AU2021102472A4 - A Dual-Field Coupled Dewatering Device And A Method For Optimizing Parameters - Google Patents
A Dual-Field Coupled Dewatering Device And A Method For Optimizing Parameters Download PDFInfo
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- 238000000926 separation method Methods 0.000 claims abstract description 40
- 238000005457 optimization Methods 0.000 claims abstract description 16
- 230000003993 interaction Effects 0.000 claims abstract description 14
- 238000004088 simulation Methods 0.000 claims abstract description 12
- 238000004458 analytical method Methods 0.000 claims abstract description 11
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- 238000010586 diagram Methods 0.000 description 5
- 239000010687 lubricating oil Substances 0.000 description 5
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
- B01D17/02—Separation of non-miscible liquids
- B01D17/0217—Separation of non-miscible liquids by centrifugal force
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
- B01D17/06—Separation of liquids from each other by electricity
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
- B04C5/00—Apparatus in which the axial direction of the vortex is reversed
- B04C5/02—Construction of inlets by which the vortex flow is generated, e.g. tangential admission, the fluid flow being forced to follow a downward path by spirally wound bulkheads, or with slightly downwardly-directed tangential admission
- B04C5/04—Tangential inlets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
- B04C5/00—Apparatus in which the axial direction of the vortex is reversed
- B04C5/12—Construction of the overflow ducting, e.g. diffusing or spiral exits
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
- B04C5/00—Apparatus in which the axial direction of the vortex is reversed
- B04C5/14—Construction of the underflow ducting; Apex constructions; Discharge arrangements ; discharge through sidewall provided with a few slits or perforations
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Abstract
The present invention discloses a double-field coupled dewatering device and a method for
optimizing parameters. The method includes the following steps of: first determining parameters
to be optimized; simulating the double-field coupled dewatering devices one by one; determining
the optimal value range of each parameter to be optimized according to simulation results; then
determining the optimal parameter combination of the parameters to be optimized; simulating the
double-field coupled dewatering devices one by one; obtaining the separation efficiency of the
double-field coupled dewatering device under different optimization parameter combinations; and
determining the optimal optimization parameter combination according to the separation
efficiency. The present invention simultaneously considers the influence of a single parameter on
the separation efficiency and the influence of interaction between parameters on the separation
efficiency, and combines with the double-field coupled numerical simulation results to realize the
combined optimization of structure parameters or operation parameters of the double-field
coupled dewatering device by using Desing-Expert software for analysis. Further, the present
invention can provide a reasonable solution to the parameter matching problem of the coupled
dewatering device, and obtain the optimal parameter combination of the double-field coupled
dewatering device.
1)
Drawings of Descriptions
FIG.1
Determine the parameters to be optimized
Simulate the dual-field coupled dewateing device one
by one according to the parameters to beoptimized
Determine the optimal value range of each
parameter to be optimized according to simulation results
Determine the optimized parameter
combination of each parameter to be optimized
Simulate the dual-field coupled dewatering device
one by one according to theoptimized parameter combination
Obtain the separation efficiency of the dual-field coupled
dewatering device under different optimized parameter combinations
Establishafunctionalrelationshipbetweeneach
optimized parameter combination and the s eparation efficiency
Analyze the significance of anoptimized parameter
combination mo del through the functional relationship
Determine whether the optimized No
parameter combination meets the requirements
Yes
Determine the optimal parameter combination
Analyze the influence of the interaction between the
optimized parameter combinations on the s eparation efficiency
Determine theoptimal optimized parameter combination
FIG.2
Description
1)
Drawings of Descriptions
FIG.1
Determine the parameters to be optimized
Simulate the dual-field coupled dewateing device one by one according to the parameters to beoptimized
Determine the optimal value range of each parameter to be optimized according to simulation results
Determine the optimized parameter combination of each parameter to be optimized
Simulate the dual-field coupled dewatering device one by one according to theoptimized parameter combination
Obtain the separation efficiency of the dual-field coupled dewatering device under different optimized parameter combinations
Establishafunctionalrelationshipbetweeneach optimized parameter combination and the s eparation efficiency
Analyze the significance of anoptimized parameter combination mo del through the functional relationship
Determine whether the optimized No parameter combination meets the requirements
Yes
Determine the optimal parameter combination
Analyze the influence of the interaction between the optimized parameter combinations on the s eparation efficiency
Determine theoptimal optimized parameter combination
FIG.2
Descriptions
A Dual-field Coupled Dewatering Device and A Method for
Optimizing Parameters
[0001] The present invention relates to the field of waste oil treatment technology, and particularly to a dual-field coupled dewatering device and a method for optimizing parameters.
[0002] During transportation, storage, and long-term use of a lubricating oil, because of various factors, the lubricating oil is contaminated by water, causing oil decay and forming a waste lubricating oil.
[0003] Currently, a main method for treating a waste lubricating oil includes direct discharge, direct combustion, and regeneration. The waste lubricating oil that can be recycled accounts for about 40% of total consumption, which is of great significance for alleviating energy shortage, resource conservation and environmental protection. In many regeneration processes, the demulsification and dewatering treatments of an emulsified liquid are a very important link. For a waste oil emulsified liquid with high water content and complex compositions, various single methods have limitations in terms of processing cost, energy consumption and time consumption. Two or more methods are reasonably coupled or integrated to achieve efficient demulsification and dewatering treatments of the emulsified liquid, which is a future development trend.
[0004] Generally speaking, experiments or numerical simulations are performed by changing a single parameter or type, to obtain the optimal parameters according to the results of research experiments or numerical calculations. However, there is a non-linear relationship between the various parameters of the device, and the results obtained by a general optimization method are difficult to meet requirements. In addition, combining and optimizing a plurality of parameters can obtain more reasonable optimal parameters.
[0005] In view of this, the objective of the present invention is to provide a dual-field coupled dewatering device and a method for optimizing parameters. The device is a coupled demulsification dewatering device that integrates a high-voltage electric field and a cyclone centrifugal field to achieve highly efficient and fast processing of a waste oil emulsified liquid.
[0006] In order to reach the forgoing objective, the present invention provides following technical solutions:
[0007] A dual-field coupled dewatering device includes an overflow pipe, an inlet, a straight pipe section, a large cone section, a small cone section and an underflow pipe;
[0008] The overflow pipe and the inlet are arranged on the straight pipe section. The inlet is arranged on the outer wall of the straight pipe section. The inlet is arranged tangentially to the pipe wall of the straight pipe section so as to be suitable for a liquid flow to enter the straight pipe section at a certain speed and to be able to be rotationally flowed along the inner wall of the straight pipe section. The overflow pipe is arranged along an axial direction of the straight pipe section. The overflow pipe is located between the outer wall of the straight pipe section and the inner wall of the straight pipe section and arranged as a high-voltage electric field. The other side of the straight pipe section is connected to the large cone section. The other side of the large cone section is connected to the small cone section, and the other side of the small cone section is connected to the underflow pipe.
[0009] Further, the outer wall of the overflow pipe is provided with a positive electrode of a high-voltage power supply. The inner wall of the straight pipe section is provided with a negative electrode of the high-voltage power supply, so as to be suitable for forming a high-voltage electric field in a region between the outer wall of the overflow pipe and the inner wall of the straight pipe section.
[0010] Further, at least two inlets are symmetrically rotationally arranged on the straight pipe section.
[0011] Further, The straight pipe section, the large cone section, the small cone section, and the underflow pipe are connected as a whole by welding, and the overflow pipe and the straight pipe are connected by a bolt.
[0012] Further, a nominal diameter D at a junction of the large cone section and the small cone section is 20 mm-22 mm; the large cone section has 20°-22° of a large cone angle P; the small cone section has 5 °-6 ° of a small cone angle a.
[0013] A method for optimizing parameters of a dual-field coupled dewatering device includes the following steps of:
[0014] determining the parameters to be optimized;
[0015] simulating the dual-field coupled dewatering device one by one according to the parameters to be optimized;
[0016] determining the optimal value range of each parameter to be optimized according to simulation results;
[0017] determining the optimized parameter combination of each parameter to be optimized;
[0018] simulating the dual-field coupled dewatering device one by one according to the optimized parameter combination;
[0019] obtaining the separation efficiency of the dual-field coupled dewatering device under different optimized parameter combinations; and
[0020] determining the optimal optimized parameter combination according to the separation efficiency.
[0021] Further, the optimal optimized parameter combination is realized according to the following steps:
[0022] establishing a functional relationship between each optimized parameter combination and the separation efficiency;
[0023] analyzing the significance of an optimized parameter combination model through the functional relationship;
[0024] determining whether the optimized parameter combination meets requirements according to the results of significance analysis, if not, return to the previous step for the significance analysis;
[0025] if so, determining the optimized parameter combination;
[0026] analyzing the influence of the interaction between the optimized parameter combinations on the separation efficiency; and
[0027] determining the optimal optimized parameter combination.
[0028] Further, the parameters to be optimized of the dual-field coupled dewatering device include a nominal diameter D, a large cone angle , and a small cone angle a.
[0029] Further, a nominal diameter D at a junction of the large cone section and the small cone section is 20 mm-22 mm; the large cone section has 20 - 22 ° of a large cone angle p; the small cone section has 5 °-6 ° of a small cone angle a.
[0030] Further, the functional relationship between each optimized parameter combination and the separation efficiency is established and calculated according to the following formula:
E = 266 .26 - 8.798 xI - 12.43x - 1 197 x3 + 0.799 x x + 0.528 xIx3
2
[0031] 0.166x2X3 - L76x +0101x -0.12x2
E'i =1716 .68 + 11 .68x, - 29.9x, - 126.5x + 3.l 1x,x2 - 8.13 xx,
-2.2xx, +7.72x 1 +.43x2 +5.22x
[0032]
[0033] where, xl, x2 and x3 correspond to a, p and D, respectively; Ed, is a dewatering rate, %; Edo is a deoiling rate, %.
[0034] It is the optimal condition that the dewatering rate and the deoiling rate of the device reach the maximum value at the same time.
[0035] The optimal optimized parameter combination is obtained.
[0036] The present invention has the following beneficial effects:
[0037] The present invention provides a dual-field coupled dewatering device. By analyzing a relationship between setting of parameters of the device and the separation efficiency of the device, a method for optimizing the parameters of the device is obtained. The method simultaneously considers the influence of a single parameter on the separation efficiency and the influence of the interaction between the parameters on the separation efficiency, combines with dual-field coupled numerical simulation results, and performs analysis by DesingExpert software to obtain the optimal parameter combination of the dual-field coupled dewatering device.
[0038] The present invention can realize the combination and optimization of the structural parameters or operating parameters of the dual-field coupled dewatering device, can provide a reasonable solution to the parameter matching problem of the coupled dewatering device, and provide reference or guidance for the optimization design and the matching of the operating parameters of the subsequent coupled device.
[0039] In order to make the objectives, technical solutions and beneficial effects of the present invention clearer, the present invention provides the following drawings for illustration:
[0040] FIG.1 is a schematic diagram of a structural model of a dual-field coupled dewatering device.
[0041] FIG. 2 is a flowchart of a method for optimizing the parameters of a dual-field coupled dewatering device.
[0042] FIG. 3 is a schematic diagram of the separation efficiency of the coupled dewatering device under the condition of different small cone angles.
[0043] FIG. 4 is a schematic diagram of the separation efficiency of a coupled dewatering device under the conditions of different large cone angles.
[0044] FIG. 5 is a schematic diagram of the separation efficiency of the coupled dewatering device under the conditions of different nominal diameters.
[0045] FIG. 6 is the influence of interaction between a large cone angle and a small cone angle on a dewatering rate.
[0046] FIG. 7 is the influence of interaction between a small cone angle and a nominal diameter on a deoiling rate.
[0047] In the drawings: 1: Overflow pipe, 2: Inlet, 3: Straight pipe section, 4: large cone section, 5: small cone section; 6: underflow pipe.
[0048] The present invention is further described below with reference to the drawings and specific embodiments, so that the person skilled in the art can better understand and implement the present invention, but the embodiments cited are not intended to limit the present invention.
[0049] Embodiment 1
[0050] As shown in FIG. 1, Embodiment 1 provides a dual-field coupled dewatering device, including an overflow pipe, an inlet, a straight pipe section, a large cone section, a small cone section and an underflow pipe.
[0051] The overflow pipe and the inlet are arranged on the straight pipe section. The inlet is arranged on the outer wall of the straight pipe section. The inlet is arranged tangentially to the pipe wall of the straight pipe section so as to be suitable for a liquid flow to enter the straight pipe section at a certain speed and to be able to be rotationally flowed along the inner wall of the straight pipe section. The overflow pipe is arranged along an axial direction of the straight pipe section. The overflow pipe is located between the outer wall of the straight pipe section and the inner wall of the straight pipe section and arranged as a high-voltage electric field. The other side of the straight pipe section is connected to the large cone section. The other side of the large cone section is connected to the small cone section, and the other side of the small cone section is connected to the underflow pipe.
[0052] The outer wall of the overflow pipe is provided with a positive electrode of a high-voltage power supply. The inner wall of the straight pipe section is provided with a negative electrode of the high-voltage power supply, so as to be suitable for forming a high-voltage electric field in a region between the outer wall of the overflow pipe and the inner wall of the straight pipe section.
[0053] At least two inlets are symmetrically rotationally arranged on the straight pipe section.
[0054] The straight pipe section, the large cone section, the small cone section, and the underflow pipe are connected as a whole by welding, and the overflow pipe and the straight pipe are connected by a bolt.
[0055] A nominal diameter D at a junction of the large cone section and the small cone section is 20 mm-22 mm. The large cone section has 20°-22° of a large cone angle P, and the small cone section has 5 °-6 0 of a small cone angle u.
[0056] The dual-field coupled dewatering device provided in this embodiment uses a liquid flow with a certain speed to enter the straight pipe section, and the flow liquid rotationally flows along the inner wall of the straight pipe section to form a hydrocyclone liquid. The device can be placed at a certain angle.
[0057] Embodiment 2
[0058] As shown in FIG. 2, Embodiment 2 provides a method for optimizing the parameters of a dual-field coupled dewatering device. The method simultaneously considers the influence of a single parameter on the separation efficiency and the influence of the interaction between the parameters on the separation efficiency, combines with dual-field coupled numerical simulation results, and performs analysis by DesingExpert software to obtain the optimal parameter combination of the dual-field coupled dewatering device. The specific steps are as follows:
[0059] determining the parameters to be optimized;
[0060] simulating the dual-field coupled dewatering device one by one according to the parameters to be optimized; and simulating the device under a certain setting condition;
[0061] determining the optimal value range of each parameter to be optimized according to simulation results; determining the optimal value range of each parameter by studying the influence of changes in the single parameter on the separation efficiency of the coupled dewatering device;
[0062] determining the optimized parameter combination of each parameter to be optimized; determining different parameter combinations according to the parameters and the value ranges of the parameters.
[0063] simulating the dual-field coupled dewatering device one by one according to the optimized parameter combination; using different parameter combinations as the setting conditions for dual-field coupled numerical simulation calculation, and obtaining the separation efficiency of the device through emulating calculation;
[0064] obtaining the separation efficiency of the dual-field coupled dewatering device under different optimized parameter combinations; and
[0065] establishing a functional relationship between each optimized parameter combination and the separation efficiency; on this basis, using the parameters to be optimized as an input factor and the separation efficiency as an output factor, and using the Desing-Expert software to establish a function relationship between the input factor and the output factor;
[0066] analyzing the significance of an optimized parameter combination model through the functional relationship;
[0067] determining a parameter optimization model; analyzing the influence of interaction between the parameters on the separation efficiency, and obtaining the optimal combination of operating parameters according to the model;
[0068] determining whether the optimized parameter combination meets requirements according to the results of significance analysis, if not, return to the previous step for the significance analysis;
[0069] if so, determining the optimized parameter combination;
[0070] analyzing the influence of the interaction between the optimized parameter combinations on the separation efficiency; and
[0071] determining the optimal optimized parameter combination.
[0072] Embodiment 3
[0073] This embodiment uses the optimization of a cone structure of a dual-field coupled device as an example to illustrate a use method.
[0074] In this embodiment, a waste oil emulsified liquid is used as a background, and a dual-field coupled dewatering device is used as an optimization object. The optimization range of each parameter is obtained through an influence analysis of a single factor. Design-expert software is used to design the parameter combination of each input factor. By combining with dual-field coupled numerical simulation calculation, the output factors under each combination are obtained to obtain the parameter optimization model. According to the model, the optimal operating parameter combination of the dual-field coupled dewatering device is obtained.
[0075] As shown in FIG. 1, FIG. 1 is a structure model of a dual-field coupled dewatering device. The model mainly includes a straight pipe section, a large cone section, a small cone section and an underflow pipe. The straight pipe section includes one overflow pipe and two cylindrical inlets, and the two cylindrical inlets are tangent to the straight pipe section. The cylindrical outer wall of the overflow pipe is a positive electrode of a power supply, and the cylindrical inner wall of the straight pipe section is a negative electrode of a high-voltage power supply, and a high-voltage electric field is formed in a region between the two cylindrical walls. The emulsified liquid enters the region through the inlet, and a liquid flow enters through a tangential inlet and then appears to rotationally flow. The dispersed phase droplets in the emulsified liquid are agglomerated rapidly under the action of the high-voltage electric field to increase the particle size of the droplets and are separated quickly under the action of swirling flow. A Cartesian coordinate system with a center point of an underflow port as an original point, and a z-axis is along a central axis and points to an overflow port. The main structural parameters of the coupled dewatering device mainly include a nominal diameter D, the diameter Ds of a straight pipe section, the diameter Do of an overflow port, the diameter Di of the inlet, the extension length L. of an overflow pipe, the length Lu of the underflow pipe, the diameter Du of the underflow port, a large cone angle P, and a small cone angle a. In this study, Ds, Do, Di, Lo, Lu, and Du have 70mm, 18mm, 12mm, 45mm, 400mm, and 10mm of values, respectively, which are all remain unchanged.
[0076] Determination of the optimal value range of the parameters: the nominal diameter D, the large cone angle P and the small cone angle a are used as the parameters to be optimized. commercial CFD software ANSYS Fluent (ANSYS 15.0) is used to calculate a numerical model of the coupled device under different structural parameters.
[0077] The small cone angle: the large cone angle and the nominal diameter of the coupled dewatering device are set as 20 ° and 26 mm, respectively, and the small cone angles are 2 °, 3°, 4 °, 5 °, and 6 0. The separation efficiency is calculated according to the following formula:
[0078]
[0079] Where, when the dewatering rate of the overflow port is calculated, P is the water volume fraction of the overflow port, pi is the water volume fraction of the inlet. When the deoiling rate of the underflow port is calculated, T is the oil volume fraction of the underflow port, and pi is the oil volume fraction of the inlet.
[0080] The separation efficiency curve distribution of the device under the conditions of different small cone angles is shown in FIG. 3. FIG. 3 is the separation efficiency of the coupled dewatering device under the conditions of different small cone angles. It can be seen from FIG. 3 that the dewatering rate of the overflow port of the device first decreases, then increases, and then decreases. Although the dewatering rate decreases when the small cone angle is increased from 5 to 6 0, the dewatering rate is still higher than that under the other three conditions. Therefore, the device with a small cone angle within 5 °~6 ° has a better dewatering rate. The change trends of the deoiling rate of the underflow port of the coupled dewatering device are the same and are the same as that of the deoiling rate of the overflow port of the coupled dewatering device, that is, there is a greater deoiling rate in the range of 5 0 and 6 0 of the small cone angle. In summary, the coupled dewatering device has 5 °~6 ° of the optimized range of the small cone angle.
[0081] The large cone angle: the small cone angle and nominal diameter of the coupled dewatering device are set to be fixed, and are 3 0 and 26 mm, respectively. The voltage amplitudes are 0 and 11 kV, respectively, and the large cone angles are 16 0, 18 0, 20 0, 22 0 and 24 0. The separation efficiency of the coupled dewatering device is shown in FIG. 4. FIG. 4 is the separation efficiency of the coupled dewatering device under the conditions of different large cone angles. It can be seen from FIG. 4 that in the cone angle range of 20 0 - 22 0, the dewatering rate of the overflow port is significantly higher than that under other large cone angles. It can also be clearly seen from FIG. 4 that the change trend of the deoiling rate at the underflow port of the coupled device is basically the same as the dewatering rate at the overflow port. Therefore, the optimal value range of the large cone angle is 20 °~22 0.
[0082] The nominal diameter: the angles of the large and small cone sections are set to be 3 and 20 0, and both are fixed. The voltage amplitudes are 0 kV and11 kV, respectively. The nominal diameters are 20 mm, 22 mm, 24 mm, 26 mm, and 28 mm, respectively. The separation efficiency under the conditions of different nominal diameters is shown in FIG. 5. FIG. 5 is the separation efficiency of the coupled dewatering device under the conditions of different nominal diameters. It can be seen from FIG. 5 that in the nominal diameter range of 20 mm to 22 mm, there is a higher dewatering rate of the overflow port. The deoiling rate of the underflow port is basically the same in the diameter range of 20 mm-22 mm, and both are greater than the deoiling rate when the nominal diameter is 22 mm-28 mm. In summary, the nominal diameter has 20 mm-22 mm of the optimal value range.
[0083] Parameter combination design and separation efficiency calculation
[0084] According to the results of the influence analysis of the single factor, the optimal value ranges of the large cone angle, the small cone angle, and the nominal diameter are: 20°-22°, 5°-6°, and 20 mm-22 mm, respectively. The dewatering rate of the overflow outlet of the device and the deoiling rate of the underflow port of the device are used as output values, and the large cone angle, the small cone angle and the nominal diameter are used as input factors. The Design-Expert software is used to design the parameter combination of each input factor, and a numerical method is used to obtain the output value under each test conditions. The final results are shown in Table 1:
[0085] Table 1: Parameter combination design and emulation calculation results
[0086] Dewatering Deoiling No. Coded A B c rate/% rate/% 1 -1 -1 0 96.25 89.49 2 1 -1 0 95.37 77.52 3 -1 1 0 95.04 87.87 4 1 1 0 95.76 82.13
5 -1 0 -1 95.78 90.69 6 1 0 -1 94.74 90.05 7 -1 0 1 95.50 94.16 8 I 0 I 95.51 77.25 9 0 -1 -1 96.44 83.96 10 0 1 -1 95.24 85.17 11 0 -1 1 96.27 94.47 12 0 1 1 95.74 86.58 13 0 0 0 95.94 80.89 14 0 0 0 95.94 80.89 15 0 0 0 95.94 80.89 16 0 0 0 95.94 80.89 17 0 0 0 95.94 80.89
[0087] Parameter optimization model
[0088] The Design-Expert 8.0 software is used to analyze data in Table 1, and a multiple quadratic regression model is established as follows:
Ed =266.26 - 8.798 x -12A3 x2 -113 + 0-.799 xx2 + 0,.528 x x3
2 -0.12x (2)
[0089] 0.166xx-176x +0.101x
Ed -1716 .68 + 11 .68 x - 29.9x 2 -126.5x, + 3.11x~x, - 8.13 xx,
2.28x 2x, + 7.72x2+1.43x'+5.22x (3)
[0090]
[0091] where, xl, x2 and x3 correspond to a, p and D, respectively; Ed, is a dewatering rate, %; Edo is a deoiling rate, %.
[0092] The establishment of a quadratic regression model and analysis of variance are shown in Table 2 and Table 3. It can be seen from the table that the F-values of the model are 11.74 and 4.61, respectively, and the p-values corresponding to the F-values are 0.19 % and 2.81 %, which are both less than 5 %. The complex correlation coefficient values R 2 of the two models are 0.9379 and 0.8557, respectively, indicating that the models are both highly significant.
[0093] Table 2: Analysis of variance of an optimization model of a dewatering rate
[0094] Source SS DF MS F-value p-value Model 3.02 9 0.34 11.74 0.0019 A- a 0.18 1 0.18 6.13 0.0425 B- 0 0.81 1 0.81 28.33 0.0011 C-D 0.08 1 0.08 2.94 0.1299 AB 0.64 1 0.64 22.32 0.0021 AC 0.28 1 0.28 9.76 0.0168 BC 0.11 1 0.11 3.86 0.0903 2 A 0.82 1 0.82 28.53 0.0011 2 B 0.04 1 0.04 1.50 0.2613 C2 0.06 1 0.06 2.17 0.1846
Residual 0.20 7 0.03 -
LackofFit 0.20 3 0.07 -
[0095] Pure Error 0 4 0 -
Cor Total 3.22 16 - -
R2 0.9379 -
[0096] Table 3: Analysis of variance of an optimization model of a deoiling rate
[0097] Source SS DF MS F-value p-value Model 404.13 9 44.90 4.61 0.0281 A-a 155.41 1 155.41 15.96 0.0052 B-B 1.70 1 1.70 0.17 0.6887 C-D 0.84 1 0.84 0.09 0.7777 AB 9.70 1 9.70 1.00 0.3515 AC 66.18 1 66.18 6.80 0.0351 BC 20.74 1 20.74 2.13 0.1879 A2 15.70 1 15.70 1.61 0.2449 B2 8.63 1 8.63 0.89 0.3778 c- 114.88 1 114.888 11.80 0.0109 Residual 68.17 7 9.74 Lack of Fit 68.17 3 22.72 Pure Error 0 4 0 Cor Total 472.3018 16 R2 0.8557
[0098] In the table, Source represents the source of variance. SS represents the sum of squared deviations. DF represents the degree of freedom. MS represents the mean square. Fvalue represents the F value of a F test statistic. p-value represents the P value of the F test statistic. Model means model. A-u means the small cone angle u, which is indicated by variable A. B-P means the large cone angle P, which is indicated by variable B. C-D means the nominal diameter D, which is indicated by variable C. AB means the product of the variable A and the variable B. AC means the product of the variable A and the variable C. BC represents the product of the 2 variable B and the variable C. A 2 represents the product of the variable A and the variable A. B represents the product of the variable B and the variable B. C 2 represents the product of the variable C and the variable C. Residual represents the residual error. Lack of Fit represents the lack of fit term. PureError represents an error. Cor Total means total regression. R2 means correlation coefficient value. Coded means code. Dewatering rate means the dewatering rate. Deoiling rate means the deoiling rate.
[0099] In order to further study the influence of interaction between various factors on the separation efficiency, it is necessary to analyze the quadratic regression model, and an obtained response contour map is shown in FIGS. 6 and 7. FIG. 6 shows the influence of interaction between the large cone angle and the small cone angle on the dewatering rate. It can be seen from FIG. 6 that reducing the small cone angle c and the large cone angle P at the same time can improve the dewatering rate of the overflow port of the device to a smaller extent. And when the small cone angle is 5 0, the large cone angle decreases from 22 ° to 20 °, and the dewatering rate increases from 95.03 % to 96.24 %. FIG. 7 is the influence of interaction between a small cone angle and a nominal diameter on a deoiling rate. In FIG. 7, increasing the nominal diameter D and reducing the small cone angle c at the same time can significantly increase the deoiling rate of the underflow port. And when the small cone angle is 5 0, the nominal diameter D increases from 20 mm to 22 mm, and the deoiling rate increases from 90.69 % to 94.16 %.
[0100] Optimal combination of operating parameters: the dewatering rate and the deoiling rate of the device that reach the maximum value at the same time are taken as the optimal condition. The optimization result is obtained by solving and analyzing the model. The results show that the optimal values of the small cone angle, the large cone angle and the nominal diameter are 5.09 0,
20 and 22 mm, and the numerical calculation values of the dewatering rate and the deoiling rate 0
of the coupled device under these conditions are 96.46%, and 97.05%, respectively.
[0101] The forgoing embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or alterations made by the person skilled in the art on the basis of the present invention are all within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to claims.
Claims (10)
1. A dual-field coupled dewatering device, characterized by comprising an overflow pipe, an inlet, a straight pipe section, a large cone section, a small cone section and an underflow pipe; wherein the overflow pipe and the inlet are arranged on the straight pipe section, the inlet is arranged on the outer wall of the straight pipe section, the inlet is arranged tangentially to the pipe wall of the straight pipe section so as to be suitable for a liquid flow to enter the straight pipe section at a certain speed and to be able to be rotationally flowed along the inner wall of the straight pipe section; the overflow pipe is arranged along an axial direction of the straight pipe section; the overflow pipe is located between the outer wall of the straight pipe section and the inner wall of the straight pipe section and arranged as a high-voltage electric field; the other side of the straight pipe section is connected to the large cone section, the other side of the large cone section is connected to the small cone section, and the other side of the small cone section is connected to the underflow pipe.
2. The dual-field coupled dewatering device according to Claim 1, characterized in that the outer wall of the overflow pipe is provided with a positive electrode of a high-voltage power supply, the inner wall of the straight pipe section is provided with a negative electrode of the high-voltage power supply, so as to be suitable for forming a high-voltage electric field in a region between the outer wall of the overflow pipe and the inner wall of the straight pipe section.
3. The dual-field coupled dewatering device according to Claim 1, characterized in that at least two inlets are symmetrically rotationally arranged on the straight pipe section.
4. The dual-field coupled dewatering device according to Claim 1, characterized in that the straight pipe section, the large cone section, the small cone section, and the underflow pipe are connected as a whole by welding, and the overflow pipe and the straight pipe are connected by a bolt.
5. The dual-field coupled dewatering device according to Claim 1, characterized in that a nominal diameter D at a junction of the large cone section and the small cone section is 20 mm 22 mm; the large cone section has 20°-22° of a large cone angle P; the small cone section has 5 °-6 ° of a small cone angle u.
6. A method for optimizing parameters of a dual-field coupled dewatering device, comprising the following steps of: determining the parameters to be optimized; simulating the dual-field coupled dewatering device one by one according to the parameters to be optimized; determining the optimal value range of each parameter to be optimized according to simulation results; determining the optimized parameter combination of each parameter to be optimized; simulating the dual-field coupled dewatering device one by one according to the optimized parameter combination; obtaining the separation efficiency of the dual-field coupled dewatering device under different optimized parameter combinations; and determining the optimal optimized parameter combinations according to the separation efficiency.
7. The method for optimizing the parameters of the dual-field coupled dewatering device according to Claim 6, characterized in that the optimal optimized parameter combination is realized according to the following steps: establishing a functional relationship between each optimized parameter combination and the separation efficiency; analyzing the significance of an optimized parameter combination model through the functionalrelationship; determining whether the optimized parameter combination meets requirements according to the results of significance analysis, if not, return to the previous step for the significance analysis; if so, determining the optimized parameter combination; analyzing the influence of interaction between the optimized parameter combinations on the separation efficiency; and determining the optimal optimized parameter combinations.
8. The parameter optimization method of the dual-field coupled dewatering device according to Claim 6, characterized in that the parameters to be optimized of the dual-field coupled dewatering device include a nominal diameter D, a large cone angle , and a small cone angle a.
9. The method for optimizing the parameters of the dual-field coupled dewatering device according to claim 6, characterized in that the nominal diameter D of a junction between the large cone section and the small cone section is 20 mm - 22 mm; the large cone section has 20 °-22 0 of the large cone angle p; the small cone section has 5 °-6 ° of the small cone angle a.
10. The method for optimizing the parameters of the dual-field coupled dewatering device according to Claim 6, characterized in that the functional relationship between each optimized parameter combination and the separation efficiency is established and calculated according to the following formula:
Edw = 266.26 - 8.798 x -12.43 x2 197x 3 + 0.799 xx 2 + 0.528 xx 3
+0.166xx 3 -I.76x+0.10IxI-0.12x E, = 1716.68 + 11.68x, -29.9x,-126.5x +3.llxx -8.13xx,
-2.28x 2x 3 +7.72x2 +1.43x2 +5.22x wherein, xl, x2 and x3 correspond to a, P and D, respectively; Ed, is a dewatering rate, %; Edo is a deoiling rate, %; It is the optimal condition that the dewatering rate and the deoiling rate of the device reach the maximum value at the same time; The optimal optimized parameter combination is obtained.
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