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对富氧燃烧流化床下石灰石同时煅烧/硫化特性进行了研究,并与Ca O硫化特性进行了比较.在石灰石煅烧阶段,Ca O与SO2反应生成Ca SO4产物层覆盖在未煅烧Ca CO3的外层,降低了煅烧速率.同时煅烧/硫化过程中的硫化反应速率比Ca O的硫化反应速率要缓慢,但是经过足够长的反应时间后,同时煅烧/硫化反应的钙转化率比Ca O硫化反应的钙转化率要高.建立了一个包含石灰石同时煅烧、烧结和硫化反应的晶粒-微晶粒模型用于描述流化床内同时进行的石灰石煅烧、烧结和硫化过程,实验证明所建立的模型能够反映流化床富氧气氛中石灰石的真实煅烧/硫化过程.
Simultaneous calcination / sulfidation of limestone under oxygen-enriched combustion fluidized bed was studied and compared with the sulfidation characteristics of CaO. During the calcination of limestone, CaO reacts with SO2 to form Ca SO4 product layer overlying the uncalcined CaCO3 The outer layer reduces the calcination rate.At the same time, the sulfidation reaction rate in the calcination / sulfidation process is slower than the sulfidation reaction rate in CaO, but after a long enough reaction time, the calcination / sulfidation calcium conversion rate is lower than CaO sulfidation The reaction rate of calcium conversion is high.A model of grain-microcrystal containing simultaneous limestone calcination, sintering and sulfidation was established to describe the simultaneous limestone calcination, sintering and sulfidation in a fluidized bed. The experimental results show that the established Model can reflect the true calcination / sulfidation process of limestone in an oxygen-enriched atmosphere in a fluidized bed.