CN108775770A - 一种采用混合制冷剂循环的钎焊板式换热器天然气液化系统 - Google Patents
一种采用混合制冷剂循环的钎焊板式换热器天然气液化系统 Download PDFInfo
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 200
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000007789 gas Substances 0.000 claims abstract description 31
- 239000007788 liquid Substances 0.000 claims abstract description 30
- 239000003949 liquefied natural gas Substances 0.000 claims abstract description 26
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 20
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 20
- 239000012535 impurity Substances 0.000 claims abstract description 18
- 238000001816 cooling Methods 0.000 claims abstract description 17
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Classifications
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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
- F25J1/02—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
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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
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- F25J1/0257—Construction and layout of liquefaction equipments, e.g. valves, machines
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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
- 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
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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"
- 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
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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
- 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
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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
- F25J1/02—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
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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
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- F25J1/0257—Construction and layout of liquefaction equipments, e.g. valves, machines
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- F25J1/0264—Arrangement of heat exchanger cores in parallel with different functions, e.g. different cooling streams
- F25J1/0265—Arrangement of heat exchanger cores in parallel with different functions, e.g. different cooling streams comprising cores associated exclusively with the cooling of a refrigerant stream, e.g. for auto-refrigeration or economizer
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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Abstract
本发明公开了一种采用混合制冷剂循环的钎焊板式换热器天然气液化系统,经过脱水脱硫处理后的天然气进入预冷换热器,回收部分闪蒸汽冷量,在经过混合制冷剂预冷后进入气液分离器,将液化的重烃组分分离除去,气相部分回收剩余闪蒸汽冷量后进入液化换热器降温液化,经固液分离器将液化过程中凝结成固态的二氧化碳杂质除去,之后进入深冷换热器继续降温,最后节流降压至液化天然气存储压力后进入液化天然气储罐。本发明可实现二氧化碳杂质的低成本脱除,免除了常规液化天然气装置中的脱二氧化碳流程,简化了液化工艺、降低能耗、结构更加紧凑,可适用于不同压力和组分的气源。
Description
技术领域
本发明属于化工与低温工程技术领域,具体涉及一种采用混合制冷剂循环的钎焊板式换热器天然气液化系统。
背景技术
随着我国经济的不断发展,能源的需要量也在不断增长。为了优化我国的能源结构,同时减轻环境污染,我国在能源中长期计划中大力推广天然气的利用,据估计到2030年天然气在一次能源消费中的占比达到10%。
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,长期以来被点火炬放空。针对这种类型的气田,小型撬装式天然气液化流程与大中型相比具有设备简单紧凑,投资省,尺寸小型化,装置撬装化的优势。
常规天然气液化流程根据制冷方式的不同可以分为混合制冷剂液化流程、带膨胀机液化流程以及级联式液化流程这三类。现有的天然气液化工艺主要是适用于大中型天然气液化工厂的液化流程,如“一种中小型天然气液化工艺”,专利公开号CN102477327A,以及“一种用于零散起源点的沼气液化工艺及装置”,专利公开号CN102445052A,这些专利内涉及到的设备较多,流程复杂,不适用于小型撬装式天然气液化装置。
现有天然气液化流程目前广泛采用板翅式换热器,板翅式换热器的流道结构狭小,一旦原料天然气中的二氧化碳杂质在低温下凝结成固态就很容易将换热器流道阻塞,因此目前的基于板翅式换热器的常规天然气液化流程对于脱除二氧化碳的净化装置的要求非常高,也造成了净化成本的大幅上升。如果能够降低液化系统对二氧化碳脱除净化系统的严格限制和要求,就能大大降低净化成本,同时也能使液化装置的结构更加紧凑。
发明内容
本发明的目的在于实现上述设想,提供一种采用混合制冷剂循环的钎焊板式换热器天然气液化系统。该液化系统中,混合制冷剂采用一级气液分离,液化冷箱采用八个钎焊板式换热器,同时将二氧化碳杂质分离模块集成在液化冷箱内部,省去了常规天然气液化流程前脱碳装置,而由于钎焊板式换热器为不锈钢制成,与常规铝制板翅式换热器相比可以抗汞腐蚀,因此还能省去天然气液化流程前的脱汞装置,极大地减少了设备数量,节省了设备投资,同时还能兼顾闪蒸汽的冷量回收。
本发明的目的是通过以下技术方案来实现的:
第一方面,本发明涉及一种采用混合制冷剂循环的钎焊板式换热器天然气液化系统,其特征在于,所述系统包括天然气液化模块、二氧化碳杂质分离模块、制冷剂压缩模块、闪蒸汽冷量回收模块以及附属设备。
所述制冷剂压缩模块与天然气液化模块相连,构成制冷剂循环回路。
所述天然气液化模块与二氧化碳杂质分离模块、闪蒸汽冷量回收模块以及附属设备分别相连,实现天然气液化;
优选地,所述天然气液化模块包括:一级气相制冷剂预冷换热器、液相制冷剂预冷换热器、天然气预冷换热器、混合制冷剂分流器、一级混合制冷剂混合器、二级混合制冷剂混合器、液相制冷剂节流阀、制冷剂流量调节阀、二级气相制冷剂预冷换热器、气相制冷剂分流器、气相制冷剂节流阀、天然气液化换热器、重烃组分分离器、天然气深冷换热器和液化天然气节流阀。
优选地,所述制冷剂压缩模块包括一级压缩机、一级压缩机冷却器、二级压缩机、二级压缩机冷却器和制冷剂气液分离器。
优选地,所述二氧化碳杂质分离模块包括:固液分离器。
优选地,所述闪蒸汽冷量回收模块包括:一级闪蒸汽换热器和二级闪蒸汽换热器。
优选地,所述附属设备包括:液化天然气储存单元、LPG储存单元、制冷剂储存与配比单元、制氮单元、脱水脱硫单元、仪控单元以及发电机撬块。
优选地,所述二级闪蒸汽换热器天然气出口与天然气预冷换热器、重烃组分分离器依次相连,重烃组分分离器气相出口与一级闪蒸汽换热器、天然气液化换热器、固液分离器依次相连,固液分离器液相出口与天然气深冷换热器、液化天然气节流阀和液化天然气储罐依次相连。
优选地,所述制冷剂气液分离器液相出口与液相制冷剂预冷换热器、液相制冷剂节流阀和一级混合制冷剂混合器依次相连,所述制冷剂气液分离器气相出口与一级气相制冷剂预冷换热器、二级气相制冷剂预冷换热器及气相制冷剂分流器依次相连,制冷剂出分流器后分为两路,一路经过气相制冷剂节流阀、二级气相制冷剂预冷换热器后回到一级混合制冷剂混合器,另一路经过气相制冷剂节流阀、天然气深冷换热器、天然气液化换热器后回到一级混合制冷剂混合器,混合后的制冷剂经过混合制冷剂分流器后分为三路,分别经过制冷剂流量调节阀与一级气相制冷剂预冷换热器、液相制冷剂预冷换热器和天然气预冷换热器相连。
第二方面,本发明还涉及一种采用混合制冷剂循环的钎焊板式换热器天然气液化系统实现的液化方法,包括如下步骤:
A、经脱水脱硫单元后得到的净化天然气通过二级闪蒸汽换热器和天然气预冷换热器预冷后进入重烃组分分离器,除去重烃后的天然气进入一级闪蒸汽换热器继续降温,随后进入天然气液化换热器液化,经固液分离器脱除固态二氧化碳杂质,通过天然气深冷换热器后经液化天然气节流阀降压至液化天然气储存压力,进入液化天然气储罐;
B、混合制冷剂经制冷剂压缩模块增压、冷却、气液分离,进入混合制冷剂气液分离器,分离出的液相制冷剂经液相制冷剂预冷换热器预冷后通过液相制冷剂节流阀降压,之后进入一级混合制冷剂混合器,分离出的气相制冷剂通过一级气相制冷剂预冷换热器和二级气相制冷剂预冷换热器预冷后经气相制冷剂分流器分为两路,一路经过气相制冷剂节流阀、二级气相制冷剂预冷换热器后回到一级混合制冷剂混合器,另一路经过气相制冷剂节流阀、天然气深冷换热器、天然气液化换热器后回到一级混合制冷剂混合器,混合后的制冷剂经过混合制冷剂分流器后分为三路,分别经过制冷剂流量调节阀进入一级气相制冷剂预冷换热器、液相制冷剂预冷换热器和天然气预冷换热器提供冷量,之后三个换热器的制冷剂进入二级混合制冷剂混合器混合后回制冷剂压缩模块,完成液化循环。
优选地,步骤A中,所述液化天然气储存压力为0.1MPa。
优选地,步骤A中,进入该天然气液化系统的净化天然气的压力需高于4.0MPa。
优选地,步骤B中,所述混合制冷剂组分为甲烷、丙烷、异丁烷、氮气和乙烯。
与现有技术相比,本发明具有如下有益效果:
1、本发明所述的采用混合制冷剂循环的钎焊板式换热器天然气液化系统将二氧化碳杂质分离模块集成于液化系统中,省去了常规天然气液化系统的脱碳脱汞设备,减少了液化系统的设备数量,大大降低除杂成本。
2、通过化工行业广泛采用的HYSYS软件的模拟计算,证实本液化工艺能耗低,可实现二氧化碳杂质的低成本脱除、并适用于不同压力和组分的气源。液化工艺的日处理量为5000~50000Nm3。
当然,实施本发明的任一产品并不一定需要同时达到以上所述的所有优点。
附图说明
为了更清楚地说明本发明实施例的技术方案,下面将对实施例描述所需要使用的附图作简单地介绍,显而易见地,下面描述中的附图仅仅是本发明的一些实施例,对于本领域普通技术人员来讲,在不付出创造性劳动的前提下,还可以根据这些附图获得其他的附图。
图1为采用混合制冷剂循环的钎焊板式换热器天然气液化系统工艺流程图;
其中,1为一级压缩机,2为一级压缩机冷却器,3为二级压缩机,4为二级压缩机冷却器,5为制冷剂气液分离器,6为二级闪蒸汽换热器,7为二级制冷剂混合器,8为气相制冷剂预冷换热器,9为液相制冷剂预冷换热器,10为天然气预冷换热器,11为一级闪蒸汽换热器,12为混合制冷剂分流器,13为一级制冷剂混合器,14为液相制冷剂节流阀,15、16、17为流量调节阀,18为二级气相制冷剂预冷换热器,19、23为气相制冷剂节流阀,20为气相制冷剂分流器,21为天然气液化换热器,22为重烃组分分离器,24为固液分离器,25为天然气深冷换热器,26为液化天然气节流阀,27为液化天然气储罐。
具体实施方式
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其它实施例,都属于本发明保护的范围。
根据本发明提供的采用混合制冷剂循环的钎焊板式换热器天然气液化系统包括天然气液化模块、二氧化碳杂质分离模块、制冷剂压缩模块、闪蒸汽冷量回收模块以及附属设备。所述制冷剂压缩模块与天然气液化模块相连,构成制冷剂循环回路。所述天然气液化模块与二氧化碳杂质分离模块、闪蒸汽冷量回收模块以及附属设备分别相连,实现天然气液化。
所述天然气液化模块包括:一级气相制冷剂预冷换热器8、液相制冷剂预冷换热器9、天然气预冷换热器10、混合制冷剂分流器12、一级混合制冷剂混合器13、二级混合制冷剂混合器7、液相制冷剂节流阀14、制冷剂流量调节阀15、16、17、二级气相制冷剂预冷换热器18、气相制冷剂分流器20、气相制冷剂节流阀19、23、天然气液化换热器21、重烃组分分离器22、天然气深冷换热器25和液化天然气节流阀26。
所述制冷剂压缩模块包括一级压缩机1、一级压缩机冷却器2、二级压缩机3、二级压缩机冷却器4和制冷剂气液分离器5。
所述二氧化碳杂质分离模块包括:固液分离器24。
所述闪蒸汽冷量回收模块包括:一级闪蒸汽换热器11和二级闪蒸汽换热器6。
所述附属设备包括:液化天然气储存单元、LPG储存单元、制冷剂储存与配比单元、制氮单元、脱水脱硫单元、仪控单元以及发电机撬块。
根据本发明提供的采用混合制冷剂循环的钎焊板式换热器天然气液化系统实现的液化方法,包括如下步骤:
步骤A:经脱水脱硫单元后得到的净化天然气通过二级闪蒸汽换热器6和天然气预冷换热器10预冷后进入重烃组分分离器22,除去重烃后的天然气进入一级闪蒸汽换热器11继续降温,随后进入天然气液化换热器21液化,经固液分离器24脱除固态二氧化碳杂质,通过天然气深冷换热器25后经液化天然气节流阀26降压至液化天然气储存压力,进入液化天然气储罐27;
步骤B:混合制冷剂经制冷剂压缩模块增压、冷却、气液分离,进入混合制冷剂气液分离器5,分离出的液相制冷剂经液相制冷剂预冷换热器9预冷后通过液相制冷剂节流阀14降压,之后进入一级混合制冷剂混合器13,分离出的气相制冷剂通过一级气相制冷剂预冷换热器8和二级气相制冷剂预冷换热器18预冷后经气相制冷剂分流器20分为两路,一路经过气相制冷剂节流阀19、二级气相制冷剂预冷换热器18后回到一级混合制冷剂混合器13,另一路经过气相制冷剂节流阀23、天然气深冷换热器25、天然气液化换热器21后回到一级混合制冷剂混合器13,混合后的制冷剂经过混合制冷剂分流器12后分为三路,分别经过制冷剂流量调节阀15、16、17进入一级气相制冷剂预冷换热器8、液相制冷剂预冷换热器9和天然气预冷换热器10提供冷量,之后三个换热器的制冷剂进入二级混合制冷剂混合器7混合后回制冷剂压缩模块,完成循环。
所述步骤A中,所述液化天然气储存压力为0.1MPa。
所述步骤A中,进入该天然气液化系统的净化天然气的压力需高于4.0MPa。
所述步骤B中,所述混合制冷剂组分为甲烷、丙烷、异丁烷、氮气和乙烯。
需要理解的是,本发明并不局限于上述的特定实施方式,本领域技术人员可以在权利要求书的范围内做出各种变化或修改,而不影响本发明的实质内容。
在不冲突的情况下,本申请的实施方式中的特征可以任意相互组合。
在本说明书的描述中,参考术语“一个实施例”、“示例”、“具体示例”等的描述意指结合该实施例或示例描述的具体特征、结构、材料或者特点包含于本发明的至少一个实施例或示例中。在本说明书中,对上述术语的示意性表述不一定指的是相同的实施例或示例。而且,描述的具体特征、结构、材料或者特点可以在任何的一个或多个实施例或示例中以合适的方式结合。
以上公开的本发明优选实施例只是用于帮助阐述本发明。优选实施例并没有详尽叙述所有的细节,也不限制该发明仅为所述的具体实施方式。显然,根据本说明书的内容,可作很多的修改和变化。本说明书选取并具体描述这些实施例,是为了更好地解释本发明的原理和实际应用,从而使所属技术领域技术人员能很好地理解和利用本发明。本发明仅受权利要求书及其全部范围和等效物的限制。
Claims (10)
1.一种采用混合制冷剂循环的钎焊板式换热器天然气液化系统,其特征在于,所述系统包括天然气液化模块、二氧化碳杂质分离模块、制冷剂压缩模块、闪蒸汽冷量回收模块以及附属设备。
所述制冷剂压缩模块与天然气液化模块相连,构成制冷剂循环回路。
所述天然气液化模块与二氧化碳杂质分离模块、闪蒸汽冷量回收模块以及附属设备分别相连,实现天然气液化。
2.根据权利要求1所述的采用混合制冷剂循环的钎焊板式换热器天然气液化系统,其特征在于,所述天然气液化模块包括:一级气相制冷剂预冷换热器(8)、液相制冷剂预冷换热器(9)、天然气预冷换热器(10)、混合制冷剂分流器(12)、一级混合制冷剂混合器(13)、二级混合制冷剂混合器(7)、液相制冷剂节流阀(14)、制冷剂流量调节阀(15、16、17)、二级气相制冷剂预冷换热器(18)、气相制冷剂分流器(20)、气相制冷剂节流阀(19、23)、天然气液化换热器(21)、重烃组分分离器(22)、固液分离器(24)、天然气深冷换热器(25)和液化天然气节流阀(26)。
3.根据权利要求1所述的采用混合制冷剂循环的钎焊板式换热器天然气液化系统,其特征在于,所述二氧化碳杂质分离模块包括:固液分离器(24)。
4.根据权利要求1所述的采用混合制冷剂循环的钎焊板式换热器天然气液化系统,其特征在于,所述闪蒸汽冷量回收模块包括:一级闪蒸汽换热器(11)和二级闪蒸汽换热器(6)。
5.根据权利要求1至4所述的采用混合制冷剂循环的钎焊板式换热器天然气液化系统,其特征在于,所述二级闪蒸汽换热器(6)天然气出口与天然气预冷换热器(10)、重烃组分分离器(22)依次相连,重烃组分分离器(22)气相出口与一级闪蒸汽换热器(11)、天然气液化换热器(21)、固液分离器(24)依次相连,固液分离器(24) 液相出口与天然气深冷换热器(25)、液化天然气节流阀(26)和液化天然气储罐(27)依次相连。
6.根据权利要求1所述的采用混合制冷剂循环的钎焊板式换热器天然气液化系统,其特征在于,所述制冷剂气液分离器(5)液相出口与液相制冷剂预冷换热器(9)、液相制冷剂节流阀(14)和一级混合制冷剂混合器(13)依次相连,所述制冷剂气液分离器(5)气相出口与一级气相制冷剂预冷换热器(8)、二级气相制冷剂预冷换热器(18)及气相制冷剂分流器(20)依次相连,制冷剂经气相制冷剂分流器(20)分为两路,一路经过气相制冷剂节流阀(19)、二级气相制冷剂预冷换热器(18)后回到一级混合制冷剂混合器(13),另一路经过气相制冷剂节流阀(23)、天然气深冷换热器(25)、天然气液化换热器(21)后回到一级混合制冷剂混合器(13),混合后的制冷剂经过混合制冷剂分流器(12)后分为三路,分别经过制冷剂流量调节阀(15、16、17)与一级气相制冷剂预冷换热器(8)、液相制冷剂预冷换热器(9)和天然气预冷换热器(10)相连。
7.根据权利要求1所述的采用混合制冷剂循环的钎焊板式换热器天然气液化系统实现的液化方法,包括如下步骤:
A、经脱水脱硫单元后得到的净化天然气通过二级闪蒸汽换热器(6)和天然气预冷换热器(10)预冷后进入重烃组分分离器(22),除去重烃后的天然气进入一级闪蒸汽换热器(11)继续降温,随后进入天然气液化换热器(21)液化,经固液分离器(24)脱除固态二氧化碳杂质,通过天然气深冷换热器(25)后经液化天然气节流阀(26)降压至液化天然气储存压力,进入液化天然气储罐(27);
B、混合制冷剂经制冷剂压缩模块增压、冷却,进入混合制冷剂气液分离器(5),分离出的液相制冷剂经液相制冷剂预冷换热器(9)预冷后通过液相制冷剂节流阀(14)降压,之后进入一级混合制冷剂混合器(13);分离出的气相制冷剂通过一级气相制冷剂预冷换热器(8)和二级气相制冷剂预冷换热器(18)预冷后经气相制冷剂分流器(20)分为两路,一路经过气相制冷剂节流阀(19)、二级气相制冷剂预冷换热器(18)后回到一级混合制冷剂混合器(13),另一路经过气相制冷剂节流阀(23)、天然气深冷换热器(25)、天然气液化换热器(21)后回到一级混合制冷剂混合器(13),混合后的制冷剂经过混合制冷剂分流器(12)后分为三路,分别经过制冷剂流量调节阀(15、16、17)进入一级气相制冷剂预冷换热器(8)、液相制冷剂预冷换热器(9)和天然气预冷换热器(10)提供冷量,之后三个换热器的制冷剂进入二级混合制冷剂混合器(7)混合后回制冷剂压缩模块,完成液化循环。
8.根据权利要求7所述的液化天然气的方法,其特征在于,步骤A中,所述液化天然气储存压力为0.1MPa。
9.根据权利要求7所述的液化天然气的方法,其特征在于,步骤A中,进入该天然气液化系统的净化天然气的压力需高于4.0MPa。
10.根据权利要求7所述的液化天然气的方法,其特征在于,步骤B中,所述混合制冷剂组分为甲烷、丙烷、异丁烷、氮气和乙烯。
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