A process calculation method for a screw baffle heat exchanger

By distinguishing the flow state of the spiral baffle heat exchanger and correcting the Nusselt number with a correction factor, the problem of insufficient calculation accuracy in the existing technology is solved, and more accurate heat transfer coefficient calculation is achieved.

CN122287448APending Publication Date: 2026-06-26QINGDAO CHANGLONG POWER EQUIP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
QINGDAO CHANGLONG POWER EQUIP
Filing Date
2026-03-30
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

In the existing technology, the calculation of the Nusselt number of the shell-side fluid in the spiral baffle heat exchanger fails to differentiate between laminar and turbulent flow states, resulting in insufficient accuracy of the heat transfer coefficient calculation results.

Method used

By distinguishing the flow state of the shell-side fluid, the corresponding Nusselt number calculation formula is used, and corrections are made by combining the helix angle, leakage and bypass correction coefficients to form a complete correction logic and calculate the heat transfer coefficient of the shell-side fluid.

Benefits of technology

It improves the accuracy of calculating the heat transfer coefficient of the shell-side fluid in spiral baffle heat exchangers, reduces the calculation error caused by differences in flow state, and achieves a good match between the heat transfer coefficient and the actual operating conditions.

✦ Generated by Eureka AI based on patent content.

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Abstract

This invention relates to the field of computational technology for chemical heat exchange equipment, specifically a process calculation method for a spiral baffle heat exchanger. The method includes: inputting structural and operating parameters, verifying and normalizing them to generate a standard design parameter set; calculating the Reynolds number and Prandtl number of the shell-side fluid, distinguishing between laminar and turbulent flow states, and using corresponding formulas to calculate the laminar Nusselt number and the turbulent Nusselt number of the shell-side fluid under laminar flow and turbulent flow conditions, respectively; obtaining three types of correction coefficients: helix angle, leakage, and bypass; correlating the state-specific Nusselt numbers with the correction coefficients to obtain the corrected Nusselt number; and combining the physical property parameters in the standard design parameter set to calculate the shell-side fluid heat transfer coefficient. This invention optimizes the shell-side heat transfer calculation logic of the spiral baffle heat exchanger by calculating the Nusselt number differently according to the flow state and correlating multiple correction coefficients, thereby improving the matching degree between the calculation results and actual operating conditions.
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