Effect of the Coal Blending Ratio on NOx Formation under Multiple Deep Air-Staged Combustion
Effect of the Coal Blending Ratio on NOx Formation under Multiple Deep Air-Staged Combustion
复制标题
多次深度空气分级燃烧配煤比对NOx生成的影响
DOI：
10.1021/acs.energyfuels.9b02965
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发表时间：
2020-01
期刊：
影响因子：
5.3
通讯作者：
Yuegui Zhou
中科院分区：
文献类型：
--
作者：
Yongqiang Wang;Yuegui Zhou
在一维煤粉燃烧实验炉上进行了贫煤、烟煤及其混煤的空气分级燃烧实验。研究了一次燃烧区过量空气系数、多级空气分级燃烧、烟煤掺煤比等因素对煤粉燃尽率和NO_x排放的影响。在固定床中进行了混合煤在Ar和NO/Ar气氛下的热解实验，研究了热解产物与NO的还原机理。结果表明，在单级空气分级燃烧条件下，当CBR增加到50%时，混合煤的燃尽率低于线性计算结果，然后随着CBR的进一步增加，燃尽率呈现相反的趋势。这反映了烟煤燃烧对贫煤燃烧性能的改善和抑制作用之间的竞争。与单级空气分级燃烧相比，多级空气分级燃烧的临界点CBR值降低到25%。在不同分级燃烧条件下，当CBR增加到50%时，混煤的NO_x排放指数降低，然后随CBR的增加变化不大。三重空气分级燃烧与50%的CBR的组合是实现较低的NOx排放的最佳方案。此外，固定床实验表明，混煤热解释放的CO能有效还原NO，这可以解释混煤燃烧条件下NO的还原机理。
The air-staged combustion experiments of lean coal, bituminous coal, and their blends were performed in a one-dimensional coal combustion experimental furnace. The influences of excess air coefficient in the primary combustion zone, multiple air-staged combustion, and coal blending ratio (CBR) of bituminous coal in coal blends on the burnout ratio and NOₓ emissions were evaluated. The coal blend pyrolysis under both Ar and NO/Ar environments was performed in a fixed bed to investigate the reduction mechanism between pyrolysis products and NO. The results show that, under single air-staged combustion, the burnout ratio of coal blends is lower than that of linear calculation result when the CBR increases up to 50% and then shows the opposite trend with further increasing CBR. This reflects the competition between the improvement and inhibition effects of bituminous coal combustion on the combustibility of lean coal. The CBR value of the critical point reduces to 25% under multiple air-staged combustion in comparison to single air-staged combustion. The emission index of NOₓ of coal blends decreases when the CBR increases up to 50% and then changes a little with further increasing CBR under different air-staged combustion conditions. The combination of triple air-staged combustion with the CBR of 50% is optimal to achieve the lower NOₓ emissions. Moreover, the experiments in the fixed bed indicate that CO released from coal blend pyrolysis can effectively reduce NO, which can be used to explain the NOₓ reduction mechanism under coal blending combustion.
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影响因子：
11.2
作者：
N. Hodžić;A. Kazagić;I. Smajević
通讯作者：
N. Hodžić;A. Kazagić;I. Smajević
影响因子：
7.5
作者：
Jiancheng Yang;R. Sun;Shaozeng Sun;Ningbo Zhao;Ningfeng Hao;Hong Chen;Yong Wang;Haorong Guo
通讯作者：
Jiancheng Yang;R. Sun;Shaozeng Sun;Ningbo Zhao;Ningfeng Hao;Hong Chen;Yong Wang;Haorong Guo
DOI：
10.1016/j.egypro.2017.03.846
发表时间：
2017-05
期刊：
Energy Procedia
影响因子：
--
作者：
Liu Debo;Qiang Lv;Feng Yongxin;Chang’an Wang;Xuan Liu;Kai Chen;Xu Kai;Zhong Jun;D. Che
通讯作者：
Liu Debo;Qiang Lv;Feng Yongxin;Chang’an Wang;Xuan Liu;Kai Chen;Xu Kai;Zhong Jun;D. Che
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影响因子：
5.7
作者：
Li, Song;Chen, Zhichao;Zhang, Xiqian
通讯作者：
Zhang, Xiqian
影响因子：
5.3
作者：
B. Lee;Seoung-gon Kim;Juhun Song;Young-June Chang;C. Jeon
通讯作者：
B. Lee;Seoung-gon Kim;Juhun Song;Young-June Chang;C. Jeon