CN106294988B - A kind of method of determining hydrocyclone to mine pressure - Google Patents
A kind of method of determining hydrocyclone to mine pressure Download PDFInfo
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- CN106294988B CN106294988B CN201610644520.5A CN201610644520A CN106294988B CN 106294988 B CN106294988 B CN 106294988B CN 201610644520 A CN201610644520 A CN 201610644520A CN 106294988 B CN106294988 B CN 106294988B
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Abstract
The present invention provides a kind of determining hydrocyclone to the method for mine pressure, comprising: determines the structural parameters of hydrocyclone under target operating condition, the density of material to be fractionated, granularmetric composition and live feedstock concentrations；The flow field domain computation model of hydrocyclone is established using 3 d modeling software, and its grid is discrete；The grid of generation is imported in cfdrc Fluent software, the boundary condition of flow field domain computation model is set, and liquid phase viscosity is set, carries out numerical value calculating；The lower short-circuit flow of the air column of hydrocyclone interior flow field, zero-speed enveloping surface, lid and turbulence intensity, determine that optimum gives mine pressure under hydrocyclone target operating condition when extracting from numerical result and analyzing difference to mine pressure；The present invention is directed to objectives operating condition, sufficiently examines or check the structural parameters of hydrocyclone under the operating condition, the density of material to be fractionated, granularmetric composition and live feedstock concentrations, identified hydrocyclone and is more suitable for produced on-site to mine pressure.
Description
Technical field
The present invention relates to hydrocyclone technical field, method of specifically a kind of determining hydrocyclone to mine pressure.
Background technique
Hydrocyclone is the most widely used classifying equipoment in current dressing plant, hydroclone classification effect direct relation
To dressing plant's mineral processing index and economic benefit.Hydrocyclone to mine pressure be influence hydroclone classification effect it is important because
Element, to mine pressure will be in zone of reasonableness, can neither be too low and influence classification efficiency, and cannot be excessively high and waste energy consumption.
Currently, dressing plant's hydrocyclone usually relies on empirical equation or uses for reference similar production scene to come really to mine pressure
Fixed, these determine that method using hydroclone classification product as distinguishing rule, does not account for cyclone interior flow field characteristic, and
Hydroclone classification result is exactly determined by interior flow field, therefore determines to be suitable for mine based on its interior flow field characteristic
Pressure, it is practical and there is more pinpoint accuracy, to can guarantee that hydrocyclone be in optimum Working, give full play to oneself
Body advantage.
Summary of the invention
In view of the problems of the existing technology, the present invention provides a kind of determining hydrocyclone to the method for mine pressure.
Technical scheme is as follows:
A kind of determining hydrocyclone includes the following steps: to the method for mine pressure
Step 1, determine the structural parameters of hydrocyclone under target operating condition, the density of material to be fractionated, granularmetric composition and
Live feedstock concentrations；
The structural parameters of the hydrocyclone include: mineral-feeding pipe diameter, shell of column diameter, shell of column height, cone angle, sand sinking port
Diameter, overflow diameter, overflow pipe insertion depth, overflow thickness of pipe wall；
The density of the material to be fractionated refers to the real density of material to be fractionated；
The granularmetric composition of the material to be fractionated refers to the weight percent of each grade in material to be fractionated；
The structural parameters of step 2, the hydrocyclone according to step 1 are soft using 3 d modeling software SolidWorks
Part establishes the flow field domain computation model of hydrocyclone, and using ANSYS Meshing software that its grid is discrete, generated net
Lattice torsion resistance should be not higher than 0.8；
Step 3 imports step 2 grid generated in cfdrc Fluent software, sets flow field domain
The boundary condition of computation model, and liquid phase viscosity is set, then carry out numerical value calculating；
The boundary condition includes pressure entrance and the pressure outlet of hydrocyclone, and wherein pressure entrance is set as
Difference between 0.05MPa~0.20MPa gives mine pressure, and pressure outlet is set as local standard atmospheric pressure；
The liquid phase viscosityWherein, μwFor the viscosity of water, v-10μmFor the volume point of -10 μm of particles
Number, coefficient n=0.5~0.7；
Step 4, extracted from the obtained numerical result of step 3 and analyze it is different to mine pressure when hydrocyclone in
The air column in portion flow field, covers lower short-circuit flow and turbulence intensity at zero-speed enveloping surface, determines optimum under hydrocyclone target operating condition
Give mine pressure；
Optimum refers to that corresponding hydrocyclone interior flow field is special to mine pressure under the hydrocyclone target operating condition
Property meet simultaneously: cone section part Air core diameter and settling mouth of hydrocyclone diameter ratio less than 1；Bore section part zero-speed packet
Network face is without chamfering, and the vertical range ratio for boring point to hydrocyclone central axis at section 1/2 on zero-speed enveloping surface does not surpass
Cross 1.25；It covers lower short-circuit flow flow velocity and is not higher than 1m/s；Turbulence intensity peak is not higher than 1.
The utility model has the advantages that
1, it is directed to objectives operating condition, sufficiently examines or check structural parameters of hydrocyclone under the operating condition, material to be fractionated
Density, granularmetric composition and live feedstock concentrations are determined in the past by empirical equation or compared with using for reference the method at similar scene
Hydrocyclone be more suitable for produced on-site to mine pressure.
2, suitable to mine pressure to determine the present invention is based on the flow field characteristic of hydroclone classification result is determined, therefore
As a result more accurate.
3, the present invention replaces the operations such as cumbersome manual sampling, analysis using Numerical Computer Simulation, is more convenient fast
Victory, and use manpower and material resources sparingly.
4, hydroclone classification is by interior flow field the result is that determined, therefore based on its interior flow field characteristic suitable to determine
Preferably give mine pressure, it is practical and there is more pinpoint accuracy, to can guarantee that hydrocyclone is in optimum Working, sufficiently
It exerts advantages of oneself.
Detailed description of the invention
Fig. 1 is to influence schematic diagram of the mine pressure to air column in the specific embodiment of the invention, and (a) is to give mine pressure
Influence of the 0.05MPa to air column, (b) are influence to mine pressure 0.08MPa to air column, (c) is to give mine pressure 0.11MPa
Influence, (d) to air column are the influence to mine pressure 0.14MPa to air column；
Fig. 2 is to influence schematic diagram of the mine pressure to zero-speed enveloping surface in the specific embodiment of the invention, and (a) is to give mine pressure
Influence of the strong 0.05MPa to zero-speed enveloping surface, (b) are influence to mine pressure 0.08MPa to zero-speed enveloping surface, (c) is to mine
Influence of the pressure 0.11MPa to zero-speed enveloping surface, (d) are the influence to mine pressure 0.14MPa to zero-speed enveloping surface；
Fig. 3 is to mine pressure in the specific embodiment of the invention to the influence schematic diagram for covering lower short-circuit flow, and (a) is to give mine pressure
Strong 0.05MPa is to mine for the influence to mine pressure 0.08MPa to the lower short-circuit flow of lid, (c) to the influence of short-circuit flow, (b) under covering
Pressure 0.11MPa is the influence to mine pressure 0.14MPa to lower short-circuit flow is covered to influence, (d) for covering lower short-circuit flow；
Fig. 4 is to influence schematic diagram of the mine pressure to turbulence intensity in the specific embodiment of the invention, and (a) is to give mine pressure
Influence of the 0.05MPa to turbulence intensity, (b) are influence to mine pressure 0.08MPa to turbulence intensity, (c) is to give mine pressure
Influence of the 0.11MPa to turbulence intensity, (d) are the influence to mine pressure 0.14MPa to turbulence intensity；
Fig. 5 is different to practical classification gained granularity distribution curve figure under mine pressure in the specific embodiment of the invention；
Fig. 6 is to determine hydrocyclone to the method flow diagram of mine pressure in the specific embodiment of the invention.
Specific embodiment
Illustrate a specific embodiment of the invention below by Φ 50mm hydroclone classification poor iron ore:
A kind of determining hydrocyclone to mine pressure method, as shown in fig. 6, including the following steps:
Step 1, determine the structural parameters of hydrocyclone under target operating condition, the density of material to be fractionated, granularmetric composition and
Live feedstock concentrations；
The structural parameters of the hydrocyclone include: mineral-feeding pipe diameter, shell of column diameter, shell of column height, cone angle, sand sinking port
Diameter, overflow diameter, overflow pipe insertion depth, overflow thickness of pipe wall；
The density of the material to be fractionated refers to the real density of material to be fractionated；
The granularmetric composition of the material to be fractionated refers to the weight percent of each rank grade in material to be fractionated；
The structural parameters of hydrocyclone are as shown in table 1.
1 Φ 50mm hydrocyclone structural parameters list of table
Determine that poor iron ore granularmetric composition to be fractionated is as shown in table 2.
The poor iron ore granularmetric composition to be fractionated of table 2
Determine that scene feed weight concentration is 30%；The density of material to be fractionated is 2763kg/m3；The density of water is
998.2kg/m3, dynamic viscosity is 1.003 × 10-3pa·s；The density of air is 1.225kg/m3, dynamic viscosity 1.7894
×10-5Pa.s。
The structural parameters of step 2, the hydrocyclone according to step 1 are soft using 3 d modeling software SolidWorks
Part establishes the flow field domain computation model of hydrocyclone and using ANSYS Meshing software that its grid is discrete, generated net
Lattice torsion resistance should be not higher than 0.8；
According to parameter described in table 1, the flow field domain computation model in hydrocyclone is established simultaneously using SolidWorks software
It is using ANSYS Meshing that its grid is discrete, generated mesh torsion degree highest order 0.6.
Step 3 imports step 2 grid generated in cfdrc Fluent software, sets flow field domain
The boundary condition of computation model, and liquid phase viscosity is set, then carry out numerical value calculating；
In cfdrc Fluent, inlet porting is pressure entrance, and difference is respectively to mine pressure
0.05MPa, 0.08MPa, 0.11MPa and 0.14MPa；Overflow port and sand sinking port are set for pressure outlet, pressure outlet is set as
Local standard atmospheric pressure is 0 with respect to pressure；
Liquid phase viscosity μ is setmAre as follows:
Wherein, the viscosity, mu of waterw=1.7894 × 10-5Pas, the volume fraction v of -10 μm of example particles-10μmIt is soft for Fluent
Part calculates automatically, coefficient n=0.62；
Step 4, extracted from the obtained numerical result of step 3 and analyze it is different to mine pressure when hydrocyclone in
The air column in portion flow field, covers lower short-circuit flow and turbulence intensity at zero-speed enveloping surface, determines optimum under hydrocyclone target operating condition
Give mine pressure；
Optimum refers to that corresponding hydrocyclone interior flow field is special to mine pressure under the hydrocyclone target operating condition
Property meet simultaneously: cone section part Air core diameter and settling mouth of hydrocyclone diameter ratio less than 1；Bore section part zero-speed packet
Network face is without chamfering, and the vertical range ratio for boring point to hydrocyclone central axis at section 1/2 on zero-speed enveloping surface does not surpass
Cross 1.25；It covers lower short-circuit flow flow velocity and is not higher than 1m/s；Turbulence intensity peak is not higher than 1.
Difference is to the air column of hydrocyclone interior flow field corresponding to mine pressure, zero-speed enveloping surface, the lower short-circuit flow of lid
And turbulence intensity difference is as shown in Figure 1 to 4.
(a) is the influence to mine pressure 0.05MPa to air column in Fig. 1, (b) is to mine pressure 0.08MPa to air column
Influence, (c) be influence to mine pressure 0.11MPa to air column, (d) is influence to mine pressure 0.14MPa to air column；
As can be seen that hydrocyclone flow field not yet enters stable state when being 0.05MPa to mine pressure, the sky of section part is bored
Air column diameter is significantly greater than settling mouth of hydrocyclone diameter, i.e., its ratio is much larger than 1；When being higher than 0.08MPa to mine pressure,
The Air core diameter and settling mouth of hydrocyclone diameter ratio for boring section part are less than 1, therefore 0.08MPa is target hydraulic cyclone
The minimum of device gives mine pressure.
(a) is to 0.08MPa pairs of mine pressure for the influence to mine pressure 0.05MPa to zero-speed enveloping surface, (b) from Fig. 2
The influence of zero-speed enveloping surface, (c) are influence to mine pressure 0.11MPa to zero-speed enveloping surface, (d) is to give mine pressure 0.14MPa
Influence to zero-speed enveloping surface；As can be seen that the symmetry of zero-speed enveloping surface increases, and flow field is steady with the increase for giving mine pressure
Qualitative increase.When being 0.05MPa to mine pressure, d at section 1/2 is bored2With d1Ratio be 1.62, be unsatisfactory for requiring；With to mine
Pressure further increases, and hydrocyclone processed in units amount increases, but when fluid cannot from outlet (overflow port and sand sinking port) and
When being discharged, due to the collision between fluid and fluid and fluid and wall, the symmetry of zero-speed enveloping surface reduces again, i.e., such as Fig. 2
(d) shown in, there is upward chamfering in the position close to sand sinking port in zero-speed enveloping surface, i.e., 0.14MPa gives mine pressure under this operating condition
It is excessively high.
It is that lid, the influence of short-circuit flow, (b) are to mine pressure 0.08MPa to lid down to mine pressure 0.05MPa from Fig. 3 (a)
It is to 0.14MPa pairs of mine pressure to the influence of short-circuit flow, (d) under covering that the influence of lower short-circuit flow, (c), which are to mine pressure 0.11MPa,
Cover the influence of lower short-circuit flow, it can be seen that with the increase for giving mine pressure, radial velocity increases, and increases to cover lower short circuit flow rate
Add.When being 0.11MPa to mine pressure, covers lower short-circuit flow and have reached 1m/s.
The spatial distribution of turbulence intensity is most important along the orderly distribution of cyclone radial direction to particle.Fig. 4 (a) is to give mine pressure
Influence of the strong 0.05MPa to turbulence intensity, (b) are influence to mine pressure 0.08MPa to turbulence intensity, (c) is to give mine pressure
Influence of the 0.11MPa to turbulence intensity, (d) are the influence to mine pressure 0.14MPa to turbulence intensity, it can be seen that maximum rapid
Intensity of flow mainly appears on inside air column and its nearby, unstable due to flow field when small to mine pressure, causes maximum rapid
Intensity of flow is higher.With the increase for giving mine pressure, flow field is gradually stable, and when giving mine pressure 0.08MPa, maximum turbulence intensity value is most
Low, with further increasing to mine pressure, the processed in units amount of hydrocyclone increases, and highest turbulence intensity value also increases.
When being 0.08MPa and 0.11MPa to mine pressure, flow field turbulence intensity peak is not higher than 1.
Therefore for the Φ 50mm hydrocyclone under investigated operating condition, to guarantee that hydrocyclone air column stablizes shape
It is high at the symmetry of, zero-speed enveloping surface, cover lower short-circuit flow and be not higher than 1 not higher than 1m/s, turbulence intensity peak, i.e., it is optimal to give
Mine pressure is 0.08MPa~0.11MPa.
Fig. 5 is difference to resulting granularity distribution curve is actually classified under mine pressure, and curve is oblique at apportionment ratio 50% in figure
Rate represents classification efficiency.It can be seen from the figure that be that classification results obtained by 0.08MPa and 0.11MPa are almost the same to mine pressure,
To mine pressure be 0.14MPa when, classification results are slightly worse, and when to mine pressure be 0.05MPa when, classification results are obviously deteriorated.
Claims (1)
1. a kind of determining hydrocyclone is to the method for mine pressure, which comprises the steps of:
Step 1 determines the structural parameters of hydrocyclone under target operating condition, the density of material to be fractionated, granularmetric composition and scene
Feedstock concentrations；
The structural parameters of the hydrocyclone include: that mineral-feeding pipe diameter, shell of column diameter, shell of column height, cone angle, sand sinking port are straight
Diameter, overflow diameter, overflow pipe insertion depth, overflow thickness of pipe wall；
The density of the material to be fractionated refers to the real density of material to be fractionated；
The granularmetric composition of the material to be fractionated refers to the weight percent of each grade in material to be fractionated；
The structural parameters of step 2, the hydrocyclone according to step 1 are built using 3 d modeling software SolidWorks software
The flow field domain computation model of vertical hydrocyclone, and it is using ANSYS Meshing software that its grid is discrete, and generated grid is turned round
Curvature should be not higher than 0.8；
Step 3 imports step 2 grid generated in cfdrc Fluent software, and setting flow field domain calculates
The boundary condition of model, and liquid phase viscosity is set, then carry out numerical value calculating；
The boundary condition includes pressure entrance and the pressure outlet of hydrocyclone, and wherein pressure entrance is set as 0.05MPa
Difference between~0.20MPa gives mine pressure, and pressure outlet is set as local standard atmospheric pressure；
The liquid phase viscosityWherein, μwFor the viscosity of water, v-10 μm be -10 μm of particles volume fraction,
Coefficient n=0.5~0.7；
Step 4, extracted from the obtained numerical result of step 3 and analyze it is different to mine pressure when hydrocyclone inside stream
The air column of field, covers lower short-circuit flow and turbulence intensity at zero-speed enveloping surface, determines that optimum is to mine under hydrocyclone target operating condition
Pressure；
Optimum refers to that corresponding hydrocyclone interior flow field characteristic is same to mine pressure under the hydrocyclone target operating condition
When meet: cone section part Air core diameter and settling mouth of hydrocyclone diameter ratio less than 1；Bore section part zero-speed enveloping surface
Without chamfering, and the vertical range ratio for boring point to hydrocyclone central axis at section 1/2 on zero-speed enveloping surface is no more than
1.25；It covers lower short-circuit flow flow velocity and is not higher than 1m/s；Turbulence intensity peak is not higher than 1.
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| CN104462816A (en) * | 2014-12-09 | 2015-03-25 | 鞍钢集团矿业公司 | Method for determining separation size of hydrocyclone |
| CN105843998A (en) * | 2016-03-18 | 2016-08-10 | 石河子大学 | Numerical simulation and optimization method for parameters of solid-solid separation hydro-cyclones |
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| CN104462816A (en) * | 2014-12-09 | 2015-03-25 | 鞍钢集团矿业公司 | Method for determining separation size of hydrocyclone |
| CN105843998A (en) * | 2016-03-18 | 2016-08-10 | 石河子大学 | Numerical simulation and optimization method for parameters of solid-solid separation hydro-cyclones |
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| 水力旋流器固_液分离的CFD模拟研究;王伟;《中国优秀硕士学位论文全文数据库 工程科技Ⅰ辑》;20111215(第S2期);B021-173 |
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