CN210663576U - 利用lng冷能制取高纯氧、氮的空分装置 - Google Patents

利用lng冷能制取高纯氧、氮的空分装置 Download PDF

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CN210663576U
CN210663576U CN201921666612.9U CN201921666612U CN210663576U CN 210663576 U CN210663576 U CN 210663576U CN 201921666612 U CN201921666612 U CN 201921666612U CN 210663576 U CN210663576 U CN 210663576U
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nitrogen
air separation
tower
pipeline
output pipeline
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王仁保
金志�
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Zhejiang Haichang Gas Co ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • F25J3/02—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
    • F25J3/04254—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using the cold stored in external cryogenic fluids
    • F25J3/0426—The cryogenic component does not participate in the fractionation
    • F25J3/04266—The cryogenic component does not participate in the fractionation and being liquefied 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
    • 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
    • F25J2245/00—Processes or apparatus involving steps for recycling of process streams
    • F25J2245/42—Processes or apparatus involving steps for recycling of process streams the recycled stream being 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
    • F25J2270/02—Internal refrigeration with liquid vaporising loop

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

Abstract

本实用新型属于气体提纯设备技术领域，具体涉及一种利用LNG冷能制取高纯氧、氮的空分装置，空分塔的下塔连接压力氮气输出管线，压力氮气输出管线和天然气换热管线经过换热器三进行换热，压力氮气输出管线内的氮气吸收液化天然气的冷量后冷凝成液氮后分成两股，一股流入空分塔的上塔，用于上塔上升气体的热质交换，另一股流入产品液氮储罐。本实用新型提供的空分装置，采用空分产生的压力氮气进行换热，并利用吸收冷量后的液氮倒灌回空分塔，减少了空分设备膨胀机、循环压缩机等配置，冷量利用更合理，收益高。

Description

利用LNG冷能制取高纯氧、氮的空分装置
技术领域
本实用新型属于气体提纯设备技术领域，具体涉及一种利用LNG冷能制取高纯氧、氮的空分装置。
背景技术
现有气体提纯设备采用液化天然气汽化后进行冷量交换，生产过程中汽化采用空温式汽化器与外界空气换热，液化天然气吸收热量汽化复热至常温，其液化天然气冷量大量浪费。
实用新型内容
本实用新型的目的是提供一种利用LNG冷能制取高纯氧、氮的空分装置，采用空分产生的压力氮气进行换热，并利用吸收冷量后的液氮倒灌回空分塔，减少了空分设备膨胀机、循环压缩机等配置，冷量利用更合理，收益高。
本实用新型的目的是这样实现的：一种利用LNG冷能制取高纯氧、氮的空分装置，包括空分塔、压力氮气输出管线、天然气换热管线，所述空分塔的下塔连接压力氮气输出管线，压力氮气输出管线和天然气换热管线经过换热器三进行换热，压力氮气输出管线内的氮气吸收液化天然气的冷量后冷凝成液氮后分成两股，一股流入空分塔的上塔，用于上塔上升气体的热质交换，另一股流入产品液氮储罐。
进一步的，所述换热器三为板式换热器。
进一步的，所述压力氮气输出管线从换热器三出来后，经过液氮过冷器和缓冲罐，通过真空输液管输出换热设备后，再分成两股。
进一步的，所述空分塔的下塔连接有空气输入管线，空气输入管线经过换热器一后进入下塔，压力氮气输出管线先与空气输入管线在换热器一热交换后，再连接换热器三。
进一步的，所述空分塔的上塔顶部连接产品氮气输出管线，上塔下部连接产品氧气输出管线，产品氮气输出管线和产品氧气输出管线均经过换热器一参与热交换。
本实用新型相比现有技术突出且有益的技术效果是：空分相关设备减少，能源利用率更高，降低了企业生产成本。
附图说明
图1是本实用新型实施例中压力氮气和液化天然气的换热系统原理图。
图2是本实用新型实施例中空分装置的整体系统原理图。
附图标记：AF、空气滤清器；PC、空气压缩机；PV、缓冲罐；RU、预冷机组；MS、分子筛纯化器；K1、冷凝蒸发器；EH、电加热器；SL、放空消声器；E1、换热器一；E2、液空液氮过冷器；E3、换热器三；E4、液氮过冷器；C1、下塔；K1、冷凝蒸发器；C2、上塔；S1、压力氮气输出管线；S2、空气输入管线；S3、液空管线；S4、产品液氧管线；S5、污氮排出管线；S6、产品氮气管线；S7、天然气换热管线；S8、产品氧气管线；S9、液氮管线。
具体实施方式
下面结合附图对本实用新型的具体实施方式作进一步详细说明。
一种利用LNG冷能制取高纯氧、氮的空分装置，参见图1和图2，包括空分塔，空分塔上部为上塔C2，中部为冷凝蒸发器K1，下部为下塔C1；空分塔依次连接产品氮气管线S6、液氮管线S9、污氮排出管线S5、产品氧气管线S8、产品液氧管线S4、压力氮气输出管线S1、液空管线S3和空气输入管线S2。液氮通过液氮管线S9由冷凝蒸发器K1底部回流至上塔C2形成循环；高压氮气在下塔C1形成并从下塔C1上部进入压力氮气输出管线S1；大气从空气输入管线S2进入下塔C1下部，下塔C1底部的液化空气通过液空管线S3回流至上塔C2形成液空循环。上塔C2内的产生的氮气从顶部进入产品氮气管线S6，含杂质气体的氮气进入稍靠下方的污氮排出管线S5，氧气从上塔C2下部流入产品氧气管线S8，冷凝的液氧在冷凝蒸发器K1处流入产品液氧管线S4。
压力氮气输出管线S1和天然气换热管线S7经过换热器三E3进行换热，压力氮气输出管线S1内的氮气吸收液化天然气的冷量后冷凝成液氮后，经过液氮过冷器E4和缓冲罐PV，通过真空输液管输出换热设备后，再分成两股，一股与液氮管线S9一同流入空分塔的上塔C2，用于上塔C2上升气体的热质交换，另一股流入产品液氮储罐。本实施例中换热器三E3为板式换热器。
液空管线S3和液氮管线S9分别经过液空液氮过冷器E2后再回流至上塔C2，产品氮气管线S6和污氮管线依次经过液空液氮管线S9和换热器一E1再排出或者收集；产品氧气管线S8和压力氮气管线通过经过换热器一E1与空气输入管线S2进行热交换，为输入空气进行预冷。
以上所述仅是本实用新型的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本实用新型技术原理的前提下，还可以做出若干改进和替换，这些改进和替换也应视为本实用新型的保护范围。

Claims (5)

1.一种利用LNG冷能制取高纯氧、氮的空分装置，包括空分塔、压力氮气输出管线、天然气换热管线，其特征在于：所述空分塔的下塔连接压力氮气输出管线，压力氮气输出管线和天然气换热管线经过换热器三进行换热，压力氮气输出管线内的氮气吸收液化天然气的冷量后冷凝成液氮后分成两股，一股流入空分塔的上塔，用于上塔上升气体的热质交换，另一股流入产品液氮储罐。
2.根据权利要求1所述的利用LNG冷能制取高纯氧、氮的空分装置，其特征在于：所述换热器三为板式换热器。
3.根据权利要求1所述的利用LNG冷能制取高纯氧、氮的空分装置，其特征在于：所述压力氮气输出管线从换热器三出来后，经过液氮过冷器和缓冲罐，通过真空输液管输出换热设备后，再分成两股。
4.根据权利要求1所述的利用LNG冷能制取高纯氧、氮的空分装置，其特征在于：所述空分塔的下塔连接有空气输入管线，空气输入管线经过换热器一后进入下塔，压力氮气输出管线先与空气输入管线在换热器一热交换后，再连接换热器三。
5.根据权利要求4所述的利用LNG冷能制取高纯氧、氮的空分装置，其特征在于：所述空分塔的上塔顶部连接产品氮气输出管线，上塔下部连接产品氧气输出管线，产品氮气输出管线和产品氧气输出管线均经过换热器一参与热交换。
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113851671A (zh) * 2021-09-16 2021-12-28 广东佛燃科技有限公司 一种净零排放的固体氧化物燃料电池系统

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113851671A (zh) * 2021-09-16 2021-12-28 广东佛燃科技有限公司 一种净零排放的固体氧化物燃料电池系统

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