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Technique for manufacturing hot dip aluminizing heat exchanger

A manufacturing process, hot-dip aluminum plating technology, applied in the direction of heat exchange equipment, etc., can solve the problems of easy local corrosion at the melting line, difficult production process, uneven heating and heat dissipation, etc., to improve the success rate of dipping, eliminate Localized corrosion and immersion plating have a high success rate

Inactive Publication Date: 2006-09-20
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Heat exchangers are widely used in equipment for fluid heating and cooling in petroleum, smelting, chemical, power, heating, food, medicine, metallurgy and refrigeration industries, especially shell-and-tube heat exchangers, which are usually used at high temperatures , high pressure, high flow rate and strong corrosive medium operating environment, so the corrosion phenomenon is very serious, far higher than the corrosion damage of other equipment, in order to improve the anti-corrosion performance of the heat exchanger and prolong its service life, generally use more Corrosion-resistant and erosion-resistant alloy materials, the disadvantage is that the price is relatively expensive. In recent years, due to the development of steel hot-dip aluminizing technology in China, there is a kind of surface that uses hot-dip aluminized steel to make shell-and-tube series heat exchangers. Protection method, there are two current manufacturing processes, which are mainly reflected in the treatment of the core working part of the heat exchanger tube bundle. One is to coat the heat exchange tubes, partitions and tube sheets of the main parts of the heat exchanger with aluminum, and then intersperse them. Assembled into a tube bundle, the advantage of this manufacturing process is that it is simple and easy to operate. The disadvantage is that a fusion line is formed at the interface between the stainless steel weld that connects the workpiece and the aluminum-plated surface of the workpiece, and local corrosion is easy to occur at the fusion line; the second The process is to first assemble the carbon steel heat exchanger components into a heat exchanger tube bundle, and then hot-dip the whole heat exchanger tube bundle with aluminum. The advantage of the heat exchanger tube bundle made by this process is that the overall corrosion resistance is good, and the disadvantage is that The production process is difficult. No matter in the dipping or cooling process, the dense heat exchange tubes are heated and dissipated unevenly inside and outside, which is easy to produce deformation, which not only reduces the yield rate but also affects the product quality; in addition, the cost is high. , the overall immersion plating of the heat exchanger tube bundles not only requires a large immersion plating pot and heating equipment, but also needs to put the heat exchange tube bundles into the molten salt pot for overall preheating and auxiliary heating in order to solve the problem of solidification of the molten aluminum in urgent cooling. Plating treatment, that is, the two-bath method is usually used in the immersion plating process. For this reason, two sets of equipment required for molten salt and molten aluminum need to be solved, which doubles the equipment cost, especially when it cannot reach mass production. The aluminum coating furnace and the molten salt furnace must also be heated continuously, resulting in increased costs. The shortcomings of the above two hot-dip aluminum-coated heat exchangers have affected the production and promotion of hot-dip aluminum-coated heat exchangers.

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  • Technique for manufacturing hot dip aluminizing heat exchanger
  • Technique for manufacturing hot dip aluminizing heat exchanger

Examples

Experimental program
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Effect test

Embodiment 1

[0015] Such as Figure 1-2 As shown, the shell-and-tube heat exchanger includes a head 1, a partition 2, a tube sheet 3, a baffle 4, a heat exchange tube 5, an outer shell 6, a welding part 7, a partial dipping part 8, molten salt 9 and aluminum Liquid 10.

[0016] The first step is to first dip-coat the heat exchange tubes, baffles and other parts of the heat exchanger. Other parts will be dip-coated according to the use requirements, and the tube plate will not be plated with aluminum for the time being;

[0017] The second step is to assemble the tube bundle, insert the dipped heat exchange tube into the baffle plate, insert the end of the heat exchange tube into the fixed tube plate, and weld the tube plate with ordinary carbon steel welding rod. The joints are polished to remove the aluminum layer, so as to facilitate the welding connection with the non-aluminized tube sheet;

[0018] The third step is to plate aluminum on both ends of the assembled heat exchange tube b...

Embodiment 2

[0020] Such as Figure 1-2 As shown, the shell-and-tube heat exchanger includes a head 1, a partition 2, a tube sheet 3, a baffle 4, a heat exchange tube 5, an outer shell 6, a welding part 7, a partial dipping part 8, molten salt 9 and aluminum Liquid 10.

[0021] The first step is to first dip-coat the heat exchange tubes, baffles and other parts of the heat exchanger. Other parts will be dip-coated according to the use requirements, and the tube plate will not be plated with aluminum for the time being;

[0022] The second step is to assemble the tube bundle, insert the dipped heat exchange tube into the baffle plate, insert the end of the heat exchange tube into the fixed tube plate, and weld the tube plate with ordinary carbon steel welding rod. The joints are polished to remove the aluminum layer, so as to facilitate the welding connection with the non-aluminized tube sheet;

[0023] The third step is to plate aluminum on both ends of the assembled heat exchange tube b...

Embodiment 3

[0025] Such as Figure 1-2 As shown, the shell-and-tube heat exchanger includes a head 1, a partition 2, a tube sheet 3, a baffle 4, a heat exchange tube 5, an outer shell 6, a welding part 7, a partial dipping part 8, molten salt 9 and aluminum Liquid 10.

[0026] The first step is to first dip-coat the heat exchange tubes, baffles, tube sheets and other components of the heat exchanger. Other parts are determined according to the use requirements.

[0027] The second step is to assemble the tube bundle, insert the dipped heat exchange tube into the baffle plate, insert the end of the heat exchange tube into the fixed tube plate, and weld the tube plate with ordinary carbon steel welding rod. Grind the welded part with the tube sheet to remove the aluminum coating to facilitate welding connection;

[0028] The third step is to coat the two ends of the assembled heat exchange tube bundle with aluminum, that is, to coat the welded part of the tube plate and the end of the hea...

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Abstract

A technology for manufacturing the heat exchanger with hot-dip-coated aluminium layer includes dip-coating aluminium on the surface of each tube, assembling, and dip-coating both ends of tube cluster, that is, all the welded seams.

Description

technical field [0001] The invention relates to the technical field of heat exchangers, in particular to a manufacturing process of shell-and-tube series hot-dip aluminized heat exchangers. Background technique [0002] Heat exchangers are widely used in equipment for fluid heating and cooling in petroleum, smelting, chemical, power, heating, food, medicine, metallurgy and refrigeration industries, especially shell-and-tube heat exchangers, which are usually used at high temperatures , high pressure, high flow rate and strong corrosive medium operating environment, so the corrosion phenomenon is very serious, far higher than the corrosion damage of other equipment, in order to improve the anti-corrosion performance of the heat exchanger and prolong its service life, generally use more Corrosion-resistant and erosion-resistant alloy materials, the disadvantage is that the price is relatively expensive. In recent years, due to the development of steel hot-dip aluminizing techn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D53/06
Inventor 牟有为
Owner 牟有为