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Aluminium alloy heat exchange tube

A heat exchange tube and aluminum alloy technology, which is applied in the field of aluminum alloy heat exchange tubes and shell-and-tube heat exchangers, can solve the problems of poor acid resistance and corrosion resistance of copper tubes, high cost of alloy steel tubes, and easy deformation, and achieves acid resistance and corrosion resistance. The effect of good corrosion resistance, improving yield, improving plasticity and acid resistance and corrosion resistance

Inactive Publication Date: 2006-03-08
陈继忠
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The acid solution of some chemical fertilizer production enterprises needs heat exchange, because the copper pipe has poor acid resistance and corrosion resistance, short service life, and high cost of alloy steel pipe, so most of them use aluminum alloy pipe as the heat exchange tube of the shell-and-tube heat exchanger
However, ordinary aluminum alloy tubes have high hardness and poor plasticity, and are prone to deformation when bending, especially when bending arcs with small radius, they are easy to crack, and the yield is low. More than 50% of the bent aluminum alloy heat exchange coils are scrapped

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0006] Embodiment 1: Al98.4, Si0.2, Mg0.9, Fe0.2 and Cu0.3 are placed in the smelting furnace for smelting in parts by weight, the temperature of the molten aluminum alloy in the smelting furnace is controlled at 700°C, and the surface of the smelting furnace is Add a covering agent, then draw it into an aluminum alloy rod, and finally extrude it into the required aluminum alloy heat exchange tube. The plasticity, acid resistance and anti-corrosion performance of the aluminum alloy heat exchange tube are obviously improved compared with the ordinary aluminum alloy heat exchange tube.

Embodiment 2

[0007] Example 2: Al98.75, Si0.38, Mg0.6, Fe0.25 and Cu0.25 are placed in a smelting furnace for smelting in parts by weight, and the temperature of the molten aluminum alloy in the smelting furnace is controlled at 710°C, and the rest are implemented in the same manner example 1.

Embodiment 3

[0008] Embodiment 3: Al98.17, Si0.3, Mg0.8, Fe0.22 and Cu0.2 are placed in the smelting furnace for smelting in parts by weight, and the temperature of the molten aluminum alloy in the smelting furnace is controlled at 720 ° C, and the rest are implemented in the same manner example 1.

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Abstract

The weight proportion of the raw material in the alloy is: Al 98.17~98.75, Si 0.2~0.38, Mg 0.6~0.9, Fe 0.2~0.25. Cu 0.25~0.3, in which, Cu in it strengthens the hardness and extension power of the Al alloy tubes, Mg increases the plasticity and acid-resistant performance cracks do not appear on the turning arc of the tube by this invention.

Description

Technical field: [0001] The invention relates to a shell and tube heat exchanger. In particular, it relates to an aluminum alloy heat exchange tube used for shell-and-tube heat exchange tubes. The utility model is mainly used in chemical fertilizer production enterprises and belongs to the technical field of heat exchange equipment accessories. Background technique: [0002] Shell and tube heat exchangers are widely used in the fertilizer industry due to their excellent performance. The acid solution of some chemical fertilizer production enterprises needs heat exchange, because the copper pipe has poor acid resistance and corrosion resistance, short service life, and high cost of alloy steel pipe, so most of them use aluminum alloy pipe as the heat exchange tube of the shell-and-tube heat exchanger. However, ordinary aluminum alloy tubes have high hardness and poor plasticity, and are prone to deformation when bending, especially when bending arcs with small radius, they ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/06
Inventor 陈继忠
Owner 陈继忠
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