RH浸渍管侵蚀严重是目前采用RH脱硫普遍存在的一个问题,弄清其侵蚀机理是减缓和避免侵蚀的基本前提.采用FactSage软件从热力学角度分析了RH脱硫剂与浸渍管浇注料的反应机理,同时分析了脱硫剂以及浇注料中添加MgO组分对侵蚀的影响.计算结果表明,RH脱硫剂与浇注料反应生成的主要相为CaO·6Al2O3(CA6)和CaO·2Al2O3(CA2);添加5%(质量分数,下同)的MgO之后可以降低Al2O3在脱硫剂中的饱和溶解度,同时还有一定量的高熔点的MA尖晶石相生成,从而有效缓解侵蚀,提高RH浸渍管的寿命.
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