Thermogravimetric Kinetics of MgSO3·6H2O Byproduct from Magnesia Wet Flue Gas Desulfurization

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• 作者：Hui Chen ; Honghua Ge ; Binlin Dou ; Weiguo Pan ; Guoding Zhou
• 刊名：Energy & Fuels
• 出版年：2009
• 出版时间：May 21, 2009
• 年：2009
• 卷：23
• 期：5
• 页码：2552-2556
• 全文大小：142K
• 年卷期：v.23,no.5(May 21, 2009)
• ISSN：1520-5029

文摘

Wet flue gas desulfurization using a magnesia slurry sorbent in coal-fired power plants has been used because of its high SO₂ removal efficiency and reliable and low utility consumption. The regeneration of MgSO₃·6H₂O byproduct to form magnesia is one of the key technologies to achieving environmental friendliness and low cost for this process. In this paper, the thermal decomposition behavior of MgSO₃·6H₂O byproduct was investigated by the thermogravimetric analysis (TGA) method. The overall decomposition process can be divided into four phases. The observed mass loss in the first phase of dehydration is about 19−22 wt %, and the mass value of the final residual is 41−45 wt %. X-ray diffraction analysis for four phases was also conducted to assist the understanding of sample composition and its decomposition process. The thermogravimetric kinetic parameters were calculated using the Ozawa−Flynn−Wall method and the Coats−Redfern integral equation. The decomposition mechanism of MgSO₃·6H₂O byproduct can be concluded as the assumed random nucleation and its subsequent growth, with the best estimated value of 319.8 kJ/mol for the activation energy of thermal decomposition.