Flue gas treatment system and flue gas treatment method

By introducing a zoned self-cleaning function into the air preheater, and utilizing partition plates and a cold fluid inlet shut-off mechanism, the problems of air leakage, blockage, and corrosion in rotary air preheaters have been solved, thereby improving the waste heat recovery rate of flue gas and boiler efficiency, and reducing energy consumption.

CN120466695BActive Publication Date: 2026-07-24TIANJIN HUASAIER HEAT TRANSFER EQUIP
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Patent Information

Application Number
CN202510872351.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2020-12-15
Publication Date
2026-07-24
Estimated Expiration
2040-12-15

AI Technical Summary

Technical Problem

Existing rotary air preheaters suffer from air leakage, blockage, and corrosion, resulting in low waste heat recovery rate of flue gas, high energy consumption, and heavy load on downstream units.

Method used

An air preheater with zoned self-cleaning function is adopted. The cold fluid inlet header is divided into independent sub-headers by a partition plate and equipped with an independently controlled cold fluid inlet shut-off mechanism. Combined with counter-current heat exchange, the self-cleaning function is realized to prevent cold fluid from entering and clogging the channel, and hot fluid is used to remove adhering substances.

Benefits of technology

It effectively avoids ammonium bisulfate blockage and corrosion, improves flue gas waste heat recovery rate, reduces energy consumption and downstream unit load, and enhances boiler efficiency.

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Abstract

The present application relates to a flue gas treatment system and a flue gas treatment method using an air preheater with a partitioned self-cleaning function. The air preheater has a heat transfer module, a cold fluid inlet cut-off mechanism, and a partition plate. The partition plate is arranged in the shell cold fluid inlet header tank, which is divided into several shell cold fluid inlet sub-header tanks. Each shell cold fluid inlet sub-header tank is provided with a cold fluid inlet cut-off mechanism. Each cold fluid inlet cut-off mechanism can be independently controlled to open. By independently controlling the cold fluid inlet cut-off mechanism, the self-cleaning function of all heat transfer modules in the air preheater tank can be realized.
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