CN102608005B - 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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- CN102608005B CN102608005B CN201210073200.0A CN201210073200A CN102608005B CN 102608005 B CN102608005 B CN 102608005B CN 201210073200 A CN201210073200 A CN 201210073200A CN 102608005 B CN102608005 B CN 102608005B
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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 current industrial processes, is widely used in the pellet of various industrial sectors, conveying and the drying process of powder.Exemplary is that in fuel-burning power plant, solid fuel is carried as the pipeline of coal dust etc.Carry and supply with many conveyance conduits simultaneously by pressurized air from coal pulverizer coal dust out, then enter burner array at stove chamber inner combustion.The distribution of characteristics of coal powder and the efficiency of burning and pollutant discharge amount have close contacting.But the serviceability of coal pulverizer and the physical characteristics of coal etc. are depended in the distribution of characteristics of coal powder.In recent years, the coal-burning power plant of countries in the world starts to adopt coal dust and living beings burning technology altogether, to reduce the discharge of carbon dioxide.Many power plant all adopt generating power with biomass combustion.Many living beings are as larger than pulverized coal particle in stalk etc., and therefore 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., when serious, can cause line clogging, 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 to on-line continuous detection, contribute to improve security and the burning efficiency of boiler combustion, reduce pollutant emission.In existing online the Measurement of Grain Granularity, comparative maturity have an optical imagery method, but exist camera lens easily to pollute and complicated shortcoming be installed.The present invention proposes the grain graininess on-line detecting system based on piezoelectric sensor, is the piezoelectric effect of utilizing piezoelectric, collision machine can be converted to electric energy, more further become size-grade distribution by the model conversation of crash dynamics modeling.
Summary of the invention
The object 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, the described 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 provided with piezoelectric sensor 4, and signal regulating panel and data acquisition module 5 are fixed together and are encapsulated in system in package 6 with piezoelectric sensor 4; Signal processing system 7 is connected with signal regulating panel and data acquisition module 5.
Described collision sensing probe shape is designed to V-type, and the angle [alpha] between inducing probes inclined-plane and cross-section of pipeline is 40 ° to 50 °, makes bounce-back particle after collision sensing probe not hinder the motion of fluid.
The length of described collision sensing probe is 1/3rd to 2/3rds of pipe diameter.
The V-type impingement area of described collision sensing probe is made up of stainless steel, and is coated with pottery to increase wearing quality.
Described piezoelectric sensor is piezoelectric ceramics or piezoelectric membrane, the object using to reach long-time continuous.
Described signal processing system is by colliding granularity model and user interface forms; 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 described particle size distribution On-line Measuring Method based on piezoelectric sensor is that the signal being collided by particle is transferred to piezoelectric sensor 4 by the collision sensing probe 3 that inserts Dual-Phrase Distribution of Gas olid pipeline 1 middle part, piezoelectric sensor 4 is input to signal processing system 7 by 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 by user interface; Wherein, the relation between intensity and the grain graininess of collision alarm is by following model:
Wherein, the intensity that V is collision alarm, h is piezoelectric thickness, S is induction area, g
33for piezoelectric voltage constant, K is the collision constant of collision material, and v is particle speed, and d is grain graininess; Piezoelectric sensor parameter h, S and g
33determined by piezoelectric used; Collision constant K is determined by system calibrating; Particle speed v estimates by measuring gas velocity; In real-time monitoring system, the size-grade distribution of particle is presented in user interface, when the particle number in user interface is accumulated to while having statistical significance number, by the statistical information output of whole user interface, and carry out Data Update according to the particle information newly entering, thereby realize on-line real time monitoring.
Beneficial effect of the present invention is: the present invention has adopted the distribution of grain graininess in induction Real-Time Monitoring Dual-Phrase Distribution of Gas olid pipeline simple in structure, that volume is little, lightweight and the easy piezoelectric sensor of installation collides molecule; This piezoelectric sensor directly obtains collision alarm, reduces the impact of ground unrest on collision alarm; Secondly, utilize crash dynamics principle to set up the mathematical model of collision alarm and granularity, obtain the size-grade distribution of tested particle in pipeline.
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. 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 collision sensing probe schematic diagram.
Embodiment
The invention provides a kind of particle size distribution on-line measurement device and method based on piezoelectric sensor.Below in conjunction with drawings and Examples to of the present invention be explained as follows;
Figure 1 shows that the theory structure schematic diagram of particle size distribution on-line measurement device.In 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 provided with piezoelectric sensor 4, and this piezoelectric sensor 4 is made for piezoelectric ceramics or piezoelectric membrane, the object using to reach long-time continuous.Signal regulating panel and data acquisition module 5 are fixed together and are encapsulated in system in package 6 with piezoelectric sensor 4; Signal processing system 7 is connected with signal regulating panel and data acquisition module 5.Wherein, described collision sensing probe shape is designed to V-type, angle [alpha] between inducing probes inclined-plane and cross-section of pipeline is 40 ° to 50 ° (as shown in Figure 2), and made 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 after collision sensing probe not hinder the motion of fluid.
Described signal processing system is by colliding granularity model and user interface forms; 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 signal being collided by particle is transferred to piezoelectric sensor 4 by the collision sensing probe 3 that inserts Dual-Phrase Distribution of Gas olid pipeline 1 middle part, piezoelectric sensor 4 is input to signal processing system 7 by 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 by user interface; Wherein, the relation between intensity and the grain graininess of collision alarm is by following model:
Wherein, the intensity that V is collision alarm, h is piezoelectric thickness, S is induction area, g
33for piezoelectric voltage constant, K is the collision constant of collision material, and v is particle speed, and d is grain graininess; Piezoelectric sensor parameter h, S and g
33determined by piezoelectric used; Collision constant K is determined by system calibrating; Particle speed v estimates by measuring gas velocity; In real-time monitoring system, the size-grade distribution of particle is presented in user interface, when the particle number in user interface is accumulated to while having statistical significance number, by the statistical information output of whole user interface, and carry out Data Update according to the particle information newly entering, thereby realize on-line real time monitoring.Plant the particle size distribution on-line continuous measurement mechanism based on piezoelectric sensor.
Claims (4)
1. the particle size distribution on-line measurement device based on piezoelectric sensor, the described 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 provided with piezoelectric sensor (4), and signal processing system (7) is connected with signal regulating panel and data acquisition module (5); It is characterized in that, signal regulating panel and data acquisition module (5) are fixed together and are encapsulated in system in package (6) with piezoelectric sensor (4); Described collision sensing probe shape is designed to V-type, and the angle [alpha] between inducing probes inclined-plane and cross-section of pipeline is 40 ° to 50 °, makes to collide bounce-back particle after collision sensing probe and do not hinder the motion of fluid.
2. the particle size distribution on-line measurement device based on piezoelectric sensor according to claim 1, is characterized in that, the V-type impingement area of described collision sensing probe is made up of stainless steel, and is coated with pottery to increase wearing quality.
3. the particle size distribution on-line measurement device based on piezoelectric sensor according to claim 1, is characterized in that, described piezoelectric sensor is piezoelectric ceramics or piezoelectric membrane, the object using to reach long-time continuous.
4. the particle size distribution On-line Measuring Method based on piezoelectric sensor, it is characterized in that, the method is that the signal being collided by particle is transferred to piezoelectric sensor (4) by the collision sensing probe (3) that inserts Dual-Phrase Distribution of Gas olid pipeline (1) middle part, piezoelectric sensor (4) is input to signal processing system (7) by 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 show by user interface, wherein, the relation between intensity and the grain graininess of collision alarm is by following model:
Wherein, the intensity that V is collision alarm, h is piezoelectric thickness, S is induction area, g
33for piezoelectric voltage constant, K is the collision constant of collision material, and υ is particle speed, and d is grain graininess; Piezoelectric sensor parameter h, S and g
33determined by piezoelectric used; Collision constant K is determined by system calibrating; Particle speed υ estimates by measuring gas velocity; In real-time monitoring system, the size-grade distribution of particle is presented in user interface, when the particle number in user interface is accumulated to while having statistical significance number, by the statistical information output of whole user interface, and carry out Data Update according to the particle information newly entering, thereby realize on-line real time monitoring.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102854099B (en) * | 2012-09-17 | 2014-10-08 | 华北电力大学 | Automatic online detecting method for large-size particles in pneumatic conveying pipeline |
| 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 |
| CN105403634B (en) * | 2015-11-10 | 2018-02-13 | 国家海洋局第三海洋研究所 | It is a kind of to be used for the online fine grained harvester directly surveyed and method |
| US10698427B2 (en) | 2016-10-31 | 2020-06-30 | Ge Oil & Gas Pressure Control Lp | System and method for assessing sand flow rate |
| CN106940286A (en) * | 2017-04-21 | 2017-07-11 | 北京航空航天大学 | Particle concentration detection means |
| 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 |
| CN115683959B (en) * | 2022-11-03 | 2023-07-14 | 北京信息科技大学 | System and method for identifying particle size of biomass particles based on collision sound characteristics |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB1254493A (en) * | 1969-07-01 | 1971-11-24 | Coal Industry Patents Ltd | Determining particles size |
| US4212190A (en) * | 1978-12-18 | 1980-07-15 | Research Triangle Institute | Acoustical particle detector and method |
| SU819630A1 (en) * | 1979-06-20 | 1981-04-07 | Предприятие П/Я А-7113 | Piezoelectric method of analyzing aerosol particle-size content |
| SU1167480A1 (en) * | 1981-05-28 | 1985-07-15 | Центральный Ордена Трудового Красного Знамени Научно-Исследовательский Автомобильный И Автомоторный Институт | Device for measuring concentration and dispersity of dust particles in gas flow |
| DE3412615C2 (en) * | 1984-04-04 | 1986-07-24 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., 8000 München | Method for determining the grain size in a polycrystalline material |
| AUPQ841500A0 (en) * | 2000-06-28 | 2000-07-20 | Commonwealth Scientific And Industrial Research Organisation | Measurement of particle size in pneumatic flows |
| CN2752755Y (en) * | 2004-10-15 | 2006-01-18 | 南京大陆中电科技股份有限公司 | Powder coal fineness on-line detector |
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