Coal supply system and control method for deep peak regulation of coal-fired unit

By designing an independent peak-shaving coal bunker and coal feeding structure, combined with a CO2 inerting system and a sealing air system, the problems of rapid and safe coal type switching during deep peak shaving of coal-fired units were solved, achieving flexible combustion control and stable combustion at low loads, and reducing the cost of retrofitting.

CN122429375APending Publication Date: 2026-07-21XIAN THERMAL POWER RES INST CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
XIAN THERMAL POWER RES INST CO LTD
Filing Date
2026-05-06
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

Existing coal-fired power units face challenges in deep peak shaving processes, including long coal type switching times, high retrofit risks, and system complexity, making it difficult to meet the requirements for rapid response and safety.

Method used

It adopts an independent peak-shaving coal bunker and coal feeding structure, and realizes rapid coal type switching through parallel coal supply and valve switching. Combined with CO2 inerting system and sealing air system, it ensures the safety and stability of coal type switching.

Benefits of technology

It achieves short coal type switching time, simple modification, and high safety, can meet the flexible combustion requirements of deep peak shaving, reduces modification costs, and improves the safety and flexibility of system operation.

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Abstract

The present application relates to coal-fired power generation technology field, specifically to a kind of for deep peak shaving coal-fired unit coal supply system and control method, system includes including main coal bunker, peak shaving coal bunker and coal feed structure, coal feed structure includes main coal feeder, peak shaving coal feeder, main coal drop pipe and peak shaving coal drop pipe, main coal bunker discharge end connects main coal feeder input end, and main coal feeder output end connects main coal drop pipe one end, and peak shaving coal bunker discharge end connects peak shaving coal feeder input end, and peak shaving coal feeder output end connects peak shaving coal drop pipe one end, and main coal drop pipe and peak shaving coal drop pipe other end are connected by tee junction pipe mill input end, and main coal drop pipe is equipped with main road switch valve, and peak shaving coal drop pipe is equipped with peak shaving switch valve, and tee junction pipe export is equipped with total switch valve, and three switch valves are connected to DCS control system.The present application is simple, does not interfere with original coal bunker structure, coal variety switching speed is fast, reliability is high, satisfies the flexible coal supply demand under the condition of deep peak shaving.
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