CN106124371B - A kind of Dual-Phrase Distribution of Gas olid fineness measurement device and measurement method based on electrostatic method - Google Patents
A kind of Dual-Phrase Distribution of Gas olid fineness measurement device and measurement method based on electrostatic method Download PDFInfo
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- CN106124371B CN106124371B CN201610629282.0A CN201610629282A CN106124371B CN 106124371 B CN106124371 B CN 106124371B CN 201610629282 A CN201610629282 A CN 201610629282A CN 106124371 B CN106124371 B CN 106124371B
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 7
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- 239000002245 particle Substances 0.000 claims description 16
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
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Abstract
The invention discloses a kind of Dual-Phrase Distribution of Gas olid fineness measurement device based on electrostatic method, including the pipeline flowed through for Dual-Phrase Distribution of Gas olid, upstream electrostatic transducer and downstream electrostatic transducer are installed on the tube wall of pipeline, one end of upstream electrostatic transducer and downstream electrostatic transducer penetrates in pipeline, the other end of upstream electrostatic transducer and downstream electrostatic transducer is connect with filtering and amplifying circuit, and filtering and amplifying circuit is connected with A/D conversion module, fineness processing unit in turn.The invention also discloses the measurement methods using above-mentioned measuring device.A kind of Dual-Phrase Distribution of Gas olid fineness measurement device based on electrostatic method of the present invention, hardware configuration is simply at low cost, and measurement method is simple, and real-time measurement and measurement accuracy height can be carried out when Dual-Phrase Distribution of Gas olid is flowed.
Description
Technical field
The invention belongs to sensor detection and digital signal processing technique fields, and in particular to a kind of gas based on electrostatic method
Fixed double phase flow fineness measurement device, the method for further relating to measure using above-mentioned measuring device.
Background technique
In the industrial circle that many is related to Dual-Phrase Distribution of Gas olid, the fineness of solid particle can be to product quality, production efficiency
Deng generation significant impact, such as influence of the cement fineness to cement output, shadow of the fineness of pulverized coal to the efficiency of combustion of thermal power generation
Ring etc..Currently, common diameter measurement method is screening method and optical method.Screening method measurement result is accurate, but relies primarily on
Screen analyzer measures preprepared material, the function without real time monitoring；Optical method can be in real time to
Two phase flow in movement carries out diameter measurement, low but there are precision, equipment costly the drawbacks of.
Electrostatic method be in recent years many scholars in the method for measuring gas-solid diphasic stream parameter of research.Gas-solid two streams
In the electrostatic that all adheres to of solid particle, the charge adhered on particle can be exported by electrostatic transducer, pass through amplification filter
Electrostatic signal is converted to the accessible digital signal of computer by the signal processing circuits such as wave and AD conversion, at digital signal
Adjustment method obtains the gas-solid diphasic stream parameter of some needs.
Summary of the invention
The object of the present invention is to provide a kind of Dual-Phrase Distribution of Gas olid fineness measurement device based on electrostatic method solves existing thin
The problem that degree measurement cannot monitor in real time and precision is low.
The purpose of the present invention also provides the method measured using above-mentioned measuring device.
The first technical solution of the present invention is a kind of Dual-Phrase Distribution of Gas olid diameter measurement dress based on electrostatic method
It sets, including the pipeline flowed through for Dual-Phrase Distribution of Gas olid, upstream electrostatic transducer is installed on the tube wall of pipeline and downstream electrostatic passes
One end of sensor, upstream electrostatic transducer and downstream electrostatic transducer penetrates in pipeline, and upstream electrostatic transducer and downstream are quiet
The other end of electric transducer is connect with filtering and amplifying circuit, and filtering and amplifying circuit is connected with A/D conversion module in turn, at fineness
Manage unit.
The characteristics of the first of the invention technical solution, also resides in:
Spacing between upstream electrostatic transducer and downstream electrostatic transducer is not more than 10cm.
Second of technical solution of the present invention is a kind of Dual-Phrase Distribution of Gas olid diameter measurement side based on electrostatic method
Method is specifically implemented according to the following steps:
Step 1: calculating the power spectral density function of electrostatic signal；
Step 2: fineness scalar is calculated according to the power spectral density function that step 1 obtains；
Step 3: the fineness scalar obtained according to step 2 demarcates different fineness；
Step 4: diameter measurement.
The characteristics of second of technical solution of the present invention, also resides in:
Step 1 specifically:
If fineness is mkParticle fallen above pipeline, acquire upstream electrostatic transducer and downstream electrostatic transducer and obtain
Electrostatic signal, respectively acquire n voltage data from upstream electrostatic transducer and downstream electrostatic transducer, form upstream voltage signal
ColumnWith downstream voltage signalIt willWithCarry out fast Fourier
Transformation obtains new sequence of complex numbersWithIt takesConjugate complex numberIt willWithThe element multiplication of same index i obtains sequence
For the Dual-Phrase Distribution of Gas olid electrostatic signal power spectral density function.
The integer power that the value of n is 2.
Step 2 specifically:
To sequenceIn element modulus sum again to obtain fineness mkCorresponding fineness scalar f (mk, n):
Step 3 specifically:
Calculating separately fineness is m0,m1,m2... particle corresponding to fineness scalar, constitute sequence f (m1, n), f (m2,
N), f (m3, n) ..., fineness scalar f (m1, n), f (m2, n), f (m3, n) ... and fineness m0,m1,m2... between there is lists
Tune relationship, to fineness scalar f (m1, n), f (m2, n), f (m3, n) ... carry out cubic spline interpolation, the fineness mark after obtaining interpolation
Measure g (p1, n), g (p2, n), g (p3, n) ... and the fineness p after interpolation1, p2, p3..., (pi,g(pi, n)) it is interpolation point.
Step 4 specifically:
The fineness scalar x of candidate particles is obtained according to method shown in step 2, by g (p obtained in x and step 3i, n) into
Row compares, and finds out the g (p closest to xx, n), g (px, n) and corresponding pxIt is exactly the diameter measurement value of candidate particles.
The beneficial effects of the present invention are: a kind of Dual-Phrase Distribution of Gas olid fineness measurement device based on electrostatic method of the present invention, hardware
Structure is simply at low cost, and measurement method is simple, and real-time measurement can be carried out when Dual-Phrase Distribution of Gas olid is flowed, and measurement essence
Degree is high.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of the Dual-Phrase Distribution of Gas olid fineness measurement device based on electrostatic method of the present invention；
Fig. 2 is the process that fineness scalar is calculated in a kind of Dual-Phrase Distribution of Gas olid diameter measurement method based on electrostatic method of the present invention
Figure.
In figure, 1. upstream electrostatic transducers, 2. filtering and amplifying circuits, 3.A/D conversion module, 4. fineness processing units, 5.
Pipeline, 6. downstream electrostatic transducers.
Specific embodiment
The following describes the present invention in detail with reference to the accompanying drawings and specific embodiments.
A kind of Dual-Phrase Distribution of Gas olid fineness measurement device based on electrostatic method of the present invention, structure is as shown in Figure 1, include being used for gas
The pipeline 5 that fixed double phase flow flows through is equipped with upstream electrostatic transducer 1 and downstream electrostatic transducer 6, upstream on the tube wall of pipeline 5
Spacing between electrostatic transducer 1 and downstream electrostatic transducer 6 is not more than 10cm, can guarantee upstream electrostatic transducer 1 in this way
Signal between downstream electrostatic transducer 6 has good correlation, upstream electrostatic transducer 1 and downstream electrostatic transducer 6
One end penetrate in pipeline 5, the other end of upstream electrostatic transducer 1 and downstream electrostatic transducer 6 with filtering and amplifying circuit 2
Connection, filtering and amplifying circuit 2 are connected with A/D conversion module 3, fineness processing unit 4 in turn.
Dual-Phrase Distribution of Gas olid above the pipeline 5 flow downward, flow through upstream electrostatic transducer 1 and downstream electrostatic transducer
When 6, upstream electrostatic transducer 1 and downstream electrostatic transducer 6 can collect electrostatic signal.
The electric signal that upstream electrostatic transducer 1 and downstream electrostatic transducer 6 acquire is converted to A/D by filtering and amplifying circuit 2
The collectable standard voltage signal of conversion module 3, the generally voltage signal of 0~3V, upstream electrostatic transducer 1 and downstream electrostatic
The collected quantity of electric charge of sensor 6 is more, and the amplitude fluctuation of the voltage of circuit output is bigger.
A kind of Dual-Phrase Distribution of Gas olid diameter measurement method based on electrostatic method of the present invention, is specifically implemented according to the following steps:
Step 1: calculating the power spectral density function of electrostatic signal
If fineness is mkParticle fallen above pipeline 5, acquire upstream electrostatic transducer 1 and downstream electrostatic transducer 6
Obtained electrostatic signal respectively acquires n voltage data, composition upstream electricity from upstream electrostatic transducer 1 and downstream electrostatic transducer 6
Press signal trainWith downstream voltage signalI=0,1,2 ..., n, for the fortune for meeting fast Fourier variation
Calculation condition, the integer power that the value of n is 2, the n the big more can reflect the feature of signal.It willWithIt carries out quick
Fourier transformation (FFT) obtains new sequence of complex numbersWithIt takesConjugate complex number
It willWithThe element multiplication of same index i obtains sequence
The as Dual-Phrase Distribution of Gas olid electrostatic signal power spectral density function.
Step 2: fineness scalar is calculated according to the power spectral density function that step 1 obtains
To sequenceIn element modulus sum again to obtain fineness mkCorresponding fineness scalar f (mk, n):
The flow chart for calculating fineness scalar using power spectral density function is as shown in Figure 2.
Step 3: the fineness scalar obtained according to step 2 demarcates different fineness
Calculating separately fineness is m0,m1,m2... particle corresponding to fineness scalar, constitute sequence f (m1, n), f (m2,
N), f (m3, n) ..., fineness scalar f (m1, n), f (m2, n), f (m3, n) ... and fineness m0,m1,m2... between there is lists
Tune relationship, to fineness scalar f (m1, n), f (m2, n), f (m3, n) ... carry out cubic spline interpolation, the fineness mark after obtaining interpolation
Measure g (p1, n), g (p2, n), g (p3, n) ... and the fineness p after interpolation1, p2, p3..., (pi,g(pi, n)) it is interpolation point, interpolation
Point (pi,g(pi, n)) quantity it is more, measurement accuracy is higher.
Wherein, fineness scalar f (m1, n), f (m2, n), f (m3, n) ... the method for repeatedly measuring and averaging should be taken true
It is fixed, to reduce the influence of random error.
Step 4: diameter measurement
When the particle to unknown fineness measures, the fineness scalar of candidate particles is obtained according to method shown in step 2
X, by g (p obtained in x and step 3i, n) and it is compared, find out the g (p closest to xx, n), g (px, n) and corresponding pxBe exactly to
Survey the diameter measurement value of particle.
Claims (3)
1. a kind of Dual-Phrase Distribution of Gas olid diameter measurement method based on electrostatic method, which is characterized in that using a kind of based on electrostatic method
Dual-Phrase Distribution of Gas olid fineness measurement device, specific structure are as follows:
Including the pipeline (5) flowed through for Dual-Phrase Distribution of Gas olid, be equipped on the tube wall of pipeline (5) upstream electrostatic transducer (1) and
One end of downstream electrostatic transducer (6), upstream electrostatic transducer (1) and downstream electrostatic transducer (6) penetrates in pipeline (5),
The other end of upstream electrostatic transducer (1) and downstream electrostatic transducer (6) is connect with filtering and amplifying circuit (2), amplification filtering
Circuit (2) is connected with A/D conversion module (3), fineness processing unit (4) in turn；
It is specifically implemented according to the following steps:
Step 1: calculating the power spectral density function of electrostatic signal；
The step 1 specifically:
If fineness is mkParticle fall above the pipeline (5), acquire upstream electrostatic transducer (1) and downstream electrostatic transducer (6)
Obtained electrostatic signal, from upstream electrostatic transducer (1) and downstream electrostatic transducer (6) n voltage data of each acquisition, composition
Swim voltage signal columnWith downstream voltage signalIt willWithIt carries out fast
Fast Fourier transformation obtains new sequence of complex numbersWithIt takesConjugate complex numberIt willWithThe element multiplication of same index i obtains sequence
For the Dual-Phrase Distribution of Gas olid electrostatic signal power spectral density function；The integer power that the value of the n is 2；
Step 2: fineness scalar is calculated according to the power spectral density function that step 1 obtains；
The step 2 specifically:
To sequenceIn element modulus sum again to obtain fineness mkCorresponding fineness scalar f (mk, n):
Step 3: the fineness scalar obtained according to step 2 demarcates different fineness；
Step 4: diameter measurement.
2. a kind of Dual-Phrase Distribution of Gas olid diameter measurement method based on electrostatic method according to claim 1, which is characterized in that institute
State step 3 specifically:
Calculating separately fineness is m0,m1,m2... particle corresponding to fineness scalar, constitute sequence f (m1, n), f (m2, n), f
(m3, n) ..., fineness scalar f (m1, n), f (m2, n), f (m3, n) ... and fineness m0,m1,m2... between there is dullness close
System, to fineness scalar f (m1, n), f (m2, n), f (m3, n) ... carry out cubic spline interpolation, the fineness scalar g after obtaining interpolation
(p1, n), g (p2, n), g (p3, n) ... and the fineness p after interpolation1, p2, p3..., (pi,g(pi, n)) it is interpolation point.
3. a kind of Dual-Phrase Distribution of Gas olid diameter measurement method based on electrostatic method according to claim 2, which is characterized in that institute
State step 4 specifically:
The fineness scalar x of candidate particles is obtained according to method shown in step 2, by g (p obtained in x and step 3i, n) compared
It is right, find out the g (p closest to xx, n), g (px, n) and corresponding pxIt is exactly the diameter measurement value of candidate particles.
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| CN107764889B (en) * | 2017-09-27 | 2020-04-21 | 西安理工大学 | Gas-solid two-phase flow dust carbon content measuring method based on signal energy method |
| CN107764351A (en) * | 2017-09-27 | 2018-03-06 | 西安理工大学 | Method based on electrostatic method real-time online measuring Dual-Phrase Distribution of Gas olid mass flow |
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