CN102608005A - Piezoelectric sensor-based on-line measurement device and method for particle size distribution - Google Patents
Piezoelectric sensor-based on-line measurement device and method for particle size distribution Download PDFInfo
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- CN102608005A CN102608005A CN2012100732000A CN201210073200A CN102608005A CN 102608005 A CN102608005 A CN 102608005A CN 2012100732000 A CN2012100732000 A CN 2012100732000A CN 201210073200 A CN201210073200 A CN 201210073200A CN 102608005 A CN102608005 A CN 102608005A
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Abstract
The invention discloses a piezoelectric sensor-based on-line measurement device and method for particle size distribution, which belong to the field of gas-solid two-phase flow on-line measurement technique. The on-line measurement device is characterized in that: a collision induction probe is inserted in the middle of a gas-solid two-phase flow pipeline; a piezoelectric sensor is arranged on the collision induction probe; a signal conditioning plate and a data acquisition module are connected with the piezoelectric sensor and a signal processing system; when solid particles are collided with the collision induction probe, the piezoelectric sensor senses a particle collision signal and sends the particle collision signal to the signal conditioning plate and the data acquisition module; and the particle size distribution is obtained through signal processing software and a collision particle model. The device has the characteristic that the piezoelectric sensor is utilized to obtain the collision signal of small particle collision directly so as to realize real-time monitoring on the particle size distribution; the influence of background noise on the collision signal is reduced; and a collision dynamics principle is utilized to build a mathematical model of the collision signal and the particle size, so that the size distribution of measured particles in the pipeline is obtained.
Description
Technical field
The invention belongs to Dual-Phrase Distribution of Gas olid line Measurement Technique scope, particularly a kind of particle size distribution on-line measurement device and method based on piezoelectric sensor.
Background technology
It is a kind of effective ways that utilize air-flow conveying granular solid in pipeline that strength is carried, and is an important technology in the present industrial processes, is widely used in the pellet of various industrial sectors, the conveying and the drying process of powder.An exemplary is the pipeline transportation of solid fuel such as coal dust etc. in the fuel-burning power plant.The coal dust that comes out from coal pulverizer is carried by pressurized air supplies with many conveyance conduits simultaneously, gets into the burner array then in the burner hearth internal combustion.The distribution of pulverized coal particle granularity and the efficient of burning and pollutant discharge amount have close getting in touch.Yet the serviceability of coal pulverizer and the physical characteristics of coal etc. are depended in the distribution of pulverized coal particle granularity.In recent years, the coal-burning power plant of countries in the world begins to adopt coal dust and living beings burning technology altogether, to reduce emission of carbon-dioxide.Many power plant all adopt generating power with biomass combustion.Many living beings such as stalk etc. are bigger than pulverized coal particle, so biomass combustion or coal dust and living beings are burnt altogether with pure coal dust firing and are very different.The burning of bulky grain and irregular fuel particle can directly have influence on the discharge capacity of burning efficiency and pollutant.Fuel granularity is excessive or cross detailed rules and regulations and can cause incomplete combustion or the increase of coal pulverizer energy consumption etc., can cause line clogging when serious, by forced-stopping machine, causes heavy losses to power plant.Therefore, the particle size distribution of power plant's coal dust and living beings is carried out on-line continuous detect, help to improve the security and the burning efficiency of boiler combustion, reduce pollutant emission.In conventional online grain graininess detection technique, comparative maturity the optical imagery method arranged, but exist camera lens to be prone to pollute and install complicated shortcoming.The present invention proposes the grain graininess on-line detecting system based on piezoelectric sensor, is the piezoelectric effect of utilizing piezoelectric, can convert collision machine into electric energy, and further the model conversation through the crash dynamics modeling becomes size-grade distribution again.
Summary of the invention
The purpose of this invention is to provide a kind of particle size distribution on-line measurement device and method based on piezoelectric sensor; It is characterized in that; Said particle size distribution on-line measurement device based on piezoelectric sensor is to insert collision sensing probe 3 at the middle part of Dual-Phrase Distribution of Gas olid pipeline 1, and collision sensing probe 3 is at 2 middle parts, particle flow field; Collision sensing probe 3 ends are equipped with piezoelectric sensor 4, and signal regulating panel and data acquisition module 5 are fixed together with piezoelectric sensor 4 and are encapsulated in the system in package 6; Signal processing system 7 is connected with data acquisition module 5 with signal regulating panel.
Said collision sensing probe shape is designed to V-type, and the angle [alpha] between inducing probes inclined-plane and the cross-section of pipeline is 40 ° to 50 °, makes bounce-back particle behind the collision sensing probe not hinder the motion of fluid.
The length of said collision sensing probe is 1/3rd to 2/3rds of pipe diameter.
The V-type impingement area of said collision sensing probe is processed by stainless steel, and is coated with pottery to increase wearing quality.
Said piezoelectric sensor is piezoelectric ceramics or piezoelectric membrane, to reach the purpose that long-time continuous is used.
Said signal processing system is made up of collision granularity model and user interface; Signal processing system obtains utilizing the mathematical model of collision alarm and granularity and then obtaining the endocorpuscular size-grade distribution of pipeline after the intensity of collision alarm.
Said particle size distribution On-line Measuring Method based on piezoelectric sensor is that the collision sensing probe 3 that inserts Dual-Phrase Distribution of Gas olid pipeline 1 middle part will be transferred to piezoelectric sensor 4 by the signal of impact of particles; Piezoelectric sensor 4 is input to signal processing system 7 through signal regulating panel and data acquisition module 5 and carries out Treatment Analysis; Obtain the intensity of collision alarm; Signal processing system 7 is utilized the mathematical model of collision alarm and granularity and then is obtained the endocorpuscular size-grade distribution of pipeline, and shows through user interface; Wherein, the intensity of collision alarm and the relation between the grain graininess are by providing like drag:
Wherein, V is the intensity of collision alarm, and h is a piezoelectric thickness, and S is an induction area, g
33Be piezoelectric voltage constant, K is the collision constant of collision material, and v is a particle speed, and d is a grain graininess; Piezoelectric sensor parameter h, S and g
33Confirm by used piezoelectric; The collision constant K is confirmed through system calibrating; Particle speed v estimates through measuring gas velocity; In real-time monitoring system; The size-grade distribution of particle is presented in the user interface, when the particle number in the user interface is accumulated to when having the statistical significance number, with the statistical information output of whole user interface; And carry out Data Update, thereby realize on-line real time monitoring according to the particle information that newly advances.
Beneficial effect of the present invention is: the present invention has adopted distribution simple in structure, that volume is little, grain graininess in the Dual-Phrase Distribution of Gas olid pipeline is monitored in induction in light weight and that the easy piezoelectric sensor of installation collides molecule in real time; This piezoelectric sensor directly obtains collision alarm, reduces the influence of ground unrest to collision alarm; Secondly, utilize the crash dynamics principle to set up the mathematical model of collision alarm and granularity, obtain the size-grade distribution of tested particle in the pipeline.
Description of drawings
Fig. 1 is the theory structure synoptic diagram of particle size distribution on-line measurement device.
Among the figure: 1. Dual-Phrase Distribution of Gas olid pipeline, 2. particle flow field, 3. collision sensing probe, 4. piezoelectric sensor, 5. signal regulating panel and data acquisition module, 6. system in package, 7. signal processing system.
Fig. 2 is a collision sensing probe synoptic diagram.
Embodiment
The present invention provides a kind of particle size distribution on-line measurement device and method based on piezoelectric sensor.Explain as follows of the present invention below in conjunction with accompanying drawing and embodiment;
Shown in Figure 1 is the theory structure synoptic diagram of particle size distribution on-line measurement device.Among the figure, insert collision sensing probe 3 at the middle part of Dual-Phrase Distribution of Gas olid pipeline 1, collision sensing probe 3 is at 2 middle parts, particle flow field; The length of collision sensing probe is 1/3rd to 2/3rds of pipe diameter.Collision sensing probe 3 ends are equipped with piezoelectric sensor 4, and this piezoelectric sensor 4 is processed for piezoelectric ceramics or piezoelectric membrane, to reach the purpose that long-time continuous is used.Signal regulating panel and data acquisition module 5 are fixed together with piezoelectric sensor 4 and are encapsulated in the system in package 6; Signal processing system 7 is connected with data acquisition module 5 with signal regulating panel.Wherein, Said collision sensing probe shape is designed to V-type; Angle [alpha] between inducing probes inclined-plane and the cross-section of pipeline is 40 ° to 50 ° (as shown in Figure 2); And process by stainless steel at the V-type impingement area of collision sensing probe, and be coated with pottery to increase wearing quality, make bounce-back particle behind the collision sensing probe not hinder the motion of fluid.
Said signal processing system is made up of collision granularity model and user interface; Signal processing system obtains utilizing the mathematical model of collision alarm and granularity and then obtaining the endocorpuscular size-grade distribution of pipeline after the intensity of collision alarm.
The particle size distribution On-line Measuring Method that the present invention is based on piezoelectric sensor is that the collision sensing probe 3 that inserts Dual-Phrase Distribution of Gas olid pipeline 1 middle part will be transferred to piezoelectric sensor 4 by the signal of impact of particles; Piezoelectric sensor 4 is input to signal processing system 7 through signal regulating panel and data acquisition module 5 and carries out Treatment Analysis; Obtain the intensity of collision alarm; Signal processing system 7 is utilized the mathematical model of collision alarm and granularity and then is obtained the endocorpuscular size-grade distribution of pipeline, and shows through user interface; Wherein, the intensity of collision alarm and the relation between the grain graininess are by providing like drag:
Wherein, V is the intensity of collision alarm, and h is a piezoelectric thickness, and S is an induction area, g
33Be piezoelectric voltage constant, K is the collision constant of collision material, and v is a particle speed, and d is a grain graininess; Piezoelectric sensor parameter h, S and g
33Confirm by used piezoelectric; The collision constant K is confirmed through system calibrating; Particle speed v estimates through measuring gas velocity; In real-time monitoring system; The size-grade distribution of particle is presented in the user interface, when the particle number in the user interface is accumulated to when having the statistical significance number, with the statistical information output of whole user interface; And carry out Data Update, thereby realize on-line real time monitoring according to the particle information that newly advances.Plant particle size distribution on-line continuous measurement mechanism based on piezoelectric sensor.
Claims (7)
1. particle size distribution on-line measurement device based on piezoelectric sensor; It is characterized in that; Said particle size distribution on-line measurement device based on piezoelectric sensor is to insert collision sensing probe (3) at the middle part of Dual-Phrase Distribution of Gas olid pipeline (1), and collision sensing probe (3) is at particle flow field (2) middle part; Collision sensing probe (3) end is equipped with piezoelectric sensor (4), and signal regulating panel and data acquisition module (5) are fixed together with piezoelectric sensor (4) and are encapsulated in the system in package (6); Signal processing system (7) is connected with data acquisition module (5) with signal regulating panel.
2. according to the said particle size distribution on-line measurement device of claim 1 based on piezoelectric sensor; It is characterized in that; Said collision sensing probe shape is designed to V-type; Angle [alpha] between inducing probes inclined-plane and the cross-section of pipeline is 40 ° to 50 °, makes bounce-back particle behind the collision sensing probe not hinder the motion of fluid.
3. according to the said particle size distribution on-line measurement device of claim 1, it is characterized in that the length of said collision sensing probe is 1/3rd to 2/3rds of pipe diameter based on piezoelectric sensor.
4. according to the said particle size distribution on-line measurement device of claim 1, it is characterized in that the V-type impingement area of said collision sensing probe is processed by stainless steel, and be coated with pottery to increase wearing quality based on piezoelectric sensor.
5. according to the said particle size distribution on-line measurement device of claim 1, it is characterized in that said piezoelectric sensor is piezoelectric ceramics or piezoelectric membrane, to reach the purpose that long-time continuous is used based on piezoelectric sensor.
6. according to the said particle size distribution on-line measurement device of claim 1, it is characterized in that said signal processing system is made up of collision granularity model and user interface based on piezoelectric sensor; Signal processing system obtains utilizing the mathematical model of collision alarm and granularity and then obtaining the endocorpuscular size-grade distribution of pipeline after the intensity of collision alarm.
7. particle size distribution On-line Measuring Method based on piezoelectric sensor; It is characterized in that; This method is that the collision sensing probe (3) that inserts Dual-Phrase Distribution of Gas olid pipeline (1) middle part will be transferred to piezoelectric sensor (4) by the signal of impact of particles; Piezoelectric sensor (4) is input to signal processing system (7) through signal regulating panel and data acquisition module (5) and carries out Treatment Analysis; Obtain the intensity of collision alarm, signal processing system (7) is utilized the mathematical model of collision alarm and granularity and then is obtained the endocorpuscular size-grade distribution of pipeline, and shows through user interface; Wherein, the intensity of collision alarm and the relation between the grain graininess are by providing like drag:
Wherein, v is the intensity of collision alarm, and h is a piezoelectric thickness, and S is an induction area, g
33Be piezoelectric voltage constant, K is the collision constant of collision material, and v is a particle speed, and d is a grain graininess; Piezoelectric sensor parameter h, S and g
33Confirm by used piezoelectric; The collision constant K is confirmed through system calibrating; Particle speed v estimates through measuring gas velocity; In real-time monitoring system; The size-grade distribution of particle is presented in the user interface, when the particle number in the user interface is accumulated to when having the statistical significance number, with the statistical information output of whole user interface; And carry out Data Update, thereby realize on-line real time monitoring according to the particle information that newly advances.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102854099A (en) * | 2012-09-17 | 2013-01-02 | 华北电力大学 | Automatic online detecting method for large-size particles in pneumatic conveying pipeline |
| CN104816948A (en) * | 2015-04-30 | 2015-08-05 | 华北电力大学 | Pneumatic transmission power parameter measurement optical probe anti-fouling device |
| CN105403634A (en) * | 2015-11-10 | 2016-03-16 | 国家海洋局第三海洋研究所 | Fine-particulate acquisition device and fine-particulate acquisition method used for online direction measurement |
| CN106940286A (en) * | 2017-04-21 | 2017-07-11 | 北京航空航天大学 | Particle concentration detection means |
| CN109406329A (en) * | 2017-08-17 | 2019-03-01 | 中国石油化工股份有限公司 | Measure the suspension method of fluid-bed heat exchanger tubulation endoparticle distribution |
| US10698427B2 (en) | 2016-10-31 | 2020-06-30 | Ge Oil & Gas Pressure Control Lp | System and method for assessing sand flow rate |
| 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102854099A (en) * | 2012-09-17 | 2013-01-02 | 华北电力大学 | Automatic online detecting method for large-size particles in pneumatic conveying pipeline |
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| CN104816948B (en) * | 2015-04-30 | 2017-10-24 | 华北电力大学 | A kind of optic probe anti-fouler measured for Geldart-D particle powder parameters |
| CN105403634A (en) * | 2015-11-10 | 2016-03-16 | 国家海洋局第三海洋研究所 | Fine-particulate acquisition device and fine-particulate acquisition method used for online direction measurement |
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| CN109406329A (en) * | 2017-08-17 | 2019-03-01 | 中国石油化工股份有限公司 | Measure the suspension method of fluid-bed heat exchanger tubulation endoparticle distribution |
| CN109406329B (en) * | 2017-08-17 | 2021-08-03 | 中国石油化工股份有限公司 | Suspension method for measuring particle distribution in tube of fluidized bed heat exchanger |
| 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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