Experimental Investigation on NOx Reduction Potential of Gas-Fired Coal Preheating Technology

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• 作者：Changchun Liu ; Shien Hui ; Su Pan ; Hao Zou ; Geng Zhang ; Denghui Wang
• 刊名：Energy & Fuels
• 出版年：2014
• 出版时间：September 18, 2014
• 年：2014
• 卷：28
• 期：9
• 页码：6089-6097
• 全文大小：476K
• ISSN：1520-5029

文摘

A gas-fired coal preheating (GFCP) technology, offering a flexible method to reduce NO_x, could be used with other de-NO_x combustion technology such as air staging to seek maximum NO_x reduction. The preheating chamber key apparatus of GFCP was investigated with the help of infrared camera. The results show that devolatilization and partial oxidation (combustion) of coal occurred in the preheating chamber, and this may prove the main heat source of preheating chamber is combustion of coal volatiles and gas is only used to prevent flameout. A self-sustaining combustion drop furnace was used to investigate the NO_x reduction potential of GFCP with air staging. Gas species concentrations along furnace are plotted for several runs, offering details to further study and analyze the GFCP. With GFCP, much HCN, C_iH_j, and soot were produced in the preheating chamber, so under the similar air staging condition, the NO destructed by HCN and soot was stronger than that without. NO_x reduction could archive up to 72% with GFCP and air staging, if the residence time in the combustion zone could be prolonged, the NO_x reduction will be even higher.