Bubble-drag-reduction-type marine mining riser

A technology of air bubbles and oceans, applied in the direction of mining minerals, special mining, drilling pipes, etc., can solve the problems of large fluid resistance and large energy consumption, and achieve the reduction of liquid viscosity coefficient, frictional resistance, and fluid frictional resistance. Effect

Inactive Publication Date: 2017-05-24
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the liquid flows in the standpipe, the inner wall of the s...

Method used

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  • Bubble-drag-reduction-type marine mining riser
  • Bubble-drag-reduction-type marine mining riser
  • Bubble-drag-reduction-type marine mining riser

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with specific examples and accompanying drawings.

[0022] The present invention provides a marine mining riser for air bubble drag reduction, such as Figure 1 to Figure 4 As shown, it includes an outer tube 1 and an inner tube 2 nested with each other, a main gas delivery pipe 4 arranged between the outer tube 1 and the inner tube 2, a nozzle 5, a gas delivery branch pipe 6 and a support structure 3; the gas delivery There is at least one main pipe 4, which is fixed on the outer wall of the inner pipe 2, and the main pipe 4 for gas transmission is used to connect with the gas supply equipment of the mining ship; the nozzles 5 are evenly distributed along the circumference of the inner pipe 2 to ensure that the air bubbles can cover the inner pipe. The inner wall of the pipe; one end of the nozzle 5 communicates with the inner pipe 2, and the other end of the nozzle communicates with the main gas tran...

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Abstract

The invention provides a bubble-drag-reduction-type marine mining riser. The bubble-drag-reduction-type marine mining riser comprises an outer tube, an inner tube, at least one gas transmission main pipe, spray nozzles, gas transmission branch pipes and a supporting structure, wherein the outer tube and the inner tube are mutually nested, and the gas transmission main pipes, the spray nozzles, the gas transmission branch pipes and the supporting structure are arranged between the outer tube and the inner tube; the at least one gas transmission main pipe are fixed on the external wall of the inner tube and are used for being connected with gas supply equipment of a mining dredger; the spray nozzles are uniformly distributed along the circumferential direction of the inner tube; one end of each spray nozzle communicates with the inner tube, and the other end of each spray nozzle communicates with the corresponding gas transmission main pipe through a corresponding gas transmission branch pipe; holes which are used for enabling the gas transmission branch pipes to pass through are formed in the supporting structure. The bubble-drag-reduction-type marine mining riser is supported by the mining dredger on the water, extends to an ocean floor and is connected with a mining collector system, and a gas-water mixed two-phase flow is formed on the internal surface of the inner tube through the spray nozzles arranged on the riser by using compressed air, so that the coefficient of viscosity of liquid is reduced, and the aim of reducing frictional drag is achieved.

Description

technical field [0001] The invention relates to the field of marine mining risers, in particular to a marine mining riser for air bubble drag reduction. Background technique [0002] The ocean is rich in mineral resources. With the depletion of land mineral resources, deep sea mining has become a hot spot for future development. Ocean mining uses the principle of liquid jets to lift ore through risers that are lowered from mining vessels to the sea floor. When the liquid flows in the standpipe, the inner wall of the standpipe has greater resistance to the fluid and consumes more energy. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a bubble drag-reducing marine mining riser, which can reduce the frictional resistance of the inner wall of the standpipe to the fluid. [0004] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a marine mining riser with ai...

Claims

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Application Information

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IPC IPC(8): E21C50/02E21B17/01
CPCE21C50/02E21B17/01
Inventor 徐双喜翟亚黄晨
Owner WUHAN UNIV OF TECH
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