城市污水污泥干化-焚烧系统热力分析  

Thermal analysis of municipal sewage sludge drying-incineration system

作　　者：钱柯贞 陈德珍[1,2] 段妮娜 戴晓虎[4] 杨子旭 QIAN Kezhen;CHEN Dezhen;DUAN Nina;DAI Xiaohu;YANG Zixu(School of Mechanical and Energy Engineering,Tongji University,Shanghai 201804,China;Shanghai Engineering Research Center of Multi-source Solid Wastes Co-processing and Energy Utilization,Shanghai 201804,China;College of Environmental Science and Engineering,Tongji University,Shanghai 200092,China;Shanghai Municipal Engineering Design Institute(Group)Co.,Ltd.,Shanghai 200092,China;School of Chemical Engineering,East China University of Science and Technology,Shanghai 200237,China)

机构地区：[1]同济大学机械与能源工程学院,上海201804 [2]上海多源固废协同处理和能源化工程技术研究中心,上海201804 [3]同济大学环境科学与工程学院,上海200092 [4]上海市政工程设计研究总院(集团)有限公司,上海200092 [5]华东理工大学化工学院,上海200237

出　　处：《热力发电》2022年第5期48-54,共7页Thermal Power Generation

基　　金：国家重点研发计划项目(2020YFC1910100,2020YFC1908701)。

摘　　要：目前,污水处理厂污泥安全高效处理和处置问题在我国尚未彻底解决。干化-焚烧可实现污泥的无害化和减量化,针对典型污泥独立干化-焚烧工艺建立计算模型,探讨了热值、一次风温度等参数对污泥燃烧温度和辅助燃料需要量等的影响。结果显示:随着污泥热值升高,污泥燃烧温度升高,临界含水率上升,热值为10、12、14 MJ/kg的临界含水率约为45%、51%和54%;通过提高一次风温度,可以大幅度提高污泥燃烧温度,但是对于热值为12~14 MJ/kg污泥,在一次风温超过200℃情况下,燃烧温度超过950℃,需采取降温措施;污泥自身提供的热量无法满足污泥干化-焚烧系统整体能耗,干化-焚烧系统的辅助燃料需要量高于仅考虑焚烧系统的需要量;干化-焚烧系统的辅助燃料需要量随着入炉含水率的减少增加。Currently, safe and efficient treatment/disposal of residual sludge is a thorny problem in China. Drying and incineration can realize innocuity and reduction of sludge. This study establishes a calculation model for typical sewage sludge independent drying-incineration and discusses the influences of low heating value(LHV) and primary air temperature on sludge combustion temperature and auxiliary fuel requirement. The results show that,the combustion temperature and critical moisture content of the sludge increases with the sludge heat value, the critical moisture content is about 45%, 51% and 54% respectively for incineration of sludges with 10, 12 and 14MJ/kg LHV. Increasing primary air temperature can significantly increase the combustion temperature of sewage sludge. However, when the sewage sludge is with LHV of 12~14 MJ/kg and the primary air temperature is above 200 ℃, the combustion temperature will be above 950 ℃, so cooling measures should be taken. The auxiliary fuel requirement of the dry-incineration system is higher than that without drying system because the heat provided by the sludge itself cannot meet the total energy consumption of the sludge dry-incineration system. The auxiliary fuel requirement of the dry-incineration system increases with the decrease of the moisture content.

关 键 词：城市污泥 干化 焚烧 模拟 流化床 热力分析 

分 类 号：TK6[动力工程及工程热物理—生物能]