A flue gas waste heat recovery system for an oxy-combustion boiler

By using a double-layer shell-and-tube heat exchange unit, a gas-solid synergistic cleaning component, and a composite filtration system, the problems of improper isolation of hot and cold media and ash accumulation in the flue gas waste heat recovery system of oxygen-enriched combustion boilers have been solved, achieving efficient flue gas waste heat recovery and stable equipment operation.

CN122192039APending Publication Date: 2026-06-12ANHUI WEISHEN ENG TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ANHUI WEISHEN ENG TECH CO LTD
Filing Date
2026-04-13
Publication Date
2026-06-12

AI Technical Summary

⚠Technical Problem

The lack of an effective cascade isolation and flow equalization buffer mechanism for hot and cold media in the flue gas waste heat recovery system of oxygen-enriched combustion boilers leads to localized overcooling, causing acidic dew point corrosion and sticky ash accumulation. Traditional cleaning devices are inefficient, affecting equipment lifespan and operational stability.

⚗Method used

It adopts a double-layer shell-and-tube heat exchange unit and a gas-solid synergistic cleaning component, combined with a matrix linkage unit and a composite filtration system to achieve tiered isolation and uniform flow buffering of hot and cold media. It utilizes nickel-titanium shape memory alloy scrapers and microporous ceramic abrasive particles for pulse jet cleaning, combined with multi-stage filtration to achieve efficient flue gas purification and ash removal.

🎯Benefits of technology

It effectively eliminates the risk of cold-end corrosion, achieves uniform distribution and efficient cleaning of flue gas, improves system safety and stability, reduces equipment maintenance frequency, and increases heat exchange efficiency and equipment life.

✦ Generated by Eureka AI based on patent content.

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Abstract

The present application relates to the field of electronic equipment heat dissipation, especially to a flue gas waste heat recovery system for oxygen-enriched combustion boiler, comprising a flue gas recovery tank, a heat exchange tank fixedly installed on the upper end of the flue gas recovery tank, a gear box fixedly installed on the upper end of the heat exchange tank, a jacket fixedly installed on the bottom of the heat exchange tank, the jacket being communicated with an external water pipe, the heat exchange tank being internally provided with a plurality of groups of double-layer jacket pipe heat exchange units, the inner wall of the heat exchange tank being fixedly installed with a partition plate one for sealing, the upper side of the partition plate one being provided with a partition plate two for blocking water flow, a water flow cavity being formed between the partition plate two and the partition plate one for concentrating heat source medium after heat exchange; the present application is provided with a plurality of groups of double-layer jacket pipe heat exchange units and gas collecting assemblies, the "diffusion effect" of the positive cone collecting cover is used to uniformly radiate and distribute the flue gas to each inner pipe, the fluid mechanics principle of "diffusion-stabilization-constriction" is used to realize natural flow equalization without internal guide vanes, the waste heat is used to preheat the working medium, and the cold end corrosion risk is eliminated.
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