Experimental and simulation study of key parameters of low NOx water-cooled burners

Abstract

With the increasingly stringent requirements for nitrogen oxide emissions, fully premixed water-cooled burners have been gradually discussed and studied due to their low cost and obvious effect on NOx reduction. However, their application in civil gas appliances is relatively rare, and there are few systematic studies combining experiments and simulations. In this paper, the experimental research and numerical simulation of the water-cooled burner are firstly carried out, and the accuracy of the numerical model is verified by the measured results. Then, the location and influencing factors of NOx generation are analyzed, and the direct factors affecting NOx generation in the water-cooled combustion technology are determined. The results show that the primary air coefficient is the main factor affecting the formation of NOx, the secondary air has little effect on the formation of NOx, and the premixed air temperature has little effect on it. The results have certain guiding significance for the design of water-cooled burners.

Keywords

• Water-cooled burner
• Premixed combustion technology
• Instantaneous water heater
• Nitrogen oxide emission
• Experimental research
• Numerical simulation