半干污泥焚烧工程设计分析及探讨

为减少污泥运输体积,减轻污泥运输对环境的影响,污水厂出厂污泥处理趋势逐渐由含水率80%的脱水污泥转变为含水率40%~50%左右的半干污泥。上海市石洞口污泥处理二期工程采用“脱水干化(石洞口本厂污泥)+焚烧及烟气处理(泰和及石洞口污泥)”工艺,是针对半干污泥的焚烧工程。半干污泥接收储运采用“接收坑+抓斗提升”的方式,半干污泥焚烧产生的系统富余热能用于加热污泥调蓄池内的污泥,改善污泥浓缩脱水效果。在此基础上,进一步探讨了选址相对独立的半干污泥焚烧项目需注意的污泥泥质控制、热能利用方式及炉温控制措施等相关因素。

Analysis and Discussion on Semi-dry Municipal Sludge Incineration Project Design

In order to reduce the sludge volume and the impaction on environment during sludge transportation,the municipal sludge from wastewater treatment plant was gradually converted from dewatered sludge with water content of 80%to semi-dry sludge with water content of 40%to 50%.In Shanghai Shidongkou sludge treatment phaseⅡproject,the process of“dehydration and drying(Shidongkou sludge)+incineration and flue gas treatment(Taihe and Shidongkou sludge)”was adopted,which aimed to construct the incineration project of semi-dry sludge.The semi-dry municipal sludge receiving and storage adopted the method of“receiving pit+grab lifting”.To improve the performance of sludge concentration and dewatering,the residual heat generated from the semi-dry sludge incineration was used to heat the sludge in the sludge storage tank.On this basis,we could further explore the related factors such as sludge component content control,heat energy utilization mode and furnace temperature control in the semi-dry sludge incineration project with independent site.