合成气生物甲烷化影响因素研究

The Influence Factors of Biomethanation of Synthesized Gas

随着石化资源的日益减少以及环境问题越来越受到人们的重视,可持续再生的清洁能源也逐渐成为人们关注的热点。根据我国特殊的"富煤、少油、贫气"能源结构以及丰富的生物质资源,煤炭和生物质经热解气化技术所得合成气经生物转化作用生产高品质生物燃气的技术在近年来逐渐成为研究者的研究重点。文章主要研究了合成气生物甲烷化技术中温度、气液传质速率等因素对转化效率的影响。研究发现:利用模拟合成气(SSG)为原料气体,气体组成为(H_2:CO:CH_4:CO_2)为7:6:3:4,CO分压为0.1 atm,反应体积为1.2 L,HRT为24 h的条件下,对比37℃,45℃,55℃体系中甲烷含量及液相分析,发现37℃下,体系长期运行更稳定,且甲烷含量相较于高温也较高;而在同一温度下,高转速时系统转化效果更好,说明了气液传质过程对该体系的重要性。

The synthesis gas synthesized by coal and biomass through pyrolysis and gasification technology could produce high quality fuel, i.e. bio-methane, through biotransformation. In this paper, the influence factors during the biomethana- tion of the synthesis gas, i.e. temperature, gas-liquid mass transfer rate, were investigated. The experiments were done with simulated synthesis gas （ H2 ： CO： CH4 ： CO2 = 7： 6：3 ： 4 ） under condition of CO partial pressure 0.1 atm, HRT 24 h. Effect of temperature （ 37 ℃, 45℃ and 55℃ ） in the system were compared and analyzed. The results showed that the 37℃ was better in longer stable operation and higher methane content. At the same temperature, high rotation speed could obtain better biotransformation, showing the importance of gas-liquid mass transfer in the system.