吸附余压预冷的煤层气混合制冷剂液化流程  

Mixed-refrigerant cycle liquefaction process of coal-bed methane precooled by utilizing residue pressure of adsorption

作　　者：高婷[1] 林文胜[1] 顾安忠[1] 辜敏[2] 

机构地区：[1]上海交通大学制冷与低温工程研究所,上海200240 [2]重庆大学采矿工程系,重庆400044

出　　处：《化学工程》2010年第2期1-4,共4页Chemical Engineering(China)

基　　金：国家高技术研究发展计划(863计划)项目资助(2006AA06Z234)

摘　　要：煤层气(CBM)作为一种非常规的天然气,常常含有较多氮气,因此其液化方法也有所不同。文章提出了一种针对带压气源的新型吸附-液化一体化的煤层气混合制冷剂循环(MRC)液化流程。首先通过变压吸附实现氮/甲烷的分离,之后浓缩甲烷进入后续液化流程,而分离出的带余压氮气则直接膨胀对浓缩甲烷进行预冷。并根据浓缩甲烷预冷后不同的温度范围分别设计了3种MRC液化过程。通过HYSYS模拟优化得出了不同含氮摩尔分数及不同吸附余压下使MRC流程单位液化功最小的混合制冷剂配比,并比较了相应的一体化流程和不带预冷的普通MRC液化流程的系统单位产品液化功。结果表明,高含氮摩尔分数下,一体化流程能够大大地降低系统单位功耗。As a kind of unconventional natural gas, coal-bed methane （CBM） usually consists of a lot of nitrogen, so the liquefaction method is different. For CBM with some degree of pressure, a novel mixed-refrigerant cycle （MRC） liquefaction process was proposed, which integrates pressure of the waste nitrogen. Methane was firstly separated adsorption-liquefaction together by utilizing the residue from nitrogen by pressure-swing adsorption, and then the enriched methane was induced into the liquefaction process, while the released nitrogen was expanded directly to precool the enriched methane. Three different MRC liquefaction processes were designed based on the different ranges of temperature after precooling. Taking the unit product liquefaction power consumption as the major index, the optimum composition of mixed refrigerant was worked out with different nitrogen-containing mole fraction and different residue pressure of adsorption, and the system performance of corresponding processes was compared with that of the normal MRC liquefaction process without precooling. By simulation and calculation with HYSYS, it shows that for CBM with high nitrogen-containing mole fraction, the energy conservation effect of integration flow is significant.

关 键 词：煤层气 液化流程 混合制冷剂循环 吸附余压利用 

分 类 号：TD845[矿业工程—煤矿开采]