摘要
高压输气管线和沿线城市配气管网之间压差较大,可利用该压差建立小型膨胀制冷液化天然气装置供城市燃气调峰或供LNG加气站使用。利用ASPEN HYSYS软件模拟分析了影响该流程及液化率的主要因素,得出:压缩机位置的选择取决于原料气压力的大小;随着液化天然气储存压力的增加液化率增大;原料气中CH4等轻组分含量减小、C3+等重组分含量增大时天然气液化率增大;当原料气压力较小(<3.5 MPa)时随着原料气压力的增大液化率显著增大,当原料气压力较大(>3.5 MPa)时随着进料压力增大天然气液化率增大不明显;随着原料气温度升高天然气液化率降低;最小分流比下液化率达到最大,且随着液化部分天然气的增大液化率近似线性减小。最后根据研究分析结论优化了工艺方案。
High pressure gas transmission pipeline and city gas distribution pipeline network along the gas pipeline have high pressure differential,such high pressure differential can be used to build small expansion refrigeration LNG unit for city gas peak shaving or LNG injection.Used is ASPEN HYSYS simulation software to analyze main factors affecting the process and liquefaction rate(coaxial expander compressor position,liquefied natural gas storage pressure,the ratio of expansion gas as the cold source to feed gas,feed gas composition,pressure and temperature)and optimized is the process program.
出处
《天然气与石油》
2013年第4期33-36,8,共4页
Natural Gas and Oil
关键词
液化天然气
管道压差
膨胀
流程
模拟
Liquefied natural gas(LNG)
Pipeline pressure differential
Expansion
Technological process
Simulation
