A drag-reducing and heat-insulating polymer pipe, its preparation method and application

A technology of pipeline and hydrothermal method, applied in the field of pipeline, can solve the problems of increasing pipeline volume and material loss, the effect of drag reduction is not obvious, and it has no heat insulation effect, so as to save energy loss, improve multiple performance, and reduce cost. Effect

Active Publication Date: 2022-04-22
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The drag reduction in the pipeline is generally done by preparing a smooth surface on the inner wall of the pipeline, but this drag reduction effect is not obvious, and it does not have a heat insulation effect, and it is easy to conduct heat with the environment during the fluid transmission process
After heat radiation and heat conduction between hot fluid and surrounding environment, energy loss will result; after heat conduction between cold fluid and environment, more energy will be wasted
At present, the thermal insulation measures for pipeline heat transfer or refrigeration are mainly by wrapping the outer wall of the pipeline with thick heat insulation material, which will greatly increase the volume and material loss of the pipeline.

Method used

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  • A drag-reducing and heat-insulating polymer pipe, its preparation method and application
  • A drag-reducing and heat-insulating polymer pipe, its preparation method and application
  • A drag-reducing and heat-insulating polymer pipe, its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Coating the liquid metal on the inner wall of the pipeline with a coating thickness of 2 microns, and oxidizing under air conditions to obtain a thin layer of metal oxide.

[0038] (2) Place the pipe vertically in 100 mL of growth solution, heat to 90° C. under airtight conditions, and react for 10 hours to form ZnO nanostructures on the inner wall surface of the pipe.

[0039] (3) Add an appropriate amount of fluorosilane dropwise to the dry ZnO nanostructure, place it in a sealed container, heat it to 90°C under the condition of vacuum degree -0.1Mpa, and keep it for 6 hours to form a function with low surface energy Surface, so as to make drag reduction and heat insulation pipeline.

[0040] The formula of the growth liquid used in this example: 0.30 g of hexamethylenetetramine, 0.70 g of zinc nitrate, and 100 ml of deionized water.

experiment example 1

[0042] Carry out electron microscope scanning to the pipeline inner wall that embodiment 1 makes, the results are shown in figure 1 . The results show that the inner wall of the pipeline is modified by the nanocone structure.

[0043] Detect the hydrophobic angle of the pipeline inner wall before and after the modification of the method of embodiment 1 respectively, the results are shown in figure 2 . The results showed that, compared with before modification ( figure 2 b) Compared with the modified ( figure 2 a) The hydrophobic angle of the inner wall of the pipeline is significantly improved.

[0044] Detect respectively the turbulence performance of the pipeline inner wall before and after modification of the method of embodiment 1, the results are shown in image 3 . The results show that the fluid after modification ( image 3 a) The internal flow is a form of turbulence, the fluid is easy to break away from the surface, and the viscous force is very small; whil...

Embodiment 2

[0047] (1) Coating the liquid metal on the inner wall of the pipeline with a coating thickness of 5 microns and oxidizing under air conditions to obtain a thin metal oxide layer.

[0048] (2) Place the pipe vertically in the growth solution, heat to 90° C. under airtight conditions, and react for 12 hours to form ZnO nanostructures on the inner wall surface of the pipe.

[0049](3) Add an appropriate amount of fluorosilane dropwise to the dry ZnO nanostructure, heat it to 80°C under the condition of vacuum degree -0.1Mpa, and keep it for 8 hours to form a functional surface with low surface energy, so as to obtain a reduced surface energy. Resistance, insulation pipe.

[0050] The formula of the growth liquid used in this example: 0.30 g of hexamethylenetetramine, 0.20 g of zinc nitrate, and 100 ml of deionized water.

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Abstract

The invention relates to a pipeline, in particular to a drag-reducing and heat-insulating polymer pipeline and its preparation method and application. In the method, liquid metal is coated on the inner wall of the pipeline, and a thin layer of metal oxide is obtained on the inner surface of the pipeline after oxidation; nanostructures are formed on the inner surface of the pipeline through hydrothermal reaction; and the nanostructures are further treated with fluorosilane , forming a functional surface with low surface energy on the inner wall surface of the pipeline. The present invention is based on the fact that the surface of the super-hydrophobic and low-adhesion material has good self-cleaning and drag-reducing effects, and on the surface of the super-hydrophobic rough structure, due to the contribution of the nanostructure, it can have a good heat insulation effect. Therefore, the nanostructure treatment of the inner wall of the pipeline can effectively reduce the resistance during fluid transmission and improve the heat insulation effect of the pipeline.

Description

technical field [0001] The invention relates to a pipeline, in particular to a drag-reducing and heat-insulating polymer pipeline. Background technique [0002] The drag reduction in the pipeline is generally done by preparing a smooth surface on the inner wall of the pipeline, but the drag reduction effect is not obvious, and it has no heat insulation effect, and it is easy to conduct heat with the environment during the fluid transmission process. After thermal radiation and heat conduction between hot fluid and surrounding environment, energy loss will occur; after heat conduction between cold fluid and environment, more energy will be wasted. At present, the thermal insulation measures for pipeline heat transfer or cooling are mainly to wrap a thick heat insulation material on the outer wall of the pipeline, which will greatly increase the volume and material loss of the pipeline. Contents of the invention [0003] Aiming at the problems of fluid resistance and heat c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J7/06C23C2/38C23C8/12C08L83/04C08L27/06
CPCC08J7/06C23C2/38C23C8/12C08J2383/04C08J2327/06
Inventor 王磊刘静
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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