用煤层气(CMM)生产甲醇的探讨

Probing into Methanol Production from CMM

本文提出了一种利用矿井区煤层气(CMM)生产甲醇的方法。经过脱硫后的煤层气,在催化剂存在下进行自热转化和外加热转化,得到的H2、CO2、CO,少量CH4和N2的混合气,利用二段变压吸附分离技术脱除氮气,得到含CO、CO2、少量N2气和含98%以上H2气的两股气,混合后得到甲醇的合成气。加压后,送入甲醇合成工序。以含40%甲烷的煤层气为原料,每吨甲醇脱氮费用约224元,具有较好的经济效益和社会效益。

A method of methanol production from Coal mine methane （CMM） is discussed. After desulfurization, auto-thermal reforming and external-thermal reforming by catalysts, the CMM is converted into a mixture gas, which is made up of H2, CO2, CO and a little of CH4 and N2. By two-stage pressure swing adsorption, N2 is removed from the mixture gas and two product gases are produced, one containing CO, CO2 and a small quantity of N2, the other containing more than 98% （φ）H2. By mixing the product gases together, a synthetic gas for methanol is produced and transported to synthesis procedure after compression. Utilizing CMM of 40% CH4 as raw material, the cost of removing N2 is about 224￥ per ton methanol, so the technology can yield good economic returns and social benefit.