Coal-air synchronous dynamic coordination control method for coal-fired unit

Abstract

The invention relates to a coal and air synchronous dynamic coordination control method for a a coal-fired unit. The method comprises the following steps that the function relation between unit loads and the designed coal feeding amount and the function relation between unit loads and the flue gas operation wet-based oxygen amount are determined respectively; regression is carried out to obtain theoretical wet flue gas amount and combustion-supporting dry air amount of unit mass fire coal, and actual combustion-supporting dry air amount of unit mass fire coal is calculated; whether the deviation of the predicted values of the combustion-supporting dry air amount and the generated wet flue gas amount of the total fire coal amount per hour is within an acceptable range is verified; an actual coal feeding lower calorific value is calculated; the combustion-supporting dry air quantity and outlet wet flue gas quantity are calculated; according to the load instruction target value of the future time point, the coal feeding variable quantity and the combustion-supporting dry air variable quantity are calculated; the running wet-based oxygen amount variation is obtained; and finally, the to-be-adjusted coal feed amount and the to-be-adjusted operation wet-based oxygen amount target value are obtained. According to the method, the adjustment following responsiveness of the combustion-supporting dry air amount is improved, the response delay time of the running wet-based oxygen amount at the outlet of the economizer is shortened, and the adjustment synchronism among the load, the fire coal and the combustion-supporting dry air is improved.

Description

technical field [0001] The invention belongs to the technical field of coal-fired units, and in particular relates to a coal-fired unit coal wind synchronous dynamic cooperative control method. Background technique [0002] Automatic Generation Control AGC (Automatic Generation Control) is an important function in the energy management system EMS (Energy Management System). In the AGC mode, the load adjustment of coal-fired units is frequent and the range is relatively large. In order to meet the flexible peak-shaving mode of 2% The requirement of fast load lifting rate of MCR / min and above, under the traditional serial sequential control logic mode, the combustion-supporting air volume into the boiler lags behind the acceleration and deceleration rate of the coal volume, thus breaking the air-coal balanced combustion atmosphere, resulting in the exit of the boiler economizer Flue gas nitrogen oxide concentration and operating wet-based oxygen fluctuate sharply. When the loa...

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Problems solved by technology

[0007] The purpose of the present invention is to provide a coal-fired unit coal air synchronous dynamic cooperative control method, which is used to solve the problem that the combustion-supporting air volume lags behind the coal supply adjustment during the rapid peak-shaving process of the unit

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