Heat exchange flue and heat exchange equipment

By adopting a "sandwich" structure and narrow smoke door design in the heat exchange flue, the installation difficulty and thermal expansion and contraction problems caused by excessive smoke door size are solved, and the smoke gas is directly passed outside the heated surface to avoid condensation caused by heat exchange, and ensure that there is no accumulation of dust in the low-temperature section of the heated surface.

CN111750370BActive Publication Date: 2025-03-25马成果 +1
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Patent Information

Application Number
CN201910263998.7
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2019-03-28
Publication Date
2025-03-25
Estimated Expiration
2039-03-28

AI Technical Summary

Technical Problem

When the existing heat exchange flue reverses the direction of flue gas flow, the size of the smoke door is too large, making it difficult to manufacture, install and maintain, the thermal expansion and contraction effect is obvious, and the temperature of the flue gas after heat exchange is reduced easily leads to condensation; at the same time, the decrease in the flue gas flow rate leads to the problem of dust accumulation.

Method used

A heat exchange flue is designed, which adopts a "sandwich" structure, including the top and bottom smoke chambers and the middle heat exchange section. The heat exchange section is composed of the central heat exchange tube bundle and the left and right flue ducts. The smoke door is only installed in the left and right flue ducts. The smoke gas can pass through directly in the left and right flue ducts to avoid heat exchange with the heated surface.

Benefits of technology

The structure and size of the smoke door is simplified, the manufacturing and installation difficulty is reduced, the thermal expansion and contraction problem is avoided, the smoke temperature is ensured, and the smoke temperature is prevented, and the smoke door opening and closing is adjusted, the diversity of the smoke air flow path is achieved, ensuring that the low-temperature section of the heated surface does not accumulate dust.

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Abstract

The present invention relates to a heat exchange flue and a heat exchange device including the heat exchange flue, such as a boiler. The heat exchange flue has a top smoke chamber, a bottom smoke chamber and a heat exchange section located therebetween, and the heat exchange section includes a central heat exchange tube bundle and a left flue and a right flue located on both sides of the heat exchange tube bundle. The left and right flues each have a plurality of smoke doors, the smoke doors in each side flue are arranged vertically at intervals, and the corresponding smoke doors in the left flue and the right flue are horizontally aligned; each smoke door has a smoke door frame defining a smoke outlet and a smoke outlet opening and closing device capable of selectively opening and closing the smoke outlet. The corresponding smoke doors of the left and right side flues are connected to a substantially horizontal smoke partition plate, thereby defining a horizontal flue section together with the adjacent smoke doors and smoke partition plates.
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