间接换热式列管回转干燥机换热系数的确定及研究

Determination of Heat Transfer Coefficient in a Rotary Tube Dryer

提出了一种适用于间接换热式列管回转干燥机换热系数的测定方法,建立了间接换热式列管回转干燥试验台,并利用该试验台分析并获得了列管的换热系数随筒体转动的变化规律,以及转速、填充率等参数变化对换热系数的影响规律。实验结果表明,不同径向位置的列管具有不同的换热系数,且同一根列管表面与物料颗粒的换热系数也随其所在的周向位置而改变。

This paper presents an experimental method to determine the heat transfer coefficient between the tubes＇ surface and material in a rotary tube dryer. A unique test platform was designed and installed. The experiments were performed to analyze the influence of such parameters as rotary-speed and material filling ratio on the tubes＇ heat transfer coefficient. The results show that the heat transfer coefficient varies with both radial and circumferential position.