Development of carbonaceous adsorbents from coal reject for acidic gases removal

G.Q. Lu , D.D. Do
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引用次数: 1

Abstract

Studies on the preparation of carbonaceous sorbents from coal reject, a waste material generated in coal preparation processes, by pyrolysis and activation, and their applications to acidic gases removal are reviewed. The kinetics of coal reject pyrolysis and structural changes of coal reject as well as activation of coal reject chars are studied by both experiment and modelling. It is demonstrated that coal reject can be converted to effective adsorbents for NOx and SO2 removal. A two-consecutive-reaction model developed in this work can well describe the pyrolysis kinetics and confirm the softening effect on pore structure development during carbonization of coal reject. Structure-based kinetic models for the activation reactions are developed and validated by experimental data. Experimental and modelling studies of adsorption and reaction of sulfur dioxide on activated coal reject char are summarized. A macropore and surface diffusion model is successfully used to describe and predict the dynamic adsorption and desorption behaviour of SO2 on coal reject-derived adsorbent. It is found that sorption of SO2 in the presence of water vapour and oxygen enhances the capacity owing to sulfuric acid formation.

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煤渣中碳质吸附剂的研制及其对酸性气体的脱除
综述了以选煤过程中产生的废弃物煤渣为原料,采用热解和活化法制备含碳吸附剂的研究进展及其在去除酸性气体中的应用。采用实验和模拟相结合的方法,研究了煤矸石热解动力学、煤矸石结构变化及煤矸石炭的活化过程。结果表明,煤渣可以转化为有效的吸附剂,用于去除NOx和SO2。本文建立的双连续反应模型可以很好地描述热解动力学,并证实了煤矸石炭化过程中软化对孔隙结构发育的影响。建立了基于结构的活化反应动力学模型,并通过实验数据进行了验证。综述了二氧化硫在活化煤焦上吸附和反应的实验研究和模拟研究。用大孔和表面扩散模型成功地描述和预测了SO2在煤渣吸附剂上的动态吸附和解吸行为。发现在水蒸气和氧气存在的情况下,由于硫酸的形成,SO2的吸附能力增强。
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