矿井回风扩散塔内气-水雾热交换数值模拟

Numerical Simulation for Gas-water Mist Heat Transfer in Mine Return Air Diffusion Tower

通过数值模拟分析进行了矿井回风扩散塔内气-水雾换热规律的研究。针对回风换热扩散塔原型,建立了扩散塔数值模拟的简化三维物理模型,在已定扩散塔基本参数的基础上设定了合理的边界条件。应用欧拉-拉格朗日法模拟了水气比对塔内气-水雾逆流换热的影响分析,得到了不同工况下塔内风流温度场、速度场、压力场、雾滴运动轨迹的变化趋势。模拟结果表明,在其他参数一定的情况下,水气比在0.9时,塔内气-水雾换热效果较好,阻力合适,总体性能最佳,与实际应用工程相吻合,进而从理论上验证了工程应用中水气比选取的正确性。

The laws of air-water mist heat transfer in the mine return air diffuser are studied by numerical simulation. According to the prototype of return air diffuser,a three-dimensional and simplified numerical model is established. On the basis of the confirmed diffuser’s basic parameters,a reasonable boundary condition is set. The effect of water-air ratio on the heat transfer performance of air-water mist counter flow in the diffuser is simulated by Euler-Lagrange method,and the trends of airflow temperature field,velocity field,pressure field and droplet counter flow trajectory under different conditions in the diffuser is got. The results show that air-water mist heat exchange efficiency is better than the others in unchanged parameters when water-air ratio is 0. 9. It is associated with the appropriate resistance,the best overall performance and the good agreement with actual project. Then the correct selection of the water-air ratio in engineering application is theoretically proved.