钙基吸收剂脱除SO_(3)的试验研究

Experimental Research on the Removal of SO_(3) by Calcium-based Absorbent

针对碱性吸收剂喷射法,选用CaCO_(3)、Ca(OH)2以及实验室制备的一种多孔CaCO_(3)作为吸收剂,使用控制冷凝法进行烟气SO_(3)捕集,研究吸收剂种类、温度和钙硫比对SO_(3)脱除效率的影响。研究发现:三种吸收剂脱除SO_(3)效果排序为多孔CaCO_(3)>Ca(OH)2>CaCO_(3),多孔CaCO_(3)对SO_(3)脱除效率最高可达80%左右;温度升高有利于提高SO_(3)脱除效率;增大钙硫比可以提高SO_(3)脱除效率,但是当钙硫比增加到15∶1以上时,SO_(3)脱除效率提高不明显,因此在实际应用中需根据现场工况选择合适的钙硫比。从实际应用来看,多孔CaCO_(3)因其经济性具有更好的实用价值。

CaCO_(3),Ca(OH)2,and a porous CaCO_(3) prepared in the laboratory were selected as absorbents,and the controlled condensation method was used for SO_(3) capture in flue gas to study the effect of absorbent type,tempera⁃ture and calcium-sulfur ratio on SO_(3) removal efficiency.The experiment shows that the effect of the three absorbents on SO_(3) removal is sequenced as porous CaCO_(3)>Ca(OH)2>CaCO_(3),and the removal efficiency of SO_(3) by porous CaCO_(3) can reach up to 80%;the increase of temperature is conducive to improving the removal efficiency of SO_(3).The increase of the ratio of calcium to sulfur can improve the removal efficiency of SO_(3),but the improvement of the removal efficiency of SO_(3) is not obvious when the ratio of calcium to sulfur increases to more than 15:1.Therefore,in practical applications,the appropriate calcium-sulfur ratio should be selected according to the field conditions.From a perspective of practical application,porous CaCO_(3) has higher practical value because of its economy.