【摘要】 以层燃–流化复合垃圾焚烧为研究背景,利用实验方法,从垃圾干燥、层燃、流化燃烧3个方面研究了水分对垃圾焚烧过程的影响。垃圾中的过多水分导致垃圾的干燥过程延长,阻碍了垃圾的起燃,吸水性强的垃圾携带较多水分比吸水性弱的垃圾更能阻碍燃烧。在低温层燃状态下,因水煤气反应等作用,CO生成量随着含水率的增加而增加,高温下由于H2O能促进CO的氧化反应,CO随着含水率的增加而降低。高挥发分PVC、PS、木屑等燃料在层燃状态下可产生较高的CO。随着H2O的增加,N向NO、H向CH4的转化率多呈增加的趋势。而在流化燃烧状态下,随着水分的增加,CO降低,NO降低,表明H2O分子在流化床内对燃烧在机理上有强化作用。更多还原

【Abstract】 Experimental study was performed to investigate the impact of moisture content on the combustion process in the MSW (municipal solid waste) incineration, especially in the combined grate and fluidized bed incinerator that is simultaneously characteristic of layer and fluidized combustion process. The higher moisture content prolongs the drying process of fuel so as to weaken the combustion process. The MSW of high hygroscopic capacity is easier to affect the combustion. The impact of moisture content on combustion in low temperature layer combustion and fluidized bed combustion is slightly different. The CO emission concentration increases with the moisture content rise in layer combustion process at low temperature due to water gas reaction. On the contrary, The CO emission concentration decreases with the moisture content rise in layer combustion process at high temperature. The polyvinyl chloride (PVC), polystyrene (PS) and wood chip generate high concentration of CO due to its high volatile content. The conversion rate of N to fuel-type NOx, the conversion rate of H to CH4 is more likely to increase with the rise in moisture content. In the circulating fluidized bed incineration the CO and NOx concentration descend with the increase of moisture content, which reveals the H2O molecule has positive effect on the combustion.更多还原