Heat exchange tube with two reinforced surfaces

A heat exchange tube, double-sided technology, applied in the field of heat exchange tubes, can solve the problems of limited application and low heat transfer coefficient, achieve enhanced boiling heat transfer and condensation heat transfer, high total heat transfer coefficient, and enhanced boiling heat transfer Effect

Active Publication Date: 2012-09-05
SHANGHAI RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the heat transfer coefficient of traditional horizontal heat exchangers is low, which limits the application of this product in many fields. There is an urgent need for a high-efficiency heat exchange product with enhanced boiling and enhanced condensation suitable for horizontal heat exchangers to improve Improve the heat transfer efficiency of the heat exchanger, reduce the operating energy consumption and equipment investment of the existing heat exchanger
At present, there is no such double-sided enhanced heat exchange tube technology in China, so it is very necessary to research and develop such products

Method used

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  • Heat exchange tube with two reinforced surfaces
  • Heat exchange tube with two reinforced surfaces
  • Heat exchange tube with two reinforced surfaces

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Such as Figure 1-3 As shown, on the basis of the copper light tube with a specification of φ32×3×1000mm, the surface specifications of the zigzag fin surface outside the tube are tooth height e=0.8mm, number of teeth n=50, tooth bottom thickness w=2.3mm, groove Depth h=1.2mm, slot width δ f =3mm, helix angle φ=45°. Tooth item radius R 1 =0.5mm, tooth bottom radius R 2 =0.8mm, the outer surface of the low fin is processed by precision machine tools on the outer surface of the smooth tube. The surface of the fin is rough and uneven. The angle makes the saw teeth stagger each other, which plays a role in disturbing the fluid flow state and promoting heat exchange. At the same time, the surface tension makes the liquid film on the fins thinner and flows to the lower edge of the heat exchange tube. Here, under the influence of gravity and capillary action, the heat exchange tube will form multiple liquid droplets with the tooth tip at the lower edge as the core. In the...

Embodiment 2

[0033] The specifications of the outer zigzag fins processed on the basis of brass tubes with specifications of φ22×2×1500mm are tooth height e=0.9mm, number of teeth n=40, tooth bottom thickness w=1.2mm, groove depth h=1.0mm , slot width δ f =2mm, helix angle φ=65°. In the condensation heat transfer experiment using refrigerant as the medium, the condensation heat transfer coefficient can be increased by 5 times. The specifications of the sintered-in-tube porous layer heat exchange tube are: the thickness of the porous layer is 0.25 mm, the equivalent pore diameter is 100 μm, and the porosity is 85%. In the boiling heat transfer experiment with acetone as the medium, the boiling heat transfer coefficient can reach 13 of that of a smooth tube times. The total heat transfer coefficient of the heat exchange tube can be increased by 3.5 times.

Embodiment 3

[0035] A double-sided enhanced heat exchange tube, the heat exchange tube includes a zigzag low-fin outer surface layer and a metal porous inner surface layer, and the low-fin outer surface layer is integrated with the tube wall.

[0036] The low-fin outer surface layer is processed by turning the outer surface of the carbon steel smooth pipe. The specification of the carbon steel smooth pipe is φ40×4×12000mm, and the specification of the low-fin outer surface layer is: fin The outer diameter of the chip is 40mm, the tooth height e=3mm, the number of teeth n=60, the tooth bottom thickness w=1.0mm, the groove depth h=2.5mm, and the groove width δ f =4mm, helix angle φ=35°; the thickness of the porous metal surface layer is 1mm, the porosity is 80%, and the aperture is 120 μm. The porous metal surface layer is added in metal iron powder, accounting for Iron powder weight 0.5% activator diammonium hydrogen phosphate, then add polystyrene binder and mix into mixed slurry, wherein ...

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Abstract

The invention relates to a heat exchange tube with two reinforced surfaces. The heat exchange tube comprises a sawteeth-shaped low-fin outer surface layer and an inner surface metal porous layer, wherein the low-fin outer surface layer is integrated with the tube wall. Compared with the prior art, the heat exchange tube strengthens the condensation of steam at the outside of the tube and the evaporation of liquid in the tube simultaneously; the surfaces of sawteeth-shaped fins of the outside of the tube are rough, and the sawteeth are mutually staggered, thus disturbing the flowing state of fluid; the surface tension is utilized to thin a liquid film on the fins so as to strengthen the condensation and heat transfer; and the number of vaporized cores is added on the porous layer at the inner surface of the tube, thus reducing the superheat degree needed by vaporization, strengthening the heat transfer of boiling, and improving the heat transfer of boiling by 10-15 times.

Description

technical field [0001] The invention relates to a heat exchange tube, in particular to a double-sided enhanced heat exchange tube, which is an improvement to the existing enhanced heat exchange tube and belongs to the enhanced heat exchange element technology. Background technique [0002] Heat exchanger is an indispensable equipment to realize heat exchange and transfer in chemical production process. In petroleum, chemical, light industry, pharmaceutical, energy and other industrial production, it is often necessary to heat low-temperature fluid or cool high-temperature fluid, vaporize liquid into steam or condense steam into liquid. These processes are closely related to heat transfer, so they can be completed by heat exchangers. [0003] The heating residence time in the horizontal heat exchanger is short, easy to maintain and clean, and suitable for large areas. However, the heat transfer coefficient of traditional horizontal heat exchangers is low, which limits the a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F28F1/12F28F13/18
Inventor 刘阿龙彭东辉韩坤
Owner SHANGHAI RES INST OF CHEM IND
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