矿井扩散塔喷淋换热装置热质传递模型及参数优化

针对矿井扩散塔喷淋换热装置的能量回收问题,建立了空气-水之间的传热传质数学模型。利用四阶龙格-库塔方法,进行了传热传质的数值计算,分析了装置结构参数、工质初始状态参数对装置换热的影响,结果表明:装置内部换热以潜热为主,且装置底部潜热交换越充分,装置热回收率越高;对装置换热效果的影响,按装置计算高度、液滴粒径、迎面风速、水汽比和液滴初速度的次序,依次下降;迎面风速对装置换热效果有较大影响,应控制迎面风速,避免风吹水损失和实现充分的热质交换。

Parameters optimization and theoretical model of heat-mass transfer in a-spray heat exchanger attaching to a main fan diffuser

To overcome the problem of waste heat recovery by a spray heat exchanger in a main fan diffuser，the mathematical models of heat and mass transfer of air-water were deduced.The models were solved simultaneously by the fourth-order Runge-Kutta method to analyze the effects of structure parameters and the initial state of working fluid on the heat and mass transfer of the exchanger.The numerical results show that：① Latent heat transfer is the main type of heat transfer in the exchanger.The more extensive is the latent heat exchange at the bottom of the device，the higher is the heat recovery of the device.② As to the effect on the exchanger，the following factors are in descending order：the computing-height of device，droplet size，air velocity，the ratio of water-air，and initial droplet velocity.③ Air velocity has a great impact on heat transfer of the exchanger，and the air face velocity should be controlled，in order to avoid the loss of airflow blowing out water droplet and achieve completely heatmass transfer.