CN112066642A - 一种高含氮和含氦天然气液化及粗氦和氮提取系统 - Google Patents

一种高含氮和含氦天然气液化及粗氦和氮提取系统 Download PDF

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CN112066642A
CN112066642A CN202011060980.6A CN202011060980A CN112066642A CN 112066642 A CN112066642 A CN 112066642A CN 202011060980 A CN202011060980 A CN 202011060980A CN 112066642 A CN112066642 A CN 112066642A
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natural gas
communicated
nitrogen
mixed refrigerant
heat exchanger
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CN202011060980.6A
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魏义江
黄科
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Sichuan Air Separation Group
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Sichuan Air Separation Group
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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
    • 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
    • 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
    • F25J3/0214—Liquefied natural gas
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    • 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
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    • 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"
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    • F25J1/0219—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 in combination with an internal quasi-closed refrigeration loop, e.g. using a deep flash recycle loop
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Abstract

本发明公开了一种高含氮和含氦天然气液化及粗氦和氮提取系统，属于提取系统技术领域，包括粗氦冷凝器，所述粗氦冷凝器分别连通有第二液氮节流阀、液氮过冷器、粗氦分离器和脱甲烷塔冷凝分离器，所述粗氦分离器分别连通有液氮过冷器和第一液氮节流阀，所述第一液氮节流阀的另一端连通有闪蒸汽分离器，所述闪蒸汽分离器连通有液氮过冷器，所述液氮过冷器连通有液氮蒸发压力控制阀，所述液氮蒸发压力控制阀的另一端连通有脱甲烷塔冷凝器，天然气放散少，氦气提取效率高、同时对天然气中的氮气提取生产液氮和氮气产品，经济效益好。

Description

一种高含氮和含氦天然气液化及粗氦和氮提取系统
技术领域
本发明涉及一种提取系统，特别是涉及一种高含氮和含氦天然气液化及粗氦和氮提取系统，属于提取系统技术领域。
背景技术
氦气是惰性气体的一种，是重要的战略物资，作为一种保护气体和超低温冷冻剂在航天、国防、半导体生产、核磁共振及气体检漏方面具有非常重要的用途，氦气主要存在于天然气中，从天然气中提取氦是氦气的主要工业来源，我国天然气中氦气含量少，单独从天然气中提取氦气成本高，液化天然气是一种清洁能源，随着国内天然气液化装置的兴起，实行LNG和粗氦提取联产使提氦有气经济可行性；对于含氮量低的天然气，天然气液化后粗氦可在LNG闪蒸气中提取，而现有技术中在进行提取的时候存在天然气放散比较多，提取氦气的效率低，而且无法实现对天然气中的氮气提取生产液氮和氮气产品导致能源浪费，无法实现循环利用，为此设计一种高含氮和含氦天然气液化及粗氦和氮提取系统来优化上述问题。
发明内容
本发明的主要目的是为了提供一种高含氮和含氦天然气液化及粗氦和氮提取系统解决上述问题。
本发明的目的可以通过采用如下技术方案达到：
一种高含氮和含氦天然气液化及粗氦和氮提取系统，包括粗氦冷凝器，所述粗氦冷凝器分别连通有第二液氮节流阀、液氮过冷器、粗氦分离器和脱甲烷塔冷凝分离器，所述粗氦分离器分别连通有液氮过冷器和第一液氮节流阀，所述第一液氮节流阀的另一端连通有闪蒸汽分离器，所述闪蒸汽分离器连通有液氮过冷器，所述液氮过冷器连通有液氮蒸发压力控制阀，所述液氮蒸发压力控制阀的另一端连通有脱甲烷塔冷凝器，所述脱甲烷塔冷凝器的一侧安装有脱甲烷塔，所述脱甲烷塔的另一侧安装有脱甲烷塔再沸器，所述脱甲烷塔与所述脱甲烷塔冷凝器连通，所述脱甲烷塔冷凝分离器分别与所述脱甲烷塔和脱甲烷塔冷凝器连通，所述脱甲烷塔冷凝器连通有循环氮节流阀，且所述循环氮节流阀的另一端分别与所述第二液氮节流阀和液氮过冷器连通，所述液氮过冷器连通有天然气过冷换热器，所述天然气过冷换热器分别与混合冷剂三级节流阀和天然气低温节流阀连通，所述天然气低温节流阀的另一端与天然气脱氮塔连通，所述天然气脱氮塔的一侧安装有脱氮塔再沸器，所述脱氮塔再沸器连通有混合冷剂二段节流阀、天然气过冷换热器和天然气液化换热器，所述天然气脱氮塔还与所述脱甲烷塔连通，所述脱甲烷塔再沸器与天然气过冷换热器和天然气液化换热器连通，所述混合冷剂二段节流阀分别与所述天然气液化换热器和天然气过冷换热器连通，所述天然气脱氮塔连通有天然气高温节流阀，所述天然气高温节流阀的另一端连通有天然气液化换热器，所述天然气液化换热器连通有重烃分离器，且所述重烃分离器与所述天然气高温节流阀连通。
优选的，所述天然气液化换热器连通有高压混合冷剂分离器和混合冷剂一级节流阀，所述混合冷剂一级节流阀与连通有天然气预冷换热器，所述混合冷剂一级节流阀的另一端与所述高压混合冷剂分离器连通，所述高压混合冷剂分离器还与所述天然气预冷换热器连通，所述天然气预冷换热器连通有第一混合冷剂压缩机，所述第一混合冷剂压缩机连通有混合冷剂段间冷却器，所述混合冷剂段间冷却器连通有混合冷剂段间分离器，所述混合冷剂段间分离器分别与所述混合冷剂增加泵和第二混合冷剂压缩机连通。
优选的，所述第二混合冷剂压缩机连通有混合冷剂末级冷却器，所述混合冷剂增加泵连通有混合冷剂末级冷却器，所述混合冷剂末级冷却器的另一端连通有混合冷剂末级分离器，所述混合冷剂末级分离器与所述天然气预冷换热器连通。
优选的，所述天然气预冷换热器连通有循环氮气压缩机，所述天然气预冷换热器还连通有闪蒸汽压缩机，且所述闪蒸汽压缩机连通有脱甲烷塔。
优选的，所述闪蒸汽分离器输出液氮并一部分液氮输入值所述粗氦冷凝器内，所述天然气预冷换热器输入有天然气并输出有重烃，所述循环氮气压缩机输出有氮气，且输出的氮气与所述天然气预冷换热器连通并输入至天然气预冷换热器内。
优选的，所述天然气预冷换热器输出有闪蒸汽至所述闪蒸汽压缩机，所述天然气预冷换热器输出有混合冷剂至所述第一混合冷剂压缩机内。
本发明的有益技术效果：
本发明提供的一种高含氮和含氦天然气液化及粗氦和氮提取系统，天然气放散少，氦气提取效率高、同时对天然气中的氮气提取生产液氮和氮气产品，经济效益好；
氮和氦等轻组分与天然气分离采用两塔分离，先进行天然气脱氮到安全含量，然后在脱甲烷塔中的甲烷在进行分离，其氮和氦等轻组分中甲烷含量可脱到1ppm以下，减少了甲烷的损失，提高了液化天然气的产量；
粗氦的提取采用冷凝分离的方法，同时对于溶解在液氮的氦等组分再进行节流闪蒸，然后通过闪蒸气压缩机压缩后直接进入脱甲烷塔回收，流程简化，可减少部分换热器的通道，使氦气提取率增加，液氮和氮气纯度进一步提高。其中液氮可供氦气精制使用，氮气可作为工厂所需氮气使用和混合冷剂循环系统的日常补充；
设置氮循环制冷系统，主要为脱甲烷塔的冷凝器和氦和氮冷凝分离提供冷量；
天然气的液化采用单一混合冷剂三级节流制冷，其中二级和三级冷剂分别为脱氮塔再沸器和脱甲烷塔再沸器提供热量，流程相对简单，能耗相对较低。
附图说明
图1为按照本发明的一种高含氮和含氦天然气液化及粗氦和氮提取系统的一优选实施例的工艺流程图。
图中：1-天然气预冷换热器，2-天然气液化换热器，3-天然气过冷换热器，4-重烃分离器，5-天然气高温节流阀，6-天然气低温节流阀，7-天然气脱氮塔，8-脱氮塔再沸器，9-脱甲烷塔，10-脱甲烷塔冷凝器，11-脱甲烷塔再沸器，12-脱甲烷塔冷凝分离器，13-粗氦冷凝器，14-粗氦分离器，15-第一液氮节流阀，16-闪蒸气分离器， 17-闪蒸气压缩机，18-循环氮气压缩机，19-液氮过冷器，20-循环氮节流阀，21-液氮蒸发压力控制阀，22-第二液氮节流阀，23-第一混合冷剂压缩机，24-混合冷剂段间冷却器，25-混合冷剂段间分离器，26-混合冷剂增压泵，27-混合冷剂末级冷却器，28-混合冷剂末级分离器，29-高压混合冷剂分离器，30-混合冷剂二段节流阀，31- 混合冷剂三级节流阀，32-混合冷剂一级节流阀，33-第二混合冷剂压缩机。
具体实施方式
为使本领域技术人员更加清楚和明确本发明的技术方案，下面结合实施例及附图对本发明作进一步详细的描述，但本发明的实施方式不限于此。
如图1所示，本实施例提供的一种高含氮和含氦天然气液化及粗氦和氮提取系统，包括粗氦冷凝器13，粗氦冷凝器13分别连通有第二液氮节流阀22、液氮过冷器19、粗氦分离器14和脱甲烷塔冷凝分离器12，粗氦分离器14分别连通有液氮过冷器19和第一液氮节流阀15，第一液氮节流阀15的另一端连通有闪蒸汽分离器16，闪蒸汽分离器16连通有液氮过冷器19，液氮过冷器19连通有液氮蒸发压力控制阀21，液氮蒸发压力控制阀21的另一端连通有脱甲烷塔冷凝器10，脱甲烷塔冷凝器10的一侧安装有脱甲烷塔9，脱甲烷塔9的另一侧安装有脱甲烷塔再沸器11，脱甲烷塔9与脱甲烷塔冷凝器10连通，脱甲烷塔冷凝分离器12分别与脱甲烷塔9和脱甲烷塔冷凝器10连通，脱甲烷塔冷凝器10连通有循环氮节流阀20，且循环氮节流阀20的另一端分别与第二液氮节流阀22和液氮过冷器 19连通，液氮过冷器19连通有天然气过冷换热器3，天然气过冷换热器3分别与混合冷剂三级节流阀31和天然气低温节流阀6连通，天然气低温节流阀6的另一端与天然气脱氮塔7连通，天然气脱氮塔7的一侧安装有脱氮塔再沸器8，脱氮塔再沸器8连通有混合冷剂二段节流阀30、天然气过冷换热器3和天然气液化换热器2，天然气脱氮塔7还与脱甲烷塔9连通，脱甲烷塔再沸器11与天然气过冷换热器3和天然气液化换热器2连通，混合冷剂二段节流阀30分别与天然气液化换热器2和天然气过冷换热器3连通，天然气脱氮塔7 连通有天然气高温节流阀5，天然气高温节流阀5的另一端连通有天然气液化换热器2，天然气液化换热器2连通有重烃分离器4，且重烃分离器4与天然气高温节流阀5连通。
图中：1-天然气预冷换热器，2-天然气液化换热器，3-天然气过冷换热器，4-重烃分离器，5-天然气高温节流阀，6-天然气低温节流阀，7-天然气脱氮塔，8-脱氮塔再沸器，9-脱甲烷塔，10-脱甲烷塔冷凝器，11-脱甲烷塔再沸器，12-脱甲烷塔冷凝分离器，13-粗氦冷凝器，14-粗氦分离器，15-第一液氮节流阀，16-闪蒸气分离器， 17-闪蒸气压缩机，18-循环氮气压缩机，19-液氮过冷器，20-循环氮节流阀，21-液氮蒸发压力控制阀，22-第二液氮节流阀，23-第一混合冷剂压缩机，24-混合冷剂段间冷却器，25-混合冷剂段间分离器，26-混合冷剂增压泵，27-混合冷剂末级冷却器，28-混合冷剂末级分离器，29-高压混合冷剂分离器，30-混合冷剂二段节流阀，31- 混合冷剂三级节流阀，32-混合冷剂一级节流阀，33-第二混合冷剂压缩机
经脱酸气、脱水和脱汞后的原料天然气依通过天然气预冷换热器1和天然气液化换热器2上部，然后与重烃分离器4相连，重烃分离器4底部的重烃依次通过天然气液化换热器2上部和天然气预冷换热器1去储存，重烃分离器4的顶部的天然气通过液化换热器2 后分为两股，一股通过天然气低温节流阀6与天然气脱氮塔7中部相连，另一股依次经过天然气过冷换热器3、天然气低温节流阀6 与天然气脱氮塔7顶部相连，天然气脱氮塔7塔底与脱氮塔再沸器8 相连，脱氮塔再沸器8底部LNG通过天然气过冷换热3去天然气液化储存装置，天然气脱氮塔7塔顶气与回收的闪蒸气一起与脱甲烷塔9中部相连，脱甲烷塔9塔顶气依次通过脱氮塔冷凝器10与甲烷塔冷凝分离器12相连，甲烷塔冷凝分离器12底部再与脱甲烷塔9 顶部相连；脱甲烷塔9塔底与蒸发器相连，蒸发器底部的天然气通过天然气过冷换热器去天然气液化储存装置，冷凝分离器顶部通过粗氦冷凝器与粗氦分离器相连。粗氦分离器顶部的粗氦依次通过液氮过冷器、天然气过冷换热器、天然气液化换热器和天然气预冷换热器去下游工序。粗氦分离器的底部通过节流阀与粗氦闪蒸罐相连，粗氦闪蒸罐顶部依次通过液氮过冷器、天然气过冷换热器、天然气液化换热器、天然气预冷换热器与闪蒸气压缩机进口相连，闪蒸气压缩机出口再与脱甲烷塔相连。氮气循环制冷系统中氮气循环压缩机出口的氮气依次通过天然气预冷换热器、天然气液化换热器、天然气过冷换热器和液氮过冷器后分为两股，一股通过节流阀与脱甲烷塔冷凝器相连，另一股通过节流阀与粗氦冷凝器相连，从脱甲烷塔冷凝器出来的循环氮气通过压力控制阀与从粗氦冷凝器出来循环氮气汇合后依次通过液氮过冷器、天然气过冷换热器、天然气液化换热器和天然气预冷换热器后氮循环压缩机入口相连。单一混合冷剂三级节流制冷循环中，混合冷剂末级分离器的液相冷剂通过天然气预冷换热器后与一级节流阀相连，混合冷剂末级分离器的气相冷剂通过天然气预冷换热器与高压冷剂分离器相连；高压冷剂分离器底部的液相混合冷剂依次通过天然气液化换热器、脱氮塔蒸发器与二级节流阀相连；高压冷剂分离器顶部的气相冷剂依次通过天然气液化换热器、脱甲烷塔再沸器、天然气过冷换热器与三级节流阀相连，从三级节流阀出来混合冷剂通过天然气过冷换热器与二级节流阀来的混合冷剂汇合后一起通过天然气液化换热器，然后再与一级节流阀来的混合冷剂汇合后通过天然气预冷换热器，然后与混合冷剂压缩机入口相连，混合冷剂压缩机一段出口通过混合冷剂段间冷却器与混合冷剂段间分离器相连；混合冷剂段间分离器顶部的气体冷剂与混合冷剂压缩机二段入口相连，混合冷剂段间分离器低部的液体冷剂与冷剂增压泵入口相连；冷剂增压泵出口液相冷剂与冷剂压缩机二段出口的气相冷剂汇合后通过混合冷剂末级冷却器与混合冷剂末级分离器相连，从而完成循环。
在本实施例中，天然气液化换热器2连通有高压混合冷剂分离器29和混合冷剂一级节流阀32，混合冷剂一级节流阀32与连通有天然气预冷换热器1，混合冷剂一级节流阀32的另一端与高压混合冷剂分离器29连通，高压混合冷剂分离器29还与天然气预冷换热器1连通，天然气预冷换热器1连通有第一混合冷剂压缩机23，第一混合冷剂压缩机23连通有混合冷剂段间冷却器24，混合冷剂段间冷却器24连通有混合冷剂段间分离器25，混合冷剂段间分离器25 分别与混合冷剂增加泵26和第二混合冷剂压缩机33连通。
在本实施例中，第二混合冷剂压缩机33连通有混合冷剂末级冷却器27，混合冷剂增加泵26连通有混合冷剂末级冷却器27，混合冷剂末级冷却器27的另一端连通有混合冷剂末级分离器28，混合冷剂末级分离器28与天然气预冷换热器1连通。
在本实施例中，天然气预冷换热器1连通有循环氮气压缩机18，天然气预冷换热器1还连通有闪蒸汽压缩机17，且闪蒸汽压缩机17 连通有脱甲烷塔9。
在本实施例中，闪蒸汽分离器16输出液氮并一部分液氮输入值粗氦冷凝器13内，天然气预冷换热器1输入有天然气并输出有重烃，循环氮气压缩机18输出有氮气，且输出的氮气与天然气预冷换热器 1连通并输入至天然气预冷换热器1内。
在本实施例中，天然气预冷换热器1输出有闪蒸汽至闪蒸汽压缩机17，天然气预冷换热器1输出有混合冷剂至第一混合冷剂压缩机23内。
以上，仅为本发明进一步的实施例，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明所公开的范围内，根据本发明的技术方案及其构思加以等同替换或改变，都属于本发明的保护范围。

Claims (6)

1.一种高含氮和含氦天然气液化及粗氦和氮提取系统，其特征在于：包括粗氦冷凝器(13)，所述粗氦冷凝器(13)分别连通有第二液氮节流阀(22)、液氮过冷器(19)、粗氦分离器(14)和脱甲烷塔冷凝分离器(12)，所述粗氦分离器(14)分别连通有液氮过冷器(19)和第一液氮节流阀(15)，所述第一液氮节流阀(15)的另一端连通有闪蒸汽分离器(16)，所述闪蒸汽分离器(16)连通有液氮过冷器(19)，所述液氮过冷器(19)连通有液氮蒸发压力控制阀(21)，所述液氮蒸发压力控制阀(21)的另一端连通有脱甲烷塔冷凝器(10)，所述脱甲烷塔冷凝器(10)的一侧安装有脱甲烷塔(9)，所述脱甲烷塔(9)的另一侧安装有脱甲烷塔再沸器(11)，所述脱甲烷塔(9)与所述脱甲烷塔冷凝器(10)连通，所述脱甲烷塔冷凝分离器(12)分别与所述脱甲烷塔(9)和脱甲烷塔冷凝器(10)连通，所述脱甲烷塔冷凝器(10)连通有循环氮节流阀(20)，且所述循环氮节流阀(20)的另一端分别与所述第二液氮节流阀(22)和液氮过冷器(19)连通，所述液氮过冷器(19)连通有天然气过冷换热器(3)，所述天然气过冷换热器(3)分别与混合冷剂三级节流阀(31)和天然气低温节流阀(6)连通，所述天然气低温节流阀(6)的另一端与天然气脱氮塔(7)连通，所述天然气脱氮塔(7)的一侧安装有脱氮塔再沸器(8)，所述脱氮塔再沸器(8)连通有混合冷剂二段节流阀(30)、天然气过冷换热器(3)和天然气液化换热器(2)，所述天然气脱氮塔(7)还与所述脱甲烷塔(9)连通，所述脱甲烷塔再沸器(11)与天然气过冷换热器(3)和天然气液化换热器(2)连通，所述混合冷剂二段节流阀(30)分别与所述天然气液化换热器(2)和天然气过冷换热器(3)连通，所述天然气脱氮塔(7)连通有天然气高温节流阀(5)，所述天然气高温节流阀(5)的另一端连通有天然气液化换热器(2)，所述天然气液化换热器(2)连通有重烃分离器(4)，且所述重烃分离器(4)与所述天然气高温节流阀(5)连通。
2.根据权利要求1所述的一种高含氮和含氦天然气液化及粗氦和氮提取系统，其特征在于：所述天然气液化换热器(2)连通有高压混合冷剂分离器(29)和混合冷剂一级节流阀(32)，所述混合冷剂一级节流阀(32)与连通有天然气预冷换热器(1)，所述混合冷剂一级节流阀(32)的另一端与所述高压混合冷剂分离器(29)连通，所述高压混合冷剂分离器(29)还与所述天然气预冷换热器(1)连通，所述天然气预冷换热器(1)连通有第一混合冷剂压缩机(23)，所述第一混合冷剂压缩机(23)连通有混合冷剂段间冷却器(24)，所述混合冷剂段间冷却器(24)连通有混合冷剂段间分离器(25)，所述混合冷剂段间分离器(25)分别与所述混合冷剂增加泵(26)和第二混合冷剂压缩机(33)连通。
3.根据权利要求2所述的一种高含氮和含氦天然气液化及粗氦和氮提取系统，其特征在于：所述第二混合冷剂压缩机(33)连通有混合冷剂末级冷却器(27)，所述混合冷剂增加泵(26)连通有混合冷剂末级冷却器(27)，所述混合冷剂末级冷却器(27)的另一端连通有混合冷剂末级分离器(28)，所述混合冷剂末级分离器(28)与所述天然气预冷换热器(1)连通。
4.根据权利要求1所述的一种高含氮和含氦天然气液化及粗氦和氮提取系统，其特征在于：所述天然气预冷换热器(1)连通有循环氮气压缩机(18)，所述天然气预冷换热器(1)还连通有闪蒸汽压缩机(17)，且所述闪蒸汽压缩机(17)连通有脱甲烷塔(9)。
5.根据权利要求4所述的一种高含氮和含氦天然气液化及粗氦和氮提取系统，其特征在于：所述闪蒸汽分离器(16)输出液氮并一部分液氮输入值所述粗氦冷凝器(13)内，所述天然气预冷换热器(1)输入有天然气并输出有重烃，所述循环氮气压缩机(18)输出有氮气，且输出的氮气与所述天然气预冷换热器(1)连通并输入至天然气预冷换热器(1)内。
6.根据权利要求1所述的一种高含氮和含氦天然气液化及粗氦和氮提取系统，其特征在于：所述天然气预冷换热器(1)输出有闪蒸汽至所述闪蒸汽压缩机(17)，所述天然气预冷换热器(1)输出有混合冷剂至所述第一混合冷剂压缩机(23)内。
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