CN109772594B - Control system for strong shearing pulse airflow bubbling - Google Patents
Control system for strong shearing pulse airflow bubbling Download PDFInfo
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- CN109772594B CN109772594B CN201910135634.0A CN201910135634A CN109772594B CN 109772594 B CN109772594 B CN 109772594B CN 201910135634 A CN201910135634 A CN 201910135634A CN 109772594 B CN109772594 B CN 109772594B
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Abstract
The application relates to a control system of strong shear pulse airflow, which comprises an airflow conversion device, a shearing device, a flotation device and a control device; by arranging the airflow conversion device, the stable airflow is converted into the pulse airflow, and the impact force of the airflow is enhanced by converting the continuous airflow into the pulse airflow, so that the dependence on buoyancy in the bubble desorption process can be reduced, bubbles are desorbed in advance at a smaller scale, and the diameter of the formed bubbles is obviously reduced; under the combined action of the airflow conversion device and the shearing device, the size of the bubbles can be reduced to be less than 0.1 mm.
Description
Technical Field
The invention relates to the technical field of flotation, in particular to a control system for strong shear pulse airflow foaming.
Background
The bubbles play an important role in the industries of chemical industry, petrifaction, mineral separation, multiphase heat transfer and the like, wherein the most common application mainly comprises the aspects of mineral flotation, wastewater treatment and the like, and the bubbles are regarded as the primary conditions of heat transfer and mass transfer. Froth flotation is often used for the recovery of mineral particles and the size of the bubbles is an important parameter in the flotation process affecting the recovery. The effective collision of gas bubbles with mineral particles is an important indicator of the gas bubble particle dynamics and also an important factor in the recovery of mineral particles. The probability of bubble-particle collision can be described in terms of the proportional relationship between bubble diameter and particle diameter, namely:
wherein D ispRepresented by the diameter of the particles, DbThe diameter of the bubble is represented. This equation explains the large relationship between the probability of collision and the particle bubble diameter ratio. When the fine mineral particles are recovered, the recovery rate can be improved to a great extent by selecting the air bubbles within the same order of magnitude range, and more medicament dosage is saved.
Common bubble forming techniques of current flotation include mechanical agitation, jet shear, cavitation and dissolved air flotation. The mechanical stirring type foaming flotation has high environmental turbulence, and related researches report that the average shear speed in the flotation machine is as high as 100s-1And the average size of the bubbles is larger (1.2-2.7 mm); jet shearing cuts air into bubbles by using strong shearing when the solution flows through a jet pipe at a high speed, and the average size of the bubbles is 0.5 mm; cavitation utilization solutionThe pressure of the liquid flowing through the Venturi tube at high speed is suddenly reduced into bubbles, the average size can reach below 0.2mm, but the energy consumption is higher; the dissolved air flotation technology firstly dissolves air into solution under high pressure, then the pressure is suddenly reduced to separate out air into bubbles, strong turbulence is not generated, the size of the generated bubbles is small, but the dissolved air flotation needs high-pressure operation, and therefore the cost is high.
Disclosure of Invention
The invention provides a control system for generating strong shear pulse airflow of micro bubbles for solving the existing problems, and the technical scheme is as follows:
a control system of strong shear pulse airflow comprises an airflow conversion device, a shearing device, a flotation device and a control device.
The air flow conversion device comprises an air compressor, a pressure regulating valve, a gas flowmeter and a high-frequency electromagnetic valve, wherein the air compressor, the pressure regulating valve, the gas flowmeter, the high-frequency electromagnetic valve and the air chamber are sequentially connected.
The shearing device comprises a servo motor and a perforated plate, and the servo motor is in driving connection with the perforated plate.
The lower part of the flotation device is provided with an air chamber, and the porous plate is positioned above the air chamber.
The control device converts the steady-state airflow into pulse airflow by controlling the frequency of the high-frequency electromagnetic valve and the switching time in one period, and controls the rotation speed of the porous plate through the servo motor, so that the impact strength in the bubble forming direction and the shearing force in the vertical direction of the formed bubbles are controlled.
Furthermore, a gear transmission device is arranged between the servo motor and the porous plate, an output shaft of the servo motor is connected with the gear transmission device, and a transmission shaft of the gear transmission device is connected with the porous plate.
Furthermore, the gear transmission device comprises a first bevel gear and a second bevel gear, the first bevel gear is connected with the horizontally arranged servo motor, the second bevel gear is connected with the vertically arranged transmission shaft, and the first bevel gear is meshed with the second bevel gear.
Further, the transmission shaft is connected with the flotation device in a rotating and sealing mode.
Compared with the prior art, the invention has the following advantages:
(1) through setting for the parameter of air current conversion equipment, can convert steady state air current into pulsed air current, strengthen the air current impact force with the mode of continuous air current conversion into pulsed air current, can reduce the reliance to buoyancy in the bubble desorption process to make the bubble desorb in advance with less yardstick, compare with continuous air current, the diameter of the bubble that forms is obviously reduced (the diameter of bubble can be controlled below 0.2 mm).
(2) The air flow conversion device provided by the invention is composed of an air compressor, a pressure regulating valve, a gas flowmeter and a high-frequency electromagnetic valve, the frequency of the high-frequency electromagnetic valve and the switching time in one period are controlled by a control device, the stable air flow is converted into the pulse air flow, the structure is simple, and the air pressure is not required to be very large and extra energy resources are not required to be consumed.
(3) According to the invention, by adding the shearing device, the intensity of the impact force in the foaming direction is enhanced, the shearing force is added in the vertical direction of the foaming direction, and the size of the bubble can be reduced to be less than 0.1mm under the combined action of the airflow conversion device and the shearing device.
Drawings
FIG. 1 is a schematic diagram of the control of the strong shear pulsed gas flow of the present invention.
Figure 2 is a top view of the perforated plate.
In the drawings: the device comprises an air compressor, a gas flowmeter, a pressure regulating valve, a high-frequency electromagnetic valve, a connecting element, a gear transmission device, a servo motor, an air chamber, a porous plate and a control device, wherein the air compressor is 1, the gas flowmeter is 2, the pressure regulating valve is 3, the high-frequency electromagnetic valve is 4, the connecting element is 5, the gear transmission device is 6, the servo motor is 7, the air chamber is 8, the porous plate is 9, and the control device is 10.
Detailed Description
Referring to figures 1-2: a strong shear pulse airflow control system comprises the following two parts: (1) the process system comprises an airflow conversion device, a shearing device and a flotation device, wherein the airflow conversion device comprises an air compressor 1, a pressure regulating valve 2, a gas flowmeter 3, a high-frequency electromagnetic valve 4 and the like, and the shearing device comprises a servo motor 7, a gear transmission device 6 and a porous plate 9; (2) the control system adjusts the air inlet pressure through the pressure adjusting valve 2, the air flow meter 3 adjusts the air inlet flow, and the control device 10 controls the frequency of the high-frequency electromagnetic valve 4, the switching time in one period, the rotating speed of the servo motor 7 and the like.
The steady-state air flow is filtered and compressed by the air compressor 1 to remove moisture and impurities from the air. The filtered and compressed gas passes through the pressure regulating valve to regulate the pressure of the gas, then passes through the gas flowmeter 3 to regulate a knob on the gas flowmeter, so that the gas flows out at a certain flow rate, and the gas flow is a steady-state gas flow with a fixed flow rate. The gas with a certain flow is introduced into the high-frequency electromagnetic valve 4, the high-frequency electromagnetic valve is a switch capable of rapidly opening and closing the gas flow, the control panel 10 connected with the high-frequency electromagnetic valve can regularly regulate and control the electromagnetic valve according to a certain frequency and the switching time in a period, and the forming mode of the gas flow is converted from a stable state to a pulse type through an electromagnetic valve element. The pulsed gas flow leads the gas via the connecting element 5 into the gas chamber 8, through the pores of the perforated plate 9, gas bubbles can form into the liquid phase. By using a pulsed gas flow through the perforated plate 9, the diameter of the bubbles can be controlled below 0.2mm, and the formation mechanism is:
the micropore foaming process is essentially embodied by force application, and bubbles are subjected to the combined action of a plurality of acting forces before desorption, wherein the acting forces comprise buoyancy, airflow impact force, gas-liquid interface tension, hydrostatic pressure, fluid viscosity force and gas-solid interface liquid film adsorption force, the buoyancy, the airflow impact force and the gas-liquid interface tension belong to desorption force, and the hydrostatic pressure, the fluid viscosity force and the gas-solid interface liquid film adsorption force belong to anti-desorption force; the critical condition of desorption is that the desorption force is larger than the anti-desorption force, and the resultant force exerted on the bubbles before desorption is in a dynamic balance state; in the continuous airflow state, the impact force of the airflow is not strong, and the bubble desorption mainly depends on buoyancy; in general, bubbles need to be longer than ten times of the size of the micropores to generate enough buoyancy to realize desorption, so that the size of the generated bubbles is often larger; the mode of converting continuous airflow into pulse airflow strengthens airflow impact force, can reduce the dependence on buoyancy in the bubble desorption process, thereby leading the bubbles to be desorbed in advance with smaller scale and leading the diameter of the bubbles to be smaller.
Continuing to refer to the attached figure 1, in order to further reduce the diameter of the bubbles, the porous plate is in driving connection with a servo motor, and after the servo motor 7 is started, the porous plate 9 is driven to rotate through a gear transmission device 6; when the pulse airflow is introduced, the shearing device is started, the strength of the impact force in the foaming direction is enhanced, the shearing force is added in the vertical direction of the foaming direction, and the size of the bubbles can be reduced to be less than 0.1mm under the combined action of the airflow conversion device and the shearing device.
The foregoing detailed description is intended to illustrate and not limit the invention, and any modifications and variations of the invention within the spirit and scope of the claims are intended to fall within the scope of the invention.
Claims (5)
1. A control system of strong shear pulse airflow is characterized by comprising an airflow conversion device, a shearing device, a flotation device and a control device; the air flow conversion device comprises an air compressor, a pressure regulating valve, a gas flowmeter and a high-frequency electromagnetic valve, wherein the air compressor, the pressure regulating valve, the gas flowmeter, the high-frequency electromagnetic valve and the air chamber are sequentially connected; the shearing device comprises a servo motor and a perforated plate, and the servo motor is in driving connection with the perforated plate; the lower part of the flotation device is provided with an air chamber, the porous plate is positioned above the air chamber, the pulsed airflow leads the air into the air chamber through the connecting element, and bubbles are formed through micropores on the porous plate and enter a liquid phase; the control device converts the steady-state airflow into pulse airflow by controlling the frequency of the high-frequency electromagnetic valve and the switching time in one period, the pulse airflow is used for forming bubbles with the diameter of below 0.2mm, meanwhile, the control device controls the rotating speed of the porous plate through the servo motor, further controls the impact force intensity in the bubble forming direction and the shearing force in the vertical direction of the formed bubbles, and reduces the size of the bubbles to be below 0.1mm under the combined action of the airflow conversion device and the shearing device, wherein the steady-state airflow is filtered and compressed through the air compressor to remove moisture and impurities in the air.
2. A control system of strong shear pulse airflow according to claim 1, wherein said control means comprises a Programmable Logic Controller (PLC) and a high speed camera through which changes in the form of each stage of bubble formation and the time of bubble formation are observed.
3. A control system of strong shear pulse airflow according to claim 2, wherein a gear transmission device is arranged between said servo motor and said porous plate, the output shaft of said servo motor is connected with said gear transmission device, and the transmission shaft of said gear transmission device is connected with the porous plate.
4. A control system of strong shear pulse airflow according to claim 3, wherein said gear transmission means comprises a first bevel gear and a second bevel gear, said first bevel gear is connected to said horizontally disposed servo motor, said second bevel gear is connected to said vertically disposed transmission shaft, and said first bevel gear and said second bevel gear are engaged.
5. A control system of strong shear pulsed airflow according to claim 4, characterized in that said drive shaft is in rotary sealed connection with said flotation device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910135634.0A CN109772594B (en) | 2019-02-25 | 2019-02-25 | Control system for strong shearing pulse airflow bubbling |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910135634.0A CN109772594B (en) | 2019-02-25 | 2019-02-25 | Control system for strong shearing pulse airflow bubbling |
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| CN109772594A CN109772594A (en) | 2019-05-21 |
| CN109772594B true CN109772594B (en) | 2021-10-12 |
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| CN109939836A (en) * | 2019-04-28 | 2019-06-28 | 郑州大学 | A kind of control application system of air pulse |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2673724A (en) * | 1951-07-14 | 1954-03-30 | Galigher Company | Impeller for flotation machines |
| US4639313A (en) * | 1985-07-05 | 1987-01-27 | The Deister Concentrator Company | Floatation apparatus for concentration of minerals from high water content aqueous slurries |
| CN102989592A (en) * | 2012-12-13 | 2013-03-27 | 广西华锡集团股份有限公司 | Multi-air-stream pulse injection-type floatation machine |
| CN108772203A (en) * | 2018-07-01 | 2018-11-09 | 张大伟 | A kind of tin ore mine factory ore dressing flotation device |
| CN108906341A (en) * | 2018-06-19 | 2018-11-30 | 安徽枫雅轩科技信息服务有限公司 | Flotation device is used in a kind of screening of concentrate |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208050179U (en) * | 2018-03-06 | 2018-11-06 | 山东烟台鑫泰黄金矿业有限责任公司 | A kind of stirring-type flotation cell |
-
2019
- 2019-02-25 CN CN201910135634.0A patent/CN109772594B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2673724A (en) * | 1951-07-14 | 1954-03-30 | Galigher Company | Impeller for flotation machines |
| US4639313A (en) * | 1985-07-05 | 1987-01-27 | The Deister Concentrator Company | Floatation apparatus for concentration of minerals from high water content aqueous slurries |
| CN102989592A (en) * | 2012-12-13 | 2013-03-27 | 广西华锡集团股份有限公司 | Multi-air-stream pulse injection-type floatation machine |
| CN108906341A (en) * | 2018-06-19 | 2018-11-30 | 安徽枫雅轩科技信息服务有限公司 | Flotation device is used in a kind of screening of concentrate |
| CN108772203A (en) * | 2018-07-01 | 2018-11-09 | 张大伟 | A kind of tin ore mine factory ore dressing flotation device |
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