湿法烟气脱硫系统中石灰石活性的评价

为确定湿法烟气脱硫系统中广泛应用的脱硫剂石灰石的活性,选取表观溶解速率常数k作为活性评价指标,在一定的反应温度、搅拌速率和粒径分布条件下,在釜式反应器中采用定pH值滴定法对4种应用于湿法烟气脱硫系统的石灰石活性进行了评价。结果表明,表观溶解速率常数k与石灰石的种类有关,与石灰石中的碳酸钙含量关系不大,可能与石灰石中所含的方解石晶体的结晶程度有关。方解石的晶粒越细,石灰石结构越疏松,活性越好。

Evaluation of Limestone Reactivity in Wet Flue Gas Desulfurization

The apparent dissolution rate constant was taken as a reactivity index for evaluating the reactivity of limestone widely used as absorbent in wet flue gas desulfurization(WFGD) systems.Under certain conditions of reaction temperature,stirring speed and particle size distribution,the WFGD reactivity of four kinds of limestonewas respectively evaluated by the pH-stat method in a pot type reactor.Results indicate that,the apparent dissolution rate constant k is related to the variety but out of relation to the calcium carbonate content of limestone,which may be determined by the crystallization degree of calcite in limestone.The finer the calcite grains and the looser the limestone structures are,the stronger the limestone reactivity will be.