Investigation of NOx Emissions for Superfine Pulverized Coal in Air-Staging Combustion

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• 作者：Jun Shen ; Xiumin Jiang ; Jiaxun Liu ; Xiangyong Huang ; Hai Zhang
• 刊名：Energy & Fuels
• 出版年：2011
• 出版时间：November 17, 2011
• 年：2011
• 卷：25
• 期：11
• 页码：4999-5006
• 全文大小：1075K
• 年卷期：v.25,no.11(November 17, 2011)
• ISSN：1520-5029

文摘

Superfine pulverized coal combustion is a new pulverized coal combustion technology that has better combustion stability, higher combustion efficiency, and comprehensive cost-effective operation. The novelty of this present paper is that fundamental experiments on an electrically heated drop-tube furnace were carried out to understand the NO_x emissions of air-staging combustion for two superfine pulverized bituminous coals used in China for the first time. The results indicate that high-volatile-containing Neimenggu (NMG) coal possesses better effectiveness of NO_x abatement than low-volatile-containing Shenhua (SH) coal. Interesting saddle-point effects of the highest NO_x emissions have been found for both coals around the average particle size of 17.44 渭m for SH coal and 30 渭m for NMG coal. For different stoichiometric ratios and positions of over fire air (OFA) ports, NMG coal provides a higher ability of deNO_x efficiency than SH coal. The superfine pulverized coal combustion of the NMG_25.86 渭m particle can even reach the highest deNO_x efficiency up to 70%. The findings of this paper will provide guidance for further studies on the NO_x emission characteristics of superfine pulverized coal combustion.