CN111337394A - Experimental device for controllable micron order granule torrent of humiture is reunited - Google Patents
Experimental device for controllable micron order granule torrent of humiture is reunited Download PDFInfo
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- 239000008187 granular material Substances 0.000 title claims description 3
- 239000007789 gas Substances 0.000 claims abstract description 67
- 239000002245 particle Substances 0.000 claims abstract description 60
- 230000002776 aggregation Effects 0.000 claims abstract description 44
- 238000005054 agglomeration Methods 0.000 claims abstract description 37
- 238000010438 heat treatment Methods 0.000 claims abstract description 23
- 239000000428 dust Substances 0.000 claims abstract description 20
- 239000003570 air Substances 0.000 claims description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 4
- 239000001569 carbon dioxide Substances 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 4
- 238000012546 transfer Methods 0.000 claims description 4
- 238000005137 deposition process Methods 0.000 abstract description 4
- 238000011160 research Methods 0.000 abstract description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 2
- 238000009825 accumulation Methods 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 239000003546 flue gas Substances 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000010419 fine particle Substances 0.000 description 13
- 230000008021 deposition Effects 0.000 description 9
- 238000004220 aggregation Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 239000010883 coal ash Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000002956 ash Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
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- 230000009471 action Effects 0.000 description 1
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- 238000007599 discharging Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000012717 electrostatic precipitator Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000011089 mechanical engineering Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000004377 microelectronic Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 210000003456 pulmonary alveoli Anatomy 0.000 description 1
- 210000002345 respiratory system Anatomy 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/04—Investigating sedimentation of particle suspensions
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N2015/0092—Monitoring flocculation or agglomeration
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Abstract
An experimental device for turbulent agglomeration of micron-sized particles with controllable temperature and humidity belongs to the field of experimental devices for collision agglomeration of turbulent flow fields with controllable temperature and humidity. The experimental device for the turbulent agglomeration of micron-sized particles with controllable temperature and humidity comprises a gas particle generating device, a gas particle mixing and heating device, a turbulent flow collision agglomeration device, a high-speed camera device and a gas particle emission and treatment device, and can realize the control of the air flow speed at 0.5-20m/s and the air flow temperature at 220-230 ℃, so that the experimental research work of the collision agglomeration among the micron-sized particles under the environmental condition and the temperature and humidity controllable condition can be realized, the actual industrial processes such as the particle deposition process in a flue gas pipeline, the deposition process when the particles in an electrostatic dust collector reach a dust collecting plate, the dust accumulation on the surface of a heat exchange tube and the like can be effectively simulated, and meanwhile, an effective support is provided for the theoretical research of the collision.
Description
Technical Field
The invention relates to an experimental device for turbulent agglomeration of micron-sized particles with controllable temperature and humidity, belonging to the field of experimental devices for collision agglomeration of turbulent fields with controllable temperature and humidity.
Background
The deposition phenomenon of fine particles exists in many fields such as energy, environmental engineering, chemical engineering, microelectronics, mechanical engineering and the like. On the one hand, the deposition of fine particles generally has negative effects, such as deterioration of heat transfer due to deposition of ash on the surface of heat exchange tubes in a boiler, decrease of luminous flux due to deposition of ash on a light transmitting element (e.g., decrease of output power of a solar photovoltaic cell due to surface deposition), mechanical failure or flow blockage caused by deposition of fine particles in a micro electro mechanical system, diseases caused by deposition of fine particles in the atmosphere in respiratory tract/pulmonary alveoli of a human body, and the like. On the other hand, the deposition of fine particles can be enhanced in practice, and the fine particles are agglomerated into larger particles through an external sound field, a magnetic field, an electric field and a chemical agglomeration process (also called an agglomeration process) by taking the field of energy power as an example, so that the fine particles are effectively deposited and removed in a traditional cloth bag or an electrostatic dust collector.
The above-mentioned problem related to the deposition of fine particles in multiphase flow mainly from the macroscopic application perspective, in order to reveal the physical nature behind these processes, the interaction mechanism between fine particles was studied from the force-displacement relation that characterizes the interaction between micro-scale particles. Experiments that two fine particles with similar particle sizes are contacted with each other are relatively difficult, so that the design of an experimental device for collision agglomeration between micron-scale particles with controllable experimental temperature and humidity is the necessary experimental basis for establishing wet particle dynamics theory.
Disclosure of Invention
The invention aims to provide an experimental device for turbulent agglomeration of micron-sized particles with controllable temperature and humidity aiming at the defects in the prior art.
The technical scheme adopted by the invention is as follows: an experimental device for turbulence agglomeration of micron-sized particles with controllable temperature and humidity comprises a gas particle generating device, a gas particle mixing and heating device, a high-speed camera device, a gas particle emission processing device and a turbulence collision agglomeration device, wherein the gas particle generating device comprises a gas cylinder, a mass flow meter, a humidifier and a particle generator, one end of a sprayer of the humidifier extends into a gas mixer, the gas cylinder is connected with a second three-way valve through a first branch pipe and a flow meter by virtue of a first three-way valve, the gas cylinder is connected with the sprayer through the second branch pipe and another flow meter by virtue of the first three-way valve, a hygrometer is arranged on the gas mixer, and the gas mixer is connected with a mixing container through a second three-way valve by virtue;
the gas-particle mixing and heating device comprises a mixing container and a thermocouple, wherein a heating element is arranged on the outer wall of the mixing container, the thermocouple is inserted into the mixing container, and the inlet of the mixing container is connected with a gas mixer and a particle generator through a pipeline;
the turbulent flow collision aggregation device comprises a turbulent flow aggregation device, observation windows are arranged on two sides of the turbulent flow aggregation device, a turbulent flow column and a turbulent flow vortex sheet are arranged in the turbulent flow aggregation device, the turbulent flow column is cylindrical, the turbulent flow vortex sheet is of a cross-shaped columnar structure, the turbulent flow column and the turbulent flow vortex sheet are linearly arranged in a plane perpendicular to the flow direction of airflow, a first constant-speed sampler is arranged on an inlet pipeline of the turbulent flow aggregation device, a second constant-speed sampler is arranged on an outlet pipeline of the turbulent flow aggregation device, and the inlet pipeline of the turbulent flow aggregation device is connected with an outlet of a mixing container;
the high-speed camera device comprises a light source, a high-speed camera and a computer, wherein the light source and the high-speed camera are arranged on the outer side of an observation window of the turbulence agglomerator, the computer is connected with the high-speed camera, and the light source, the observation window and a camera of the high-speed camera are positioned on the same straight line;
the gas particle emission treatment device comprises an electrostatic dust collector and an induced draft fan, an inlet pipeline of the electrostatic dust collector is connected with an outlet of the turbulence agglomerator, an outlet pipeline of the electrostatic dust collector is connected with the induced draft fan, and a third constant-speed sampler is arranged on an outlet pipeline of the electrostatic dust collector.
The heating element adopts a heat transfer belt or a heating pipe.
The gas in the gas cylinder adopts at least one of nitrogen, carbon dioxide and air.
The invention has the beneficial effects that: the experimental device for the turbulent agglomeration of micron-sized particles with controllable temperature and humidity comprises a gas particle generating device, a gas particle mixing and heating device, a turbulent flow collision agglomeration device, a high-speed camera device and a gas particle emission and treatment device, and can realize the control of the air flow speed at 0.5-20m/s and the air flow temperature at 220-230 ℃, so that the experimental research work of the collision agglomeration among the micron-sized particles can be realized under the conditions of environment and controllable temperature and humidity, the actual industrial processes such as the particle deposition process in a flue gas pipeline, the deposition process when the particles in an electrostatic dust collector reach a dust collecting plate, the dust accumulation on the surface of a heat exchange tube and the like can be effectively simulated, and meanwhile, an effective support is provided for the theoretical research of the collision. The turbulent flow collision agglomeration device can generate turbulent flow fields in different forms by matching the turbulent flow columns with the turbulent flow vortex sheets. In addition, the high-speed camera system can clearly shoot the process of collision between particles with the particle size of more than 2 mu m and the agglomeration plate.
Drawings
FIG. 1 is a schematic diagram of an experimental apparatus for turbulent agglomeration of micron-sized particles with controllable temperature and humidity.
FIG. 2 is a schematic diagram of the structure of a turbulent agglomerator.
In the figure: 1. a gas cylinder, 1a, a first branch pipe, 1b, a second branch pipe, 2a, a first three-way valve, 2b, a second three-way valve, 3 mass flow meters, 4, a humidifier, 4a, a sprayer, 4b, a gas mixer, 5, a particle generator, 6, a heating element, 7, a mixing container, 8, a thermocouple, 9, a first constant-speed sampler, 9a, a second constant-speed sampler, 9b, a third constant-speed sampler, 10, a turbulence agglomerator, 10a, an observation window, 10b, a turbulence column, 10c, a turbulence vortex sheet, 11, a light source, 12, an electrostatic precipitator, 13, an induced draft fan, 14, a computer, 15, a high-speed camera.
Detailed Description
The apparatus of the present invention is further described below with reference to the accompanying drawings.
Fig. 1 shows a schematic diagram of an experimental apparatus for turbulent agglomeration of micron-sized particles with controllable temperature and humidity. In the figure, the experimental device for turbulent agglomeration of micron-sized particles with controllable temperature and humidity comprises a gas particle generating device, a gas particle mixing and heating device, a high-speed camera device, a gas particle discharging and processing device and a turbulent collision agglomeration device. Gas grain generating device contains gas cylinder 1, mass flow meter 3, humidifier 4 and particle generator 5, humidifier 4 contains atomizer 4a and blender 4b, gas cylinder 1 is through first three-way valve 2a through first branch pipe 1a, 3 connection gas mixer 4b of a flowmeter, gas cylinder 1 is through first three-way valve 2a through second branch pipe 1b, 3 connection atomizer 4a of another flowmeter, gas mixer 4b is stretched into to atomizer 4 a's one end, set up the hygrometer on the gas mixer 4b, gas mixer 4b passes through second three-way valve 2b and connects the gas discharge pipeline.
The gas-particle mixing and heating apparatus comprises a heating element 6, a mixing vessel 7 and a thermocouple 8, the heating element 6 is disposed on the outer wall of the mixing vessel 7, the thermocouple 8 is inserted into the mixing vessel 7, and the inlet of the mixing vessel 7 is connected to the gas discharge conduit of the gas mixer 4b and the particle discharge conduit of the particle generator 5.
The turbulent flow collision agglomeration device comprises a turbulent flow agglomeration device 10, wherein observation windows 10a are arranged on two sides of the turbulent flow agglomeration device 10, and a turbulent flow column 10b and a turbulent flow vortex sheet 10c are arranged inside the turbulent flow agglomeration device 10. The turbulence column 10b is cylindrical, the turbulence vortex sheet 10c is a cross-shaped columnar structure, the turbulence column 10b and the turbulence vortex sheet 10c are linearly arranged in a plane perpendicular to the flow direction of the airflow (as shown in fig. 2), the inlet pipeline of the turbulence agglomerator 10 is provided with a first constant velocity sampler 9, the outlet pipeline is provided with a second constant velocity sampler 9a, and the inlet pipeline of the turbulence agglomerator 10 is connected with the outlet of the mixing container 7.
The high-speed camera device comprises a light source 11, a high-speed camera 15 and a computer 14, wherein the light source 11 and the high-speed camera 15 are arranged on the outer side of an observation window 10a of the turbulence agglomerator 10, the computer 14 is connected with the high-speed camera 15, and cameras of the light source 11, the observation window 10a and the high-speed camera 15 are located on the same straight line.
The gas particle emission treatment device comprises an electrostatic dust collector 12 and an induced draft fan 13, wherein the inlet of the electrostatic dust collector 12 is connected with the outlet of the turbulent flow agglomerator 10, the outlet of the electrostatic dust collector 12 is connected with the induced draft fan 13, and the outlet pipeline of the electrostatic dust collector 12 is provided with a third constant velocity sampler 9 b.
The heating element 6 is a heat transfer belt or a heating tube. The gas in the gas cylinder 1 is at least one of nitrogen, carbon dioxide and air.
The working process of the device is as follows: the first three-way valve 2a and the second three-way valve 2b are opened, the flow rate of the air flow is rapidly adjusted, after the air flow is stable, nitrogen in the air bottle is humidified by the sprayer 4a and then is conveyed to the mixing container 7 together with coal ash particles in the particle generator 5, the coal ash is heated in the mixing container 7, after being sampled by the first constant-speed sampler 9, the mixture enters the turbulence agglomerator 10, and the coal ash particles collide and agglomerate under the action of the turbulence column 10b and the cross turbulence vortex sheet 10 c.
Connecting the high-speed camera 15 with the computer 14, changing the IP address of the computer, and setting camera parameters such as resolution, sampling rate and exposure time by using control software of the high-speed camera 15 installed on the computer 14, wherein the camera triggering mode is delayed triggering. And adjusting the focal length of the high-speed camera 15 to enable the image in the shooting area to be clear, preparing to shoot the collision and agglomeration phenomenon in the turbulence condenser, and storing the shot video into the computer 14 for subsequent image processing.
A particle sampler is arranged at the outlet of the turbulent agglomerator 10, fine particle samples in front of and behind the turbulent agglomerator are collected, the micro morphology of the fine particle samples is observed, and an electrostatic dust collector 12 is arranged at the tail end of the experimental device and used for removing fine particles.
The gas particle generating device comprises a gas generating device and a particle generating device, the gas source of the gas generating device can be nitrogen, carbon dioxide, air, mixed gas and the like, and the gas source is adjusted according to actual conditions. The air flow is divided into two paths, and the flow rate of the air flow is accurately controlled by the mass flow meter respectively. One path is dry gas; the other path generates wet gas through a sprayer, which can be a Collison sprayer developed by BGI of America. The two paths of gas enter a gas mixer provided with a hygrometer, and the flow of the dry and wet paths of gas can be effectively controlled through a mass flow meter, so that the humidity of the gas entering the mixing container is effectively controlled. In addition, for the mixed gas, a heating belt or a heating pipe is adopted to heat in the mixing container, a high-precision thermocouple is arranged in the mixing container to measure the temperature of the airflow, the power of the heating device is adjusted by a pressure regulator, and the maximum heating temperature of the airflow can reach 220-230 ℃, so that the temperature of the airflow can be effectively controlled.
The core part of the turbulence agglomeration unit is the design of a turbulence device, the turbulence device comprises a turbulence column, turbulence vortex sheets and the like, the turbulence column is used for generating large-scale turbulence, the turbulence vortex sheets are used for generating small-scale turbulence, and the turbulence column and the turbulence vortex sheets can be matched to generate different forms of turbulent flow fields.
The high-speed camera device consists of a high-speed camera, a point light source, a fixed-focus micro lens, a computer and the like, and the camera is connected with the computer to store shot videos. The high-speed camera system can clearly shoot the process of colliding the agglomeration plate among the particles with the particle size of more than 2 mu m.
The device can realize that the air flow speed is controlled to be 0.5-20m/s, the air flow temperature is controlled to be 220-.
Claims (3)
1. The utility model provides an experimental apparatus that controllable micron order granule torrent of humiture is reunited, it includes that gas grain generating device, gas grain hybrid heating device, high-speed camera device and gas grain discharge processing apparatus, characterized by: the gas particle generating device comprises a gas cylinder (1), a mass flow meter (3), a humidifier (4) and a particle generator (5), one end of a sprayer (4 a) of the humidifier (4) extends into a gas mixer (4 b), the gas cylinder (1) is connected with a second three-way valve (2 b) through a first three-way valve (2 a) and a flow meter (3), the gas cylinder (1) is connected with the sprayer (4 a) through the second three-way valve (1 b) and another flow meter (3) through the first three-way valve (2 a), a hygrometer is arranged on the gas mixer (4 b), and the gas mixer (4 b) is connected with a mixing container (7) through a second three-way valve (2 b) through a pipeline;
the gas particle mixing and heating device comprises a mixing container (7) and a thermocouple (8), a heating element (6) is arranged on the outer wall of the mixing container (7), the thermocouple (8) is inserted into the mixing container (7), and the inlet of the mixing container (7) is connected with a gas mixer (4 b) and a particle generator (5) through a pipeline;
the turbulence collision agglomeration device comprises a turbulence agglomeration device (10), observation windows (10 a) are arranged on two sides of the turbulence agglomeration device (10), turbulence columns (10 b) and turbulence vortex sheets (10 c) are arranged in the turbulence agglomeration device (10), the turbulence columns (10 b) are cylindrical, the turbulence vortex sheets (10 c) are of a cross-shaped columnar structure, the turbulence columns (10 b) and the turbulence vortex sheets (10 c) are linearly arranged in a plane perpendicular to the flow direction of airflow, a first constant-velocity sampler (9) is arranged on an inlet pipeline of the turbulence agglomeration device (10), a second constant-velocity sampler (9 a) is arranged on an outlet pipeline, and the inlet pipeline of the turbulence agglomeration device (10) is connected with an outlet of a mixing container (7);
the high-speed camera device comprises a light source (11), a high-speed camera (15) and a computer (14), wherein the light source (11) and the high-speed camera (15) are arranged on the outer side of an observation window (10 a) of the turbulent agglomerator (10), the computer (14) is connected with the high-speed camera (15), and cameras of the light source (11), the observation window (10 a) and the high-speed camera (15) are positioned on the same straight line;
the gas particle emission treatment device comprises an electrostatic dust collector (12) and an induced draft fan (13), an inlet pipeline of the electrostatic dust collector (12) is connected with an outlet of the turbulent flow agglomerator (10), an outlet pipeline of the electrostatic dust collector (12) is connected with the induced draft fan (13), and a third constant-speed sampler (9 b) is arranged on an outlet pipeline of the electrostatic dust collector (12).
2. The experimental device for turbulent agglomeration of micron-sized particles with controllable temperature and humidity according to claim 1, wherein: the heating element (6) adopts a heat transfer belt or a heating pipe.
3. The experimental device for turbulent agglomeration of micron-sized particles with controllable temperature and humidity according to claim 1, wherein: the gas in the gas cylinder (1) adopts at least one of nitrogen, carbon dioxide and air.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010208545.7A CN111337394A (en) | 2020-03-23 | 2020-03-23 | Experimental device for controllable micron order granule torrent of humiture is reunited |
| PCT/CN2020/116765 WO2021189786A1 (en) | 2020-03-23 | 2020-09-22 | Temperature and humidity controllable experimental device for micron-sized particle turbulent flow agglomeration |
| CN202110304947.1A CN112924341A (en) | 2020-03-23 | 2021-03-23 | Experimental device for controllable micron order granule torrent of humiture is reunited |
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| CN202010208545.7A CN111337394A (en) | 2020-03-23 | 2020-03-23 | Experimental device for controllable micron order granule torrent of humiture is reunited |
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| CN111337394A true CN111337394A (en) | 2020-06-26 |
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| CN202110304947.1A Pending CN112924341A (en) | 2020-03-23 | 2021-03-23 | Experimental device for controllable micron order granule torrent of humiture is reunited |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112924341A (en) * | 2020-03-23 | 2021-06-08 | 大连理工大学 | Experimental device for controllable micron order granule torrent of humiture is reunited |
| CN114397231A (en) * | 2022-01-21 | 2022-04-26 | 中国矿业大学 | Visual test device and method for adhesion and desorption of wet particles in gas-solid two-phase flow |
| CN117358420A (en) * | 2023-12-01 | 2024-01-09 | 浙江宜成环保设备有限公司 | Device and method for agglomerating fine lead dust in flue gas |
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| CN113332869B (en) * | 2021-06-23 | 2022-12-23 | 苏州沃美生物有限公司 | Mixing device and method and recombinant escherichia coli plasmid extraction method |
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| CN112924341A (en) * | 2020-03-23 | 2021-06-08 | 大连理工大学 | Experimental device for controllable micron order granule torrent of humiture is reunited |
| WO2021189786A1 (en) * | 2020-03-23 | 2021-09-30 | 大连理工大学 | Temperature and humidity controllable experimental device for micron-sized particle turbulent flow agglomeration |
| CN114397231A (en) * | 2022-01-21 | 2022-04-26 | 中国矿业大学 | Visual test device and method for adhesion and desorption of wet particles in gas-solid two-phase flow |
| CN114397231B (en) * | 2022-01-21 | 2024-04-16 | 中国矿业大学 | Visual test device and method for adhesion and desorption of wet particles in gas-solid two-phase flow |
| CN117358420A (en) * | 2023-12-01 | 2024-01-09 | 浙江宜成环保设备有限公司 | Device and method for agglomerating fine lead dust in flue gas |
| CN117358420B (en) * | 2023-12-01 | 2024-05-31 | 浙江宜成环保设备有限公司 | Device and method for agglomerating fine lead dust in flue gas |
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| WO2021189786A1 (en) | 2021-09-30 |
| CN112924341A (en) | 2021-06-08 |
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