Boiler oxygen amount wide-load optimization control system

Abstract

The invention relates to the technical field of power plant boiler oxygen amount control, and discloses a boiler oxygen amount wide-load optimization control system. The boiler oxygen amount wide-load optimization control system comprises a boiler, air supply equipment and a system fuzzy control module, and a boiler temperature field data acquisition module, a combustion characteristic acquisition module, a pulverized coal fineness data acquisition module and an in-boiler combustion condition feedback module are installed in the boiler. According to the boiler oxygen wide-load optimization control system, the optimal oxygen amount under different thermal loads of the boiler is determined according to the boiler temperature field, the combustion characteristics and the pulverized coal fineness, an advanced fuzzy control strategy is adopted, boiler oxygen amount control in wide-load automatic cruising is achieved, the optimal combustion condition of the boiler is kept, and the boiler efficiency is improved; the unit air supply amount is corrected in real time according to the unit oxygen amount, the stability of parameters in the unit load increasing and decreasing process is improved, and the precision of control over the air supply oxygen amount in the boiler is improved; and the economy of unit operation can be guaranteed, and the environmental friendliness of unit operation is improved.

Description

technical field [0001] The invention relates to the technical field of boiler oxygen control in a power plant, in particular to a boiler oxygen wide load optimization control system. Background technique [0002] Power plant boilers refer to medium and large boilers in power plants that provide steam turbines with a specified quantity and quality of steam. They are one of the main thermal equipment in thermal power plants. There are two types of circulating fluidized bed boilers, among which pulverized coal boilers are widely used. [0003] Under the existing technical conditions, boiler air supply control generally directly calculates the required air supply air volume control signal through the load or total fuel volume, and then corrects the oxygen volume on this basis. However, even after the actual air supply air volume curve is optimized and adjusted, it still remains Unable to meet the impact of fluctuations in ambient air pressure, coal quality, etc., especially aft...

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Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention provides a boiler oxygen wide-load optimization control system, which determines the optimal oxygen content of the boiler for different heat loads according to the boiler temperature field, combustion characteristics and coal fineness, and adopts advanced fuzzy control The strategy realizes boiler oxygen control during wide-load automatic cruise, maintains the best combustion conditions of the boiler, improves boiler efficiency, and the air supply volume of the unit is corrected in real time according to the oxygen content of the unit, improving the stability of parameters during the process of unit lifting and lowering load, and Improve the accuracy of oxygen supply control in the boiler, and can ensure the economical operation of the unit, reduce the generation of nitrogen oxides, and improve the environmental protection performance of the unit operation, and solve the current poor control accuracy of the oxygen supply in the boiler , so that the oxygen content in the boiler is insufficient, and affect the efficiency of the boiler, and at the same time increase the formation of nitrogen oxides, and lead to long-term economic loss and environmental protection control pressure, and also solve the problem of poor parameter stability in the process of unit lifting and lowering load

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