Secondary air closed-loop optimization control system based on air register resistance coefficient

Abstract

The invention relates to a secondary air closed-loop optimization control system based on an air register resistance coefficient. The secondary air closed-loop optimization control system comprises a secondary air precise control module used for building a mapping relation between the secondary air register opening degree and the air volume of each layer, a boiler combustion analysis module used for obtaining a characteristic value of a boiler combustion boundary and a characteristic value of a combustion effect, an intelligent modeling module used for establishing a neural network model between the characteristic value of the boiler combustion boundary and the characteristic value of the combustion effect, an optimization module used for obtaining an optimal solution through an optimization algorithm based on the established neural network model, and a closed-loop control module used for acquiring parameters in real time, inversely calculating the optimal value of the boiler secondary air register opening degree after the parameters are processed by the boiler combustion analysis module and the optimization module, and executing closed-loop control in a DCS. The secondary air closed-loop optimization control system can conduct dynamic real-time optimization to adapt to the change of the load, coal quality and operation mode of a power station boiler, and can greatly improve the automation level of the boiler, effectively improve the efficiency of the boiler and reduce the NOx emission concentration of a hearth outlet.

Description

technical field [0001] The invention belongs to the technical field of combustion optimization of pulverized coal boilers, and in particular relates to a secondary air closed-loop optimization control system based on damper resistance coefficient. Background technique [0002] The cold aerodynamic field is a test item that is often carried out after the boiler overhaul, and the secondary damper characteristic test is one of the important items. The traditional damper characteristic test method is: keep the pressure of the secondary bellows constant, adjust the damper opening to 100%, 75%, 50%, 25%, and 0% in turn, use the anemometer to measure the wind speed at multiple points of each nozzle, and then take The characteristic curve of each damper is obtained by drawing the damper opening and the dimensionless wind speed of each nozzle. This method can provide a reference for the leveling of the secondary air volume at each corner, but cannot provide further air distribution ...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a secondary air closed-loop optimization control system based on damper resistance coefficient to solve the problem that it is difficult to realize the automatic adjustment of the secondary air distribution of the active power plant boilers, and it is impossible to ensure the efficient cleaning of the boiler operation in real time

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