Inner fin externally sintered porouslayer heat exchange tube

A technology of heat exchange tubes and porous layers, applied in the field of heat exchange tubes, can solve problems such as low production efficiency and poor bonding of porous layers, and achieve the effects of wide application, improved bonding strength and production efficiency, and high heat transfer coefficient

Inactive Publication Date: 2010-06-16
SHANGHAI RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can sinter a uniform porous surface of various materials, it has disadvantages such as poor bonding of the porous layer and low production efficiency, and it can only strengthen heat transfer on one side.

Method used

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  • Inner fin externally sintered porouslayer heat exchange tube
  • Inner fin externally sintered porouslayer heat exchange tube
  • Inner fin externally sintered porouslayer heat exchange tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] like figure 1 , 2 As shown, the inner fin outer sintered porous layer heat exchange tube, the heat exchange tube is processed by smooth carbon steel pipe 1, the specification of the carbon steel pipe is φ15×2×50mm, the processing method includes the following steps: smooth the metal The inner surface of the tube is machined into a spiral low-fin surface, and then the outer surface is sprayed with paint slurry, which is a mixture of metal brass powder and binder with a weight ratio of 10:2. The binder is polypropylene and acetone, and it is dried in the air. After drying, enter the high-temperature sintering furnace for sintering. The sintering temperature is 800°C. After cooling, it is released from the furnace to obtain a double-sided enhanced heat exchange tube with a regular spiral low-fin surface 3 on the inner surface and a metal porous surface layer 2 on the outer surface.

[0031] The bottom wall of the spiral low-finned surface is provided with 30 regular spira...

Embodiment 2

[0034] Inner fin outer sintered porous layer heat exchange tube processed on the basis of titanium tube with a specification of φ19×2×1500mm. The preparation method of the inner fin outer sintered porous layer heat exchange tube is to machine the inner surface of the metal smooth tube into Spiral low-fin surface, the specifications of the spiral low-fin surface layer are the number of helical teeth n=60, the helix angle φ=45°, the low wall thickness w=1.5mm, and the helix height e=0.5mm, and then spray the paint slurry on the outer surface, The slurry is a mixture of white copper powder and binder with a weight ratio of 10:5. The binder is polystyrene and xylene. After drying, it enters a high-temperature sintering furnace for sintering. Get the product right out of the oven. The metal porous surface layer has a thickness of 0.25 mm, an equivalent pore size of 40 μm, and a porosity of 65%. In a boiling heat transfer experiment using acetone as a medium, the boiling heat transf...

Embodiment 3

[0036] On the basis of copper light tube 1 with a specification of φ25×2.5×6000mm, the heat exchange tube with inner fins and outer sintered porous layer is processed. The two ends of the heat exchange tube are smooth circular section pipe joints, and the middle of the heat exchange tube is processed into A double-sided enhanced heat exchange section, the inner surface of the double-sided enhanced heat exchange section is a spiral low-fin surface layer 3 , and the outer surface is a metal porous surface layer 2 .

[0037] The preparation method of the heat exchange tube with a sintered porous layer outside the inner fin: machining the inner surface of the metal smooth tube into a spiral low-fin surface, the specification of the spiral low-fin surface layer 3 is that the number of spiral teeth is n=70, and the spiral angle φ=28 °, low wall thickness w=1.0mm, spiral height e=1.5mm, then spray paint slurry on the outer surface, the slurry is a mixture of metal copper powder and bi...

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Abstract

The invention relates to an inner fin externally sintered porouslayer heat exchange tube which comprises tube fitting segments with smooth circular sections at both ends, and a double strengthened heat exchange segment in the middle, wherein the internal surface of the double strengthened heat exchange segment is a spiral low fin surface, and the external surface is a metallic porous surface. Compared with the prior art, the inner fin externally sintered porouslayer heat exchange tube can simultaneously strengthen condensing heat exchange in the tube and boiling heat exchange outside the tube. In the tube, the condensing coefficient of heat exchange can be doubled by increasing heat exchange area, disturbing fluid flowing states, reducing temperature boundary layers, etc.; the boiling heat exchange efficiency can be improved by an order of magnitude with the method of increasing the nucleus of boiling outside the tube. The strengthening effects inside and outside the tube are obvious. The heat exchange tube belongs to a double-surface strengthened heat exchange tube. The inner fin externally sintered porouslayer heat exchange tube has the characteristics of good strengthened heat exchange effect, low flowing resistance, high production efficiency, low cost, etc.

Description

technical field [0001] The invention relates to a heat exchange tube, in particular to a double-sided enhanced heat exchange tube, a core component of a high-efficiency heat exchanger used in heat exchange equipment such as petroleum, chemical industry, low-temperature refrigeration, air separation, seawater desalination, and aerospace. The improvement of the smooth heat exchange tube belongs to the heat exchange element technology. Background technique [0002] Double-sided enhanced heat exchange tubes and their high-efficiency heat exchangers can be used in various heat exchange processes with phase changes, namely vaporizers, evaporators, reboilers, condensers, etc., such as ethylene vaporizers, ethylene separation devices, and overhead condensation Evaporator and reboiler, ethylene glycol evaporation, aromatics combined unit, main condenser-evaporator of air separation unit, natural gas liquefaction, refrigeration, air conditioning, seawater desalination unit, etc. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F28F1/40F28F13/18B22F7/00
Inventor 刘阿龙彭东辉韩坤
Owner SHANGHAI RES INST OF CHEM IND
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