Analysis and Treatment of Abnormal Water Level on the Steam Side of No.7 Low-pressure Heater
In recent years,many thermal power plants have participated in the depth peaking of the grid.During the depth peaking of the unit,high water level alarm occurs frequently on the steam side of low pressure heater No.7,and the emergency trap of low pressure heater No.7 is opened in parallel.It will cause adverse effects such as lower heat exchange efficiency of No.8 low pressure heater,higher steam side temperature of condenser and deterioration of vacuum of unit.By analyzing the changes of other associated data during high water level alarm,whether the water level detection device is accurate and whether the relevant pipeline valve is abnormal.It is found that the high water level alarm is mainly caused by the increase of condensation water at low load and the small pressure difference on the steam side of No.7 and No.8 low pressure heater,which makes the condensate water can not be discharged to No.8 low pressure heater through the normal drain pipe in time.This paper takes corresponding countermeasures to deal with it.Ensure that the steam side water level of No.7 low pressure heater is kept stable during depth peaking.
depth peakinghigh water levelhydrophobicpressure difference
万方数据
维普
