煤制合成天然气甲烷化反应中试研究

Pilot study on the methanation of synthetic nature gas from coal

采用自主技术建成了100 m^3/h煤制合成天然气中试装置,装填使用自主研发的NCJ-1型宽温合成天然气催化剂及NCJ-2型低温合成天然气催化剂,利用工业原料气进行了2 000 h的运行试验。考察了反应器一的入口温度、系统压力、新鲜气CH_4含量、干气循环比、干气空速、压缩机入口温度等工艺条件对甲烷化反应的影响。试验结果表明:降低入口温度,增加系统压力,提高新鲜气CH_4含量,增加干气循环比,降低空速有利于甲烷化反应的进行,其中,反应器一的入口温度为280℃,系统压力为2.9 MPa,新鲜气CH_4体积分数为11%～13%,干气循环比为1.6～1.8,干气空速为7 000～9 000 h^(-1)时工艺条件最优,产出了符合国家管输标准要求的合成天然气。

A pilot plant of 100 m^3 /h coal based synthetic natural gas is built with self-developed NCJ-1 wide temperature synthesis catalyst and NCJ-2 low temperature synthesis catalyst. The operation test is carried out for 2 000 hours using industrial raw gas. The effects of process conditions including the inlet temperature, system pressure, fresh gas CH 4 content, dry gas circulation ratio, dry gas space velocity and inlet temperature of compressor on the methanation are investigated respectively. The results show that it is good for methanation by reducing inlet temperature, increasing the system pressure, improving fresh gas CH 4 content, increasing the dry gas circulation ratio and reducing space velocity. The optimum process conditions are obtained when the inlet temperature is 280 ℃, the system pressure is 2.9 MPa, the fresh gas CH 4 volume fraction is 11%-13%, the dry gas circulation ratio is 1.6-1.8, and the dry gas space velocity is 7 000-9 000 h ^-1 . The synthetic natural gas which can meet the requirements of the national pipeline transportation standard is produced.