LI Biao,ZHOU Xin,GAO Bo,et al.Design of Sludge Drying Incineration Treatment Process in Shunyi District[J].China Water & Wastewater,2021,37(14):63-68.
顺义区污泥干化焚烧处理工程工艺设计
- Title:
- Design of Sludge Drying Incineration Treatment Process in Shunyi District
- Keywords:
- municipal sludge; thermal drying; incineration
- 摘要:
- 北京市顺义区污水处理产生的污泥中部分成分含量不达标，不适用于混合填埋、土地改良、园林绿化以及农用，且热值偏低，焚烧处理时需添加辅助燃料。顺义区污泥处理工程（一期）处理规模400 t/d，采用“热干化+焚烧”工艺，设置5台100 t/d的空心桨叶干化机及2台135 t/d的流化床锅炉，烟气净化系统采用“SNCR+半干脱酸塔+活性炭吸附+袋式除尘器+湿法脱酸塔+湿式静电除尘器+防白烟”工艺,以达到《生活垃圾焚烧污染控制标准》（GB 18485—2014）的要求。该项目的试运行结果表明，主要烟气排放数据可以满足要求，同时，也反映出同类项目需在设计阶段重点关注的问题：将容易产生臭气的设备集中布置并充分设置吸风口,以达到有效控制臭气的目的；通过加大输送设备选型参数、缩短输送距离、控制污泥含水率等措施,确保半干污泥输送系统的通畅性；在条件允许的情况下尽量选取锅炉房作为补充蒸汽的热源，进而节约生产成本。经测算，天然气消耗量是影响运行成本的主要因素。
- Abstract:
- Municipal sludge in Shunyi District, Beijing City is not suitable for mixed landfill, land improvement, landscaping and agricultural use, and its calorific value is low, so auxiliary fuel should be added in incineration treatment. The treatment capacity of Shunyi District sludge treatment project (phase Ⅰ) is 400 t/d, and the process is thermal drying and incineration. There are five hollow blade dryers with treatment capacity of 100 t/d and two fluidized bed boilers with treatment capacity of 135 t/d. The flue gas purification system consists of SNCR, semi-dry deacidification tower, activated carbon adsorption, bag filter, wet deacidification tower, wet electrostatic precipitator and anti-white smoke device, and the exhaust is required to meet Standard for Pollution Control on the Municipal Solid Waste Incineration (GB 18485-2014). The trial operational results of the project showed that the main flue gas emission data could meet the discharge requirements. Meanwhile, it also reflected several problems that similar projects should pay attention to in the design stage: equipments which were easy to produce odor were arranged centrally and the suction outlet was fully set to achieve the purpose of effective odor control; the smoothness of semi-dry sludge conveying system was properly maintained by increasing parameters of transportation equipment, shortening the transportation distance and controlling sludge water content; if the conditions permitted, boiler room should be selected as far as possible to supplement the heat source of steam, so as to save operational cost. It was estimated that natural gas consumption was the main factor affecting the operational cost.
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