针对含有少量水蒸气的增压富氧煤燃烧产生的烟气在竖直管内的对流凝结换热进行了分析研究.利用修正的膜模型与Nusselt凝结理论建立了换热数学模型,并对不同壁面温度、不同雷诺数和不同水蒸气份额下烟气的凝结换热进行了计算.结果表明:壁面温度升高时,烟气的凝结速率、换热流率和凝结液膜的厚度均减小;混合气体的雷诺数增大时,烟气的凝结速率和换热流率增大,凝结液膜的厚度减小;烟气中水蒸气的份额减小时,烟气的凝结速率和换热流率减小,凝结液膜的厚度减小不明显. Aiming at the convection and condensation heat transfer of flue gas generated by the combustion of supercharged oxygen-enriched coal with a small amount of water vapor in a vertical tube, a mathematical model of heat transfer was established by using modified membrane model and Nusselt condensation theory. Temperature, different Reynolds number and different steam vapor fraction were calculated.The results show that when the wall temperature is increased, the condensation rate, the heat transfer rate and the thickness of the condensate film decrease. When the Reynolds number of mixed gas is increased, the condensation rate and heat transfer rate of flue gas increase, and the thickness of condensation film decreases. When the share of steam in flue gas decreases, the condensation rate and heat transfer rate Decrease, the thickness of the condensate film is not significantly reduced.