EVALUATION OF THE CHANGING GRAIN SIZE MODEL
EVALUATION OF THE CHANGING GRAIN SIZE MODEL
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DOI：
10.1080/00986448408940108
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发表时间：
1984
影响因子：
2.5
通讯作者：
M. L. Davidson;D. Harrison
中科院分区：
文献类型：
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作者：
M. L. Davidson;D. Harrison
摘要采用粒度变化模型对硫化氢与煅烧白云石反应的实验数据进行了分析。该模型对时间转换和径向位置转换数据都有很好的匹配。在较高温度下（T≥700℃），晶粒扩散阻力可以忽略不计，晶粒尺寸变化模型完全具有预测性。在较低温度下，通过将晶粒扩散系数作为“最佳拟合”参数来实现实验匹配。通过将初始比表面积作为一个额外的可调参数（除第一个循环外的所有循环），还成功地模拟了单个颗粒经受多个反应/再生循环的多循环运行。通过假设在每个高温循环中发生额外的烧结，可以证明比表面积随循环次数的减少是合理的。
Abstract Experimental data for the reaction of hydrogen sulfide with calcined dolomite have been analyzed using the changing grain size model. The model provides an excellent match to both time-conversion and radial position-conversion data. At the higher temperatures (T ≥ 700°C), where the grain diffusion resistance is negligible, the changing grain size model is totally predictive. At lower temperatures, the experimental match is achieved by treating the grain diffusion coefficient as a “best-fit” parameter. Multi-cycle runs where a single pellet was subjected to more than one reaction/regeneration cycle were also successfully modeled by treating the initial specific surface area as an additional adjustable parameter (for all cycles except the first). The resulting decrease in specific surface area with cycle number is justified by postulating that additional sintering occurs during each high temperature cycle.