CN114534317B - Real-time feedback segmentation method for multi-frequency microwave detection of laminar oil-water two-phase flow - Google Patents
Real-time feedback segmentation method for multi-frequency microwave detection of laminar oil-water two-phase flow Download PDFInfo
- Publication number
- CN114534317B CN114534317B CN202210159592.6A CN202210159592A CN114534317B CN 114534317 B CN114534317 B CN 114534317B CN 202210159592 A CN202210159592 A CN 202210159592A CN 114534317 B CN114534317 B CN 114534317B
- Authority
- CN
- China
- Prior art keywords
- water
- water content
- oil
- layer
- dividing mechanism
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- B01D17/12—Auxiliary equipment particularly adapted for use with liquid-separating apparatus, e.g. control circuits
-
- 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
- B01D17/0208—Separation of non-miscible liquids by sedimentation
- B01D17/0214—Separation of non-miscible liquids by sedimentation with removal of one of the phases
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
- G06F17/18—Complex mathematical operations for evaluating statistical data, e.g. average values, frequency distributions, probability functions, regression analysis
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Data Mining & Analysis (AREA)
- Mathematical Physics (AREA)
- Mathematical Optimization (AREA)
- Theoretical Computer Science (AREA)
- Thermal Sciences (AREA)
- Computational Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Pure & Applied Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Mathematical Analysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Operations Research (AREA)
- Probability & Statistics with Applications (AREA)
- Evolutionary Biology (AREA)
- Algebra (AREA)
- Bioinformatics & Computational Biology (AREA)
- Databases & Information Systems (AREA)
- Software Systems (AREA)
- General Engineering & Computer Science (AREA)
- Bioinformatics & Cheminformatics (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention relates to a multi-frequency microwave detection real-time feedback segmentation method for a laminar flow oil-water two-phase flow, which belongs to the field of oil-water separation. The method comprises the following steps: the detection mechanism is used for respectively detecting the water content of the oil layer and the water layer; according to the water content of the oil layer and the water layer, the processor calculates the moving direction, the moving speed and the moving time of the dividing mechanism and generates a control signal; according to the control signal, the controller controls the dividing mechanism to move so as to adjust the dividing position of the dividing mechanism; and (5) oil-water separation is carried out on the oil layer and the water layer by utilizing the adjusted dividing mechanism. The method can enable the moving and adjusting dividing mechanism to accurately separate oil from water from the boundary between the oil layer and the water layer, and can improve the oil-water separation precision, thereby effectively improving the separation effect and the separation efficiency.
Description
Technical Field
The invention relates to the technical field of oil-water separation, in particular to a multi-frequency real-time feedback segmentation method for multi-frequency microwave detection of a laminar oil-water two-phase flow.
Background
Aged oils are complex water-in-oil, oil-in-water emulsions containing chemical additives and other impurities produced in crude oil storage, sludge and sewage treatment. Aged oil has many disadvantages, such as strong corrosiveness, resulting in shortened crude oil processing unit life; the electric conductivity is strong, and the tripping of an electric dehydrator of a crude oil treatment system can be caused; the stability is strong, can occupy great space in the crude oil processing unit. Also, aging the oil increases the cost of the process. Therefore, oil-water separation is necessary and an effective means for solving the problem of aged oil.
A laminar oil-water two-phase flow is a fluid that contains oil-water two-phase material and that is stratified in oil-water. At present, the aim of oil-water separation is to separate the laminar oil-water two-phase flow from the boundary position of the oil layer and the water layer as efficiently and accurately as possible. However, the existing oil-water separation method cannot adjust the separation position of the divider in real time along with the height change of the oil-water boundary, so that the divider cannot divide oil and water along the oil-water boundary, and therefore, the separation efficiency is low and the effect is poor.
Disclosure of Invention
The invention aims to provide a multi-frequency real-time feedback segmentation method for laminar oil-water two-phase flow by microwave detection, so as to improve the separation effect and efficiency of laminar oil-water and solve the problems of low separation efficiency and poor effect caused by the fact that a divider cannot be adjusted in real time along with the height change of an oil-water boundary in the existing oil-water separation method.
In order to achieve the above object, the present invention provides the following solutions:
the utility model provides a laminar flow profit two-phase flow multifrequency microwave detection real-time feedback segmentation method, the method is applied to in the profit decollator, the profit decollator includes detection mechanism, segmentation mechanism, controller and treater, the method includes:
the detection mechanism is used for respectively detecting the water content of the oil layer and the water layer;
according to the water content of the oil layer and the water layer, the processor calculates the moving direction, the moving speed and the moving time of the dividing mechanism and generates a control signal;
according to the control signal, the controller controls the dividing mechanism to move so as to adjust the dividing position of the dividing mechanism;
and (5) oil-water separation is carried out on the oil layer and the water layer by utilizing the adjusted dividing mechanism.
Optionally, the processor calculates a moving direction, a moving speed and a moving time of the dividing mechanism according to the water content of the oil layer and the water layer, and generates a control signal, which specifically includes:
setting a target water content;
determining the moving direction of the dividing mechanism according to the size relation between the water content of the oil layer and the target water content;
calculating the moving speed of the dividing mechanism according to the water content of the oil layer and the water layer;
calculating the moving time of the dividing mechanism according to the water content of the oil layer and the water layer;
and generating a control signal according to the moving direction, the moving speed and the moving time of the dividing mechanism.
Optionally, the determining the moving direction of the dividing mechanism according to the magnitude relation between the water content of the oil layer and the target water content specifically includes:
respectively calculating the average water content of the oil layer and the average water content of the water layer according to the water content of the oil layer and the water layer;
when the average water content of the oil layer is greater than or equal to the target water content, the dividing mechanism is judged to move upwards;
when the average water content of the oil layer is smaller than the target water content, it is determined that the dividing mechanism moves downward.
Optionally, the calculating the moving rate of the dividing mechanism according to the water content of the oil layer and the water content of the water layer specifically includes:
calculating the difference between the average water content of the oil layer and the average water content of the water layer to obtain the phase difference water content;
and calculating the moving speed of the dividing mechanism according to the phase difference water content.
Optionally, the calculating the movement rate of the dividing mechanism according to the phase difference water content specifically includes:
with v=v 0 Calculating the moving speed of the dividing mechanism;
wherein V represents the moving speed of the dividing mechanism, V 0 Represents the base movement rate, WC represents the phase difference water content, and wc=wp-Cp, cp represents the average water content of the oil layer, wp represents the average water content of the water layer.
Optionally, the calculating the moving time of the dividing mechanism according to the water content of the oil layer and the water content of the water layer specifically includes:
calculating a moving time constant according to the water content of the oil layer and the water layer;
and calculating the moving time of the dividing mechanism according to the moving time constant.
Optionally, the calculating the moving time constant according to the water content of the oil layer and the water layer specifically includes:
by using
Calculating an upward movement time constant;
by using
Calculating a downshifting time constant;
wherein αw represents an upward shift time constant, and αc represents a downward shift time constant; w1, W2 and W3 are respectively the water content data corresponding to three different heights in the detected water layer, the heights corresponding to W1, W2 and W3 are sequentially increased, C1, C2 and C3 are respectively the water content data corresponding to three different heights in the detected oil layer, and the heights corresponding to C1, C2 and C3 are sequentially increased.
Optionally, the calculating, according to the moving time constant, the moving time of the dividing mechanism specifically includes:
by using
Calculating the upward movement time of the dividing mechanism;
wherein T is W The upward movement time of the dividing mechanism is represented, T0 represents the basic movement time, and αw represents the upward movement time constant;
by using
Calculating the downward movement time of the dividing mechanism;
wherein T is C The downshifting time of the dividing mechanism is shown, and αc is the downshifting time constant.
Optionally, the dividing mechanism is of a hollow structure, and a cavity is formed in the dividing mechanism;
the detection mechanisms are respectively arranged at the upper side and the lower side outside the cavity;
the controller and the processor are disposed within the cavity.
Optionally, the dividing mechanism is a tongue-shaped structure; the tongue tip of the tongue structure is used for dividing an oil layer and a water layer.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention provides a multi-frequency microwave detection real-time feedback segmentation method for a laminar flow oil-water two-phase flow, which integrates a detection device and a separation device of an oil-water mixture, and when a segmentation mechanism is used for oil-water segmentation, the detection mechanism is used for detecting the water content of an oil layer and a water layer which are currently being separated in real time, and the movement direction, the movement speed and the movement time of the segmentation mechanism are calculated, so that the efficient and accurate segmentation of the current laminar flow oil-water two-phase flow is judged, and the corresponding adjustment strategy of the segmentation mechanism, namely whether the segmentation mechanism should move upwards or downwards and the movement speed and time of the segmentation mechanism, can further ensure that the segmentation mechanism after the movement adjustment can accurately separate oil from the boundary of the oil layer and the water layer, and can improve the oil-water separation precision, thereby effectively improving the separation effect and the separation efficiency.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. The following drawings are not intended to be drawn to scale, emphasis instead being placed upon illustrating the principles of the invention.
FIG. 1 is a flow chart of a multi-frequency microwave detection real-time feedback segmentation method for a laminar oil-water two-phase flow provided in embodiment 1 of the present invention;
fig. 2 is a schematic diagram of a multi-frequency microwave detection real-time feedback segmentation method for a laminar oil-water two-phase flow provided in embodiment 1 of the present invention;
fig. 3 is a schematic structural diagram of an oil-water separator according to embodiment 1 of the present invention;
fig. 4 is an axial view in the a-direction of the oil-water separator provided in embodiment 1 of the present invention;
FIG. 5 is a flowchart illustrating the operation of the multi-frequency microwave detector according to embodiment 1 of the present invention;
fig. 6 is a flowchart of the operation of the microwave signal arithmetic unit according to embodiment 1 of the present invention;
fig. 7 is a schematic diagram of the operation of the multi-frequency microwave detector and the microwave signal arithmetic unit according to embodiment 1 of the present invention.
Reference numerals illustrate:
1-an oil-water separator; 2-rectangular pipes; 3-a first moisture content detector; 4-a second water content detector; a 5-processor; 6-a controller; 7-a transmission mechanism; 8-rectangular pipeline partition plates; 9-a dividing mechanism; 901-lingual tip; 902-mid lingual portion; 903-lingual end; 10-cavity; 11-frequency modulator; 12-a microwave generator; 13-a variable attenuator; 14-a detection mechanism; 15-a signal amplifier; a 16-means operator; 17-time constant operator.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As used in the specification and in the claims, the terms "a," "an," "the," and/or "the" are not specific to a singular, but may include a plurality, unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" merely indicate that the steps and elements are explicitly identified, and they do not constitute an exclusive list, as other steps or elements may be included in a method or apparatus.
Although the present invention makes various references to certain modules in a system according to embodiments of the present invention, any number of different modules may be used and run on a user terminal and/or server. The modules are merely illustrative, and different aspects of the systems and methods may use different modules.
A flowchart is used in the present invention to describe the operations performed by a system according to embodiments of the present invention. It should be understood that the preceding or following operations are not necessarily performed in order precisely. Rather, the various steps may be processed in reverse order or simultaneously, as desired. Also, other operations may be added to or removed from these processes.
The invention aims to provide a multi-frequency real-time feedback segmentation method for laminar oil-water two-phase flow by microwave detection, so as to improve the separation effect and efficiency of laminar oil-water and solve the problems of low separation efficiency and poor effect caused by the fact that a divider cannot be adjusted in real time along with the height change of an oil-water boundary in the existing oil-water separation method.
Laminar flow: a fluid flow state which is laminar. Laminar flow in the present invention refers to the flow state of a fluid where the oil layer and the water layer are significantly layered.
Two-phase flow: a two-phase material (at least one phase is a fluid). If the phase states of the materials in the flow system are more than two, then this is called multiphase flow, and two or more phases are the most common viscous fluid flows involved in chemical production to accomplish the phase-by-phase mass transfer and reaction processes. The two-phase flow refers to a fluid composed of oil-water two-phase substances.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Example 1
As shown in fig. 1 and 2, the present embodiment provides a multi-frequency microwave detection real-time feedback splitting method for a laminar flow oil-water two-phase flow, which is applied to an oil-water splitter 1, fig. 3 is a schematic structural diagram of the oil-water splitter 1, fig. 4 is an axial view of the oil-water splitter 1 in the a direction, and as shown in fig. 3 and 4, the oil-water splitter 1 in the present embodiment includes a detection mechanism 14, a splitting mechanism 9, a controller 6 and a processor 5. And the detection mechanism 14, the processor 5, the controller 6 and the dividing mechanism 9 are electrically connected in sequence.
In this embodiment, the dividing mechanism 9 is configured to divide a laminar flow of oil-water two-phase flow into an oil layer and a water layer, and the divided oil layer and water layer respectively flow into fluid channels on the upper and lower sides of the dividing mechanism 9.
The dividing mechanism 9 may be a hollow structure, and a cavity 10 is formed in the dividing mechanism; the detection mechanisms 14 are respectively arranged at the upper side and the lower side outside the cavity 10; the controller 6 and the processor 5 are arranged in the cavity 10. By providing the dividing mechanism 9 with the cavity 10, the cavity 10 can provide space for arranging the processor 5 and the controller 6, so that the whole device is more convenient and stable to use. The cavity 10 is also effective in preventing the electronic components and circuits such as the processor 5 and the controller 6 from being impacted and corroded by external oil-water fluid.
In this embodiment, the dividing mechanism 9 may adopt a tongue-shaped structure including a tongue tip 901, a tongue middle 902, and a tongue end 903. Wherein the tongue tip 901, the tongue middle part 902 and the tongue tail 903 are of an integral structure, and the cavity 10 is formed inside. The tongue tip 901 is used for dividing an oil layer and a water layer, and the oil layer and the water layer of the laminar flow oil-water two-phase flow are separated from the tongue tip 901 and respectively flow through fluid channels on the upper side and the lower side of the tongue middle part 902. In this embodiment, the tongue structure is combined with the hollow structure to form a hollow tongue structure, and the structure is shown in fig. 2.
In general, the oil-water separator 1 may be installed in a rectangular pipe 2, and the end of the oil-water separator 1 is connected with a rectangular pipe partition 8 long enough to make the separating mechanism 9 cooperate with the rectangular pipe 2 and the rectangular pipe partition 8 to separate the rectangular pipe 2 into two independent fluid channels, because the densities of oil and water are different, generally laminar oil-water will be obviously layered and the oil layer will be located above the water layer, and the laminar oil-water two-phase flow flows through the rectangular pipe 2 and reaches the oil-water separator 1 to perform oil-water separation, and the separated oil layer and water layer respectively flow into the two independent fluid channels.
The present invention is not limited to the shape of the dividing mechanism 9 and the shape of the pipe, and the pipe may be a rectangular pipe 2 or a circular pipe, and the shape of the dividing mechanism 9 may be selected by itself according to the actual pipe shape, so long as it is ensured that the pipe can be divided into two fluid passages.
The method for multi-frequency microwave detection real-time feedback segmentation of laminar oil-water two-phase flow provided by the embodiment, as shown in fig. 1, specifically comprises the following steps:
in step S1, the detection means 14 detects the water content of the oil layer and the water layer, respectively.
After the oil-water separation is started, the laminar oil-water two-phase flow enters the oil-water separator 1, and the position of the boundary line between the oil layer and the water layer is always changed due to the flow rate of the laminar oil-water two-phase flow in the pipeline, the oil-water mixing condition and other factors, at this time, the oil-water separator 1 may not be aligned with the boundary line between the oil layer and the water layer, and if the separation position of the oil-water separator 1 cannot be adjusted in real time along with the boundary line, the separation effect will be poor.
The invention aims to respectively detect the water content of an oil layer and a water layer after segmentation, takes the index of the water content of the oil layer and the water layer as real-time feedback, adjusts the segmentation position of the oil-water separator 1 according to the relation between the actually detected water content of the oil layer and the water layer and the preset target water content, controls the oil-water separator 1 to move along the upward or downward direction and the calculated moving speed and moving time so as to align the boundary between the oil layer and the water layer as much as possible, and then utilizes the oil-water separator 1 after the segmentation position is adjusted to carry out oil-water segmentation on laminar flow oil-water two-phase flow, and can respond timely and quickly to the change of the boundary between the oil and the water, and immediately detect and make adjustment. The real-time detection of the water content and the adjustment of the dividing position of the oil-water divider 1 are continuously performed until the laminar oil-water two-phase flow is divided, so that the oil-water divider 1 can accurately and efficiently separate oil from water all the time, and the dividing effect and efficiency can be effectively improved.
In this embodiment, the detection mechanism 14 is a multi-frequency microwave detector, which is mainly used for detecting the water content of the oil layer and the water layer in a manner of transmitting microwave signals with various different frequencies, and the processor 5 is a microwave signal arithmetic unit, which is mainly used for calculating the water content data, determining the movement strategy of the dividing mechanism 9, and generating corresponding control signals.
Wherein the multi-frequency microwave detector comprises a first water content detector 3 and a second water content detector 4; the first water content detector 3 and the second water content detector 4 are respectively arranged on the upper side and the lower side of the dividing mechanism 9, the first water content detector 3 is used for detecting the water content of an oil layer at the dividing position, and the second water content detector 4 is used for detecting the water content of a water layer at the dividing position.
As shown in fig. 4, the first water content detector 3 and the second water content detector 4 have two parts, which are a transmitting end and a receiving end, respectively, and are used for transmitting microwave signals and receiving microwave signals, respectively, and real-time detection of the water content of the separated oil layer and water layer is realized according to the transmitted and received microwave signals.
The multi-frequency microwave detector emits microwaves with various frequencies at different heights of the detected medium to detect the water content of the detected medium, in this embodiment, the multi-frequency microwave detector can emit microwaves with 3 different frequencies at different heights of the detected medium, for example, microwaves with frequencies of 22.85GHz, 28.57GHz and 34.28GHz are emitted at heights of 0.5cm, 1.0cm and 1.5cm of the detected medium respectively, the water content values at 3 detection points with different heights in an oil layer or a water layer can be detected, then the average water content is obtained by averaging the water content values, and the average water content is used as the final water content result of the current oil layer and the water layer to improve the accuracy of oil-water separation.
In this embodiment, in order to detect the water content of different heights in the oil layer and the water layer, inclined planes inclined by a preset angle are set between the upper and lower sides of the tongue tip 901 and the tongue middle 902, the first water content detector 3 and the second water content detector 4 are respectively installed on the inclined planes of the upper and lower sides of the dividing mechanism 9, so that the first water content detector 3 and the second water content detector 4 are obliquely arranged, and the transmitting end and the receiving end on the first water content detector 3 and the second water content detector 4 are obliquely arranged, so that the transmitting end and the receiving end can transmit and receive microwaves at 3 detection positions of different heights by using the height difference generated by the inclination, and the condition that microwaves of 3 different frequencies are transmitted at different heights in the oil layer or the water layer can be satisfied, so that the water content detection is performed at the 3 detection positions of different heights. Wherein, 3 electrical signals of water content detected by the first water content detector 3 are C1, C2 and C3, and average value is taken to obtain average water content Cp of the oil layer; the 3 electrical signals of water content detected by the second water content detector 4 are W1, W2 and W3, and the average water content Wp of the water layer is obtained by taking an average value.
As shown in fig. 5, the detection flow of the multi-frequency microwave detector of the present invention is as follows: the microwave generator 12 is subjected to frequency modulation through the frequency modulator 11, microwave with certain frequency is emitted, microwave with certain intensity is obtained through the variable attenuator 13, then the microwave signal is divided into two paths, one path of microwave signal passes through a tested medium and then enters the multi-frequency microwave detector; the other path of microwave signal is used as a reference value to directly enter the multi-frequency microwave detector. Then the multi-frequency microwave detector outputs the detection signal to the signal amplifier 15, the amplified electric signal is sent to the microwave signal arithmetic unit, and the water content signal is obtained after calculation by the microwave signal arithmetic unit. The structures such as the frequency modulator 11, the microwave generator 12, the variable attenuator 13, the signal amplifier 15, etc. are disposed in the multi-frequency microwave detector, the connection manner is shown in fig. 5, and the working manner and the working principle of each structure are the same as those of the prior art, and are not described herein again.
Aiming at the complex laminar flow oil-water two-phase flow fluid such as crude oil, aging oil and the like, the invention utilizes the microwave attenuation caused by water in the measured oil to realize the detection of the water content of the fluid. Dielectric relaxation of water molecules at microwave frequencies causes severe attenuation of electromagnetic waves of certain frequencies.
The propagation of plane electromagnetic waves in a medium can be expressed by the formulas (1), (2):
E＝E 0 e -αx ·e i2π(vt-βx/2π) (1)
B＝B 0 e -αx ·e i2π(vt-βx/2π) (2)
wherein E, B represent electric field and magnetic field respectively; x and t respectively represent the transmission direction and the travel time of electromagnetic waves; v represents the frequency of electromagnetic waves; t represents a time period, the spatial period being λ=2pi/β; e, e -αx Representing an electromagnetic wave attenuation factor; i is an imaginary unit; e (E) 0 An electric field at t=0, B 0 A magnetic field at t=0.
The attenuation factor α is a function of the dielectric and magnetic properties of the propagating material at a certain microwave frequency. Assuming that there is no magnetic loss in the propagation material, the attenuation coefficient is expressed as formula (3):
wherein lambda is 0 The wavelength in air is represented by K1, which is the relative dielectric constant, and K2, which is the relative attenuation coefficient.
Wherein the parameters K1 and K2 depend on a number of factors such as the frequency of the wave, the temperature and the material composition of the propagation material. The K1 and K2 values of hydrocarbons in crude oil are lower compared to water. For example, at a microwave wavelength of 1cm, most crude oils have a K2 value of less than 0.05 for hydrocarbons and water has a K2 value of greater than 30, and therefore the present invention uses the degree of attenuation of microwaves in an oil-water mixture to characterize water content.
In this embodiment, assuming that h is the total path of the microwave beam, the microwave is started from the initial value Q 0 The microwave attenuation to the actual detection value Q of the microwave can be expressed by the formula (4):
wherein h is w The length of the microwave in water is expressed as formula (5):
h w ＝h O ·η (5)
wherein h is O Indicating microwaves in oilLength, η is the ratio of water to oil.
Then there are:
for the multi-frequency microwave detector of the present invention, it is necessary to add a multi-frequency phase shift correction coefficient X, which is determined experimentally, so that the ratio of water to oil is corrected as formula (8):
wherein η represents the ratio of water to oil; alpha represents the attenuation coefficient of the microwave in the medium; h is a O Representing the propagation length of microwaves in the oil; x represents a multi-frequency phase shift correction coefficient; q (Q) 0 Representing a microwave reference intensity; q represents the microwave measurement intensity.
In this embodiment, the microwave signal arithmetic unit receives the microwave electric signal including the water content of the oil layer and the water layer sent by the multi-frequency microwave detector, where the microwave electric signal is the ratio of the measured intensity of the microwave passing medium to the reference intensity. After receiving the microwave electric signal, the microwave signal arithmetic unit calculates and outputs the ratio eta of water and oil.
Step S2, the processor 5 calculates the moving direction, the moving speed and the moving time of the dividing mechanism 9 according to the water content of the oil layer and the water layer, and generates a control signal. The method specifically comprises the following steps:
and S2.1, setting a target water content.
Step S2.2, determining the moving direction of the dividing mechanism 9 according to the magnitude relation between the water content of the oil layer and the target water content. The method specifically comprises the following steps:
step S2.2.1, calculating the average water content of the oil layer and the average water content of the water layer according to the water content of the oil layer and the water layer.
Step S2.2.2, when the average water content of the oil layer is equal to or higher than the target water content, it is determined that the dividing mechanism 9 is moved upward.
And S2.2.3, when the average water content of the oil layer is smaller than the target water content, determining that the dividing mechanism 9 moves downwards.
Step S2.3, calculating the moving speed of the dividing mechanism 9 according to the water content of the oil layer and the water layer. The method specifically comprises the following steps:
and S2.3.1, calculating the difference between the average water content of the oil layer and the average water content of the water layer to obtain the phase difference water content.
Step S2.3.2, calculating the movement rate of the dividing mechanism 9 according to the phase difference water content.
Calculating the movement rate of the dividing mechanism 9 using formula (9):
V＝V 0 ·(1-WC) (9)
wherein V represents the moving speed of the dividing mechanism 9, V 0 Represents the base movement rate, WC represents the phase difference water content, and wc=wp-Cp, cp represents the average water content of the oil layer, wp represents the average water content of the water layer.
Step S2.4, calculating the moving time of the dividing mechanism 9 according to the water content of the oil layer and the water layer. The method specifically comprises the following steps:
step S2.4.1, calculating a moving time constant according to the water content of the oil layer and the water layer.
Calculating the up-shift time constant using equation (10):
calculating a downshifting time constant using formula (11):
wherein αw represents an upward shift time constant, and αc represents a downward shift time constant; w1, W2 and W3 are respectively the water content data corresponding to three different heights in the detected water layer, the heights corresponding to W1, W2 and W3 are sequentially increased, C1, C2 and C3 are respectively the water content data corresponding to three different heights in the detected oil layer, and the heights corresponding to C1, C2 and C3 are sequentially increased.
Step S2.4.2, calculating the movement time of the dividing mechanism 9 based on the movement time constant.
Calculating the upward movement time of the dividing mechanism 9 by using the formula (12):
wherein T is W The upward movement time of the dividing mechanism 9, T0 represents the basic movement time, and αw represents the upward movement time constant;
calculating the downward movement time of the dividing mechanism 9 by using the formula (13):
wherein T is C The downward movement time of the dividing mechanism 9 is shown, and αc is the downward movement time constant.
Step S2.5, generating a control signal according to the movement direction, movement rate and movement time of the dividing mechanism 9.
In this embodiment, a microwave signal arithmetic unit is used as the processor 5, which has a mean arithmetic unit 16 and a time constant arithmetic unit 17 built therein, wherein the mean arithmetic unit 16 is used for calculating the average water content, and the time constant arithmetic unit 17 is used for calculating the up-shift time constant and the down-shift time constant, as shown in fig. 7.
Fig. 6 shows an operation flow chart of the microwave signal operator. As shown in fig. 6, after the flow starts, measurement data is first read, and the water content data C1, C2, C3 and W1, W2, W3 measured by the first water content detector 3 and the second water content detector 4, respectively, are input to the average value calculator 16, and then the average water content Cp of the oil layer and the average water content Wp of the water layer are calculated, and then a preset target water content C0 is input. Then, according to the magnitude relation between the average water content Cp of the oil layer and the target water content Wp, the moving direction, the moving speed and the moving time of the dividing mechanism 9 are judged, including the following two cases:
(1) When Cp is more than or equal to C0, an upward movement signal of the oil-water separator 1 is sent, the oil-water separator 1 (comprising a separation mechanism 9) moves upward, at the moment, a basic movement rate V0 is input, and the movement rate of the separation mechanism 9 is calculated to be V=V 0 (1-Wc). Wherein the phase difference water content is wc=wp-Cp, i.e., the difference in average water content detected by the first water content detector 3 and the second water content detector 4. The read measurement data W1, W2, W3 are inputted to a time constant operator 17, and an up-shift time constant alpha W is calculated,
then inputting basic movement time T0, calculating upward movement time Tw, & lt, & gt of the hollow tongue-shaped structure>
After the movement of the dividing mechanism 9 in the oil-water separator 1 reaches the upward movement time Tw, the movement is stopped, and the stop operation interval time is the input interval time Tb. The flow ends and then the entire flow is cycled.
(2) When Cp is smaller than C0, a downward movement signal of the oil-water separator 1 is sent, the oil-water separator 1 (comprising the separation mechanism 9) moves downwards, at the moment, a basic movement rate V0 is input, and the movement rate of the separation mechanism 9 is calculated to be V=V 0 (1-Wc). Wherein the phase difference water content is wc=wp-Cp. The measurement data C1, C2, C3 are read in, enter a time constant operator 17, calculate a downshifting time constant alpha C,
inputting the basic movement time T0, calculating the downward movement time Tc,/of the dividing mechanism 9>
After the movement of the dividing mechanism 9 in the oil-water separator 1 reaches the downward movement time Tc, the operation is stopped, and the stop operation interval time is the input interval time Tb. The flow ends and then the entire flow is cycled.
The invention adopts the multi-frequency microwave detection real-time feedback flow, and determines the up-and-down movement rate of the oil-water separator 1 according to the difference value of the average water contents of the oil layer and the water layer detected at the two sides of the oil-water separator 1, namely the phase difference water content WC. Meanwhile, the up-and-down moving time of the oil-water separator 1 is determined by utilizing the correlation functions of the water contents at different heights, so that the oil-water separator 1 can rapidly track the change of the boundary between an oil layer and a water layer, and the oil-water separation is performed accurately and efficiently, and has stronger robustness.
The basic principle of the invention is that the water layer mixed medium of the oil layer flowing in a laminar flow is used as the real-time feedback information to adjust the position of the dividing mechanism 9 in the oil-water divider 1 by the multi-frequency microwave detection method of the real-time feedback control when the oil-water divider 1 passes through, so that the dividing position of the tongue tip 901 of the dividing mechanism 9 is always aligned with the boundary between the oil layer and the water layer as much as possible, and at the moment, the efficient and accurate oil-water separation can be ensured, and the aim of dividing the oil layer with the corresponding water content according to the given target water content is fulfilled.
After the aged oil demulsifies, when the oil-water mixture is subjected to oil-water separation in a laminar flow state, the oil-water mixture is separated in real time only in the laminar flow state, and the method has the highest efficiency. If still adopting the method of standing, in the process of entering the standing container, the oil layer and the water layer are mixed again, thereby reducing the separation efficiency. Based on the method, the oil-water separator 1 is adopted, and the water content of the oil layer and the water layer in the flowing medium is detected in real time according to the multi-frequency microwave detectors on the two sides of the oil-water separator 1, so that the boundary between the oil layer and the water layer can be positioned in real time, the oil-water separator 1 is positioned near the boundary between the oil layer and the water layer, and the oil layer with the target water content is obtained through separation, so that the method has great significance in refining pure oil and purifying sewage.
It should be noted that, since the oil-water separator 1 mainly has the hollow tongue-shaped structure as the separating mechanism 9, the present invention adjusts the oil-water separator 1 to move, and mainly aims at the hollow tongue-shaped structure, so that the tongue tip 901 of the hollow tongue-shaped structure is aligned with the boundary line between the oil layer and the water layer as much as possible, preferably, the two are on the same straight line, therefore, the present invention adjusts the movement of the oil-water separator 1, and actually refers to the movement adjustment of the hollow tongue-shaped structure.
And step S3, according to the control signal, the controller 6 controls the dividing mechanism 9 to move so as to adjust the dividing position of the dividing mechanism 9.
In this embodiment, the oil-water separator 1 further includes a transmission mechanism 7, where the transmission mechanism 7 is fixedly connected with the tongue end 903 of the hollow tongue structure, specifically, is fixedly connected with the rotation axis of the tongue end 903, and the transmission mechanism 7 is further connected with the controller 6. The transmission mechanism 7 is used for receiving a control signal of the controller 6 and driving the dividing mechanism 9 to move up and down integrally. Thus, step S3 specifically includes:
and step S3.1, according to the control signal, the controller 6 controls the transmission mechanism 7 to move up and down.
And step S3.2, the transmission mechanism 7 drives the dividing mechanism 9 to move up and down, so that the dividing position of the dividing mechanism 9 is adjusted.
It should be noted that, in this embodiment, at the end of the transmission mechanism 7, a rectangular pipe partition 8 is further provided long enough along the direction of fluid flow, so that the oil layer and the water layer continue to flow along the fluid channel formed by the rectangular pipe partition 8 and the inner wall of the rectangular pipe 2 after being separated.
And S4, oil-water separation is carried out on the oil layer and the water layer by utilizing the adjusted dividing mechanism 9.
After the position of the dividing mechanism 9 is quickly adjusted according to the current water content data of the oil layer and the water layer, the oil layer and the water layer are immediately divided, the steps S1-S4 are repeatedly circulated, the change of the water content of the oil layer and the water layer is detected and fed back in real time, the change of the dividing line can be represented by the change of the water content of the oil layer and the water layer, and therefore the oil-water separator can respond to the change of the dividing line of the oil layer and the water layer in time, the adjusting strategy of the dividing mechanism 9 is quickly determined, and the moving action is completed.
In practical application, the laminar flow oil-water two-phase flow is split by the splitting mechanism 9 when flowing in the rectangular pipeline 2, and the upper oil layer passes through the first water content detector 3, then passes through the upper side fluid channel of the splitting mechanism 9, and then passes through the upper side of the rectangular pipeline partition plate 8, so as to be separated from the water layer. The lower water layer passes through the second water content detector 4, then passes through the lower fluid passage of the dividing mechanism 9, passes through the lower side of the rectangular pipe partition 8, and is separated from the oil layer. The oil-water separator 1 can rotate around the axis of the transmission mechanism 7 under the mechanical rotation of the transmission mechanism 7, so that the separation mechanism 9 swings up and down, and the up and down movement of the separation mechanism 9 is adjusted. Due to the change of up-and-down movement of the boundary line of the oil layer and the water layer entering the rectangular pipeline 2, the dividing position of the dividing mechanism 9 swings up and down, so that the tongue tip 901 of the dividing mechanism 9 is always positioned near the boundary line of the oil layer and the water layer, the purposes of quick feedback and accurate separation of laminar oil-water two-phase flow are achieved, the oil-water separation precision can be improved, and further the separation effect and the separation efficiency are effectively improved.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The foregoing is illustrative of the present invention and is not to be construed as limiting thereof. Although a few exemplary embodiments of this invention have been described, those skilled in the art will readily appreciate that many modifications are possible in the exemplary embodiments without materially departing from the novel teachings and advantages of this invention. Accordingly, all such modifications are intended to be included within the scope of this invention as defined in the following claims. It is to be understood that the foregoing is illustrative of the present invention and is not to be construed as limited to the specific embodiments disclosed, and that modifications to the disclosed embodiments, as well as other embodiments, are intended to be included within the scope of the appended claims. The invention is defined by the claims and their equivalents.
Claims (3)
1. The utility model provides a laminar flow profit two-phase flow multifrequency microwave detection real-time feedback segmentation method, the method is applied to in the profit decollator, the profit decollator includes detection mechanism, segmentation mechanism, controller and treater, its characterized in that, the method includes:
the detection mechanism is used for respectively detecting the water content of the oil layer and the water layer;
according to the water content of the oil layer and the water content of the water layer, the processor calculates the moving direction, the moving speed and the moving time of the dividing mechanism and generates a control signal, and the method comprises the following steps:
setting a target water content;
determining a moving direction of the dividing mechanism according to the magnitude relation between the water content of the oil layer and the target water content, wherein the method comprises the following steps:
respectively calculating the average water content of the oil layer and the average water content of the water layer according to the water content of the oil layer and the water layer;
when the average water content of the oil layer is greater than or equal to the target water content, the dividing mechanism is judged to move upwards;
when the average water content of the oil layer is smaller than the target water content, the dividing mechanism is judged to move downwards;
calculating the moving speed of the dividing mechanism according to the water content of the oil layer and the water layer, comprising:
calculating the difference between the average water content of the oil layer and the average water content of the water layer to obtain the phase difference water content;
calculating the movement rate of the dividing mechanism according to the phase difference water content;
with v=v 0 Calculating the moving speed of the dividing mechanism;
wherein V represents the moving speed of the dividing mechanism, V 0 Represents a base moving rate, WC represents a phase difference water content, and wc=wp-Cp, cp represents an average water content of an oil layer, wp represents an average water content of a water layer;
calculating the moving time of the dividing mechanism according to the water content of the oil layer and the water layer, comprising:
calculating a moving time constant according to the water content of the oil layer and the water layer;
by using
Calculating an upward movement time constant;
by using
Calculating a downshifting time constant;
wherein αw represents an upward shift time constant, and αc represents a downward shift time constant; w1, W2 and W3 are respectively corresponding water content data of three different heights in the detected water layer, the heights corresponding to W1, W2 and W3 are sequentially increased, C1, C2 and C3 are respectively corresponding water content data of three different heights in the detected oil layer, and the heights corresponding to C1, C2 and C3 are sequentially increased;
according to the moving time constant, calculating the moving time of the dividing mechanism, including:
by using
Calculating the upward movement time of the dividing mechanism;
wherein T is W The upward movement time of the dividing mechanism is represented, T0 represents the basic movement time, and αw represents the upward movement time constant;
by using
Calculating the lower part of the dividing mechanismTime shifting;
wherein T is C The downward movement time of the dividing mechanism is represented, and αc represents the downward movement time constant;
generating a control signal according to the moving direction, the moving speed and the moving time of the dividing mechanism;
according to the control signal, the controller controls the dividing mechanism to move so as to adjust the dividing position of the dividing mechanism;
and (5) oil-water separation is carried out on the oil layer and the water layer by utilizing the adjusted dividing mechanism.
2. The method of claim 1, wherein the dividing mechanism is a hollow structure with a cavity formed therein;
the detection mechanisms are respectively arranged at the upper side and the lower side outside the cavity;
the controller and the processor are disposed within the cavity.
3. The method of claim 1, wherein the dividing mechanism is a tongue-type structure; the tongue tip of the tongue structure is used for dividing an oil layer and a water layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210159592.6A CN114534317B (en) | 2022-02-22 | 2022-02-22 | Real-time feedback segmentation method for multi-frequency microwave detection of laminar oil-water two-phase flow |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210159592.6A CN114534317B (en) | 2022-02-22 | 2022-02-22 | Real-time feedback segmentation method for multi-frequency microwave detection of laminar oil-water two-phase flow |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114534317A CN114534317A (en) | 2022-05-27 |
| CN114534317B true CN114534317B (en) | 2023-06-16 |
Family
ID=81677865
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210159592.6A Active CN114534317B (en) | 2022-02-22 | 2022-02-22 | Real-time feedback segmentation method for multi-frequency microwave detection of laminar oil-water two-phase flow |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114534317B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115902170B (en) * | 2022-10-31 | 2023-08-18 | 江苏麦赫物联网科技有限公司 | Multiphase flow state working condition analysis method and equipment |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2376074A (en) * | 2001-05-30 | 2002-12-04 | Schlumberger Holdings | Method and apparatus for estimating water conductivity of multiphase mixtures |
| CN102052952A (en) * | 2010-11-18 | 2011-05-11 | 陕西科技大学 | Oil-water interface measuring device of crude oil storage tank and measuring method thereof |
| CN102505931A (en) * | 2011-11-23 | 2012-06-20 | 西安思坦仪器股份有限公司 | Gas-liquid separating and oil-water-gas three-phase flow measuring device |
| US9114332B1 (en) * | 2012-07-23 | 2015-08-25 | Herbert Liu | Multiphase flow measurement apparatus utilizing phase separation |
| CN107935212A (en) * | 2017-11-03 | 2018-04-20 | 武汉工程大学 | Automatic oil-water separation method and device |
| CN108728158A (en) * | 2017-04-14 | 2018-11-02 | 中国海洋石油集团有限公司 | Wet crude separator and method and three phase separation equipment, free water removal equipment, electro-dewatering apparatus and settling tank |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3294804B2 (en) * | 1998-08-18 | 2002-06-24 | 明豊精機株式会社 | Oil-water separator and water purifier |
| JP2000283826A (en) * | 1999-03-31 | 2000-10-13 | Zeon Engineering Co Ltd | Method and apparatus for measuring interface position |
| US6927846B2 (en) * | 2003-07-25 | 2005-08-09 | Baker Hughes Incorporated | Real-time on-line sensing and control of emulsions in formation fluids |
| GB201209343D0 (en) * | 2012-05-25 | 2012-07-11 | Caltec Ltd | An idea to increase operating envelope of wx bulk oil-water seperator |
| CN205627186U (en) * | 2016-03-28 | 2016-10-12 | 浙江理工大学 | Intelligent oil -water separation tank deoiling device |
| CN107036680B (en) * | 2017-05-26 | 2023-09-01 | 盐城纳得自动化设备有限公司 | Method for precisely detecting oil-water interface by utilizing ultrasonic waves and auxiliary device thereof |
| CN108640320A (en) * | 2018-06-14 | 2018-10-12 | 惠州市俊康电子科技有限公司 | A kind of water treatment facilities |
| CN208617654U (en) * | 2018-07-20 | 2019-03-19 | 河池学院 | A kind of oil-water separation purification device with temperature control water supplement function |
| CN210001629U (en) * | 2019-04-16 | 2020-01-31 | 董玉亮 | Oil-water interface detection control device of catering oil-water separation equipment |
| JP6948739B1 (en) * | 2021-03-09 | 2021-10-13 | 石福金属興業株式会社 | Oil-water mixing and separating device for solvent extraction process |
| CN113680106B (en) * | 2021-10-25 | 2022-01-25 | 山东海吉雅环保设备有限公司 | Electron beam irradiation treatment process for aging oil |
-
2022
- 2022-02-22 CN CN202210159592.6A patent/CN114534317B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2376074A (en) * | 2001-05-30 | 2002-12-04 | Schlumberger Holdings | Method and apparatus for estimating water conductivity of multiphase mixtures |
| CN102052952A (en) * | 2010-11-18 | 2011-05-11 | 陕西科技大学 | Oil-water interface measuring device of crude oil storage tank and measuring method thereof |
| CN102505931A (en) * | 2011-11-23 | 2012-06-20 | 西安思坦仪器股份有限公司 | Gas-liquid separating and oil-water-gas three-phase flow measuring device |
| US9114332B1 (en) * | 2012-07-23 | 2015-08-25 | Herbert Liu | Multiphase flow measurement apparatus utilizing phase separation |
| CN108728158A (en) * | 2017-04-14 | 2018-11-02 | 中国海洋石油集团有限公司 | Wet crude separator and method and three phase separation equipment, free water removal equipment, electro-dewatering apparatus and settling tank |
| CN107935212A (en) * | 2017-11-03 | 2018-04-20 | 武汉工程大学 | Automatic oil-water separation method and device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114534317A (en) | 2022-05-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN114534317B (en) | Real-time feedback segmentation method for multi-frequency microwave detection of laminar oil-water two-phase flow | |
| Johns et al. | Miscible gas displacement of multicomponent oils | |
| CA2655407C (en) | High water cut well measurements using heuristic salinity determination | |
| Du et al. | Flow pattern and water holdup measurements of vertical upward oil–water two-phase flow in small diameter pipes | |
| Colosqui et al. | Droplet and slug formation in polymer electrolyte membrane fuel cell flow channels: The role of interfacial forces | |
| Trallero et al. | A study of oil/water flow patterns in horizontal pipes | |
| Paul et al. | Unexpectedly normal phase behavior of single homopolymer chains | |
| MacDowell et al. | Adsorption of polymers on a brush: Tuning the order of the wetting phase transition | |
| Krishna et al. | Flow regime transition in bubble columns | |
| Nakoryakov et al. | Study of local hydrodynamic characteristics of upward slug flow | |
| EP2638387A1 (en) | Separation of liquid components from a mixture | |
| US5625293A (en) | Determination of the watercut of a multiphase flow directly from measured microwave frequency dielectric properties | |
| US5107219A (en) | Means and method for determining the conductance of a fluid | |
| Trogus et al. | Adsorption of mixed surfactant systems | |
| Theofanous | Conceptual models of gas exchange | |
| Manning | On the application of polyelectrolyte limiting laws to the helix–coil transition of DNA. V. Ionic effects on renaturation kinetics | |
| Leibovici et al. | Method for delumping the results of compositional reservoir simulation | |
| Hodgson et al. | Viscometric titration of a linear polyelectrolyte | |
| CN104712539B (en) | Control process to save electrical energy consumption of a pump equipment | |
| Mortazavi et al. | Analysis of liquid-gas two-phase flow pressure drop signature in minichannels | |
| Shtepani et al. | New approach in gas injection miscible processes modelling in compositional simulation | |
| Macpherson et al. | Molecular dynamics of hard spheres. I. Hard spheres in a channel | |
| US9764258B2 (en) | Controlling froth flotation | |
| CN106404775B (en) | A kind of the Single wavelength autocontrol method and device of quick photometric titration | |
| CA2025075A1 (en) | Means and method for analyzing a petroleum stream |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |