低投资成本的撬装式液化装置对于煤层气的开发利用十分重要,针对煤层气开发现状,提出液环泵加压煤层气的混合制冷剂循环液化新工艺,并分析计算了煤层气液化全流程中的爆炸极限,指出不同液化压力下,煤层气的安全液化极限低温不同,该极限温度随液化压力增加而升高。爆炸极限的分析为设计安全高效小型液化平台提供直接的理论参考。

Flammability Limits Analysis of Overall Liquefaction Process for Oxygen-bearing Coal-bed MethaneYU Guo-bao,LI Ting-xun,GUO Kai-hua,LIANG Dong (School of Engineering,Sun Yat-sen University,Guangzhou 510250,China)Low-cost skid-mounted liquefaction plane played important role in developing and exploiting coal-bed methane(CBM) resource in nowaday's China.For CBM exploitation & utilization,a new-technology oxygen-bearing CBM liquefaction system was raised in this paper,and in this system the CBM was pressurized by water-ring pump and refrigeration cycle was mixed refrigerant cycle driven by a screw compressor.The flammability limits of the overall cryogenic process were analyzed.The results indicated that there was a lowest temperature limit of the exhaust CBM fluid for each running respective pressure,and the limit would be higher corresponding to each higher pressure added by water-ring pump.The conclusions would make an important theoretical reference for designing a safe,efficient & low-cost small-scale CBM liquefaction plane.CBM;liquefaction;skid-mounted;water-ring pump;flammability