70.新規高活性ポーラスCaO系脱硫剤の開発(石炭利用における科学と工学の融合)

抄録

Limestone and lime are used for high-temperature DeSOx sorbents. However, their porosities are usually very low, and also, their SO_2 removal capacity are low. As a solution to this problem, a preparation method for macroporous lime was developed using acetic acid swelling method. This new macroporous material had high activity and capacity for DeSO_x. However, the preparation cost was considerably high. In order to develop low cost macroporous lime, swelling of lime with water vapor and water was studied. It was found the reactivities of those samples were higher than that with raw lime. The improvement of the reactivity of the swelled-lime could be explained on the basis of the change in the pore size distribution of the samples.