气体组分对绝热甲烷化反应温度和总转化率的影响研究

The Effect of Gas Concentration about Temperature and in the Adiabatic Methanation Reaction Study

近年来,受天然气需求增加和环保压力影响,煤制天然气和焦炉煤气制天然气成为能源领域研究热点,而甲烷化技术是煤制天然气和焦炉煤气制天然气相关技术的核心之一。文章采用Aspen Plus模拟软件,模拟选取7组典型甲烷化反应原料气,研究了原料气组分变化对甲烷化反应温度和总碳转化率的影响。研究结果表明:绝热甲烷化反应器出口温度随着H2、CO的浓度增加而增加,随着CH4、CO2、N2和H2O浓度增加而降低,其中CH4和H2O的变化影响较为显著,所以在工艺流程设计和现场装置操作时,选取CH4和H2O作为甲烷化反应的主要控制手段。∑CO+CO2的总碳转化率随着原料气中CO、CO2浓度的增加而降低,随H2浓度增加而快速增加,而与N2、CH4和H2O的浓度影响较小。文章研究结果既可作为甲烷工艺设计的技术基础,也可对甲烷化现场装置的安全操作提供技术指导,促进煤制气产业的健康、快速发展。

In recent years, Nature gas made by coal gas and coke oven gas become an important research field by the influenced of naturat gas demand enhance and environmental pollution. The methanation technology is one key technology in the Coal chemical industry. In the paper, 7 groups of typical methane gas composition is studied using the Aspen Plus simulation software to study gas content effect about the temperature and the total carbon conversion rate. The results show that adiabatic methanation reactor temperature improve by H2, CO concentration increases, and reduce by the CH4, CO2, N2 and H2O concentration increases. The total carbon conversion in the feed gas reduces with the increase of the concentration of CO, CO2, and improve by the concentration of H2, N2, CH4 and H,O. The results of the paper can be used as methane process design technology base, also can improve the methanation device safe operation, promote the development of coal seam gas industry.