Effect of the coupling action between volatiles, char and steam on isothermal combustion of coal char
Effect of the coupling action between volatiles, char and steam on isothermal combustion of coal char
复制标题
挥发分、焦炭和水蒸气耦合作用对煤焦等温燃烧的影响
DOI：
10.1016/j.applthermaleng.2015.09.103
复制
发表时间：
2016-01
影响因子：
6.4
通讯作者：
Lufei Jia
中科院分区：
文献类型：
--
作者：
Huan Shao;Ming Lei;Yingai Wu;Lufei Jia
在自制的等温热重实验系统上研究了挥发分、半焦和水蒸气之间的耦合作用对煤焦燃烧特性的影响。结果表明，挥发分在燃烧过程中起着关键作用。挥发分燃烧产生的热量加快了煤粉的燃烧速度，同时挥发分燃烧消耗了焦炭颗粒周围的氧气。随着炉膛温度的降低，挥发分燃烧对燃速的加速作用增强，对氧耗的影响减小。挥发分对燃烧速率加速和氧消耗的影响似乎与煤阶成反比。当反应器内氧气浓度从21%降低到5%时，挥发分和煤焦的燃烧过程呈现出分离的趋势。水蒸气的存在显著提高了煤焦的燃烧速率，缩短了煤焦的燃烧时间，对煤焦的燃烧有显著影响。
The effects of the coupling action between volatiles, char and the steam on combustion characteristics of coal char were studied in a customized isothermal thermogravimetric experimental system. The results showed that volatiles released during devolatilization played a key role in the combustion. Heat produced by volatiles combustion accelerated the burning rate of pulverized coal, at the same time, volatiles combustion depleted the oxygen surrounding the char particles. With the decrease of the furnace temperature, the acceleration effect on burning rate due to volatiles combustion improved while its impact to oxygen consuming reduced. The influence of volatiles on burning rate acceleration and oxygen depletion appeared to be inversely affected by the coal rank. When oxygen concentration decreased from 21% to 5% in the reactor, the burning process of volatiles and coal char displayed a tendency of separation. In addition, the presence of steam, which increased the burning rate and reduced the burning time noticeably, had a significant impact on the combustion of coal char.
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DOI：
--
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