Variable-load air-staged dynamic control system and method

Abstract

The invention provides a variable-load air-staged dynamic control method, belonging to the field of boiler control. The method is applied to a coal-fired boiler with an air-staged combustion system and comprises the following steps of: executing unit load change judgment in a variable-load operation state of the boiler to obtain a load change judgment result; according to the load change judgmentresult and a current boiler steam temperature deviation value, conducting system operation condition judgment, and generating a load change correction instruction and / or a steam temperature deviationcorrection instruction according to an operation condition judgment result; and according to the load change correction instruction and / or the steam temperature deviation correction instruction, adjusting a boiler air volume control air distribution mode under variable-load operation. According to the invention, air classification and synchronous steam temperature adjustment are achieved by takingboiler system operation parameter changes into consideration in a variable load operation state, so the method adapts to rapid load changes, and the adjusting speed and accuracy of the system are improved.

Description

technical field [0001] The invention relates to the field of boiler control, in particular to a variable-load air classification dynamic control system and a variable-load air classification dynamic control method. Background technique [0002] Implementing ultra-low emission transformation and improving unit operation flexibility are the two most important tasks of thermal power units in recent years. This is not only a policy requirement, but also a need for enterprises to improve their own competitiveness. The low-nitrogen combustion transformation with air classification as the main feature is an important guarantee for ultra-low emissions. However, under the background that thermal power units generally participate in deep peak regulation, there has been a problem that air classification adjustment and steam temperature adjustment are not synchronized during boiler load changes. , the root of which is that the traditional air staging adjustment is always based on the st...

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