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R.Hallaj; M.Nikazar; B.Dabir
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Abstract: The direct sulfation of limestone from different sources in Iran was studied in a thermogravimetric analyzer under atmospheric pressure. All limestone samples tested have higher than 97% CaCO3, Experimental conditions were as follows: particle size levels ranging from 1.6μm to 7.8 μm, four level reaction temperatures (700℃, 750℃, 800℃ and 850℃), and two SO2 concentrations (2.4×10^-3 and 3.2×10^-3 mol.mol-1). The particle size and temperature showed dominant influences on the rate and level of conversion while the effect of SO2 concentration was weak. The shrinking core model can be used to describe the behavior of the sulfation process. The reaction kinetics and diffusion mechanism are both important in controlling the rate of the process. The two key parameters of the model, chemical rate constant Ks and effective diffusion coefficient Deft were obtained. Model predictions are in good agreement with the experimental data.
Key words: air pollution control, desulfurization, flue gas desulfurization, shrinking core model
摘要: The direct sulfation of limestone from different sources in Iran was studied in a thermogravimetric analyzer under atmospheric pressure. All limestone samples tested have higher than 97% CaCO3, Experimental conditions were as follows: particle size levels ranging from 1.6μm to 7.8 μm, four level reaction temperatures (700℃, 750℃, 800℃ and 850℃), and two SO2 concentrations (2.4×10^-3 and 3.2×10^-3 mol.mol-1). The particle size and temperature showed dominant influences on the rate and level of conversion while the effect of SO2 concentration was weak. The shrinking core model can be used to describe the behavior of the sulfation process. The reaction kinetics and diffusion mechanism are both important in controlling the rate of the process. The two key parameters of the model, chemical rate constant Ks and effective diffusion coefficient Deft were obtained. Model predictions are in good agreement with the experimental data.
关键词: 热解重量分析工艺;硫酸盐化作用;石灰石;二氧化硫;环境保护;大气污染
R.Hallaj,M.Nikazar,B.Dabir. Thermogravimetric Study and Modeling of Direct Sulfation of Limestone by Sulfur Dioxide[J]. .
R.Hallaj,M.Nikazar,B.Dabir. 二氧化硫对石灰石的直接硫酸盐化作用的热重分析的研究与建模[J]. CIESC Journal.
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https://hgxb.cip.com.cn/EN/Y2004/V12/I4/566