CN100441990C - 利用空分制冷系统的小型天然气液化装置 - Google Patents

利用空分制冷系统的小型天然气液化装置 Download PDF

Info

Publication number
CN100441990C
CN100441990C CNB2006101044661A CN200610104466A CN100441990C CN 100441990 C CN100441990 C CN 100441990C CN B2006101044661 A CNB2006101044661 A CN B2006101044661A CN 200610104466 A CN200610104466 A CN 200610104466A CN 100441990 C CN100441990 C CN 100441990C
Authority
CN
China
Prior art keywords
natural gas
liquefier
pipeline
heat exchanger
main heat
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.)
Expired - Fee Related
Application number
CNB2006101044661A
Other languages
English (en)
Other versions
CN1908558A (zh
Inventor
厉彦忠
燕娜
脱瀚斐
鱼剑琳
谭宏博
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.)
Xian Jiaotong University
Original Assignee
Xian 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 Xian Jiaotong University filed Critical Xian Jiaotong University
Priority to CNB2006101044661A priority Critical patent/CN100441990C/zh
Publication of CN1908558A publication Critical patent/CN1908558A/zh
Application granted granted Critical
Publication of CN100441990C publication Critical patent/CN100441990C/zh
Expired - Fee Related 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
    • F25J3/04—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 for air
    • F25J3/04521—Coupling of the air fractionation unit to an air gas-consuming unit, so-called integrated processes
    • F25J3/04612—Heat exchange integration with process streams, e.g. from the air gas consuming unit
    • 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"
    • F25J1/004—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 flash gas recovery
    • 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
    • F25J1/0221—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 the cold stored in an external cryogenic component in an open refrigeration 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
    • 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
    • F25J1/0234—Integration with a cryogenic air separation unit
    • 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
    • F25J3/04—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 for air
    • F25J3/04151—Purification and (pre-)cooling of the feed air; recuperative heat-exchange with product streams
    • F25J3/04187—Cooling of the purified feed air by recuperative heat-exchange; Heat-exchange with product streams
    • F25J3/04193—Division of the main heat exchange line in consecutive sections having different functions
    • F25J3/042—Division of the main heat exchange line in consecutive sections having different functions having an intermediate feed connection
    • 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
    • F25J3/04—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 for air
    • F25J3/04151—Purification and (pre-)cooling of the feed air; recuperative heat-exchange with product streams
    • F25J3/04187—Cooling of the purified feed air by recuperative heat-exchange; Heat-exchange with product streams
    • F25J3/04218—Parallel arrangement of the main heat exchange line in cores having different functions, e.g. in low pressure and high pressure cores
    • F25J3/04224—Cores associated with a liquefaction or refrigeration 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
    • 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
    • F25J3/04—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 for air
    • F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
    • F25J3/04284—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams
    • F25J3/04309—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams 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
    • 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
    • F25J3/04—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 for air
    • F25J3/04406—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 for air using a dual pressure main column system
    • F25J3/04412—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 for air using a dual pressure main column system in a classical double column flowsheet, i.e. with thermal coupling by a main reboiler-condenser in the bottom of low pressure respectively top of high pressure 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
    • F25J2210/00—Processes characterised by the type or other details of the feed stream
    • F25J2210/42—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
    • F25J2270/00—Refrigeration techniques used
    • F25J2270/14—External refrigeration with work-producing gas expansion loop

Landscapes

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

Abstract

本发明公开了利用空分装置制冷系统的小型天然气液化装置，包括通过管路相互连接的脱水装置、脱酸装置、天然气压缩机和水冷却器；水冷却器通过管路还依次连接有预冷器和液化器，液化器通过阀门节流降压后连接至气液分离器；气液分离器的底部通过管路和LNG储罐相连接；气液分离器的顶部经管路也与液化器和预冷器连通；装置还包括有一个主换热器，该主换热器通过空气管路连接有精馏塔，并通过精馏塔下塔顶部通过管道返回主换热器，该主换热器还和氮气膨胀机连接，该氮气膨胀机通过天然气管道与液化器以及预冷器相连通。本发明结构简单，能耗低，以制冷量大的空分流程制冷系统替代天然气液化流程中结构复杂、安全性差的制冷系统，能够实现能量的综合利用。

Description

利用空分制冷系统的小型天然气液化装置
技术领域
本发明涉及天然气液化和空气分离装置，特别是利用空分制冷系统的小型天然气液化装置。
背景技术
液化天然气(LNG)是天然气经过脱酸、脱水处理，通过低温工艺冷冻液化而成的低温(-162℃)液体混合物。液化天然气的体积只有同量气态体积的1/625，因而将其液化之后，一是有利于降低贮存和运输成本，便于远距离运输；二是可以提高单位体积的燃值(达到相当于汽油的水平)，用于发电和交通运输工具(汽车、船舶和飞机)的燃料。此外，还具有清洁、环保等特点。可用于天然气液化流程很多，按制冷方式可以分为级联式液化流程、混合制冷剂流程以及带膨胀机的流程。按照用途又可以分为基本负荷型液化流程和调峰型液化流程。我国的天然气资源丰富，但分布较散，小型气田占有较大的比例。对于小型分散气田来说，铺设管网进行远距离输送不仅工程浩大而且不经济。若将这些天然气液化之后采用槽车输送就大大降低了原料气的处理成本，增加了经济性以及资源利用的灵活性。因此，适合于分散气田的天然气液化技术是一项非常值得研究的课题。
目前，小型的天然气液化装置普遍采用带膨胀机的制冷循环，制冷工质通常为氮气或天然气。其中，采用天然气膨胀制冷的循环由于工质的易燃性，高压压缩过程中存在安全隐患，且液化系数偏低等缺点发展缓慢。而采用氮气膨胀制冷的循环，不仅结构紧凑，运行灵活，适应性强，且安全性好，放电不会引起火灾或爆炸危险。制冷循环氮气的获得往往是购买现成的氮气产品，这样就提高了生产过程中的运行成本。如果能够就地取材，以空气为原料，通过空气分离装置获得循环所需的氮气，并将空分装置制冷系统的冷量用于天然气液化循环中，不仅降低了循环工质的成本，省去了繁琐的运输环节，而且实现了冷量的综合利用。
空气分离装置是利用空气为原料，通过把空气液化后，根据氧气、氮气、氩气等的沸点不同使之分离，从而产生氧气、氮气、氩气及其液体的装置。空分装置制冷系统主要用于提供维持低温环境的冷量，使空气液化以保证精馏工况正常进行，启动过程中冷却设备、积累液空的冷量，分离设备的跑冷损失以及复热不足损失。该制冷系统通常是利用空气或氮气在节流阀中的节流膨胀或在膨胀机中的绝热膨胀产生冷量的。这样的制冷系统不仅制冷温度低，冷量大，而且运行压力较低，安全。如前所述，如果在生产氧气、氮气等空分产品的同时，将该制冷系统提供的冷量用于天然气的液化，就可以充分发挥空分系统所带来的经济效益。
发明内容
本发明的目的在于，提供一种利用空分装置制冷系统的小型天然气液化装置。
为了实现上述任务，本发明采取以下天然气液化技术解决方案：
一种利用空分制冷系统的小型天然气液化装置，包括通过管路相互连接的脱水装置、脱酸装置、天然气压缩机和水冷却器；所述的水冷却器通过管路还连接有预冷器和液化器，液化器通过阀门节流降压后连接至气液分离器；气液分离器的底部通过管路和LNG储罐相连接；气液分离器的顶部经管路也与液化器和预冷器连通；
上述的天然气液化装置还包括有通过管路相互连接的氮气膨胀机、主换热器、精馏塔；所述的主换热器通过空气管路连接精馏塔，精馏塔下塔顶部通过第一氮气管路连接主换热器，主换热器通过第二氮气管路连接膨胀机；氮气膨胀机通过第三氮气管路与液化器以及预冷器相连。
本发明一方面采用技术成熟，结构简单，制冷量大的空分流程制冷系统替代了天然气液化流程中结构复杂、安全性差的制冷系统，实现了能量的综合利用，另一方面以低能耗的优势实现了小型分散气田的天然气液化。
附图说明
图1是本发明的利用空分装置制冷系统的小型天然气液化装置结构示意图；
以下结合附图对本发明作进一步的详细说明。
具体实施方式
本发明的利用空分装置制冷系统的小型天然气液化装置，包括：脱水装置1，脱酸装置2，天然气压缩机3，水冷却器4，预冷器5，液化器6，气液分离器7，LNG储罐8，氮气膨胀机9，主换热器10，精馏塔11。
脱水装置1、脱酸装置2、天然气压缩机3和水冷却器4通过管路相互连接；水冷却器4通过管路还连接有预冷器5和液化器6，液化器6通过阀门J1节流降压后连接至气液分离器7；气液分离器7的底部通过管路和LNG储罐8相连接；气液分离器7的顶部经管路也与液化器6和预冷器5连通；
主换热器10通过空气管路连接有空分精馏塔11，精馏塔下塔顶部通过氮气管路连接主换热器10，主换热器10通过氮气管路连接膨胀机9；氮气膨胀机9通过氮气管路与液化器6以及预冷器5相连。
上述精馏塔11的具体结构包括：采用填料结构的上塔，板翅式冷凝蒸发器，以及采用筛板结构的下塔，上塔和下塔通过管道与冷凝蒸发器连接。由于精馏塔已经是非常成熟的产品。因此精馏塔11可以根据需要进行结构设计，或采用市售的成熟产品均可。
其工作过程如图1所示。天然气液化回路工作过程如下：原料天然气经通道NG1→NG2在脱水装置1中除去水分，然后经NG2→NG3通道在脱酸装置中除去CO2等酸性气体，通过管道NG3→NG4在天然气压缩机3中被压缩至约1.0MPa，并通过管道NG4→NG5在水冷却器4中冷却至常温，随后通过管道NG5→NG6在预冷器5中预冷至一定温度，再经管道NG6→NG7在液化器7中液化，然后经过节流阀J1节流降压，最后通过气液分离器7分离得到液体产品储存在LNG储罐8中。气液分离器7分离得到的气体处于饱和状态，经管道NG9→NG10首先在液化器6中释放部分冷量，再通过管道NG10→NG11在预冷器5中释放掉剩余的冷量，复热到常温，重新进入液化循环。
空分制冷系统回路工作过程如下：首先原料空气经管道A1→A2在主换热器10中被冷却到饱和气态，送入精馏塔11中进行气液分离，从精馏塔11的下塔顶部引出部分氮气作为天然气液化循环的制冷工质，通过管道GN1→GN2在主换热器9中复热到一定温度，然后在氮气膨胀机9中绝热膨胀至GN3压力约0.15MPa，再通过管道GN3→GN4在液化器6中释放部分冷量，最后一部分氮气通过管道GN4→GN6在预冷器5中复热到常温作为空分系统的产品输出，另一部分氮气通过管道GN4→GN5在主换热器10中复热到常温，也作为空分系统的产品输出。
本发明的利用空分装置制冷系统的小型天然气液化装置特点是：
1.利用空分系统的拉赫曼气体来产生天然气液化过程所需的冷量，在完成了LNG产品的生产的同时，还得到了一些空分产品。
2.现行空分装置的制冷系统技术成熟，结构简单且制冷量大，将该制冷系统用于LNG的生产，可以替代传统的LNG生产流程制冷系统。
3.由于空分制冷系统的制冷温度较低，冷量充足，天然气液化过程可以在较低的运行压力下完成，避免了传统流程中高压压缩的危险，提高了安全性。
4.制冷循环的实质是属于氮气膨胀产生冷量的循环，本方案中氮气来源于空分系统的部分氮气产品，因此不需要额外提供制冷工质。
5.可以根据调节空分系统膨胀氮气的量来改变制冷量，进而调节LNG的产量，能适应一定范围内的负荷变化。
6.与传统的氮气膨胀制冷液化天然气循环相比，该方案减小了换热器冷端温差，从而减少了不可逆损失。
7.本方案可以设计成小型的撬装式可移动装置，便于从事分散地的天然气液化工作。

Claims (1)

1.一种利用空分制冷系统的小型天然气液化装置，包括通过管路相互连接的脱水装置(1)、脱酸装置(2)、天然气压缩机(3)和水冷却器(4)；其特征在于，所述的水冷却器(4)通过管路还连接有预冷器(5)和液化器(6)，液化器(6)通过阀门(J1)节流降压后连接至气液分离器(7)；气液分离器(7)的底部通过管路和LNG储罐(8)相连接；气液分离器(7)的顶部经管路也与液化器(6)和预冷器(5)连通；
上述的天然气液化装置还包括有通过管路相互连接的氮气膨胀机(9)、主换热器(10)、精馏塔(11)；所述的主换热器(10)通过空气管路连接精馏塔(11)，精馏塔下塔顶部通过第一氮气管路连接主换热器(10)，主换热器(10)通过第二氮气管路连接膨胀机(9)；氮气膨胀机(9)通过第三氮气管路与液化器(6)以及预冷器(5)相连。
CNB2006101044661A 2006-08-03 2006-08-03 利用空分制冷系统的小型天然气液化装置 Expired - Fee Related CN100441990C (zh)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNB2006101044661A CN100441990C (zh) 2006-08-03 2006-08-03 利用空分制冷系统的小型天然气液化装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNB2006101044661A CN100441990C (zh) 2006-08-03 2006-08-03 利用空分制冷系统的小型天然气液化装置

Publications (2)

Publication Number Publication Date
CN1908558A CN1908558A (zh) 2007-02-07
CN100441990C true CN100441990C (zh) 2008-12-10

Family

ID=37699735

Family Applications (1)

Application Number Title Priority Date Filing Date
CNB2006101044661A Expired - Fee Related CN100441990C (zh) 2006-08-03 2006-08-03 利用空分制冷系统的小型天然气液化装置

Country Status (1)

Country Link
CN (1) CN100441990C (zh)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101839612B (zh) * 2010-04-06 2012-05-02 浙江大学 基于lng卫星站冷能利用的倒灌式空气分离系统及方法
GB2503747A (en) * 2012-07-06 2014-01-08 Linde Ag Micro liquefied natural gas plant with no loss turbo compressor
FR3044747B1 (fr) * 2015-12-07 2019-12-20 L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude Procede de liquefaction de gaz naturel et d'azote
CN110274438A (zh) * 2019-05-27 2019-09-24 陕西秦风气体股份有限公司 一种空分装置
CN110230916A (zh) * 2019-06-17 2019-09-13 合肥万豪能源设备有限责任公司 一种用于深冷空分联产lng的装置
CN115031490B (zh) * 2022-06-18 2023-03-24 华海(北京)科技股份有限公司 节能型液化天然气冷能空分系统

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0545050A (ja) * 1991-08-09 1993-02-23 Nippon Sanso Kk 液化天然ガスの寒冷を利用した永久ガスの液化方法
US5390499A (en) * 1993-10-27 1995-02-21 Liquid Carbonic Corporation Process to increase natural gas methane content
CN1133964A (zh) * 1994-12-23 1996-10-23 乔治·克劳德方法的研究开发空气股份有限公司 利用低温蒸馏分离气体混合物的方法
CN1330761A (zh) * 1998-11-18 2002-01-09 国际壳牌研究有限公司 液化天然气的设备
US6581409B2 (en) * 2001-05-04 2003-06-24 Bechtel Bwxt Idaho, Llc Apparatus for the liquefaction of natural gas and methods related to same
CN1501044A (zh) * 2002-11-01 2004-06-02 液体空气乔治洛德方法利用和研究的具 组合的空气分离和天然气液化装置
CN1616908A (zh) * 2004-10-28 2005-05-18 苏州市兴鲁空分设备科技发展有限公司 一种空气分离的方法和装置
CN1742186A (zh) * 2003-01-22 2006-03-01 Lng国际有限公司 一种制冷方法以及液化天然气的生产

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0545050A (ja) * 1991-08-09 1993-02-23 Nippon Sanso Kk 液化天然ガスの寒冷を利用した永久ガスの液化方法
US5390499A (en) * 1993-10-27 1995-02-21 Liquid Carbonic Corporation Process to increase natural gas methane content
CN1133964A (zh) * 1994-12-23 1996-10-23 乔治·克劳德方法的研究开发空气股份有限公司 利用低温蒸馏分离气体混合物的方法
CN1330761A (zh) * 1998-11-18 2002-01-09 国际壳牌研究有限公司 液化天然气的设备
US6581409B2 (en) * 2001-05-04 2003-06-24 Bechtel Bwxt Idaho, Llc Apparatus for the liquefaction of natural gas and methods related to same
CN1501044A (zh) * 2002-11-01 2004-06-02 液体空气乔治洛德方法利用和研究的具 组合的空气分离和天然气液化装置
CN1742186A (zh) * 2003-01-22 2006-03-01 Lng国际有限公司 一种制冷方法以及液化天然气的生产
CN1616908A (zh) * 2004-10-28 2005-05-18 苏州市兴鲁空分设备科技发展有限公司 一种空气分离的方法和装置

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
小型液化天然气生产装置. 徐文渊.石油与天然气化工，第34卷第3期. 2005
小型液化天然气生产装置. 徐文渊.石油与天然气化工，第34卷第3期. 2005 *

Also Published As

Publication number Publication date
CN1908558A (zh) 2007-02-07

Similar Documents

Publication Publication Date Title
CA2836628C (en) Process for liquefaction of natural gas
CA2864482C (en) Method and system for liquefying natural gas using single mixed refrigerant and refrigeration medium
CA2856096C (en) System and method for liquefying natural gas using single mixed refrigerant as refrigeration medium
CN101608860B (zh) 混合制冷剂气体液化工艺及混合制冷剂
CN100441990C (zh) 利用空分制冷系统的小型天然气液化装置
CN103175381B (zh) 低浓度煤层气含氧深冷液化制取lng工艺
CN102748918A (zh) 双级混合冷剂循环天然气液化系统
CN104807287A (zh) 一种小型天然气液化制冷系统及方法
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系统
CN103175380B (zh) 低浓度煤层气含氧深冷液化制取lng装置
CN110186251A (zh) 一种适用于超大规模的三循环天然气液化装置及方法
CN101126041A (zh) 级联式制备液化天然气的方法
CN203310202U (zh) 一种应用于基荷型天然气液化工厂的双混合冷剂液化系统
CN205090721U (zh) 一种四组分冷剂高压节流制冷液化天然气系统
CN202382518U (zh) 液氮洗涤净化合成气及其深冷分离回收lng装置
CN101614464A (zh) 高低温氮气双膨胀天然气液化方法
CN102564061B (zh) 一种应用于基荷型天然气液化工厂的双级混合冷剂循环液化系统
CN114777412B (zh) 一种具有热虹吸式氢过冷器的氢气液化装置
CN106500458B (zh) 预冷式天然气液化工艺及系统
Zhu et al. Selection and simulation of offshore LNG liquefaction process
CN202692600U (zh) 一种双级混合冷剂循环天然气液化系统
CN205593290U (zh) 混合冷剂两路节流的单循环天然气液化装置
CN101392982A (zh) 一种液化富甲烷气的工艺流程
CN111763131A (zh) 一种冷干气回流生产乙烷的方法及其装置

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
C17 Cessation of patent right
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20081210

Termination date: 20110803