并流与逆流竖炉垃圾焚烧工艺计算及对比分析

Technical Calculation and Analysis of MSW Incineration with Co-current and Counter-current Shaft Furnace

对并流竖炉焚烧工艺的物料平衡和热平衡进行了计算,并与传统的逆流竖炉焚烧工艺进行了对比,结果表明:垃圾中灰分变化对临界热值的影响较小,而空气预热温度变化对临界热值的影响较大,当空气预热温度升高时,垃圾气化熔融所需的临界热值明显降低.在相同条件下,并流工艺允许的临界水分值远高于逆流工艺,逆流工艺对垃圾水分限制更为严格;同时并流工艺要求的垃圾临界热值远低于逆流工艺,两种工艺要求的临界热值平均相差4 500kJ/kg左右,说明并流工艺更适合熔融低热值的垃圾.

Mass and heat balance calculation were performed for MSW （municipal solid waste） incineration process with co-current shaft furnace, of which the result was compared with that of the counter-current shaft furnace. Results show that ash content has little influence on the critical heat value required by MSW for gasification and melting, but the air-preheat temperature effects more, i.e. the critical heat value drops greatly with rising air-preheat temperature. Under same working conditions, co-current shaft furnace al- lows a higher moisture limit in MSW, far more than that allowed by counter current process; meanwhile, co-current shaft furnace requires a lower critical heat value of MSW, far below the counter current one, and the average difference value between them is about 45 000 kJ/kg, indicating that the co-current shaft furnace is more suitable for melting MSW of low heat values.