Method for lowering water conveying pipe head losses

A technology of water delivery pipeline and water head, which is applied to the device for coating liquid on the surface, pretreatment surface, coating, etc., which can solve the problems of large water flow resistance, small pipe diameter, energy loss, etc., and improve operating efficiency, The effect of reducing head loss and reducing frictional resistance of water flow

Inactive Publication Date: 2016-03-02
CHINA INST OF WATER RESOURCES & HYDROPOWER RES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the coating of superhydrophobic materials in the existing water pipes only stays in the experimental stage. The diameter of the pipes is small, and the pipes are mainly made of metal pipes and plastics. The water flow rate is usually between 5 and 20m/s
With the implementation of projects such as the South-to-North Water Diversion Project, large-scale high-head hydropower stations have begun to be constructed one after another. Most of the water delivery pipelines used in high-head hydropower stations such as pumped storage are large-diameter and concrete pipes, which have higher surface

Method used

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  • Method for lowering water conveying pipe head losses
  • Method for lowering water conveying pipe head losses
  • Method for lowering water conveying pipe head losses

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Such as figure 1 As shown, the imitation sharkskin material 2 is directly pasted on the inner wall of the water delivery pipe 1, and the imitation sharkskin material used is a silicone rubber molded PU imitation sharkskin. The specific process is as follows:

[0059] 1. Surface treatment: (1) The inner and outer walls of the pipe are sanded with sandpaper to wipe off the rust and retain a certain roughness; (2) Use 2% sodium hydroxide solution to clean; (3) Blow dry with cold wind, and the drying is completed waiting for painting;

[0060] 2. Paste imitation shark skin material:

[0061] (1) Apply the neutral silicone sealant evenly on the inner surface of the surface-treated water pipeline with a brush, and the coating thickness is 0.03mm.

[0062] (2) Dry for 30 minutes. During drying, care must be taken that the surface of the coating is absolutely free from contamination.

[0063] (3) Paste the silicone rubber molded PU imitation shark skin on the surface of the ...

Embodiment 2

[0065] Such as figure 2 As shown, the base material 3 is first sprayed on the inner wall of the water pipeline 1, and then the imitation sharkskin material 2 is pasted. The imitation sharkskin material used is polyurethane-based imitation sharkskin. The specific process is as follows:

[0066] 1. Surface treatment, (1) sand the inner and outer walls of the pipe to wipe off the rust and retain a certain roughness; (2) use deionized water to clean; (3) dry it with cold wind, and wait for coating after drying. Pack;

[0067] 2. Spray base material: 3M94 primer adhesion promoter is atomized by a spray gun and attached to the inner surface of the water pipe; the thickness of the spray is 0.1mm, and it is dried at 60°C for 7 hours after spraying;

[0068] 3. Paste the imitation shark skin material:

[0069] (1) Apply the neutral silicone sealant evenly on the inner surface of the surface-treated water pipeline with a brush, and the coating thickness is 0.04mm.

[0070] (2) Dry f...

Embodiment 3

[0073] Such as image 3 As shown, the nano-superhydrophobic material 4 directly coats the inner wall of the water pipeline 1, and the nano-superhydrophobic material used is nano-organosilicon. The specific process is as follows:

[0074] 1. Surface treatment: (1) The inner and outer walls of the pipeline are polished with sandpaper to wipe off the rust and retain a certain roughness; (2) Use a mixed solution of 5% nitric acid and 5% hydrochloric acid to clean; (3) Use cold air Blow dry and wait for painting after drying;

[0075] 2. Spray nano-superhydrophobic material: atomize the nano-organosilicon material with a spray gun and attach it to the inner surface of the water pipe; after spraying, dry it at 60°C for 5 hours.

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Abstract

The invention provides a method for lowering water conveying pipe head losses. An antifriction material is attached or coats the inner wall of a water conveying pipe. The antifriction material is a sharkskin simulating antifriction material or a nanometer super-hydrophobic material. The sharkskin simulating antifriction material can be directly stuck to the surface of the water conveying pipe, the surface of the water conveying pipe can also be coated with a substrate material layer at first so as to improve the bonding force between the sharkskin simulating material and the pipe wall; the surface of the water conveying pipe can be coated with the nanometer super-hydrophobic material directly and can also be coated with a substrate material layer at first so as to improve bonding force between the nanometer material and the pipe wall. The nanometer super-hydrophobic material can be mixed with the nanometer antifriction material for use so as to achieve the purposes of lowering frictional resistance and resisting corrosion; the method can lower the adhesive power and flow resistance of the solid-liquid surface, the hydrophobic performance of the surface of the water conveying pipe is effectively improved, and linear losses in the pipe water conveying process are reduced.

Description

technical field [0001] The invention relates to the technical fields of water conservancy and hydropower engineering, hydrology and water resources engineering, and water environment engineering, in particular to a method for reducing water head loss of a water delivery pipeline. Background technique [0002] Hydropower is an important means of converting water energy into electrical energy and obtaining electricity. The installed capacity of my country's hydropower stations has reached 300 million kilowatts (300,000 MW), accounting for 27% of my country's total power generation, and occupies an important position in my country's energy structure. [0003] Most hydroelectric power generation requires the use of water diversion pipes to lead water from the reservoir to the hydroelectric generator. The long-term distance of the water diversion pipe to the reservoir is between tens of meters and several kilometers, and the pipe diameter and water flow in the pipe vary depending...

Claims

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Application Information

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IPC IPC(8): B05D1/38B05D1/02B05D1/28B05D3/00B05C7/00B05C7/02B05C11/10
CPCB05C7/00B05C7/02B05C11/10B05D1/02B05D1/28B05D1/38B05D3/00
Inventor 张国新高安泽魏鲁双张龑
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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