Numerical study of combustion characteristics for pulverized coal under oxy-MILD operation
Numerical study of combustion characteristics for pulverized coal under oxy-MILD operation
复制标题
全氧MILD运行下煤粉燃烧特性的数值研究
DOI：
10.1016/j.fuproc.2014.10.025
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发表时间：
2015-07
影响因子：
7.5
通讯作者：
Zheng, Chuguang
中科院分区：
文献类型：
--
作者：
Chen, Sheng;Liu, Zhaohui;Zhao, Haibo;Zheng, Chuguang
温和(中等或高度低氧稀释)燃烧是一种减少燃烧过程中NOX排放的新技术。随着这项技术的发展，该技术有望与富氧燃烧相结合，共同控制化石燃料燃烧产生的污染物。本文借助CFD模拟手段，研究了煤在低氧操作条件下的燃烧特性。采用七步全局反应机理模拟了煤燃烧过程，包括气态体积反应和颗粒表面反应。用所采用的模型对参考算例的预测结果与实验结果吻合较好。结果表明，随着初始氧浓度的增加，喷油动量减小，放热增加，燃烧温度升高。在低氧燃烧条件下，随着氧气浓度的增加，炉内CO生成量增加，但最终CO排放量减少。此外，低氧燃烧比空气低氧燃烧表现出更大的降低NOX生成的潜力，并且这种潜力在较高的初始氧浓度下被促进。
MILD (Moderate or Intense Low-oxygen Dilution) combustion is a novel technology to reduce NOXemission from combustion. With the development of this technology, it is expected to combine this technology with oxy-fuel combustion to jointly control the pollutants from fossil fuel combustion. The present paper investigates the combustion characteristics of coal under oxy-MILD operation with the aid of CFD simulations. A seven-step global reaction mechanism is used for modeling coal combustion involving gaseous volumetric reaction and particle surface reaction. The predicted results using the adopted models for the reference case agree well with the experimental results. It is revealed that, the combustion temperature level increases with the enhancement of initial oxygen concentration because of the reduced injection momentum and promoted heat release. The in-furnace CO formation increases but the final CO emission reduces when enhancing the oxygen concentration under oxy-MILD combustion. Moreover, oxy-MILD combustion shows a greater potential on NOXformation reduction than air-MILD combustion, and this potential is promoted at higher initial oxygen concentration.
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影响因子：
4.4
作者：
Medwell, Paul R.;Dally, Bassam B.
通讯作者：
Dally, Bassam B.
DOI：
10.1016/j.proci.2008.06.025
发表时间：
2009
期刊：
--
影响因子：
--
作者：
H. Stadler;Dragisa Ristic;M. Förster;A. Schuster;R. Kneer;G. Scheffknecht
通讯作者：
H. Stadler;Dragisa Ristic;M. Förster;A. Schuster;R. Kneer;G. Scheffknecht
影响因子：
7.4
作者：
R. He;Toshiyuki Suda;M. Takafuji;T. Hirata;J. Sato
通讯作者：
R. He;Toshiyuki Suda;M. Takafuji;T. Hirata;J. Sato
DOI：
10.1201/9781420041033
发表时间：
2002-12
期刊：
--
影响因子：
--
作者：
H. Tsuji;A. Gupta;T. Hasegawa;M. Katsuki;K. Kishimoto;Mitsunobu Morita
通讯作者：
H. Tsuji;A. Gupta;T. Hasegawa;M. Katsuki;K. Kishimoto;Mitsunobu Morita
DOI：
10.1016/j.proci.2006.07.135
发表时间：
2007
期刊：
--
影响因子：
--
作者：
Hai Zhang;G. Yue;Junfu Lu;Zhen Jia;Jiangxiong Mao;T. Fujimori;T. Suko;T. Kiga
通讯作者：
Hai Zhang;G. Yue;Junfu Lu;Zhen Jia;Jiangxiong Mao;T. Fujimori;T. Suko;T. Kiga