煤粉炉掺烧生活垃圾对灰渣特性的影响研究

利用小试规模煤粉炉，研究掺烧不同比例生活垃圾对燃煤灰渣特性的影响，主要包括飞灰元素组成、飞灰粒径分布、飞灰形貌、灰熔点和结渣特性等影响变化研究。结果表明，随着生活垃圾掺烧比例的增加，灰分中Ca、Fe、Cl和S元素含量增加，Al、Mg、K、Na、Ti和Si含量降低，飞灰球形颗粒分布减少，层状堆积结构增多；灰渣熔融特征温度呈平缓下降趋势，但变化范围小于2%，影响较小；掺烧量为25%时，飞灰表面发现少量褐色大颗粒。总之，生活垃圾掺烧对燃煤灰渣特性影响很小，该结果为实际煤粉炉开展掺烧生活垃圾试验提供了一定理论基础。

Study on characterization of ash from co-combustion of coal with municipal solid waste

Experimental study on the slagging and melting characteristics of ashes generated from coal co-combustion with municipal solid waste (MSW) was carried out in a small-scale pulverized coal furnace. The main elements, particle size distribution and morphology of fly ashes were analyzed. Results show that with rising amount of waste, the ratio of Ca, Fe, Cl, and S in the ash increased, but Mg, K, Al, Na, Ti and Si dropped. The morphology of fly ash was observed by scanning electron microscope, finding that the high ratio of waste enhanced the transfer of particles from spherical to layered structures. The fusion temperature descended little within the range of 2%. A small amount of brown particles were found in fly ashes when the ratio of waste reached to 25%. In conclusion, the co-combustion of MSW has little effect on the characteristics of coal ash. These results provide a theoretical basis for the practical co-combustion of MSW in the pulverized coal fired boilers.