利用窑尾废热干燥入窑料以节能提效

钛白粉的煅烧回转窑多为湿法进料,游离水干燥段占回转窑总长度的1/3,导致生产效率及热能利用率偏低。新工艺将饼状物料送入闪蒸干燥机,经来自回转窑尾部的热废气干燥,粉碎后送入回转窑煅烧,可使尾气排放的温度从300～350℃降至100℃左右,从而提高热利用率,减少尾气降温的成本,回转窑的生产能力也可提高30%。

Application of waste heat of rotary kiln in drying titanium dioxide for energy saving and efficiency increasing

Titanium dioxide was mostly fed into the calcination rotary kiln in wet way.As the drying section of free water accounted for 1/3 of the total length of the rotary kiln,the production efficiency and the heat utilization rate were very low.In the new technology,cake-like material was put into the flash dryer at first,and then desiccated by the waste hot gas from the tail of rotary kiln.After crashed,the material was sent to rotary kiln for calcination.The new technology could make the temperature of the emission reach 100 ℃ or so from 300～350 ℃.Thus the heat utilization was improved,the cost of tail gas cooling was reduced and the production capacity of rotary kiln could be also increased by 30%.