富氧燃烧气氛石灰石溶解特性研究

摘要

在实验室小型试验台上研究富氧燃烧气氛下湿法脱硫用石灰石溶解特性,研究结果表明:较高的CO2浓度对石灰石的溶解有促进作用,CO2体积分数在80％时,石灰石的溶解速率明显增大;在相同的pH值情况下,CO2浓度越高,石灰石的溶解速率越快.在pH--4.5时,低浓度CO2气氛比高浓度CO2气氛下溶解时间增加70 min,CO2浓度对溶解速率的影响比较明显.%Under the oxy-firing combustion surroundings,the characteristics of limestone dissolution used for WFGD were researched on a small-scale test rig.The results indicate that higher CO2 concentration can enhance the dissolution of limestone.Especially at 80％ CO2 concentration the rate of limestone dissolution increases significantly.The higher CO2 concentration,the faster rate of dissolution under the same pH value.When pH is equal to 4.5,it takes 70 more minutes under low CO2 concentration surroundings than with the high CO2 concentration surroundings.Apparently,the CO2 concentration has significant impact on the limestone dissolution.