天然气调压站差压液化系统研究  

Study on differential pressure liquefaction system in natural gas pressure regulating station

作　　者：张泽国 陶加银 张怀韬 黄峰 葛磊 Zhang Zeguo;Tao Jiayin;Zhang Huaitao;Huang Feng;Ge Lei(Anhui Run-SpaceX Energy Technology Co.,Ltd.,Hefei 230071,China;R&D Center of System Engineering Department,Academy of Aerospace Propulsion Technology,Xian 710100,China)

机构地区：[1]安徽润安思变能源技术有限公司,合肥230071 [2]航天推进技术研究院系统工程部研发中心,西安710100

出　　处：《低温与超导》2023年第10期88-92,共5页Cryogenics and Superconductivity

基　　金：安徽省住建厅重点研发计划(2021-YF46)资助。

摘　　要：液化天然气(LNG)调峰方式因其调峰能力强,设备占地面积少等优点,是门站进行调压的有效补充。本文采用透平膨胀机替代传统的节流阀,设计了一套天然气差压液化系统,将管道的高压天然气进行降压后输送至城市管网,同时利用天然气膨胀后的冷能获得LNG。文章对比了压缩机不同布置方式对液化率的影响,在设计系统中采用气源入口布置压缩机以提高天然气液化率,文中研究了气源压力、温度及流量对透平膨胀流程天然气液化率的影响,发现液化率会随着气源压力和流量的增大而增大,但会随着温度的升高液化率降低。Liquefied natural gas(LNG)peak regulating mode is an effective supplement for pressure regulating at the gate station because of its strong peak regulating capacity and small equipment area.In this paper,turbine expander was used to replace the traditional throttle valve,and a set of natural gas pressure-differential liquefaction system was designed,after which the high-pressure natural gas in the pipeline was depressurized and transported to the urban pipe network.In the process,the cold energy after the natural gas expansion was utilized to obtain LNG.The influence of different compressor arrangement on liquefaction rate was compared.In the present system,the compressor was arranged near the inlet to improve the liquefaction rate of natural gas.Moreover,the effects of gas source pressure,temperature and flow rate on the liquefaction rate of natural gas in the turbine expansion process were studied.The results show that the liquefaction rate increases with the increase of gas source pressure and flow rate,while decreases with the increase of temperature.

关 键 词：天然气 压力能 回收 液化率 液化流程 

分 类 号：TE08[石油与天然气工程]