Powder feeding control method and system for small powder bin

By comparing the boiler load-raising signal with the coal mill output signal in real time in the small powder bin powder feed control system, and determining the powder feed signal of the small powder bin, the problem of large delay time of the fuel control system during the rapid load-raising of the direct blowing boiler is solved, and the rapid response and dynamic matching of the boiler load is achieved.

WO2025081822A1 Publication Date: 2025-04-24HUAZHONG UNIV OF SCI & TECH
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Patent Information

Application Number
PCT/CN2024/094826
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2023-10-17
Filing Date
2024-05-23
Publication Date
2025-04-24

AI Technical Summary

Technical Problem

During the rapid load loading process, the fuel control system has a large delay time, which cannot quickly change the combustion rate in the furnace, and adapts to changes in external loads, resulting in lag in the combustion system regulation and affecting the rapid peak-shaving capability of the power plant boiler.

Method used

By obtaining the boiler load increase signal in the small powder bin feeding control system, calculating the objective function F(t), comparing the coal mill output signal B(t) and F(t), when B(t) cannot meet F(t), determining the small powder bin feeding signal f(t), and feeding powder to the boiler through the small powder bin, quickly changing the combustion rate in the furnace and increasing the boiler load.

Benefits of technology

It significantly shortens the response delay of the fuel system, can dynamically respond to load-up signals within 1 minute, improves the boiler's rapid response ability, meets the demand for rapid load climbing, and achieves rapid and accurate dynamic matching between the fuel system and the combustion system.

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Abstract

Provided in the present invention are a powder feeding control method and system for a small powder bin. The method comprises: step 1, acquiring a boiler load rise signal, and on the basis of the boiler load rise signal, determining an objective function F(t) for boiler load control, wherein t is a time sequence; step 2, acquiring a current output signal B(t) of a coal mill, wherein B(t) is a time-varying fuel quantity signal of an outlet of the coal mill starting from a start time; step 3, comparing B(t) with F(t): if B(t) cannot meet the fuel quantity requirement of F(t), executing steps 4 and 5, such that a small powder bin connected to a boiler starts to operate, and otherwise, the small powder bin not operating; step 4, determining a powder feeding signal f(t) of the small powder bin on the basis of the difference between F(t) and B(t), and further determining a powder feeding control signal f'(t) of the small powder bin; and step 5, on the basis of the powder feeding control signal f'(t) of the small powder bin, controlling the small powder bin to feed powder to the boiler, so as to quickly change the combustion rate inside a hearth, thereby improving the load of the boiler.
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