工业、生活污泥与煤混合燃烧的灰熔特性研究

摘要

The ash fusion characteristics of coal mixed with different kinds of sludge were investigated.Mineral ternary phase diagram and XRD analysis were used to identify interaction mechanism of different mineral components and transformation of ash melting characteristics during burning ofc oal with municipal and industrila sludge.The results show ht at ternary phase diagram can effectively predict the variation of ash melting temperature for co-combustion of coal and sludge.When the content of iron oxide is low, the formation of etu ectic, diopside and anorthite canr educe the ash fusion temperature.Monticellite, mullite and monomer form of iron oxide improve the ash fusion temperature.The sulfur in municipal sludge easily forms low temperature ue tectic of sulfate.Teh influence of phosphorus on the ash fusion temperature is related to the ar tioo f alumina and alkali.When the alumi na is dominant, ph osphorus will reduce the ash uf sion temperature.When the alkali is primary, phosphorus will raise the ash fusion temperature.%针对煤粉锅炉掺烧污泥后污泥对混合燃料灰熔特性的影响行为，利用矿物三元相图、XRD等分析手段，研究了不同特性污泥（生活污泥、工业污泥）与煤掺混燃烧过程中不同矿物组分的相互作用机制及灰渣的灰熔融特性变化特征。结果表明，三元相图能够有效预测煤和污泥掺混后灰熔融温度的变化趋势；低含量的氧化铁形成低温共熔体以及透辉石、钙长石会降低煤和污泥混合后的灰熔融温度；而钙镁橄榄石、莫来石和单体形式存在的氧化铁能提高煤和污泥混合后的灰熔融温度。工业污泥中的高硫组分在混烧过程中易形成硫酸盐的低温共融体。生活污泥中磷对灰熔点的影响与氧化铝及碱金属的比例有关，当氧化铝的含量占主要成分时，磷的存在趋向于降低灰熔点，而当碱金属占主要成分时，磷的存在趋向于提高灰熔点。