CN213657266U - 一种lng制备液氢的撬装装置 - Google Patents

一种lng制备液氢的撬装装置 Download PDF

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CN213657266U
CN213657266U CN202022694962.5U CN202022694962U CN213657266U CN 213657266 U CN213657266 U CN 213657266U CN 202022694962 U CN202022694962 U CN 202022694962U CN 213657266 U CN213657266 U CN 213657266U
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hydrogen
lng
natural gas
communicated
lithium bromide
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王秀林
侯建国
穆祥宇
宋鹏飞
赵思思
张瑜
姚辉超
侯海龙
隋依言
尹全森
王斯
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China National Offshore Oil Corp CNOOC
CNOOC Gas and Power Group Co Ltd
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CNOOC Gas and Power Group Co Ltd
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Abstract

本实用新型公开了一种LNG制备液氢的撬装装置。所述撬装装置包括LNG升温单元、天然气转换单元和氢气液化单元；LNG升温单元包括依次连接的LNG换热器和LNG汽化器；天然气转换单元包括依次连接的天然气转化器、天然气变换器和变压吸附器；LNG汽化器与天然气转化器连通；氢气液化单元包括溴化锂冷却器和氢气液化器；溴化锂冷却器的氢气入口与变压吸附器的富氢气体出口连通，溴化锂冷却器的氢气出口与LNG汽化器的氢气入口连通，LNG汽化器的氢气出口与氢气液化器连通，氢气液化器的出口得到液氢；LNG换热器和氢气液化器均与He与Ar的混合物进行换热。本实用新型直接将LNG气化工艺与氢气液化工艺能量相互利用，制备的液氢可方便进行运输和利用，提高氢气的运输消耗和氢气经济性。

Description

一种LNG制备液氢的撬装装置
技术领域
本实用新型涉及一种LNG制备液氢的撬装装置。
背景技术
氢能是公认的清洁能源，因具有高能量密度以及零碳排放等优点被认为是未来最有潜力的化石燃料替代者，其被看作是以氢燃料电池汽车为代表的移动能源领域的“终极方案”，绿色的氢气也可以作为化石资源加氢过程的氢气来源，实现碳的减排。氢能作为新的二次能源将在低碳减排、未来绿色能源体系中发挥重要作用。国际氢能委员会预计2050年氢能将占能源消费的18％。到2050年，氢能在我国能源结构中占比有望达到10％以上。
美国、日本、加拿大、欧盟等都制定了氢能发展规划，目前我国各级政府也高度重视氢能产业发展，已经形成自上而下的政策支持体系。目前，影响氢能产业发展的关键因素是氢气的价格，氢气价格决定氢气利用的经济性，进而决定了整个产业的经济性和可行性。氢能产业包括制氢、氢气储运和氢气利用三个主要环节，其中高效制氢技术和降低氢气运行成本是实现氢能产业发展的关键。
发明内容
针对氢气液化能耗高、液氢制造成本的问题，本实用新型提供了一种利用LNG冷能制备液化氢气的撬装装置，得到的氢气浓度大于99.9％；本实用新型将LNG气化装置和氢气液化装置能量相互利用，工艺简单、自动化程度高、操作方便，能够很好地解决氢气液化能耗的问题。
具体地，本实用新型所提供的一种新型LNG制备液氢的撬装装置，包括LNG升温单元、天然气转换单元和氢气液化单元；
所述LNG升温单元包括依次连接的LNG换热器和LNG汽化器；
所述天然气转换单元包括依次连接的天然气转化器、天然气变换器和变压吸附器；所述LNG汽化器与所述天然气转化器连通；
所述氢气液化单元包括溴化锂冷却器和氢气液化器；所述溴化锂冷却器的氢气入口与所述变压吸附器的富氢气体出口连通，所述溴化锂冷却器的氢气出口与所述LNG汽化器的氢气入口连通，所述LNG汽化器的氢气出口与所述氢气液化器连通，所述氢气液化器的出口得到液氢；
所述LNG换热器和所述氢气液化器均与He与Ar的混合物进行换热，所述混合物中Ne的浓度范围可为5％～90％；
所述混合物的冷却温度可为-120～-157℃。
所述LNG升温单元中，所述LNG换热器的入口端连接LNG增压泵，以对低温LNG进行增压，如增压至0.3～10MPaG；
通过所述升温单元，可将LNG升温至-100～0℃，而使氢气降低至-60～-150℃。
所述天然气转换单元中，所述天然气转化器的入口端连接燃烧炉，可将天然气加热至600℃～1000℃；
所述天然气转换单元得到的富氢气体中氢气的浓度大于99.9％。
所述氢气液化单元中，所述溴化锂冷却器的氢气入口端依次连接冷却器、气体缓冲罐和压缩机；经所述压缩机将富氢气体增压至0.5～5.0MPAG，然后经所述溴化锂冷却器冷却至-20℃～20℃。
在溴化锂预冷工段中，溴化锂增压至0.5～3MPAG后，经冷却后的所述溴化锂节流换热后继续增压而循环使用。
本实用新型装置直接将LNG气化工艺与氢气液化工艺能量相互利用，制备的液氢可方便进行运输和利用，提高氢气的运输消耗和氢气经济性，本实用新型装置的自动化程度高，所采用的设备可靠，提高氢气的制备成本和液化成本，经济效益显著。
附图说明
图1为本实用新型LNG制备液氢的装置的结构示意图。
具体实施方式
下面结合附图对本实用新型做进一步说明，但本实用新型并不局限于以下实施例。
如图1所示，按照制备液氢的过程说明本实用新型装置的结构：
1、LNG储罐V100内的LNG经LNG增压泵P-100增压后的LNG(8.0MPaG)进入LNG换热器LNG-103中与(He+Ar)换热后温度为-130℃(物流2-4-5)。
2、经LNG换热器LNG-103换热后的天然气进LNG汽化器LNG-100与氢气换热，换热后天然气温度为5℃(物流5-6)。
3、换热后的天然气经燃烧炉E-101加热到800℃后进入天然气转化器GBR-100(物流6-7-9)。
4、天然气分别通过转化器GBR-100、变换器GBR-101和变压吸附器X-100提浓后，制备氢气浓度大于99.9％的富氢气体混合物(物流9-10-12-14)；弛放气(物流15)外排***。
5、富氢气体混合物经冷却器E-102冷却到5℃后，经气体缓冲罐V-104缓冲，压缩机K-100增压(4.0MPaG)后，在溴化锂冷却器LNG-101冷却(-10℃)(物流14-16-17-10-20)。
6、溴化锂冷却器LNG-101出口的氢气进入LNG汽化器LNG-100换热冷却(氢气温度-160℃)后，进入氢气液化器LNG-102与(He+Ar)混合物(Ne的浓度为50％)进行换热冷却到-250℃(物流20-8-21)。
7、经氢气液化器冷却后的氢气(压力3.65MPaG，温度-257℃)经节流阀节流后，制备液氢。
8、溴化锂预冷装置中，溴化锂经压缩机K-101增压至0.8MPAG后，经溴化锂换热器E-103冷却、节流、溴化锂冷却器LNG-101换热后继续增压而循环使用(27-3-29-27)。

Claims (4)

1.一种LNG制备液氢的撬装装置，其特征在于：所述装置包括LNG升温单元、天然气转换单元和氢气液化单元；
所述LNG升温单元包括依次连接的LNG换热器和LNG汽化器；
所述天然气转换单元包括依次连接的天然气转化器、天然气变换器和变压吸附器；所述LNG汽化器与所述天然气转化器连通；
所述氢气液化单元包括溴化锂冷却器和氢气液化器；所述溴化锂冷却器的氢气入口与所述变压吸附器的富氢气体出口连通，所述溴化锂冷却器的氢气出口与所述LNG汽化器的氢气入口连通，所述LNG汽化器的氢气出口与所述氢气液化器连通，所述氢气液化器的出口得到液氢；
所述LNG换热器和所述氢气液化器均与He与Ar的混合物进行换热。
2.根据权利要求1所述的撬装装置，其特征在于：所述LNG升温单元中，所述LNG换热器的入口端连接LNG增压泵。
3.根据权利要求1或2所述的撬装装置，其特征在于：所述天然气转换单元中，所述天然气转化器的入口端连接燃烧炉。
4.根据权利要求1或2所述的撬装装置，其特征在于：所述氢气液化单元中，所述溴化锂冷却器的氢气入口端依次连接冷却器、气体缓冲罐和压缩机。
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