Porous hydrophilic stainless steel heat exchange tube and surface treatment method thereof

A technology of surface treatment and heat exchange tubes, applied in heat transfer modification, heat exchange equipment, lighting and heating equipment, etc., can solve the problem of increasing the resistance of condensate film formation, reducing heat exchange efficiency, and reducing the service life of heat exchange tubes, etc. problems, to achieve the effects of improving overall stability and service life, enhancing evaporation and boiling heat transfer, and accelerating water film spreading

Active Publication Date: 2014-10-29
FULL DIMENSION POWER TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main problems in the machining method include: (1) The ductility, elastic modulus, hardness, etc. of the pipes make it impossible for ferritic stainless steel, duplex steel, martensitic stainless steel pipes and other pipes to achieve surface porosity through machining; ( 2) Structures such as internal and external teeth and internal and external threads have higher requirements for wall thickness, which increases the weight of the pipe; (3) The fin shape and gap are easy to form refrigerant stagna...

Method used

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  • Porous hydrophilic stainless steel heat exchange tube and surface treatment method thereof
  • Porous hydrophilic stainless steel heat exchange tube and surface treatment method thereof
  • Porous hydrophilic stainless steel heat exchange tube and surface treatment method thereof

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Embodiment 1

[0028] The liquid-phase plasma electrolysis on the surface of SUS445J2 stainless steel tube is under the condition of constant temperature of 45-50 ℃, and the output voltage and current are controlled by intelligent pulse power supply. The voltage is 280V, the duty cycle is 55%, the current is 15A, and the electrolyte is 15wt. %Na 2 SO 4 -10wt.%Na 3 BO 3 system, after 10 minutes of treatment, wash and dry with water to achieve surface roughening, and its surface morphology is as follows figure 1 shown;

Embodiment 2

[0030] The laser power of the laser polishing on the surface of SUS304 stainless steel tube is 3.5KW, the diameter of the laser beam is 2.5mm, the scanning speed is 30cm / s, and the feeding speed is 1.5m / min, so as to realize the roughening of the surface. The surface appearance after treatment is as follows: figure 2 shown;

Embodiment 3

[0032] The surface of SUS316 stainless steel pipe is sand blasted with brown corundum with an average particle size of 46 mesh, the sand blasting pressure is 0.8Mpa, the distance between the nozzle and the surface is 18cm, double-head longitudinal sand blasting is adopted, and the steel pipe travel speed is 3m / min to achieve surface roughening , the surface morphology after treatment is as image 3 shown;

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Abstract

The invention discloses a surface treatment method for a porous hydrophilic stainless steel heat exchange tube. The method includes the following steps that liquid phase plasma electrolysis or laser polishing or sand blasting treatment is carried out on a stainless steel tube to achieve surface roughening; chemical electrolysis or sol modified electroplating treatment is conducted on the roughened steel tube surface; a stainless steel heat exchange tube and a heat exchanger with the stainless steel heat exchange tube are obtained through the steps. According to the method, porous and recess microstructures can be obtained from surfaces of various stainless steel tubes, and reinforcement evaporation and boiling heat transfer are greatly improved; continuous strong hydrophilic performance can be obtained from the surfaces of various stainless steel tubes, water film spreading is accelerated, the thickness of a water film can be reduced, and therefore heat exchange efficiency is improved; metal surfaces more resistant to pitting corrosion, chloridion stress corrosion and concentration difference micro cell corrosion can be obtained from the surfaces of various stainless steel tubes, overall stability of a heat exchanger unit is improved, and the service life of the heat exchanger unit is prolonged.

Description

technical field [0001] The invention relates to the technical field of heat transfer equipment, in particular to a porous hydrophilic stainless steel heat exchange tube for enhancing evaporation heat transfer outside the tube and a surface treatment method thereof. Background technique [0002] At present, falling film heat exchangers are widely used in the evaporators and absorbers of absorption refrigerators and heat pumps. Their shells operate under vacuum conditions, and the refrigerant is sprayed to the horizontally arranged heat transfer tubes in a certain way. Above, the refrigerant inside the tube is cooled or heated, and the refrigerant outside the tube and the refrigerant inside the tube are used for heat exchange. In order to improve the heat exchange efficiency, strengthen the evaporation outside the tube and reduce the volume of the heat exchange equipment, it can be achieved by changing the shape or surface morphology of the heat exchange tube. The former uses...

Claims

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Application Information

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IPC IPC(8): B23P15/26F28F13/18F28F19/00
CPCB23P15/26B23P2700/09F28F13/18F28F19/00
Inventor 任超孙颖锋刘嵩权成
Owner FULL DIMENSION POWER TECH
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