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Multi-layered heat transfer tube, manufacturing method of multi-layered heat transfer tube, and forming device used in the manufacturing method

a technology of multi-layered heat transfer and manufacturing method, which is applied in indirect heat exchangers, drawing dies, lighting and heating apparatus, etc., can solve the problems of difficult to significantly improve eating-away resistance, and achieve the effect of improving eating-away resistance against seawater

Inactive Publication Date: 2013-03-14
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a multi-layered heat transfer tube (fin tube) for an open rack vaporizer (ORV) that has improved resistance to seawater (heat carrier) and is designed to prevent eating-away. The entire circumference of the base material is coated by a sacrificial anode coating.

Problems solved by technology

However, because the sacrificial anode coating formed by thermal spraying is weakly bonded to the base material, it is difficult to significantly improve the eating-away resistance.

Method used

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  • Multi-layered heat transfer tube, manufacturing method of multi-layered heat transfer tube, and forming device used in the manufacturing method
  • Multi-layered heat transfer tube, manufacturing method of multi-layered heat transfer tube, and forming device used in the manufacturing method
  • Multi-layered heat transfer tube, manufacturing method of multi-layered heat transfer tube, and forming device used in the manufacturing method

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first embodiment

[0019]A multi-layered heat transfer tube according to a first embodiment of the present invention will be described with reference to FIG. 1 and FIG. 2. FIG. 1 is a perspective view schematically showing an open rack vaporizer (ORV) that vaporizes liquefied natural gas (LNG). FIG. 2 (a) and FIG. 2 (b) are diagrams showing the configuration of a multi-layered heat transfer tube in the ORV.

[0020]The ORV 1 shown in FIG. 1 is a kind of heat exchanger, and heats and vaporizes low-temperature LNG by heat exchange using mainly seawater. The ORV1 has a plurality of heat exchange panels 3. Each heat exchange panel 3 has a plurality of multi-layered fin tubes (multi-layered heat transfer tubes) 2 that are arranged in parallel. Each multi-layered fin tube 2 has the same length (for example, 4 to 6), and has a plurality of protruding fins that extend in the longitudinal direction of the multi-layered fin tube 2 and are arranged in the circumferential direction of the multi-layered fin tube 2.

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second embodiment

[0041]A second embodiment of the present invention will be described with reference to FIG. 3 and FIG. 4.

[0042]In this embodiment, a method for manufacturing the multi-layered fin tube 2 described in the first embodiment, and a forming device used in the manufacturing thereof will be described. FIG. 3 is a schematic view showing a method for manufacturing a multi-layered fin tube 2 according to the second embodiment. FIG. 4 (a) to FIG. 4 (c) are diagrams schematically showing a forming device used in the manufacturing of a multi-layered fin tube 2.

[0043]The outline of a manufacturing method of a multi-layered fin tube 2 will be described with reference to FIG. 3.

[0044]First, a cylindrical aluminum material is prepared as an inner tube material as a metal original material for forming the inner tube 4 of a multi-layered fin tube 2. A cylindrical aluminum alloy material that contains several percent (for example, 1 to 5%) zinc is prepared as an outer tube material as a metal original ...

third embodiment

[0058]A modification of the above-described multi-layered fin tube (multi-layered heat transfer tube) 2 according to the first embodiment will be described in detail with reference to FIG. 5 (a) and FIG. 5 (b). FIG. 5 (a) is a sectional view of a multi-layered fin tube 16 according to this modification taken along a plane perpendicular to the axis. FIG. 5 (b) is a perspective view showing the whole multi-layered fin tube 16.

[0059]As with the multi-layered fin tube 2 in the first embodiment, the multi-layered fin tube 16 is a substantially cylindrical hollow tube having a length, for example, of 4 to 6 m, and has a substantially cylindrical inner tube 17 as a base material that forms the main body of the multi-layered fin tube 16, and an outer tube 18 as a coating material that coats the entire outer peripheral surface of the inner tube 17. The inner tube 17 is formed, for example, of metallic aluminum, and the outer tube 18 is formed of aluminum alloy that contains several percent (...

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Abstract

A multi-layered heat transfer tube for use in a carburetor for a liquefied gas, comprising an inner tube which is equipped with a passage through which a liquefied gas can pass and an outer tube which covers the outer peripheral surface of the inner tube, wherein each of the inner tube and the outer tube has multiple fins that extend in the direction of the length of the multi-layered heat transfer tube and are arranged along the direction of the circumference of the multi-layered heat transfer tube, at least the outer tube is composed of a fully dense material, and the outer tube covers the entire outer surface of the inner tube and is bound to the inner tube via a metallic bond.

Description

TECHNICAL FIELD[0001]The present invention relates, for example, to a multi-layered heat transfer tube used in an open rack liquefied natural gas vaporizer, a manufacturing method of a multi-layered heat transfer tube, and a forming device used in the manufacturing method.BACKGROUND ART[0002]For example, fuel such as natural gas used in thermal power stations or the like is liquefied under low temperature and high pressure, and is transported or stored as liquefied natural gas (LNG). Such liquefied natural gas is vaporized into natural gas (NG) before use. LNG boils and vaporizes into NG at about −160° C. Usually, an open rack vaporizer (hereinafter referred to as ORV) is used in the vaporization of LNG.[0003]The ORV is a kind of heat exchanger, and heats and vaporizes low-temperature liquefied natural gas by heat exchange using mainly seawater. The ORV has a plurality of heat exchange panels having a plurality of fin tubes. Each heat exchange panel is formed by arranging in paralle...

Claims

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Application Information

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IPC IPC(8): F28F1/16B21C23/10B21D22/26F28D7/10
CPCB21C3/04F28D2021/0064B21C23/10B21C23/22B29C47/065B29C47/903F28F1/18F28F21/084F28F2255/16B21C23/007B29C47/0023F28F1/426F28F19/06F28D7/0041F28F1/06B21C3/16B29C48/09B29C48/12B29C48/21B29C48/903B29C48/908
Inventor SAKAE, AKIRATOYOTAKE, KOTARO
Owner KOBE STEEL LTD
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