污泥与一般固废协同焚烧可行性研究

Feasibility Study on Co-incineration of Sludge and General Solid Waste

城市污水处理厂污泥干化焚烧作为污泥无害化处理的主要技术,越来越多应用于工程化。污泥焚烧在进行理论工艺计算时,可得到污泥燃烧发热量、烟气组成、烟气焓值等关键技术参数。本文采用燃煤锅炉热力计算方法,通过理论计算分析不同含水率对污泥焚烧烟气温度的影响,并通过内插法计算得到污泥可自持燃烧的含水率,同时通过理论计算不同含水率污泥焚烧烟气温度达到标准要求的850℃时,需要添加的辅助燃料(一般工业固废)的量。研究标明,污泥含水率越高,污泥焚烧烟气温度越低,需要补充的辅助燃料越多;一般工业固废的热值较高,可以作为污泥的辅助燃料,可协同污泥焚烧。

As the main technology of sludge harmless treatment,sludge drying and incineration in urban sewage treatment plants are more and more used in engineering.In the theoretical process calculation of sludge incineration,many key technical parameters such as sludge combustion calorific value,flue gas composition and flue gas enthalpy can be obtained.In this paper,the thermal calculation method of coal-fired boiler was used to analyze the influence of different moisture content on the temperature of sludge incineration flue gas through theoretical calculation,and the moisture content of sludge self-sustaining combustion was calculated by interpolation method.At the same time,the amount of auxiliary fuel(general industrial solid waste)needed to be added when the temperature of sludge incineration flue gas with different moisture content reaches 850°C required by the standard was calculated theoretically.The research shows that the higher the moisture content of sludge,the lower the temperature of sludge incineration flue gas,and the more auxiliary fuels need to be supplemented;generally,industrial solid waste has a high calorific value and can be used as an auxiliary fuel for sludge,which can be used in conjunction with sludge incineration.