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利用液氮冷能的小型天然气液化流程
引用本文:郑宗和,郭汇江,王卫晓,纪超.利用液氮冷能的小型天然气液化流程[J].低温与超导,2013,41(4).
作者姓名:郑宗和  郭汇江  王卫晓  纪超
作者单位:1. 天津大学机械工程学院中低温热能高效利用教育部重点实验室,天津,300072
2. 中海油天津液化天然气有限责任公司,天津,300450
3. 公安部天津消防研究所,天津,300381
摘    要:为了简化小型天然气液化流程中的制冷装置,增加产品的收益率,设计了一种利用液氮冷能且带精馏的天然气液化流程,在得到液化天然气(LNG)的同时得到液化石油气(LPG)。采用HYSYS软件对流程进行模拟,选取P-R方程计算天然气气液相平衡特性,以生产单位质量的LNG耗功最小为目标函数进行优化,得到了关键节点参数,主要分析了塔内工作状况和换热器管路的热负荷分布情况。结果表明:塔的操作压力对产品纯度影响很大,换热器过大的温差和负荷造成了主要的火用损失,LNG回收率大于90%。

关 键 词:热工学  天然气液化  精馏  液氮  液化流程

The small natural gas liquefaction process using liquid nitrogen
Zheng Zonghe , Guo Huijiang , Wang Weixiao , Ji Chao.The small natural gas liquefaction process using liquid nitrogen[J].Cryogenics and Superconductivity,2013,41(4).
Authors:Zheng Zonghe  Guo Huijiang  Wang Weixiao  Ji Chao
Abstract:In order to simplify the refrigerating equipment of small-scale natural gas liquefaction process and increase the product yield rate,a natural gas liquefaction process with distillation using the cold energy of liquid nitrogen was designed so that the liquefied natural gas(LNG) and the liquefied petrol gas(LPG) could be gotten at the same time in this technology.The HYSYS software was adapted to simulate the process;P-R equation was selected to calculate the phase equilibrium properties of the natural gas.The process is optimized through the objective function that is the minimum power consumption in obtaining unit quality LNG production.The simulative calculation of the small scale LNG project achieved the key node parameters and the column operation condition.The load and temperature distribution in heat exchanger were analyzed.The results indicate that operating pressure of the tower has a great influence on the purity of the product,large temperature difference and heat exchange load are the primary reasons of exergy loss in heat exchangers,and the LNG recovery rate is over 90%.
Keywords:Pyrology  Liquefied natural gas  Distillation  Liquid nitrogen  Flow sheet
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