In chapter 5 experiments is made on pulverized coal classifier ( pcc ) with air absorbed from the bottom of it and hope to find a simple and high efficiency method to collect coal . the results show the useful method is to control certain absorbing air quantity and positions . simulation is made on pcc to study the flow field and grain track 最后，本文对电厂的一台200mw的四角切园的锅炉应用再燃改造方案后炉内的情况进行了数值计算模拟，研究了四角切圆锅炉内no _ x的生成规律和再燃技术应用后对no的还原效果，并对锅炉进行改造后炉内的流场和温度场进行了计算，为工程应用提供参考。
