原料气模值对完全甲烷化反应产物的影响  

Effect of module value of feedstock syngas from coal on substitute natural gas product

作　　者：封志伟[1] 周帅林[1] 

机构地区：[1]大唐国际化工技术研究院有限公司,北京100070

出　　处：《天然气化工—C1化学与化工》2016年第5期58-62,共5页Natural Gas Chemical Industry

摘　　要：煤制天然气关键流程包括气化、耐硫变换、低温甲醇洗和完全甲烷化等过程。完全甲烷化过程一般为高低温串并联流程,包括高温大量甲烷化反应和低温补充甲烷化反应。来自低温甲醇洗净煤气的模值（M）对天然气产品的组成至为关键。研究了净煤气M值在2.8～3.0范围内变化对CO和CO_2转化率的影响。结果表明：当M值在此范围内下降时,CO总转化率不受影响,但CO_2总转化率明显降低,影响了天然气产品气的质量。因此,操作上应将模值的波动控制在接近化学计量比附近。The production process of substitute natural gas （SNG） from coal includes gasification, sulfur tolerant shift, Rectisol and methanation units. In the complete methanation unit, the module value （M） of the feedstock syngas is a key parameter. The effect of M value on the composition of SNG product gas was investigated. It was found that the whole CO conversion from bulk methanation to trim methanation steps was not affected, but the whole CO2 conversion declined with decrease of the M value. It is quite necessary to control the M value within a narrow range, such as 2.98-3.02.

关 键 词：煤制天然气 甲烷化反应 模值 CO转化率 CO2转化率 

分 类 号：O643.32[理学—物理化学] TQ426[理学—化学]