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Heat exchange tube of efficient liquid nitrogen heat exchanger and heat exchanger

A technology of heat exchange tubes and heat exchangers, which can be used in heat transfer modification, heat exchange equipment, lighting and heating equipment, etc., and can solve the problems of low boiling heat exchange efficiency of heat exchange tubes.

Pending Publication Date: 2020-10-23
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide a heat exchange tube for a high-efficiency liquid nitrogen heat exchanger, its manufacturing method and the Heat exchanger with heat exchange tubes to further increase heat exchange capacity

Method used

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  • Heat exchange tube of efficient liquid nitrogen heat exchanger and heat exchanger
  • Heat exchange tube of efficient liquid nitrogen heat exchanger and heat exchanger
  • Heat exchange tube of efficient liquid nitrogen heat exchanger and heat exchanger

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Embodiment Construction

[0038] The present invention will be described in detail below with reference to the drawings and specific embodiments.

[0039] Such as figure 1 As shown, the shell and tube heat exchanger provided by the present invention includes: a shell 1, a tube box flange 2, a connecting flange 3, a heat exchange tube 4, a baffle 5, a convex head 6, and a head tube box 7. Movable saddle parts 8. Air vent / drain 9 and split-range partition plate 10, with liquid nitrogen through the tube side and cooling medium through the shell side. Among them, the inner surface of the heat exchange tube 4 has a thin thermal resistance layer, and the outer surface has a hydrophobic anodic oxide film, such as figure 2 Shown.

[0040] The characteristic of the hydrophobic surface of the heat exchange tube in this embodiment is that the droplets are difficult to spread on the surface, but form bead-like condensation and quickly fall off, and it is not easy to form a thick frost layer; the characteristic of the ...

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Abstract

The invention relates to a heat exchange tube of an efficient liquid nitrogen heat exchanger and the heat exchanger. A hydrophobic layer is arranged on the outer surface of a heat exchange tube body,and a thin thermal resistance layer is arranged on the inner surface of the heat exchange tube body. The inner and outer surfaces of the heat exchange tube are specially machined, the heat exchange tube with the hydrophobic outer surface and the thin thermal resistance layer as the inner surface is provided, the hydrophobic outer surface can effectively slow down surface frosting, and the thin thermal resistance layer on the inner surface can significantly improve the internal boiling heat transfer efficiency. The heat exchange tube has the following advantages and effects: the heat exchange effect is good, rapid cooling can be realized, the use efficiency of liquid nitrogen is high, and a large amount of cold energy of cold nitrogen after the liquid nitrogen is vaporized can also be recycled.

Description

Technical field [0001] The invention relates to the technical field of heat exchangers, in particular to a heat exchange tube and a heat exchanger of a high-efficiency liquid nitrogen heat exchanger. Background technique [0002] In engineering applications, cryogenic gases and cryogenic liquids are more and more widely used. In high-temperature areas or seasons, the density of air decreases, which has many adverse effects on the operating performance of the gas turbine. Therefore, it is often necessary to cool the intake air of the unit. In addition, the air contains a small amount of low boiling point solvents, such as methanol, etc., which need to be recovered by condensation during recovery. The common cooling unit can achieve a small cooling interval and a long start-up time. The unit is also relatively large, and it is difficult to achieve rapid pre-cooling and lower temperature cooling. [0003] As the preparation technology of liquid nitrogen becomes more and more mature,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F28F13/00F28F13/04F28F13/18F28F21/08B24B1/00C25D11/34C25F3/24
CPCB24B1/00C25D11/34C25F3/24F28F13/00F28F13/04F28F13/18F28F21/083
Inventor 徐维泰张鹏程诚
Owner SHANGHAI JIAO TONG UNIV
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