A study of combustion characteristics of pulverized coal in O2/H2O atmosphere
A study of combustion characteristics of pulverized coal in O2/H2O atmosphere
复制标题
O2/H2O气氛中煤粉燃烧特性研究
DOI：
10.1016/j.fuel.2013.07.025
复制
发表时间：
2014
期刊：
影响因子：
7.4
通讯作者：
Zheng, C.
中科院分区：
文献类型：
--
作者：
Zou, C.;Zhang, L.;Cao, S.;Zheng, C.
氧汽燃烧技术是以氧气和水蒸气的混合物代替空气作为氧化剂的新一代富氧燃烧技术。利用非等温热失重分析技术研究了SH和PDS煤粉在O2/H2O混合气体中的燃烧特性。在燃烧曲线和动力学分析的基础上，分析了燃烧气氛、氧气浓度、升温速率和粒度对SH和PDS煤粉在O2/H2O混合气中燃烧特性的影响。结果表明，用蒸汽代替氧化剂中的惰性氮气可以延缓SH和PDS煤粉的燃烧过程。在O2/H2O和O2/N2气氛中，随着氧气浓度的增加，着火温度和燃尽温度降低，综合燃烧指数S增大。在O2/H2O气氛中，随着升温速率的增加，SH和PDS煤的燃烧发生在较高的温度区域，但升温速率的增大会增强煤的燃烧性能。随着颗粒尺寸的减小，最大质量损失率增大，着火温度和燃尽温度降低。动力学分析结果表明，用Coats-Redfern积分法对实验数据进行线性拟合后，SH和PDS煤粉在O2/H2O混合气中的燃烧反应符合一级动力学，不同氧浓度下的表观活化能与指前因子之间存在补偿效应。
Oxy-steam combustion technology in which the mixtures of oxygen and steam are used as oxidizer instead of air is a new generation oxy-fuel combustion technology. The combustion characteristics of SH and PDS pulverized coal in O2/H2O mixtures are studied using non-isothermal thermogravimetric analysis technology in this paper. The effect of combustion atmosphere, oxygen concentration, heating rate and particle size on the combustion characteristics of SH and PDS pulverized coal in O2/H2O mixtures are analyzed based on the combustion profiles and kinetic analysis. The results show that replacing the inert N2gas in the oxidizer with steam delayed the burning process of SH and PDS pulverized coal. With the increasing of the oxygen concentration, the ignitionTiand burnout temperatureThdecrease and the comprehensive combustibility indexSincreases both in O2/H2O and O2/N2atmosphere. In O2/H2O atmosphere, the combustion of SH and PDS coal occur in a higher temperature region as the heating rate increases, but the increase in heating rate can enhance the coal combustion property. As the particle size decreases, the maximum mass loss rate increases and the ignition and burnout temperature decrease. The results of kinetic analysis indicate that the combustion reactions of SH and PDS pulverized coal in O2/H2O mixtures follow the first-order kinetics through linear fitting of experimental data using Coats–Redfern integral method, and compensation effect exists between apparent activation energy and pre-exponential factor in different oxygen concentrations during coal combustion in O2/H2O mixtures.
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影响因子：
7.4
作者：
G. Zheng;J. Kozinski
通讯作者：
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影响因子：
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DOI：
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发表时间：
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影响因子：
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通讯作者：
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