CN107121264A - Experimental system and experimental method that a kind of controllable micron particles of humiture are collided with different surfaces - Google Patents
Experimental system and experimental method that a kind of controllable micron particles of humiture are collided with different surfaces Download PDFInfo
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Abstract
Experimental system and experimental method that a kind of controllable micron particles of humiture are collided with different surfaces, belong to Dual-Phrase Distribution of Gas olid experimental provision.The experimental system mainly includes micron particles feed unit and the crash unit being arranged in Laboratory Module, and micron particles feed unit provides carrier gas and the particle mixed of certain speed for crash unit.Crash unit includes impact platform and particulate supply pipe, and thermocouple is provided with the outer wall of particulate supply pipe gas outlet and impact platform.Light source, quartz glass window, crash unit and high-speed camera are installed point-blank, high-speed camera mechatronics computer.The experimental provision can obtain incidence rate, ball rebound velocity and the critical collection speed when micron particles hit with different surfaces；Study under different humitures, different materials and particles environment, energy dissipation mechanism when microparticle hits with different surfaces；It is that Dual-Phrase Distribution of Gas olid and the particles collision being related in industrial circle, particle deposition provide experimental verification.
Description
Technical field
The experimental system collided the present invention relates to a kind of controllable micron particles of humiture and different surfaces and experiment side
Method, belongs to Dual-Phrase Distribution of Gas olid experimental provision technical field.
Background technology
Fine particle depositional phenomenon is present in the various fields such as the energy, environmental project, chemical industry, microelectronics and mechanical engineering.
On the one hand, typically there is fine grained deposition heat exchanger tube superficial dust in negative effect, such as boiler to cause heat transfer deterioration, translucent element
Upper dust stratification can cause luminous flux to decline（Such as solar-energy photo-voltaic cell, due to superficial dust, power output is reduced）, fine grained is micro-
Deposition in Mechatronic Systems may cause mechanical breakdown or cause flow blockage, air fine grained in human respiratory tract/alveolar
Site deposition causes disease etc..On the other hand, fine grained deposition can be strengthened in practice, using field of energy source power as
Example, passes through additional sound field, magnetic field, electric field, chemical agglomeration process（Also known as accumulation process）Fine particle groups are polymerized to larger particles, from
And effectively deposit and remove in conventional cloth bag or electrostatic precipitator.
It is above-mentioned it is main from macroscopic view application angle be related to multiphase flow in fine grain deposition problems, to disclose these processes behind
Physical essence, from the force-displacement relationship formula for characterizing micro-scale particles' interaction, studies fine grained interphase interaction
Mechanism.The experiment relative difficult that two close particle diameter fine graineds contact with each other, therefore controllable micro- of contrived experiment temperature and humidity
The experimental provision that metrical scale particle is collided with different surfaces is to set up the necessary experimental basis of wet granular kinetic theory.
The content of the invention
In order to overcome problems of the prior art, the present invention provide a kind of controllable micron particles of humiture with not
It is micro- from characterizing to disclose the physical essence of fine grain deposition in multiphase flow with the experimental system and experimental method of surface collision
The force-displacement relationship formula of particles' interaction is set out, and studies fine grained interphase interaction mechanism.
The technical solution adopted by the present invention is：The experiment that a kind of controllable micron particles of humiture are collided with different surfaces
System, it includes Laboratory Module, light source, high-speed camera and computer, the Laboratory Module comprising upper lid, experiment nacelle and under
Lid, provided with two relative quartz glass windows in experiment nacelle；It also includes a micron particles feed unit and one
The individual crash unit being arranged in Laboratory Module, the micron particles feed unit includes carrier gas bottle, two mass flowmenters, one
Individual wet granular generator and a blender, carrier gas bottle occur through a mass flowmenter, wet granular all the way by two-way pipeline
Device connects blender, and another road connects blender through another mass flowmenter, the carrier gas flowed out from blender and micron order
Grain gaseous mixture connects crash unit through being wound with the snake pipe of heat transmission belt；The crash unit is supplied comprising impact platform and particulate
Pipe, the particulate supply pipe being fixed on lid is connected with being wound with the snake pipe of heat transmission belt, in the outer of particulate supply pipe gas outlet
First thermocouple of the wall provided with connection temperature controller, impact platform connects the cylindrical structure of electrical bar using lower end,
The outer wall of impact platform is provided with the second thermocouple for connecting another temperature controller, and the electrical bar of connection pressure regulator, which is located at, to be fixed
In earthenware in connector, it is connected by screw bolts between connector and lower cover；The light source, quartz glass window, shock
Unit and high-speed camera are installed point-blank, high-speed camera mechatronics computer.
The lower wall of the experiment nacelle is provided with perforate.
First thermocouple is arranged at the 0.5-1.5mm of particulate supply pipe gas outlet outer wall, temperature controller control
The air outlet temperature of particulate supply pipe is 220-240 DEG C.
Second thermocouple is arranged on the outer wall of impact platform at 0.5-1.5mm, and the pressure regulator controls electrical bar
Heating power, by temperature controller control impact platform temperature be 190-210 DEG C.
The cylinder diameter of the impact platform is 1.8-2.2mm.
The experimental method that a kind of controllable micron particles of described humiture are collided with different surfaces uses following steps：
（1）Micro dry coal ash particle is put into wet granular generator；
（2）High-speed camera is connected with computer, change Computer IP address；
（3）Control software is carried with the high-speed camera installed on computers, and camera parameters, such as resolution ratio, sample rate are set
And the time for exposure, video camera triggering mode is delay triggering；
（4）The focal length of high-speed camera is adjusted, makes imaging clearly in shooting area, prepares to shoot；
（5）Check that the first thermocouple, the second thermocouple have reached set temperature value；
（6）Open after air valve, rapid adjustment air flow rate, after after steady air current, click on shooting push button, shot；
（7）The realtime graphic shown on observation computer, after after appropriate time, click stops clapping button, terminates record；
（8）Playback button is clicked on, the picture recorded is observed, if picture shows that particle is unintelligible or does not capture particle,
Re-shoot, until capturing the particles hit planar surface process of imaging clearly；
（9）The video of shooting is preserved into computer, for successive image processing.
The beneficial effects of the invention are as follows：The experimental system that the controllable micron particles of this humiture are collided with different surfaces
The main crash unit for including micron particles feed unit and being arranged in Laboratory Module, micron particles feed unit includes load
Gas cylinder, two mass flowmenters, a wet granular generator and a blender, the carrier gas of certain speed is provided for crash unit
And particle mixed.Crash unit includes impact platform and particulate supply pipe, is provided with the outer wall of particulate supply pipe gas outlet
First thermocouple；The outer wall of impact platform is provided with the second thermocouple of connection.Light source, quartz glass window, crash unit and height
Fast video camera is installed point-blank, high-speed camera mechatronics computer.The main contents that the experimental provision can be studied
For：Incidence rate, ball rebound velocity and the critical collection speed when micron particles hit with different surfaces can be obtained；Research is different
Under humidity, different temperatures, variable grain material and different-grain diameter particle environment, energy when micron particles hit with different surfaces
Dissipation mechanism；Result of study can be Dual-Phrase Distribution of Gas olid and be related in industrial circle（Such as：Dedusting, dust stratification, filtering）Particles collision,
Infrastest checking is provided in terms of particle deposition.
Brief description of the drawings
Fig. 1 is the experimental system figure that a kind of controllable micron particles of humiture are collided with different surfaces.
Fig. 2 is the structure chart of Laboratory Module.
In figure：1st, carrier gas bottle, 2, mass flowmenter, 3, wet granular generator, 4, blender, 5, heat transmission belt, 6, temperature control
Device processed, the 7, first thermocouple, 7a, the second thermocouple, 8, light source, 9, electrical bar, 10, pressure regulator, 11, high-speed camera, 12, meter
Calculation machine, 13, upper lid, 14, experiment nacelle, 14a, perforate, 15, quartz glass, 16, end cap, 17, lower cover, 18, connector, 19, pottery
Porcelain tube, 20, impact platform, 21, particulate supply pipe.
Embodiment
Present disclosure is further described referring to the drawings.
Fig. 1,2 show a kind of controllable micron particles of humiture and different surfaces collision experimental system figure and experiment
The structure chart in cabin.
In figure, the controllable micron particles of this humiture include an experiment with the experimental system that different surfaces are collided
What cabin, light source 8, high-speed camera 11, computer 12, a micron particles feed unit and one were arranged in Laboratory Module hits
Hit unit.Laboratory Module includes upper lid 13, experiment nacelle 14 and lower cover 17, provided with two relative quartzy glass in experiment nacelle 14
Glass form and perforate 14a.
Micron particles feed unit includes carrier gas bottle 1, two mass flowmenters 2, a wet granular generator 3 and one
Blender 4, carrier gas bottle 1 connects blender 4, separately through a mass flowmenter 2, wet granular generator 3 all the way by two-way pipeline
Connect blender 4 through another mass flowmenter 2 all the way, carrier gas and the micron particles gaseous mixture flowed out from blender 4 pass through around
There is the snake pipe connection crash unit of heat transmission belt 5.
Crash unit includes impact platform 20 and particulate supply pipe 21, be fixed on particulate supply pipe 21 on lid 13 with around
The snake pipe for having heat transmission belt 5 is connected, and first provided with connection temperature controller 6 on the outer wall of the gas outlet of particulate supply pipe 21
Thermocouple 7, the first thermocouple 7 is arranged at the 1.0mm of the gas outlet outer wall of particulate supply pipe 21, the control particulate of temperature controller 6
The air outlet temperature of supply pipe 21 is 230 DEG C.
Impact platform 20 connects a diameter of 2.0mm of electrical bar 9 cylindrical structure using lower end, in impact platform 20
Outer wall is arranged on the outer of impact platform 20 provided with the second the thermocouple 7a, the second thermocouple 7a for connecting another temperature controller 6
On wall at 1.0mm, the pressure regulator 10 controls the heating power of electrical bar 9, and the temperature of impact platform 20 is controlled by temperature controller 6
Spend for 200 DEG C.
The electrical bar 9 of connection pressure regulator 10, which is located at, to be fixed in the earthenware 19 in connector 18, connector 18 and lower cover
It is connected by screw bolts between 17.Light source 8, quartz glass window, crash unit and high-speed camera 11 are installed point-blank,
High-speed camera 11 electrically connects computer 12.
The experimental method that the controllable micron particles of this humiture are collided with different surfaces uses following steps：
（1）Micro dry coal ash particle is put into wet granular generator；
（2）High-speed camera 11 is connected with computer 12, change Computer IP address；
（3）Camera parameters are set with installing high-speed camera 11 on the computer 12 and carrying control software, such as resolution ratio, are adopted
Sample rate and time for exposure, video camera triggering mode trigger for delay；
（4）The focal length of high-speed camera 11 is adjusted, makes imaging clearly in shooting area, prepares to shoot；
（5）Check that the first thermocouple 7, the second thermocouple 7a have reached set temperature value；
（6）Open after air valve, rapid adjustment air flow rate, after after steady air current, click on shooting push button, shot；
（7）The realtime graphic shown on observation computer 12, after after appropriate time, click stops clapping button, terminates record；
（8）Playback button is clicked on, the picture recorded is observed, if picture shows that particle is unintelligible or does not capture particle,
Re-shoot, until capturing the particles hit planar surface process of imaging clearly；
（9）The video of shooting is preserved into computer 12, for successive image processing.
Using above-mentioned technical scheme, experimental system is by micron particles feed unit and the shock being arranged in Laboratory Module
Unit is constituted.The carrier gas of micron particles can be the gaseous mixture of nitrogen, carbon dioxide, air or more than one gases, carrier gas
It is divided into two-way, accurately controls its flow by mass flowmenter respectively.It is dry gas all the way, another road is installed by BGI companies of the U.S.
The wet granular generator 3 of development, produces humid gas；Two-way gas enters an installation hygronom（Range is 0-100%）Mixing
Container, the flow of two-way gas can be efficiently controlled by mass flowmenter, so as to realize that the humidity of gas in stainless steel is obtained
To effective control, crash unit gas vent flow velocity reaches as high as 20m/s.In addition, using companion to gaseous mixture back segment air flow system
The torrid zone can be heated, and the temperature that High Accuracy Thermocouple Temperature measures air-flow is installed near crash unit gas vent, passes through temperature
Controller, pressure regulator adjust the power of heat transmission belt, and air-flow maximum heating temperature efficiently controls gas up to 230 DEG C so as to realize
The temperature of stream.
The core of crash unit is impact platform, to consider that platform surface characteristic and platform material can all be touched to particle
Collide reason produce influence, by impact platform be designed to detachably, replacing, a diameter of 2mm cylinder, using heating rod to cylinder
Body is heated, so as to transfer heat to a diameter of 2mm impact platform.Thermoelectricity is installed at impingement distance platform surface 1mm
Its temperature occasionally is detected, the power of electrically heated rod is adjusted by temperature controller, pressure regulator, impact platform maximum temperature is up to 200
DEG C, efficiently control impact platform temperature so as to realize.
High speed video system by high-speed camera, spot light, microlens are focused and computer is constituted, by video camera and meter
Calculation machine is connected, to store shooting video.High speed video system can be clearly captured mistake of the particle diameter for more than 2 μm particles hit flat boards
Journey.
The temperature and humidity of experimental system is stored and shown in real time on computers by several device for picking, and air velocity can be achieved
Control is in 0.5m/s-20m/s, and airflow temperature-control is at 230 DEG C, and impact platform temperature control is in 200 DEG C, replaceable unlike material
Platform, so as to realize under humiture controlled condition, micron particles work with the experimental study that different surfaces hit, and can have
Deposition process, heat exchanger tube when effect simulation flue endoparticle deposition process, electrostatic precipitator endoparticle arrival collecting plate
The actual industrial process such as superficial dust, while providing effective support for the theoretical research of particle and plate impact process.
Claims (6)
1. the experimental system that a kind of controllable micron particles of humiture are collided with different surfaces, it includes Laboratory Module, a light
Source（8）, high-speed camera（11）And computer（12）, the Laboratory Module includes upper lid (13), experiment nacelle (14) and lower cover
(17), provided with two relative quartz glass windows in experiment nacelle (14)；It is characterized in that：It also includes a micron order
Grain feed unit and a crash unit being arranged in Laboratory Module, the micron particles feed unit include carrier gas bottle（1）、
Two mass flowmenters（2）, a wet granular generator（3）With a blender（4）, carrier gas bottle（1）Pass through two-way pipeline, one
Lu Jingyi mass flowmenter（2）, wet granular generator（3）Connect blender（4）, another road is through another mass flowmenter
（2）Connect blender（4）, from blender（4）The carrier gas of outflow is with micron particles gaseous mixture through being wound with heat transmission belt（5）It is snakelike
Pipeline connects crash unit；The crash unit includes impact platform（20）With particulate supply pipe (21), lid (13) is fixed on
On particulate supply pipe (21) and be wound with heat transmission belt（5）Snake pipe connection, the outer wall in particulate supply pipe (21) gas outlet
Provided with connection temperature controller（6）The first thermocouple (7), impact platform（20）The circle of electrical bar (9) is connected using lower end
Column structure, in impact platform（20）Outer wall provided with connecting another temperature controller（6）The second thermocouple (7a), connection
Pressure regulator（10）Electrical bar (9) be located at be fixed on connector（18）In earthenware (19) in, connector（18）With lower cover
(17) it is connected by screw bolts between；The light source（8）, quartz glass window, crash unit and high-speed camera（11）It is arranged on
On straight line, high-speed camera（11）Electrically connect computer（12）.
2. the experimental system that a kind of controllable micron particles of humiture according to claim 1 are collided with different surfaces,
It is characterized in that：The lower wall of the experiment nacelle (14) is provided with perforate（14a）.
3. the experimental system that a kind of controllable micron particles of humiture according to claim 1 are collided with different surfaces,
It is characterized in that：First thermocouple (7) is arranged at the 0.5-1.5mm of particulate supply pipe (21) gas outlet outer wall, temperature control
Device processed（6）The air outlet temperature for controlling particulate supply pipe (21) is 220-240 DEG C.
4. the experimental system that a kind of controllable micron particles of humiture according to claim 1 are collided with different surfaces,
It is characterized in that：Second thermocouple（7a）It is arranged on impact platform（20）Outer wall at 0.5-1.5mm, the pressure regulator
（10）The heating power of electrical bar (9) is controlled, by temperature controller（6）Control impact platform（20）Temperature be 190-210 DEG C.
5. the experimental system that a kind of controllable micron particles of humiture according to claim 1 are collided with different surfaces,
It is characterized in that：The impact platform（20）Cylinder diameter be 1.8-2.2mm.
6. the experimental method that a kind of controllable micron particles of humiture according to claim 1 are collided with different surfaces,
It is characterized in that：Using following steps：
（1）Micro dry coal ash particle is put into wet granular generator；
（2）By high-speed camera（11）With computer（12）Connection, change Computer IP address；
（3）With installed in computer（12）On high-speed camera（11）Carry control software and camera parameters are set, such as differentiate
Rate, sample rate and time for exposure, video camera triggering mode trigger for delay；
（4）Adjust high-speed camera（11）Focal length, make imaging clearly in shooting area, prepare to shoot；
（5）Check the first thermocouple (7), the second thermocouple（7a）Set temperature value is reached；
（6）Open after air valve, rapid adjustment air flow rate, after after steady air current, click on shooting push button, shot；
（7）Observe computer（12）The realtime graphic of upper display, after after appropriate time, click stops clapping button, terminates record；
（8）Playback button is clicked on, the picture recorded is observed, if picture shows that particle is unintelligible or does not capture particle,
Re-shoot, until capturing the particles hit planar surface process of imaging clearly；
（9）The video of shooting is preserved to computer（12）In, for successive image processing.
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