Defoaming system of coal slime concentration tank

Abstract

The invention relates to the technical field of coal slime concentration equipment, in particular to a defoaming system of a coal slime concentration tank. By innovatively designing the combined layout of the circular pesticide storage box and the rectangular pesticide storage box and combining the first nozzle and the second nozzle which are arranged in the circumferential direction and are adjustable in spraying target distance, a variable-diameter annular and variable-size rectangular staggered full-coverage spraying area is formed on the liquid level of the concentration tank. According to the unique spraying mode, the defoaming agent can be accurately and comprehensively sprayed to all positions of the coal slime bubbles, and compared with a traditional defoaming mode, the contact area and efficiency of the agent and the coal slime bubbles are greatly improved, so that the coal slime bubbles formed on the liquid level of the concentration tank are more effectively eliminated, and the service life of the concentration tank is prolonged. The negative effects of coal slime bubbles on the operation of the concentration tank and the subsequent production links are obviously reduced, such as the influence on the coal slime precipitation effect and the increase of the equipment operation risk, and the efficient and stable operation of the coal slime concentration process is powerfully guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of slime thickening equipment, specifically a defoaming system for slime thickening tanks. Background Art

[0002] Under the background of the refined processing of coal resources, modern coal preparation plants undertake the important mission of improving coal quality and reducing environmental pollution. The slime water treatment link, as a key part of it, directly affects the production efficiency and environmental protection benefits of the entire coal preparation plant. Currently, the vast majority of coal preparation plants use thickening tanks to treat slime water, and this link is the core hub of the entire slime water treatment process.

[0003] The main equipment supporting the thickening tank is a thickener. The common rake thickener works based on gravity sedimentation. When the slime water is transported to the thickening tank, under the action of the slowly rotating rake frame of the thickener, the slime water flows slowly in a spiral shape in the tank body. Among them, the denser coal slime particles gradually sink under the action of gravity, while the relatively clear water flows upward. After a period of sedimentation and separation, efficient stratification of fine coal slime and clarified water is achieved, and the clarified water can be discharged from the overflow port to achieve the purpose of purification and recycling.

[0004] However, the diversity of coal resources makes the sources of raw coal mining extremely complex. The composition and properties of raw coal from different mining areas and different coal seams vary significantly. The slime water produced after washing and processing not only has significant fluctuations in concentration but also, due to various minerals, organic substances, etc. contained in the raw coal, the distribution of surface active substances in some slime water slurries is severely uneven. When these surface active substances aggregate, they will greatly reduce the surface tension of the slime water slurry, making it much lower than the normal level. During the static sedimentation process in the thickening tank, the coal slime particles will adsorb with the tiny bubbles escaping from the water, and a large number of coal slime - bubble aggregates continuously accumulate, and finally a large number of stable coal slime water bubbles are formed on the liquid surface of the thickening tank.

[0005] The existence of these coal slime water bubbles has many negative impacts on the slime water treatment process. On the one hand, they hinder the gas - liquid exchange in the thickening tank, making it difficult for the gas dissolved in the water to escape, affecting the sedimentation effect of the slime water; on the other hand, a large number of coal slime water bubbles form a dense foam layer on the liquid surface, like a barrier, seriously interfering with the normal drainage of the overflow port. The clarified water that should have flowed out smoothly cannot flow out in time due to the obstruction of the foam layer, resulting in the rise of the water level in the thickening tank and a significant decrease in the treatment efficiency. In the long run, it will also lead to the deterioration of the circulating water quality and affect the normal production operation of the entire coal preparation plant, so it needs to be solved urgently. Summary of the Invention

[0006] In order to avoid and overcome the technical problems existing in the prior art, the present invention provides a defoaming system for a slime thickening tank. The present invention can effectively eliminate the slime water bubbles formed on the liquid surface of the thickening tank and reduce the negative impacts brought by the slime water bubbles.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] The defoaming system for a slime thickening tank includes a circular medicine storage tank installed on the central support column of a rake thickener. A plurality of first nozzles are arranged on the circular medicine storage tank, and the medicine stored inside it can be sprayed onto the liquid surface of the thickening tank through the first nozzles; the first nozzles are arranged in sequence circumferentially around the central support column, and the spraying target distance of each first nozzle is adjustable in real time, so as to form a variable-diameter annular spraying area on the liquid surface of the thickening tank; it also includes a rectangular medicine storage tank installed on the rake of the rake thickener, and the rectangular medicine storage tank extends along the length direction of the rake; a plurality of second nozzles are arranged on both sides of the rectangular medicine storage tank, and the spraying target distance of each second nozzle is adjustable in real time, so as to form a variable-size rectangular spraying area on the liquid surface of the thickening tank; the variable-diameter annular spraying area and the variable-size rectangular spraying area intersect with each other to perform full-coverage spraying on the liquid surface.

[0009] As a further solution of the present invention: A first booster pump is connected and arranged on the circular medicine storage tank, and the outlet end of the first booster pump is connected and installed with an annular first main pipe, and the first main pipe is sleeved outside the circular medicine storage tank. Each first nozzle is connected and installed on the first main pipe through a first branch pipe, and a pitching adjustment device for adjusting its pitching angle is installed at each first nozzle.

[0010] As a further solution of the present invention: A second booster pump is connected and arranged on the rectangular medicine storage tank, and the outlet end of the second booster pump is connected and installed with a second main pipe, and the second main pipe is in a rectangular shape framed outside the rectangular medicine storage tank. Each second nozzle is connected and installed on the second main pipe in a rectangular arrangement through a second branch pipe, and a pitching adjustment device for adjusting its pitching angle is also installed at each second nozzle.

[0011] As a further solution of the present invention: An ultrasonic emission device that can rotate with the frame and emit ultrasonic waves to the liquid surface is also installed on the frame.

[0012] As a further solution of the present invention: A real-time monitoring device for the surface tension of slime water is also arranged at the liquid surface of the thickening tank.

[0013] As a further solution of the present invention: The real-time monitoring device for the surface tension of slime water includes surface tension sensors, and each surface tension sensor is evenly arranged at the liquid surface through a bracket.

[0014] As a further solution of the present invention: The brackets are arranged at the edge of the thickening tank, extend into the thickening tank, and avoid the rotating rake.

[0015] As a further solution of the present invention: the pressure of the first booster pump is adjustable to adjust the spraying target distance of the first nozzle.

[0016] As a further solution of the present invention: the pressure of the second booster pump is adjustable to adjust the spraying target distance of the first nozzle.

[0017] The maximum spraying diameter of the variable-diameter annular spraying area is the inner diameter of the thickener, and the minimum diameter is the diameter of the circle formed by enclosing the outlets of each nozzle; the length of the variable-size rectangular spraying area is the difference between the inner radius of the thickener and the outer radius of the central support column.

[0018] As a further solution of the present invention: the total real-time spraying flow rate of the active agent corresponding to the circular chemical storage tank and the rectangular chemical storage tank is Q spray (t):

[0019]

[0020] The ultrasonic power of the ultrasonic emission device is P ultra (t):

[0021]

[0022] In the formula, K p represents the proportionality coefficient; in the formula of the total real-time spraying flow rate of the active agent, it is used to reflect the proportional adjustment effect of the difference between the target surface tension and the real-time monitored surface tension on the spraying flow rate, and reflects the parameter of the proportional control link. K i represents the integral coefficient, which is used to adjust the integral term of the difference between the target surface tension and the real-time monitored surface tension. In the control of the spraying flow rate of the active agent, it can eliminate the static error and reflects the parameter of the integral control link. γ(τ) represents the historical monitored value of the liquid surface surface tension in the integral time domain; τ represents the integral variable; dτ represents the differential of the integral variable. K d represents the ratio between the desorption rate constant and the adsorption rate constant; γ set represents the target surface tension; γ(t) represents the real-time monitored value of the liquid surface surface tension; γ represents the liquid surface surface tension; β represents the ultrasonic efficiency coefficient; e represents the natural constant; α represents the attenuation coefficient of the slime water to ultrasonic waves; d represents the ultrasonic action depth.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] 1. Through the innovative design of the combined layout of the circular medicine storage tank and the rectangular medicine storage tank, and in combination with the first and second nozzles arranged circumferentially with adjustable spraying target distances, the present invention realizes the formation of a full-coverage spraying area with an alternating variable-diameter ring and variable-size rectangle on the surface of the thickener. This unique spraying mode can accurately and comprehensively spray the defoaming agent to various parts of the coal slime water bubbles. Compared with the traditional defoaming method, it greatly increases the contact area and efficiency between the agent and the coal slime water bubbles, and thus more effectively eliminates the coal slime water bubbles formed on the surface of the thickener, significantly reducing the negative impacts brought by the coal slime water bubbles to the operation of the thickener and subsequent production processes, such as affecting the coal slime sedimentation effect and increasing the operation risk of equipment, etc., and effectively ensuring the efficient and stable operation of the coal slime thickening process.

[0025] 2. A first booster pump is equipped for the circular medicine storage tank, and each first nozzle is connected through a first main pipe and a first branch pipe. The setting of the first booster pump provides stable and strong power for the medicine transportation, which can ensure that the medicine is transported to each first nozzle at an appropriate pressure and flow rate, and guarantees the uniform spraying of the medicine. The coaxial arrangement of the first main pipe and the circular medicine storage tank and the connection mode of the first branch pipe make the medicine transportation path reasonable, reduce unnecessary resistance and pressure loss, ensure that each first nozzle can work stably and efficiently, further improve the spraying quality and defoaming effect of the variable-diameter ring spraying area, and provide reliable power and transportation guarantee for the stable operation of the entire defoaming system.

[0026] 3. A second booster pump is configured for the rectangular medicine storage tank, and at the same time, a rectangular second main pipe framed outside the rectangular medicine storage tank and second branch pipes are used to connect each second nozzle. This structural design not only provides sufficient power for the medicine transportation in the rectangular medicine storage tank, but also the rectangular second main pipe matches the outer shape of the rectangular medicine storage tank, which can evenly distribute the medicine to each second nozzle, ensuring the formation of a stable and uniform variable-size rectangle spraying area on the surface of the thickener. The reasonable pipeline layout and power configuration reduce the energy loss and uneven spraying problems during the medicine transportation process, cooperate with the spraying area of the circular medicine storage tank, and jointly achieve efficient defoaming of the surface of the thickener, improving the overall performance and reliability of the defoaming system.

[0027] 4. An ultrasonic emission device that can rotate with the frame and emit ultrasonic waves to the liquid surface is added to the frame. Ultrasonic waves have unique cavitation effects and mechanical effects, which can destroy the surface tension and membrane structure of the coal slime water bubbles and accelerate the rupture of the water bubbles. Combined with the defoaming of the agent, it forms a dual defoaming mechanism with the synergistic effect of physical defoaming and chemical defoaming. The ultrasonic emission device rotates with the frame, which can perform ultrasonic treatment on the surface of the thickener in all directions, making up for the possible problem of insufficient local coverage in the defoaming of the agent, further enhancing the defoaming effect, especially having a significant elimination effect on stubborn and difficult-to-eliminate coal slime water bubbles, and effectively improving the ability of the defoaming system to cope with complex working conditions.

[0028] 5. Arrange a real-time monitoring device for the surface tension of coal slurry water at the liquid surface of the thickening tank. The surface tension of coal slurry water is one of the key factors affecting the formation and stability of coal slurry bubbles. By monitoring the surface tension in real time, the status information of the coal slurry water in the thickening tank can be obtained in a timely manner. According to the changes in surface tension, the working parameters of the defoaming system, such as the spraying amount of the agent and the intensity of the ultrasonic emission, can be dynamically adjusted to realize the intelligent operation of the defoaming system. Compared with the traditional empirical defoaming operation, this real-time monitoring and dynamic adjustment method can more accurately control the defoaming process, improve the defoaming efficiency, reduce the consumption of agents, avoid the waste of resources and poor defoaming effect caused by excessive or insufficient defoaming, and make the defoaming system more energy-saving and efficient.

[0029] 6. Surface tension sensors, as key detection components, accurately and sensitively measure the surface tension of coal slurry. Their uniform placement ensures effective collection of surface tension data across the entire thickener, avoiding data deviations and monitoring blind spots caused by irrational distribution of detection points. This precise data collection provides a reliable basis for precise control of the defoaming system, enabling the system to promptly and accurately adjust the defoaming strategy based on the actual surface tension of the coal slurry, ensuring the stability and reliability of the defoaming effect and providing strong support for the refined management of the coal slurry concentration process.

[0030] 7. The bracket is positioned at the edge of the thickening tank and extends into the tank, avoiding the rotating rake frame. This bracket arrangement ensures that the surface tension sensor can effectively collect surface tension data from the thickening tank liquid surface while cleverly avoiding the rotating area of the rake thickener rake frame. This avoids mechanical interference and collision risks between the bracket and the rake frame, ensuring the normal operation of the rake thickener and defoaming system components. Furthermore, the appropriate bracket extension length allows the sensor to be as close as possible to the center of the liquid surface, obtaining more comprehensive and accurate surface tension data. This further enhances the effectiveness and reliability of the monitoring device and ensures the coordinated and stable operation of the defoaming system and thickening tank equipment.

[0031] 8. The pressure of the first booster pump is adjustable, enabling the adjustment of the first nozzle's spray target distance. This design allows the spray range of the variable-diameter annular spray area to be flexibly adjusted according to actual operating conditions. In complex situations such as uneven distribution of coal slime bubbles and varying concentrations, the pressure of the first booster pump can be adjusted to increase or decrease the first nozzle's spray target distance, allowing the agent to more accurately cover the area requiring defoaming, improving agent utilization efficiency and avoiding agent waste. At the same time, the flexible and adjustable spray target distance also enhances the defoaming system's adaptability to concentrators of different sizes and operating conditions, better meeting diverse defoaming needs and improving the system's versatility and practicality.

[0032] 9. The pressure of the second booster pump is adjustable to adjust the injection target distance of the second nozzle. Similar to the advantage of the adjustable pressure of the first booster pump, it provides flexibility for adjusting the spraying range of the variable-size rectangular spraying area. By adjusting the pressure of the second booster pump, the injection target distance of the second nozzle can be accurately controlled according to the actual distribution and characteristics of the coal slime water bubbles in the thickener, enabling the rectangular spraying area to better cooperate with the variable-diameter annular spraying area and achieving the best defoaming coverage effect on the thickener liquid surface. This design with adjustable pressure further optimizes the spraying strategy of the defoaming system, improves the accuracy and effectiveness of defoaming, can better handle various complex coal slime thickening conditions, and ensures the stable and efficient operation of the defoaming system under different conditions.

[0033] 10. The set size ranges of the variable-diameter annular spraying area and the variable-size rectangular spraying area are as follows: the maximum spraying diameter of the variable-diameter annular spraying area is the inner diameter of the thickener, and the minimum diameter is the diameter of the circle formed by enclosing at the outlet of each nozzle; the length of the variable-size rectangular spraying area is the difference between the inner radius of the thickener and the outer radius of the central support column. These precise size limitations ensure that the two spraying areas can cooperate with each other and seamlessly connect in design, achieving complete coverage of the thickener liquid surface and avoiding defoaming blind spots. The reasonable size design also provides clear parameter bases for the installation, commissioning, and operation of the defoaming system, facilitating operators to accurately arrange equipment and adjust parameters according to the specific specifications of the thickener, ensuring that the defoaming system can achieve the best defoaming effect in thickeners of different specifications, and improving the scientificity and standardization of the defoaming system design. Description of the Drawings

[0034] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0035] Figure 2 It is a schematic diagram of the structure of the circular chemical agent injection device in the present invention.

[0036] Figure 3 It is a schematic diagram of the structure of the rectangular chemical agent injection device in the present invention.

[0037] In the figure: 10, circular chemical agent injection device; 11, circular chemical agent storage tank; 12, first nozzle; 20, rectangular chemical agent injection device; 21, rectangular chemical agent storage tank; 30, rake frame; 40, ultrasonic emission device; 50, real-time monitoring device for the surface tension of coal slime water; 60, control system. Detailed Embodiment

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0039] Please refer to Figures 1 to 3 , in the embodiments of the present invention, the usage process of the defoaming system for the slime thickening tank is as follows:

[0040] I. Install the overall system

[0041] On the central support column of the rake thickener, the circular medicine storage tank 11 in the circular medicine spraying device 10 is firmly installed by welding or bolt connection to ensure that it will not shake or displace during the operation of the equipment. The capacity of the circular medicine storage tank 11 is reasonably designed according to the size of the thickening tank and the expected usage amount of the defoaming agent. On the top or side of the circular medicine storage tank 11, a plurality of first nozzles 22 are evenly arranged at a predetermined angle and spacing, and each first nozzle 22 is arranged in sequence circumferentially around the central support column. There is partial overlap between the circular spraying areas of adjacent first nozzles 22 on the liquid surface of the thickening tank, and then the circular spraying areas formed by each first nozzle 22 arranged in sequence circumferentially around the central support column form a complete annular spraying area.

[0042] Each first nozzle 22 is also connected through a common pitching adjustment device to drive each first nozzle 22 to swing up and down, so that the diameter of the annular spraying area can gradually become larger or smaller, thereby forming a variable-diameter annular spraying area.

[0043] The rectangular medicine storage tank 21 in the rectangular medicine spraying device 20 is installed on the rake 30 of the rake thickener so that it extends along the length direction of the rake 30, and a fixed bracket can be used to reliably connect the rectangular medicine storage tank 21 with the rake 30. On both sides of the rectangular medicine storage tank 21, a plurality of second nozzles are also arranged at a certain spacing to ensure that the second nozzles can cover the corresponding area of the liquid surface of the thickening tank. There is partial overlap between the circular spraying areas of adjacent second nozzles on the liquid surface of the thickening tank, and then the circular spraying areas formed by each second nozzle arranged in sequence along the rectangle form a complete rectangular spraying area. Each second nozzle is also connected through a common pitching adjustment device to drive each second nozzle to swing up and down, so that the size of the rectangular spraying area can gradually become larger or smaller, thereby forming a variable-size rectangular spraying area.

[0044] II. Install and connect the medicine delivery system

[0045] On the circular chemical storage tank 11, a first booster pump is arranged in a pipeline connection. The model of the first booster pump is selected according to the characteristics of the chemical agent, as well as the required conveying pressure and flow rate. The outlet end of the first booster pump is connected to a first main pipe, and the first main pipe is arranged coaxially with the circular chemical storage tank 11. Flange connection or welding is used to ensure a tight connection and prevent chemical agent leakage. Each first nozzle 22 is connected to the first main pipe through a first branch pipe. The diameter of the first branch pipe is designed according to the flow rate requirement of the first nozzle 22 to ensure that the chemical agent can be evenly conveyed to each first nozzle 22. Flow meters are installed on the first main pipe and the second main pipe to monitor the spraying amount of the active agent in real time.

[0046] For the rectangular chemical storage tank 21, a second booster pump is also arranged in a pipeline connection. The selection principle of the second booster pump is the same as that of the first booster pump. The outlet end of the second booster pump is connected and installed with a rectangular second main pipe, and the second main pipe is framed outside the rectangular chemical storage tank 21 and fixed by welding or bolt connection. Each second nozzle is connected to the second main pipe through a second branch pipe to ensure that the chemical agent can be stably and evenly sprayed out from the second nozzle, forming a stable variable-size rectangular spraying area on the surface of the thickener.

[0047] III. Installation of ultrasonic emission device

[0048] On the frame of the rake thickener, an ultrasonic emission device 40 that can rotate with the frame is installed. A rotary bearing can be used to connect the ultrasonic emission device 40 to the frame to ensure its flexible rotation. The emission direction of the ultrasonic emission device 40 faces the surface of the thickener, and its emission power and frequency can be adjusted according to the actual defoaming requirements. During the installation process, ensure that the wiring of the ultrasonic emission device 40 is correct to avoid affecting its normal operation due to wiring problems.

[0049] IV. Installation of real-time monitoring device for surface tension of coal slime water

[0050] The surface tension sensors are evenly arranged at the surface of the thickener through brackets. The brackets are made of corrosion-resistant and high-strength materials, such as stainless steel. The brackets are arranged at the edge of the thickener and extend into the thickener. When designing the extension length and angle of the brackets, fully consider the rotation trajectory of the rake 30 of the rake thickener to ensure that the brackets and the rotating rake 30 avoid each other to prevent collision. Each surface tension sensor is connected to the control system 60 through a wire to transmit the real-time monitored surface tension data of the coal slime water to the control system 60. The control system 60 uses a computer to process relevant data.

[0051] V. System operation and regulation

[0052] When the coal slime thickening tank is in operation, the real-time monitoring device 50 for the surface tension of coal slime water starts to work. The surface tension sensor continuously collects the surface tension data of the liquid level in the thickening tank and transmits the data to the control system 60. The control system 60 analyzes and processes the data, and judges the situation of the coal slime water bubbles in the current thickening tank according to the preset surface tension threshold and the actual monitoring data.

[0053] If defoaming operation is required, the control system 60 adjusts the pressures of the first booster pump and the second booster pump according to the distribution and severity of the coal slime water bubbles. By increasing or decreasing the pressure of the first booster pump, the spraying target distance of the first nozzle 22 is adjusted, and the size of the variable-diameter annular spraying area is changed; similarly, the pressure of the second booster pump is adjusted, the spraying target distance of the second nozzle is controlled, and the size of the variable-size rectangular spraying area is adjusted, so that the two spraying areas intersect with each other to achieve full-coverage spraying of the liquid level in the thickening tank. The spraying target distance refers to the distance between the nozzle outlet and the contact point of the liquid level in the thickening tank, which can be vertical contact or inclined contact.

[0054] At the same time, the control system 60 starts the ultrasonic emission device 40 according to the actual situation. The ultrasonic emission device 40 rotates with the frame and emits ultrasonic waves to the liquid level in the thickening tank. Utilizing the cavitation effect and mechanical effect of ultrasonic waves, and acting synergistically with the chemical agent defoaming, it accelerates the rupture of the coal slime water bubbles and achieves the purpose of efficient defoaming. During the defoaming process, the control system 60 continuously monitors the surface tension data of the coal slime water and adjusts the working parameters of the defoaming system in real time according to the data change to ensure that the defoaming effect reaches the best state.

[0055] During the operation of the system, the operator can view in real time through the control panel information such as the operation status of each component of the system, the surface tension data of the coal slime water, and the defoaming effect, and can manually adjust the system parameters according to the actual needs to achieve flexible control of the defoaming system.

[0056] VI. Regulation Process of the Control System

[0057] 1. The surfactant reduces the surface tension γ of the coal slime water in the following ways:

[0058] Hydrophobic end adsorption: The hydrophobic chain of the surfactant adsorbs on the bubble surface, and the hydrophilic end extends into the water.

[0059] Gibbs adsorption effect: The surfactant accumulates at the gas-liquid interface, reducing the interfacial energy.

[0060] Key equation Gibbs adsorption equation:

[0061]

[0062] Γ: Excess concentration of the surfactant on the liquid surface, mol / m2;

[0063] c: The concentration of slime water body, mol / L;

[0064] R: The gas constant, 8.314 J / mol·K;

[0065] T: The temperature of slime water, K;

[0066] Combined with the Langmuir adsorption kinetics and diffusion control model:

[0067]

[0068] k ads : The adsorption rate constant, m 3 / mol·s;

[0069] k des : The desorption rate constant, l / s;

[0070] Γ ∞ : The saturated adsorption capacity, mol / m 2 ;

[0071] At steady-state desorption equilibrium:

[0072]

[0073] 2. The quantitative relationship between surface tension and concentration needs to be corrected by the Szyszkowski equation: For the slime water system containing coal particles and electrolytes:

[0074] γ = γ0 - a·ln(1 + b·c) - λ·c Na + (4)

[0075] γ0: The surface tension of pure water, 72 mN / m;

[0076] a, b: The characteristic constants of the surfactant obtained by experimental fitting;

[0077] λ: The ionic strength correction coefficient of electrolytes such as NaOH;

[0078] c Na +: The concentration of sodium ions, mol / L;

[0079] Calculation of spraying concentration:

[0080] To achieve the target surface tension γ set , it is necessary to solve:

[0081]

[0082] The dynamic control of the chemical agent spraying system includes the following parts:

[0083] Mass transfer model:

[0084] Consider the influence of the nozzle rotation angular velocity ω on the agent diffusion:

[0085]

[0086] D: Surfactant diffusion coefficient m 2 / s;

[0087] Q sparay : Spraying flow rate m 3 / s;

[0088] R: Nozzle rotation radius m;

[0089] h: Liquid film thickness m;

[0090] Steady-state approximate solution when the rotational centrifugal force is dominant:

[0091]

[0092] R pool : Thickener radius m;

[0093] Ultrasonic synergistic defoaming effect:

[0094] Ultrasonic power P ultra Relationship with the surface tension correction amount:

[0095]

[0096] β: Experimentally calibrated ultrasonic efficiency coefficient;

[0097] α: Attenuation coefficient of coal slime water to ultrasonic waves 1 / m;

[0098] d: Ultrasonic action depth m;

[0099] Real-time feedback control system:

[0100] PID control equation, adjust the total spraying flow rate Q spray (t) and ultrasonic power P ultra (t):

[0101]

[0102] 3. Parameter optimization objective function:

[0103] Minimize the energy consumption and surface tension deviation:

[0104]

[0105] ω1, ω2, ω3: Weight coefficients, which need to be adjusted according to the working conditions.

[0106] Through the device structure design, dynamic monitoring mechanism and mathematical model coupling, the present invention organically integrates the total spraying flow rate and ultrasonic power to form a collaborative defoaming system. Double storage tank spraying network: The circular storage tank 11 is installed on the central support column of the thickener, and a variable-diameter annular spraying area is formed through the circumferentially arranged first nozzles; the rectangular storage tank 21 extends along the length direction of the rake, and the second nozzles on both sides form a variable-size rectangular spraying area. The two cover the liquid surface alternately, providing hardware support for the precise spraying of the agent. Integration of ultrasonic emission device 40: An ultrasonic emission device 40 that can rotate with the frame is installed on the frame of the rake 30, and its emission direction is towards the liquid surface, covering the same area as the agent spraying area, realizing the spatial coordination of physical defoaming (ultrasonic) and chemical defoaming (agent). Through "spatial layout coordination + real-time data feedback + mathematical model coupling", the device structure, spraying flow rate and ultrasonic power are integrated into an adaptive defoaming system, which not only fundamentally reduces the surface tension by the chemical action of the agent, but also accelerates the bubble rupture through the physical action of ultrasonic waves, and finally realizes the precise and efficient elimination of coal slime water bubbles.

[0107] 4. Implementation steps:

[0108] Experimental calibration parameters: Obtain parameters such as a, b, λ, β, α through laboratory tests.

[0109] Install monitoring devices: Install multi-point surface tension sensors in the thickening tank, and it is recommended that the spacing ≤ 2m.

[0110] Initialize control parameters: Set K based on the properties of coal slime water p , K i , K d Initial values.

[0111] Start collaborative control: Simultaneously turn on the circular + strip devices for agent spraying and ultrasonic defoaming.

[0112] Dynamic optimization: Adopt rolling horizon control (RHC) to update the model parameters in real time.

[0113] The above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A defoaming system for a slime thickening tank, characterized in that, It includes a circular chemical storage tank (11) installed on the central support column of a rake thickener. A plurality of first nozzles (22) capable of spraying the chemicals stored inside onto the surface of the thickening pond are arranged on the circular chemical storage tank (11); each of the first nozzles (22) is arranged circumferentially around the central support column in sequence, and the pitching angles of each of the first nozzles (22) are all adjustable in real time to form a variable-diameter annular spraying area on the surface of the thickening pond; it also includes a rectangular chemical storage tank (21) installed on the rake (30) of the rake thickener, and the rectangular chemical storage tank (21) extends along the length direction of the rake (30); a plurality of second nozzles are arranged on both sides of the rectangular chemical storage tank (21), and the pitching angles of each of the second nozzles are all adjustable in real time to form a variable-size rectangular spraying area on the surface of the thickening pond; the variable-diameter annular spraying area and the variable-size rectangular spraying area are staggered with each other to perform full-coverage spraying on the liquid surface.

2. The defoaming system for coal slime thickening tank according to claim 1, characterized in that, A first booster pump is connected and arranged on the circular chemical storage tank (11). The outlet end of the first booster pump is connected and installed with an annular first main pipe, and the first main pipe is sleeved outside the circular chemical storage tank (11). Each of the first nozzles (22) is connected and installed on the first main pipe through a first branch pipe, and a pitching adjustment device for adjusting its pitching angle is installed at each of the first nozzles (22).

3. The coal slime thickening tank defoaming system according to claim 2, wherein, A second booster pump is connected and arranged on the rectangular chemical storage tank (21), and the outlet end of the second booster pump is connected and installed with a second main pipe, and the second main pipe is in a rectangular shape framed outside the rectangular chemical storage tank (21). Each of the second nozzles is connected and installed on the second main pipe in a rectangular arrangement through a second branch pipe, and a pitching adjustment device for adjusting its pitching angle is also installed at each of the second nozzles.

4. The defoaming system for coal slime thickening tank according to claim 3, characterized in that, An ultrasonic transmitting device (40) that can rotate with the frame and emit ultrasonic waves to the liquid surface is also installed on the frame.

5. The defoaming system for coal slime thickening tank according to any one of claims 1-4, characterized in that A real-time monitoring device (50) for the surface tension of coal slime water is also arranged at the surface of the thickening pond.

6. The defoaming system for coal slime thickening tank according to claim 5, wherein The real-time monitoring device (50) for the surface tension of coal slime water includes surface tension sensors, and each of the surface tension sensors is evenly arranged at the liquid surface through a bracket.

7. The coal slime thickening tank defoaming system according to claim 6, wherein The bracket is arranged at the edge of the thickening pond, extends into the thickening pond, and avoids the rotating rake (30).

8. The defoaming system for slime thickening tank according to claim 7, characterized in that, The pressure of the first booster pump is adjustable to adjust the spraying target distance of the first nozzle (22); the pressure of the second booster pump is adjustable to adjust the spraying target distance of the first nozzle (22).

9. The defoaming system for coal slime thickening tank according to claim 8, wherein, The maximum spraying diameter of the variable-diameter annular spraying area is the inner diameter of the thickening pond, and the minimum diameter is the diameter of the circle formed by enclosing the outlets of each nozzle; the length of the variable-size rectangular spraying area is the difference between the inner radius of the thickening pond and the outer radius of the central support column.

10. The defoaming system for coal slime thickening tank according to claim 9, characterized in that, The total real-time spraying flow rate of the active agent corresponding to the circular medicine storage tank (11) and the rectangular medicine storage tank (21) is Q spray (t): The ultrasonic power of the ultrasonic transmitting device (40) is P ultra (t): where, K p represents the proportionality coefficient; K i represents the integral coefficient; γ(τ) represents the historical monitored value of the liquid surface tension in the integral time domain; τ represents the integral variable; dτ represents the differential of the integral variable; K d represents the ratio between the desorption rate constant and the adsorption rate constant; γ set represents the target surface tension; γ(t) represents the real-time monitored value of the liquid surface tension; γ represents the liquid surface tension; β represents the ultrasonic efficiency coefficient; e represents the natural constant; α represents the attenuation coefficient of the ultrasonic wave by the slime water; d represents the ultrasonic wave action depth.

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