Unlock instant, AI-driven research and patent intelligence for your innovation.

High-efficiency anti-dirt nano coating heat transmission surface, its production method and pool boiling apparatus

A technology of heat transfer surface and nano-coating, which is applied in the direction of coating, heat transfer modification, heat exchange equipment, etc. It can solve the problems of coating firmness, substrate shape and scale, and preparation cost limitations, so as to achieve no fouling The effect of prolonged running time, low adhesion and high heat transfer coefficient

Inactive Publication Date: 2009-06-24
TIANJIN UNIV
View PDF12 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, further improvements are needed to prolong the time of dirt-free operation. At the same time, these preparation methods are still limited in terms of coating firmness, substrate shape and scale, and preparation costs. It is necessary to try new nano-coating preparation methods.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • High-efficiency anti-dirt nano coating heat transmission surface, its production method and pool boiling apparatus
  • High-efficiency anti-dirt nano coating heat transmission surface, its production method and pool boiling apparatus

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0025] The preparation method of nano-coating heat transfer surface of the present invention, it comprises the following steps: (1) metal base is carried out pretreatment; Described pretreatment step comprises polishing, polishing and decontamination step successively; Described polishing Steps are taken 300-800 # Carry out at least 2 times of polishing on the metal base with emery, until no unevenness can be seen with the naked eye; then polish the metal base, and use a diamond abrasive paste with a diameter of 0.5-3 μm for at least 2 times. Mechanical polishing until the average roughness of the substrate surface is 4-60nm, and finally remove the stains left on the metal substrate after polishing, the decontamination step is that the substrate is immersed in a 5-30% sodium hydroxide solution by mass percentage, Keep it for 5-30 minutes to remove part of the grease, then put the taken out substrate into an acetone solution with a mass percentage of 99.5-99.999% for ultrasonic...

Embodiment 1

[0030] Carry out pretreatment to metal substrate copper earlier; Described pretreatment step comprises polishing, polishing and decontamination step successively; Described polishing step is to adopt 600 # Carry out 2 times of polishing on the metal base with emery, until no unevenness can be seen with the naked eye; Until the naked eye can not see the uneven scratches, finally remove the stains left on the metal substrate after polishing. The decontamination step is to immerse the substrate in the sodium hydroxide solution with a mass percentage of 20% for 20 minutes to remove part of the grease , and then put the taken out substrate into an acetone solution with a mass percentage of 99.9% for ultrasonic cleaning for 40 minutes and then take it out, then ultrasonically clean the substrate with distilled water for 15 minutes to remove the remaining reagent on the surface of the substrate, and finally air dry the taken out substrate in the room for 15 hours ;

[0031] On the p...

Embodiment 2

[0036] Carry out pretreatment to metal substrate carbon steel earlier; Described pretreatment step comprises polishing, polishing and decontamination step successively; Described polishing step is to adopt 300 # Polish the metal substrate 3 times with diamond sand until no scratches can be seen with the naked eye; then polish the metal substrate with a diamond abrasive paste with a diameter of 0.5 μm for 3 times until the surface of the substrate is polished Until no uneven scratches can be seen with the naked eye, finally remove the stains left on the metal substrate after polishing. The decontamination step is to immerse the substrate in a 5% sodium hydroxide solution by mass percentage, keep it for 5 minutes, and remove some Then put the removed substrate into 99.5% acetone solution by mass percentage for ultrasonic cleaning for 5 minutes, then take it out, then ultrasonically clean the substrate with distilled water for 5 minutes to remove the remaining reagent on the surfa...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
viewing angleaaaaaaaaaa
contact angleaaaaaaaaaa
Login to View More

Abstract

The invention discloses the efficient anti-fouling heat transfer surface of a nano coating, a method for preparing the heat transfer surface, and a pool boiling device, wherein, the heat transfer surface comprises a substrate; the substrate is coated with a nanometer material coating; the thickness of the coating is between 21 nm and 81 nm; the contact angle between the coating surface and water is 75 to 95 DEG; the contact angle between the coating surface and glycerol is 110 to 120 DEG; the surface energy is 100 to 120 mJ / m<2>; and the average roughness of the surface is 4 to 60 nm. The method comprises the following steps: (1) pre-processing the metal substrate; (2) preparing the heat transfer surface with the nano coating on the pre-processed substrate by adopting the method of vacuum deposition; and (3) post-processing the prepared heat transfer surface of the nano coating. Compared with the common pool boiling device, the pool boiling device consisting of the heat transfer surfaces has the advantages that the adhesion force against fouling is small; the heat-transfer coefficient is high; and the non-fouling running time is prolonged by at least 8 to 20 times.

Description

technical field [0001] The invention relates to a high-efficiency anti-scaling boiling evaporation technology and device, in particular to an energy-saving and anti-scaling heat transfer surface vacuum-coated with a nano coating, its preparation method and a pool boiling device. Background technique [0002] For heat exchange equipment in the process industry, especially evaporators with phase change, which are widely used in chemical, petrochemical, and metallurgical industries, fouling has always been one of the most common problems in the industry. Fouling will reduce heat transfer rate and evaporation capacity; increase system pressure drop, increase power consumption; frequent shutdown for cleaning, resulting in decreased productivity, etc. For the fouling phenomenon, although many solutions, including physical and chemical methods, are proposed, effective anti-scaling methods are still lacking at present. Today's developments in nanotechnology offer new hope for solvi...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): F28F13/18C23C14/24F22B1/28
Inventor 刘明言王燕
Owner TIANJIN UNIV