High-precision low-temperature liquid nitrogen heat exchanger

By using aluminum fin heat exchange tube bundles and U-shaped heat exchange tube groups in low-temperature liquid nitrogen heat exchangers, combined with the latent heat and temperature monitoring interlocking control of nitrogen gasification, the problem of difficult to achieve high-precision temperature control in the existing technology is solved, and the precise control of the temperature after the material is cooled is achieved.

CN119687699APending Publication Date: 2025-03-25张连芳 +1
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Patent Information

Application Number
CN202510027484.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-01-08
Publication Date
2025-03-25

AI Technical Summary

Technical Problem

Existing low-temperature liquid nitrogen heat exchangers are difficult to achieve high-precision temperature control, especially under the strict temperature requirements of the food and pharmaceutical industry.

Method used

The aluminum fin heat exchange tube bundle is used as the chamber for liquid nitrogen gasification, combined with the U-shaped heat exchange tube group, the latent heat of nitrogen gasification is used to pre-cool the material, and the temperature monitoring and flow interlocking control are achieved to achieve accurate control of the temperature after the material is cooled.

Benefits of technology

It realizes precise control of the temperature after the material is cooled, meets the strict requirements of the food and pharmaceutical industry for the temperature range, and improves heat exchange efficiency and accuracy.

✦ Generated by Eureka AI based on patent content.
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Abstract

According to the high-precision low-temperature liquid nitrogen heat exchanger, an aluminum fin heat exchange tube bundle is used as a liquid nitrogen gasification cavity, the heat exchange area is large, and the heat exchange coefficient is high. The main heat exchange pipe is a U-shaped heat exchange pipe set, distribution of refrigerant media in the pipe is facilitated, gasified nitrogen is adopted for heat exchange with materials, temperature monitoring is added to all parts, interlocking control is carried out on the nitrogen inlet flow, the material flow and the temperature, and therefore accurate control over the temperature after the materials are cooled is achieved. Meanwhile, the annular baffle plates are arranged in the inner cavity in the tube shell, gas turbulence is enhanced, and therefore the heat exchange effect is improved; moreover, one end of the aluminum fin heat exchange tube bundle is in expanded connection with the splitter plate, and the other end of the aluminum fin heat exchange tube bundle is a free end and is not fixed by welding, so that the tube freely stretches out and draws back without generating stress, and the aluminum fin heat exchange tube bundle has the advantages of large flux, fast heat exchange, small stress, flexible layout, difficulty in blockage and the like.
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