基于强化传热和流阻特性的矿用空冷器结构优化

Structural Optimization of Mine Air Cooler Based on Enhanced Heat Transfer and Flow Resistance Characteristics

矿用空冷器作为井下水冷降温系统的末端设备,被广泛应用于各类高温矿井中。针对现有矿用空冷器换热效率及冷量利用率低的问题,采用理论分析和数值模拟相结合的方法,从管程和壳程两个角度出发,对表面式空冷器的结构进行了优化,对比了光管空冷器和波纹管空冷器的传热性能,揭示了管程波峰高度以及壳程管道排列方式对于矿用空冷器综合性能(传热性能和流阻特性)的影响。结果表明:波纹管空冷器相较于光管空冷器具有更好的传热性能;改变波高可以使传热特性提高约24%~135%,但同样会使管内流动阻力增大176%~767%;在所模拟的5种波峰高度内,波峰高度为3 mm的波纹管具有最佳的综合性能,并且在雷诺数为4 977时达到最佳性能,综合评价因子达到最大值1.27;在4种管道排列方式中,管道叉排相较于传统的顺排方式,可以使得换热量提高约13%。研究成果对于提高矿用空冷器的传热效率,改善井下高温热环境具有一定的参考意义。

As the terminal equipment of underground water cooling system,mine air cooler is widely used in all kinds of high-temperature mines.In view of the low heat exchange efficiency and cooling capacity utilization of existing mining air coolers,the heat transfer process of surface air coolers is studied from the perspective of tube side and shell side by combining theoretical analysis and numerical simulation.The heat transfer performance of smooth tube air coolers and corrugated tube air coolers is compared,the influence of the wave crest height of the tube side and the arrangement of the shell side tubes on the comprehensive performance(heat transfer performance and flow resistance characteristics)of the mine air cooler is revealed.The results show that the corrugated tube air cooler has better heat transfer performance than the smooth tube air cooler.Changing the wave height can improve the heat transfer characteristics by about 24%~135%,but also increase the flow resistance in the tube by about 176%~767%.Among the five simulated wave crest heights,the bellows with a wave crest height of 3 mm has the best comprehensive performance,and reaches the best performance when the Reynolds number is 4977,the comprehensive evaluation factor reaches the maximum value of 1.27.Among the four kinds of pipe arrangement,the heat exchange can be increased by about 13%compared with the traditional in-line arrangement.The research results have certain reference significance for improving the heat transfer efficiency of mine air cooler and improving the high-temperature thermal environment underground.