高温煤气可再生脱硫剂与脱硫过程

Sulfur Acceptor and High Temperature Regenerative Sulfur Removal from Hot Coal Gas

煤气的高温脱硫净化是IGCC和DRI生产的瓶颈,直接影响整个过程的热效率。采用氧化铝负载氧化锰的锰系脱硫剂,具有良好的850℃高温脱硫再生性能。锰系脱硫剂的活性中心是Mn-Al-O尖晶石物相,在850℃高温下可以进行较完全的体相S/O交换反应,得到较好的硫容。实验证明,锰系脱硫剂中,Mn/Al良好的相互作用是脱硫剂可再生的关键,不管是浸渍法制备的脱硫剂还是共沉淀法制备的脱硫剂都可以得到较高硫容。采用共沉淀方法可以很容易得到更高Mn负载量,当Mn含量为46.4%时,其硫容可达到30 g(S)/100 g(脱硫剂)。脱硫实验表明,脱硫反应是快反应过程,使用SO2作为再生气体,可以将脱硫剂再生反应与Clause反应耦合生成单质S,从而实现S的资源化回收。通过造粒后的脱硫剂的活性测试和机械性能测试,该脱硫剂在850℃高温下无论是化学性质还是机械强度性质都是稳定的。

By using alumina supported manganese oxide,the manganese-based sulfur acceptor had good performance of sulfidation-regeneration.Mn-Al-O spinel phase was believed to be the active sites of this acceptor.Under 850 ℃,the S/O exchange occurred inside the whole bulk phase of this acceptor,which results in high sulfur capacity.Experimental results showed that the good synergy of Mn/Al is important for the regenerativity of the acceptor.Both the impregnation and co-precipitation can obtain high manganese loading and high sulfur capacity.Co-precipitation method is a easy way to achieve high manganese loading.The sulfur capacity reached 30 g（S）/100g（acceptor） when the manganese loading reached 46.4%.The sulfidation test showed that the sulfidation is a quick reaction.Using SO2 as the regenerative gas,the elemental S is recovered by combining the regenerative reaction and Clause reaction.The granulated acceptor showed very good chemical stability and mechanical stability under 850 ℃.