Method and system for reducing carbon content of fly ash of boiler

Abstract

The invention discloses a method and system for reducing the carbon content of boiler fly ash, and the method comprises the following steps: collecting a plurality of historical operation parameters of a thermal power generating unit, and building a relation between a historical fire coal ash score and a historical fly ash carbon content; acquiring a fly ash carbon content value and a fire coal ash value of a thermal power generating unit boiler in real time; and based on the real-time thermal power generating unit fly ash carbon content numerical value and the coal ash value, a swing fire nozzle control strategy, a primary air pressure control strategy, a coal mill control strategy and a secondary air door control strategy are started respectively. The angle of the swing fire nozzle, the primary air pressure, the coal feeding amount offset of each coal mill and the opening degree and mode of a secondary air door are adjusted according to the real-time fire coal ash content and the fly ash carbon content, the fly ash carbon content is reduced on the premise that the combustion efficiency and safety of the boiler are guaranteed, and an effective means is provided for improving the quality of fly ash.

Description

technical field [0001] The invention relates to the technical field of boilers in thermal power plants, in particular to a method and a system for reducing the carbon content of boiler fly ash. Background technique [0002] The carbon content of fly ash is an important indicator to measure the combustion efficiency of the boiler. Excessive carbon content of the fly ash will increase the fuel consumption, prone to secondary combustion in the tail flue, and reduce the efficiency of the dust collector, which is related to the operating efficiency and safety of the boiler. At the same time, the carbon content of fly ash is also a key indicator that affects the quality of fly ash, which will affect the downstream market application of fly ash through indicators such as fly ash loss on ignition and water demand ratio. The market application of solid waste brings constraints and has a great negative impact on environmental protection. [0003] With the increasingly tense thermal c...

AI Technical Summary

Problems solved by technology

Obviously, the focus of the existing unit coordinated control method is to achieve load lifting and lowering under the specified load lifting rate, while ignoring the adjustment and control of boiler combustion efficiency, resulting in boiler efficiency often not in the best state, and at the same time, the carbon content of fly ash exceeds the standard it often happens

In addition, because the accuracy of the boiler fly ash carbon content measurement device is affected by factors such as changes in coal types, blockage of sampling pipes, and maintenance cycles, the measurement results cannot accurately and timely reflect the current boiler combustion conditions, and the control of boiler combustion and adjust the lack of effectiveness

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