A cold air duct structure design method for a thermal power unit and a structure system thereof

By optimizing the design using reinforced concrete materials and finite element analysis, the vibration and corrosion problems of the cooling ducts in thermal power plants were solved, improving the structure's vibration resistance and durability, and reducing maintenance costs.

CN122389459APending Publication Date: 2026-07-14SHANDONG ELECTRIC POWER ENG CONSULTING INST CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANDONG ELECTRIC POWER ENG CONSULTING INST CORP
Filing Date
2026-04-21
Publication Date
2026-07-14

AI Technical Summary

Technical Problem

The cooling ducts of thermal power plants are prone to vibration, wear and corrosion under the operation of fans and airflow pulsation, which leads to a reduction in structural integrity. Traditional steel structure ducts are prone to resonance, weld fatigue and corrosion, and have insufficient erosion resistance.

Method used

The cold air duct structure is designed using reinforced concrete. The cylinder and support foundation are optimized through finite element analysis. A multi-field coupling model is established to evaluate the dynamic response, ensuring that the natural frequency avoids the fan frequency, thus enhancing vibration resistance. The passivation film of concrete is also used for corrosion prevention.

Benefits of technology

It effectively avoids resonance risks, improves erosion and corrosion resistance, ensures structural safety and durability, and reduces maintenance costs.

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Abstract

The present application relates to the technical field of electric power engineering, and more particularly to a cold air duct structure design method for a thermal power unit and a structure thereof. The design method comprises: obtaining the elevations and cross-sectional dimensions of the air outlet of a primary air fan, the air outlet of a supply fan and the air inlet of a warm air heater; preparing the cross-sectional dimensions of both ends of the air duct cylinder, the cylinder cross-sectional change mode and the center point connecting line path; establishing a three-dimensional finite element model of the cylinder and performing thermal-flow-solid multi-field coupling calculation and analysis; extracting the cylinder stress and displacement to determine whether the current cylinder structure is optimal; if so, a three-dimensional finite element model of the air duct-pier-foundation system is established and dynamic calculation is performed; the system dynamic parameters and pier foundation stress and displacement are extracted to determine whether the current system is optimal; if so, the dimensions and reinforcement of the cylinder, pier and foundation are determined. The present application avoids the resonance risk of the air duct system, maintains the protective effect of concrete on the internal reinforcement and avoids the penetration of corrosive media.
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