CN103336031B - Method for determining efficient demulsification electric field parameters of high-voltage pulse - Google Patents
Method for determining efficient demulsification electric field parameters of high-voltage pulse Download PDFInfo
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- CN103336031B CN103336031B CN201310263663.8A CN201310263663A CN103336031B CN 103336031 B CN103336031 B CN 103336031B CN 201310263663 A CN201310263663 A CN 201310263663A CN 103336031 B CN103336031 B CN 103336031B
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Abstract
The invention discloses a method for determining efficient demulsification electric field parameters of a high-voltage pulse. The method comprises the following steps of: (1) acquiring an optimal demulsification electric field parameter calculation curve graph on the basis that when the electric field frequency is the parametric excitation resonant frequency of liquid drop and the drawing ratio of the liquid drop is 1.9, a demulsification effect of emulsification liquid drop is optimal and energy consumption is minimum; and (2) acquiring a t value according to an equation shown in the description, intersecting a parallel line of a horizontal coordinate axis with a liquid drop amplitude curve of which lambda is 1.9 according to the t value in the optimal demulsification electric field parameter calculation curve graph, acquiring a value of optimal coalescence frequency omega<2>/omega 0<2> according to the intersection point so as to calculate the electric field frequency, drawing a vertical line relative to the horizontal coordinate axis according to the intersection point, and intersecting the vertical line with the horizontal axis at an intersection point which corresponds to an m value so as to calculate external electric field intensity E through an equation shown in the description. Through drawing calculation, the magnitude of the electric field frequency and the electric field intensity for realizing efficient demulsification and dehydration can be obtained. The method is quick in calculation, easy to operate, reliable in result and full in theoretical basis.
Description
Technical field
The present invention relates to the improvement of Breakdown Emulsion by Pulse Electric Field technology, particularly a kind of method determining the efficient breakdown of emulsion electric pulse field parameter of high-voltage pulse, belongs to oil emulsion demulsification technology field.
Background technology
Along with the fast development of global industry economy, lubricating oil is widely used in the fields such as machinery, electric power, transport and chemical industry, is described as " blood " of modern industry, in the national economic development, occupies critical role.Due to the impact of the factor such as steam and cooling system in rainwater, wet environment, lubricating oil is very easily polluted by water in storage, transport, filling and use procedure, forms w/o type emulsion.Water in lubricating oil exists with three kinds of forms, i.e. free water, free water and emulsified water, and the harm of emulsified water to equipment is maximum, and the difficulty of removing is also larger.
Common oil emulsion physics breaking dehydrating method has sedimentation, centrifuge method, vacuum method, absorption method and the poly-method of knot etc., but has that efficiency is low, energy consumption is high, equipment maintenance cost high, cannot meet high efficiency and the cost-effectiveness requirement of lubricant oil dewatered clean.In lube purification processing power, the processing accuracy of the precipitation method, centrifuge method is not high, and electrostatic method can only process the little fluid of water cut, and the treatment capacity of filtration method and seasoning is very little, and these methods are not industrially all widely used.
As a new technology, impulse electric field method is carried out breaking emulsion and dewatering and is become a new research direction, and it is the voltage applying certain frequency and intensity to oil emulsion, promote droplets of emulsified oil generation high vibration and efficient knot poly-.Appropriate electric pulse field parameter is the key factor promoting that droplets of emulsified oil generation high vibration and efficient knot gather, also be the important evidence of design efficient electric dehydration plant, therefore the selection of high-voltage pulse electric field parameters (comprising electric field intensity and electric field frequency), directly affect the breaking emulsion and dewatering efficiency of fluid.But at present, most of Breakdown Emulsion by Pulse Electric Field research is still in the Germicidal efficacy stage, for how determining that best breakdown of emulsion current field condition and parameter also rarely have report.Main some empirical methods that adopt are selected and determine breakdown of emulsion electric pulse field parameter at present, are theoretically unsound and versatility, and poor effect.
Summary of the invention
For prior art above shortcomings, the object of this invention is to provide a kind of method determining the efficient breakdown of emulsion electric pulse field parameter of high-voltage pulse, this method can determine best breakdown of emulsion electric pulse field parameter-electric field frequency and electric field intensity.
In order to solve the problems of the technologies described above, present invention employs following technical scheme:
Determine a method for the efficient breakdown of emulsion electric pulse field parameter of high-voltage pulse, it is characterized in that: its determining step is,
1) best breakdown of emulsion electric pulse field parameter calculated curve figure is first obtained
Under Electro-pulsing Field, droplets of emulsified oil generation dilatation vibrates, if initial radium is R; With the right hemisphere of single drop for research object, vibrate that certain is instantaneous at drop deformation, it is approximately semiellipsoid, and long and short half axial length of drop is respectively a, b, is true origin, sets up Cartesian coordinates with geometric center, and now, it is F that deformation vibration drop is subject to inertial force
i, oil liquid resistance is F
r, interface restoring force is F
hbe F with electric field excitation power
e, then drop vibration dynamics model general expression can be expressed as
F
i+F
r+F
h=F
e（1）
Instantaneous stressed by analytical calculation deformation vibration drop, its vibration dynamics equation can be expressed as
Wherein, drop vibration amplitude χ=△/R, drop major semi-axis elongation △=a-R, has a=(χ+1) R;
the nonlinear function item that f (χ) and e (χ) is each stressed item; A, B, G are constant, are respectively
q (t) represents Electric Field Function item;
Because in oil, drop draw ratio λ (λ=a/b) infinitely can not increase along with the increase of electric field intensity, there is limit value in λ, i.e. λ≤1.9, and when λ=1.9, during drop parametric resonance, demulsification is best, but resonance amplitude can not exceed higher limit; Therefore, using the important controlled condition of λ≤1.9 as the steady-state deformation of drop parametric resonance, thus, electric field frequency is drop parametric resonance frequency, and when drop draw ratio is 1.9, emulsion droplet demulsification is best and energy consumption is minimum; Therefore solve optimum vibration frequency and the amplitude thereof of formula (2) by harmonic wave equilibrium method, obtain best breakdown of emulsion electric pulse field parameter calculated curve figure;
2) best breakdown of emulsion electric pulse field parameter defining method
2.1) according to concrete systematic parameter: oil viscosity μ, fluid-droplet interfaces tension stress γ, drop density ρ, drop mean radius R, substitutes into
draw concrete t value; In best breakdown of emulsion electric pulse field parameter calculated curve figure, according to t value, make the parallel lines of abscissa line, parallel lines meet at the drop amplitude curve of λ=1.9, can draw the poly-frequency of best knot according to intersection point
value, wherein
electric field frequency can be calculated thus; If intersection point is positioned at
the top of curve, represents that in this system, drop is without " resonance " frequency, and there is not the poly-frequency of best knot, now breakdown of emulsion electric field frequency is lower, and demulsification is better;
2.2) making vertical line according to intersection point to abscissa line, also there is an intersection point in transverse axis in vertical line, and a corresponding m value, known parameters: fluid-droplet interfaces tension stress γ, drop mean radius R, permittivity of vacuum ε
0, fluid DIELECTRIC CONSTANT ε
2; Above-mentioned parameter is substituted into
calculate electric field strength E, according to the geometric parameter of electrode, the poly-supply voltage of best knot can be drawn.
Compared with prior art, the present invention has the following advantages:
1. the present invention uses nonlinear vibration kinetic theory, and draw high-pressure pulse electric efficient breakdown of emulsion electric pulse field parameter defining method, theoretical foundation is abundant.
2., under the condition of known oil viscosity, droplets of emulsified oil mean grain size, fluid-droplet interfaces tension stress, drop density, calculated by mapping, just can the accomplished electric field frequency of efficient breaking emulsion and dewatering and the size of electric field intensity.
This method calculates quick, simple to operate, reliable results, and theoretical foundation is abundant.No matter be in oil dehydrating or in lubricant oil regeneration purification, the method is all applicable, possess good versatility, applying of paired pulses electric field breaking emulsion and dewatering technology possesses good facilitation.
Accompanying drawing explanation
The distortion of the right hemisphere of Fig. 1-drop calculates schematic diagram.
Fig. 2-best breakdown of emulsion electric pulse field parameter calculated curve figure.
Fig. 3-determine best breakdown of emulsion electric pulse field parameter schematic diagram.
Fig. 4-Experimental equipment of the present invention.
Fig. 5-the present invention four kinds experiment oil product graphical method determines best breakdown of emulsion electric pulse field parameter schematic diagram.
Embodiment
The present invention is from the best breakdown of emulsion condition of droplets of emulsified oil aerodynamic point research impulse electric field and determination method for parameter thereof, its thinking is: emulsion droplet vibration dynamics angle from oil emulsion, the non-linear Parametric excitation of analytical calculation emulsion droplet in high-pressure pulse electric, obtain drop parametric resonance frequency and resonance amplitude, in conjunction with the stable state stretcher strain controlled condition of drop in high-pressure pulse electric, obtain drop stable state draw resonance condition control chart; Under known oil viscosity, droplets of emulsified oil mean grain size, fluid-droplet interfaces tension stress, drop density four kinds of Parameter Conditions, utilize control chart, mapping can be calculated the value that impulse electric field realizes the efficient breaking emulsion and dewatering electric field frequency of emulsification fluid and electric field intensity.
One, best breakdown of emulsion electric pulse field parameter calculated curve figure is first obtained
Under Electro-pulsing Field, droplets of emulsified oil generation dilatation vibrates, if initial radium is R.With the right hemisphere of single drop for research object, vibrate that certain is instantaneous at drop deformation, it is approximately semiellipsoid, and long and short half axial length of drop is respectively a, b, and diaxon deformation velocity is respectively
with
suppose that geometric center remains unchanged, take geometric center as true origin, set up Cartesian coordinates, as Fig. 1.
In this moment, it is F that deformation vibration drop is subject to inertial force
i, oil liquid resistance is F
r, interface restoring force is F
hbe F with electric field excitation power
e, then drop vibration dynamics model general expression can be expressed as
F
i+F
r+F
h=F
e（1）
Instantaneous stressed by analytical calculation deformation vibration drop, its vibration dynamics equation can be expressed as
Wherein, drop vibration amplitude χ=△/R, drop major semi-axis elongation △=a-R, has a=(χ+1) R;
the nonlinear function item that f (χ) and e (χ) is each stressed item; A, B, G are constant, are respectively
q (t) represents Electric Field Function item.
In oil, drop draw ratio λ (λ=a/b) infinitely can not increase along with the increase of electric field intensity, and λ exists limit value, i.e. λ≤1.9, and go beyond the scope if draw ratio is super, drop can be broken into rapidly several more droplets, runs counter to breakdown of emulsion.So, during drop parametric resonance, demulsification is best, but resonance amplitude can not exceed higher limit.Therefore, λ≤1.9 can be used as an important controlled condition of drop parametric resonance steady-state deformation.Thus, electric field frequency is drop parametric resonance frequency, and drop draw ratio is about 1.9, and emulsion droplet demulsification is best and energy consumption is minimum.Therefore solve optimum vibration frequency and the amplitude thereof of formula (2) by harmonic wave equilibrium method, obtain best breakdown of emulsion electric pulse field parameter calculated curve figure, as Fig. 2.
Two, best breakdown of emulsion electric pulse field parameter defining method
Concrete grammar and step as follows:
(1) according to concrete systematic parameter: oil viscosity μ, fluid-droplet interfaces tension stress γ, drop density ρ, drop mean radius R, substitutes into
draw concrete t value.In fig. 2, according to t value, make the parallel lines of abscissa line, parallel lines meet at the drop amplitude curve of λ=1.9, can draw the poly-frequency of best knot according to intersection point
value
generally intersection point exists
scope in, if occur, intersection point is positioned at
the top of curve, represents that in this system, drop is without " resonance " frequency, and there is not the poly-frequency of best knot, now breakdown of emulsion electric field frequency is lower, and demulsification is better.
(2) making vertical line according to intersection point to abscissa line, also there is an intersection point in transverse axis in vertical line, and a corresponding m value, known parameters: fluid-droplet interfaces tension stress γ, drop mean radius R, permittivity of vacuum ε
0, fluid DIELECTRIC CONSTANT ε
2.Above-mentioned parameter is substituted into
calculate electric field strength E, according to the geometric parameter of electrode, the poly-supply voltage of best knot can be drawn.
By above-mentioned 2 steps, according to known systematic parameter, utilize graphing method, the poly-frequency of fuel-displaced middle drop the best knot and the poly-field intensity of best knot can be obtained.Determine that above-mentioned two important electric pulse field parameters are the key links realizing the efficient breakdown of emulsion of oil emulsion impulse electric field.
Three, by specific embodiment, using method is described
An existing lubricating oil system, mean radius R=0.6 × 10 of drop in fluid
-3m, the DIELECTRIC CONSTANT ε of fluid
2=5.0, drop density ρ=1.0 × 10
3kgm
-3, oil viscosity μ=47.2 × 10
-3p
as, fluid-droplet interfaces tension stress γ=12.0 × 10
-3nm
-1.
First, calculate t value, due to
each parameter is substituted into, obtains t=1.056, the longitudinal axis (0, the 1.056) point crossing Fig. 3 makes the parallel lines of transverse axis, hands over " resonance " amplitude curve λ=1.9 in P point.Now, " resonance " frequency curve
also be intersected in P point, then do vertical line by a P to abscissa line and meet at transverse axis (0.187,0) point, i.e. m=0.187, as Fig. 3.
So the best electric field frequency ω that fluid impulse electric field knot gathers is
Angular frequency is converted into field operation frequency f=55Hz.Known each systematic parameter, by
the optimum electric field intensity E that can calculate drop knot poly-is
If the spacing of breakdown of emulsion field parallel electrode is 20mm, then supply voltage is 5820V.So work as the Breakdown Emulsion by Pulse Electric Field frequency f=55Hz of system applying, when pulse voltage amplitude is 5820V, the demulsification of oil emulsion is ideal.So, according to the known parameters of oil emulsion system, according to defining method and the step of the poly-electric pulse field parameter of the best knot, utilize Fig. 2, use graphing method, output frequency and the voltage magnitude of the efficient breakdown of emulsion pulse power can be obtained.
Illustrate that the electric pulse field parameter that this method is determined is best below in conjunction with theoretical analysis and experimental data.
When the impulse electric field frequency applied equals drop parametric resonance frequency, the drop vibration in oil emulsion is the most violent, and namely resonance effect occurs, now λ is maximum.λ is larger, and oil emulsion breakdown of emulsion more for favourable, because large λ, increase the probability collided between drop, weakens droplet interfaces film strength.But drop deformation is also limited.When λ exceeds 1.9, drop will break, and resolves into some sub-drops, belongs to emulsion, the inverse process of breakdown of emulsion.So, using the controlled condition of λ=1.9 as drop resonance amplitude.So, drawn Fig. 2.In Fig. 2, λ=1.9 with
intersect, the ω crossing intersection point is drop resonant frequency, i.e. best breakdown of emulsion frequency, and drop resonance maximal draw ratio λ=1.9, are in maximum steady state deformation state.So the breakdown of emulsion electric pulse field parameter obtained by Fig. 2, is applied on breakdown of emulsion battery lead plate, droplets of emulsified oil generation peak swing resonates, but is in stead deformation state, and so this electric field is set forth and is best breakdown of emulsion electric pulse field parameter.
Verify below in conjunction with experiment, best so that the electric pulse field parameter that this method is determined to be described.
1 experimental apparatus and sample
The high-voltage pulse power source voltage output range of customization is 0 ~ 40kV, rate-adaptive pacemaker scope 0.1 ~ 2000Hz, and pulse duty factor 10 ~ 60% is adjustable; Motic series microscope, possesses 4 grades of enlargement factor object lens, with the data collector of shooting camera function; Experiment pool specification is 48mm × 46mm × 20mm, and material is transparent organic glass; Fine copper electrode specification is 48mm × 20mm × 2mm; Digital oscilloscope is U.S.'s Tyke TDS1001C-SC digital oscilloscope, for correcting high-voltage pulse power source; Glassware, stirrer etc.Experimental provision connects as shown in Figure 4.
Experiment oil sample is two imperial 70SN base oil, Mobil 100SN base oil, Fushun 150SN base oil and Nanchong base oils, and emulsifying agent is Span80.A certain amount of distilled water is added in 4 kinds of lube base oils respectively, adds a small amount of Span80, after being uniformly mixed, generate oil emulsion oil sample.The correlation parameter of Medium Oil and distilled water is in Table-1.
The correlation parameter of table 1 test medium
The determination of 2 best electric pulse field parameters
According to oil emulsion oil sample relevant system parameters prepared by imperial 70SN base oil two in table-1, can obtain
the longitudinal axis (0, the 2.7650) point crossing Fig. 4 makes transverse axis parallel lines, meets at P point with resonance amplitude curve λ=1.9.Resonant frequency curve simultaneously
cross P point, meet at transverse axis (0.2225,0) point, i.e. m=0.2225, as Fig. 5 (a) to abscissa line as vertical line by a P.Oil emulsion oil sample prepared by Mobil 100SN base oil, Fushun 150SN base oil and Nanchong base oil also can utilize said method obtain t, m and
value, as Fig. 5 (b)-(d).
The best electric field frequency ω=8126.3rads of Breakdown Emulsion by Pulse Electric Field of 70SN emulsification fluid can be obtained by Fig. 5 (a)
-1, power work frequency f=1294Hz.The optimum electric field intensity that drop knot is poly-
in experimental provision, the battery lead plate spacing of breakdown of emulsion electric field is 20mm, then pulse power voltage is 26.74kV.Therefore, be 1294Hz when system applies breakdown of emulsion impulse electric field frequency, when pulse voltage amplitude is 26.74kV, two imperial 70SN oil emulsion oil sample demulsification is ideal.Therefore, the best breakdown of emulsion electric field frequency of the oil emulsion oil sample of Mobil 100SN base oil, Fushun 150SN base oil and Nanchong base oil outfit and voltage are respectively 719Hz and 35.48kV, 823Hz and 25.68kV, 460Hz and 20.32kV.
3 experimental results
4 kinds of oil sample oil emulsions are injected respectively in the experiment pool of Fig. 4 experimental provision, battery lead plate applies a series of continuous print different frequency and amplitude square wave pulse voltage, pulse duty factor is 0.5, records the mean grain size of drop in oil under different current field condition at the basis of microscopic observation with shooting camera function.
Utilize image processing software to carry out analytical calculation to experimental image collection result, obtain the droplet radius distribution under different current field condition, respectively as following table.
70SN
100SN
150SN
Nanchong base-oil
In table, experimental data shows, 70SN oil emulsion pulse voltage be 26kV, under pulsed frequency is the conditioning of 1300Hz, the poly-effect of emulsion droplet knot is best, and size droplet diameter is 405 μm; For 100SN, the poly-pulse voltage of drop the best knot is 36kV, pulsed frequency is 700Hz, and it is 200 μm that maximum knot gathers particle diameter; The poly-pulse voltage of drop the best knot of 150SN is 26kV, pulsed frequency is 800Hz, and it is 390 μm that maximum knot gathers particle diameter; The poly-pulse voltage of the best knot of Nanchong base oil emulsion droplet is 20kV, pulsed frequency is 500Hz, and it is 205 μm that maximum knot gathers particle diameter.The poly-current field condition of the best knot of above-mentioned experiment and result of calculation substantially identical.
Claims (1)
1. determine a method for the efficient breakdown of emulsion electric pulse field parameter of high-voltage pulse, this method is used for determining best breakdown of emulsion electric field frequency and best breakdown of emulsion electric field intensity simultaneously, it is characterized in that: its determining step is,
1) best breakdown of emulsion electric pulse field parameter calculated curve figure is first obtained
Under Electro-pulsing Field, droplets of emulsified oil generation dilatation vibrates, if initial radium is R; With the right hemisphere of single drop for research object, vibrate that certain is instantaneous at drop deformation, it is approximately semiellipsoid, and long and short half axial length of drop is respectively a, b, is true origin, sets up Cartesian coordinates with geometric center, and now, it is F that deformation vibration drop is subject to inertial force
i, oil liquid resistance is F
r, interface restoring force is F
hbe F with electric field excitation power
e, then drop vibration dynamics model general expression can be expressed as
F
i+F
r+F
h＝F
e(1)
Instantaneous stressed by analytical calculation deformation vibration drop, its vibration dynamics equation can be expressed as
Wherein, drop vibration amplitude χ=Δ/R, drop major semi-axis elongation Δ=a-R, has a=(χ+1) R;
the nonlinear function item that f (χ) and e (χ) is each stressed item; A, B, G are constant, are respectively
q (t) represents Electric Field Function item;
Solved optimum vibration frequency and the amplitude thereof of formula (2) by harmonic wave equilibrium method, obtain best breakdown of emulsion electric pulse field parameter calculated curve figure;
2) best breakdown of emulsion electric pulse field parameter defining method
2.1) according to concrete systematic parameter: oil viscosity μ, fluid-droplet interfaces tension stress γ, drop density ρ, drop mean radius R, substitutes into
draw concrete t value; In best breakdown of emulsion electric pulse field parameter calculated curve figure, according to t value, make the parallel lines of abscissa line, parallel lines meet at the drop amplitude curve of λ=1.9, can draw the poly-frequency of best knot according to intersection point
value, wherein
electric field frequency can be calculated thus; If intersection point is positioned at
the top of curve, represents that in this system, drop is without " resonance " frequency, and there is not the poly-frequency of best knot, now breakdown of emulsion electric field frequency is lower, and demulsification is better;
2.2) making vertical line according to intersection point to abscissa line, also there is an intersection point in transverse axis in vertical line, and a corresponding m value, known parameters: fluid-droplet interfaces tension stress γ, drop mean radius R, permittivity of vacuum ε
0, fluid DIELECTRIC CONSTANT ε
2; Above-mentioned parameter is substituted into
calculate electric field strength E, according to the geometric parameter of electrode, the poly-supply voltage of best knot can be drawn.
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| CN104998438B (en) * | 2015-06-04 | 2016-08-17 | 重庆理工大学 | A kind of method improving the impulse electric field induction droplets of emulsified oil poly-efficiency of knot |
| CN107847816B (en) * | 2015-06-11 | 2020-07-31 | 科诺科菲利浦公司 | Method of tuning radio frequency to break emulsions |
| CN108088963B (en) * | 2018-02-08 | 2020-06-02 | 重庆工商大学 | Electric field application type determination method capable of efficiently agglomerating emulsified oil droplets |
| CN109868157B (en) | 2019-03-15 | 2021-05-25 | 重庆工商大学 | Double-field coupling dehydration device and parameter optimization method |
| CN109903820B (en) * | 2019-03-25 | 2021-03-16 | 重庆工商大学 | Method for determining optimal operation parameters of double-field coupling dehydration device |
| CN110083944B (en) * | 2019-04-28 | 2023-04-07 | 重庆理工大学 | Electromechanical coupling hybrid modeling method for electric drive system |
| CN112288159A (en) * | 2020-10-28 | 2021-01-29 | 施耐德电气（中国）有限公司 | Method and device for estimating energy-saving potential of power utilization place |
| CN112940775B (en) * | 2021-02-20 | 2021-08-17 | 东北石油大学 | Method for optimizing crude oil dehydration parameters of pulsed electric field |
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