CN103498988A

CN103498988A - Bionic erosion-resisting pipeline elbow

Info

Publication number: CN103498988A
Application number: CN201310478176.3A
Authority: CN
Inventors: 张成春; 章甘; 李雪丽; 王现宝; 王晶; 韩志武
Original assignee: Jilin University
Current assignee: Jilin University
Priority date: 2013-10-14
Filing date: 2013-10-14
Publication date: 2014-01-08
Anticipated expiration: 2033-10-14
Also published as: CN103498988B

Abstract

The invention discloses a bionic erosion-resisting pipeline elbow. Bionic ribs are evenly distributed on the erosion surface of the pipeline elbow, the spreading direction of each bionic rib is arranged in the flow direction, and the characteristic curve of the contact curve surface of each bionic rib and a flow field is a minor arc or a semicircle; alternatively, the spreading direction of each bionic rib perpendicular to the incoming flow direction, and the characteristic curve of the contact curve surface of each bionic rib and the flow field is two externally tangent arcs. The bionic rib structure of the bionic erosion-resisting pipeline elbow is the main position eroded by solid particles, the position is higher than the wall surface by a certain distance, and namely the thickness of the elbow is increased locally. The bionic ribs effectively control the near wall region flow field of a multiphase flow, so that the impact angle between the solid particles and the wall surface is controlled, and the wall surface of the pipeline elbow is effectively protected from the flow field control angle.

Description

A kind of bionical erosion resistance channel bend

Technical field

The present invention relates to a kind of pipe joint, particularly a kind of bionical erosion resistance channel bend.Belong to field of chemical engineering.

Technical background

Pressure piping is being carried fluid or containing having the advantages such as freight volume is large, efficiency is high, loss is low cost is low aspect the solid particle fluid, being widely used in the industries such as petrochemical industry, metallurgy, nuclear power, thermoelectricity, coalification, mine and building, is the important component part of industrial equipment.Only, with regard to the oil gas transport service, the oil of China existing 70% and 99% rock gas are by pipeline transport, and national oil and gas pipes total length reaches 80,000 kilometers, and during " 12 ", the newly-built duct length of China is estimated to reach 6.4 ten thousand kilometers.Pressure pipeline elbow is the heavy connection of pressure piping, because the elbow flow field change is violent, often bears the serious erosion corrosion of liquid fixed double phase flow wearing and tearing in use, causes the local attenuation of tube wall and loses efficacy, and causes huge economic loss.In some cases, also can cause the dielectric leakage welded tube, because it is sudden and high risk, tend to lead to serious production accident, to personal safety and even ecotope, all can cause the infringement that can't estimate.In developed countries such as China, Great Britain and America and Europe, the research that improves the erosive wear resistance of pipeline is the focus that the researcher pays close attention to always.

Tradition improves pipeline abrasion-resistance conventional method can to a certain degree can play the erosion resistant effect of raising pipeline as the relation etc. that adopts erosion resistant channel bend material, spraying erosion resistance coating and optimize channel bend and flow field parameter, but, because elbow is subject to the direct impact of solid particle, still be difficult to obtain desirable effect.The present invention is subject to the inspiration of the non-smooth property on aquatic animal surface and surface, sand dune, has proposed a kind of bionical erosion resistance surface of controlling near wall region multiphase flow flow field, strengthens the corrosion resisting property of elbow, closely improves working life.

Summary of the invention

Invention is subject to the inspiration of the non-smooth property on aquatic animal surface and surface, sand dune, a kind of bionical erosion resistance channel bend is provided, this bionical erosion resistance channel bend has the bionical erosion resistance surface that can control near wall region multiphase flow flow field, has strengthened the corrosion resisting property of elbow, and then has improved working life.

The present invention is subject to erosion surface evenly to be laid with bionical rib at channel bend;

Described bionical rib exhibition is to laying along flowing to, the indicatrix of bionical rib and flow field contact surface is one section minor arc or semicircle, difference according to continuous phase reynolds' number in channel bend, article two, between bionical rib, angle α is 3-15 °, bionical rib heights h is 0.2-4mm, and bionical rib cross section radius of arc is 0.2-5mm;

Described bionical rib exhibition to come flow path direction vertical, the indicatrix of bionical rib and flow field contact surface is two sections mutually circumscribed arcs, and according to the difference of continuous phase reynolds' number in channel bend, two bionical rib angle β are 3-12 °, bionical rib heights h is 0.2-4mm, the radius r of two sections arcs ₁for 0.2-5mm, r ₂for 1-20mm.

The invention has the beneficial effects as follows:

1, bionical rib structure is the main positions that solid particle are subject to erosion, and this zone exceeds the wall certain altitude, is equivalent to the thickness that part has increased elbow;

2, bionical rib is controlled the near wall region flow field of continuous phase of multiphase flow effectively, thereby has controlled the angle of attack of solid particle to wall, has effectively protected the wall of channel bend from the flow field control angle.

The accompanying drawing explanation

Schematic diagram is laid in the bionical rib following current that Fig. 1 is first embodiment of the invention.

Fig. 2 is that A-A in Fig. 1 is to sectional view.

Fig. 3 is that B-B in Fig. 2 is to sectional view.

The bionical rib structure schematic diagram that Fig. 4 is first embodiment of the invention.

The bionical rib that Fig. 5 is second embodiment of the invention with carry out the vertical schematic diagram of laying of flow path direction.

Fig. 6 be in Fig. 5 C-C to sectional view.

The bionical rib structure schematic diagram that Fig. 7 is second embodiment of the invention.

Embodiment

Refer to shown in Fig. 1 to Fig. 4, for the first embodiment of the present invention, the present embodiment is to be subject to erosion surface evenly to be laid with bionical rib 1 at channel bend, described bionical rib 1 exhibition is to laying along flowing to, bionical rib 1 is one section minor arc or semicircle with the indicatrix of flow field contact surface, and according to the difference of continuous phase reynolds' number in channel bend, between two bionical ribs, angle α is 3-15 °, bionical rib heights h is 0.2-4mm, and bionical rib cross section radius of arc r is 0.2-5mm.

In the present embodiment, when pipe diameter is 100mm, in pipe, two phase flow is respectively oil and the grains of sand, and the density of oil is 800kg/m ³viscosity is 0.048kg/ms, speed is 6m/s, the Mean particle diameter of sand grains is 0.55mm, and when flow is 2.2kg/s, the height h of bionical rib 1 is 0.5mm, bionical rib 1 cross section radius of arc r is 1.5mm, article two, when the angle α of bionical rib 1 is 5 °, Erosive Properties is preferably arranged, can guarantee that the pressure loss increases simultaneously little.

Refer to shown in Fig. 5 to Fig. 7, for the second embodiment of the present invention, the present embodiment is to be subject to erosion surface evenly to be laid with bionical rib 1 at channel bend, 1 exhibition of described bionical rib to come flow path direction vertical, the indicatrix of bionical rib 1 and flow field contact surface is two sections mutually circumscribed arcs, and according to the difference of continuous phase reynolds' number in channel bend, two bionical rib angle β are 3-12 °, bionical rib heights h is 0.2-4mm, the radius r of two sections arcs ₁for 0.2-5mm, r ₂for 1-20mm.

In the present embodiment, when pipe diameter is 100mm, in pipe, two phase flow is respectively oil and the grains of sand, and the density of oil is 800kg/m ³, viscosity is 0.048kg/ms, and speed is 15m/s, and the Mean particle diameter of sand grains is 0.3mm, and when flow is 0.8kg/s, bionical rib 1 height h is 0.6mm, the radius that forms two sections arcs of bionical rib 1 indicatrix is respectively r ₁for 2mm, r ₂for 4mm, when the angle β of two bionical ribs 1 is 10 °, erosion-wear-resisting performance is preferably arranged.

Claims

1. a bionical erosion resistance channel bend is characterised in that: be to be subject to erosion surface evenly to be laid with bionical rib at channel bend, described bionical rib exhibition is to laying along flowing to, or the exhibition of bionical rib to come flow path direction vertical.

2. a kind of bionical erosion resistance channel bend according to claim 1, be characterised in that: described bionical rib exhibition flows to while laying to edge, the indicatrix of bionical rib and flow field contact surface is one section minor arc or semicircle, article two, between bionical rib, angle α is 3-15 °, bionical rib heights h is 0.2-4mm, and bionical rib cross section radius of arc is 0.2-5mm.

3. a kind of bionical erosion resistance channel bend according to claim 1, be characterised in that: described bionical rib exhibition is to when coming flow path direction vertical, the indicatrix of bionical rib and flow field contact surface is two sections mutually circumscribed arcs, article two, bionical rib angle β is 3-12 °, bionical rib heights h is 0.2-4mm, the radius r of two sections arcs ₁for 0.2-5mm, r ₂for 1-20mm.