Dynamic control system and method for opening target value of secondary air damper of boiler

Abstract

The invention discloses a dynamic control system and method for an opening target value of a secondary air damper of a boiler. The dynamic control system comprises a first control logic module, a second control logic module, a controller, an adder and a collecting module, wherein the collecting module is used for collecting an AGC instruction issued by an electric energy management system; the output end of the collecting module is connected with the input end of the second control logic module, and the output end of the second control logic module is connected with the output end of the firstcontrol logic module and the input end of the adder; the output end of the adder is connected with the input end of the controller, and the output end of the controller is connected with the controlend of the secondary air damper. The dynamic control system can effectively improve the steam temperature character in the variable load process of the boiler in the state of air grading combustion, prevent overtemperature or serious lack of temperature of steam of the boiler, significantly improve the operation safety and economy of the boiler.

Description

technical field [0001] The invention belongs to the field of thermal power generation, and relates to a system and method for dynamically controlling the opening degree target value of a secondary air damper of a boiler. Background technique [0002] Air staged combustion is the mainstream technology for tangentially fired pulverized coal boilers to reduce the concentration of NOx. In the air staged combustion state, the combustion process of the fuel is elongated, which will cause the steam temperature parameters to change drastically during the boiler load change process, and it is easy to cause overheating of the steam temperature when the load is added, or the seriously low steam temperature when the load is reduced, which is harmful to the boiler Significant adverse effects on safety and economy of operation. Contents of the invention [0003] The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art, and provide a system a...

AI Technical Summary

Problems solved by technology

In the air staged combustion state, the combustion process of the fuel is elongated, which will cause the steam temperature parameters to change drastically during the boiler load change process, and it is easy to cause overheating of the steam temperature when the load is added, or the seriously low steam temperature when the load is reduced, which is harmful to the boiler Significant adverse effects on the safety and economy of operation

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