CN103868324B - 小型撬装式混合制冷剂天然气液化和ngl回收一体*** - Google Patents

小型撬装式混合制冷剂天然气液化和ngl回收一体*** Download PDF

Info

Publication number
CN103868324B
CN103868324B CN201410083220.5A CN201410083220A CN103868324B CN 103868324 B CN103868324 B CN 103868324B CN 201410083220 A CN201410083220 A CN 201410083220A CN 103868324 B CN103868324 B CN 103868324B
Authority
CN
China
Prior art keywords
heat exchanger
level
natural gas
gas
order
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
CN201410083220.5A
Other languages
English (en)
Other versions
CN103868324A (zh
Inventor
巨永林
贺天彪
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.)
Ke Lin en New Energy Technology (Jiangsu) Co., Ltd.
Original Assignee
Shanghai Jiaotong University
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 Shanghai Jiaotong University filed Critical Shanghai Jiaotong University
Priority to CN201410083220.5A priority Critical patent/CN103868324B/zh
Publication of CN103868324A publication Critical patent/CN103868324A/zh
Application granted granted Critical
Publication of CN103868324B publication Critical patent/CN103868324B/zh
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • 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
    • F25J1/0032—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 the feed stream itself or separated fractions from it, i.e. "internal refrigeration"
    • F25J1/0045—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 the feed stream itself or separated fractions from it, i.e. "internal refrigeration" by vaporising a liquid return 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
    • F25J1/02—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
    • F25J1/0212—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 single flow MCR 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
    • F25J1/0238—Purification or treatment step is integrated within one refrigeration cycle only, i.e. the same or single refrigeration cycle provides feed gas cooling (if present) and overhead gas cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
    • F25J1/0279—Compression of refrigerant or internal recycle fluid, e.g. kind of compressor, accumulator, suction drum etc.
    • F25J1/0291—Refrigerant compression by combined gas compression and liquid pumping
    • 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
    • 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
    • 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
    • F25J3/0242—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 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
    • 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
    • F25J3/0247—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 4 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
    • 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
    • F25J3/0257—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 nitrogen
    • 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
    • F25J2200/08—Processes or apparatus using separation by rectification in a triple 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
    • 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
    • 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
    • F25J2215/00—Processes characterised by the type or other details of the product stream
    • F25J2215/62—Ethane or ethylene
    • 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
    • F25J2220/00—Processes or apparatus involving steps for the removal of impurities
    • F25J2220/60—Separating impurities from natural gas, e.g. mercury, cyclic hydrocarbons
    • F25J2220/62—Separating low boiling components, e.g. He, H2, N2, Air
    • 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
    • F25J2220/00—Processes or apparatus involving steps for the removal of impurities
    • F25J2220/60—Separating impurities from natural gas, e.g. mercury, cyclic hydrocarbons
    • F25J2220/64—Separating heavy hydrocarbons, e.g. NGL, LPG, C4+ hydrocarbons or heavy condensates in general
    • 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
    • F25J2245/00—Processes or apparatus involving steps for recycling of process streams
    • F25J2245/02—Recycle of a stream in general, e.g. a by-pass 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
    • F25J2270/18—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
    • F25J2290/00—Other details not covered by groups F25J2200/00 - F25J2280/00
    • F25J2290/34—Details about subcooling of liquids

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

本发明公开了一种小型撬装式混合制冷剂天然气液化和NGL回收一体***；该***由天然气液化模块、混合制冷剂循环模块和NGL回收模块组成。天然气液化模块包括依次相连的液化冷箱撬块、低温精馏撬块和天然气存储撬块；混合制冷剂循环模块包括混合制冷剂压缩撬块、第二级气液分离器、第二级混合器、第一级制冷剂节流装置、第二级制冷剂节流装置；NGL回收模块包括脱甲烷塔、脱乙烷塔和液化气塔。本发明的小型撬装式混合制冷剂天然气液化和NGL回收一体流程简单，启动快，维护方便，便于设备成撬，能耗较低，同时对不同气源有较强的适应性。

Description

小型撬装式混合制冷剂天然气液化和NGL回收一体***
技术领域
本发明属于化工与低温工程技术领域，具体涉及一种小型撬装式混合制冷剂天然气液化和NGL回收一体***。
背景技术
天然气与石油、煤炭作为世界上主要的化石能源，在一次能源中占有很大的比率。天然气作为一种优质清洁能源，越来越多的国家开始重视天然气资源的开发和利用。
随着我国能源结构的不断优化和天然气消费需求的不断增长，加之我国绝大多数天然气田储量都不大的现状，我国天然气供需缺口在不断加大。据预测，到2020年我国天然气的供应缺口将达1000×108m3。
另一方面，我国存在大量产储量较小的边际气田、伴生气田、煤层气田，单井储量较小，距离供气管网较远，采用管输方法由于经济上不合理而没有得到有效开发利用，长期以来被点火炬放空。小型撬装式天然气液化装置可以有效利用这些天然气资源，通过技术拓展，小型撬装式天然气液化装置同样适合于生物燃气(包括城市垃圾填埋气)提纯与液化、海上含油田伴生气、部分焦炉煤气液化、煤层天然气(瓦斯)、页岩气开发利用等，市场前景十分广阔。NGL回收流程可以提高液化工厂的经济效益，因此液化天然气流程结合NGL回收流程将大大提高小型撬装式天然气装置的经济效益。
发明内容
本发明的目的在于克服上述现有技术存在的不足，提供一种小型撬装式混合制冷剂天然气液化和NGL回收一体***。该小型撬装式混合制冷剂天然气液化和NGL回收一体流程具有方法简单，启动快操作与维护方便，便于设备成撬。
本发明的目的是通过以下技术方案来实现：
本发明涉及一种小型撬装式混合制冷剂天然气液化和NGL回收一体***，所述***包括天然气液化模块、混合制冷剂循环模块和NGL回收模块；所述天然气液化模块包括依次相连的液化冷箱撬块、低温精馏撬块和天然气存储撬块，所述液化冷箱撬块包括与三相分离器11进口端相连的第一级换热器10以及依次相连的第二级换热器14、第三级换热器19、第四级换热器21和天然气节流装置23，所述第二级换热器14与三相分离器11气相出口端相连；所述混合制冷剂循环模块为由混合制冷剂压缩撬块、第二级气液分离器9、并列设置的气、液相制冷剂支路、第二级混合器17、第二级换热器14以及第一级换热器13构成的循环回路，所述液相制冷剂支路由第二级气液分离器9液相出口端、第一、二级换热器10、14、第一级制冷剂节流装置16连接而成，所述气相制冷剂支路由第二级气液分离器9气相出口端、第一、二、三、四级换热器10、14、19、21、第二级制冷剂节流装置22、第四级换热器21、第三换热器19连接而成；所述NGL回收模块包括NGL节流装置12、脱甲烷塔13、乙烷节流装置15、脱乙烷塔18和液化气塔20，所述NGL节流装置12的进口端与三相分离器11液相出口端相连，所述脱甲烷塔13进口端经第一级换热器10与NGL节流装置12的出口端相连，所述脱甲烷塔13的气相出口端依次经第四级换热器21、富甲烷气体节流装置24与低温精馏撬块相连，所述脱甲烷塔13的液相出口端与脱乙烷塔18的进口端、脱乙烷塔18的液相出口端、液化气塔20依次相连，所述脱乙烷塔18的气相出口端经乙烷节流装置15与第一级换热器10相连。
优选地，所述低温精馏撬块为低温精馏塔25，所述低温精馏塔25的塔底出口与天然气存储撬块相连，所述低温精馏塔25的塔顶出口与第四级换热器21、第三级换热器19、第二级换热器14和第一级换热器10依次相连。
优选地，所述NGL节流装置12、乙烷节流装置15、第一级制冷剂节流装置16、第二级制冷剂节流装置22和天然气节流装置23为节流阀或液体膨胀机。
优选地，所述混合制冷剂压缩撬块包括第一级制冷剂压缩机1、第一级制冷剂冷却器2、第一级气液分离器3、第二级制冷剂压缩机4、第二级制冷剂冷却器5、制冷剂泵6、泵冷却器7和第一级混合器8，所述第一级制冷剂压缩机1、第一级制冷剂冷却器2、第一级气液分离器3的进口依次相连，所述第一级气液分离器3的气相出口与第二级制冷剂压缩机4、第二级制冷剂冷却器5依次相连，所述第一级气液分离器3的液相出口与制冷剂泵6、泵冷却器7相连，所述第一级混合器8的进口分别与第二级制冷剂冷却器5、泵冷却器7相连。
优选地，所述***还包括制冷剂储存及配比单元、仪控单元、仪表风及PSA制氮撬块。
优选地，所述***还包括稳定轻烃储存撬块和LPG储存撬块；所述稳定轻烃储存撬块与液化气塔20液相出口端相连，所述LPG储存撬块与液化气塔20气相出口端相连。
优选地，所述***还包括发电机撬块、液氮应急供应单元中的一种或几种。当气源地没有供电***时，由所述发电机撬块为液化流程提供电能；液氮应急供应单元是作为应急使用的。
本发明还涉及一种前述的一种小型撬装式混合制冷剂天然气液化和NGL回收一体***的应用方法，包括如下步骤：
A、原料天然气经第一级换热器10冷却后进入三相分离器11，三相分离器11顶部出来的气相继续经第二级换热器14、第三级换热器19和第四级换热器21冷却液化；
B、经所述步骤A冷却液化后的天然气进入低温精馏撬块，经所述天然气节流装置23节流降温后进入低温精馏塔25，低温精馏塔25底部的液化天然气进入第四级换热器21过冷后进入天然气储存撬块；低温精馏塔25顶部的闪蒸气依次返回所述第四级换热器21、第三级换热器19、第二级换热器14和第一级换热器10提供冷量；
C、经所述中三相分离器11中部得到的液相经NGL节流装置12降压后从第一级换热器10返流提供冷量，随后进入脱甲烷塔13脱除甲烷，脱甲烷塔13顶部的富甲烷气体经第四级换热器21冷却后，通过富甲烷气体节流装置24降压，进入低温精馏塔25；脱甲烷塔13底部的液相进入脱乙烷塔18脱除乙烷，脱乙烷塔18顶部的乙烷气体经乙烷节流装置15降压后为第一级换热器10提供冷量，脱乙烷塔18底部的液体进入液化气塔20，从液化气塔20顶部获得LPG，底部获得稳定轻烃；
D、混合制冷剂原料经所述混合制冷剂压缩撬块增压、冷却后进入第二级气液分离器9进行气液分离；分离出的气相混合制冷剂经第一级换热器10、第二级换热器14、第三级换热器19和第四级换热器21冷却后经第二级制冷剂节流阀22节流降温，为第四级换热器21和第三级换热器19提供冷量；分离出的液相混合制冷剂经第一级换热器10和第二级换热器14预冷后经第一级制冷剂节流阀16节流降温，与从所述第四级换热器21和第三级换热器19提供冷量后出来的混合制冷剂混合后为第二级换热器14和第一级换热器10提供冷量，从所述第一级换热器10提供冷量后出来的混合制冷剂返回混合制冷剂压缩撬块完成制冷循环。
优选地，步骤B中，所述液化天然气储存压力为0.40MPa。
优选地，步骤B中，所述液化天然气需过冷2℃以上。
本发明***的工作原理为：天然气经预处理后经第一级换热器降温冷却进入三相分离器，从底部脱除残余杂质，从三相分离器顶部得到的气相经第二、三、四级换热器冷却后液化，通过节流阀降压至液化天然气存储压力后进入低温精馏塔脱除氮气，从塔底获得液化天然气后返回第四级换热器过冷，塔顶闪蒸气返回换热器提供冷量；三相分离器中部获得的液相先经过节流阀节流至脱甲烷塔工作压力，然后为第一级换热器提供冷量后进入脱甲烷塔，脱甲烷塔顶的富甲烷气体经第四级换热器冷却后节流降压进入低温精馏塔，脱甲烷塔底部的液体进入脱乙烷塔，从脱乙烷塔顶部获得的富乙烷气体节流至原料气压缩机入口压力后为第一级换热器提供冷量后返回原料气压缩机循环，脱乙烷塔底部液体进入液化气塔，从塔底获得稳定轻烃，塔顶获得LPG；混合制冷剂经混合制冷剂压缩撬块增压、冷却，进入第二级气液分离器，气相制冷剂经四级换热器冷却后节流降温为第二级换热器提供冷量，液相制冷剂经两级换热器冷却后通过节流阀节流降温后与从第三级换热器出来的制冷剂混合后为第一、二级换热器提供冷量。
与现有技术相比，本发明具有的有益效果如下：
1、本发明所述的一种小型撬装式混合制冷剂天然气液化和NGL回收一体工艺，有效地把天然气液化工艺和NGL回收工艺结合在一起，整体能耗较低，设备方便成撬。
2、通过油气行业广泛采用的HYSYS软件的模拟计算，证实本工艺能耗较低，对不同气源适应性较强。
附图说明
通过阅读参照以下附图对非限制性实施例所作的详细描述，本发明的其它特征、目的和优点将会变得更明显：
图1为小型撬装式混合制冷剂天然气液化和NGL回收一体工艺流程图；
其中，1为第一级制冷剂压缩机、2为第一级制冷剂冷却器、3为第一级气液分离器、4为第二级制冷剂压缩机、5为第二级制冷剂冷却器、6为制冷剂泵、7为泵冷却器、8为第一级混合器、9为第二级气液分离器、10为第一级换热器、11为三相分离器、12为NGL节流装置、13为脱甲烷塔、14为第二级换热器、15为乙烷节流装置、16为第一级制冷剂节流阀、17为第二级混合器、18为脱乙烷塔、19为第三级换热器、20为液化气塔、21为第四级换热器、22为第二级制冷剂节流阀、23为天然气节流装置、24为富甲烷气体节流装置、25为低温精馏塔。
具体实施方式
下面结合附图及具体实施例对本发明进行详细说明。以下实施例将有助于本领域的技术人员进一步理解本发明，但不以任何形式限制本发明。应当指出的是，对本领域的普通技术人员来说，在不脱离本发明构思的前提下，还可以做出若干变形和改进。这些都属于本发明的保护范围。
本发明的小型撬装式混合制冷剂天然气液化和NGL回收一体***及其工艺流程如图1所示，该***包括天然气液化模块、混合制冷剂循环模块和NGL回收模块。
所述天然气液化模块包括依次相连的液化冷箱撬块、低温精馏撬块和天然气存储撬块，所述液化冷箱撬块包括与三相分离器11进口端相连的第一级换热器10以及依次相连的第二级换热器14、第三级换热器19、第四级换热器21和天然气节流装置23，所述第二级换热器14与三相分离器11气相出口端相连；所述低温精馏撬块为低温精馏塔25；所述低温精馏塔25的塔底出口与天然气存储撬块相连，所述低温精馏塔25的塔顶出口与第四级换热器21、第三级换热器19、第二级换热器14和第一级换热器10依次相连。
所述混合制冷剂循环模块为由混合制冷剂压缩撬块、第二级气液分离器9、并列设置的气、液相制冷剂支路、第二级混合器17以及制冷剂回流支路构成的循环回路，所述液相制冷剂支路由第二级气液分离器9液相出口端、第一、二级换热器10、14、第一级制冷剂节流装置16连接而成，所述气相制冷剂支路由第二级气液分离器9气相出口端、第一、二、三、四级换热器10、14、19、21、第二级制冷剂节流装置22、第四级换热器21、第三换热器19连接而成；所述混合制冷剂压缩撬块包括第一级制冷剂压缩机1、第一级制冷剂冷却器2、第一级气液分离器3、第二级制冷剂压缩机4、第二级制冷剂冷却器5、制冷剂泵6、泵冷却器7和第一级混合器8，所述第一级制冷剂压缩机1、第一级制冷剂冷却器2、第一级气液分离器3的进口依次相连，所述第一级气液分离器3的气相出口与第二级制冷剂压缩机4、第二级制冷剂冷却器5依次相连，所述第一级气液分离器3的液相出口与制冷剂泵6、泵冷却器7相连，所述第一级混合器8的进口分别与第二级制冷剂冷却器5、泵冷却器7相连。
所述NGL回收模块包括NGL节流装置12、脱甲烷塔13、乙烷节流装置15、脱乙烷塔18和液化气塔20，所述NGL节流装置12的进口端与三相分离器11液相出口端相连，所述脱甲烷塔13进口端经第一级换热器10与NGL节流装置12的出口端相连，所述脱甲烷塔13的气相出口端依次经第四级换热器21、富甲烷气体节流装置24与低温精馏撬块相连，所述脱甲烷塔13的液相出口端与脱乙烷塔18的进口端、脱乙烷塔18的液相出口端、液化气塔20依次相连，所述脱乙烷塔18的气相出口端经乙烷节流装置15与第一级换热器10相连。
应用本发明的小型撬装式混合制冷剂天然气液化和NGL回收一体***的方法具体见以下各实施例：
实施例1
天然气摩尔组分67.21％CH4+14.23％C2H6+9.36％C3H8+2.79％i-C4H10+3.32％n-C4H10+0.07％i-C5H12+0.06％n-C5H12+0.04C6H14+2.92％N2、压力5.04MPa、温度40℃、流量83.92kmol／h，小型撬装式混合制冷剂天然气液化和NGL回收一体工艺的具体步骤如下：
1、原料天然气第一级换热器10冷却至-10℃后进入三相分离器11，三相分离器11顶部出来的气相继续经第二级换热器14、第三级换热器19和第四级换热器21冷却至-160℃后液化；
2、经步骤1冷却液化后的天然气进入低温精馏撬块，经所述天然气节流装置23节流至450kPa后进入低温精馏塔25；
3、经步骤2中低温精馏塔25底部获得的液化天然气进入第四级换热器21过冷至-150℃后进入天然气储存撬块；低温精馏塔25顶部的闪蒸气依次返回第四级换热器21、第三级换热器19、第二级换热器14和第一级换热器10提供冷量；
4、经步骤1中三相分离器11中部得到的液相经NGL节流装置12降压至1.31MPa后从第一级换热器10返流提供冷量，自身温度上升至25℃，随后进入脱甲烷塔13脱除甲烷；
5、经步骤4中脱甲烷塔13顶部获得的富甲烷气体经第四级换热器21冷却至-159℃后，通过富甲烷气体节流装置24降压至450kPa后进入低温精馏塔25；
6、经步骤5中脱甲烷塔13底部获得的液相进入脱乙烷塔18脱除乙烷，脱乙烷塔18顶部的乙烷气体经乙烷节流装置15降压至310kPa后为第一级换热器10提供冷量，脱乙烷塔18底部的液体进入液化气塔20，从液化气塔20顶部获得LPG，底部获得稳定轻烃。
7、混合制冷剂经第一级制冷剂压缩机1压缩至800kPa，然后经第一级制冷剂冷却器2冷却至40℃后进入第一级气液分离器3；
8、经步骤7分离得到的气相经第二级制冷剂压缩机4压缩至3000kPa，然后经第二级制冷剂冷却器5冷却至40℃；经步骤7分离得到的液相经制冷剂泵6增压至3000kPa，然后经泵冷却器7冷却至40℃；
9、经步骤8增压后的气相制冷剂和液相制冷剂在第一级混合器8中混合后进入第二级气液分离器9；
10、经步骤9分离出的气相混合制冷剂经第一级换热器10、第二级换热器14、第三级换热器19和第四级换热器21冷却至-160℃后经第二级制冷剂节流阀22节流至272.8kPa，温度降低为-171.8℃，然后第四级换热器21和第三级换热器19提供冷量并复温至-70.18℃；分离出的液相混合制冷剂经第一级换热器10和第二级换热器14预冷至-65℃后经第一级制冷剂节流阀16节流至252.8kPa后与从第四级换热器21和第三级换热器19提供冷量后出来的混合制冷剂混合后为第二级换热器14和第一级换热器10提供冷量。
经过模拟计算得出，该小型撬装式混合制冷剂天然气液化和NGL回收一体工艺的单位能耗为0.51kWh／Nm3，产品回收率为97.19％。
实施例2
天然气摩尔组分77.16％CH4+12.51％C2H6+4.42％C3H8+0.07％i-C4H10+0.09％n-C4H10+0.02％i-C5H12+0.02％n-C5H12+0.01C6H14+3.80％N2、压力5.00MPa、温度45℃、流量90.82kmol／h，小型撬装式混合制冷剂天然气液化和NGL回收一体工艺的具体步骤如下：
1、原料天然气第一级换热器10冷却至-20℃后进入三相分离器11，三相分离器11顶部出来的气相继续经第二级换热器14、第三级换热器19和第四级换热器21冷却至-160℃后液化；
2、经步骤1冷却液化后的天然气进入低温精馏撬块，经所述天然气节流装置23节流至450kPa后进入低温精馏塔25；
3、经步骤2中低温精馏塔25底部获得的液化天然气进入第四级换热器21过冷至-150℃后进入天然气储存撬块；低温精馏塔25顶部的闪蒸气依次返回第四级换热器21、第三级换热器19、第二级换热器14和第一级换热器10提供冷量；
4、经步骤1中三相分离器11中部得到的液相经NGL节流装置12降压至1.31MPa后从第一级换热器10返流提供冷量，自身温度上升至25℃，随后进入脱甲烷塔13脱除甲烷；
5、经步骤4中脱甲烷塔13顶部获得的富甲烷气体经第四级换热器21冷却至-159℃后，通过富甲烷气体节流装置24降压至450kPa后进入低温精馏塔25；
6、经步骤5中脱甲烷塔13底部获得的液相进入脱乙烷塔18脱除乙烷，脱乙烷塔18顶部的乙烷气体经乙烷节流装置15降压至310kPa后为第一级换热器10提供冷量，脱乙烷塔18底部的液体进入液化气塔20，从液化气塔20顶部获得LPG，底部获得稳定轻烃。
7、混合制冷剂经第一级制冷剂压缩机1压缩至800kPa，然后经第一级制冷剂冷却器2冷却至40℃后进入第一级气液分离器3；
8、经步骤7分离得到的气相经第二级制冷剂压缩机4压缩至3000kPa，然后经第二级制冷剂冷却器5冷却至40℃；经步骤7分离得到的液相经制冷剂泵6增压至3000kPa，然后经泵冷却器7冷却至40℃；
9、经步骤8增压后的气相制冷剂和液相制冷剂在第一级混合器8中混合后进入第二级气液分离器9；
10、经步骤9分离出的气相混合制冷剂经第一级换热器10、第二级换热器14、第三级换热器19和第四级换热器21冷却至-160℃后经第二级制冷剂节流阀22节流至272.8kPa，温度降低为-171.8℃，然后第四级换热器21和第三级换热器19提供冷量并复温至-69.27℃；分离出的液相混合制冷剂经第一级换热器10和第二级换热器14预冷至-65℃后经第一级制冷剂节流阀16节流至252.8kPa后与从第四级换热器21和第三级换热器19提供冷量后出来的混合制冷剂混合后为第二级换热器14和第一级换热器10提供冷量。
经过模拟计算得出，该小型撬装式氮膨胀天然气液化工艺的单位能耗为0.41kWh／Nm3，该工艺的产品回收率为96.33％。比较实施例1和实施例2可以发现，该液化工艺可以适应原料气在一定范围内的变化，只需要调整工艺中的某几个参数，证明该液化工艺对不同气源有较强的适应性。
以上对本发明的具体实施例进行了描述。需要理解的是，本发明并不局限于上述特定实施方式，本领域技术人员可以在权利要求的范围内做出各种变形或修改，这并不影响本发明的实质内容。

Claims (10)

1.一种小型撬装式混合制冷剂天然气液化和NGL回收一体***，其特征在于，所述***包括天然气液化模块、混合制冷剂循环模块和NGL回收模块；所述天然气液化模块包括依次相连的液化冷箱撬块、低温精馏撬块和天然气存储撬块，所述液化冷箱撬块包括与三相分离器(11)进口端相连的第一级换热器(10)以及依次相连的第二级换热器(14)、第三级换热器(19)、第四级换热器(21)和天然气节流装置(23)，所述第二级换热器(14)与三相分离器(11)气相出口端相连；所述混合制冷剂循环模块为由混合制冷剂压缩撬块、第二级气液分离器(9)、并列设置的气、液相制冷剂支路、第二级混合器(17)、第二级换热器(14)以及第一级换热器(10)构成的循环回路，所述液相制冷剂支路由第二级气液分离器(9)液相出口端、第一、二级换热器(10、14)、第一级制冷剂节流装置(16)连接而成，所述气相制冷剂支路由第二级气液分离器(9)气相出口端、第一、二、三、四级换热器(10、14、19、21)、第二级制冷剂节流装置(22)、第四级换热器(21)、第三换热器(19)连接而成；所述NGL回收模块包括NGL节流装置(12)、脱甲烷塔(13)、乙烷节流装置(15)、脱乙烷塔(18)和液化气塔(20)，所述NGL节流装置(12)的进口端与三相分离器(11)液相出口端相连，所述脱甲烷塔(13)进口端经第一级换热器(10)与NGL节流装置(12)的出口端相连，所述脱甲烷塔(13)的气相出口端依次经第四级换热器(21)、富甲烷气体节流装置(24)与低温精馏撬块相连，所述脱甲烷塔(13)的液相出口端与脱乙烷塔(18)的进口端、脱乙烷塔(18)的液相出口端、液化气塔(20)依次相连，所述脱乙烷塔(18)的气相出口端经乙烷节流装置(15)与第一级换热器(10)相连。
2.根据权利要求1所述的小型撬装式混合制冷剂天然气液化和NGL回收一体***，其特征在于，所述低温精馏撬块为低温精馏塔(25)，所述低温精馏塔(25)的塔底出口与天然气存储撬块相连，所述低温精馏塔(25)的塔顶出口与第四级换热器(21)、第三级换热器(19)、第二级换热器(14)和第一级换热器(10)依次相连。
3.根据权利要求1所述的小型撬装式混合制冷剂天然气液化和NGL回收一体***，其特征在于，所述NGL节流装置(12)、乙烷节流装置(15)、第一级制冷剂节流装置(16)、第二级制冷剂节流装置(22)和天然气节流装置(23)为节流阀或液体膨胀机。
4.根据权利要求1所述的小型撬装式混合制冷剂天然气液化和NGL回收一体***，其特征在于，所述混合制冷剂压缩撬块包括第一级制冷剂压缩机(1)、第一级制冷剂冷却器(2)、第一级气液分离器(3)、第二级制冷剂压缩机(4)、第二级制冷剂冷却器(5)、制冷剂泵(6)、泵冷却器(7)和第一级混合器(8)，所述第一级制冷剂压缩机(1)、第一级制冷剂冷却器(2)、第一级气液分离器(3)的进口依次相连，所述第一级气液分离器(3)的气相出口与第二级制冷剂压缩机(4)、第二级制冷剂冷却器(5)依次相连，所述第一级气液分离器(3)的液相出口与制冷剂泵(6)、泵冷却器(7)相连，所述第一级混合器(8)的进口分别与第二级制冷剂冷却器(5)、泵冷却器(7)相连。
5.根据权利要求1所述的小型撬装式混合制冷剂天然气液化和NGL回收一体***，其特征在于，所述***还包括制冷剂储存及配比单元、仪控单元、仪表风及PSA制氮撬块。
6.根据权利要求1所述的小型撬装式混合制冷剂天然气液化和NGL回收一体***，其特征在于，所述***还包括发电机撬块。
7.根据权利要求1所述的小型撬装式混合制冷剂天然气液化和NGL回收一体***，其特征在于，所述***还包括稳定轻烃储存撬块和LPG储存撬块；所述稳定轻烃储存撬块与液化气塔(20)液相出口端相连，所述LPG储存撬块与液化气塔(20)气相出口端相连。
8.一种如权利要求1所述的小型撬装式混合制冷剂天然气液化和NGL回收一体***的使用方法，其特征在于，包括如下步骤：
A、原料天然气经第一级换热器(10)冷却后进入三相分离器(11)，三相分离器(11)顶部出来的气相继续经第二级换热器(14)、第三级换热器(19)和第四级换热器(21)冷却液化；
B、经所述步骤A冷却液化后的天然气经所述天然气节流装置(23)节流降温后进入低温精馏塔(25)，低温精馏塔(25)底部的液化天然气进入第四级换热器(21)过冷后进入天然气储存撬块；低温精馏塔(25)顶部的闪蒸气依次返回所述第四级换热器(21)、第三级换热器(19)、第二级换热器(14)和第一级换热器(10)提供冷量；
C、经所述三相分离器(11)中部得到的液相经NGL节流装置(12)降压后从第一级换热器(10)返流提供冷量，随后进入脱甲烷塔(13)脱除甲烷，脱甲烷塔(13)顶部的富甲烷气体经第四级换热器(21)冷却后，通过富甲烷气体节流装置(24)降压，进入低温精馏塔(25)；脱甲烷塔(13)底部的液相进入脱乙烷塔(18)脱除乙烷，脱乙烷塔(18)顶部的乙烷气体经乙烷节流装置(15)降压后为第一级换热器(10)提供冷量，脱乙烷塔(18)底部的液体进入液化气塔(20)，从液化气塔(20)顶部获得LPG，底部获得稳定轻烃；
D、混合制冷剂原料经所述混合制冷剂压缩撬块增压、冷却后进入第二级气液分离器(9)进行气液分离；分离出的气相混合制冷剂经第一级换热器(10)、第二级换热器(14)、第三级换热器(19)和第四级换热器(21)冷却后经第二级制冷剂节流阀(22)节流降温，为第四级换热器(21)和第三级换热器(19)提供冷量；分离出的液相混合制冷剂经第一级换热器(10)和第二级换热器(14)预冷后经第一级制冷剂节流阀(16)节流降温，而后与从所述第四级换热器(21)和第三级换热器(19)提供冷量后出来的混合制冷剂混合后为第二级换热器(14)和第一级换热器(10)提供冷量，从所述第一级换热器(10)提供冷量后出来的混合制冷剂返回混合制冷剂压缩撬块完成制冷循环。
9.根据权利要求8所述的使用方法，其特征在于，步骤B中，所述液化天然气储存压力为0.40MPa。
10.根据权利要求8所述的使用方法，其特征在于，步骤B中，所述液化天然气需过冷2℃以上。
CN201410083220.5A 2014-03-07 2014-03-07 小型撬装式混合制冷剂天然气液化和ngl回收一体*** Active CN103868324B (zh)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410083220.5A CN103868324B (zh) 2014-03-07 2014-03-07 小型撬装式混合制冷剂天然气液化和ngl回收一体***

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410083220.5A CN103868324B (zh) 2014-03-07 2014-03-07 小型撬装式混合制冷剂天然气液化和ngl回收一体***

Publications (2)

Publication Number Publication Date
CN103868324A CN103868324A (zh) 2014-06-18
CN103868324B true CN103868324B (zh) 2015-10-14

Family

ID=50907117

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201410083220.5A Active CN103868324B (zh) 2014-03-07 2014-03-07 小型撬装式混合制冷剂天然气液化和ngl回收一体***

Country Status (1)

Country Link
CN (1) CN103868324B (zh)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106152702B (zh) * 2015-04-23 2019-01-22 廊坊河忠新能源科技有限公司 利用液氮制冷回收油田伴生气中轻烃的方法和设备
CN107228525A (zh) * 2016-03-25 2017-10-03 王建基 油田天然气混合冷剂制冷天然气液化工艺技术和稳定混合烃回收工艺技术
CN106524666B (zh) * 2016-10-28 2022-10-21 宁夏凯添燃气发展股份有限公司 一体化移动式天然气液化装置
CN106766671A (zh) * 2017-01-15 2017-05-31 郑州大学 一种新型撬装式加气站bog液化***
US11320196B2 (en) 2017-12-15 2022-05-03 Saudi Arabian Oil Company Process integration for natural gas liquid recovery

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4545795A (en) * 1983-10-25 1985-10-08 Air Products And Chemicals, Inc. Dual mixed refrigerant natural gas liquefaction
US4548629A (en) * 1983-10-11 1985-10-22 Exxon Production Research Co. Process for the liquefaction of natural gas
US6620399B1 (en) * 2000-04-10 2003-09-16 Robert Rudolf Josef Jungerhans Purification of gases, in synthesis gas production process
EP1479989A1 (en) * 2003-05-19 2004-11-24 L'Air Liquide S. A. à Directoire et Conseil de Surveillance pour l'Etude et l'Exploitation des Procédés Georges Claude Process and installation for providing gaseous carbon monoxide and/or a mixture containing carbon monoxide
WO2006031362A1 (en) * 2004-09-14 2006-03-23 Exxonmobil Upstream Research Company Method of extracting ethane from liquefied natural gas
FR2916523A1 (fr) * 2007-05-21 2008-11-28 Air Liquide Capacite de stockage, appareil et procede de production de monoxyde de carbone et/ou d'hydrogene par separation cryogenique integrant une telle capacite.
CN102519222A (zh) * 2011-12-13 2012-06-27 杭州中泰深冷技术股份有限公司 一种焦炉气制液化天然气的深冷分离方法
CN103215093A (zh) * 2013-03-14 2013-07-24 上海交通大学 小型撬装式氮膨胀天然气液化***及其方法
CN103363778A (zh) * 2013-03-14 2013-10-23 上海交通大学 小型撬装式单阶混合制冷剂天然气液化***及其方法

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4548629A (en) * 1983-10-11 1985-10-22 Exxon Production Research Co. Process for the liquefaction of natural gas
US4545795A (en) * 1983-10-25 1985-10-08 Air Products And Chemicals, Inc. Dual mixed refrigerant natural gas liquefaction
US6620399B1 (en) * 2000-04-10 2003-09-16 Robert Rudolf Josef Jungerhans Purification of gases, in synthesis gas production process
EP1479989A1 (en) * 2003-05-19 2004-11-24 L'Air Liquide S. A. à Directoire et Conseil de Surveillance pour l'Etude et l'Exploitation des Procédés Georges Claude Process and installation for providing gaseous carbon monoxide and/or a mixture containing carbon monoxide
WO2006031362A1 (en) * 2004-09-14 2006-03-23 Exxonmobil Upstream Research Company Method of extracting ethane from liquefied natural gas
FR2916523A1 (fr) * 2007-05-21 2008-11-28 Air Liquide Capacite de stockage, appareil et procede de production de monoxyde de carbone et/ou d'hydrogene par separation cryogenique integrant une telle capacite.
CN102519222A (zh) * 2011-12-13 2012-06-27 杭州中泰深冷技术股份有限公司 一种焦炉气制液化天然气的深冷分离方法
CN103215093A (zh) * 2013-03-14 2013-07-24 上海交通大学 小型撬装式氮膨胀天然气液化***及其方法
CN103363778A (zh) * 2013-03-14 2013-10-23 上海交通大学 小型撬装式单阶混合制冷剂天然气液化***及其方法

Also Published As

Publication number Publication date
CN103868324A (zh) 2014-06-18

Similar Documents

Publication Publication Date Title
CN103215093B (zh) 小型撬装式氮膨胀天然气液化***及其方法
CN103363778B (zh) 小型撬装式单阶混合制冷剂天然气液化***及其方法
CA2836628C (en) Process for liquefaction of natural gas
CN103697659B (zh) 从富甲烷气中制取液化天然气和富氢产品的装置及方法
CN101539362B (zh) 一种考虑总能***的多级膨胀分布式天然气液化***
CN100392052C (zh) 一种用于燃气调峰和轻烃回收的天然气液化方法
CN103868324B (zh) 小型撬装式混合制冷剂天然气液化和ngl回收一体***
CN103865601B (zh) 丙烷预冷脱乙烷塔顶回流的重烃回收方法
CN103175381B (zh) 低浓度煤层气含氧深冷液化制取lng工艺
CN102200370A (zh) 一种膨胀式可燃气体液化装置及流程
CN104930815A (zh) 适用于海上的天然气液化及ngl回收***及应用
CA3003614A1 (en) Systems and methods for lng refrigeration and liquefaction
CN105737515A (zh) 基于板式换热器模块化混合制冷剂天然气液化***及方法
CN105571269A (zh) 含高氮氧氢的煤层气低温精馏液化分离回收***及方法
CN103542692B (zh) 基于缠绕管式换热器的非常规天然气液化***
CN102748918A (zh) 双级混合冷剂循环天然气液化***
CN202813975U (zh) 一种基于缠绕管式换热器的非常规天然气液化***
CN102435045A (zh) 液氮洗涤净化合成气及其深冷分离回收lng装置
CN102564057A (zh) 一种应用于基荷型天然气液化工厂的丙烷预冷混合冷剂液化***
CN104567276B (zh) 回收合成氨尾气生产lng的装置及工艺方法
CN103175380B (zh) 低浓度煤层气含氧深冷液化制取lng装置
CN205747680U (zh) 一种天然气液化与轻烃分离一体化集成工艺***
CN103175379B (zh) 利用管道压力能制备液化天然气的装置及使用方法
CN202382518U (zh) 液氮洗涤净化合成气及其深冷分离回收lng装置
CN103868322A (zh) 一种用于海上天然气开采的预冷式重烃回收***及工艺

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant
TR01 Transfer of patent right
TR01 Transfer of patent right

Effective date of registration: 20191210

Address after: Haiying Road, Qidong high tech Industrial Development Zone, Nantong City, Jiangsu Province

Patentee after: Ke Lin en New Energy Technology (Jiangsu) Co., Ltd.

Address before: 200240 Dongchuan Road, Shanghai, No. 800, No.

Patentee before: Shanghai Jiaotong University