市政污泥干化焚烧能量平衡分析及工程设计应用

The Energy Balance Analysis and Engineering Design Application for Municipal Sludge Drying and Incineration

市政污泥干化焚烧作为一种高效的污泥终端处置工艺,近年在我国大中城市应用广泛。以一种典型的污泥干化焚烧工艺流程作为研究对象,搭建该工艺流程各子系统能量平衡模型,并对各系统能量平衡进行计算分析。结果表明:污泥干基低位发热量范围需为14 200~15 500 kJ/kg才能满足干化焚烧系统自持能量平衡,污泥热值不足时需进行辅助能源补充;辅助能源选择中,蒸汽对比天然气具有更好的经济性,在污泥干化焚烧项目选址规划中可考虑环保产业园进行蒸汽协同;综合考虑工艺合理性及经济性,污泥焚烧炉入炉污泥含水率控制在60%~70%为宜。

As an efficient sludge disposal process,municipal sludge drying and incineration has been increasingly used in Chinese large and medium-sized cities in recent years.An energy-balance model for the systems of a typical drying and incineration process of municipal sludge was established,the energy balance of each system was calculated and analyzed.The results showed that the lower calorific value of dry sludge should reach about 14 200~15 500 kJ/kg to meet the selfsustaining energy balance of the system.Supplementary energy supply was needed when the sludge calorific value was insufficient.Steam was more economical than natural gas as a supplementary energy supply.In the site selection planning of sludge drying incineration project,environmental protection industrial park could be considered for steam coordination.Considering the rationality and economy of the process,it was recommended to control the water content of sludge in sludge incinerator at 60%~70%.