【摘要】 为提高粮食烘干过程中的能量利用率，建立基于薄层传热规律的管壳式换热器的仿真模型，以研究管程和壳程出口温度随入口参数的变化规律。烟气通过管程进入换热器，由于折流板的阻挡作用，在管程内呈现S形流动，流速和温度变化均匀，有利于传热。烟气的出口温度随着烟气的入口流速增大而升高，随空气入口流速的增大而降低；空气的出口温度随着空气入口流速的增大而降低，随烟气入口流速的增大而升高；传热系数随着烟气和空气入口流速的增大而增大。为适应不同种类谷物的烘干需求，建立了空气出口平均温度随入口参数变化的幂指数回归预测方程，该方程可以用于预测烘干机换热器的输出温度或指导换热器的设计。更多还原

【Abstract】 To improve the energy efficiency in the grain drying process,a simulation model of shell-and-tube heat exchanger based on the thin layer heat transfer is established to study the variation of the average temperature of the outlet of the shell and tube with the inlet parameters. The smoke enters the heat exchanger through the tube. Due to the curved baffle,the smoke flows as a S-shape in the tube with uniform flow velocity and temperature,which is beneficial to heat transfer. The average temperature in the outlet of the smoke decreases with the increase of inlet flow rate of smoke and increases with the increase of inlet flow rate of air;the average temperature of the air decreases with the increase of the inlet flow rate of air and increases with the increase of inlet flow rate of smoke. The heat transfer coefficient increases with the increase of smoke and air inlet flow rates. For different drying demands,a power exponential regression prediction equation for the average temperature of the air in the outlet with the variation of inlet parameters is established. It can be used to predict the output temperature of the heat exchanger and guide the design of the heat exchanger.更多还原