摘要
建立了煤基合成气甲烷化反应过程基于吉布斯自由能最小法的热力学计算模型。考察了温度、压力对CO,CO_2单独及同时甲烷化反应的影响,探讨了原料气脱碳处理后,CO_2摩尔分数对CO转化率、CH_4选择性、CH_4产率及积炭的影响。结果表明,低温高压有利于甲烷化反应。在多数情况下CO转化率要高于CO_2,尤其是温度低于600℃时,CO甲烷反应比CO_2更容易发生;随着温度进一步升高,CO_2转化率明显上升,而CO转化率迅速下降。另外,当原料气中CO_2摩尔分数低于2.44%时对积炭无影响,对CH_4的选择性和产率降幅小于10%,在脱碳工艺中可以不予脱除。
A comprehensive thermodynamic analysis of reactions occurring in the methanation was conducted based on the Gibbs free energy minimization method. The effects of reaction temperature,pressure on CO,CO_2 single methanation and simultaneously methanation,and CO conversion,CH_4 selectivity and yield,as well as carbon deposition at different CO_2 content,were carefully investigated. The results show that the low-temperature,highpressure is favorable for reaction. The CO conversion was higher than CO_2 conversion in most cases,especially at temperature below 600 ℃. The CO conversion was relatively higher than CO_2 conversion. The CO_2 conversion rate significantly increased with temperature increasing,while the CO conversion decreased rapidly. It had no effect on the catalyst coke and its impacts on CH_4 selectivity and yield was less than 10%,when CO_2 entering the methanation reactor with content less than 2. 44%,thus the removal procedure should be omitted.
出处
《化学工程》
CAS
CSCD
北大核心
2016年第11期48-53,共6页
Chemical Engineering(China)
关键词
替代天然气
甲烷化反应
二氧化碳
热力学分析
合成气
substitute natural gas
methanation
carbon dioxide
thermodynamic analysis
syngas
