A drum-type asphalt mixing equipment flue gas waste heat recovery system

By designing an inner and outer layer heat exchange system with staggered distribution of through holes and spiral blades for flow guidance, the problem of uneven utilization of flue gas heat in drum-type asphalt mixing equipment was solved, realizing the tiered distribution and efficient utilization of heat, and improving the adaptability and heat exchange efficiency of the equipment.

CN122170674APending Publication Date: 2026-06-09HUNAN YUNYANG ASPHALT PAVEMENT CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HUNAN YUNYANG ASPHALT PAVEMENT CO LTD
Filing Date
2026-03-31
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

The existing flue gas treatment system of drum-type asphalt mixing equipment fails to achieve tiered distribution and utilization of heat according to the flue gas temperature gradient and different heat demand, resulting in low heat utilization efficiency.

Method used

A flue gas waste heat recovery system including an inner and outer heat exchange system was designed. Through staggered through holes, spiral blades for flow guidance and transmission mechanism, the flue gas and heat exchange water are distributed in stages. A cleaning mechanism is also provided to prevent particulate matter accumulation and improve heat exchange efficiency.

Benefits of technology

It achieves a stepped distribution of recovered heat to meet different temperature requirements, improves adaptability and practicality, avoids energy waste, and ensures long-term heat exchange performance.

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Abstract

The present application relates to the field of asphalt mixing, especially to a drum-type asphalt mixing equipment flue gas waste heat recovery system. The drum-type asphalt mixing equipment flue gas waste heat recovery system comprises a flue gas pipeline, which is composed of a straight pipe part, a corrugated part and a connecting part, one corrugated part is fixedly connected to each end of the straight pipe part, and one connecting part is fixedly connected to the end of each of the two corrugated parts; a plurality of hollow rings are arranged, which are fixedly connected to the straight pipe part and are equidistantly distributed in the straight pipe part, and a solid ring is arranged between every two adjacent hollow rings; and an outer layer stepped heat exchange system is arranged on the plurality of hollow rings and the plurality of solid rings. The temperature of the hot water discharged from the infusion pipe is adjusted within a preset range, the recovered heat is distributed in steps, the demand for hot water of different temperatures in the actual use process is met through further adjustment, the adaptability and practicality are improved, and energy waste caused by cooling or heating after recovering heat is avoided.
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