CN103336031A - Method for determining efficient demulsification electric field parameters of high-voltage pulse - Google Patents
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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, 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 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. 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 the method for the efficient breakdown of emulsion electric pulse field parameter of a kind of definite high-voltage pulse belongs to oil emulsion demulsification technology field.
Background technology
Along with the fast development of global industrial economy, lubricating oil is widely used in fields such as machinery, electric power, transportation and chemical industry, is described as " blood " of modern industry, occupies critical role in the national economic development.Because the influence of factors such as steam and cooling system in rainwater, the wet environment, lubricating oil very easily is polluted by water in storage, transportation, filling and use, forms the w/o type emulsion.Water in the lubricating oil exists with three kinds of forms, i.e. free water, free water and emulsified water, and emulsified water is to the harm maximum of equipment, and the difficulty of removing is also bigger.
Common oil emulsion physics breaking emulsion and dewatering method has sedimentation, centrifuge method, vacuum method, absorption method and the poly-method of knot etc., but has characteristics such as efficient is low, energy consumption is high, equipment maintenance cost height, can't satisfy high efficiency and economy requirement that the lubricating oil dehydration purifies.On the lube purification processing power, the processing accuracy of the precipitation method, centrifuge method is not high, and electrostatic method can only be handled the little fluid of water cut, and the treatment capacity of filtration method and seasoning is very little, and these methods all are not widely used industrial.
As a new technology, the impulse electric field method is carried out breaking emulsion and dewatering and is become a new research direction, and it is the voltage that applies certain frequency and intensity to oil emulsion, promotes that droplets of emulsified oil generation high vibration and efficient knot are poly-.Appropriate electric pulse field parameter is to promote droplets of emulsified oil generation high vibration and the poly-key factor of efficient knot, it also is the important evidence of the efficient apparatus for electrodewatering of design, so the selection of high-pressure pulse electric parameter (comprising electric field intensity and electric field frequency) directly influences the breaking emulsion and dewatering efficient of fluid.Most of Breakdown Emulsion by Pulse Electric Field research still is in the experiment observation stage, for how determining that best breakdown of emulsion current field condition and parameter also rarely have report but at present.Main some empirical methods that adopt are selected and definite breakdown of emulsion electric pulse field parameter at present, be theoretically unsound and versatility, and poor effect.
Summary of the invention
At the prior art above shortcomings, the purpose of this invention is to provide the method for the efficient breakdown of emulsion electric pulse field parameter of a kind of definite high-voltage pulse, this method can be determined 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, the present invention has adopted following technical scheme:
The method of the efficient breakdown of emulsion electric pulse field parameter of a kind of definite high-voltage pulse is characterized in that: its determining step is,
1) at first obtains best breakdown of emulsion electric pulse field parameter calculated curve figure
Under the impulse electric field effect, the vibration of droplets of emulsified oil generation dilatation, establishing initial radium is R; Be research object with the right hemisphere of single drop, vibrate at drop deformation that certain is instantaneous, it is approximately semiellipsoid, and the long and short semiaxis length of drop is respectively a, b, is true origin with the geometric center, sets up Cartesian coordinates, and at this moment, it is F that the deformation vibration drop is subjected to inertial force
i, oil liquid resistance is F
r, the interface restoring force is F
hWith electric field excitation power be F
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;
F (χ) and e (χ) are each nonlinear function item of stressed; A, B, G are constant, are respectively
Q (t) represents the electric field function item;
Because drop draw ratio λ in the oil (λ=a/b) can infinitely not increase along with the increase of electric field intensity, there is limit value in λ, i.e. λ≤1.9, when λ=1.9, demulsification the best when resonating that the drop ginseng is sharp, but resonance amplitude can not exceed higher limit; Therefore, an important controlled condition of resonance stabilized distortion is swashed as drop ginseng in λ≤1.9, thus, electric field frequency is that the drop ginseng swashs resonant frequency, and the drop draw ratio is 1.9 o'clock, emulsion droplet demulsification the best and energy consumption minimum; Therefore can solve optimum vibration frequency and the amplitude thereof of formula (2) by harmonic wave equilibrium method, get best breakdown of emulsion electric pulse field parameter calculated curve figure;
2) best breakdown of emulsion electric pulse field parameter is determined method
2.1) according to concrete systematic parameter: oil viscosity μ, fluid-drop interface tension stress γ, drop density ρ, drop mean radius R, substitution
Draw concrete t value; In best breakdown of emulsion electric pulse field parameter calculated curve figure, according to the t value, make the parallel lines of coordinate transverse axis, 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
Can calculate electric field frequency thus; If intersection point is positioned at
The top of curve represents that drop does not have " resonance " frequency in this system, does not have the poly-frequency of best knot, and this moment, the breakdown of emulsion electric field frequency was more low, and demulsification is more good;
2.2) make vertical line according to intersection point to the coordinate transverse axis, also there is an intersection point in vertical line in transverse axis, and corresponding m value, known parameters: fluid-drop interface tension stress γ, drop mean radius R, permittivity of vacuum ε
0, the fluid DIELECTRIC CONSTANT
2The above-mentioned parameter substitution
Calculate extra electric field intensity E, according to the geometric parameter of electrode, can draw the poly-supply voltage of best knot.
Compared with prior art, the present invention has the following advantages:
1. the present invention uses the nonlinear vibration kinetic theory, draws the efficient breakdown of emulsion electric pulse field parameter of high-pressure pulse electric and determines method, and theoretical foundation is abundant.
2. under the condition of known fluid viscosity, droplets of emulsified oil mean grain size, fluid-drop interface tension stress, drop density, calculate electric field frequency that just can accomplished efficient breaking emulsion and dewatering and the size of electric field intensity by mapping.
This method is calculated quick, simple to operate, reliable results, and theoretical foundation is abundant.No matter be aspect oil dehydrating or lubricant oil regeneration purification aspect, the method all is suitable for, and possesses good versatility, and applying of paired pulses electric field breaking emulsion and dewatering technology possesses good facilitation.
Description of drawings
Synoptic diagram is calculated in the distortion of the right hemisphere of Fig. 1-drop.
Fig. 2-best breakdown of emulsion electric pulse field parameter calculated curve figure.
The best breakdown of emulsion electric pulse field parameter synoptic diagram of Fig. 3-determine.
Fig. 4-Experimental equipment of the present invention.
Four kinds of experiments of Fig. 5-the present invention oil product graphical method is determined best breakdown of emulsion electric pulse field parameter synoptic diagram.
Embodiment
The present invention is from the best breakdown of emulsion condition of droplets of emulsified oil dynamics angle research impulse electric field and determination method for parameter thereof, its thinking is: emulsion droplet vibration dynamics angle from oil emulsion, the non-linear ginseng excited vibration of analytical calculation emulsion droplet in high-pressure pulse electric, obtain the drop ginseng and swash resonant 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 fluid viscosity, droplets of emulsified oil mean grain size, fluid-drop interface tension stress, drop density four seed ginseng said conditions, utilize control chart, mapping is calculated and can be obtained the value that impulse electric field is realized the efficient breaking emulsion and dewatering electric field frequency of emulsification fluid and electric field intensity.
One, at first obtains best breakdown of emulsion electric pulse field parameter calculated curve figure
Under the impulse electric field effect, the vibration of droplets of emulsified oil generation dilatation, establishing initial radium is R.Be research object with the right hemisphere of single drop, vibrate at drop deformation that certain is instantaneous, it is approximately semiellipsoid, and the long and short semiaxis length of drop is respectively a, b, and the diaxon deformation velocity is respectively
With
Supposing that geometric center remains unchanged, is true origin with the geometric center, sets up Cartesian coordinates, as Fig. 1.
In this moment, it is F that the deformation vibration drop is subjected to inertial force
i, oil liquid resistance is F
r, the interface restoring force is F
hWith electric field excitation power be F
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;
F (χ) and e (χ) are each nonlinear function item of stressed; A, B, G are constant, are respectively
Q (t) represents the electric field function item.
Drop draw ratio λ in the oil (λ=a/b) can infinitely not increase along with the increase of electric field intensity, there is limit value in λ, and namely λ≤1.9 exceed this scope as if draw ratio, and drop can be broken into several more droplets rapidly, runs counter to breakdown of emulsion.So, demulsification the best when the drop ginseng swashs resonance, but resonance amplitude can not exceed higher limit.Therefore, λ≤1.9 can be used as the important controlled condition that the drop ginseng swashs the resonance stabilized distortion.Thus, electric field frequency is that the drop ginseng swashs resonant frequency, and the drop draw ratio is about 1.9, emulsion droplet demulsification the best and energy consumption minimum.Therefore can solve optimum vibration frequency and the amplitude thereof of formula (2) by harmonic wave equilibrium method, get best breakdown of emulsion electric pulse field parameter calculated curve figure, as Fig. 2.
Two, best breakdown of emulsion electric pulse field parameter is determined method
Concrete grammar and step are as follows:
(1) according to concrete systematic parameter: oil viscosity μ, fluid-drop interface tension stress γ, drop density ρ, drop mean radius R, substitution
Draw concrete t value.In Fig. 2, according to the t value, make the parallel lines of coordinate transverse axis, 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
Intersection point exists generally speaking
Scope in, if intersection point occurs and be positioned at
The top of curve represents that drop does not have " resonance " frequency in this system, does not have the poly-frequency of best knot, and this moment, the breakdown of emulsion electric field frequency was more low, and demulsification is more good.
(2) make vertical line according to intersection point to the coordinate transverse axis, also there is an intersection point in vertical line in transverse axis, and corresponding m value, known parameters: fluid-drop interface tension stress γ, drop mean radius R, permittivity of vacuum ε
0, the fluid DIELECTRIC CONSTANT
2The above-mentioned parameter substitution
Calculate extra electric field intensity E, according to the geometric parameter of electrode, can draw the poly-supply voltage of best knot.
By above-mentioned 2 steps, according to known systematic parameter, utilize graphing method, can get the poly-frequency of the best knot of fuel-displaced middle drop and the best and tie poly-field intensity.Determine that above-mentioned two important electric pulse field parameters are the key links that realize the efficient breakdown of emulsion of oil emulsion impulse electric field.
Three, by specific embodiment explanation using method
An existing lubricating oil system, the mean radius R=0.6 of drop * 10 in the fluid
-3M, the DIELECTRIC CONSTANT of fluid
2=5.0, drop density ρ=1.0 * 10
3Kgm
-3, oil viscosity μ=47.2 * 10
-3P
aS, fluid-drop interface tension stress γ=12.0 * 10
-3Nm
-1
At first, calculate the t value, because
Each parameter substitution, get t=1.056, the longitudinal axis (0, the 1.056) point of crossing Fig. 3 is made the parallel lines of transverse axis, hands over " resonance " amplitude curve λ=1.9 in the P point.At this moment, " resonance " frequency curve
Also be intersected in the P point, do vertical line by a P to the coordinate transverse axis again and meet at transverse axis (0.187,0) point, i.e. m=0.187 is as Fig. 3.
So the poly-best electric field frequency ω of fluid impulse electric field knot is
Angular frequency is converted into field operation frequency f=55Hz.Known each systematic parameter, by
Can calculate the poly-optimum electric field intensity E of drop knot is
If the spacing of breakdown of emulsion electric field parallel pole is 20mm, then supply voltage is 5820V.So as Breakdown Emulsion by Pulse Electric Field frequency f=55Hz that system applies, when pulse voltage amplitude was 5820V, the demulsification of oil emulsion was ideal.So, according to the known parameters of oil emulsion system, according to definite method and the step of the poly-electric pulse field parameter of the best knot, utilize Fig. 2, use graphing method, can obtain output frequency and the voltage magnitude of the efficient breakdown of emulsion pulse power.
Below in conjunction with theoretical analysis and the definite electric pulse field parameter the best of experimental data explanation this method.
When the impulse electric field frequency that applies equaled drop ginseng and swashs resonant frequency, the drop vibration in the oil emulsion was the most violent, and resonance effect namely takes place, and this moment, λ be maximum.λ is more big, and the oil emulsion breakdown of emulsion more for favourable, because big λ has increased the probability that collides between drop, has weakened drop interfacial film intensity.But drop deformation also is limited.When λ exceeded 1.9, drop will break, and resolved into some sub-drops, belonged to emulsion, the inverse process of breakdown of emulsion.So, the controlled condition of λ=1.9 as the drop resonance amplitude.So, drawn Fig. 2.Among Fig. 2, λ=1.9 with
Intersect, the ω that crosses intersection point is the drop resonant frequency, i.e. best breakdown of emulsion frequency, and drop resonance maximal draw ratio λ=1.9 are in the maximum steady state deformation state.So, by the breakdown of emulsion electric pulse field parameter that Fig. 2 obtains, be applied on the breakdown of emulsion battery lead plate, the resonance of droplets of emulsified oil generation peak swing, but be in the stead deformation state, this electric field is set forth and is best breakdown of emulsion electric pulse field parameter so.
Verify below in conjunction with experiment, best with the electric pulse field parameter that explanation this method is determined.
1 experimental apparatus and sample
The high-voltage pulse power source voltage output range of customization is 0～40kV, frequency output area 0.1～2000Hz, and pulse duty factor 10～60% is adjustable; The Motic series microscope possesses 4 grades of enlargement factor object lens, has the data collector of the camera function of making a video recording; The experiment pool specification is 48mm * 46mm * 20mm, and material is transparent organic glass; The fine copper electrode specification is 48mm * 20mm * 2mm; Digital oscilloscope is U.S.'s Tyke TDS1001C-SC digital oscilloscope, is used for proofreading and correct high-voltage pulse power source; Glassware, stirrer etc.Experimental provision connects as shown in Figure 4.
The experiment oil sample is two imperial 70SN base oils, Mobil 100SN base oil, Fushun 150SN base oil and Nanchong base oil, and emulsifying agent is Span80.A certain amount of distilled water is added respectively in 4 kinds of lube base oils, add a small amount of Span80, after mixing, generate the oil emulsion oil sample.The correlation parameter of medium oil and distilled water sees Table-1.
The correlation parameter of table 1 test medium
Determining of 2 best electric pulse field parameters
Oil emulsion oil sample relevant system parameters according to two imperial 70SN base oil preparations in the table-1 can get
Cross the longitudinal axis (0, the 2.7650) point of Fig. 4 and make the transverse axis line, meet at the P point with resonance amplitude curve λ=1.9.While resonant frequency curve
Cross the P point, meet at transverse axis (0.2225,0) point to the coordinate transverse axis as vertical line by a P, i.e. m=0.2225 is as Fig. 5 (a).For the oil emulsion oil sample of Mobil 100SN base oil, Fushun 150SN base oil and the preparation of Nanchong base oil also can utilize said method obtain t, m and
Value, as Fig. 5 (b)-(d).
Can be got the best electric field frequency ω=8126.3rads of Breakdown Emulsion by Pulse Electric Field of 70SN emulsification fluid by Fig. 5 (a)
-1, power work frequency f=1294Hz.The poly-optimum electric field intensity of drop knot
The battery lead plate spacing of breakdown of emulsion electric field is 20mm in the experimental provision, and then pulse power voltage is 26.74kV.Therefore, be 1294Hz when system applies breakdown of emulsion impulse electric field frequency, when pulse voltage amplitude was 26.74kV, two imperial 70SN oil emulsion oil sample demulsifications were ideal.Therefore, the best breakdown of emulsion electric field frequency of oil emulsion oil sample and the voltage of Mobil 100SN base oil, Fushun 150SN base oil and the outfit of Nanchong base oil are respectively 719Hz and 35.48kV, 823Hz and 25.68kV, 460Hz and 20.32kV.
3 experimental results
In the experiment pool of Fig. 4 experimental provision, inject 4 kinds of oil sample oil emulsions respectively, apply a series of continuous different frequencies and amplitude square wave pulse voltage at battery lead plate, pulse duty factor is 0.5, observes and record under the different current field conditions mean grain size of drop in the oil at the microscopically with shooting camera function.
Utilize image processing software that the experimental image collection result is carried out analytical calculation, obtain the droplet radius distribution under the different current field conditions, respectively as following table.
70SN
100SN
150SN
Nanchong base-oil
Experimental data shows in the table, and the 70SN oil emulsion is that 26kV, pulsed frequency are under the conditioning of 1300Hz in pulse voltage, and the poly-effect of emulsion droplet knot is best, and size droplet diameter is 405 μ m; For 100SN, the poly-pulse voltage of the best knot of drop is that 36kV, pulsed frequency are 700Hz, and the poly-particle diameter of maximum knot is 200 μ m; The poly-pulse voltage of the best knot of the drop of 150SN is that 26kV, pulsed frequency are 800Hz, and the poly-particle diameter of maximum knot is 390 μ m; The poly-pulse voltage of the best knot of Nanchong base oil emulsion droplet is that 20kV, pulsed frequency are 500Hz, and the poly-particle diameter of maximum knot is 205 μ m.The poly-current field condition of the best knot and the result of calculation of above-mentioned experiment are identical substantially.
Claims (1)
1. the method for the efficient breakdown of emulsion electric pulse field parameter of definite high-voltage pulse is characterized in that: its determining step is,
1) at first obtains best breakdown of emulsion electric pulse field parameter calculated curve figure
Under the impulse electric field effect, the vibration of droplets of emulsified oil generation dilatation, establishing initial radium is R; Be research object with the right hemisphere of single drop, vibrate at drop deformation that certain is instantaneous, it is approximately semiellipsoid, and the long and short semiaxis length of drop is respectively a, b, is true origin with the geometric center, sets up Cartesian coordinates, and at this moment, it is F that the deformation vibration drop is subjected to inertial force
i, oil liquid resistance is F
r, the interface restoring force is F
hWith electric field excitation power be F
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;
F (χ) and e (χ) are each nonlinear function item of stressed; A, B, G are constant, are respectively
Q (t) represents the electric field function item;
Because drop draw ratio λ in the oil (λ=a/b) can infinitely not increase along with the increase of electric field intensity, there is limit value in λ, i.e. λ≤1.9, when λ=1.9, demulsification the best when resonating that the drop ginseng is sharp, but resonance amplitude can not exceed higher limit; Therefore, an important controlled condition of resonance stabilized distortion is swashed as drop ginseng in λ≤1.9, thus, when electric field frequency is that the drop ginseng swashs resonant frequency, and the drop draw ratio is 1.9 o'clock, emulsion droplet demulsification the best and energy consumption minimum; Therefore can solve optimum vibration frequency and the amplitude thereof of formula (2) by harmonic wave equilibrium method, get best breakdown of emulsion electric pulse field parameter calculated curve figure;
2) best breakdown of emulsion electric pulse field parameter is determined method
2.1) according to concrete systematic parameter: oil viscosity μ, fluid-drop interface tension stress γ, drop density ρ, drop mean radius R, substitution
Draw concrete t value; In best breakdown of emulsion electric pulse field parameter calculated curve figure, according to the t value, make the parallel lines of coordinate transverse axis, 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
Can calculate electric field frequency thus; If intersection point is positioned at
The top of curve represents that drop does not have " resonance " frequency in this system, does not have the poly-frequency of best knot, and this moment, the breakdown of emulsion electric field frequency was more low, and demulsification is more good;
2.2) make vertical line according to intersection point to the coordinate transverse axis, also there is an intersection point in vertical line in transverse axis, and corresponding m value, known parameters: fluid-drop interface tension stress γ, drop mean radius R, permittivity of vacuum ε
0, the fluid DIELECTRIC CONSTANT
2The above-mentioned parameter substitution
Calculate extra electric field intensity E, according to the geometric parameter of electrode, can draw the poly-supply voltage of best knot.
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| CN109868157B (en) * | 2019-03-15 | 2021-05-25 | 重庆工商大学 | Double-field coupling dehydration device and parameter optimization method |
| US11135529B1 (en) | 2019-03-15 | 2021-10-05 | Chongqing Technology And Business University | Parameter optimization method for double-field coupling dehydrator |
| CN109903820A (en) * | 2019-03-25 | 2019-06-18 | 重庆工商大学 | A kind of method of determining double-field coupled dehydration device optimal operation parameter |
| 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 |
| CN110083944A (en) * | 2019-04-28 | 2019-08-02 | 重庆理工大学 | Power drive system mechanical-electric coupling hybrid modeling method |
| 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 |
| CN112940775A (en) * | 2021-02-20 | 2021-06-11 | 东北石油大学 | Method for optimizing crude oil dehydration parameters of pulsed electric field |
| 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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