白酒糟双床解耦燃烧模拟实验研究

Experimental Study on Dual Bed Decoupling Combustion of Distilled Spirits Lees

采用实验与Aspen Plus模拟相结合的方法,以白酒糟作为富氮高含水生物质残渣的典型代表,研究了生物质残渣双床解耦燃烧的必要性与可行性.结果表明,高水分白酒糟在普通流化床中存在点火时间长、燃烧稳定性差及NO浓度排放高(>800mg/m3)的缺点,而采用双床解耦燃烧可减少点火时间,提高燃烧稳定性并降低NO排放浓度50%以上.模拟结果显示,55%含水率的白酒糟可在双床系统中实现自热燃烧.以石英砂为床料,在500～900℃的流化床燃烧实验中证实了经工业发酵的纤维素更易燃烧,且未发现白酒糟灰的烧结现象.

A dual-bed decoupling combustion technology was proposed to burn the industrial biomass residues rich in water and N generated in various light industry processes.The necessity and feasibility of this technology was investigated through experiments and process simulation by employing the distilled spirits lees to represent the industrial biomass residue.The results showed that in a fluidized bed the higher the water content,the longer the ignition time for the distilled spirits lees.And the combustion is unstable when the water content is higher than a certain value.For high N in feedstuff the NO concentration in the flue gas was found to be higher than 800 mg/m3.Burning the fuel via the decoupling combustion realized stable combustion and reduced the NO emission by more than 50%.The distilled spirit lees were found to be easier to burn out than the rice husk,and no ash melting and agglomeration were found in the quartz sand fluidized bed running in 500～900℃.The process simulation via Aspen plus demonstrated that the stable autothermal combustion could be realized via the duel bed combustion even for the distilled spirits lees containing water of up to 55%（ω）.