煤系高岭土微细粉体振动流化床煅烧的试验研究

摘要

针对由耐火材料构造的高温煅烧窑炉难以实现整体振动的特殊性,开发了具有分布板振动特征的新型振动流态化煅烧工艺,在φ5 mm振动流化床煅烧炉实验装置中实现了煤系高岭土微细粉体(平均粒径25.8 μm)的流态化煅烧,并进行了静态煅烧、常规流态化煅烧和振动流态化煅烧的对比试验.研究表明:流态化烧成速度明显优于静态煅烧;分布板振动可有效减小微细颗粒团聚体尺寸,改善流化质量,缩短烧成时间.在适宜煤系高岭土煅烧的温度(900℃)下,实现振动流态化煅烧的最佳的工艺条件是:流化气速7 cm/s,振动频率25 Hz.%Considering the difficulty of vibrating of whole furnace made by refractory material, a new type of vibrated fluidized bed furnace with the characteristic of only distributor vibrating was developed, and the fluidized calcination of fine powders ( mean particle size is 25.8 μm) kaolinite in coal was realized in this kind vibrated fluidized bed experimental furnace with 35 mm in diameter.The comparative tests of the fine powder kaolinite in coal sample were introduced by using three methods:static calcination, convential fluidization calcination and vibrated fluidization calcination.It is shown that fluidization calcination is obviously superior to static calcination and vibrated fluidization is an efficient process in eliminating the clusters of fine powders, improving the fluidization quality and shortening the firing time.In 900 ℃, an appropriate temperature for calcination of kaolinite in coal, the optimum operation conditions are obtained that gas velocity is 7 cm/s, vibrating frequency is 25 Hz.