Based on the purpose of optimizing boiler shutdown and maintenance process in thermal power plant

this paper analyzes the principle of boiler system corrosion during shutdown and maintenance of 600 MW coal-fired units. In view of the problems such as steam water blockage in the heat exchange pipes during startup and large temperature difference between the heat exchange pipes caused by improper shutdown and maintenance measures during frequent startup and shutdown of boilers in thermal power plants

the improvement measures are proposed After that

the optimized shutdown maintenance measures for the operation of pressure drainage of the boiler are as follows: the maximum temperature difference between the horizontal tube walls of the final superheater is 33.58 ℃

and only one temperature is less than 85 ℃. Compared with that before optimization

the temperature difference between the horizontal tube walls of the final superheater is obviously smaller

which ensures that the temperature difference between the horizontal tube walls of the final superheater is normal and there is no water accumulation in the tube during the next start-up.