CN103411858A - On-line particle size distribution measuring device and method based on array sonic transducer - Google Patents
On-line particle size distribution measuring device and method based on array sonic transducer Download PDFInfo
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- CN103411858A CN103411858A CN2013103148576A CN201310314857A CN103411858A CN 103411858 A CN103411858 A CN 103411858A CN 2013103148576 A CN2013103148576 A CN 2013103148576A CN 201310314857 A CN201310314857 A CN 201310314857A CN 103411858 A CN103411858 A CN 103411858A
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Abstract
The invention discloses an on-line particle size distribution measuring device and method based on an array sonic transducer, which belongs to the technical scope of gas-solid two-phase flow on-line measurement. The on-line particle size distribution measuring device adopts the structure that a sound emission detection test piece with a plurality of sound emission detecting units is mounted on a gas-solid two-phase flow pipeline, a particle collision vibration member generates a sound emission signal, a piezoelectric film sensor detects the sound emission signal, sound insulation rubber is arranged between the vibration member and the sound emission detection test piece, and an embedded data processing module is adopted to process and analyze the sound emission signal to obtain the particle size distribution information. Each sound emission detecting unit can measure the particle size distribution of particles in the local space, and together with fusion of all local information in a pipeline, the integral particle size distribution of the particles in the pipeline can be obtained, thereby providing measurement data for powder flow behavior research and industrial field on-line diagnosis.
Description
Technical field
The invention belongs to Dual-Phrase Distribution of Gas olid line Measurement Technique scope, particularly a kind of on-line measurement of particle size distribution based on array sonic transducer device and method.
Background technology
Powder granule is that material and product the most common in process industrial exists form, and it extensively is present in a plurality of industrial circles such as medicine, food, chemical industry, metallurgy.The material characteristic of powder can be by density, shape, size, hardness, porosity, a plurality of parameters such as dispersion degree characterize, wherein grain graininess is a kind of important parameter that determines product quality and performances, as the large young pathbreaker of preparation granularity, directly affect the validity of medicine, stability and security, the intensity of cement, mobility, condense closely related with hardening process and powder granularity, in coal-burning boiler, coal powder size is to burning efficiency, combustion stability and pollutant emission have important impact, therefore the Measurement accuracy of grain graininess had to very important realistic meaning.In powder industry, utilize air-flow to realize that powder and granule shape material is a kind of ancient and effective technology in ducted conveying, the on-line measurement of particle flow parameter is conducive to control and the optimization of industrial process.At present, common granulometry method also is difficult to realize the on-line measurement of Pneumatic conveying pipeline endoparticle particle diameter, and as sieve method complex operation, length consuming time, measurement result seriously lags behind, and optical measuring method, to the environmental requirement harshness, is difficult to adapt to industry spot.When powder granule moves in pipeline, can produce acoustic emission signal owing to colliding, rubbing, this signal contains abundant movement of particles information, as speed, concentration, particle diameter etc., by suitable processing and analysis, can realize the on-line measurement of powder flowing parameter.The present invention proposes a kind of on-line measurement of particle size distribution based on array sonic transducer device, a plurality of acoustic emission detection unit that utilization is arranged in flow field realizes that the grain diameter of pipeline section local space measures, by all local messages in pipeline are merged, can obtain the size-grade distribution information of whole pipeline section, thereby provide means of testing for on-line monitoring and the optimal control of industrial process.
Summary of the invention
The purpose of this invention is to provide a kind of on-line measurement of particle size distribution based on array sonic transducer device and method, it is characterized in that, described particle size distribution on-line measurement device is acoustic emission detection to be installed visit sheet on the Dual-Phrase Distribution of Gas olid tube wall, and acoustic emission detection is visited sheet and is inserted in the particle flow field or sticks on inner-walls of duct; Acoustic emission detection is visited on sheet and is distributed with a plurality of acoustic emission detection unit, the acoustic emission detection unit is comprised of vibration component, piezoelectric film sensor and sound insulation rubber, the output signal of acoustic emission detection unit is connected to the embedded data processing module, to realize the particle size distribution measurement of a plurality of local spaces of stream field, obtain particle size distribution information, embedded data processing module output particle size distribution information is for deliberation, diagnosis and control and use.
It is the flat structure that described acoustic emission detection is visited sheet, and its width not stream field causes too large disturbance to be advisable, and this width is the 1-2 millimeter;
Described acoustic emission detection unit is the closed cavity body structure, and its seal cover board is towards the vibration component that carrys out flow path direction, and particle and vibration component collision produce stress wave, i.e. acoustic emission signal; At vibration component, sticked piezoelectric film sensor towards the one side of cavity, to realize the detection to acoustic emission signal; Vibration component and acoustic emission detection are visited between sheet has sound insulation rubber, to realize the isolation to pipe vibration, and avoids crosstalking between the acoustic emission detection unit.
Described acoustic emission detection is visited the sheet inner hollow, wherein embeds a flexible PCB; On flexible PCB, a plurality of and piezoelectric film sensor of carrying closes on the prime amplifier of placement, to realize the amplification nearby to feeble signal; Adopt microencapsulated to meet the requirement of installation dimension.
Described acoustic emission detection is visited sheet and vibration component is made by stainless steel material, and thickness is the 1-2 millimeter, and is coated with pottery to increase wearing quality.
A plurality of acoustic emission detection that described particle size distribution on-line measurement device comprises are visited the space of sheet in pipeline section layout versatile and flexible, adopt respectively three with the acoustic emission detection spy sheet of five parallel distributions, the pipeline flow field to be measured, or adopt the equally distributed acoustic emission detection spy sheets at three groups of 120 degree angles that are separated by measure the pipeline flow field; Or acoustic emission detection is visited to sheet be attached on inner-walls of duct, to realize the measurement to the diverse location particle size distribution.
Described embedded data processing module adopts second amplifying circuit, trap circuit and low-pass filter to nurse one's health signal, because the number of signals of needs collection and processing is more, and algorithm complexity is higher, utilize each IO port of field programmable gate array (FPGA) respectively a plurality of modulus conversion chips to be controlled, with the collection that realizes that multi-Channel Acoustic transmits, utilize its hardware parallel processing capability to realize the real-time processing to acoustic emission signal.
The described On-line Measuring Method of particle size distribution based on the array sonic transducer, is characterized in that, the method comprises:
1), by particle collision, acoustic emission signal conduction are carried out to physical modeling and simulation analysis with receiving course, obtain particle speed, concentration, particle diameter, material character and comprise the relation of the sensor response signal feature of average level, peak amplitude, rise time, Ring-down count and power spectrum density; Utilize each acoustic emission detection unit to measure the particle size distribution of its local space of living in, by all local messages in pipeline are merged, the overall particle size that obtains particle in pipeline distributes;
2) when granule density is low, individual pulse is carried out to characteristic parameter extraction, obtain the grain diameter of single collision;
3) acquire a certain degree and can't differentiate individual pulse the time when granule density, take the signal processing method of spectrum analysis, wavelet analysis to obtain the statistical distribution of grain diameter.
The invention has the beneficial effects as follows: adopt passive Acoustic detection technology to realize the on-line continuous measurement of particle size distribution, and adopt distributed sensing to obtain the local size-grade distribution information in particle flow field, thereby can be the scientific research of powder flowing characteristic and rule, and industry spot on-line continuous measurement powder flowing parameter provides detailed data.
The accompanying drawing explanation
Fig. 1 is the theory structure schematic diagram of particle size distribution on-line measurement device.
In figure: 1. Dual-Phrase Distribution of Gas olid pipeline; 2. acoustic emission detection is visited sheet; 3. acoustic emission detection unit; 4. embedded data processing module.
Fig. 2 is acoustic emission detection unit theory structure schematic diagram.
In figure: 5 is vibration component; 6 is powder granule; 7 is piezoelectric film sensor; 8 are sound insulation rubber.
Fig. 3 is the multiple space layout form that acoustic emission detection is visited sheet.
Embodiment
The invention provides a kind of on-line measurement of particle size distribution based on array sonic transducer device and method.Below in conjunction with drawings and Examples, the present invention is explained as follows:
Figure 1 shows that the theory structure schematic diagram of particle size distribution on-line measurement device.In figure, in Dual-Phrase Distribution of Gas olid pipeline 1, insert acoustic emission detection and visit sheet 2, acoustic emission detection is visited sheet 2 and is immersed in the particle flow field; Acoustic emission detection is visited sheet 2 inner hollow, and acoustic emission detection is visited on sheet 2 and is distributed with a plurality of acoustic emission detection unit 3; The acoustic emission detection unit is comprised of vibration component 5, piezoelectric film sensor 7 and sound insulation rubber 8, the output signal of acoustic emission detection unit is connected to embedded data processing module 4, to realize the particle size distribution measurement of a plurality of local spaces of stream field, obtain particle size distribution information, embedded data processing module 4 output particle size distribution information are for deliberation, diagnosis and control and use.Wherein the embedded data processing module adopts second amplifying circuit, trap circuit and low-pass filter to nurse one's health signal, because the number of signals of needs collection and processing is more, and algorithm complexity, utilize each IO port of field programmable gate array (FPGA) respectively a plurality of modulus conversion chips to be controlled, with the collection that realizes that multi-Channel Acoustic transmits, utilize its hardware parallel processing capability to realize the real-time processing to acoustic emission signal.
Figure 2 shows that acoustic emission detection spy sheet theory structure schematic diagram.Described acoustic emission detection is visited sheet 2 and is had cavity body structure, and vibration component 5 is embedded in this cavity body structure, between vibration component 5 and acoustic emission detection spy sheet 2, has sound insulation rubber 8, to realize the sound isolation; Powder granule 6 is driven with vibration component 5 and is produced collision by air-flow, produces stress wave, i.e. acoustic emission signal in collision place; At vibration component 5, sticked piezoelectric film sensor 7 towards the one side of cavity,, can realize the detection to acoustic emission signal.Wherein, described vibration component 5 is made by stainless steel material, and is coated with pottery to increase wearing quality.
Figure 3 shows that the multiple space layout form of acoustic emission detection spy sheet.The difference required according to measuring position, precision etc., can arrange flexibly to quantity and the mounting means that acoustic emission detection is visited sheet.Fig. 3 (1) is depicted as and adopts single acoustic emission detection spy sheet to measure the flow field at pipeline middle part; Fig. 3 (2) with (3) for adopting respectively three spy sheets parallel with five to measure the pipeline flow field; Fig. 3 (4) measures the pipeline flow field for the equally distributed short spy sheet that adopts three groups of 120 degree angles that are separated by; Fig. 3 (5) sticks in inner-walls of duct and comes stream field to measure for visiting sheet.
The particle size distribution On-line Measuring Method that the present invention is based on the array sonic transducer is that particle 6 and the acoustic emission signal that vibration component 5 collisions produce are detected, by signal being processed and being analyzed the size-grade distribution information that obtains.The factor analysis such as the detected sound emission signal characteristic of piezoelectric film sensor 7 and particle speed, concentration, particle diameter, material character, by particle collision, acoustic emission signal conduction are carried out to physical modeling and simulation analysis with receiving course, can obtain above-mentioned correlationship.When granule density is lower, the single collision is when distinguishable, can extract features such as the peak amplitude of individual pulse, rise time, obtains the grain diameter of single collision; When granule density acquires a certain degree and can't distinguish individual pulse the time, can take the signal processing methods such as spectrum analysis, wavelet analysis to obtain the statistical distribution of grain diameters.The particle size distribution of its local space of living in can be measured in each acoustic emission detection unit 3, and by the interior all local messages of pipeline 1 are merged, the overall particle size that can obtain particle in pipeline distributes.
Claims (8)
1. the on-line measurement of the particle size distribution based on array sonic transducer device, it is characterized in that, described particle size distribution on-line measurement device is acoustic emission detection to be installed visit sheet on the Dual-Phrase Distribution of Gas olid tube wall, and acoustic emission detection is visited sheet and is inserted in the particle flow field or sticks on inner-walls of duct; Acoustic emission detection is visited on sheet and is distributed with a plurality of acoustic emission detection unit, the acoustic emission detection unit is comprised of vibration component, piezoelectric film sensor and sound insulation rubber, the output signal of acoustic emission detection unit is connected to the embedded data processing module, to realize the particle size distribution measurement of a plurality of local spaces of stream field, obtain particle size distribution information, embedded data processing module output particle size distribution information is for deliberation, diagnosis and control and use.
2. according to claim 1 based on the particle size distribution on-line measurement device of array sonic transducer, it is characterized in that, it is the flat structure that described acoustic emission detection is visited sheet, and its width not stream field causes too large disturbance to be advisable, and this width is the 1-2 millimeter.
3. according to claim 1 based on the particle size distribution on-line measurement device of array sonic transducer, it is characterized in that, described acoustic emission detection unit is the closed cavity body structure, its seal cover board is towards the vibration component that carrys out flow path direction, particle and vibration component collision produce stress wave, i.e. acoustic emission signal; At vibration component, sticked piezoelectric film sensor towards the one side of cavity, to realize the detection to acoustic emission signal; Vibration component and acoustic emission detection are visited between sheet has sound insulation rubber, to realize the isolation to pipe vibration, and avoids crosstalking between the acoustic emission detection unit.
4. according to claim 1 based on the particle size distribution on-line measurement device of array sonic transducer, it is characterized in that, described acoustic emission detection is visited the sheet inner hollow, wherein embeds a flexible PCB; On flexible PCB, a plurality of and piezoelectric film sensor of carrying closes on the prime amplifier of placement, to realize the amplification nearby to feeble signal; Adopt microencapsulated to meet the requirement of installation dimension.
5. according to claim 1 based on the particle size distribution on-line measurement device of array sonic transducer, it is characterized in that, described acoustic emission detection is visited sheet and vibration component is made by stainless steel material, and thickness is the 1-2 millimeter, and is coated with pottery to increase wearing quality.
6. according to claim 1 based on the particle size distribution on-line measurement device of array sonic transducer, it is characterized in that, described particle size distribution on-line measurement device is that a plurality of acoustic emission detection are visited the space of sheet in pipeline section layout versatile and flexible, adopt respectively three with the acoustic emission detection spy sheet of five parallel distributions, the pipeline flow field to be measured, or adopt the equally distributed acoustic emission detection spy sheets at three groups of 120 degree angles that are separated by measure the pipeline flow field; Or acoustic emission detection is visited to sheet be attached on inner-walls of duct, to realize the measurement to the diverse location particle size distribution.
7. according to claim 1 based on the particle size distribution on-line measurement device of array sonic transducer, it is characterized in that, described embedded data processing module adopts second amplifying circuit, trap circuit and low-pass filter to nurse one's health signal, because the number of signals of needs collection and processing is more, and algorithm complexity, utilize each IO port of field programmable gate array respectively a plurality of modulus conversion chips to be controlled, with the collection that realizes that multi-Channel Acoustic transmits, utilize its hardware parallel processing capability to realize the real-time processing to acoustic emission signal.
8. the measuring method of the described on-line measurement of particle size distribution based on the array sonic transducer of claim 1 device, is characterized in that, the method comprises:
1), by particle collision, acoustic emission signal conduction are carried out to physical modeling and simulation analysis with receiving course, obtain particle speed, concentration, particle diameter, material character and comprise the relation of the sensor response signal feature of average level, peak amplitude, rise time, Ring-down count and power spectrum density; Utilize each acoustic emission detection unit to measure the particle size distribution of its local space of living in, by all local messages in pipeline are merged, the overall particle size that obtains particle in pipeline distributes;
2) when granule density is low, individual pulse is carried out to characteristic parameter extraction, obtain the grain diameter of single collision;
3) acquire a certain degree and can't differentiate individual pulse the time when granule density, take the signal processing method of spectrum analysis, wavelet analysis to obtain the statistical distribution of grain diameter.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20150247823A1 (en) * | 2012-09-14 | 2015-09-03 | Korea Electric Power Corporation | Pipeline inspection device and pipeline inspection system |
| CN114252377A (en) * | 2021-12-28 | 2022-03-29 | 聪明猪检测技术(成都)有限公司 | Method and system for detecting particle content in pipeline medium based on multiple sensors |
| CN115683959A (en) * | 2022-11-03 | 2023-02-03 | 北京信息科技大学 | Biomass power generation fuel particle size identification system and method based on collision sound characteristics |
| WO2023140260A1 (en) * | 2022-01-20 | 2023-07-27 | Ｊｆｅスチール株式会社 | Particle size estimation method and particle size estimation device |
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Patent Citations (4)
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| CN1143184A (en) * | 1995-08-14 | 1997-02-19 | 日本碍子株式会社 | Sensor element and particle sensor |
| US7213475B2 (en) * | 2000-06-28 | 2007-05-08 | Common Wealth Scientific And Industrial Research Organisation | Measurements of particle size in pneumatic flows |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20150247823A1 (en) * | 2012-09-14 | 2015-09-03 | Korea Electric Power Corporation | Pipeline inspection device and pipeline inspection system |
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| CN114252377B (en) * | 2021-12-28 | 2024-05-03 | 聪明猪检测技术(成都)有限公司 | Method and system for detecting particle content in pipeline medium based on multiple sensors |
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| CN115683959A (en) * | 2022-11-03 | 2023-02-03 | 北京信息科技大学 | Biomass power generation fuel particle size identification system and method based on collision sound characteristics |
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