湿污泥循环流化床干化焚烧一体化研究

Research of integrating wet sludge drying with combustion in circulating fluidized bed

为高效处理污泥并回收热量,提出湿污泥干化焚烧一体化工艺。在0.15 MW循环流化床试验台上对湿污泥干化焚烧一体化工艺进行验证性试验。利用循环流化床焚烧产生的热灰在外置式流化床干化器内对湿污泥先进行干化,再送回炉膛燃烧,结果表明通过调节湿污泥给料速率、循环热灰调节阀开度和辅助给煤量可以实现焚烧炉内温度和干化器内料层温度的运行稳定,干化后污泥颗粒粒径分布比较均匀,水分在20%左右,焚烧后烟气排放在环境允许的范围内。

To dispose sludge efficiently and recover heat, a new technology of integrating drying wet sludge with combustion was proposed. The technology was validated by experiments in a 0.15 MW circulating fluidized bed. After hot circulating ash produced by circulating fluidized bed combustion has dried wet sludge in the outward fluidized dryer, all of them ware laid back into the incinerator to combust. Test results show that the steady running of the incinerator and dryer can be realized by adjusting the rate of wet sludge and auxiliary coal, and the valve lift for circulating hot ash. The diameter of dryer sludge pellets was almost uniform, and the moisture of sludge was ca. 20%. The releasing smoke was allowable for environment.