CN103047932A - Device and method for measuring size and movement speed of bubbles in concentrated phase gas-solid fluidized bed - Google Patents
Device and method for measuring size and movement speed of bubbles in concentrated phase gas-solid fluidized bed Download PDFInfo
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- CN103047932A CN103047932A CN2012105506523A CN201210550652A CN103047932A CN 103047932 A CN103047932 A CN 103047932A CN 2012105506523 A CN2012105506523 A CN 2012105506523A CN 201210550652 A CN201210550652 A CN 201210550652A CN 103047932 A CN103047932 A CN 103047932A
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Abstract
The invention relates to a device and a method for measuring the size and the movement speed of bubbles in a concentrated phase gas-solid fluidized bed, belonging to devices and methods for measuring movement behaviors of bubbles. The device comprises a gas-solid fluidized bed, a diffuser chamber, an airflow distributing plate, a high-speed dynamic camera, a data signal display and a data acquisition output and storage device. A high-density magnetite powder medium solid is stood in a gas-solid fluidized bed body, compressed air is diffused to generate uniform and stable bubble flows in the fluidized bed, the high-speed dynamic camera arranged on the front part of the fluidized bed is regulated to capture movement images of the bubbles penetrating through some bed plane, image information is immediately displayed on the data signal display and is continuously transmitted to the data acquisition output and storage device, and then effective data of the size and the movement speed of the bubbles can be obtained after accurate calculation. The device and method have the advantages of simple structure, convenience for operation, easy control, high measurement precision, good reliability, capability of realizing accurate measurement and accurate prediction of the single bubbles in a stable gas-solid multi-phase flow, and wide application range.
Description
Technical field
The present invention relates to measurement mechanism and the method for a kind of bubble size and movement velocity, measurement mechanism and the method for bubble size and movement velocity in especially a kind of dense gas solid bed.
Background technology
The coal resources of China mainly are distributed in the drought and water shortage areas such as Shanxi, Shaanxi, Inner Mongol, Xinjiang, adopt the technical difficulty of wet coal preparation very large, and therefore exploitation and popularization High Effective Dry Coal Beneficiation Technology are extremely urgent.Concentrated phase high density fluidisation bed accessory based on gas-solid multiphase flow has the advantages such as applied range, the efficiency of separation is high, environmental pollution is little, is applied to gradually the dry coal preparation field.This fluidized bed mainly is to form the stable loose formula bubbling fluidized bed of standard of each point even density in the bed by the abundant contact of gas-solid two-phase and stable-state flow, and separating by density stratification for coal particles provides good environment.The behavior such as bubble size and movement velocity is to judge that fluidized bed is in accurate particulate fluidization state and whether density keeps uniform and stable important evidence, thus on raw coal by the vital impact of density separation behavior generation.Study seldom for the measurement of bubble size and movement velocity in the airtight polyphasic flow of concentrated phase, particularly dense gas solid bed at present.
Summary of the invention
Technical matters: the objective of the invention is the concentrated phase gas-solid high density fluidisation bed that adopts for coal dry cleaning, provide a kind of simple in structure, easy to operate, easy to control, measuring accuracy is high, measurement mechanism and the method for bubble size and movement velocity in the dense gas solid bed of good reliability, applied range.
Technical scheme: the measurement mechanism of bubble size and movement velocity in the dense gas solid bed of the present invention, in gas-solid fluidized bed bottom cloth general mood chamber and airflow-distribution board are set, gas-solid fluidized bed bottom and spinner-type flowmeter, air pressure control device, bellows chamber and blower fan are linked in sequence, be connected with the dynamic differential pressure measurement mechanism in gas-solid fluidized bed side, the fluctuation situation of Real-Time Monitoring bed pressure drop; Gas-solid fluidized bed inner set magnet breeze is main separating medium, and the fluidized bed front position is installed the high speed dynamic camera, and the camera lens of video camera can be regulated the bubble motion state that coverage is obtained differing heights bed plane automatically; High speed dynamic camera and data-signal display, data acquisition output and memory storage are linked in sequence, but bubble motion information Real-time Collection is delivered to follow-up data storage and analytic system; Adopt Data Management Analysis software that the data that gather storage are carried out performance analysis and calculate, can obtain bubble size and the movement velocity at any bed height place in the fluidized bed.
The coverage of described high speed dynamic camera covers whole fluidized bed model area.
The measuring method of bubble size and movement velocity, the measuring method of bubble size and movement velocity, at first regulate the quiescent bed layer height in gas-solid fluidized bed, the height of quiescent bed layer height is 3/5 of integral bed layer height, choosing successively granularity is respectively-0.3+0.15mm, in the high-density magnet breeze of-0.15+0.074mm and-0.074+0.045mm any add gas-solid fluidized bed in, open blower fan, the pressurized air that passes into is behind the airflow-distribution board even distributing wind, enter fluidized bed body, make gas-solid fluidized bed interior high-density magnet breeze produce fluidisation, after the complete fluidisation of high-density magnet breeze, open the dynamic differential pressure measurement mechanism, detect the fluctuation situation of bed pressure drop, the fluctuation situation of described dynamic differential pressure measurement mechanism Real-Time Monitoring bed pressure drop, in order to come control operation gas speed by regulating spinner-type flowmeter at any time, guarantee the reliable and stable of bubble size and movement velocity measurement result, by regulating spinner-type flowmeter control gas speed fluctuation range, through 30 seconds, after high-density magnet breeze fluidisation is stable, produce uniform and stable bubble flow in the fluidized bed, and take micro-bubble and minute bubbles as main; To fluidized bed, bed height is the position of 5cm, and the bubble motion state that passes whole bed cross section is taken seizure with the camera adjusting of high speed dynamic camera; Take continuously and obtain bubble at the movable information of 10s in the time period, instant playback and is delivered to data acquisition output and memory storage on the data-signal display; Adjust the camera site of high speed dynamic camera, be that bubble motion state in 5-28cm interval is taken seizure to fluidized bed model bed height, and effective bubble motion information all is passed to data acquisition output and memory storage; After whole collections are finished to the bubble motion information of different height of bed position, adopt the Matlab data analysis software that the bubble motion information in data collection output and the memory storage is carried out comprehensive computational analysis, can obtain bubble size and the movement velocity at any bed height place in the fluidized bed.
Described high speed dynamic camera and data-signal display, data acquisition output and memory storage are united use, and Real Time Observation detects the motion change situation of bubble in gas-solid fluidized bed.
Beneficial effect, owing to adopted such scheme, behavior catches shooting to bubble motion to adopt the high speed dynamic camera, and resolution is high, and it is large to take frame number, has effectively avoided because the picture catching error that the bubble size change frequency is high, movement velocity causes soon; The high speed dynamic camera is connected with data-signal display, data acquisition output and memory device, immediately the bubble motion information that shooting is captured shows and gathers feedback, effectively avoided having improved measuring accuracy because the bubble motion information that signal delay produces receives error; The bubble motion information instant playback that seizure photographs is to the data-signal display, can observe at any time shape, size and the motion state of bubble flow, and according to bubble motion behavior adjusting operation parameter, make fluidized bed keep continuing to produce the accurate particulate fluidization state of microvesicle and vesicle; Bubble information in data acquisition output and the memory storage can adopt Data Management Analysis software to carry out accurate Calculation and process, and obtains the valid data of bubble size and movement velocity.Measurement mechanism and the method for bubble size and movement velocity in the application dense gas solid bed, efficiently solve the change in size of random motion bubble in the fluidized bed and the bottleneck that movement velocity can't directly be measured, improved simultaneously measuring accuracy, measuring error is very little, have simple in structure, control is convenient, the characteristics of good reliability, can be widely used in the Measurement accuracy of bubble flow law of dimension and movement velocity in other dense gas-solid multiphase flow.
Advantage: this measurement mechanism and method are simple in structure, easy to operate, easy to control, measuring accuracy is high, good reliability, the Measurement accuracy of bubble size and movement velocity in the dense gas-solid multiphase flow of energy realization, applied range, be applicable to the measurement of bubble motion behavior in the dense gas solid bed, also be applicable to the measurement of bubble motion behavior in other dense gas-solid multiphase flow, the Accurate Prediction of gas-solid fluidized bed separating density is calculated with choosing of sorting operating parameter have important value and significance.
Description of drawings
Fig. 1 is the work structuring figure of bubble size and movement velocity measurement mechanism in the dense gas solid bed of the present invention.
Among the figure: 1, blower fan; 2, bellows chamber; 3, air pressure control device; 4, spinner-type flowmeter; 5, cloth general mood chamber; 6, airflow-distribution board; 7, gas-solid fluidized bed; 8, dynamic differential pressure measurement mechanism; 9, high speed dynamic camera; 10, data-signal display; 11, data acquisition output and memory storage.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are further described:
Embodiment 1: bubble size and movement velocity measurement mechanism have measurement mechanism and measuring method in the dense gas solid bed of the present invention.
Bubble size and movement velocity measurement mechanism, cloth general mood chamber 5 and airflow-distribution board 6 are set in gas-solid fluidized bed 7 bottom, gas-solid fluidized bed bottom and spinner-type flowmeter 4, air pressure control device 3, bellows chamber 2 and blower fan 1 are linked in sequence, and are connected with dynamic differential pressure measurement mechanism 8 in gas-solid fluidized bed side; In gas-solid fluidized bed positive front portion high speed dynamic camera 9 is set, adjusts to best shooting angle and position; High speed dynamic camera 9 is linked in sequence with data-signal display 10, data acquisition output and memory storage 11, and taking the bubble motion information that captures can be delivered on the data-signal display 10 in real time.
Described high speed dynamic camera 9 is united use with data-signal display 10, data acquisition output and memory storage 11, and Real Time Observation detects the motion change situation of bubble in gas-solid fluidized bed 7.
Bubble size and movement velocity measuring method, at first regulate the quiescent bed layer height in gas-solid fluidized bed 7, the height of quiescent bed layer height is 3/5 of integral bed layer height, the quiescent bed layer height is that the high-density magnet breeze is added the apparent height that fluidized bed presents later on, choosing successively granularity is respectively-0.3+0.15mm, in the high-density magnet breeze of-0.15+0.074mm and-0.074+0.045mm any adds in gas-solid fluidized bed 7, open blower fan, the pressurized air that passes into is behind airflow-distribution board 6 even distributing winds, enter fluidized bed body, make the high-density magnet breeze in gas-solid fluidized bed 7 produce fluidisation, after the complete fluidisation of high-density magnet breeze, open dynamic differential pressure measurement mechanism 8, detect the fluctuation situation of bed pressure drop, the fluctuation situation of described dynamic differential pressure measurement mechanism 8 Real-Time Monitoring bed pressure drops, in order to come control operation gas speed by regulating spinner-type flowmeter 4 at any time, assurance bubble motion information measurement result's is reliable and stable, by regulating spinner-type flowmeter control gas speed fluctuation range, through 30 seconds, after high-density magnet breeze fluidisation is stable, produce uniform and stable bubble flow in the fluidized bed, and take micro-bubble and vesicle as main; To fluidized bed, bed height is the position of 5cm, and the bubble motion state that passes whole bed cross section is taken seizure with the camera adjusting of high speed dynamic camera 9; Take continuously and obtain bubble at the movable information of 10s in the time period, instant playback and is delivered to data acquisition output unit 11 on data-signal display 10; Adjust the camera site of high speed dynamic camera, be that bubble motion state in 5-28cm interval is taken seizure to fluidized bed model bed height, and effective bubble motion information all is passed to data acquisition output unit 11; After whole collections are finished to the bubble motion state of different height of bed position, adopt data analysis software that the bubble information in data collection output and the memory storage 11 is carried out comprehensive computational analysis, can obtain bubble size and the movement velocity at any bed height place in gas-solid fluidized bed 7.
Described data-signal display 10 is united use with data acquisition output and memory storage 11, detects in real time the motion change situation of bubble in gas-solid fluidized bed 7.
Bubble size and movement velocity measurement mechanism in the dense gas solid bed of the present invention mainly are made of gas-solid fluidized bed 7, cloth general mood chamber 5, airflow-distribution board 6, high speed dynamic camera 9, data-signal display 10, data acquisition output and memory storage 11.Gas-solid fluidized bed 7 pass through cloth general mood chamber 5 is connected with air feed system, regulates the air-flow flux by spinner-type flowmeter 4; High speed dynamic camera 9 and data-signal display 10 close-coupled guarantee the real-time that shows; Data-signal display 10 and data acquisition output and memory storage 11 close-coupled have also guaranteed the real-time reliable delivery storage of bubble motion information; Dynamic differential pressure measurement mechanism 8 is installed in gas-solid fluidized bed 7 sidewall, detects in real time the fluctuation of pressure drop situation of fluidized bed, and modification stability gas speed is had vital role.
The measuring method of bubble size and movement velocity in the dense gas solid bed of the present invention:
Employing-0.3+0.15mm respectively, the high-density magnet breeze of-0.15+0.074mm and-0.074+0.045mm is as the medium solid of fluidized bed.At first the coarse fraction high-density magnet breeze of general-0.3+0.15mm joins in gas-solid fluidized bed 7, regulating the quiet height of bed is 3/5 of integral bed layer height, open blower fan 1, pass into pressurized air by the cloth general mood chamber 5 of air feed system to gas-solid fluidized bed 7, pressurized air makes the high-density magnet breeze in gas-solid fluidized bed 7 produce fluidisation under the even distributing wind effect of airflow-distribution board 6; Open dynamic differential pressure measurement mechanism 8, detect the fluctuation situation of bed pressure drop; After fluidized state is stable, adjust high speed dynamic camera 9 and be in best shooting angle and position, open video camera, video camera will be taken the bubble motion information that catches a certain bed height immediately; Through after a while, after the bubble motion situation that captures keeps relative stability, turn-on data Signal Monitor 10 and data acquisition output and memory storage 11, the output situation of observing the bubble motion behavior, and the real time data value of record bubble motion information; Come the scope of control operation gas speed by regulating spinner-type flowmeter 4, under different operating gas speed, obtain the motor behavior situation of bubble flow in gas-solid fluidized bed 7; Take same operating process respectively in the fluidized bed of fine fraction high-density magnet breeze as medium solid of p-0.15+0.074mm and-0.074+0.045mm, bubble size and the movement velocity of bubble flow in gas-solid fluidized bed 7 measured.
Claims (5)
1. the measurement mechanism of bubble size and movement velocity in the dense gas solid bed, it is characterized in that: the measurement mechanism of bubble size and movement velocity, in gas-solid fluidized bed bottom cloth general mood chamber and airflow-distribution board are set, gas-solid fluidized bed bottom and spinner-type flowmeter, air pressure control device, bellows chamber and blower fan are linked in sequence, and are connected with the dynamic differential pressure measurement mechanism in gas-solid fluidized bed side; Gas-solid fluidized bed inner set magnet breeze is main separating medium, and the fluidized bed front position is installed the high speed dynamic camera, and the camera lens of video camera can be regulated the bubble motion state that coverage is obtained differing heights bed plane automatically; High speed dynamic camera and data-signal display, data acquisition output and memory storage are linked in sequence, but the output of bubble motion information Real-time Collection also can realize in time comprehensively storage of data; Adopt Matlab Data Management Analysis software that the data that gather storage are carried out performance analysis and calculate, can obtain bubble size and the movement velocity at any bed height place in the fluidized bed.
2. the measurement mechanism of bubble size and movement velocity in the dense gas solid bed according to claim 1, it is characterized in that: described bubble motion status information is after the high speed dynamic camera catches shooting, but instant playback is on the data-signal display, and be delivered in real time on data acquisition output and the memory storage, realize in time comprehensively storage of dynamic data.
3. the measurement mechanism of bubble size and movement velocity in the dense gas solid bed according to claim 1, it is characterized in that: the coverage of described high speed dynamic camera covers whole fluidized bed model area.
4. the measuring method of bubble size and movement velocity in the dense gas solid bed, it is characterized in that: the measuring method of bubble size and movement velocity, at first regulate the quiescent bed layer height in gas-solid fluidized bed, the height of quiescent bed layer height is 3/5 of integral bed layer height, choosing successively granularity is respectively-0.3+0.15mm, in the high-density magnet breeze of-0.15+0.074mm and-0.074+0.045mm any add gas-solid fluidized bed in, open blower fan, the pressurized air that passes into is behind the airflow-distribution board even distributing wind, enter fluidized bed body, make gas-solid fluidized bed interior high-density magnet breeze produce fluidisation, after the complete fluidisation of high-density magnet breeze, open the dynamic differential pressure measurement mechanism, detect the fluctuation situation of bed pressure drop, the fluctuation situation of described dynamic differential pressure measurement mechanism Real-Time Monitoring bed pressure drop, in order to come control operation gas speed by regulating spinner-type flowmeter at any time, guarantee the reliable and stable of bubble size and movement velocity measurement result, by regulating spinner-type flowmeter control gas speed fluctuation range, through 30 seconds, after high-density magnet breeze fluidisation is stable, produce uniform and stable bubble flow in the fluidized bed, and take micro-bubble and minute bubbles as main; To fluidized bed, bed height is the position of 5cm, and the bubble motion state that passes whole bed cross section is taken seizure with the camera adjusting of high speed dynamic camera; Take continuously and obtain bubble at the movable information of 10s in the time period, instant playback and is delivered to data acquisition output and memory storage on the data-signal display; Adjust the camera site of high speed dynamic camera, be that bubble motion state in 5-28cm interval is taken seizure to fluidized bed model bed height, and effective bubble motion information all is passed to data acquisition output and memory storage; After whole collections are finished to the bubble motion information of different height of bed position, adopt the Matlab data analysis software that the bubble motion information in data collection output and the memory storage is carried out comprehensive computational analysis, can obtain bubble size and the movement velocity at any bed height place in the fluidized bed.
5. the measuring method of bubble size and movement velocity in the dense gas solid bed according to claim 4, it is characterized in that: described high speed dynamic camera and data-signal display, data acquisition output and memory storage are united use, and Real Time Observation detects the motion change situation of bubble in gas-solid fluidized bed.
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| CN103743538A (en) * | 2014-01-09 | 2014-04-23 | 煤炭科学研究总院 | Air distributor test device for fluidized bed |
| CN104089754A (en) * | 2014-07-22 | 2014-10-08 | 常州大学 | Method and device for capturing bubble polymerization process |
| CN104569487A (en) * | 2013-10-23 | 2015-04-29 | 江苏省沙钢钢铁研究院有限公司 | Device for measuring minimum fluidizing velocity of furnace burdens of blast furnace and application method for device |
| CN105214956A (en) * | 2015-10-28 | 2016-01-06 | 中国矿业大学 | A kind of dense gas solid bed dry separation system and technique |
| CN106197302A (en) * | 2016-07-19 | 2016-12-07 | 水利部交通运输部国家能源局南京水利科学研究院 | The measurement apparatus of a kind of Venturi tube aeration bubbles micron order diameter and measuring method |
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| CN113654755B (en) * | 2021-08-09 | 2022-04-19 | 中国矿业大学 | Gas-solid separation fluidized bed space characteristic research device and characteristic research method |
| CN114950284A (en) * | 2022-05-19 | 2022-08-30 | 台州学院 | Gas jet flow optimization method for gas-liquid bubbling fluidized bed |
| CN114950284B (en) * | 2022-05-19 | 2023-01-10 | 台州学院 | Gas jet flow optimization method for gas-liquid bubbling fluidized bed |
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Application publication date: 20130417 |