循环流化床锅炉脱硫飞灰的水活化实验研究

以310 t/h循环流化床锅炉脱硫飞灰为原料,在不同的水活化条件下进行活化机理的实验研究,探讨了水活化温度、活化时间、活化水量对灰中游离氧化钙水合反应转化率的影响规律,并研究了水活化对孔隙结构的影响。结果表明:水活化过程中,水合反应与消耗氢氧化钙的胶凝反应同时进行;水活化过程中氢氧化钙含量呈现快速上升、慢速上升、缓慢下降的规律;随活化温度提高,水合反应与胶凝反应速率均提高,中期持续时间缩短,活化时间一定时,活化温度存在最佳值;活化水量的增加,可以加快水合反应与胶凝反应速率,活化时间处于后期时,活化水量存在最佳值。

Experiment on hydration mechanism of desulphurization fly ash of circulating fluidized bed boiler

The study on hydration mechanism of desulphurization fly ash from a 310t/h circulating fluidized-bed com- bustor was carried out at different water hydration conditions. The influence of hydration temperature, hydration time and amount of hydration water on the conversion of free CaO to Ca（OH） 2 was researched. The pore structure before and after the hydration reaction was compared. The result showed that the hydration reaction of free CaO and gelatification reaction of Ca（OH） 2 occur at the same time. The change of the content of Ca（OH） 2 show the rule of rapid rising, slow rising and slow falling. When hydration temperature is rising, the reaction rate of both hydration and gelatification increase, the lasting time of metaphase becomes shorter. Under a given hydration time, the hydration temperature has a optimum value. The increasing of amount of hydration water makes hydration and gelatification reaction faster, when the time is in anaphase, the amount of hydration water has a optimum value.