首页|Numerical simulation of the influence factors of NOx emission on a W-type radiant tube
Numerical simulation of the influence factors of NOx emission on a W-type radiant tube
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The radiant tube burner was modeled and analyzed by the numerical simulation method to investigate the influence factors and rules of NOx emissions in a W-type radiant tube.These factors,which include air preheating temperature,excess air coefficient,and fuel gas composition,were modified to study their effects on NOx emissions under varying working conditions.Simulation results were compared with the theoretical calculation value based on chemical reaction equilibrium theory and the onsite experimental value to verify the simulation accuracy.The results show that NOx emissions rise with increasing air preheating temperatures.NOx production increases to an extreme value and then decreases during the oxygen-poor to oxygen-enriched process with the rise of the excess air coefficient.Enhancing the proportion of coke oven gas in the fuel gas raises the combustion temperature as well as the NOx discharge.Both the thermal efficiency and NOx emissions should be balanced.Therefore,the recommended values based on the simulation results are as follows:the air preheating temperature should not exceed 400 ℃,the excess air coefficient should be between 1.1 and 1.2,and the volume fraction of the coke oven gas should not exceed 30％.
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