Boiler flue gas waste heat recovery device

By designing horizontal and vertical cleaning components in the boiler flue gas waste heat recovery device, the scale inside the heat exchange tubes and connecting pipes is automatically cleaned, solving the problem of difficult scale removal and ensuring stable operation and efficient heat transfer of the device.

WO2026108285A1PCT designated stage Publication Date: 2026-05-28HUANENG YAKESHI POWER GENERATION CO LTD
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Patent Information

Application Number
PCT/CN2025/116411
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-11-21
Filing Date
2025-08-22
Publication Date
2026-05-28

AI Technical Summary

Technical Problem

In existing boiler flue gas waste heat recovery devices, scale buildup inside the heat exchange tubes is difficult to clean, affecting heat transfer efficiency and potentially causing blockages.

Method used

The design incorporates horizontal and vertical cleaning components, including push rods, lifting rods, and sealing components. These components automatically clean the dirt inside the heat exchange tubes and connecting pipes through mechanical movement, and centrally process the cleaned dirt through the sealing components.

Benefits of technology

It enables timely and automatic removal of dirt inside heat exchange tubes and connecting pipes, maintaining long-term stable operation and efficient heat transfer of the device, and extending the service life of the device.

✦ Generated by Eureka AI based on patent content.

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Abstract

A boiler flue gas waste heat recovery device (400), relating to the technical field of boilers, comprising: a mounting unit (100), which comprises a base (101), a heat exchanger (102) and a dust collecting box (103) that are arranged on the base (101), and five groups of heat exchange tubes (104) horizontally arranged in the heat exchanger (102); a cleaning unit (200), which comprises a horizontal cleaning assembly (205) and a vertical cleaning assembly (206), wherein the horizontal cleaning assembly (205) and the vertical cleaning assembly (206) are both engaged with the heat exchange tubes (104); and a collection unit (300), which comprises an inclined plate (301) arranged inside the dust collecting box (103), a dust discharge port (302) arranged at a position close to the bottom on the other side of the dust collecting box (103), and a blocking assembly (303) arranged in the dust collecting box (103) and engaged with the heat exchange tubes (104). The provision of the horizontal cleaning assembly, vertical cleaning assembly, and blocking assembly ensures long-term stable operation of the device, prolongs the service life of the device, and achieves better performance.
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Citation Information

Patent Citations

  • Scattered cooling device for flue gas pipeline of bag type dust collector

    CN117899584A

  • High-temperature flue gas waste heat utilization steam boiler

    CN118346969A

  • Boiler flue gas waste heat recovery device

    CN119713921A

  • Steam boiler tail gas collecting device

    CN212511226U

  • Flue gas waste heat recovery device for gas turbine power plant boiler

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