Anhui Province Key Laboratory of Metallurgical Engineering & Resources Recycling (Anhui University of Technology), School of Energy and Environment, Anhui University of Technology, Ma'anshan 243002, Anhui Province, China.
Anhui Province Key Laboratory of Metallurgical Engineering & Resources Recycling (Anhui University of Technology), School of Energy and Environment, Anhui University of Technology, Ma'anshan 243002, Anhui Province, China.
Waste Manag. 2021 Mar 15;123:120-130. doi: 10.1016/j.wasman.2021.01.028. Epub 2021 Feb 11.
The combustion and pollutant emission characteristics of the dried sludge in a fluidized bed combustor (FBC) were studied. The sludge reburning technology was employed for the first time in FBC. A scheme for using the dried sludge reburning blended with calcium magnesium acetate (CMA) to reduce pollutants simultaneously was also proposed, and the effect of the CMA addition was investigated. Results showed that fluidized bed reburning technology can be used to effectively treat the sewage sludge with lower calorific values. As the secondary fuel mass percentage increases, the unburned carbon content in fly ash and the CO emission increase, resulting in lower combustion efficiency. However, the de-NO ratio increases from 37.1% to 53.7%, and the de-SO ratio only increased from 1.6% to 7.6% as the secondary fuel mass percentage increase from 10% of 25%. For dried sludge blended with CMA, the minimum emissions of SO and NO significantly decrease to 254 mg/Nm and 70.9 mg/Nm at Ca/S ratio of 2, respectively. Results of main gaseous pollutant emissions from the sludge combustion in an FBC using different pollutant removal methods were compared under well-defined conditions. Fuel reburning blended with CMA addition has the smallest SO and NO emissions.
研究了流化床燃烧（FBC）中干污泥的燃烧和污染物排放特性。首次在 FBC 中采用了污泥再燃技术，并提出了一种使用干污泥再燃与醋酸钙镁（CMA）混合以同时减少污染物的方案，并研究了 CMA 添加的效果。结果表明，流化床再燃技术可用于有效处理低热值的污水污泥。随着二次燃料质量百分比的增加，飞灰中的未燃碳含量和 CO 排放量增加，导致燃烧效率降低。然而，随着二次燃料质量百分比从 10%增加到 25%，NO 的脱除率从 37.1%增加到 53.7%，SO 的脱除率仅从 1.6%增加到 7.6%。对于与 CMA 混合的干污泥，在 Ca/S 比为 2 时，SO 和 NO 的最低排放量分别显著降低至 254 mg/Nm 和 70.9 mg/Nm。在明确的条件下，比较了使用不同污染物去除方法的 FBC 中污泥燃烧的主要气态污染物排放的结果。燃料再燃与 CMA 添加相结合时，SO 和 NO 的排放量最小。
