Low Nitrogen Performance Analysis and Optimization of Blast Air Cooled Gas Water Heater based on Synergistic Research of CFD Simulation and Experiment
The fan of the blast air cooled gas water heater needs to supply both the air required for combustion and the air required for combustion chamber cooling,which affects its performance stability.A 16L strong blast cooled gas water heater has a problem of high nitrogen oxides during the experiment.In this paper,simulate the internal flow field and component distribution of the fire,and combustion chamber temperature field by numerical simulation.The causes of high nitrogen oxides are analyzed,that is,the gas migrates downward as it mixes with the air in the ejector tube,resulting in uneven gas distribution in the upper chamber of the fire exhaust and tilted airflow direction at the fire hole,thus af-fecting the uniformity of the flame.A large area of high temperature in the combustion chamber promotes the generation of temperature type NOx.Three schemes of increasing the width of the separator and the wall of the combustion chamber and moving up the injection position are proposed,and the feasibility of the schemes is verified by numerical simulation and experiment,which provides a reference for the design of the combustion system of the strong blast air cooled gas wa-ter heater.
gas water heaterburner elementnumerical simulationNOx
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维普
