生物质合成气甲烷化与变换反应串联偶合新工艺

A new process for cascade coupling of biomass syngas methanation with water gas shift reaction

以模拟生物质合成气为原料,在固定床反应器中,对合成气甲烷化反应工艺条件进行优化,并在此反应中串联偶合水煤气变换反应,以此提高生物质合成气中碳氢的比例,从而弥补生物质合成气碳氢比较低的不足,使生物质合成气甲烷化反应更彻底,进而提高甲烷的收率。实验结果表明,在水煤气变换空速为15 000 h^(-1)、进水量0.02 m L·min^(-1)和还原温度为450℃条件下,甲烷化催化剂的性能最优,CO转化率100%,甲烷选择性对于整个偶合反应为50%,但就单一甲烷化反应高达99%。

Using biomass syngas as the raw material, the process conditions of the syngas methanation reaction were optimized in a fixed bed reactor. The cascade coupled water-gas shift reaction with above reaction was carried out to improve the carbon/hydrogen ratio of biomass syngas so as to make up the dis- advantage of its low carbon/hydrogen ratio, which led to a more thorough biomass syngas methanation reaction and a higher yield of methane. The experimental results showed that the methanation catalyst exhibited the optimal performance under the condition of space velocity of the water gas shift reaction 15 000 h^- 1, water amount 0.02 mL · min^-1 and reduction temperature 450 ℃ ;the carbon monoxide con- version was 100%, and the selectivity to methane of the coupling reaction was 50%, which was as high as 99% in a single methanation reaction.