Method and device for determining control relationship between temperature of hearth outlet partition of boiler and air doors

Abstract

The invention provides a method and device for determining a control relationship between temperature of a hearth outlet partition of a boiler and air doors. The method comprises the steps that for adesignated load section, single secondary air door performance testing is carried out on a front wall and a rear wall of a target boiler to obtain a first temperature change curve of the hearth outletpartition of the target boiler under different baffle opening degrees of different secondary air doors, single burn-out air door performance testing is carried out on the front wall and the rear wallof the target boiler to obtain a second temperature change curve of the hearth outlet partition under different baffle opening degrees of different burn-out air doors, and data fitting is carried outon the first temperature change curve and the second temperature change curve to obtain a first transfer function for representing the corresponding control relationship between the temperature of the hearth outlet partition and the single air door. The air doors comprise the secondary air doors or the burnt-out air doors.

Description

technical field [0001] The present invention relates to the technical field of automatic control, and more specifically relates to a method and a device for determining the corresponding control relationship between boiler furnace outlet zone temperature and dampers (secondary damper and burnout damper). Background technique [0002] The combustion situation of boilers in thermal power plants is closely related to the safety of boiler operation, saving coal-fired resources, and reducing NOx emissions. Traditional contact or non-contact boiler furnace temperature measurement technologies have limited measurement temperature range and poor reliability. Due to the high error and other problems, it has not been able to be popularized and applied. [0003] In recent years, the measurement method of furnace temperature field based on sound wave or laser temperature measurement technology has been greatly developed. It has made up for the shortcomings of boiler furnace temperature ...

AI Technical Summary

Problems solved by technology

[0004] However, due to the uncertainty of the corresponding control relationship between the temperature of the furnace outlet zone and each damper (secondary damper or burnout damper), it is difficult to achieve uniform control of the furnace outlet temperature in industry, and the practical value is greatly reduced.

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