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在某300MW机组煤粉锅炉上进行稻壳掺烧试验,掺烧后飞灰的性质发生变化。对掺烧后锅炉飞灰的微观形貌、化学性质和稻壳灰的孔隙结构等性质进行试验分析。发现:掺烧稻壳后飞灰的物相中出现鳞石英和方石英晶形,飞灰中稻壳灰呈现熔融后块状的不规则颗粒物和黑色的大粒径的不规则片状灰粒,SiO2的含量从掺烧前的55.93%增加到75.05%。利用压汞仪对稻壳灰的孔隙特性进行分析。稻壳和煤共燃的飞灰的利用方式需要重新评估,而分离的稻壳灰可用作多孔材料。
In a 300MW unit pulverized coal boiler rice hull burning test, the nature of fly ash changes after mixing. The microstructure, chemical properties and pore structure of rice hull ash were analyzed after the mixture was burned. It was found that the pyrite and cristobalite crystals appeared in the fly ash phase after the rice husk was mixed with rice husk, and the ash in the fly ash showed irregular agglomerates of melted massive particles and irregular large flakes of black grain. Content increased from 55.93% before blending to 75.05%. The pore characteristics of rice husk ash were analyzed by mercury porosimetry. The utilization of fly ash co-fired with rice husks and coal needs to be re-evaluated, while isolated rice husk ash can be used as a porous material.