Supercritical CFB boiler deep peak regulation working condition smoke temperature optimization control system

The primary air bypass optimization system solved the problem of excessively low flue gas temperature under deep peak shaving conditions in CFB boilers, achieving improved boiler operation stability and efficiency, and avoiding bag filter clogging and increased induced draft fan power consumption.

CN121761331APending Publication Date: 2026-03-31山西京能吕临发电有限公司
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Patent Information

Application Number
CN202610113409.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-01-28
Publication Date
2026-03-31

AI Technical Summary

Technical Problem

Under the deep peak-shaving conditions of CFB boilers, the flue gas temperature drops significantly, leading to problems such as bag filter clogging, increased power consumption of induced draft fans, and unstable system operation. Existing flue gas bypass methods have disadvantages such as high flue gas temperature, high dust content, easy ash accumulation and wear, and high cost.

Method used

A primary air bypass optimization system is adopted. Through the sensing and monitoring module and the intelligent control module, the air volume of the primary air bypass duct is adjusted. Combined with the electric regulating damper and the protective pipe structure, the heat recovery of the air preheater and the flue gas temperature control are optimized.

Benefits of technology

Effective control of primary cold air volume reduces flue gas heat loss, avoids bag clogging caused by excessively low flue gas temperature, and improves boiler operation stability and efficiency.

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Abstract

The invention belongs to the technical field of supercritical CFB (circulating fluid bed) boilers, and particularly relates to a supercritical CFB boiler deep peak regulation working condition smoke temperature optimization control system which comprises a sensing monitoring module, an intelligent control module and a regulation execution module. The primary air bypass air duct is introduced from a primary cold air duct of the supercritical CFB boiler and is divided into two paths which are respectively connected into a primary hot air duct and a secondary hot air duct; according to the requirements of boiler load and smoke exhaust temperature, the air volume of primary cold air passing through the primary air bypass air duct can be effectively adjusted by adjusting the electric adjusting air door, so that effective control over the volume of the primary cold air flowing into the air preheater is achieved, heat loss in smoke is reduced, and the energy consumption is reduced. Therefore, the temperature reduction amplitude when the flue gas passes through the air preheater is reduced, and the problem of bag pasting caused by too low temperature when the flue gas passes through a bag-type dust collector is avoided.
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