MENGXin,CHENWei,CHENBai-xiao.Practice of Xiaoshan 4 000 t/d Centralized Sludge Incineration Project[J].China Water & Wastewater,2022,38(8):127-132.
萧山4 000 t/d污泥集中焚烧处理项目实践
- Title:
- Practice of Xiaoshan 4 000 t/d Centralized Sludge Incineration Project
- Keywords:
- municipal sludge incineration; deep dewatering of sludge; circulating fluidized bed boiler
- 摘要:
- 萧山4 000 t/d污泥集中焚烧处理项目针对污水厂污泥处理难题，通过深度脱水与焚烧发电相结合的方式处理污泥。深度脱水工艺采用化学调理和机械压滤的脱水方式，不同含水率的污泥通过一次压滤脱水就能达到焚烧要求。脱水干化后的污泥含水率降至45%~50%，与质量比为10%的煤混合后，送入循环流化床锅炉进行焚烧。与普通燃煤电厂掺烧污泥相比，本项目泥煤配比有重大突破，污泥焚烧量有很大的提高，入炉焚烧处理污泥达1 800 t/d（含水率45%）。污泥燃烧的余热用于发电，实现了污泥能量转化和净能量输出。烟气处理系统配置石灰石-石膏湿法脱硫、静电除尘、布袋除尘、低氮燃烧等技术措施，烟气排放指标长期稳定优于欧盟2010排放标准。
- Abstract:
- In view of the difficult issues of sludge treatment in a wastewater treatment plant, Xiaoshan 4 000 t/d centralized sludge was treated by the combination of deep dewatering, incineration and power generation. Chemical conditioning and mechanical pressure filtration are adopted in the process of deep dewatering, and the sludge with various moistures can be dewatered to meet the requirement of incineration by the single dewatering process. After dewatering, the sludge moisture was reduced to 45%-50%. After mixing with coal of 10% weight, the sludge was sent to the circulating fluidized bed boiler for incineration. Compared with common coal-fueled power plants, the sludge-to-coal ratio is much higher, thus the sludge incineration capacity has been greatly improved as high as 1 800 t of sludge (moisture 45%) every day. The waste heat of sludge combustion is used for power generation, thus realizing energy conversion and net energy output. The flue gas treatment system is equipped with limestone-gypsum wet desulfurization, electrostatic dust removal, baghouse dust removal, low nitrogen combustion, and other technical measures, thus the gas emission stably outperforms the Directive of EU2010/75/EC in a long run.
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