基于数值模拟的烘房加热通风方案优选

Optimal Solution for the Heating and Ventilation of Drying Room Based on Numerical Simulation

使用Airpak软件,对集装箱烘房内气体流动传热问题进行非稳态模拟计算。针对两种不同送风方案,计算得到了烘房内气流的各种场分布(流速、压力、温度、空气龄等)。重点考查了箱体表面的温度场、温升和空气龄随加热时间的变化。所研究的两种烘房送风方案中,方案1是从烘房底部送风,方案2则是把送风口位置抬高到集装箱内部送风,其他条件相同。计算结果表明,与方案1相比,方案2温度场分布更均匀,温度升高更快且空气龄较小(尤其在死角位置)。可见采用方案2能较好地保证烘干质量,提高烘干速度,缩短箱体死角位置的加热时间,降低烘干能耗。

By using the software of Airpak, unsteady air flow and heat transfer in a drying room used for containers are simulated with two different schemes of air supply. The transient numerical solutions are obtained for air flow within the drying room, including flow speed, pressure, temperature, mean age of air, etc. The analysis focuses on temperature field distribution, temperature rise, and the mean age of air surrounding the container surface changing with heating time. Two air supply schemes are that scheme one with air inlets located on the ground under the container and scheme two with just air inlets raised into the container, the rest of factors remaining unchanged. Calculation results show that comparing with scheme one, in scheme two, the temperature field distribution is evener, temperature raises more quickly, and the mean age of air is smaller, especially in critical places where it is difficult to dry. It could be concluded from the results that scheme two is the scheme that should be selected for better drying quality, shorter drying time, and less energy consumption.