CN217442093U - 一种带循环制冷系统的天然气乙烷回收装置 - Google Patents

一种带循环制冷系统的天然气乙烷回收装置 Download PDF

Info

Publication number
CN217442093U
CN217442093U CN202221587598.5U CN202221587598U CN217442093U CN 217442093 U CN217442093 U CN 217442093U CN 202221587598 U CN202221587598 U CN 202221587598U CN 217442093 U CN217442093 U CN 217442093U
Authority
CN
China
Prior art keywords
gas
demethanizer
natural gas
section
main
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202221587598.5U
Other languages
English (en)
Inventor
颜雪玲
朱江
戚炳桥
龚凯琪
罗强
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sichuan Corbic Oil & Gas Engineering Co ltd
Original Assignee
Sichuan Corbic Oil & Gas Engineering Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sichuan Corbic Oil & Gas Engineering Co ltd filed Critical Sichuan Corbic Oil & Gas Engineering Co ltd
Priority to CN202221587598.5U priority Critical patent/CN217442093U/zh
Application granted granted Critical
Publication of CN217442093U publication Critical patent/CN217442093U/zh
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/0204—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the feed stream
    • F25J3/0209—Natural gas or substitute 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
    • F25J1/0002—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
    • 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
    • F25J1/0228—Coupling of the liquefaction unit to other units or processes, so-called integrated processes
    • F25J1/0235—Heat exchange integration
    • F25J1/0237—Heat exchange integration integrating refrigeration provided for liquefaction and purification/treatment of the gas to be liquefied, e.g. heavy hydrocarbon removal from natural gas
    • F25J1/0239—Purification or treatment step being integrated between two refrigeration cycles of a refrigeration cascade, i.e. first cycle providing feed gas cooling and second cycle providing overhead gas cooling
    • F25J1/0241—Purification or treatment step being integrated between two refrigeration cycles of a refrigeration cascade, i.e. first cycle providing feed gas cooling and second cycle providing overhead gas cooling wherein the overhead cooling comprises providing reflux for a fractionation step
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
    • F25J1/0257—Construction and layout of liquefaction equipments, e.g. valves, machines
    • F25J1/0262—Details of the cold heat exchange system
    • 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
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/0228—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream
    • F25J3/0233—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream separation of CnHm with 1 carbon atom 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
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
    • F25J3/0228—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream
    • F25J3/0238—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream characterised by the separated product stream separation of CnHm with 2 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
    • F25J2200/00—Processes or apparatus using separation by rectification
    • F25J2200/02—Processes or apparatus using separation by rectification in a single pressure main column system
    • 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
    • F25J2200/00—Processes or apparatus using separation by rectification
    • F25J2200/40—Features relating to the provision of boil-up in the bottom of a column
    • 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
    • F25J2200/00—Processes or apparatus using separation by rectification
    • F25J2200/50—Processes or apparatus using separation by rectification using multiple (re-)boiler-condensers at different heights of the column
    • 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
    • F25J2200/00—Processes or apparatus using separation by rectification
    • F25J2200/72—Refluxing the column with at least a part of the totally condensed overhead 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
    • F25J2205/00—Processes or apparatus using other separation and/or other processing means
    • F25J2205/02—Processes or apparatus using other separation and/or other processing means using simple phase separation in a vessel or drum
    • F25J2205/04—Processes or apparatus using other separation and/or other processing means using simple phase separation in a vessel or drum in the feed line, i.e. upstream of the fractionation step
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2210/00—Processes characterised by the type or other details of the feed stream
    • F25J2210/06—Splitting of the feed stream, e.g. for treating or cooling in different ways
    • 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
    • F25J2215/00—Processes characterised by the type or other details of the product stream
    • F25J2215/04—Recovery of liquid products
    • 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
    • F25J2260/00—Coupling of processes or apparatus to other units; Integrated schemes
    • F25J2260/20—Integration in an installation for liquefying or solidifying a fluid 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
    • F25J2270/00—Refrigeration techniques used
    • F25J2270/12—External refrigeration with liquid vaporising 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
    • F25J2270/18—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
    • F25J2270/60—Closed external refrigeration cycle with single component refrigerant [SCR], e.g. C1-, C2- or C3-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
    • F25J2270/66—Closed external refrigeration cycle with multi component refrigerant [MCR], e.g. mixture of hydrocarbons

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Separation By Low-Temperature Treatments (AREA)

Abstract

本实用新型公开了一种带循环制冷系统的天然气乙烷回收装置，包括主冷箱、脱甲烷塔和低温分离器；所述主冷箱采用分段式供冷，包括原料气预冷段、冷凝气冷凝段和天然气液化段；所述低温分离器用于对经过原料气预冷段冷却后的天然气进行气液分离；分离后的气相进入冷凝气冷凝段冷却后进入脱甲烷塔，分离后的液相直接进入脱甲烷塔；所述脱甲烷塔用于脱除天然气中的乙烷，脱除乙烷的天然气通过产品管道进入主冷箱的天然气液化段进行液化处理获得LNG产品。本实用新型采用分段供冷来灵活适应原料气组分变化，不仅能实现乙烷回收同时联产LNG，且具有LNG产品性能好和效率高的优点。

Description

一种带循环制冷系统的天然气乙烷回收装置
技术领域
本实用新型涉及LNG制备技术领域，具体涉及一种带循环制冷系统的天然气乙烷回收装置。
背景技术
天然气中除含有主要组成甲烷外，通常还含有一定量的轻烃，如乙烷、丙烷等。而乙烯作为石化工业最基础原料之一，采用乙烷制乙烯的工艺，具有高收率、低能耗等特点。同时，天然气中乙烷含量过高，会导致车辆混合气燃烧得比较慢，进而造成动力性能下降严重使车辆产生抖动的情况。
因此将天然气中乙烷回收，既有利于液化天然气产品性能的稳定，同时回收的乙烷也具有较大的经济效益。
实用新型内容
本实用新型的目的在于提供一种带循环制冷系统的天然气乙烷回收装置，采用分段供冷来灵活适应原料气组分变化，不仅能实现乙烷回收同时联产LNG，且具有效率高的优点。
本实用新型通过下述技术方案实现：
一种带循环制冷系统的天然气乙烷回收装置，包括主冷箱、脱甲烷塔和低温分离器；
所述主冷箱采用分段式供冷，包括原料气预冷段、冷凝气冷凝段和天然气液化段；
所述低温分离器用于对经过原料气预冷段冷却后的天然气进行气液分离；分离后的气相进入冷凝气冷凝段冷却后进入脱甲烷塔，分离后的液相直接进入脱甲烷塔；
所述脱甲烷塔用于脱除天然气中的乙烷，脱除乙烷的天然气通过产品管道进入主冷箱的天然气液化段进行液化处理获得LNG产品。
本实用新型所述脱甲烷塔和低温分离器均采用现有技术，采用主冷箱进行制冷在LNG制备领域是常用的，但是，本实用新型充分考虑了原料天然气、原料天然气进行气液分离后的气相，以及经过脱甲烷塔脱除乙烷的天然气的组分变化，将主冷箱采用分段式供冷，能通过分段供冷来灵活适应原料气组分变化，能够实现脱甲烷塔中脱除乙烷的效果更好，利于提高LNG产品性能和利于乙烷回收，实现乙烷回收同时联产LNG，且具有LNG产品性能好和效率高的优点
进一步地，还包括脱甲烷塔重沸器；
所述脱甲烷塔重沸器通过进气管与原料进管的载入段连接，所述脱甲烷塔重沸器通过出气管与原料进管的冷却段连接。
所述原料进管的载入段具体是指原料气进入主冷箱之前的管段，原料进管的冷却段具体是指原料气进入主冷箱之后的管段。
进一步地，脱甲烷塔重沸器通过管道与脱甲烷塔形成循环回路，实现脱甲烷塔重沸器对原料预冷的热量为脱甲烷塔提供热量。
进一步地，脱甲烷塔重沸器设置在甲烷塔底部外侧，通过管道与脱甲烷塔底部形成循环回路。
进一步地，脱甲烷塔的中部设置有循环管道，循环管道两端均与脱甲烷塔中部连接，所述循环管道用于抽取脱甲烷塔中部的液体进入主冷箱内复热后回到脱甲烷塔。
进一步地，产品管道位于主冷箱内的部分通过回流管道与脱甲烷塔连接。
进一步地，产品管道内的天然气在主冷箱内冷凝后通过回流管道回流至脱甲烷塔顶部。
进一步地，还包括第一压缩机和第二压缩机；
所述第一压缩机与主冷箱之间形成丙烷制冷循环，所述第二压缩机与主冷箱之间形成混合冷剂制冷循环，通过丙烷制冷循环和混合冷剂制冷循环实现主冷箱的阶式供冷。
进一步地，经过第一压缩机压缩制冷的丙烷进入主冷箱的原料气预冷段供冷，然后出主冷箱经过丙烷节流阀节流降压后返回主冷箱的为原料气预冷段提供冷量，然后出主冷箱返回至第一压缩机入口，再次压缩而循环制冷。
本实用新型的混合冷剂采用任意现有技术即可，所示混合冷剂组成为氮气、甲烷、乙烯、丙烷、丁烷、戊烷中的多种。
进一步地，还包括混合冷剂气液分离器；
所述第二压缩机向主冷箱的原料气预冷段提供压缩制冷后的混合冷剂；
所述混合冷剂气液分离器用于分离出经原料气预冷段预冷后的混合冷剂中由于降温而冷凝的液体，分离后的液体冷却剂进入主冷箱的冷凝气冷凝段冷凝后，出主冷箱经过液相冷剂节流阀节流降压后返回主冷箱提供冷量；分离后的气体冷却剂进入主冷箱依次进入冷凝气冷凝段和天然气液化段冷凝后，出主冷箱经过液相气相冷剂节流阀节流降压后返回主冷箱的天然气液化段提供冷量，然后与液体冷却剂在冷凝气冷凝段汇合后依次经过冷凝气冷凝段、原料气预冷段出主冷箱返回第二压缩机的入口，再次压缩而循环制冷。
采用上述设置的丙烷制冷循环和混合冷剂制冷循环，不仅能够实现主冷箱采用分段式供冷(原料气预冷段、冷凝气冷凝段和天然气液化段)，且具有流程简练、效率高、运行费用抵、适应性强等优点。
本实用新型与现有技术相比，具有如下的优点和有益效果：
1、本实用新型将主冷箱采用分段式供冷，能通过分段供冷来灵活适应原料气组分变化，不仅能实现乙烷回收同时联产LNG，且具有LNG产品性能好和效率高的优点。
2、本实用新型的脱甲烷塔底重沸器能够用于对原料气进行预冷，且脱甲烷塔底部与脱甲烷塔底重沸器形成循环回路，用于对原料气预冷同时为脱甲烷塔底提供热量，采用原料气作为脱乙烷塔底热源，具有降低能耗的优点。
附图说明
此处所说明的附图用来提供对本实用新型实施例的进一步理解，构成本申请的一部分，并不构成对本实用新型实施例的限定。在附图中：
图1为本实用新型天然气乙烷回收并联产LNG装置的示意图。
附图中标记及对应的零部件名称：
1-主冷箱，2-脱甲烷塔重沸器，3-脱甲烷塔，4-混合冷剂气液分离器，5-低温分离器，6-液相冷剂节流阀，7-气相冷剂节流阀，8-丙烷节流阀，9-第一压缩机，10-第二压缩机，11-原料进管，12-产品，13-回流管道，14-循环管道。
具体实施方式
为使本实用新型的目的、技术方案和优点更加清楚明白，下面结合实施例和附图，对本实用新型作进一步的详细说明，本实用新型的示意性实施方式及其说明仅用于解释本实用新型，并不作为对本实用新型的限定。
实施例1：
如图1所示，一种带循环制冷系统的天然气乙烷回收装置，包括主冷箱1、脱甲烷塔3、低温分离器5、混合冷剂气液分离器4、第一压缩机9和第二压缩机10；
主冷箱1采用分段式供冷，包括原料气预冷段、冷凝气冷凝段和天然气液化段，如图1所示，主冷箱1内与低温分离器5相对应的管道区域为冷凝气冷凝段，冷凝气冷凝段以上和以下分别为原料气预冷段和天然气液化段；
第一压缩机9与主冷箱1之间形成丙烷制冷循环，第二压缩机10与主冷箱1之间形成混合冷剂制冷循环，通过丙烷制冷循环和混合冷剂制冷循环实现主冷箱1的分段式供冷。
经过第一压缩机9压缩制冷的丙烷进入主冷箱1的原料气预冷段供冷，然后出主冷箱1经过丙烷节流阀8节流降压后返回主冷箱1的为原料气预冷段提供冷量，然后出主冷箱1返回至第一压缩机9入口，再次压缩而循环制冷。
第二压缩机10向主冷箱1的原料气预冷段提供压缩制冷后的混合冷剂；
混合冷剂气液分离器4用于分离出经原料气预冷段预冷后的混合冷剂中由于降温而冷凝的液体，分离后的液体冷却剂进入主冷箱1的冷凝气冷凝段冷凝后，出主冷箱1经过液相冷剂节流阀6节流降压后返回主冷箱1提供冷量；分离后的气体冷却剂进入主冷箱1依次进入冷凝气冷凝段和天然气液化段冷凝后，出主冷箱1经过液相气相冷剂节流阀7节流降压后返回主冷箱1的天然气液化段提供冷量，然后与液体冷却剂在冷凝气冷凝段汇合后依次经过冷凝气冷凝段、原料气预冷段出主冷箱1返回第二压缩机10的入口，再次压缩而循环制冷。
低温分离器5设置在主冷箱1外侧，用于对经过原料气预冷段冷却后的天然气进行气液分离；分离后的气相进入冷凝气冷凝段冷却后进入脱甲烷塔3，分离后的液相直接进入脱甲烷塔3；
如图1所示，原料进管11载入段的原料天然气进入主冷箱1内的原料气预冷段供冷进行冷却至-60℃左右后，然后出主冷箱1进入低温分离器5进行气液分离，低温分离器5分离后的液相进入脱甲烷塔3的中上部，分离后气相则返回主冷箱1进一步冷却至-100℃左右，然后出主冷箱1后进入脱甲烷塔3的上部，即经过低温分离器5分离后的气相经过冷却后进入脱甲烷塔3的位置高于离后的液相进入脱甲烷塔3的位置。
脱甲烷塔3用于脱除天然气中的乙烷，脱除乙烷的天然气通过产品管道12进入主冷箱1的天然气液化段进行液化处理获得LNG产品；
如图1所示，从脱甲烷塔3顶出来的天然气进入主冷箱1，冷凝至-162℃，作为LNG产品。脱甲烷塔3塔底凝液则进入下一工序进行乙烷分离。
实施例2：
如图1所示，本实施例基于实施例1，还包括脱甲烷塔重沸器2；
脱甲烷塔重沸器2通过进气管与原料进管11的载入段连接，脱甲烷塔重沸器2通过出气管与原料进管11的冷却段连接；即原料天然气分为两路，一路直接主冷箱1进入经过原料气预冷段冷却，一路进入脱甲烷塔重沸器2预冷后进入主冷箱1与另一路原料天然气混合。
在本实施例中，为了降低能耗，将脱甲烷塔底重沸器2，用于对原料气预冷同时为脱甲烷塔3底提供热量，即脱甲烷塔重沸器2通过管道与脱甲烷塔3形成循环回路，作为优选地，脱甲烷塔重沸器2设置在甲烷塔3底部外侧，通过管道与脱甲烷塔3底部形成循环回路。
在本实施例中，脱甲烷塔3的中部设置有循环管道14，循环管道14两端均与脱甲烷塔3中部连接，所述循环管道14用于抽取脱甲烷塔3中部的液体进入主冷箱1内复热后回到脱甲烷塔3，即在脱甲烷塔3的中部设置有液相侧抽线，抽出温度约-75℃进入主冷箱1复热至约-50℃后返回脱甲烷塔3。
在本实施例中，产品管道12位于主冷箱1内的部分通过回流管道13与脱甲烷塔3连接，产品管道12内的天然气在主冷箱1内冷凝后通过回流管道13回流至脱甲烷塔3顶部。
在本实施例中，来自上游单元的原料气，分为两股，一股先去脱甲烷塔重沸器2，与脱甲烷塔3底物料换热预冷后，返回主冷箱1与另一股原料气汇合。原料气被预冷至-60℃左右后，进入低温分离器5进行气液分离，低温分离器5的液相进入脱甲烷塔3的中上部，气相则返回主冷箱1进一步冷却至-100℃左右，然后出主冷箱1后进入脱甲烷塔3上部。同时从脱甲烷塔3中部设置液相侧抽线，抽出温度约-75℃进入主冷箱1复热至约-50℃后返回脱甲烷塔3。脱甲烷塔3底设置脱甲烷塔底重沸器2，用于对原料气预冷同时为脱甲烷塔3底部提供热量。从脱甲烷塔3顶出来的天然气进入主冷箱1，冷凝至约-115℃后，分为两股，一股返回脱甲烷塔3顶作为回流继续传质传热，另一股则在主冷箱1中继续冷凝冷却至-162℃，作为LNG产品。脱甲烷塔3塔底凝液则进入下一工序进行乙烷分离。
即在本实施例中，通过脱甲烷塔重沸器2为脱甲烷塔3底部供热，以及液相侧抽线回流、液相冷却剂回流、气相冷却剂回流和脱甲烷塔3顶出来的天然气冷凝回流实现了脱甲烷塔3内不同高度的温差。
以上所述的具体实施方式，对本实用新型的目的、技术方案和有益效果进行了进一步详细说明，所应理解的是，以上所述仅为本实用新型的具体实施方式而已，并不用于限定本实用新型的保护范围，凡在本实用新型的精神和原则之内，所做的任何修改、等同替换、改进等，均应包含在本实用新型的保护范围之内。
需要注意的是，本说明书所附图式所绘示的结构、比例、大小等，均仅用以配合说明书所揭示的内容，以供熟悉此技术的人士了解与阅读，并非用以限定本实用新型可实施的限定条件，故不具技术上的实质意义，任何结构的修饰、比例关系的改变或大小的调整，在不影响本实用新型所能产生的功效及所能达成的目的下，均应仍落在本实用新型所揭示的技术内容得能涵盖的范围内。同时，本说明书中所引用的如“上”、“下”、“左”、“右”、“中间”等的用语，亦仅为便于叙述的明了，而非用以限定本实用新型可实施的范围，其相对关系的改变或调整，在无实质变更技术内容下，当亦视为本实用新型可实施的范畴。

Claims (10)

1.一种带循环制冷系统的天然气乙烷回收装置，其特征在于，包括主冷箱(1)、脱甲烷塔(3)和低温分离器(5)；
所述主冷箱(1)采用分段式供冷，包括原料气预冷段、冷凝气冷凝段和天然气液化段；
所述低温分离器(5)用于对经过原料气预冷段冷却后的天然气进行气液分离；分离后的气相进入冷凝气冷凝段冷却后进入脱甲烷塔(3)，分离后的液相直接进入脱甲烷塔(3)；
所述脱甲烷塔(3)用于脱除天然气中的乙烷，脱除乙烷的天然气通过产品管道(12)进入主冷箱(1)的天然气液化段进行液化处理获得LNG产品。
2.根据权利要求1所述的一种带循环制冷系统的天然气乙烷回收装置，其特征在于，还包括脱甲烷塔重沸器(2)；
所述脱甲烷塔重沸器(2)通过进气管与原料进管(11)的载入段连接，所述脱甲烷塔重沸器(2)通过出气管与原料进管(11)的冷却段连接。
3.根据权利要求2所述的一种带循环制冷系统的天然气乙烷回收装置，其特征在于，所述脱甲烷塔重沸器(2)通过管道与脱甲烷塔(3)形成循环回路。
4.根据权利要求3所述的一种带循环制冷系统的天然气乙烷回收装置，其特征在于，所述脱甲烷塔重沸器(2)设置在甲烷塔(3)底部外侧，通过管道与脱甲烷塔(3)底部形成循环回路。
5.根据权利要求1所述的一种带循环制冷系统的天然气乙烷回收装置，其特征在于，所述脱甲烷塔(3)的中部设置有循环管道(14)，循环管道(14)两端均与脱甲烷塔(3)中部连接，所述循环管道(14)用于抽取脱甲烷塔(3)中部的液体进入主冷箱(1)内复热后回到脱甲烷塔(3)。
6.根据权利要求1所述的一种带循环制冷系统的天然气乙烷回收装置，其特征在于，所述产品管道(12)位于主冷箱(1)内的部分通过回流管道(13)与脱甲烷塔(3)连接。
7.根据权利要求6所述的一种带循环制冷系统的天然气乙烷回收装置，其特征在于，产品管道(12)内的天然气在主冷箱(1)内冷凝后通过回流管道(13)回流至脱甲烷塔(3)顶部。
8.根据权利要求1所述的一种带循环制冷系统的天然气乙烷回收装置，其特征在于，还包括第一压缩机(9)和第二压缩机(10)；
所述第一压缩机(9)与主冷箱(1)之间形成丙烷制冷循环，所述第二压缩机(10)与主冷箱(1)之间形成混合冷剂制冷循环，通过丙烷制冷循环和混合冷剂制冷循环实现主冷箱(1)的阶式供冷。
9.根据权利要求8所述的一种带循环制冷系统的天然气乙烷回收装置，其特征在于，经过第一压缩机(9)压缩制冷的丙烷进入主冷箱(1)的原料气预冷段供冷，然后出主冷箱(1)经过丙烷节流阀(8)节流降压后返回主冷箱(1)的为原料气预冷段提供冷量，然后出主冷箱(1)返回至第一压缩机(9)入口，再次压缩而循环制冷。
10.根据权利要求8所述的一种带循环制冷系统的天然气乙烷回收装置，其特征在于，还包括混合冷剂气液分离器(4)；
所述第二压缩机(10)向主冷箱(1)的原料气预冷段提供压缩制冷后的混合冷剂；
所述混合冷剂气液分离器(4)用于分离出经原料气预冷段预冷后的混合冷剂中由于降温而冷凝的液体，分离后的液体冷却剂进入主冷箱(1)的冷凝气冷凝段冷凝后，出主冷箱(1)经过液相冷剂节流阀(6)节流降压后返回主冷箱(1)提供冷量；分离后的气体冷却剂进入主冷箱(1)依次进入冷凝气冷凝段和天然气液化段冷凝后，出主冷箱(1)经过液相气相冷剂节流阀(7)节流降压后返回主冷箱(1)的天然气液化段提供冷量，然后与液体冷却剂在冷凝气冷凝段汇合后依次经过冷凝气冷凝段、原料气预冷段出主冷箱(1)返回第二压缩机(10)的入口，再次压缩而循环制冷。
CN202221587598.5U 2022-06-23 2022-06-23 一种带循环制冷系统的天然气乙烷回收装置 Active CN217442093U (zh)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202221587598.5U CN217442093U (zh) 2022-06-23 2022-06-23 一种带循环制冷系统的天然气乙烷回收装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202221587598.5U CN217442093U (zh) 2022-06-23 2022-06-23 一种带循环制冷系统的天然气乙烷回收装置

Publications (1)

Publication Number Publication Date
CN217442093U true CN217442093U (zh) 2022-09-16

Family

ID=83224975

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202221587598.5U Active CN217442093U (zh) 2022-06-23 2022-06-23 一种带循环制冷系统的天然气乙烷回收装置

Country Status (1)

Country Link
CN (1) CN217442093U (zh)

Similar Documents

Publication Publication Date Title
US7086251B2 (en) Integrated multiple-loop refrigeration process for gas liquefaction
US7308805B2 (en) Integrated multiple-loop refrigeration process for gas liquefaction
US5600969A (en) Process and apparatus to produce a small scale LNG stream from an existing NGL expander plant demethanizer
CN100417903C (zh) 低温天然气加工设施中用于液化天然气的方法和设备
RU2668303C1 (ru) Система и способ для сжижения природного газа (варианты)
US10539363B2 (en) Method and apparatus for cooling a hydrocarbon stream
CN101392983B (zh) 一种液化富甲烷气的过程
CN104513680B (zh) 富甲烷气精馏脱氢氮并生产液化天然气的工艺和装置
CN105486034A (zh) 一种天然气液化与轻烃分离一体化集成工艺系统及工艺
CN213514662U (zh) 一种小型火炬气制lng脱重烃装置
CN217442093U (zh) 一种带循环制冷系统的天然气乙烷回收装置
CN114440551B (zh) 富含氮气的油田伴生气混烃回收及干气低温液化装置及方法
CN101392982B (zh) 一种液化富甲烷气的工艺流程
CN208419376U (zh) 一种混合冷剂制冷液化天然气的装置
CN115371355B (zh) 一种适用于标准模块化的天然气液化系统及方法
CN115046366A (zh) 一种回收天然气中乙烷的处理工艺
US11604025B2 (en) Standalone high-pressure heavies removal unit for LNG processing
CN108955085A (zh) 一种小型撬装式煤层气液化系统和方法
CN216688027U (zh) 一种富含氮气的油田伴生气混烃回收及干气低温液化装置
CN116772515A (zh) 一种天然气液化脱氮工艺及装置
CA2273003C (en) Process and apparatus to produce lng
CN116086131A (zh) 一种冷冻盐水预冷的混合冷剂液化天然气装置及其方法

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant