余热蒸汽循环载热的煤气甲烷化工艺  

Syngas methanation with reaction heat carried by steam recycling generated from waste heat

作　　者：沈倩[1] 陈建利[1] 夏素兰[1] 朱家骅[1] 

机构地区：[1]四川大学化工学院多相流传质与反应工程四川省重点实验室,四川I成都610065

出　　处：《化工学报》2009年第9期2271-2275,共5页CIESC Journal

基　　金：国家自然科学基金项目(29876022)~~

摘　　要：对余热推动蒸汽循环载热煤气甲烷化节能工艺理论分析和计算表明,工艺气体载热能力正比于汽/气比H,通过蒸发/冷凝耦合的两相流传热传质可使H达3.0～4.0,使甲烷化反应绝热温升控制在300～400℃范围。该工艺节省了循环压缩机及其功耗,甲烷化工艺的能量效率提高6%以上。现场单管试验初步证明,高汽/气比不影响甲烷化催化剂反应活性。A theoretical analysis was made for the energy saving process of syngas methanation with reaction heat carried by steam recycling generated from waste heat.Calculations of the main parameters demonstrated that the heat carrying capacity was proportional to the parameter H,the molar ratio of steam to other components in the syngas mixture.From heat and mass transfer taking place in the coupled evaporation and condensation two-phase flow,H could reach the value of 3.0—4.0.Consequently the adiabatic temperaturrun-up in the catalytic methanation reactor could be controlled within 300-400℃.The energy efficiency of the process could be improved by over 6% because of omitting the mechanical compressor for recycling of process fluid. The experimental results obtained in a tubular reactor indicated that the performance of methanation catalyst remained the same owing to the high value of steam content.

关 键 词：煤气甲烷化 节能工艺 蒸汽循环 蒸发/冷凝耦合 

分 类 号：TQ54[化学工程—煤化学工程]