摘要
建立了甲烷化反应绝热温升模型，推导了绝热操作线，探讨了循环比对甲烷化工艺的影响。计算结果表明，当反应温度低于600℃时，CO平衡转化率可达95%，随着温度继续升高，平衡转化率迅速下降，当温度为850℃时，其平衡转化率为零。经过5级无循环绝热反应器后，CO转化率达到99.9%，一级反应器出口温度811.35℃，反应温升达531.35℃。循环比0~1范围内，经过五级反应器后，CH4产率大于97.8%，得到的产品气高位热值≥35.35MJ/m3，远高于GB17820-2012要求的二类质量标准，比较接近于一类质量标准。设置循环工艺能够显著降低床层温度。
An adiabatic temperature rise model for methanation was established, from which the adiabatic operation curve was deduced and the effect of recycle ratio on the methanation process was discussed. It is found that CO conversion could be up to 95%at the reaction temperature of below 600℃, however, CO equilibrium conversion decreases rapidly with temperature. At 850℃, CO e-quilibrium conversion is zero. Through the process of five non-cyclic adiabatic reactors, CO conversion reaches 99.9%, and the outlet temperature of first reactor is 811.35℃, 531.35℃higher than inlet temperature. For the process of five reactors with the recycle ratio of below 1, CH4 yield is greater than 97.8%, and the calorific value of product gas is no less than 35.35MJ·m-3, which is much high-er than the second class and close to the first class quality standard of GB17820-2012 requirements. The bed temperature of reactors could be decreased significantly via the circulation process.
出处
《天然气化工—C1化学与化工》
CAS
CSCD
北大核心
2016年第3期76-81,共6页
Natural Gas Chemical Industry
关键词
绝热温升模型
循环比
替代天然气
甲烷化反应
温度控制
adiabatic temperature rise model
recycle ratio
substitute natural gas
methanation
temperature control
