CN102052951B - Measurement device and method for multi-phase interface liquid level based on dual-modality sensor - Google Patents
Measurement device and method for multi-phase interface liquid level based on dual-modality sensor Download PDFInfo
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- CN102052951B CN102052951B CN2010105424810A CN201010542481A CN102052951B CN 102052951 B CN102052951 B CN 102052951B CN 2010105424810 A CN2010105424810 A CN 2010105424810A CN 201010542481 A CN201010542481 A CN 201010542481A CN 102052951 B CN102052951 B CN 102052951B
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Abstract
The invention belongs to the technical field of multi-phase interface liquid level measurement and relates to a measurement device for a multi-phase interface liquid level based on a capacitance/resistance-type dual-modality sensor, which is used for measuring a liquid level of a multi-phase interface. The measurement device comprises an upper computer, a signal generation unit, a power amplifier, an analog multi-way switch, a capacitance/resistance-type dual-modality sensor and a signal collection unit. The invention is characterized in that the capacitance/resistance-type dual-modality sensor comprises an array of electrodes which are distributed in N rows and three columns on the same plane, and N is an integer larger than or equal to 3, wherein the electrodes in the first column and in the second column are all rectangular electrodes, the electrodes in the third column are round in shape, the size of the electrodes in the third column is smaller than that of the electrodes in the first column and in the second column, the electrodes in the same column are made of the same material and have the same size, and the distances between two electrodes in the same column are the same. The invention also provides a measurement method for measuring the multi-phase interface liquid level by use of the measurement device. The device has a simple and reliable structure, is convenient for installation, is not liable to be blocked by the viscose crude oil, and can achieve the accurate measurement of the liquid level of the multi-phase interface.
Description
Technical field
The invention belongs to multi phase interface level gauging technical field, relate to a kind of measuring system based on capacitance/resistance formula bimodal sensor.
Background technology
From oil well, directly contain big water gaging, silt and rock gas in the crude oil of extraction,, will in storage tank, form silt/water, water/oil, several kinds of interfaces of rock gas/wet goods through the separation of triphase separator.In order to measure the former oil mass in the storage tank, just must at first measure the last liquid level and following liquid level of crude oil in the storage tank.Obviously, in order to reach this purpose, need a kind of multinomial interface of design TT&C system.
At present, traditional capacitance type liquid level measuring system only can detect single interface location, when detecting the position of multi phase interface simultaneously, is to achieve the goal with pair of electrodes only.Utilize multielectrode sensor construction (adding list of references); Can distinguish gas/oil/water termination theoretically, but the water of direct extraction mainly is seawater from oil well, the conductance of seawater higher (can reach 5 west door/rice); Because the conduction short-circuiting effect of water; Its measurement capacitance is not directly proportional with the specific inductive capacity of water, often much smaller than theoretical value, therefore in reality, surveys the interface that electric capacity can't accurately be distinguished seawater/oil.
Summary of the invention
To above defective and the deficiency that prior art exists, a kind of measurement mechanism that utilizes capacitance/resistance formula bimodal sensor of the object of the invention proposition mentioned.The present invention utilizes capacitance measurement, can accurately differentiate gas/oily interface, and utilize resistance measurement, can accurately differentiate water/oily interface.The present invention adopts following technical scheme:
A kind of measurement mechanism of the multi phase interface liquid level based on capacitance/resistance formula bimodal sensor; Be used to measure the liquid level of multi phase interface; Comprise host computer, signal generating unit, power amplifier, analog multichannel switch, capacitance/resistance formula bimodal sensor and signal gathering unit, described capacitance/resistance formula bimodal sensor comprises N * 3 electrod-arrays that are distributed on the same plane, and N is the integer more than or equal to 3; Wherein, The electrode of first row and secondary series is rectangular electrode, and the electrode shape of the 3rd row electrode is circular, and its size is less than the electrode of first row and secondary series; The electrode that is positioned at same column is the electrode of identical material, size, and the interpolar spacing is also identical; During measurement; This sensor is vertically placed in the multi-phase fluid to be measured; By host computer control analog multichannel switch gating from bottom to up successively gating be positioned at the electrode of first row or an electrode of secondary series, and the electrode of gating and institute's gating is positioned at delegation but is positioned at tertial another electrode simultaneously; Apply the driving voltage signal through signal generating unit and power amplifier to two electrodes of gating; By the induction current of these two electrodes of signal gathering unit collection and send into host computer, carry out the measurement of multi phase interface liquid level according to the induction current of being gathered by host computer.
Measurement mechanism based on the multi phase interface liquid level of capacitance/resistance formula bimodal sensor is characterized in that, described capacitance/resistance formula bimodal sensor, and the quantity 9-90000 of electrode, each electrode is to be processed by sheet metal, thickness is 0.0001-1mm.
The present invention provides a kind of described multi phase interface liquid Level Measurement Method that realizes based on capacitance/resistance formula bimodal sensor that adopts simultaneously, comprises the following steps:
Induced electricity flow valuve when (1) demarcating pure gas and pure oil; This step can be accomplished before experiment, gets any a pair of rectangular electrode, places pure gas and pure oil respectively; One end applies pumping signal; Measure the induced signal of the other end, it is kept in the host computer, suppose that the induced electricity flow valuve of pure gas and pure oil is respectively I
a, I
o
(2) utilize resistance mode to obtain the following liquid level of oil: host computer control analog multichannel switch is positioned at two electrodes of same row successively from bottom to up in gating secondary series electrode and the 3rd row row; It is applied pumping signal; And measure induction current value sequence I successively; I＞0 o'clock is suspended, and can get oily following liquid level this moment is h
1=m * (a-1), m is the anode-cathode distance of the 3rd row electrode, and a is the numbering of a column electrode of gating when the I＞0, and numbering is numbered for ascending order from bottom to up, and a ∈ (1,2L, N);
(3) utilize electric capacity mode to obtain the last liquid level of oil again, host computer control analog multichannel switch is positioned at the electrode of same row successively from supreme gating first row of a and secondary series, apply pumping signal, and measure induction current value sequence I ' successively; Make
when 0＜ξ＜1; Suspend; Can get oily last liquid level
p this moment is the anode-cathode distance of secondary series electrode; H is the width of rectangular electrode; B numbers for the electrode of gating when 0＜I '＜1; B ∈ (a, L, N);
(4) utilize h=h at last
2-h
1Obtain the liquid level of crude oil.
Biggest advantage of the present invention is because capacitance/resistance formula bimodal Sensor Design is that one pole is board-like, and is therefore simple and reliable for structure, easy for installation, is difficult for being stopped up by viscous crude oil.Comparatively speaking, this technology is practical, and is convenient, is one of survey instrument of the most feasible multi phase interface liquid level.
Description of drawings
Fig. 1 is of the present invention based on bimodal sensor system assemblies schematic diagram;
Fig. 2 is a bimodal sensor synoptic diagram;
Fig. 3 is the tested multi phase interface synoptic diagram of simulation.
The practical implementation method
Below in conjunction with accompanying drawing and embodiment the present invention is done further detailed description.
Fig. 1 is based on bimodal sensor system assemblies schematic diagram according to of the present invention.It is made up of host computer 1, signal generating unit 2, power amplifier 3, analog multichannel switch 4, capacitance/resistance formula bimodal sensor 5 and signal gathering unit 6 six parts.Signal generating unit adopts synthetic (DDS) chip AD7008 of Direct Digital, and this chip can produce the sinusoidal excitation signal of different amplitudes and phase place.The amplitude of pumping signal and phase place can be by computer installations, through being installed on the exciting electrode array 8 after the power amplifier amplification.The computer control signal collecting unit is gathered the induced electricity flow valuve to electrod- array 7 and 9.
In insulation dull and stereotyped 10, adhere to N * 3 electrod-arrays (N is the integer more than or equal to 3) on the same plane, electrod- array 7,8 is shaped as rectangle, and electrod-array 9 is circular, and is as shown in Figure 2.Capacitance/resistance formula bimodal sensor is made up of the electrod-array of evenly arranging; The quantity 9-90000 of electrode; Electrode is to be processed by sheet metal; Thickness is 0.0001-1mm, and its size is decided according to the liquid level of the quantity fluid to be measured of electrode, and wherein the size of electrod-array 9 will be much smaller than the size of electrod-array 7,8.Insulation is dull and stereotyped processes for non-conducting material, such as plastics etc.
Liquid level for measuring multi phase interface provides the measurement of fluid position height in the most special gas/oil/water three-phase here, and the present invention also is applicable to other multi phase interface measurement.As shown in Figure 3, gas/oil/water three-phase liquid is measured the liquid level of oil through utilizing electric resistance sensor and capacitive transducer bimodal respectively; Utilize resistance mode to obtain the following liquid level of oil, host computer control analog multichannel switch is gate array 8 from bottom to up successively, applies pumping signal; And the induction current value sequence I of array of measure electrodes 9 successively; When I＞0, to suspend, can get oily following liquid level this moment is h
1=m * (a-1), m is the anode-cathode distance of electrod-array 9, and a numbers for the electrode of gating when the I＞0, and a ∈ (1,2L, N); Utilize electric capacity mode to obtain the last liquid level of oil again, host computer control analog multichannel switch applies pumping signal successively from the supreme gate array 8 of a; And the induction current value sequence I ' of array of measure electrodes 7 successively; When 0＜I '＜1, to suspend, can get oily last liquid level and do this moment
P is the anode-cathode distance of rectangular electrode array, and H is the width of rectangular electrode, and b numbers for the electrode of gating when 0＜I '＜1, and b ∈ (a, L, N), I
a, I
oInduced electricity flow valuve during for demarcation pure gas and pure oil.Calibration process places pure gas and pure oil respectively for getting a pair of rectangular electrode, and an end applies pumping signal, measures the induced signal of the other end.Utilize h=h at last
2-h
1Obtain the liquid level of crude oil.
Measuring method of the present invention specifically may further comprise the steps:
(1) at first, the induced electricity flow valuve when demarcating pure gas and pure oil, this step can be accomplished before experiment; Get a pair of rectangular electrode; Place pure gas and pure oil respectively, an end applies pumping signal, measures the induced signal of the other end; It is kept in the host computer, supposes that the induced signal value of pure gas and pure oil is respectively I
a, I
o
(2) secondly; Utilize resistance mode to obtain the following liquid level of oil, host computer control analog multichannel switch is gate array 8 from bottom to up successively, applies pumping signal; And the induction current value sequence I of array of measure electrodes 9 successively; When I＞0, to suspend, can get oily following liquid level this moment is h
1=m * (a-1), m is the anode-cathode distance of electrod-array 9, and a numbers for the electrode of gating when the I＞0, and a ∈ (1,2L, N);
(3) utilize electric capacity mode to obtain the last liquid level of oil again; Host computer control analog multichannel switch applies pumping signal successively from the supreme gate array 8 of a, and the induction current value sequence I ' of array of measure electrodes 7 successively; When 0＜I '＜1; Suspend, can get oily last liquid level this moment is the anode-cathode distance of rectangular electrode array for
p, and H is the width of rectangular electrode; B numbers for the electrode of gating when 0＜I '＜1; B ∈ (a, L, N);
(4) utilize h=h at last
2-h
1Obtain the liquid level of crude oil.
Claims (2)
1. measurement mechanism based on the multi phase interface liquid level of capacitance/resistance formula bimodal sensor; Be used to measure the liquid level of multi phase interface, comprise host computer, signal generating unit, power amplifier, analog multichannel switch, capacitance/resistance formula bimodal sensor and signal gathering unit, it is characterized in that; Described capacitance/resistance formula bimodal sensor comprises N * 3 electrod-arrays that are distributed on the same plane; N is the integer more than or equal to 3, and wherein, the electrode of first row and secondary series is rectangular electrode; The electrode shape of the 3rd row electrode is circular; Its size is less than the electrode of first row and secondary series, and the electrode that is positioned at same column is the electrode of identical material, size, and the interpolar spacing is also identical; During measurement; This sensor is vertically placed in the multi-phase fluid to be measured; By host computer control analog multichannel switch from bottom to up successively gating be positioned at the electrode of first row or an electrode of secondary series, and the electrode of gating and institute's gating is positioned at delegation but is positioned at tertial another electrode simultaneously; Apply the driving voltage signal through signal generating unit and power amplifier to two electrodes of gating; By the induction current of these two electrodes of signal gathering unit collection and send into host computer, carry out the measurement of multi phase interface liquid level according to the induction current of being gathered by host computer.
2. the measurement mechanism of the multi phase interface liquid level based on capacitance/resistance formula bimodal sensor according to claim 1; It is characterized in that described capacitance/resistance formula bimodal sensor, the quantity 9-90000 of electrode; Each electrode is to be processed by sheet metal, and thickness is 0.0001-1mm.
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| CN103245393B (en) * | 2012-02-02 | 2016-01-06 | 上海凡宜科技电子有限公司 | Proportion expression multiple switching thing liquid level measurement method and device |
| CN105698827B (en) * | 2016-01-28 | 2017-10-31 | 东南大学 | Resistive sensor array readout circuit and its reading method, a kind of sensor-based system |
| IT201700082457A1 (en) * | 2017-07-20 | 2019-01-20 | Eltek Spa | DEVICE FOR DETECTION OF THE LEVEL OF A MEDIA |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4503383A (en) * | 1982-01-07 | 1985-03-05 | Agar Corporation, N.V. | Device for detecting an interface between two fluids |
| CN87215727U (en) * | 1987-12-26 | 1988-10-12 | 东北工学院 | Lever detector for heat-tube exchanger |
| EP0338400A2 (en) * | 1988-04-16 | 1989-10-25 | DODUCO GMBH + Co Dr. Eugen DÀ¼rrwächter | Capacitive sensor for determining the liquid level in a container |
| CN1888828A (en) * | 2005-06-28 | 2007-01-03 | 肖书记 | Capacity step-by-step detection sensor |
-
2010
- 2010-11-12 CN CN2010105424810A patent/CN102052951B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4503383A (en) * | 1982-01-07 | 1985-03-05 | Agar Corporation, N.V. | Device for detecting an interface between two fluids |
| CN87215727U (en) * | 1987-12-26 | 1988-10-12 | 东北工学院 | Lever detector for heat-tube exchanger |
| EP0338400A2 (en) * | 1988-04-16 | 1989-10-25 | DODUCO GMBH + Co Dr. Eugen DÀ¼rrwächter | Capacitive sensor for determining the liquid level in a container |
| CN1888828A (en) * | 2005-06-28 | 2007-01-03 | 肖书记 | Capacity step-by-step detection sensor |
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