceding heat exchanger unit (SUi_1), intermediate liquid separation units (SUi_2), refrigeration system liquid phase separation and return tank (SUi_3), middle heat exchanging segment (SUi_4) and back heat exchanger unit (SUi_6) an a plurality of relatively independent assembly or a composite module for directly combining for being connected by pipeline;

    Described liquefaction separation module (TU) comprises liquid phase separation reflux unit (TU1), evaporative condenser section (TU3), restricting element (TU4) and pipeline thereof;

    Described liquid phase separation reflux unit (TU1) is made up of the 3rd return tank, the 3rd discharge valve, the 3rd return valve and pipeline thereof;

    Described the 3rd return tank liquid phase outlet links to each other with the 3rd return valve with the 3rd discharge valve respectively by a tee pipe fitting, and described the 3rd discharge valve is used for discharging products of separated to the external world;

    The inlet of the 3rd return tank (I1) is the separated gas access of liquid phase separation reflux unit (TU1), also be the separated gas access of this liquefaction separation module simultaneously, be used for connecting the separated gas vent of cooling fractional condensation separation module (SU) afterbody cooling fractional condensation segregant module;

    The gaseous phase outlet of the 3rd return tank (I2) links to each other with the separated gas access (I5) of evaporative condenser section (TU3) as the liquid inlet of backflowing, and the separated gas feed (I5) of this evaporative condenser section (TU3) also is the liquid outlet that backflows simultaneously;

    The separated gas vent (I6) of the evaporative condenser section (TU3) that is connected with the separated gas access (I5) of described evaporative condenser section (TU3) by pipeline is used to discharge the gas that is not liquefied for the separated gas vent of liquefaction separation module (TU);

    Described the 3rd return valve connects the backflow component and the final stage gas inlet of cooling fractional condensation separation module (SU) afterbody cooling fractional condensation segregant module by connecting line;

    The cold-producing medium high-pressure outlet of the last grade cooling fractional condensation segregant module of refrigerated separation module (SU) connects the inlet of restricting element (TU4), and the inlet of restricting element (TU4) is the cold-producing medium high pressure entry of described liquefaction separation module (TU);

    The outlet of restricting element (TU4) connects the cold-producing medium low-pressure inlet (H1) of evaporative condenser section (TU3);

    The cold-producing medium low tension outlet (H2) of the evaporative condenser section (TU3) that is connected by the pipeline and the cold-producing medium low-pressure inlet (H1) of described evaporative condenser section (TU3) is connected the cold-producing medium low-pressure inlet of the last grade cooling fractional condensation segregant module of refrigerated separation module (SU) as the cold-producing medium low tension outlet of described liquefaction separation module (TU);

    Separated gas separates to carrying out fractional condensation between the separated gas vent (I6) of evaporative condenser section (TU3) at liquid phase separation reflux unit (TU1) and gaseous phase outlet (I2) thereof;

    Liquid phase separation reflux unit (TU1) and a plurality of relatively independent assembly or the composite module for directly combine of evaporative condenser section (TU3) for being connected by pipeline.

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