Evaluation of CO2 Gasification Reactivity of Different Coal Rank Chars by Physicochemical Properties

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• 作者：Xuliang Jing ; Zhiqing Wang ; Qian Zhang ; Zhongliang Yu ; Chunyu Li ; Jiejie Huang ; Yitian Fang
• 刊名：Energy & Fuels
• 出版年：2013
• 出版时间：December 19, 2013
• 年：2013
• 卷：27
• 期：12
• 页码：7287-7293
• 全文大小：379K
• 年卷期：v.27,no.12(December 19, 2013)
• ISSN：1520-5029

文摘

The isothermal and non-isothermal CO₂ gasification of eight different coal rank chars was conducted by a thermogravimetric analyzer (TGA), and the reactivity index and peak temperature were obtained to express the gasification reactivity. In addition, the physicochemical properties of these chars, such as the alkali index, Brunauer鈥揈mmett鈥揟eller surface area (S_BET), micropore area (S_mic), and carbon crystalline structure, were examined by an inductively coupled plasma (ICP) spectrometer, N₂ adsorption, and X-ray diffraction (XRD). The CO₂ chemisorption was also measured by a TGA, and the total, strong, and weak chemisorbed volumes (C_total, C_str, and C_wea) were obtained. All of these properties were used to evaluate the CO₂ gasification reactivity of these chars. The results show that the gasification reactivity of chars decreases with an increasing coal rank. In comparison to the other properties, the C_total and C_str are the best parameters for predicting the gasification reactivity, and the linear correlation coefficients between C_total/C_str and gasification reactivity can reach up to 0.90 or even 0.98. It suggests that the CO₂ chemisorption can be used to evaluate the gasification reactivity of different coal rank chars.