CN106872526B - A kind of contactless gas-liquid-solid three-phase bubbling bed phase content measuring device and method - Google Patents
A kind of contactless gas-liquid-solid three-phase bubbling bed phase content measuring device and method Download PDFInfo
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Abstract
The invention discloses a kind of contactless gas-liquid-solid three-phase bubbling bed phase content measuring device and methods.Including resistance measurement sensor, acoustic detection probe, resistance signal acquisition processing module, acoustical signal acquisition processing module and microcomputer.Wherein, resistance measurement sensor includes that 12 rectangular metal electrodes and isolated pipe two parts, acoustic detection probe are mounted on outside isolated pipe.Resistance signal acquisition processing module provides ac-excited signal, while also receiving processing detection signal.Acoustical signal acquisition processing module receives processing acoustic signals.The liquid phase content in gas-liquid-solid three phase flow is obtained using the resistance information of fluid, obtains gas phase content using the low-frequency information in acoustical signal, to obtain each phase content of three-phase.The present invention is a kind of method of non-cpntact measurement bubbling bed three phase flow containing rate, has many advantages, such as that structure is simple, easy for installation, avoids the problems such as destroying pipeline and influencing fluid.
Description
Technical field
The present invention relates to detection technique field more particularly to a kind of contactless gas-liquid-solid three-phase bubbling bed phase content measurements
Method.
Background technique
Multiphase flow is widely present in industrial production and daily life every field, as petroleum transmission with catalysis, sewage treatment,
Food production etc., research and detection multiphase flow parameter are most important to human lives.Phase content refers in heterogeneous fluid each point
Specific gravity shared by phase, is an important parameter in multiphase flow system, and Multiphase Flow mechanism is ground in the accurate detection of phase content
Studying carefully has great significance with status monitoring.Bubbling bed is a kind of common heterophase reactor, the application ten in industrial circle
Divide extensively, such as prepares methanol using three-phase bubbling bed.In bubbling bed, liquid is continuous phase, and gas is passed through from bottom, past in bed
Toward there are solid catalyst particles, it is typical gas-liquid-solid three phase flow system, has to the measurement of its three-phase phase content to industrial production
Important meaning.
However at present most of phase content measurement methods only for two phase flow system (such as: a kind of biphase gas and liquid flow phase
Containing rate and separate phase flow rate detection device and detection method, patent publication No.: CN105890693A) either in three-phase flow system
Certain single-phase phase content (such as: for the measurement method and its sensor of three phase circulation parameter of oil-gas-water, patent publication No.:
CN106092225A), the phase content of each phase in three-phase flow can not be obtained.A few methods are (such as: a kind of optical fiber conductance integration spy
Needle sensor, patent publication No.: CN204476404U) by combining the information of two methods acquisition to obtain each phase of three-phase flow
Phase content, but its sensor is contacted with detected fluid, the problems such as corrosion there is interference flowing field and sensor, use occasion by
Limit.
The present invention is directed to the status of existing three phase flow containing rate measurement, proposes a kind of contactless gas-liquid-solid three-phase drum
Steep bed phase content measuring device and method.The phase content method that the present invention uses existing patent (Non-contact integrated capacitor/
Resistance double-modal tomography measuring device and method, patent publication No.: CN103235013A) on the basis of, do not use tradition
The method that phase content is obtained by image reconstruction, directly establish phase content measurement model using measurement fluid resistance value, can be with
Effectively improve phase content measurement accuracy.This method includes first detected fluid resistance information and electrode by noncontacting electrode detection
The signal of tube wall coupled capacitor information, is then handled signal using the method for phase demodulation, obtains its real part information, i.e.,
The resistance information of fluid.Conductive phase (liquid phase) in three-phase flow and non-conductive phase (gas phase and solid is calculated using resistance information
Phase) phase content.Simultaneously in gas-liquid-solid three-phase fluid, the acoustic intelligence of gas phase is distributed in different frequency ranges from the acoustic intelligence of solid phase,
By extracting the low frequency gas phase information in acoustical signal, the gas phase phase content in three-phase flow is calculated.In summary two kinds of information,
Obtain each phase phase content in three-phase flow.The measurement of resistance and acoustical signal is all not necessarily to contact with fluid in the present invention, effectively keeps away
The problems such as having exempted from sensor corrosion and interference flowing field, simple installation have wide applicability.
Summary of the invention
The purpose of the present invention is overcoming the deficiencies of the prior art and provide, a kind of structure is simple and feasible non-contact gas-liquid-solid
Three-phase bubbling bed phase content measuring device and method.
The present invention discloses a kind of contactless gas-liquid-solid three-phase bubbling bed phase content measuring device first, including resistance is surveyed
Quantity sensor, acoustic detection probe, resistance signal acquisition processing module, acoustical signal acquisition processing module, microcomputer；Resistance
Measurement sensor is connected with one end of resistance signal acquisition processing module, acoustic detection probe and acoustical signal acquisition processing module
One end is connected, and resistance signal acquisition processing module harmony signal acquisition process module is connected with microcomputer respectively.
Preferably, the resistance measurement sensor includes 12 rectangular metal electrodes and isolated pipe, 12 rectangles
Metal electrode is equally spacedly looped around isolated pipe outer wall, and resistance signal acquisition processing module is connected with each metal electrode, according to
It is secondary that ac-excited signal is applied to each electrode, detection signal is received at remaining electrode.
The invention also discloses a kind of resistance surveys of contactless gas-liquid-solid three-phase bubbling bed phase content measuring device
Amount method, the specific steps of which are as follows:
1) the ac-excited signal V that resistance signal acquisition processing module providesiPass sequentially through excitation electrode, detected fluid with
Detecting electrode, wherein excitation electrode and insulation tube wall form coupled capacitor C1, detected fluid is equivalent to resistance R, detecting electrode with
The tube wall that insulate forms coupled capacitor C2, resistance signal acquisition processing module received at detecting electrode comprising fluid resistance R with
Coupled capacitor C1、C2The sensed current signal i of information；
2) after carrying out Current Voltage conversion, amplification, A/D conversion to sensed current signal i, the same of ac-excited signal is utilized
Phase reference signal and orthogonal reference signal carry out phase demodulation, obtain the phase and amplitude information of detection signal, by with exchange
The amplitude and phase of pumping signal compare, the resistance R for detected fluid that you can get it.
The present invention further discloses a kind of contactless gas-liquid-solid three-phase bubbling bed phase content measuring devices, in aforementioned dress
On the basis of setting, insulating cement is smeared on the acoustic detection probe surface, is attached to any of the resistance measurement sensor
In the middle part of gap between two metal electrodes, for detecting fluid voice signal.
Using above-mentioned apparatus novel gas-liquid-solid three phase flow containing rate measurement method the step of it is as follows:
1) conducting liquid is injected in isolated pipe, is put into the non-conductive solid of known volume size, simulates static two
Xiang Liu, non-conductive phase phase content at this time are denoted as αm, successively each metal electrode is applied using resistance signal acquisition processing module
Add ac-excited signal, and receive detection signal at remaining electrode, is transferred to microcomputer after signal processing and falls into a trap
Calculation obtains the resistance value information between each pair of electrode, is denoted as one group of resistance value information R*, and non-conductive solid volume is varied multiple times
Change phase content αm, and corresponding resistance value information R* is acquired, returning for non-conductive phase phase content is established using Partial Least Squares
Return model αm=f (R*)；
2) conducting liquid is injected in isolated pipe, bottom is passed through the air of known mass flow, at resistance signal acquisition
The resistance value information of reason module acquisition multiphase flow utilizes previous step using acoustical signal acquisition processing module synchronous acquisition acoustical signal
In established non-conductive phase phase content regression model gas phase content value at this time be calculated be denoted as αg, at the same time, will adopt
The acoustical signal collected carries out Daubechies second order wavelet decomposition, the detail signal being decomposed under different frequency range, by each details
The energy value of signal is denoted as E*, and gas flow is varied multiple times to change gas phase content αg, and acquire the details letter of corresponding acoustical signal
Number energy value E*, the regression model α of gas phase content is established using Partial Least Squaresg=f (E*)；
3) in gas-liquid-solid three phase flow system, liquid phase is continuous conduction phase, and solid phase and gas phase are non-conductive phase, phase content
There are following relationships:
αl+αg+αs=1
αm=αs+αg
Using the resistance value information of resistance signal acquisition processing module acquisition multiphase flow, measured with well-established phase content
The phase content α of non-conductive phase is calculated in modelm, using acoustical signal acquisition processing module synchronous acquisition acoustical signal, with having been established
The phase content α of gas phase is calculated in good phase content measurement modelg, so that each phase phase content in three-phase flow be calculated.
The present invention have compared with prior art the utility model has the advantages that
1) sensors electrode structure is simple, is easily installed, and does not contact directly with fluid, avoids sensor corrosion and interference
The problems such as flow field, extends applicability to a certain extent；
2) measurement obtains the phase content of each phase in gas-liquid-solid three phase flow, can more clearly understand each of heterogeneous fluid
Phase accounting；
3) phase content is calculated by prior established model, each Xiang Xianghan of three-phase flow can be obtained in a short time
Rate has preferable real-time, facilitates the status monitoring of fluid.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of contactless gas-liquid-solid three-phase bubbling bed phase content measuring device；
Fig. 2 is resistance measurement sensor and resistance information acquisition processing module structural schematic diagram；
Fig. 3 is the equivalent circuit diagram of single group excitation detecting electrode and detected fluid；
Fig. 4 is acoustic detection probe schematic view of the mounting position；
In figure: resistance measurement sensor 1, acoustic detection probe 2, resistance signal acquisition processing module 3, at acoustical signal acquisition
Manage module 4, microcomputer 5, isolated pipe 6, rectangular metal electrode 7.
Specific embodiment
As shown in Figure 1, gas-liquid-solid three-phase bubbling bed phase content measuring device includes resistance measurement sensor 1, sonic detection
Probe 2, resistance signal acquisition processing module 3, acoustical signal acquisition processing module 4, microcomputer 5；Resistance measurement sensor 1 with
One end of resistance signal acquisition processing module 3 is connected, and acoustic detection probe 2 is connected with one end of acoustical signal acquisition processing module 4,
3 harmony signal acquisition process module 4 of resistance signal acquisition processing module is connected with microcomputer 5 respectively.
As shown in Fig. 2, resistance measurement sensor 1 includes 6,12 rectangles of 12 rectangular metal electrodes 7 and isolated pipe
Metal electrode 7 is equally spacedly looped around 6 outer wall of isolated pipe.Resistance signal acquisition processing module 4 and each 7 phase of metal electrode
Even, ac-excited signal successively is applied to each electrode, detection signal is received at remaining electrode.In the detection signal received
Both included the resistance information of multiphase flow, and also included the coupled capacitor information between electrode 7 and insulation tube wall 6.
As shown in figure 3, the ac-excited signal V that resistance signal acquisition processing module 3 providesiPass sequentially through excitation electrode,
Detected fluid and detecting electrode, wherein excitation electrode and insulation tube wall form coupled capacitor C1, detected fluid is equivalent to resistance R,
Detecting electrode and insulation tube wall form coupled capacitor C2.Resistance signal acquisition processing module 3 receives at detecting electrode includes
Fluid resistance R and coupled capacitor C1、C2The sensed current signal i of information.3 pairs of detection electricity of resistance signal acquisition processing module later
Stream signal i obtains digital output signal after carrying out Current Voltage conversion, A/D conversion
Given sinusoidal excitation voltage signal Vi(t) are as follows:
Vi(t)=A sin ω t
In formula, A is the amplitude of sinusoidal excitation voltage signal, and ω is angular frequency.
By fluid resistance R, coupled capacitor C1、C2With the output voltage signal V obtained after Current Voltage conversiono(t) are as follows:
Wherein, A' is the amplitude of output voltage signal, and θ is the phase of output voltage signal, RfFor the anti-of operational amplifier
Feed resistance, CxFor C1And C2Series connection, value C1C2/(C1+C2)。
Digital output signal V of the output voltage signal after A/D is convertedo(nT) are as follows:
Vo(nT)=A'sin (2 π nT/N+ θ)
Wherein, T is the sampling period, and N is each cycle hits, n=0,1,2 ..., N-1.
Next phase demodulation is carried out using the same phase reference signal and orthogonal reference signal of ac-excited signal.Two-way ginseng
Signal is examined to be respectively as follows:
Vsin(nT)=A1sin(2πnT/N)
Vcos(nT)=A2cos(2πnT/N)
Wherein, A1And A2The respectively amplitude of two-way reference signal.
By digital output signal Vo(nT) after carrying out computing cross-correlation with two-way reference signal respectively, two direct currents are obtained
Signal VrWith Vq:
Output voltage signal V can be acquired by the two signalso(t) amplitude and phase:
It is compared by the amplitude with sinusoidal excitation voltage signal with phase, so that it may obtain the resistance letter of detected fluid
Breath:
As shown in figure 4, insulating cement is smeared on 2 surface of acoustic detection probe, it is attached to any the two of resistance measurement sensor 1
In the middle part of gap between a metal electrode, for detecting the fluid sound signal of the portions.
The step of gas-liquid-solid three-phase flow containing rate measurement method, is as follows:
1) conducting liquid is injected in isolated pipe, is put into the non-conductive solid of known dimensions, simulates static two phase flow,
Non-conductive phase phase content at this time is denoted as αm.Successively each metal electrode is applied using resistance signal acquisition processing module and is exchanged
Pumping signal, and detection signal is received at remaining electrode, it is transferred in microcomputer and is calculated after signal processing
Resistance value information between each pair of electrode is denoted as one group of resistance value information R*.Non-conductive solid volume is varied multiple times to change phase
α containing ratem, and corresponding resistance value information R* is acquired, the regression model α of non-conductive phase phase content is established using Partial Least Squaresm
=f (R*).
2) conducting liquid is injected in isolated pipe, bottom is passed through the air of known mass flow, at resistance signal acquisition
The resistance value information for managing module acquisition multiphase flow, utilizes acoustical signal acquisition processing module synchronous acquisition acoustical signal.Utilize previous step
In established non-conductive phase phase content regression model gas phase content value at this time be calculated be denoted as αg, at the same time, will adopt
The acoustical signal collected carries out Daubechies second order wavelet decomposition, the detail signal being decomposed under different frequency range, by each details
The energy value of signal is denoted as E*.Gas flow is varied multiple times to change gas phase content αg, and acquire the details letter of corresponding acoustical signal
Number energy value E*, the regression model α of gas phase content is established using Partial Least Squaresg=f (E*).
3) in gas-liquid-solid three phase flow system, liquid phase is continuous conduction phase, and solid phase and gas phase are non-conductive phase, phase content
There are following relationships:
αl+αg+αs=1
αm=αs+αg
Using the resistance value information of resistance signal acquisition processing module acquisition multiphase flow, measured with well-established phase content
The phase content α of non-conductive phase (gas phase and solid phase) is calculated in modelm.Believed using acoustical signal acquisition processing module synchronous acquisition sound
Number, the phase content α of gas phase is calculated with well-established phase content measurement modelg, to be calculated every in three-phase flow
One phase phase content.
The device and method mentioned in the present invention are carried out on the polyvinyl chloride bubbling bed that internal diameter is 110mm
Experiment, demonstrates feasibility of the invention.Test medium is empty gas and water and nonconducting ceramic particle, the results showed that sharp
With the apparatus and method mentioned in the present invention, the absolute deviation between final measurement result and reference value, can be with less than 5%
It realizes the non-cpntact measurement to phase phase content each in three-phase flow system, and obtains preferable measurement result.
Claims (1)
1. a kind of novel gas-liquid-solid three phase flow containing rate of contactless gas-liquid-solid three-phase bubbling bed phase content measuring device measures
Method, the contactless gas-liquid-solid three-phase bubbling bed phase content measuring device includes resistance measurement sensor (1), sonic detection
Probe (2), resistance signal acquisition processing module (3), acoustical signal acquisition processing module (4), microcomputer (5)；Resistance measurement
Sensor (1) is connected with one end of resistance signal acquisition processing module (3), acoustic detection probe (2) and acoustical signal acquisition process
One end of module (4) is connected, resistance signal acquisition processing module (3) harmony signal acquisition process module (4) respectively with microcomputer
Calculation machine (5) is connected；
The resistance measurement sensor includes 12 rectangular metal electrodes (7) and isolated pipe (6), 12 rectangular metal electricity
Pole (7) is equally spacedly looped around isolated pipe (6) outer wall, and resistance signal acquisition processing module is connected with each metal electrode (7),
Ac-excited signal successively is applied to each electrode, detection signal is received at remaining electrode；
Insulating cement is smeared on acoustic detection probe (2) surface, is attached to any the two of the resistance measurement sensor
In the middle part of gap between a metal electrode (7), for detecting fluid voice signal；
Method and step is as follows:
1) conducting liquid is injected in isolated pipe, is put into the non-conductive solid of known volume size, simulates static two phase flow,
Non-conductive phase phase content at this time is denoted as αm, successively each metal electrode is applied using resistance signal acquisition processing module and is exchanged
Pumping signal, and detection signal is received at remaining electrode, it is transferred in microcomputer and is calculated after signal processing
Resistance value information between each pair of electrode is denoted as one group of resistance value information R*, non-conductive solid volume is varied multiple times to change phase
α containing ratem, and corresponding resistance value information R* is acquired, the regression model α of non-conductive phase phase content is established using Partial Least Squaresm
=f (R*)；
2) conducting liquid is injected in isolated pipe, bottom is passed through the air of known mass flow, utilizes resistance signal acquisition process mould
Block acquires the resistance value information of multiphase flow, using acoustical signal acquisition processing module synchronous acquisition acoustical signal, using building in previous step
The non-conductive phase phase content regression model stood is calculated gas phase content value at this time and is denoted as αg, at the same time, will collect
Acoustical signal carry out Daubechies second order wavelet decomposition, the detail signal being decomposed under different frequency range, by each detail signal
Energy value be denoted as E*, gas flow is varied multiple times to change gas phase content αg, and acquire the detail signal energy of corresponding acoustical signal
Magnitude E* establishes the regression model α of gas phase content using Partial Least Squaresg=f (E*)；
3) in gas-liquid-solid three phase flow system, liquid phase is continuous conduction phase, and solid phase and gas phase are non-conductive phase, and phase content exists
Following relationship:
αl+αg+αs=1
αm=αs+αg
Wherein, αl、αg、αsIt is the phase content of liquid phase, solid phase, gas phase, α respectivelymFor the phase content of non-conductive phase；
Using the resistance value information of resistance signal acquisition processing module acquisition multiphase flow, with well-established phase content measurement model
The phase content α of non-conductive phase is calculatedm, using acoustical signal acquisition processing module synchronous acquisition acoustical signal, with well-established
The phase content α of gas phase is calculated in phase content measurement modelg, so that each phase phase content in three-phase flow be calculated.
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Granted publication date: 20190521 Termination date: 20200109 |