Energy & Fuels
Energy & Fuels
5 years ago

Impact of the Multihole Wall Air Coupling with Air Staged on NOx Emission during Pulverized Coal Combustion

Impact of the Multihole Wall Air Coupling with Air Staged on NOx Emission during Pulverized Coal Combustion
Lu Zhou, Zhijian Wang, Honghe Ma, Jia Wei Chew, Pengpeng Guo, Jun Li, Huijuan Du, Suxia Ma, Wei Zhang
Air staged combustion is one of the most sophisticated and effective technologies for reducing NOx emission during pulverized coal combustion. However, it may also result in the problems of high temperature corrosion, slagging, and high imperfect/incomplete combustion loss. In order to prevent these problems, the multi-hole wall air coupling with air staged technology (MH&AS) has been developed. The aim of this work is to investigate the impact of MH&AS on NOx emission by applying a laboratory scale of MH&AS furnace. The results show that there existed an optimal multi-hole wall air ratio to significantly reduce the NOx emission. For example, with the burner air ratios of 0.6, 0.7, 0.8, and 0.9, the corresponding optimal multi-hole wall air ratios were 0.100, 0.075, 0.050 and 0.025, respectively. The air distribution mode with a smaller burner air ratio and its optimal multi-hole wall air ratio was more conducive for NOx reduction. Furthermore, the influence of coal properties on NOx emission was also evaluated. The higher the fuel ratio, the larger the optimal multi-hole wall air ratio. Whereas, the finer the pulverized coal, the smaller the optimized multi-hole wall air ratio. There was a critical moisture content for the specified coal to obtain the minimum of NOx emission. Besides, the effect of MH&AS on the burnout was also explored. The optimal multi-hole wall air ratio could simultaneously making for the minimum of NOx emission and the ultimate value of burnout. Finally, the mechanism of NOx reduction by char during MH&AS combustion was proposed.

Publisher URL: http://dx.doi.org/10.1021/acs.energyfuels.7b03539

DOI: 10.1021/acs.energyfuels.7b03539

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