蛋白粉尾气余热回收喷淋塔的热工特性研究

Study on spray tower performance used for waste heat recovery of protein powder exhaust gas

大豆蛋白粉干燥工艺过程产生的高温尾气中蕴含着大量显热和潜热,而无填料、垂直逆流喷淋塔可以深度回收尾气中的余热。对此建立了喷淋塔的数值模型,并通过实验验证其准确性;应用所建模型,分析喷淋高度、入口水温、喷淋密度、尾气流速和尾气入口湿球温度对喷淋塔热回收性能的影响规律,进而获得了喷淋塔在实验工况范围内的换热效率曲线及经验关联式,为尾气喷淋热回收塔的优化设计与工程应用提供了分析工具。

The drying process of soybean protein powder produces high-temperature exhaust gas with a large amount of sensible heat and latent heat,and a kind of vertical countercurrent spray tower could largely recover the waste heat.The numerical model of the spray tower was developed and validated with the experimental data.On this basis,the effects of nozzle height,water inlet temperature,exhaust velocity,spray density and gas inlet wet bulb temperature on the heat recovery performance of spray tower were analyzed.Com bined with theoretical analysis,the heat exchange efficiency curve and the empirical equations within the scope of experimental conditions are obtained,which provide a basic tool for the design and engineering application of the high-temperature exhaust gas heat recovery spray tower.