接触式风水共冷对流化床灰渣的活化作用研究  

Activation effect on fluidized bed combustion ash ofcontact cooling with air and water

作　　者：施正展[1] 王观华[1] 骆仲泱 岑可法[1] 

机构地区：[1]浙江大学热能工程研究所能源清洁利用与环境工程教育部重点实验室,浙江杭州310027

出　　处：《浙江大学学报（工学版）》2004年第7期864-867,共4页Journal of Zhejiang University：Engineering Science

基　　金：国家"973"重点基础研究发展规划资助项目(G199902210505).

摘　　要：提出了接触式风水共冷的灰渣冷却方式,研究了这种冷却方式对流化床灰渣的活化作用机理.在冷渣器中通入冷却风使高温灰渣处于流化状态,通过雾化喷嘴将冷却水喷入床内与灰渣直接接触.采用分峰法对冷却后灰渣样品的X衍射图谱进行非晶态含量分析,用国家标准方法测定了灰渣的活性指标——抗压强度比.试验结果表明,这种冷却方式与堆积自然冷却、风冷、喷雾冷却等相比,冷却速率提高5倍以上;对灰渣颗粒表面具有较强的腐蚀作用,有效增加了灰渣中的非晶态矿物含量,使灰渣得以活化;灰渣的抗压强度比提高了5%～10%.This study put forward an ash cooling method - contact cooling with air and water together, whose activation mechanism was also studied. The cooling air was blown into the ash cooler to make the high-temperature ash fluidized, and the cooling water was sprayed by the atomizing nozzle to contact with the ash directly. For the cooled ash, X-ray diffraction (XRD) analysis was carried out with peak division method, and the activation index - the compressive strength ratio was measured with the national standard method. The experimental results show that with the cooling method the cooling rate of ash can be improved more than 5 times comparing with the natural cooling, air cooling or spray cooling. In addition, the ash particle surface can get more corrosion and the amorphous mineral content of ash can be increased. Accordingly, the ash can be activated and the compressive strength ratio can be improved about 5%-10%. Hence, the amount of ash used as cement addition can be increased.

关 键 词：灰渣 接触式风水共冷 冷却速率 活化 

分 类 号：TP227.3[自动化与计算机技术—检测技术与自动化装置]