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Integral inclined pin-fin tube

A technology of slanted needles and finned tubes, applied in the field of heat exchange elements, can solve the problems of not being able to promote the discharge of condensate, and achieve the effect of avoiding corrosion problems and eliminating stagnation zones

Inactive Publication Date: 2013-05-08
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the pin-fin tubes are arranged vertically, the role of the pin-fin is limited to providing more heat transfer area and disturbing the boundary layer, but it cannot promote the discharge of condensate from the base tube

Method used

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  • Integral inclined pin-fin tube
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Embodiment Construction

[0023] The present invention will be described in more detail below with examples in conjunction with the accompanying drawings.

[0024] to combine figure 1 and figure 2 , the overall oblique pin-fin tube is composed of the base tube 2 and the pin-fin 1, and the axial angle θ between the pin-fin 1 and the base tube 2 is less than 90°.

[0025] The integral slanted pin-fin tube is based on a smooth round tube, and the pin-fin 1 is directly processed on the outer surface of the smooth tube by using a continuous cutting method. The pin fins 1 are arranged on the outer surface of the base tube 2 with a certain pitch p. According to the needs of the service conditions, the needle fin 1 can be designed and processed into different heights H, different pitches p, different root thicknesses t and different angles θ.

[0026] When the steam contains a lot of air, the basic parameters of the slanted pin-fin tube are: the outer diameter of the base tube is 25-50mm, the wall thicknes...

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Abstract

The invention provides an integral inclined pin-fin tube which comprises a base tube and pin-fins, wherein the pin-fins are inclined pin-fins formed by directly cutting on the surface of the base tube, and the included angle of the inclined pin-fins and a base tube shaft is smaller than 90 degrees. The integral inclined pin-fins are suitable for strengthening the heat transmission process of steam-air mixed gas under a vertically arranged condition. When the capacity of steam in the mixed gas is high, steam condensate liquid on the surface of the base tube of the integral inclined pin-fin tube can be exhausted along the inclined pin-fins, and therefore the thickness of a liquid film on the base tube is reduced to enhance condensation heat transmission. Furthermore, under the dual-influence of gravity and surface tension, a thick liquid film can hardly be formed on the surfaces of the inclined pin-fins by the steam, and therefore condensation heat transmission ability of a secondary heat transmission surface is enhanced. When the capacity of the steam in the mixed gas is low, as a heat transmission tube, the inclined pin-fins are helpful for improving heat transmission coefficients, and the inclined fin-pins can be discontinuously distributed on the base tube to eliminate stagnation regions of flowing of the mixed gas.

Description

technical field [0001] The invention relates to a heat exchange element, specifically a pin-fin tube. Background technique [0002] For pressurized water reactor nuclear power plants, the prestressed concrete containment is the last barrier to prevent the leakage of radioactive materials. However, under certain severe accident conditions, a large amount of coolant (such as water) is sprayed from the pressure pipeline and turns into water vapor and is discharged into the containment vessel. With the entry of water vapor, the single air in the containment is transformed into a steam-air mixture; moreover, for the closed space of the containment, the entry of a large amount of water vapor will cause the temperature and pressure of the gas in the containment to increase . If the temperature and pressure of the steam-air mixture in the containment cannot be effectively controlled, the integrity of the containment may be destroyed and cause the release of radioactive substances....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F28F1/34
Inventor 丁铭孙中宁范广铭曹夏昕谷海峰阎昌琪孙立成王建军
Owner HARBIN ENG UNIV
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