PFHE型五级液氮预冷氢膨胀与四级氦膨胀氢液化工艺研究  

Research on H_(2) liquefaction process of H_(2) expansion with pre-cooling by LN_(2) in five-stage PFHE&H_(e) expansion in four-stage PFHE

作　　者：李文振 张周卫 樊翔宇 刘要森 Li Wenzhen;Zhang Zhouwei;Fan Xiangyu;Liu Yaosen(School of Environment and Municipal Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;Research Institute of LNG cryogenic equipment and Automation,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]兰州交通大学环境与市政工程学院,兰州730070 [2]兰州交通大学LNG低温装备及自动化研究所,兰州730070

出　　处：《低温工程》2022年第2期14-21,共8页Cryogenics

基　　金：国家自然科学基金项目(51666008);甘肃省重点人才项目(26600101);甘肃省高等学校产业支撑计划项目(2020C-22)。

摘　　要：研究了以板翅式换热器(PFHE)为核心的30万方/天五级液氮(LN_(2))预冷氢膨胀制冷氢液化系统和四级氦膨胀制冷氢液化系统的原理和工艺流程,两种氢液化工艺均可将氢气液化为-252℃的液氢(LH_(2));给出了两种氢液化工艺具体参数和主液化装备板翅式换热器的设计计算方法;借助制冷效率、压力损失等主要参数理论计算和两种工艺的特点进行优劣对比。研究表明:针对30万方/天PFHE型氢液化工艺,液氮预冷氢膨胀制冷氢液化工艺制冷效率高、压力损失少、集约性好、可同时制取液氢和液氮两种低温工质,但系统工艺复杂,设备数量众多;氦膨胀制冷氢液化工艺流程简单,功能单一,但集约性差。30×10^(4)Nm^(2)/d H_(2)liquefaction process of H_(2)expansion with pre-cooling by liquid nitrogen(LN_(2)) in five-stage plate-fin heat exchanger(PFHE) & H_(2)expansion in four-stage PFHE was researched.Both liquefaction processes can liquefy H_(2)to liquid hydrogen(LH_(2)) in-252℃.The specific process parameters of the two H_(2)processes and the design and calculation methods of the main PFHEs were given separately.The advantages and disadvantages of the two processes were compared by the theoretical calculation of main parameters such as refrigeration efficiency and pressure loss.Based on 30×10^(4)Nm^(2)/d H_(2)liquefaction process,the result shows the process of H_(2)expansion with pre-cooling by LN_(2)in five-stage PFHE has the advantages of high refrigeration efficiency,less pressure loss and good intensification,which can produce LN_(2)and LH_(2)at the same time,but the system process is complex and the number of equipment is large.The process of H_(2)expansion in four-stage PFHE is simple,single function,but poor intensification.

关 键 词：氢液化 板翅式换热器 氢膨胀制冷 氦膨胀制冷 

分 类 号：TB661[一般工业技术—制冷工程]