Numerical Simulation Study on Low-NOx Combustion of Pulverized Coal Swirl Burner with Flue Gas Recirculation
Year: 2025
Type: article
Abstract: Coal is the ballast stone for ensuring national energy security, with coal-fired power generation playing a dominant role in NOx emissions. Therefore, research into low-NOx combustion of coal is of significant importance. This paper focuses on the issue of high NOx emissions at a 600 MW pulverized coal opposed-fired boiler. A study was conducted on the low-NOx combustion of a pulverized coal swirl burner used in this boiler, operating under air-staged combustion. The effects of different primary air duct structures, flue gas interlayer (FGI) widths, and flue gas recirculation ratios on combustion characteristics and NOx emission were investigated using CFD numerical simulation, and the reasons why this structure can reduce NOx were analyzed. The results indicate that, without introducing recycled flue gas, adding a coal powder concentrator structure to the primary air duct can reduce the nitrogen oxide content from 73.98 mg/m3 to 54.24 mg/m3; Under the same flue gas recirculation rate conditions, compared with directly mixing recirculating flue gas and secondary air, installing FGI structure between the primary and secondary air and introducing recirculating flue gas can reduce the concentration of nitrogen oxides from 60.71 mg/m3 to 41.66 mg/m3. It shows that the FGI structure helps to reduce the oxygen concentration in the main combustion zone, promotes the formation of a reducing atmosphere, and effectively inhibits the emission of NOx. The results of this study have important engineering practical value and can provide useful guidance for the optimization design of similar whirlpool burners.
Source: Figshare
Authors: Liu, Jingwen, Zhou, Hao
Language: English
Subfield: Computational Mechanics
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W6977086557
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