基于水泥修饰的赤铁矿载氧体污泥化学链燃烧特性研究

摘要

采用水泥修饰赤铁矿来提高载氧体的反应活性。实验在1 kWth串行流化床上进行，研究了添加水泥对污泥化学链燃烧特性的影响，考察其长期运行的物化性能。结果表明，在实验工况下，赤铁矿添加水泥后，出口的未燃气体浓度明显下降。燃料反应器温度低于870℃时，水泥的添加使污泥的碳转化率和燃烧效率显著升高。在10 h长期运行后，一部分污泥灰沉积在载氧体表面。虽然在反应过程中部分的Fe2 O3被深度还原，但在长期运行中未出现流化问题和烧结现象。%Chemical looping combustion ( CLC) for sewage sludge has a relatively low efficiency using hematite as oxygen carrier. The experiments on improving the reactivity of hematite with cement modified for CLC of sewage sludge in a 1 kWth continuous CLC unit were carried out. Compared to hematite oxygen carrier, the concentrations of unconverted combustible gas rapidly decrease when the cement-hematite is used. Moreover, both carbon conversion and combustion efficiency increase when the cement is added. Although some ash particles deposit on the surface of oxygen carrier and a part of Fe2 O3 is reduced to FeO, there are no defluidization and sintering problems.