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Model of limestone calcination / sulfation under oxy-fuel fluidized bed combustion

富氧燃烧循环流化床中石灰石煅烧/硫化反应模型（英文）
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摘要 The characteristics of the simultaneous calcination/ sulfation of limestone under oxy-fuel fluidized bed combustion were studied and compared with those of the sulfation of precalcined CaO. During the calcination stage, SO2 can react with product CaO and slow down the CaCO3 decomposition rate by the covering effect of the CaSO4 product. The sulfation rate of simultaneous calcinatiort/sulfation is slower than that of precalcined CaO, but with a long enough sulfation time, the calcium conversion of simultaneous calcination/sulfation is higher than that of the precalcined CaO. A grain-micrograin model is established to describe the simultaneous calcination, sintering and sulfation of limestone. The graln-micrograln model can reflect the true reaction process of the calcination and sulfation of limestone in oxy-fuel fluidized bed combustion. 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.
作者 王春波 刘洪才 陈亮
机构地区 华北电力大学能源动力与机械工程学院
出处 《Journal of Southeast University(English Edition)》 EI CAS 2015年第2期238-243,共6页 东南大学学报（英文版）
基金 The National Natural Science Foundation of China(No.51276064) the Natural Science Foundation of Hebei Province(No.E2013502292)
关键词 OXY-FUEL LIMESTONE simultaneous calcination/sulfation grain-micrograin model 富氧燃烧 石灰石 同时煅烧硫化 晶粒-微晶粒模型
分类号 TK16 [动力工程及工程热物理—热能工程]
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参考文献23

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Journal of Southeast University(English Edition)
2015年 第2期

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