Modified Discrete Random Pore Model Considering Pore Structure Evolution to Depict Coal Chars Combustion in O2/CO2
Modified Discrete Random Pore Model Considering Pore Structure Evolution to Depict Coal Chars Combustion in O2/CO2
复制标题
考虑孔隙结构演化的改进离散随机孔隙模型来描述煤焦在 O2/CO2 中的燃烧
DOI：
10.1021/acs.energyfuels.7b02987
复制
发表时间：
2017-12-01
期刊：
影响因子：
5.3
通讯作者：
Liu, Yang
中科院分区：
文献类型：
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作者：
Fei, Hua;Li, Peisheng;Liu, Yang
煤焦O2/CO2燃烧是一项具有广阔应用前景的技术，对减少温室气体排放具有重要意义，研究煤焦反应过程中孔隙演化的数学模型具有重要意义，而离散随机孔隙模型（DRPM）是煤焦O2/CO2燃烧过程中孔隙演化的数学模型。采用N2等温吸附/脱附法研究了三种煤焦在O2/CO2气氛下反应过程中孔结构的变化。改进了普遍使用的表面积与燃烧速率成比例关系的假设，使其适用于煤焦，表明与反应速率相关的真实表面积应对应于孔表面积2πl（r 0 + θΔr/2）。为此，建立了一个新的孔结构模型（MDRPM），并考虑化学反应的影响，对三种煤在O2/CO2气氛下的燃烧过程进行了模拟。
The O2/CO2 combustion of coal chars currently considered as one of the promising technologies has a remarkable effect on reducing greenhouse gas emissions, and it is of importance to investigate the mathematical model of pore evolution at char reaction process, while discrete random pore model (DRPM) can be usually considered as the mathematic modeling of pore evolution for effective prediction of char combustion at O2/CO2. In this work, pore structure variation of three chars during reaction at O2/CO2 were presented by the N2 isothermal adsorption/desorption method. The universally used assumption of proportional relation of superficial area and combustion rate was improved for application to coal chars, indicating true superficial area associated with the reaction rate should be corresponding to the pore superficial area 2πl(r0 + θΔr/2). Therefore, a new pore structure model (MDRPM) was created to simulate carbon conversion of three coals combustion process in O2/CO2 when chemical reaction is considered...