汽轮发电机氢气冷却器换热特性数值模拟研究

Turbine generator hydrogen cooler Numerical Simulation of Heat

进入21世纪以来,随着我国经济的飞速发展,电力需求急速增长,电力工业进入了大机组、高参数、大电网的阶段。随着汽轮发电机容量的日益增大,各部分的温升也随之增加,要保证发电机安全可靠地运行,必须采用有效的冷却技术以提高其散热强度,使发电机的各部分温升控制在允许范围内,从而减少热变形和减轻磨损,提高绝缘寿命。另外,提高冷却技术可以在换热量相同的情况下降低冷却器材料的消耗,减少设备尺寸,为厂房建筑、运输带来便利,因此,对于各类大型发电机来说,对其冷却技术的研究具有重要的意义。本文根据大型电站汽轮发电机组氢气冷却器的运行工况,利用CFD计算方法对穿片式氢气冷却器的流场与温度场进行数值模拟分析,以期为穿片式氢气冷却器结构优化和应用提供依据。

In the 21 st century, as China's economy developping rapidly, the rapid growth in demand for electricity, power industry has entered a phase with large unit, high- parameter and big power grid. With the increasing capacity of the turbo-generator, the temperature of all parts increases. In order to ensure the safety and reliability when the generators operate, it is necessary to adopt effective cooling technology to enhance the strength of heat transfer, so that the temperature of various parts in genetators can be controlled in the extent permitted, so as to reduce heat distortion, reduce wear and improve insulation life. In addition, improving the cooling technology can reduce the consumption of cooler materials, reduce the size of equipment and give the construction and transportation a great convenience. So that, for all types of large- scale generators, studying cooling technology is of great significance.According to the operation of the big power station hydrogen coolers in turbogenerators, the numerical simulation study by using CFD has been done about the flow field and temperature field for getting the characteristic curve of the heat transfer with a view to provide the basis for the structure optimization and application of the fin-and-tube hydrogen coolers.