Numerical Study of the Combustion Characteristics of CH 4 /H 2 Swirl Burner by Geometric Parameters of Swirling Disc

Natural gas is a clean, environmentally friendly, new, and efficient energy source. Due to its lower pollutant emissions, it is gradually being adopted to replace traditional fossil energy in the architectural ceramics industry. For industrial production, the air disc at the outlet of the swirl burner is crucial for ensuring the burner’s adequate combustion. In the present study, the structure of the existing swirl burner used in the architectural ceramics industry was improved and optimized, and a three‐dimensional CFD numerical simulation was conducted. The results show that as the blade angle increases, combustion stability is enhanced, with a slight increase in flame length. Meanwhile, when the blade angle is 25°, the emissions of CO and NO gradually decrease, and combustion efficiency is improved. As the swirler thickness increases, the high‐temperature zones expand, and CO and NO emissions are reduced. Specifically, when the swirler thickness is 14 mm, CO and NO emissions are significantly decreased; compared with those at 8 mm, NO emissions are reduced by 72.73%. This work provides a reference for the application of hydrogen‐blended natural gas in swirl burners.