CN103018005A - Method for reducing erosive abrasion of solid particles on wall surface - Google Patents
Method for reducing erosive abrasion of solid particles on wall surface Download PDFInfo
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- CN103018005A CN103018005A CN2012105324934A CN201210532493A CN103018005A CN 103018005 A CN103018005 A CN 103018005A CN 2012105324934 A CN2012105324934 A CN 2012105324934A CN 201210532493 A CN201210532493 A CN 201210532493A CN 103018005 A CN103018005 A CN 103018005A
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Abstract
The invention discloses a method for reducing erosive abrasion of solid particles on a wall surface. By performing calculating on a large number of values and experimental verifying on a near-wall flow field with solid particles and ditching longitudinal grooves on the wall surface, the method can reduce the erosive abrasion of the solid particles on the wall surface and provides a ditching mode obvious in abrasion reduction effect, the required diameters of the particles for reducing abrasion rate and the range of incidence angles are defined, and the method is effective in reducing wall surface abrasion of gas-solid flowing systems in the engineering field of steel, machinery and pertrifaction.
Description
Technical field
The invention belongs to the erosion of wall field, particularly a kind ofly alleviate solid grain to the method for wall erosive wear.
Background technology
There is a large amount of gas-solid phase kinety systems at engineering fields such as iron and steel, machinery and petrochemical industry, such as two-phase turbomachine, strength conveying and dust arrester etc.Because the solid grain speed in the air-flow is very large, and often departs from streamline, so can produce impact wear to wall, accident potential is normally produced and brings in impact.Therefore, be necessary to study the erosion of wall behavior of such current system.Usually have two kinds of methods to alleviate erosion of wall, the first improves the resistance to abrasion of wall surface material, as use high-abrasive material, on wall coated with wear resistant material or wall carried out modification etc., but adopt this kind method often to cause cost to improve.It two is theoretical according to gas-solid phase, change the condition in nearly wall flow field by changing the wall shape, thereby speed and the track of the solid grain of impact finally alleviates solid grain to the wearing and tearing of wall.Research in recent years has adopts the method for welding rib on wall along the fluid vertical direction, though this method can alleviate wearing and tearing, brings the flow field supplementary loss; Other has the generation of introducing disturbance promotion coherent structure at the flow field entrance to alleviate wearing and tearing, although the antifriction effect of the method is better, and difficult enforcement.
The present invention is directed to the deficiencies in the prior art, considered cost, the flow field loss, the many factors such as feasibility, proposed to alleviate solid grain to the cost-effective method of wall erosive wear, and provided the most obvious mode of grooving of antifriction effect, defined the scope that obtains than the required grain diameter of low wear rate and incident angle.
Summary of the invention
The objective of the invention is for the deficiencies in the prior art, provide a kind of and alleviate solid grain to the method for wall erosive wear.
The objective of the invention is to be achieved through the following technical solutions: a kind ofly alleviate solid grain to the method for wall erosive wear, the method comprises:
(1) dig longitudinal groove at wall, and groove width equates with groove pitch;
(2) solid particle is machined to diameter less than the granule of 50 μ m;
(3) adjusting the solid particle incident angle is 10 ° ~ 30 ° or 70 ° ~ 90 °.
The invention has the beneficial effects as follows: the present invention is by digging longitudinal groove to alleviate solid grain to erosion of wall at wall; thereby in a kind of mode of lower cost to existing the equipment of a large amount of gas-solid phase kinety systems to play effective protection at engineering fields such as iron and steel, machinery and petrochemical industry; reduced the maintenance and replacement of equipment; reduced simultaneously the main equipment of long-time running because the accident potential that wearing and tearing bring; improve the stability and security of producing, thereby brought certain economic benefit.
Description of drawings
Fig. 1 is the test unit synoptic diagram;
Among the figure, gas-holder 1, pipeline 2, valve 3, pressure gauge 4, flowmeter 5, flyash silo 6, test specimen 7, separation vessel 8, collecting box 9, ventilation blower 10.
Embodiment
The present invention alleviates solid the method to the wall erosive wear: dig some longitudinal grooves at wall, to alleviate solid grain to erosion of wall.When groove width equates with groove pitch, alleviate the most pronounced effects of wearing and tearing.In the situation that wall and particulate material are determined, rate of wear depends on size and inflow point's particle motion of particle.When wall surface material is the A3 steel, wall length, width, thickness are 450mm * 120mm * 15mm, the grooved wall surface width, height and groove pitch are 6mm * 5mm * 6mm, are 1500kg/m for density
3Fly ash grain, when particle diameter is 0 ~ 50 μ m, when incident angle was 10 ° ~ 30 ° or 70 ° ~ 90 °, the rate of wear of unit mass particle can be less than 9mm
3Wherein rate of wear is defined as the erosion of wall Volume Loss that the unit mass particle that collides wall produces, and unit is mm
3Incident angle is defined as the angle between inflow point's particle motion and the horizontal direction, and unit is the number of degrees.
Because the solid grain speed in the air-flow is very large, and often departs from streamline, high with the measurement difficulty of the gouging abrasion of wall in field of turbulent flow to solid grain.Thereby its derivation reference of method proposed by the invention is based on numerical simulation and two kinds of methods of experimental verification.
Wherein model comprises nearly wall flow field model and granular model in the method for numerical simulation.Particle is subject to the effect of many kinds of force and moves in nearly wall flow field, adopt Lagrangian method to calculate the power that acts on solid, then obtains the movable information of solid grain, revises with regard to solid grain effect stream field again.Owing to there is local low reynolds number zone in the flow field that relates to, be difficult to direct application standard k-ε pattern, therefore need to adopt for the corrected k-ε of low reynolds number situation pattern.At first, under boundary condition, find the solution the speed that tubulence energy and dissipative shock wave obtain airflow field, the zoning is divided into subregion, and equation is obtained a series of algebraic equations, then iterative after the subregion upper integral.Secondly, count particles speed and track.The 3rd, consider the flow field velocity correction under the retroaction of particle stream field.The 4th, when particle was run into wall, bounce-back speed and the angle of count particles were calculated the wear extent of wall simultaneously.At last, after particle is run into wall, according to bounce-back speed and the angle of particle, continue to calculate since the 3rd one.During calculating, the granule number of each example is 80,000, and particle equidistantly distributes along y and z direction in the porch, and spacing is 1mm, and the particle of initial time is identical with the speed of air-flow, and the initial motion direction of particle is chosen at random.Calculate through a large amount of, finally draw and dig behind the longitudinal groove particle to the wearing and tearing of wall, and the relation of rate of wear and groove height and spacing, particle is on the impact of erosion of wall etc.
Methods of experiments such as Fig. 1, high pressure draught flows out from gas-holder 1, behind pipeline 2 process valve 3, pressure gauge 4 and flowmeters 5, the flyash that drives in the flyash silo 6 flows through test specimen 7, then isolate flyash by separation vessel 8, flyash recoverable in the collecting box 9, pipeline afterbody ventilation blower 10 is for generation of negative pressure.Gu grain adopts fly ash grain, density is 1500kg/m
3, average diameter of particles is 57 μ m.Wall surface material is the A3 steel, can regulate with the angle of air-flow, length, width, thickness are respectively 450mm * 120mm * 15mm, adopt not open channels and open channels width, height and groove pitch to be respectively three kinds of test specimens of 6mm * 5mm * 6mm and 8mm * 5mm * 6mm.Be full of gases at high pressure at gas-holder and make its pressure reach 0.392MPa, reynolds number Re ≈ 105, the flow field is turbulent flow.At first open ventilation blower 10 and produce enough negative pressure, can successfully flow through separation vessel 8 and enter collecting box to guarantee flyash; Open gas-holder valve 3 again, adjust pressure gauge 4 pressure to 0.294MPa, flowmeter 5 flows are approximately 28m
3/ h.Open subsequently flyash silo 6 valves, make flyash enter piping system, adjust valve and make flyash reach desired concn.In the process of the test, by continue adjusting flow to keep gas flow as constant, measure the mass loss of test specimen before and after test with the precision balance weighing, and with this as wear extent.
Key step is as follows:
The first step determines that solid grain adopts fly ash grain, and density is 1500kg/m
3, average diameter of particles is 57 μ m; Wall surface material is the A3 steel, can regulate with the angle of air-flow, length, width and thickness are respectively 450mm * 120mm * 15mm, adopt not open channels and open channels width, height and groove pitch to be respectively three kinds of test specimens of 6mm * 5mm * 6mm and 8mm * 5mm * 6mm; Reynolds number Re ≈ 105, the flow field is turbulent flow.Test granule number for method for numerical simulation is 80,000 at every turn, and particle equidistantly distributes along y and z direction in the porch, and spacing is 1mm, and the particle of initial time is identical with gas velocity, and the initial motion direction of particle is chosen at random.Under this condition of work, wall behind the cutting longitudinal groove is with respect to the wall of not digging longitudinal groove, the rate of wear of unit mass particle obviously reduces, and the open channels width, rate of wear was low when height was respectively 6mm * 5mm * 6mm than 8mm * 5mm * 6mm with groove pitch.Be full of gases at high pressure for experimental technique at gas-holder and make its pressure reach 0.392MPa, adjusting gas storage pot valves pressure is 0.294MPa, and the flowmeter flow is 28m
3/ h.Record 2 kinds of open channels test specimens with precision balance and be respectively 6.6mm corresponding to the wear extent of per unit mass particle
3And 7.8mm
3, and the open channels test specimen is not 10.6mm corresponding to the wear extent of unit mass particle
3, show that digging longitudinal groove at wall can alleviate solid grain to the wearing and tearing of wall, and rate of wear is lower when the open channels width equates with groove pitch.
Second step such as table 1, adopting groove width and the ratio of spacing is 3:1,2:1,1.5:1,1:1,1:1.5,1:2, rate of wear minimum when the ratio of the width of groove and groove pitch is 1:1 is found in the calculating of reporting during 1:3, rate of wear all increases when groove width is greater than or less than groove pitch, so antifriction effect is best when groove width equates with groove pitch.
Table 1: the rate of wear under the ratio of different groove width spacings
| Groove width, the ratio of spacing | 3:1 | 2:1 | 1.5:1 | 1:1 | 1:1.5 | 1:2 | 1:3 |
| Rate of wear (W, mm 3） | 7.8 | 7.2 | 6.5 | 5.3 | 6.2 | 6.8 | 7.4 |
The 3rd step was respectively 20,30 to particle size, 40 such as table 2, carry out the numerical value that numerical simulation draws rate of wear during 50,60,70,80 μ m, find that within the specific limits bulky grain increases the erosion of wall rate, and after particle size surpassed a certain critical value, size was less on the rate of wear impact.When particle diameter during less than 50 μ m, rate of wear is lower than 9mm
3, meet most engineering fields such as iron and steel, machinery and petrochemical industry to the requirement of rate of wear.
Table 2: the rate of wear under the variable grain diameter
| Particle diameter (d p,μm） | 20 | 30 | 40 | 50 | 60 | 70 | 80 |
| Rate of wear (W, mm 3） | 4 | 6.2 | 7.7 | 8.7 | 9.5 | 9.8 | 10 |
The 4th step is such as table 3, carry out respectively numerical evaluation when the particle incident angle is 10 ° to 90 ° and draw rate of wear numerical value, the direction of motion of finding inflow point's particle has direct impact to the erosion of wall rate, rate of wear is maximum when incident angle is 50 °, when incident angle was 10 ° ~ 30 ° or 70 ° ~ 90 °, the rate of wear of unit mass particle can be less than 9mm
3, meet most engineering fields such as iron and steel, machinery and petrochemical industry to the requirement of rate of wear.
Table 3: the rate of wear under the variable grain incident angle
| The particle incident angle (α, °) | 10 | 20 | 30 | 40 | 50 | 60 | 70 | 80 | 90 |
| Rate of wear (W, mm 3） | 5.2 | 7.8 | 9.0 | 10.8 | 11.8 | 11.2 | 8.2 | 4.6 | 0.4 |
Above-described embodiment is used for the present invention that explains, rather than limits the invention, and in the protection domain of spirit of the present invention and claim, any modification and change to the present invention makes all fall into protection scope of the present invention.
Claims (1)
1. one kind alleviates solid grain to the method for wall erosive wear, it is characterized in that the method comprises:
(1) dig longitudinal groove at wall, and groove width equates with groove pitch;
(2) solid particle is machined to diameter less than 50
Granule;
(3) adjusting the solid particle incident angle is about
Or
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105547886A (en) * | 2016-01-07 | 2016-05-04 | 浙江理工大学 | Quantitative forecasting method based on shock wave type impact wear rate speed index |
| CN106226031A (en) * | 2016-09-11 | 2016-12-14 | 浙江理工大学 | The experimental provision of particle-wall collision experiment in resisting medium |
| CN108647445A (en) * | 2018-05-11 | 2018-10-12 | 兰州理工大学 | A kind of computational methods applied to field of fluid machinery flow passage components erosion degree |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4212328A (en) * | 1977-02-18 | 1980-07-15 | Bridgestone Tire Company Limited | Wear resistant rubber hose |
| CN2117358U (en) * | 1992-01-23 | 1992-09-30 | 清华大学 | Wearproof y tube for air-solid or liquid-solid transmission system |
| CN2126225U (en) * | 1992-01-23 | 1992-12-30 | 清华大学 | Abrasive-resistant bent tube used in gas-solid and liquid-solid two phase conveying system |
-
2012
- 2012-12-07 CN CN2012105324934A patent/CN103018005A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4212328A (en) * | 1977-02-18 | 1980-07-15 | Bridgestone Tire Company Limited | Wear resistant rubber hose |
| CN2117358U (en) * | 1992-01-23 | 1992-09-30 | 清华大学 | Wearproof y tube for air-solid or liquid-solid transmission system |
| CN2126225U (en) * | 1992-01-23 | 1992-12-30 | 清华大学 | Abrasive-resistant bent tube used in gas-solid and liquid-solid two phase conveying system |
Non-Patent Citations (2)
| Title |
|---|
| X.Q. SONG, ET AL: "Research on reducing erosion by adding ribs on the wall in particulate two-phase flows", 《WEAR》 * |
| 林建忠等: "一种减轻固粒对壁面冲蚀磨损的新方法", 《摩擦学学报》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105547886A (en) * | 2016-01-07 | 2016-05-04 | 浙江理工大学 | Quantitative forecasting method based on shock wave type impact wear rate speed index |
| CN106226031A (en) * | 2016-09-11 | 2016-12-14 | 浙江理工大学 | The experimental provision of particle-wall collision experiment in resisting medium |
| CN106226031B (en) * | 2016-09-11 | 2024-01-23 | 浙江理工大学 | Experimental device for be used for granule in viscous medium and wall collision experiment |
| CN108647445A (en) * | 2018-05-11 | 2018-10-12 | 兰州理工大学 | A kind of computational methods applied to field of fluid machinery flow passage components erosion degree |
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Application publication date: 20130403 |