中文摘要：

为改善污泥气化效果，采用化学链气化技术处置污泥．在小型流化床上进行试验，基于赤铁矿载氧体，研究了O／C物质的量比、气化温度和水蒸气体积分数对污泥气化特性的影响以及赤铁矿多次连续循环过程中的物化性能．结果表明：赤铁矿会显著提高污泥的气化程度和碳转化率；当O／C物质的量比增大时，合成气中CO和CH4的体积分数下降，H2的体积分数呈现先下降后上升的趋势；随着气化温度的升高，合成气中CO和H2的体积分数逐渐提高，CO2和CH4的体积分数降低，碳转化率不断提高；当水蒸气体积分数增大时，CO2和H2的体积分数逐渐提高，CO和CH4的体积分数不断下降，碳转化率提高；赤铁矿在长时间运行中表现出良好的反应性．

英文摘要：

To improve the gasification effect of sewage sludge, experiments on chemical looping gasification （CLG） of sewage sludge were conducted in a fluidized bed using hematite as the oxygen carrier, so as to analyze the effects of O/C ratio, gasification temperature, steam content on the sludge gasification charac teristics, and to study the physical and chemical properties of hematite in the process of continuous cyc ling. Results indicate that hematite can markedly enhance the gasification degree and carbon conversion rate of sewage sludge with increasing O/C ratio, the concentrations of CO and CH4 in the syngas decrease, whereas that of H2 firstly decreases and then increases. With the rise of gasification temperature, there is a gradual increase of CO and H2 volumetric fraction, but a gradual decrease of CO2 and CH4 volumetric fraction, with a constant improvement of carbon conversion rate. The increase of steam content would lead to the decrease of CO and CH4 volumetric fraction and to the increase of CO2 and He volumetric fraction in the syngas, as well as to the increase of carbon conversion rate. The hematite shows good reactivities in long-term operation periods.