生物质气流床气化制取合成气的试验研究

SYNGAS PRODUCTION WITH BIOMASS ENTRAINED FLOW GASIFICAITON

利用一套小型生物质层流气流床气化系统,研究了稻壳、红松、水曲柳和樟木松4种生物质在不同反应温度、氧气/生物质比率(O/B)、水蒸汽/生物质比率(S/B)以及停留时间下对合成气成分、碳转化率、H_2/CO 以及 CO/CO_2比率的影响。研究表明4种生物质在常压气流床气化生成合成气最佳 O/B 范围为0.2～0.3(气化温度1300℃),高温气化时合成气中 CH_4含量很低,停留时间为1.6s 时其气化反应基本完毕。加大水蒸汽含量可增加 H_2/CO 比率,在 S/B 为0.8时 H_2/CO 比率都在1以上,但水蒸汽的过多引入会影响煤气产率。气化温度是生物质气流床气化最重要的影响因素之一。

The effects of reaction temperature, oxygen/biomass （O/B） ratio, steam/biomass （S/B） ratio and residence time on gasification performance including gas composition, carbon conversion, H2/CO ratio and CO/CO2 ratio were tested in a lab-scale biomass laminar entrained flow gasification system with rice husk, manchurian pine, korean pine and camphorwood as feed-stocks, respectively. The results revealed that the optimum O/B ratio is in the range 0. 2 - 0.3 at 1300℃ and atmospheric pressure, there is little CH4 in the syngas at high reaction temperature and syngas composition becomes uniform while residence time exceed 1.6s. The H2/CO ratio can increase with steam injected, and exceed 1 when S/B is more than 0. 8. The steam injection affects the gasification efficiency but has little impact on the carbon conversion. The reaction temperature is the most important effect in biomass entrained flow gasification.