井下大型排水泵站电动机外部水冷却系统设计

Engineering practice of external water cooling system for electric motorsin large underground drainage pump stations

井下大型排水泵站装机容量大,设备发热量大,散热条件差,为防止泵站内空气温度超限,水泵机组配套水冷电动机,采用外部水冷却系统对电动机进行降温,将电动机工作过程中产生的热量排出至泵站外。文章以雅店煤矿实际工程为例,通过计算冷却系统所需换热能力、冷却水量,提出开式直排和二次换热两种方案,并经技术经济方案对比,确定采用二次换热冷却系统方案。依据确定的技术方案和设计原则,笔者对冷却系统换热、加压、过滤、循环、定压补水、控制等设备进行计算选型。

The large underground drainage pump station has a large installed capacity,high equipment heat generation,and poor heat dissipation conditions.In order to prevent the air temperature in the pump station from exceeding the operation limit,the water pump unit is equipped with a water-cooled electric motor,and an external water cooling system is used to cool the electric motor.The heat generated during the operation of the electric motor is discharged outside the pump station.Based on engineering practice,the required heat transfer capacity and cooling water volume of the cooling system are calculated,and two schemes are proposed:open direct discharge and secondary heat exchange.After comparing the technical and economic schemes,it is determined to adopt the secondary heat exchange cooling system scheme.Based on the determined technical scheme and design principles,the equipment for cooling system heat exchange,pressurization,filtration,circulation,constant pressure water replenishment,and control are selected.