Control method and control system for cooling air system of dry deslagging unit of coal-fired power plant boiler

By designing a comprehensive feedforward-cascade-feedback control structure, the cooling air volume of the dry slag discharge unit is adjusted in real time, and the problem of inaccurate cooling air volume adjustment in the existing technology is solved, and the precise control of ash slag temperature and the improvement of system stability is achieved.

CN119665251APending Publication Date: 2025-03-21SOUTHEAST UNIV
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Patent Information

Application Number
CN202510126331.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-01-27
Publication Date
2025-03-21

AI Technical Summary

Technical Problem

In the prior art, the cooling air volume is not adjusted accurately when the slag quantity and slag temperature of the dry slag discharge unit change, resulting in low air leakage and heat exchange efficiency at the bottom of the furnace, and timely and stable control of the ash slag temperature cannot be achieved.

Method used

By obtaining real-time operation data, a comprehensive feedforward-cascade-feedback control structure is designed, including an outer ring slag temperature controller and an inner ring cooling air volume controller. Combined with a comprehensive feedforward controller, the cooling air volume is dynamically adjusted in real time and the cooling air volume is adjusted to achieve accurate and orderly wind control.

Benefits of technology

Accurate control of ash temperature is achieved, the heat exchange effect between ash and cooling air is improved, energy consumption is reduced, air leakage at the bottom of the furnace is reduced, and the system's response speed and stability is enhanced.

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Abstract

The invention discloses a coal-fired power plant boiler dry slag discharging unit cooling air system control method and system. The control method comprises the steps that S1, real-time operation data of a dry slag discharging unit are obtained; the real-time operation data comprises the slag tapping temperature, the slag falling section conveying belt ash temperature, the slag falling section conveying belt ash amount, the slag falling section conveying belt ash thickness, the fan power / cooling air door opening degree, the in-furnace cooling air volume, the in-furnace cooling air temperature and the cooling air initial temperature; s2, according to the obtained real-time operation data of the dry deslagging unit, a fan power / cooling air door opening degree instruction is obtained; and S3, the fan power / cooling air door opening degree is automatically controlled according to the fan power / cooling air door opening degree instruction. According to the method, the fan power / cooling air door opening degree can be adjusted in real time according to the slag quantity and the slag temperature, the cooling air quantity and the outlet ash temperature are accurately controlled, the ash temperature is stabilized within the target range, the stability of the system is enhanced when the boiler load changes or the slag quantity fluctuates, and the ash cooling effect is guaranteed.
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