Pollutant Characteristics of Hydrogen-enriched Methane Premixed Flame on Metal Fiber Surface

Under the double-carbon target, there has been a widespread interest in utilizing hydrogen addition to effectively reduce carbon emissions in the natural gas combustion process. In this paper, the effects of combustion thermal power, excess air ratio, and hydrogen blending ratio on NOx and CO emissions were investigated, utilizing a 2 kW fully premixed metal fiber surface burner. The results demonstrated that NOx and CO appeared different variation trends based on different combustion thermal powers. Specifically, NOx exponentially increased with an increase in hydrogen blending ratio, and exponentially decreases with an increase in excess air ratio. In contrast, CO exhibited an opposite exponential trend as the hydrogen blending ratio and excess air ratio changed. By using a fitting method, the mathematical correlation formula of NOx and CO emissions under specific combustion thermal power was obtained. The deviation between the model values and the experimental results is within ±20%, enabling us to estimate pollutant emissions under different working conditions, and determine the operating parameters that meet the pollutant emission requirements. © 2023 Science Press. All rights reserved.