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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。
RH immersion pipe serious corrosion RH desulfurization is currently prevailing a problem, to clarify its erosion mechanism is to reduce and avoid erosion of the basic premise. Using FactSage software, the reaction mechanism between RH desulfurizer and immersed tube castable was analyzed from the thermodynamic point of view. At the same time, the effects of desulfurizing agent and MgO addition on castables on erosion were analyzed. The results show that the main phases of RH desulfurizer and castable are CaO.6Al2O3 (CA6) and CaO.2Al2O3 (CA2). Adding 5% (mass fraction) Of saturated solubility, while there is a certain amount of high-melting point MA spinel phase formation, thereby effectively mitigate the erosion and improve RH immersion tube life.