Manufacturing method of heat exchange pipe for highly corrosive medium
A manufacturing method and technology for heat exchange tubes are applied in the field of manufacturing heat exchange tubes, and can solve the problems of not considering corrosion resistance and high thermal conductivity, polluting the plating solution, affecting the quality of the coating, etc.
Active Publication Date: 2012-12-26
BAOSHAN IRON & STEEL CO LTD +1
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Problems solved by technology
[0003] The existing metal heat exchange tubes cannot meet the above requirements, and in the process of heating the plating solution, the metal heat exchange tubes will generate impurity ions to pollute the plating solution, thereby affecting the quality of the coating
[0004] The publication number is CN2491803, and the publication date is May 15, 2002. The Chinese patent document titled "Fluoroplastic Tube Bundle Heat Exchanger" discloses a heat exchange device, which is mainly suitable for various types of heat exchangers in the petroleum and chemical industries. Heat exchanger or reactor with stirring device, so it does not take into account the requirements of corrosion resistance and high heat conductivity
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[0016] Adopt following steps to make heat exchange tube, this heat exchange tube is used for strongly corrosive medium, and the specific parameters in each embodiment are shown in Table 1:
[0017] (1) Making graphite powder: Grind graphite into graphite powder with a particle diameter of 1-10um, and use silane surface coupling agent for surface treatment. The treatment method is to put graphite powder and silane coupling agent into a high-speed mixer and stir for 5-30 minute;
[0018] (2) Rubber mixing: Stir and mix the surface-treated graphite powder and PFA in a high-speed mixer in proportion, the ratio of graphite powder and PFA is controlled between 5% and 30%, and the material is discharged after mixing for 5-30 minutes;
[0019] (3) Granulation: the mixture is granulated in a screw extruder, the temperature of granulation is controlled at 350±30°C, and the size of the particles is 1-5mm;
[0020] (4) Blowpipe: Extrude the granulated granules into a pipe on a plastic ex...
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Abstract
The invention discloses a manufacturing method of a heat exchange pipe for a highly corrosive medium, which comprises the steps of making graphite powder, mixing glue, granulating and blowing the pipe. In the graphite powder making step, graphite is ground into the graphite powder with the particulate diameter of 1-10 micrometers, then the graphite powder is mixed with coupling agents, and the surface treatment is performed on the graphite powder. In the glue mixing step, the graphite powder subjected to the surface treatment is blended with meltable PFA (polytetrafluoroethylene) and then discharged, and the blending ratio of the graphite powder to the meltable PFA is 5-30 wt%. In the granulating step, the mixture is granulated at 320-380 DEG C, and particulates are 1-5mm in size. In the pipe blowing step, the pipe is blown at 320-380 DEG C, and the thickness of the heat exchange pipe is 0.06-0.1 times the diameter of the heat exchange pipe. The heat exchange pipe manufactured by the method is high in heat exchange efficiency and good in resistance to pressure and corrosion, and the surface of the heat exchange pipe is free from sticking and scaling.
Description
technical field [0001] The invention relates to a method for manufacturing a heat exchange tube, in particular to a method for manufacturing a heat exchange tube for strong corrosive media. Background technique [0002] Coated packaging materials (chrome-plated-tin plate) are high-end products of cold-rolled sheets, which are produced by continuous electroplating units. The continuous electroplating unit has the characteristics of fast strip steel running speed and high coating quality requirements, which puts forward high requirements for the electroplating process, among which the temperature of the plating solution is an important indicator. The temperature of the plating solution is controlled by the heat exchange equipment of the plating solution, which makes the plating solution heat up rapidly when the plating solution needs to be heated, and rapidly cools the plating solution when the plating solution needs to be cooled. In addition, since the plating solutions of d...
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IPC IPC(8): B29C49/04B29C49/42
Inventor 龚辉潘红良王文朱国和
Owner BAOSHAN IRON & STEEL CO LTD