CN100582682C - Device and method for measuring gas-solid diphasic stream parameter in square pneumatic conveying pipe - Google Patents
Device and method for measuring gas-solid diphasic stream parameter in square pneumatic conveying pipe Download PDFInfo
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- CN100582682C CN100582682C CN200710152036A CN200710152036A CN100582682C CN 100582682 C CN100582682 C CN 100582682C CN 200710152036 A CN200710152036 A CN 200710152036A CN 200710152036 A CN200710152036 A CN 200710152036A CN 100582682 C CN100582682 C CN 100582682C
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Abstract
The invention discloses a measuring device and the method for measuring the two-phase flow parameter of gas and solid in square pneumatic conveying pipeline, belonging to the measurement technology of two-phase flow parameter of gas and solid in conveying pipeline. The measuring device is that an electrostatic sensor, and a charge preamplifier before the electrostatic sensor, a signal process circuit, a dada acquisition card, and a computer are arranged on the square conveying pipeline in series. The measuring method is as follows: the quantity of electricity of the static charges carried on the solid particles in the square pipeline when passing through the square electrode is represented with the electrostatic sensor through electrostatic induction; the weak inductive charges on the electrode are pretreated with the charge preamplifier, and then is input in the computer via the signal process circuit and the dada acquisition card; the sampling signal is analyzed and processed to obtain the corresponding phase flow parameter of gas and solid in square pipeline, so as to realize the measurement to the phase flow parameter of gas and solid in square pneumatic conveying pipeline.
Description
Technical field
The invention belongs to the measuring technique scope of gas-solid diphasic stream parameter in the conveyance conduit, the measurement mechanism and the method for gas-solid diphasic stream parameter in particularly a kind of square pneumatic conveying pipe.
Background technology
Dual-Phrase Distribution of Gas olid is prevalent in the spontaneous phenomenon, and relates to a lot of fields of national product, with industrial and agricultural production close ties is arranged.Because the channelization of solid material is carried and to be had the conevying efficiency height, avoid environmental impact, increases advantage such as security, so it becomes the relevant the closest application with industrial and agricultural production of Dual-Phrase Distribution of Gas olid, and the pipeline transportation that is widely used in coal dust in the thermal power generation, the pipeline transportation of flour in the food industry, the pipeline transportation of medicine during medicine is made, the pipeline transportation of industrial chemicals etc. in the pipeline transportation of ore and the chemical industry in the metallurgical industry.Just because of this, the research of relevant Dual-Phrase Distribution of Gas olid is subjected to increasing attention.
Produced a lot of Dual-Phrase Distribution of Gas olid measuring methods at present, but since not accurately theoretical model can set forth the mobile Changing Pattern of Dual-Phrase Distribution of Gas olid fully, so these methods all have certain limitation.The flow condition of Dual-Phrase Distribution of Gas olid is quite complicated, and parameter is numerous, and flow pattern is various, and its variation is subjected to influence of various factors.
In strength is carried, since the mutual collision between the solid particle, the friction between collision between solid particle and the duct wall and solid particle and the air-flow, and solid particle can carry a certain amount of electric charge, and the quantity of electric charge carries certain two-phase flow information.Based on the ultimate principle of electrostatic induction, many scholars begin to attempt electrostatic method is applied in the parameter measurement of Dual-Phrase Distribution of Gas olid.In addition, electrostatic method almost can be used for measuring all parameters of Dual-Phrase Distribution of Gas olid, and has special advantages aspect some parameter of measurement, so electrostatic method and the good effect that obtain very rapid in the development aspect the gas-solid diphasic stream parameter measurement in recent years is particularly at the electrostatic method research of circular pipe with use.
In some industry, square pipe also is used in the conveying of solid material strength.The present invention is directed to square pneumatic conveying pipe, design a static sensing and a measurement mechanism, it obtains the parameter of Dual-Phrase Distribution of Gas olid in the square pneumatic conveying pipe by the electric weight of measuring the entrained electric charge of strength conveying solid substance particle.
Summary of the invention
The measurement mechanism and the method that the purpose of this invention is to provide gas-solid diphasic stream parameter in a kind of square pneumatic conveying pipe.The measurement mechanism of gas-solid diphasic stream parameter is that electrostatic transducer 2 is installed on the outer wall of square conveyance conduit 1 or inwall in the described square pneumatic conveying pipe; Electrostatic transducer 2 and front end charge amplifier 3, signal processing circuit 4, data collecting card 5 and computing machine 6 series connection.It is characterized in that fixed insulation layer 8, electrostatic transducer 2 and screen layer 9 successively on the outer wall of square conveyance conduit wherein, also have a layer insulating 8 between electrostatic transducer 2 and the screen layer 9; Described is to be fixed on the square conveying pipeline inner wall by insulation course 8 on the inwall of square conveyance conduit electrostatic transducer 2 being installed.
The electrode of described electrostatic transducer 2 is a square-shaped electrode, and is corresponding with square conveyance conduit.
To be electrostatic transducer 2 reflect the electric weight of solid particle time of flowing through square-shaped electrode in square pipe institute static electrification lotus by electrostatic induction to the measuring method of gas-solid diphasic stream parameter in the described square pneumatic conveying pipe, faint induced charge on 3 pairs of electrostatic transducer 2 electrodes of front end charge amplifier carries out pre-service, the while enhancing signal, sensor signal after the pre-service is sent to signal processing circuit 4, finishing signal amplifies, filtering, signal operation, input to data collecting card 5 after signal is regular, data collecting card 5 carries out analog to digital conversion, make and meet the sample frequency requirement, and input computing machine 6, computing machine 6 passes through handling procedure, sampled signal is carried out corresponding analyzing and processing, obtain the relevant parameter of Dual-Phrase Distribution of Gas olid in the square pipe, realize the measurement of gas-solid diphasic stream parameter in the square shaped Pneumatic conveying pipeline.
Described front end charge amplifier should be pressed close to the square-shaped electrode arrangement, makes it reach the purpose that reduces faint charge signal loss.
Described front end charge amplifying circuit adopts and reaches 10
12The amplification chip of the high impedance of ohm, signal are realized impedance and back level letter treatment circuit coupling behind the front end charge amplifier, it handles the electrostatic transducer original signal, and is most important to the realization of whole apparatus function.
The axial width of described square-shaped electrode is the decision parameter of electrostatic transducer performance, and electrode is too narrow, and the induced signal of electrostatic transducer is too little, measures to be subjected to noise easily; Electrode is too wide, Spatial Filtering Effect is obvious, the frequency band of electrostatic transducer output signal will reduce greatly, owing to the convolution effect of defiling causes the related function peak region between the upstream and downstream sensor signal smooth, determine the uncertainty of transit time estimation or the accuracy that error increases also and then influence measurement result according to related function.
Described electrostatic transducer uses a solid concentration of then measuring Dual-Phrase Distribution of Gas olid in the square pipe separately; Two are used, and then measure the solid phase mass rate of Dual-Phrase Distribution of Gas olid in the square pipe and the speed of solid particle.
The invention has the beneficial effects as follows utilize the present invention respectively in the square shaped pipeline freely falling body particle and strength carry subparticle to measure, the correlation method result that tests the speed shows that actual measurement particle speed and particle theoretical reference speed coincide.This measurement mechanism has been realized the measurement of a plurality of parameters of Dual-Phrase Distribution of Gas olid in the square shaped Pneumatic conveying pipeline, uses a static can measure the solid concentration of Dual-Phrase Distribution of Gas olid in the square pipe; Two electrostatic transducers are used the solid phase mass rate of then measuring Dual-Phrase Distribution of Gas olid in the square pipe and the speed of solid particle.Utilize a plurality of parameters of above-mentioned measurement, the design of the square pneumatic conveying pipe that uses to every profession and trade provides data refer, speeds up the work greatly.
Description of drawings
Fig. 1, the static sensing that is applied to square pneumatic conveying pipe and measurement mechanism synoptic diagram.
Fig. 2 is applied to the electrostatic transducer of square pneumatic conveying pipe schematic cross-section is installed, and (a) electrode is installed in the square pipe outer wall; (b) electrode is installed in the square pipe inwall.
Fig. 3, charge amplifying circuit principle schematic.
Fig. 4, square electrostatic transducer typical case output signal: (a) individual particle signal; (b) many particle signal.
Fig. 5, signal correction function: (a) corresponding to the related function of signal among Fig. 4 (a); (b) corresponding to the related function of signal among Fig. 4 (b).
Embodiment
The invention provides the measurement mechanism and the method for gas-solid diphasic stream parameter in a kind of square pneumatic conveying pipe.In the static sensing and measurement mechanism synoptic diagram that are applied to square pneumatic conveying pipe shown in Figure 1, electrostatic transducer 2 is installed, electrostatic transducer 2 and front end charge amplifier 3, signal processing circuit 4, data collecting card 5 and computing machine 6 series connection on square conveyance conduit 1.Fig. 2 (a) is depicted as electrostatic transducer 2 square-shaped electrode and is installed in square pipe outer wall synoptic diagram, fixed insulation layer 8, electrostatic transducer 2, insulation course 8 and screen layer 9 successively on the outer wall of pipeline; Fig. 2 (b) is installed in square pipe inwall synoptic diagram for electrostatic transducer 2 square-shaped electrode, and square-shaped electrode is to be fixed on square conveyance conduit 1 inwall by insulation course 8.
The basic functional principle of the measuring method of gas-solid diphasic stream parameter as shown in Figure 1 in the described square pneumatic conveying pipe, when utilizing air-flow in pipeline during conveying solid substance particle 7, because between the solid particle 7, with the wall collision of pipeline 1 and with the friction of air-flow, solid particle 7 carries a certain amount of static charge.Electrostatic transducer 2 square-shaped electrode are key points of whole device, and it mainly reflects that by electrostatic induction solid particle 7 flows through the electric weight of electrostatic transducer 2 square-shaped electrode time institute static electrification lotuses in square pipe 1.Carry out pre-service by the faint induced charge on 3 pairs of electrostatic transducer 2 square-shaped electrode of front end charge amplifier, simultaneously can enhancing signal, so that the later stage is again to the signal of sensor analyzing and processing.For reduce the loss of faint charge signal as far as possible, front end charge amplifier 3 is pressed close to square-shaped electrode and is settled.Sensor signal after the pre-service is sent to signal processing circuit.Signal processing circuit 4 is mainly finished signal amplification, filtering, signal operation, signal and is inputed to data collecting card 5 after regular, data collecting card 5 carries out analog to digital conversion, make and meet the sample frequency requirement, and input computing machine 6, computing machine 6 passes through handling procedure, sampled signal is carried out corresponding analyzing and processing, obtain the relevant parameter of Dual-Phrase Distribution of Gas olid in the square pipe, realize the measurement of gas-solid diphasic stream parameter in the square shaped Pneumatic conveying pipeline.
Electrostatic method is electrostatic transducer in the maximum difference of circular pipe and square pipe, and the maximum difference of sensor is at the electrode shape of sensor.Because the difference of electrode shape, the response characteristic of electrostatic transducer when solid particle is flowed through sensor electrode also has fairly obvious difference, is mainly reflected in four corners of square-shaped electrode.
The axial width of square-shaped electrode is the decision parameter of electrostatic transducer performance, and electrode is too narrow, and the induced signal of electrostatic transducer is too little, measures to be subjected to noise easily; Electrode is too wide, and Spatial Filtering Effect is obvious, influences the accuracy of measurement result.The electrostatic transducer square-shaped electrode is installed in the outer wall of square pipe and sectional view such as Fig. 2 of inwall.
Charge amplifying circuit is handled the electrostatic transducer original signal, and is most important to the realization of whole apparatus function.Adopt high impedance (to reach 10
12Ohm) amplify chip, signal is realized impedance and back level letter treatment circuit coupling behind the front end charge amplifier.Charge amplifying circuit principle schematic such as Fig. 3, the components and parts inventory sees Table 1.
Table 1 charge amplifying circuit electronic devices and components inventory
| Quantity | | Numbering | Encapsulation | |
| 1 | CA3240 | U1 | DIP8 | |
| 1 | 10pF | Cf | RAD0.4 | |
| 2 | 0.1uF | C2C4 | RAD0.2 | |
| 2 | 0.01uF | C3C5 | RAD0.2 | |
| 1 | 100M | Rf | AXIAL0.4 | |
| 1 | 2.74K | R2 | AXIAL0.4 | |
| 2 | 1N4001 | D1D2 | DIODE0.4 |
Utilize the present invention respectively in the square shaped pipeline freely falling body particle and strength carry subparticle to measure, the correlation method result that tests the speed shows that actual measurement particle speed and particle theoretical reference speed coincide.Actual measurement typical sensors signal such as Fig. 4 (a) are the individual particle signal; Fig. 4 (b) is shown in many particle signal.The related function of respective signal such as Fig. 5 (a) are corresponding to the related function of signal among Fig. 4 (a); Fig. 5 (b) is corresponding to the related function of signal among Fig. 4 (b).
Utilize electrostatic transducer of the present invention and measurement mechanism thereof to realize the measurement of a plurality of parameters of Dual-Phrase Distribution of Gas olid in the square shaped Pneumatic conveying pipeline.If use an electrostatic transducer separately, then measure the solid concentration of Dual-Phrase Distribution of Gas olid in the square pipe, if two electrostatic transducers are used, then measure the solid phase mass rate of Dual-Phrase Distribution of Gas olid in the square pipe and the speed of solid particle.
Claims (4)
1. the measuring method of gas-solid diphasic stream parameter in the square pneumatic conveying pipe, it is characterized in that, this measuring method is that electrostatic transducer (2) reflects that by electrostatic induction solid particle flows through the electric weight of the square-shaped electrode time institute static electrification lotus of electrostatic transducer (2) in square pipe, front end charge amplifier (3) carries out pre-service to the faint induced charge on the square-shaped electrode of electrostatic transducer (2), the while enhancing signal, sensor signal after the pre-service is sent to signal processing circuit (4), finishing signal amplifies, filtering, signal operation, input to data collecting card (5) after signal is regular, data collecting card (5) carries out analog to digital conversion, make and meet the sample frequency requirement, and input computing machine (6), computing machine (6) passes through handling procedure, sampled signal is carried out corresponding analyzing and processing, obtain the relevant parameter of Dual-Phrase Distribution of Gas olid in the square pipe, realize the measurement of gas-solid diphasic stream parameter in the square shaped Pneumatic conveying pipeline.
2. according to the measuring method of gas-solid diphasic stream parameter in the described square pneumatic conveying pipe of claim 1, it is characterized in that, described front end charge amplifier (3) adopts the high impedance that reaches 1012 ohm to amplify chip, signal is realized impedance and back level signal processing circuit coupling behind the front end charge amplifier, front end charge amplifier (3) is handled the electrostatic transducer original signal, and is most important to the realization of entire measuring device function.
3. according to the measuring method of gas-solid diphasic stream parameter in the described square pneumatic conveying pipe of claim 1, it is characterized in that, the axial width of the square-shaped electrode of described electrostatic transducer (2) is the decision parameter of electrostatic transducer performance, electrode is too narrow, the induced signal of electrostatic transducer is too little, measures to be subjected to noise easily; Electrode is too wide, Spatial Filtering Effect is obvious, the frequency band of electrostatic transducer output signal will reduce greatly, because the convolution effect of defiling causes the related function peak region between the upstream and downstream sensor signal smooth, the uncertainty of estimating according to the related function decision transit time increases or the error increase, and then influences the accuracy of measurement result.
4. according to the measuring method of gas-solid diphasic stream parameter in the described square pneumatic conveying pipe of claim 1, it is characterized in that described electrostatic transducer uses a solid concentration of then measuring Dual-Phrase Distribution of Gas olid in the square pipe separately; Two are used, and then measure the solid phase mass rate of Dual-Phrase Distribution of Gas olid in the square pipe and the speed of solid particle.
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| CN200710152036A CN100582682C (en) | 2007-06-27 | 2007-09-27 | Device and method for measuring gas-solid diphasic stream parameter in square pneumatic conveying pipe |
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| CN101839889B (en) * | 2010-05-28 | 2012-09-26 | 东南大学 | Particle velocity distribution arc static sensor array measuring method and device thereof |
| CN102435237B (en) * | 2011-10-27 | 2013-01-02 | 天津大学 | Gas-solid two-phase flow parameter detector |
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| CN102590643A (en) * | 2012-03-07 | 2012-07-18 | 厦门大学 | Gas-solid phase pipe flow static measuring appliance and measuring method |
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| CN106052744B (en) * | 2016-07-13 | 2019-01-04 | 天津大学 | Pipeline airvey system minimum pressure drop speed determination method based on electrostatic transducer |
| CN106124371B (en) * | 2016-08-03 | 2019-03-26 | 西安理工大学 | A kind of Dual-Phrase Distribution of Gas olid fineness measurement device and measurement method based on electrostatic method |
| CN107044865B (en) * | 2016-12-14 | 2019-09-17 | 天津大学 | A kind of minimum pressure drop speed determination method based on electrostatic signal approximate entropy |
| CN110940618B (en) * | 2019-12-10 | 2021-01-15 | 西安交通大学 | Online abrasive particle monitoring system and method based on solid-liquid two-phase fluid coupling electrification |
| CN111562301A (en) * | 2020-02-25 | 2020-08-21 | 天津大学 | Method for online monitoring defects of gas insulation power transmission pipeline |
| CN111381113A (en) * | 2020-02-25 | 2020-07-07 | 天津大学 | Method for measuring induced charge distribution of gas insulation power transmission pipeline |
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