掺烧稻壳对煤粉炉飞灰特性的影响

EFFECT OF CO-FIRING ON THE CHARACTERISTIC OF FLY ASH IN 300MWel PC BOILER

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。

The test of co-firing of rice husk and coal was carried on PC boiler of 300MWel unit. The characteristics of the flying ash of co-firing change. The microscopic appearance, the chemical property of the fly ash and the pore structure of the rice husk ash（RHA） were studied. During co-firing, there are the cristobalite and tridymite crystal in the fly ash. RHA presents two kinds： massive anomalous particles and black size laminated ash power; the SiO2 content of the fly ash of co-firing to increasing from 55.93 % to 75.05 %. The pore characteristics of RHA was studied by mercury pomsimeter. The using methods of the fly ash of co-firing will be re-evaluated. However, the rice husk ash separated of co-firing can be use for porous material.