含氧煤层气低温脱氧液化工艺及安全分析

Liquefaction process of low temperature deoxygenation and its safety analysis for oxygen-bearing coal-bed methane

国内煤层气井下抽采利用率低,造成大量的煤层气资源排空浪费。针对含甲烷浓度低(以甲烷摩尔分数40%为例)的含氧煤层气,提出含氧煤层气开发利用的低温脱氧液化工艺流程,并给出流程计算结果和液化系统单位能耗;通过HYSYS对含氧煤层气低温脱氧液化工艺流程进行模拟,结合爆炸三角形理论,对工艺流程的安全性进行分析,指出含氧煤层气采用低温脱氧液化技术可能存在的安全隐患,并通过分析提出消除安全隐患的方法和措施,指导含氧煤层气低温脱氧液化工艺设计。

The low utilization of underground drainage results in venting of a great quantity of coalbed methane.In order to exploit oxygen-bearing coal-bed methane,a liquefaction process of low temperature deoxygenation for low methane concentration of coal-bed methane（methane concentration is 40%,for example）is proposed,and the calculation results and liquefaction unit energy consumption of the process are given.According to HYSYS simulation results and the explosion triangle theory,the safety of liquefaction process is analyzed,and possible safety risks and methods and measures to eliminate safety risks are proposed,and guide for coal-bed methane liquefaction process design is provided.