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Method for achieving stable dropwise condensation on heat exchange surface and efficient heat exchanger

A technology of heat exchange surface and drop-like condensation, which is applied to the device for coating liquid on the surface, special surface, coating, etc. It can solve the problems that the strength cannot meet the application requirements, increase the operating cost, and poor durability, etc., and achieve durable dripping Condensation and heat transfer phenomenon, improved performance such as heat resistance and heat conduction, and low cost of surface treatment

Inactive Publication Date: 2020-05-01
江苏中圣压力容器装备制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hydrophobic or superhydrophobic low surface energy surfaces constructed by traditional methods all have the characteristics of poor durability, and the strength of the superhydrophobic micro-nano surface cannot meet the application requirements; some surface treatment methods with better performance such as plasma Spraying, surface precious metal coating, photolithography, etc. are accompanied by a significant increase in operating costs

Method used

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  • Method for achieving stable dropwise condensation on heat exchange surface and efficient heat exchanger
  • Method for achieving stable dropwise condensation on heat exchange surface and efficient heat exchanger
  • Method for achieving stable dropwise condensation on heat exchange surface and efficient heat exchanger

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The carbon steel heat exchange tube (length 650mm, inner diameter 19mm, wall thickness 2mm) is used as the metal substrate, and the metal material and the coating are determined according to the 0-level adhesion standard stipulated in GB / T9286 "Cross-cut test of paint and varnish film". The bonding strength characteristics between the layers, the coating can not reach the 0-level adhesion standard after the scratch test. Build a silicone rubber system coating on the surface of carbon steel heat exchange tubes to achieve stable and long-lasting droplet condensation. The method is as follows:

[0044] Surface pretreatment of carbon steel heat exchange tubes: wash the carbon steel heat exchange tubes in deionized water and dry them; polish the surface of the heat exchange tubes with 600 mesh, 800 mesh, and 1200 mesh sandpaper in sequence; then use deionized water and Clean the heat exchange tubes with 95% ethanol and dry them; the sulfuric acid with a mass fraction of 30% ...

Embodiment 2

[0051] Taking carbon steel heat exchange tubes (same as in Example 1) as an example, the surface pretreatment method is the same as in Example 1.

[0052] Primer treatment: prepare 15% silane coupling agent KH560 absolute ethanol solution, add di-n-octyltin dilaurate as a catalyst (the mass fraction of di-n-octyltin dilaurate is 2%), adjust an appropriate amount of glacial acetic acid to The pH is about 5, and the primer is obtained after fully stirring. Use the compressed air spraying method to spray on the surface of the pretreated carbon steel heat exchange tube, keep the distance between the spray gun and the surface of the material at 10cm, spray one layer evenly at a moving speed of 10cm / s, and dry in an open environment.

[0053] Prepare the coating material: 100 parts by weight of PDMS (PDMS with a molecular weight of about 6000 and PDMS with a molecular weight of about 18000 are compounded according to a weight ratio of 8:2), 15 parts by weight of a gas-phase method o...

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Abstract

The invention discloses a method for achieving stable dropwise condensation on a heat exchange surface. The method comprises the steps that a metal heat exchange surface is pretreated; a basic rubbermaterial is prepared, wherein the basic rubber material comprises the following raw materials of, in parts by weight, 100 parts of hydroxyl-terminated polydimethylsiloxane, 5 - 30 parts of nano silicon dioxide, 10 - 50 parts of a cross-linking agent or a coupling agent, 0.1 - 0.5 part of a catalyst and 2 - 10 parts of a functional additive; the basic rubber material is dispersed in a dispersion medium to prepare a coating material with the hydroxyl-terminated polydimethylsiloxane in mass fraction of 2.5% - 25%; and the coating material is sprayed onto the metal heat exchange surface to form asingle-component room-temperature vulcanized silicone rubber system coating. According to the method for achieving the stable dropwise condensation on the heat exchange surface, the extremely thin silicone rubber system coating is constructed on the metal heat exchange surface, so that stable and durable dropwise condensation is achieved on the heat exchange surface; and a heat exchange surface ofan efficient heat exchanger is treated through the method, the efficient heat exchanger is suitable for the steam condensation heat transfer process containing non-condensable gas, and the condensation and heat transfer efficiency of the process is improved.

Description

technical field [0001] The invention belongs to the field of high-efficiency heat exchanger equipment for steam condensation containing non-condensable gas, and relates to a method for realizing stable and long-lasting dropwise condensation on a heat exchange surface and a heat exchanger prepared by the method. Background technique [0002] Film condensation and drop condensation are two basic forms of steam condensation on solid walls. Studies have proved that drop condensation has the superiority of heat transfer, and its condensation heat transfer coefficient is several times or even dozens of times that of film condensation. Especially in the case of non-condensable gas, the existence of a small amount of non-condensable gas can significantly reduce the condensation heat transfer coefficient on the steam side, and at this time, increasing the heat transfer coefficient on the condensation side can significantly improve the overall heat transfer coefficient. [0003] So fa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D5/00B05D7/14B05D7/24
CPCB05D5/00B05D7/14B05D7/24B05D2518/12B05D2601/20B05D2601/22B05D2601/24B05D2602/00
Inventor 郭宏新江郡刘丰刘洋张贤福
Owner 江苏中圣压力容器装备制造有限公司
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