Supercritical DC furnace synthesis type coordinating control method

Abstract

The invention relates to a comprehensive method for harmonizing and controlling a supercritical monotube boiler, comprising the steps as follows: 1) logic configuration of a traditional harmonizing and controlling system is carried out, the differential signal of the practical load given value is added in main control circuit of the boiler of the traditional harmonizing and controlling system, and interfaces are preserved for an increment-typed state observer, an inertia suppressor and a heat value observer; 2) the logic configuration of the increment-typed state observer is carried out and the output thereof is led into the traditional harmonizing and controlling system so as to be used as a feedforward signal for controlling the combustion rate; 3) the logic configuration of the inertia suppressor is carried out and the output thereof is led into the traditional harmonizing and controlling system so as to be used as the feedforward signal for controlling the combustion rate; 4) the logic configuration of the water-supply increment-typed state observer is carried out and the output thereof is led into the traditional harmonizing and controlling system so as to be used as a feedforward signal for controlling the water-supply; 5) the heat value observer is added in the heat value calculation circuit of the traditional harmonizing and controlling system, thus leading the heating-value signal of the quantity of the coal entering the boiler to be corrected. The method obtains excellent control effect during the controlling to the supercritical monotube boiler.

Description

technical field [0001] The invention relates to a thermal automatic control method, in particular to a comprehensive coordinated control method for a supercritical DC furnace. Background technique [0002] With the continuous development of my country's electric power industry, the generating capacity of unit thermal power generating units has also been greatly improved. The current unit thermal power generation unit has changed from the original 300MW subcritical steam drum furnace to the 600MW supercritical DC furnace and 1000MW ultra-supercritical DC furnace. However, the control of the supercritical DC furnace is still a relatively new research field in the field of thermal automatic control in my country, and because the supercritical DC furnace has no steam drum, the working medium flow and energy flow of the supercritical unit are coupled with each other, so that in each control Loops, such as feed water, steam temperature, and load control loops, have strong nonlinea...

AI Technical Summary

Problems solved by technology

However, the control of the supercritical DC furnace is still a relatively new research field in the field of thermal automatic control in my country, and because the supercritical DC furnace has no steam drum, the working medium flow and energy flow of the supercritical unit are coupled with each other, so that in each control There is a strong nonlinear coupling between loops, such as feed water, steam temperature and load control loops

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