新型多段式自预热燃烧器设计与数值模拟

摘要

An alternative multi-stage self-preheating burner was designed whose chief advantage was with a high temperature flue gas pipe inside the burner, using the gas to preheat the air and fuel and creating a strong counter current convention heat transfer in the chamber. The flow field, pressure field, and temperature field were analyzed through computational fluid dynamics (CFD), flue gas recirculation rate was calculated and burn-out rate was compared. The results show that the air preheats effect is good and flue gas recirculation rate is larger than 6, meeting the premise condition of high temperature air combustion and the combustion is more stable and completely compared to the traditional burner.%设计一种新型的多段式自预热燃烧器,其技术特点是:内部包含高温烟气回流通道,利用高温烟气预热空气与燃料,并在燃烧室内形成强烈的逆流对流换热.使用计算流体力学(CFD)方法对燃烧器内温度场、燃烧室内速度场和温度场进行模拟,计算烟气卷吸率,并对燃烬率进行比较.研究结果表明:使用该燃烧器空气预热效果较好,烟气卷吸率达到6以上,满足高温空气燃烧所需要的前提条件,比使用传统燃烧器燃烧更稳定、充分.