加热器挡水板结构可靠性分析

Analysis on the Reliability of the Impingement Plate in Heater

加热器是发电厂常见的换热设备,加热器壳体内尾部的挡水板对于缓冲较高流速的疏水冲刷,并使疏水经过缓冲平稳地注入具有重要作用。由于来自管道的疏水流速较高、冲击力较大,且在特定的激振频率下,会使挡水板的振幅增大,产生应力变化。为确定挡板的受力,应对挡水板结构进行应力和疲劳分析,通过对流体冲击载荷的计算,才能确定牢固且合理的挡板结构。

Heater is a common heat exchange equipment in power plant. It is very important for the impingement plate at the end within heater to protect the heat exchange tubes in the heater against flushing of drain with high flow speed and make the drain steady filling in the heater. The vibration of impingement plate will be increased which will make variable stress under special active frequency because of high flow speed and large impact force of the drain from pipe. Stress and fatigue analysis shall be made so as to determine the forced point of impingement plate based on the calculation of fluid impacting load. Thus, strong and reasonable plate structure could be determined.