Selecting method of resistance reducing surface film for pipeline transporting soft clay and viscoplastic material

A viscoplastic material, pipeline transportation technology, applied in pipeline systems, mechanical equipment, gas/liquid distribution and storage, etc. Achieve the effect of reducing pipe wear, small resistance along the way, and reducing wall friction

Inactive Publication Date: 2015-03-04
ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Since the conveying pipe is a high-energy surface, the surface energy of the pipe wall is very large, so the adhesion work between the pipe wall and the material is also very large, and the adhesion force of the material on the pipe wall is very strong, resulting in a large resistance of the conveying pipe.

Method used

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  • Selecting method of resistance reducing surface film for pipeline transporting soft clay and viscoplastic material
  • Selecting method of resistance reducing surface film for pipeline transporting soft clay and viscoplastic material
  • Selecting method of resistance reducing surface film for pipeline transporting soft clay and viscoplastic material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1 Surface film selection test was carried out on soft clay with flat test panel.

[0032] The physical and mechanical indicators of soil samples: silty clay, water content 49.3%, soil particle specific gravity 2.73, void ratio 1.38, liquid limit 40.6%, plastic limit 20.1%, clay content 45%, permeability coefficient 9.69×10 -7 cm / s, compression coefficient 0.82MPa -1 , Consolidation coefficient 2.57×10 -3 cm 2 / s, compression modulus 2.5MPa, fast shear cohesion 11.7kPa, fast shear internal friction angle 7 degrees, solid fast cohesion 9.0kPa, solid fast internal friction angle 19 degrees.

[0033] Such as figure 1 As shown, the surface film selection tester includes: a moving plate (12) and an adjustment system arranged on the test bench, a lifting device connected to one end of the moving plate (12), the lifting device adopts a hydraulic push rod (9) method, and the top plate (6 ) is connected with moving plate (12) by hinge (4). A vibrator (11) with adjust...

Embodiment 2

[0036] Example 2 Surface film selection test of soft clay with curved panel.

[0037] Such as image 3 Shown, 3 curved panels (15) are fixed on the moving plate (12), and its curvature is the same as that of the delivery pipeline, and is made of the same material as the delivery pipeline inner wall and treated with the same surface treatment. Spray three different surface film liquids on each curved panel (15) to form a surface film layer (1), and then gently place three identical circular test pieces (16). The experimental method is the same as in Example 1. The experimental data obtained in this way are closer to the working conditions in actual transportation.

[0038] Such as figure 2 As shown, from the surface film selection tester, the weight (W) of the test piece, the contact area between the test piece and the test plate and the size of the moving plate (12) are known, not only can the comparison method be used to obtain the best surface film layer ( 1), and can a...

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Abstract

The invention relates to a selecting method of a resistance reducing surface film for pipeline transporting soft clay and viscoplastic materials, relating to the pipelining technology of viscoplastic material. The method comprises a calculating method of adopting the same material as the inner wall of a conveying pipeline and a test plate performed with the same surface treatment, performing a test comparison on a surface film selecting tester, confirming the weight of a test piece and a contact area of a test plate. So that the surface film resistance-reducing effect becomes easy, convenient and exact; the optimal film layer can be obtained, the relative parameter of the pipeline conveying can be calculated, therefore, the throughout is bigger, the transport distance is further, and the energy consumption is more saved; the method is simple in principle and convenient to calculate. The method is applicable to perform the selective test of various viscoplastic material resistance-reducing surface films.

Description

technical field [0001] The invention relates to pipeline transportation of viscoplastic materials, especially the pipeline transportation technology of soft clay. Background technique [0002] It has been nearly half a century since Toms and Kramer discovered that viscous drag reduction can be achieved by dilute polymer solutions or elastic material coverings. Since viscoplastic fluids exist everywhere in industrial production, drag reduction technology has It directly serves to save energy and improve efficiency, so it has attracted much attention. In recent years, research on drag reduction has made great progress. Many academic conferences on drag reduction have been held in the world, and drag reduction has developed into a special independent discipline. In addition to aviation and navigation, a lot of drag reduction research has been carried out in pipeline transportation, and in oil pipelines, in addition to heating viscosity reduction and drag reduction, magnetic dr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F17D1/16
Inventor 陶松垒李未材陶钧炳朱婉珍
Owner ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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