【摘 要】
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Coal combustion is divided into two stages.One is the emission and combustion of volatiles and the second is the combustion of coal char.In this paper,effects of CaO on structure evolution and combust
【机 构】
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School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beij
【出 处】
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第十届中国钢铁年会暨第六届宝钢学术年会
论文部分内容阅读
Coal combustion is divided into two stages.One is the emission and combustion of volatiles and the second is the combustion of coal char.In this paper,effects of CaO on structure evolution and combustion reactivity of chars obtained from anthracite and bituminous coals were investigated by a thermo-gravimetric analyzer,SEM and XRD analysis.The chars were obtained from pyrolysis of coals under a N2 atmosphere.Combustion parameters such as ignition,burnout,peak rate,ignition index and combustibility index were studied.The results show that the ignition temperature was decreased and the TG and DTG curves removed to the low temperature region.The ignition index and combustibility index of catalytic chars increased,which means the combustion characteristics of chars were improved by CaO addition.The SEM images of chars indicated that catalytic pyrolysis made the chars featuring a relatively loose structure,high porosity and big specific surface area with plenty of active sites which are favorable for the absorption of O2.The XRD analysis of chars indicated that the order and graphitization degree were decreased by CaO,with d002 increased and Lc and La decreased.
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