热管换热器回收煤矿回风余热预热矿井进风研究

Study on Preheating Mine Ventilation Airflow by Return Air Heat Recycled by Heat Pipe Heat Exchanger

以矿井需风量8 000 m3/min为例,运用热管理论和传热理论建立矿井回风焓变放热方程和热平衡方程,并利用计算流体动力学分析软件Fluent对余热回收系统换热效果进行数值模拟。研究结果表明:当矿井进风量为8 000 m3/min,新鲜风流温度高于-29℃时,热管换热器可以利用回收的回风余热满足新鲜风流的预热要求;通过数值模拟分析可知,对于不同需风量的矿井,当新鲜风流的温度高于临界温度时,热管换热器回收的回风预热便可以独立完成对新鲜风流的预热。

In this article, taking the mine air volume 8 000 m3/min as an example, mine return air enthalpy heat equation and heat balance equation were built based on the heat pipe theory and heat transfer theory, computational fluid dynamics analysis software Flu- ent is used to carry on numerical simulation for the effect of waste heat recovery system. The study showed that the temperature of fresh air was larger than -29 ℃ when the mine air volume was 8 000 m3/min, then heat pipe heat exchanger can met the preheat require- ments of fresh air with recycled return air heat. By the numerical simulation analysis, for different air volume coal mines, when the temperature was larger than the stagnation temperature, the return air preheating recycled by heat pipe heat exchanger can complete the warm - up of the fresh air independently.