矿井排风热回收上喷淋液滴运动模型及其优化

Motion model and optimization calculation of droplet in up-jet spraying heat exchanger attached to mine fan diffuser

为了减小矿井排风热回收装置的水损失量,设计了上喷式矿井排风热回收装置。通过液滴受力及运动分析,计算了不同迎面风速u_a下液滴不被吹飞的临界直径,以及不同迎面风速、液滴粒径d与液滴初速度u_d下,液滴最大上升高度。当u_d<2u_a时,液滴最大上升高度主要由液滴初速度决定,迎面风速次之,液滴粒径影响很小;当u_d>3u_a时,液滴最大上升高度由液滴粒径、液滴初速度、迎面风速共同决定。

This paper is an effort to reduce the amount of water loss occurring in a spray heat exchanger attached to a mine fan diffuser by designing an up-jet spraying heat exchanger.This design is performed by analyzing the way droplets are subjected to forces and motion,calculating the critical diameters able to prevent the droplets from being blown away,when exposed to different headwind velocities,and numerically calculating the maximum height at which the droplets rise,when subjected to different headwind velocities,droplet diameters,and different initial droplet velocities.The calculation suggests that in the case of ud ＜ 2ua,the maximum rise height of droplets h is determined by a decreasing degree from ud,to ua,and the droplet diameter d; in the case of ua ＞3ua,h is jointly determined by ud,ua,and d.