To cope with the problem of high NOx emission under the current operating condition of SCV sub-merged burner,this paper describes a low-NOx combustion modification scheme based on flue gas recircula-tion,taking into account the nitrogen reduction of submerged burner and improvement of heat transfer feature of submerged vaporizer.The nitrogen reduction effect of the scheme is evaluated and predicted by numerical simulation,and the combustion and NOx emission characteristics of the submerged burner before and after the flue gas recirculation modification are studied.The result shows that the best flue gas recirculation ratio of the SCV submerged burner can be derived from the numerical simulation method.When a suitable flue gas recirculation ratio(10%-20%)is selected for low-NOx combustion modification,the thermal NOx emission re-duction rate is higher than 65%due to the appropriate reduction of the oxygen and temperature peak in the combustion region of submerged burner.Furthermore,the increased flue gas volume of the combustion system facilitates heat exchange within the water bath.
关键词
SCV/浸没燃烧器/烟气再循环/低氮燃烧/数值模拟
Key words
SCV/Submerged Burner/Flue Gas Recirculation/Low-NOx Combustion/Numerical Simulation
万方数据