生活垃圾协同焚烧污泥对飞灰物性的影响

Effect of cooperative incineration of sludge on the physical properties of fly ash

以某垃圾焚烧厂750 t/d机械炉排炉为研究对象,通过对不同污泥掺烧比例工况下的布袋除尘器处飞灰进行取样分析,研究污泥协同焚烧生活垃圾对飞灰物性的影响。结果表明:污泥掺烧改变了除尘器处飞灰的粒径分布形式。未掺烧和掺烧工况分别成呈双峰和单峰分布,主峰位置均位于10μm内;掺烧污泥使得峰值粒径飞灰的表面粘附的细颗粒物增加,黏附的细颗粒物球形度较差,可能源自燃料自身矿物质的异相成核或破碎;通过对比飞灰内的钙元素和氯元素含量发现飞灰元素组成受脱酸过程影响较大,明显增加了其钙元素的含量;掺烧污泥增加了飞灰内铁元素和硫元素的含量,但对钠钾元素影响小于铁硫元素。

Using a 750 t/d mechanical grate furnace of a waste incineration plant as research object,the effect of domestic sludge co-incineration on the physical and chemical properties of fly ash was investigated by sampling and analyzing the fly ash at the bag filter under the working conditions of different sludge blending ratios.The results showed that:sludge blending modified the particle size distribution of the fly ash at the bag filter,which was bimodal and unimodal in the unblended and blended conditions,respectively,but the main peaks were both located within 10 microns;sludge blending increased the fine particles adhering to the surface of the fly ash with the peak particle size.A comparison of the elemental composition of calcium and chloride in the fly ash showed that the elemental composition of the fly ash was strongly affected by the deacidification process,which significantly increased its calcium content;co-incineration sludge increased the element iron and sulfur content of the fly ash,but had a relatively little effect on the sodium and potassium elements.