A physically based air proportioning methodology for optimized combustion in gas-fired boilers considering both heat release and NOx emissions

Guolin Xiao, Xiaori Gao, Wei Lu, Xiaodong Liu, Aamer Bilal Asghar, Liu Jiang and Wenlin Jing

Applied Energy, 2023, vol. 350, issue C, No S0306261923011649

Abstract: Ensuring the reliable operation of industrial boilers with high production efficiency and low pollutant emissions remains a significant challenge due to the complex chemical and physical reactions that occur within the boiler system. To address this issue, the present research introduces a novel air proportioning methodology for optimized combustion in gas-fired boilers, incorporating real-world data, numerical-computational technologies, and a normalization method. Initially, an average discrepancy of 11.32% is observed between the airflow recorded by the sensors and the actual airflow in the gas-fired boiler. The optimum oxygen levels in the flue gas are determined by striking a trade-off between heat release and pollutant emissions. At loads of 35%, 55%, 75%, and 95%, the recommended oxygen levels under equal-weighted conditions are 3.62%, 3.75%, 3.82%, and 3.91%, respectively. Furthermore, this research also considers the oxygen levels when there are non-equal weightings between heat release and nitrogen oxide (NOx) emissions. At 55% load, the weighting between heat release and pollutant emissions shifts from 1:1 to 1:2, necessitating an increase in the oxygen concentration from 3.75% to 4.30%. The air proportioning methodology proposed in this study offers an efficient framework for optimizing combustion in gas-fired boilers.

Keywords: Air proportioning methodology; Combustion optimization; Gas-fired boilers; Numerical method (search for similar items in EconPapers)
Date: 2023
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DOI: 10.1016/j.apenergy.2023.121800

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