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在自行搭建的鼓泡流化床上,以氩气为流化介质,水蒸气为气化介质,对以Fe2O3为氧载体的生物质化学链气化开展研究。探讨氧载体的存在、水蒸气/燃料(S/B)、反应温度等因素对生物质化学链气化过程的影响。结果表明:氧载体的存在能显著改善气化效果,提高气体产率;水蒸气的增加能显著提高合成气中H2的含量,S/B在0.85附近时,能实现生物质气化过程气化效率、产气率、碳转化率等各项指标的最佳平衡;气化过程中的产气率、气化效率、碳转化率均随温度的提高而逐渐升高,但热值随温度的升高而稍有下降;同时,提高反应温度有利于提高合成气中H2、CO的相对浓度,而CO2、CH4浓度随着反应温度的提高而降低,H2/CO比率由700℃时的0.84上升至850℃时的0.92。
On the self-built bubbling fluidized bed, argon was used as the fluidizing medium and water vapor as the gasifying medium, and the chemical gasification of biomass with Fe2O3 as oxygen carrier was studied. The effects of oxygen carrier, water vapor / fuel (S / B), reaction temperature and other factors on the gasification process of biomass were explored. The results show that the presence of oxygen carrier can significantly improve the gasification efficiency and increase the gas yield. The increase of water vapor can significantly increase the content of H2 in the syngas. When the S / B ratio is around 0.85, the gasification can be achieved by gasification Efficiency, gas production rate, carbon conversion rate and other indicators of the best balance; gasification process gas production rate, gasification efficiency, carbon conversion rate increases with increasing temperature, but the calorific value of the temperature While the concentration of CO2 and CH4 decreased with the increase of reaction temperature and H2 / CO ratio increased from 0.84 at 700 ℃ 0.92 at 850 ° C.