Pressure control method for deaerator

Abstract

The invention aims to provide a pressure control method for a deaerator, which comprises the following steps of: determining a pressure range and a target value of the deaerator according to historical pressure data of the deaerator; two deaerator pressure monitoring sensors are adopted, and the pressure value of the deaerator at the t moment is obtained; averaging the pressure values of the two deaerators at the t moment to obtain a pressure average value of the deaerators; the opening degree of the condenser water level recirculation regulating valve at the t moment is obtained and multiplied by a correction coefficient to be converted into a correction value; subtracting the average pressure value of the deaerator at the t moment from a target value, and then taking an absolute value to obtain a deviation value; converting the deviation value into a proportionality coefficient through linear processing; the opening degree of the pressure regulating valve of the deaerator is output through operation, the pressure regulating valve of the deaerator is controlled in real time, and then pressure control over the deaerator is achieved. According to the invention, the pressure measurement error of the deaerator can be reduced; the opening degree of the water level recirculation regulating valve of the condenser is converted into a corrected value, so that the control precision can be improved, and the pressure of the deaerator can be quickly and accurately controlled.

Description

technical field [0001] The invention relates to a boiler control method, in particular to a deaerator control method. Background technique [0002] The deaerator is one of the key equipment of the boiler control system. Its function is to heat the feed water to the saturation temperature corresponding to the working pressure of the deaerator, remove oxygen and other gases dissolved in the feed water, and prevent and reduce boiler feed water pipes and economizers. and corrosion of other ancillary equipment. If the pressure of the deaerator is not properly controlled, the deaeration capacity will be poor, which will cause corrosion to the boiler feed water pipe, economizer and other auxiliary equipment. Corrosion will enter the boiler, deposit or attach to the boiler tube wall and heating surface, forming iron scale that is insoluble and poor in heat transfer. When the pipeline is severely corroded, pipeline explosion accidents are likely to occur. Therefore, it is necessary...

AI Technical Summary

Problems solved by technology

If the deaerator pressure is not properly controlled, resulting in poor deaeration capacity, it will cause corrosion to boiler feed water pipes, economizers and other auxiliary equipment

Corrosion will enter the boiler, deposit or attach to the boiler tube wall and heating surface, forming iron scale that is insoluble and poor in heat transfer. When the pipeline is severely corroded, pipeline explosion accidents are likely to occur

Images