WO2023159890A1 - Système de séparation de boîte froide de réfrigérant à composants multiples pour la déshydrogénation de propane, et procédé de traitement - Google Patents

Système de séparation de boîte froide de réfrigérant à composants multiples pour la déshydrogénation de propane, et procédé de traitement Download PDF

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WO2023159890A1
WO2023159890A1 PCT/CN2022/112627 CN2022112627W WO2023159890A1 WO 2023159890 A1 WO2023159890 A1 WO 2023159890A1 CN 2022112627 W CN2022112627 W CN 2022112627W WO 2023159890 A1 WO2023159890 A1 WO 2023159890A1
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gas
channel
refrigerant
heat exchanger
main heat
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PCT/CN2022/112627
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English (en)
Chinese (zh)
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章有虎
韦小雄
苟文广
张国兴
黄成华
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杭州中泰深冷技术股份有限公司
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Publication of WO2023159890A1 publication Critical patent/WO2023159890A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/06—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation
    • F25J3/0605—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation characterised by the feed stream
    • F25J3/062—Refinery gas, cracking gas, coke oven gas, gaseous mixtures containing aliphatic unsaturated CnHm or gaseous mixtures of undefined nature
    • 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
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/06—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation
    • F25J3/063—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation characterised by the separated product stream
    • F25J3/0655—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation characterised by the separated product stream separation of hydrogen
    • 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
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/06—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation
    • F25J3/063—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation characterised by the separated product stream
    • F25J3/0645—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation characterised by the separated product stream separation of CnHm with 3 carbon atoms or more
    • 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
    • F25J5/00—Arrangements of cold exchangers or cold accumulators in separation or liquefaction plants
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2210/00—Processes characterised by the type or other details of the feed stream
    • F25J2210/12—Refinery or petrochemical off-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
    • F25J2210/00—Processes characterised by the type or other details of the feed stream
    • F25J2210/62—Liquefied natural gas [LNG]; Natural gas liquids [NGL]; Liquefied petroleum gas [LPG]
    • 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
    • F25J2235/00—Processes or apparatus involving steps for increasing the pressure or for conveying of liquid process streams
    • F25J2235/60—Processes or apparatus involving steps for increasing the pressure or for conveying of liquid process streams the fluid being (a mixture of) hydrocarbons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2270/00—Refrigeration techniques used
    • F25J2270/18—External refrigeration with incorporated cascade loop
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2270/00—Refrigeration techniques used
    • F25J2270/66—Closed external refrigeration cycle with multi component refrigerant [MCR], e.g. mixture of hydrocarbons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2270/00—Refrigeration techniques used
    • F25J2270/90—External refrigeration, e.g. conventional closed-loop mechanical refrigeration unit using Freon or NH3, unspecified external refrigeration
    • F25J2270/904—External refrigeration, e.g. conventional closed-loop mechanical refrigeration unit using Freon or NH3, unspecified external refrigeration by liquid or gaseous cryogen in an open loop
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/10—Process efficiency

Definitions

  • the invention relates to the technical field of chemical cryogenic separation, in particular to a multi-element refrigerant cold box separation system and process method for propane dehydrogenation.
  • the cold box separation system is one of the most important and critical devices in the propane dehydrogenation plant.
  • the cold box separation system currently in operation in China can meet the basic requirements of the process for the product, there are still a large number of equipment, start-up and operation procedures.
  • the disadvantages are cumbersome, complicated device maintenance and operation, and high overall energy consumption of the factory.
  • the cold box separation system and supporting process technologies also need to be continuously improved and optimized to adapt to new technological developments. Therefore, the development of advanced new cold box separation system and process method can bring better quality products and more considerable economic benefits to propane dehydrogenation plants.
  • the object of the present invention is to provide a multi-element refrigerant cold box separation system for propane dehydrogenation with stable cooling capacity and low total system energy consumption, so as to solve the problems described in the background technology.
  • Another object of the present invention is to provide a multi-element refrigerant cold box separation process for propane dehydrogenation.
  • a multi-component refrigerant cold box separation system for propane dehydrogenation including a main heat exchanger, a multi-component refrigerant compressor, a multi-component refrigerant separator, a primary gas-liquid separator for reaction gas, a secondary gas-liquid separator for reaction gas, Precooling refrigerant separator, cryogenic refrigerant separator, liquid product buffer tank, first pipeline, second pipeline, third pipeline, fourth pipeline, fifth pipeline and sixth pipeline;
  • the main heat exchanger is provided with a reaction gas precooling channel, a reaction gas cryogenic channel, a propane feeding channel, a propane vaporization channel, a precooling refrigerant channel, a cryogenic refrigerant channel, a multiple refrigerant return flow channel, Clean gas product channel, liquid product channel and flash gas channel;
  • the first pipeline is sequentially connected to the reaction gas pre-cooling channel of the main heat exchanger, the primary gas-liquid separator of the reaction gas, the cryogenic channel of the reaction gas of the main heat exchanger, the secondary gas-liquid separator of the reaction gas and the main exchanger.
  • the clean gas product channel of the heater is sequentially connected to the reaction gas pre-cooling channel of the main heat exchanger, the primary gas-liquid separator of the reaction gas, the cryogenic channel of the reaction gas of the main heat exchanger, the secondary gas-liquid separator of the reaction gas and the main exchanger.
  • the second pipeline connects the reaction gas primary gas-liquid separator and the reaction gas secondary gas-liquid separator to the inlet of the liquid product buffer tank, and connects the liquid product buffer tank liquid phase outlet to the liquid product channel of the main heat exchanger ;
  • the third pipeline connects the gas phase outlet of the liquid product buffer tank to the flash gas channel of the main heat exchanger
  • the fourth pipeline is sequentially connected to the liquid phase outlet of the multi-component refrigerant separator, the pre-cooling refrigerant passage of the main heat exchanger, the pre-cooling refrigerant separator, the multi-component refrigerant return flow channel of the main heat exchanger, the multi-component refrigerant Compressor and multi-element refrigerant separator inlet;
  • the fifth pipeline is sequentially connected to the gas phase outlet of the multi-element refrigerant separator, the cryogenic refrigerant passage of the main heat exchanger, the cryogenic refrigerant separator and the multi-element refrigerant return passage of the main heat exchanger;
  • the sixth pipeline connects the propane feed passage and the propane vaporization passage of the main heat exchanger.
  • the second pipeline is provided with a first throttling valve between the reaction gas primary gas-liquid separator and the inlet of the liquid product buffer tank, and the second pipeline is between the reaction gas secondary gas-liquid separator and the liquid product
  • a second throttle valve between the inlet of the buffer tank
  • the second pipeline is equipped with a liquid product pump between the liquid phase outlet of the liquid product buffer tank and the liquid product channel of the main heat exchanger
  • the fourth pipeline is between the main heat exchanger
  • a third throttling valve is set between the pre-cooling refrigerant channel of the heat exchanger and the pre-cooling refrigerant separator
  • the fifth pipeline is set between the cryogenic refrigerant channel of the main heat exchanger and the cryogenic refrigerant separator.
  • the fourth throttle valve, the sixth pipeline is provided with a fifth throttle valve between the propane feed channel and the propane gasification channel of the main heat exchanger.
  • the main heat exchanger is an aluminum plate-fin heat exchanger
  • the liquid product pump is a vertical barrel pump.
  • a method for separation of propane dehydrogenation in a multi-element refrigerant cold box at least includes the following steps:
  • the high-pressure reaction gas output by the external reaction gas compressor enters the reaction gas pre-cooling channel of the main heat exchanger and is pre-cooled, then enters the reaction gas primary gas-liquid separator and is separated into primary gas phase reaction gas and primary liquid phase Reaction gas, the primary gas phase reaction gas is discharged from the gas phase outlet of the primary gas-liquid separator and enters the reaction gas cryogenic channel of the main heat exchanger.
  • the reaction gas After being cryogenically cooled, the reaction gas enters the secondary gas-liquid separator and is separated into secondary Gas-phase reaction gas and secondary liquid-phase reaction gas, the secondary gas-phase reaction gas is discharged from the gas-phase outlet of the secondary gas-liquid separator and then enters the net gas product channel of the main heat exchanger to be collected to obtain the net gas product;
  • the first-stage liquid-phase reaction gas and the second-stage liquid-phase reaction gas are respectively discharged from the liquid phase outlet of the first-stage gas-liquid separator of the reaction gas and the liquid-phase outlet of the second-stage gas-liquid separator of the reaction gas, and enter the liquid product buffer tank after throttling and depressurization , and then pressurized into the liquid product channel of the main heat exchanger to be reheated to obtain a liquid product;
  • the flash gas generated by the liquid product buffer tank is discharged from the gas phase outlet of the bulk product buffer tank and enters the flash gas channel of the main heat exchanger to be reheated, and then enters the external reaction gas compressor for recirculation;
  • the liquid propane raw material enters the propane feed channel of the main heat exchanger and is cooled, and after leaving the main heat exchanger, it is throttled and depressurized and then enters the propane gasification channel of the main heat exchanger to be completely vaporized to obtain gas propane;
  • the multi-element refrigerant is pressurized by the multi-element refrigerant compressor and separated into liquid-phase refrigerant and gas-phase refrigerant by the multi-element refrigerant separator; the liquid-phase refrigerant enters the pre-cooling refrigerant channel of the main heat exchanger as a pre-cooling refrigerant Condensation, after the main heat exchanger is throttled and reduced, it enters the pre-coolant separator and is evenly distributed by gas-liquid separation.
  • the gas-phase refrigerant enters the cryogenic refrigerant channel of the main heat exchanger as a cryogenic refrigerant to be condensed, and after the main heat exchanger is throttled and depressurized, it enters the cryogenic refrigerant separator and is separated by gas and liquid After uniform distribution, the multi-element refrigerant return channel entering the main heat exchanger is reheated, and returns to the multi-element refrigerant compressor to repressurize and continue the cycle.
  • the pressure setting range of the reaction gas entering the reaction gas precooling channel of the main heat exchanger is 0.8-1.5 MPa, and the temperature setting range is 30-55°C.
  • the pressure setting range of the liquid propane raw material entering the propane feed channel of the main heat exchanger is 1-2Mpa, and the temperature setting range is 30-55°C.
  • the inlet pressure setting range of the multi-element refrigerant compressor is 0.05-0.3 MPa
  • the temperature setting range is 25-50° C.
  • the outlet pressure setting range of the multi-element refrigerant compressor is 3-5 MPa.
  • the temperature setting range of the liquid product discharged from the liquid product channel of the main heat exchanger is -30-10°C.
  • the pressure setting range of the purified gas product is 0.6-1.3 MPa, and the temperature setting range is 25-50°C.
  • the pressure setting range of the propane gas is 0.1-0.5 MPa, and the temperature setting range is 25-50°C.
  • the pressure setting range of the flash gas discharged from the flash gas channel of the main heat exchanger is 0.8-1.5 MPa, and the temperature setting range is 25-50°C.
  • the present invention has the following advantages:
  • a multi-element refrigerant cold box separation system for propane dehydrogenation of the present invention adopts a refrigeration method combining multi-element refrigerant refrigeration and liquid propane raw material gasification refrigeration to provide cooling capacity for each channel in the main heat exchanger, through reasonable Equipment layout and process design, to overcome the problem of excessive circulating hydrogen flow rate in the existing system and process and excessive energy consumption of the system as a whole, under the condition of reducing the circulating hydrogen flow rate, to meet the requirements of high purity hydrogen product and high recovery rate of propylene product Requirements, reduce the number of equipment, maintain a more stable cooling supply, and there is no circulating gas mixed in the liquid propane raw material gasification, and there is no circulating gas in the reaction gas, which can reduce the energy consumption of the external reaction gas compressor.
  • Fig. 1 is a schematic diagram of the multi-element refrigerant cold box separation system for propane dehydrogenation of the present invention.
  • the embodiment of the invention discloses a multi-element refrigerant cold box separation system for propane dehydrogenation with stable cooling capacity and low total system energy consumption.
  • the multi-component refrigerant cold box separation system for propane dehydrogenation includes a main heat exchanger 2, a multi-component refrigerant compressor 1, a multi-component refrigerant separator 9, a reaction gas primary gas-liquid separator 3, a reaction gas Gas secondary gas-liquid separator 4, precooling refrigerant separator 7, cryogenic refrigerant separator 8, liquid product buffer tank 5, first pipeline 10, second pipeline 11, third pipeline 12, The fourth pipeline 13 , the fifth pipeline 14 and the sixth pipeline 15 .
  • the main heat exchanger 2 is an aluminum plate-fin heat exchanger, and the main heat exchanger 2 is equipped with a reaction gas pre-cooling channel, a reaction gas cryogenic channel, a propane feeding channel, a propane gasification channel, a pre-cooling agent channel, cryogenic refrigerant channel, multiple refrigerant return channel, net gas product channel, liquid product channel and flash gas channel.
  • the first pipeline 10 is sequentially connected to the reaction gas pre-cooling passage of the main heat exchanger 2, the reaction gas primary gas-liquid separator 3, the reaction gas cryogenic passage of the main heat exchanger 2, and the reaction gas secondary gas-liquid separator 4 And the clean gas product channel of the main heat exchanger 2.
  • the second pipeline 11 respectively connects the reaction gas primary gas-liquid separator 3 and the reaction gas secondary gas-liquid separator 4 to the inlet of the liquid product buffer tank 5, and connects the liquid phase outlet of the liquid product buffer tank 5 to the main heat exchanger 2 channel for liquid products.
  • the second pipeline 11 is provided with a first throttle valve 16 between the reaction gas primary gas-liquid separator 3 and the liquid product buffer tank 5 inlet, and the second pipeline 11 is between the reaction gas secondary gas-liquid separator 4 and the liquid product.
  • a second throttle valve 17 is arranged between the inlets of the product buffer tank 5, and a liquid product pump 6 is arranged between the liquid product outlet of the liquid product buffer tank 5 and the liquid product channel of the main heat exchanger 2 in the second pipeline 11.
  • the product pump 6 is a vertical drum pump.
  • the third pipeline 12 connects the gas phase outlet of the liquid product buffer tank 5 to the flash gas channel of the main heat exchanger 2 .
  • the fourth pipeline 13 is sequentially connected to the liquid phase outlet of the multi-element refrigerant separator 9, the pre-coolant refrigerant passage of the main heat exchanger 2, the pre-coolant refrigerant separator 7, the multi-element refrigerant return passage of the main heat exchanger 2,
  • the multi-element refrigerant compressor 1 and the multi-element refrigerant separator 9 are imported.
  • the fourth pipeline 13 is provided with a third throttling valve 18 between the pre-cooling refrigerant channel of the main heat exchanger 2 and the pre-cooling refrigerant separator 7
  • the fifth pipeline 14 is sequentially connected to the gas phase outlet of the multi-element refrigerant separator 9, the cryogenic refrigerant passage of the main heat exchanger 2, the cryogenic refrigerant separator 8 and the multi-element refrigerant return passage of the main heat exchanger 2, and then Into the part of the fourth pipeline 13 between the multi-element refrigerant return channel of the main heat exchanger 2 and the inlet of the multi-element refrigerant separator 9 .
  • the fifth pipeline 14 is provided with a fourth throttle valve 19 between the cryogenic refrigerant channel of the main heat exchanger 2 and the cryogenic refrigerant separator 8 .
  • the sixth pipeline 15 connects the propane feed channel and the propane gasification channel of the main heat exchanger 2 .
  • the sixth pipeline 15 is provided with a fifth throttle valve 20 between the propane feed channel and the propane gasification channel of the main heat exchanger 2 .
  • the first pipeline 10, the second pipeline 11, the third pipeline 12, the fourth pipeline 13, the fifth pipeline 14 and the sixth pipeline 15 are respectively composed of A combination of pipes located between devices and connected to related devices.
  • the embodiment of the present invention also discloses a multi-component refrigerant cold box separation process method for propane dehydrogenation based on the above-mentioned multi-element refrigerant cold box separation system for propane dehydrogenation.
  • the method at least has the following steps:
  • the high-pressure reaction gas output by the external reaction gas compressor enters the reaction gas pre-cooling channel of the main heat exchanger 2 and is pre-cooled.
  • Liquid-phase reaction gas, first-stage gas-phase reaction gas is discharged from the gas-phase outlet of the first-stage gas-liquid separator and enters the reaction gas cryogenic channel of the main heat exchanger 2.
  • the reaction gas After being cryogenically cooled, the reaction gas enters the second-stage gas-liquid separator 4 and is Separation into secondary gas phase reaction gas and secondary liquid phase reaction gas, the secondary gas phase reaction gas is discharged from the gas phase outlet of the secondary gas-liquid separator and then enters the net gas product channel of the main heat exchanger 2 to be collected to obtain the net gas product;
  • the first-stage liquid-phase reaction gas and the second-stage liquid-phase reaction gas are respectively discharged from the liquid phase outlet of the first-stage gas-liquid separator 3 of the reaction gas and the liquid-phase outlet of the second-stage gas-liquid separator 4 of the reaction gas, and then enter the liquid product through throttling and depressurization
  • the buffer tank 5 is then pressurized into the liquid product channel of the main heat exchanger 2 to be rewarmed to obtain the liquid product;
  • the flash gas generated by the liquid product buffer tank 5 is discharged from the gas phase outlet of the bulk product buffer tank and then enters the flash gas channel of the main heat exchanger 2 to be reheated, and then flows into the external reaction gas compressor for recirculation;
  • the liquid propane raw material enters the propane feed channel of the main heat exchanger 2 and is cooled, and after leaving the main heat exchanger 2, it is throttled and depressurized and then enters the propane gasification channel of the main heat exchanger 2 to be completely vaporized to obtain gas propane;
  • the multi-element refrigerant is pressurized by the multi-element refrigerant compressor 1 and then separated into a liquid-phase refrigerant and a gas-phase refrigerant by the multi-element refrigerant separator 9;
  • the refrigerant channel is condensed, the main heat exchanger 2 is throttled and depressurized, and then enters the pre-cooling refrigerant separator 7 and is evenly distributed by gas-liquid separation.
  • the multi-component refrigerant return channel entering the main heat exchanger 2 is reheated Return to the multi-component refrigerant compressor 1 to re-pressurize and continue the cycle; the gas-phase refrigerant enters the cryogenic refrigerant channel of the main heat exchanger 2 as a cryogenic refrigerant to be condensed, and the main heat exchanger 2 is throttled and depressurized to enter the deep cryogenic refrigerant channel.
  • the multi-element refrigerant return channel entering the main heat exchanger 2 is reheated, and returns to the multi-element refrigerant compressor 1 to repressurize and continue the cycle.
  • the pressure setting range of the reaction gas entering the reaction gas precooling channel of the main heat exchanger 2 is 0.8-1.5 MPa, and the temperature setting range is 30-55°C.
  • the pressure setting range of the liquid propane raw material entering the propane feed channel of the main heat exchanger 2 is 1-2Mpa, and the temperature setting range is 30-55°C.
  • the setting range of the inlet pressure of the multi-component refrigerant compressor 1 is 0.05-0.3 MPa, the setting range of the temperature is 25-50° C., and the setting range of the outlet pressure of the multi-component refrigerant compressor 1 is 3-5 MPa.
  • the outlet pressure setting range of the liquid product pump 6 is 1-4 MPa.
  • the temperature setting range of the liquid product discharged from the liquid product channel of the main heat exchanger 2 is -30-10°C.
  • the pressure setting range of the clean gas product is 0.6 ⁇ 1.3MPa, and the temperature setting range is 25 ⁇ 50°C.
  • the pressure setting range of gas propane is 0.1-0.5MPa, and the temperature setting range is 25-50°C.
  • the pressure setting range of the flash gas discharged from the flash gas channel of the main heat exchanger 2 is 0.8-1.5 MPa, and the temperature setting range is 25-50°C.
  • the embodiment of the present invention adopts a refrigeration method combining multi-element refrigerant refrigeration and liquid propane raw material vaporization refrigeration to provide cooling capacity for each channel in the main heat exchanger 2, so as to overcome the excessive flow rate of circulating hydrogen in the existing system and process.
  • the problem of excessive overall energy consumption meets the high-purity requirements of propylene products under the condition of reducing the circulating hydrogen flow rate, and reduces the number of equipment to maintain a more stable supply of cooling capacity, and no circulating gas is mixed in the gasification of liquid propane raw materials , and there is no recycle gas in the reaction gas, which can reduce the energy consumption of the external reaction gas compressor.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Separation By Low-Temperature Treatments (AREA)

Abstract

L'invention concerne un système de séparation de boîte froide de réfrigérant à composants multiples pour la déshydrogénation de propane présentant une fourniture de capacité de refroidissement stable et une faible consommation d'énergie globale du système, et un procédé de traitement. Le système de séparation de boîte froide de réfrigérant à composants multiples pour la déshydrogénation de propane comprend un échangeur de chaleur principal, un compresseur de réfrigérant à composants multiples, un séparateur de réfrigérant à composants multiples, un séparateur gaz-liquide de premier étage de gaz de réaction, un séparateur gaz-liquide de second étage de gaz de réaction, un séparateur de réfrigérant de pré-refroidissement, un séparateur de réfrigérant cryogénique, un réservoir tampon de produit liquide, une première canalisation, une deuxième canalisation, une troisième canalisation, une quatrième canalisation, une cinquième canalisation et une sixième canalisation ; un canal de pré-refroidissement de gaz de réaction, un canal cryogénique de gaz de réaction, un canal d'alimentation en propane, un canal de gazéification de propane, un canal de réfrigérant de pré-refroidissement, un canal de réfrigérant cryogénique, un canal de refoulement de réfrigérant à composants multiples, un canal de produit de gaz purifié, un canal de produit liquide et un canal de gaz d'évaporation flash étant tous agencés dans l'échangeur de chaleur principal. La présente invention surmonte le problème de consommation d'énergie globale excessive d'un système existant, des exigences de pureté élevée d'hydrogène d'un produit gazeux purifié et de taux de récupération élevé d'un produit de propylène sont satisfaites tout en réduisant la quantité d'hydrogène en circulation.
PCT/CN2022/112627 2022-02-28 2022-08-16 Système de séparation de boîte froide de réfrigérant à composants multiples pour la déshydrogénation de propane, et procédé de traitement WO2023159890A1 (fr)

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