A deep cone thickener feeding well flow field characteristic visualized research experimental device

Abstract

The application discloses a kind of deep cone thickener feeding well inner flow field characteristic visualization research experimental device, belong to mine filling tailings thickening technical field.The device includes feeding well system, particle imaging velocity measurement system, particle preparation pumping system and experiment table, feeding well system is installed on experiment table, particle imaging velocity measurement system is directly opposite feeding well system, the laser sheet light source and image sensor camera of particle imaging velocity measurement system are arranged on the corresponding track of experiment table, and particle preparation pumping system is connected with feeding well system.The device will be built intensively with feeding well physical model and laser testing system, the flow field characteristics in feeding well are carried out visualized research using floc tracing technology, the migration image of floc particle under different process conditions can be obtained, the flow field characteristics such as velocity distribution, turbulent kinetic energy distribution in feeding well are analyzed, which lays a foundation for further studying the flocculation and sedimentation behavior of tailings particles in feeding well, so as to promote the development of tailings efficient thickening technology, and help mine solid waste resource utilization.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of tailings filling and thickening in mines, and particularly relates to a visual research experimental device for flow field characteristics in a feeding well of a deep-cone thickener. BACKGROUND

[0002] The paste filling technology can utilize tailings to treat the hazards of goaf and tailings pond caused by mining, and is a new green and low-carbon mining technology. Tailings thickening is the primary link of the paste filling process, and the thickener is a key equipment for realizing solid-liquid separation and deep dewatering of tailings slurry. The feeding well, as a main place where flocculation behavior occurs, is the core of the overall operation performance of the thickener.

[0003] The feeding well fully dissipates the initial feeding kinetic energy, coagulation flocculant molecules and tailings particles through the flow field characteristics in the feeding well, and then forms flocculation with large size and stable structure. It is of practical significance to carry out research on the flow field characteristics in the feeding well, but due to the black-box structural property of the feeding well, the current research means is limited to numerical simulation. The means for obtaining the flow field information in the feeding well through physical testing is still relatively scarce. The existing flow field testing methods mostly rely on external tracer particles, which have good fluid following property, but ignore the settling behavior of flocculation particles in the feeding well. In addition, the existing feeding well model and testing system are not standardized, the testing steps are tedious, and the image distortion and optical distortion problems are serious, which have certain limitations. Therefore, it is extremely important to invent a visual research experimental device for flow field characteristics in the feeding well of a deep-cone thickener. Based on the device, research on the flow field characteristics in the feeding well can realize the leap from a black box to a visual device, avoid the image distortion and optical distortion phenomena existing in the traditional experimental process, and finally provide an experimental basis and theoretical basis for the thickening performance of tailings filling to realize efficient flocculation and deep dewatering. SUMMARY

[0004] The application provides a visual research experimental device for flow field characteristics in the feeding well of a deep-cone thickener to realize the leap from a black box to a visual device.

[0005] To solve the above technical problems, the application provides the following technical scheme.

[0006] The device comprises a feeding well system, a particle imaging velocimetry system, a particle preparation and pumping system and an experimental table. The feeding well system is installed on the experimental table, the particle imaging velocimetry system is opposite to the feeding well system, the laser sheet light source and the image sensor camera of the particle imaging velocimetry system are arranged on the corresponding tracks of the experimental table, and the particle preparation and pumping system is connected to the feeding well system.

[0007] Specifically, the feeding well system includes a square tank, a feeding well, a central shaft, a guide plate, a dispersion disc, a tangent feeding pipe, an overflow pipe and a tee pipe, the particle imaging velocimetry system includes a laser control box, a laser synchronizer, a laser sheet light source, an image sensing camera and an image analysis workstation, the particle preparation pumping system includes a tailing slurry stirring barrel, a flocculating agent solution preparation barrel and a peristaltic pump, and the experimental bench includes a feeding well placement table, a camera track and a sheet light source track.

[0008] A vertical central shaft is arranged in the square tank, the feeding well is hoisted from the top in the square tank, the tangent feeding pipe is arranged at the upper portion of the feeding well, the tangent feeding pipe is 1-2 cm away from the top of the feeding well and is strictly tangent to the inner wall of the feeding well, the annular guide plate is arranged at the position 1 cm below the bottom of the tangent feeding pipe in the feeding well, the width of the guide plate is 10% of the diameter of the feeding well, the conical dispersion disc is fixed at the outlet of the feeding well, the overflow pipe is arranged at the upper portion of the side of the square tank, and the tangent feeding pipe is connected with the tee pipe outside the upper portion of the square tank.

[0009] The feeding well placement table is provided with the camera track and the sheet light source track at the two adjacent sides, respectively.

[0010] The square tank is placed on the feeding well placement table, the laser sheet light source is arranged on the sheet light source track, and the image sensing camera is arranged on the camera track.

[0011] The laser sheet light source is connected with the laser synchronizer through a laser transmission arm, and the laser synchronizer is connected with the laser control box through an optical fiber data line and a cooling pipe.

[0012] The image sensing camera and the laser control box are connected with the image analysis workstation through optical fiber data lines, respectively.

[0013] The tailing slurry stirring barrel and the flocculating agent solution preparation barrel are connected with the tee pipe through the peristaltic silica gel pipes and the peristaltic pump, respectively.

[0014] The camera track is arranged close to the long side of the feeding well placement table, the sheet light source track is arranged close to the short side of the feeding well placement table, and the camera track and the sheet light source track are perpendicular to each other.

[0015] The laser sheet light source and the image sensing camera are freely slidable on the sheet light source track and the camera track, respectively, so that the flow field in different regions of the feeding well system can be visualized and tested.

[0016] The image sensing camera and the laser control box are connected with the image analysis workstation through optical fiber data lines, the image sensing camera and the laser control box are started and stopped by one key of the image analysis workstation, and real-time synchronous testing is realized.

[0017] The whole body of the feeding well system is made of acrylic material, and the square water tank is filled with clean water during testing to reduce optical distortion caused by the curved wall of the feeding well.

[0018] The laser used by the particle preparation pumping system is a double-pulse laser, and the image sensing camera is a CCD camera or an sCMOS camera.

[0019] The prepared tailing slurry and flocculant solution of the particle preparation pumping system enter the tangent feeding pipe through the three-way pipe to form flocs, and the flocs have good fluid following property and light scattering efficiency, so they can be used as tracer particles for visualizing the flow field characteristics in the feeding well.

[0020] The method for using the device comprises the following steps:

[0021] S1: connect the feeding well system, the particle imaging velocity measurement system and the particle preparation pumping system, and place them in the corresponding positions on the experimental table;

[0022] S2: fill the square water tank with clean water, and start the tailing slurry stirring barrel and the flocculant solution preparation barrel, and stir the tailing slurry and the flocculant solution in advance to prepare them for testing;

[0023] S3: according to the selected test area of the feeding well, adjust the positions of the laser sheet light source and the image sensing camera on their respective tracks to ensure that the test area is fully illuminated by the laser sheet light and the particle image is effectively acquired by the camera;

[0024] S4: start the peristaltic pump, first control the pumping of the flocculant solution, and then start the synchronous pumping of the tailing slurry after the flocculant solution is stably pumped into the three-way pipe, and the two are mixed into the feeding well through the tangent feeding pipe to form flocs;

[0025] S5: trigger the laser and camera image acquisition function through the image analysis workbench to capture the transient images of particle migration in the test area of the feeding well;

[0026] S6: after the corresponding number of images is obtained, trigger the laser and camera image acquisition function through the image analysis workbench to stop the test;

[0027] S7: use the image analysis workbench to analyze the particle images collected in S5 in real time, quantitatively analyze the flow field information, and display the overall structure of the flow field in the feeding well.

[0028] Compared with the prior art, the technical scheme of the present application has the following advantages:

[0029] In the above scheme, by using the external square water tank and mutually perpendicular camera track and sheet light source track to constrain the angle of laser and camera view, the image distortion and optical distortion phenomenon existing in the traditional visualization test process can be avoided while realizing the full flow field test of any area in the feeding well. Meanwhile, the floc formed by the particle preparation pumping system can be used as a tracer particle to realize the in-situ real-time test of the behavior subject in the feeding well. Therefore, by using the intensive experimental device, the velocity of all flocs in the test area of the feeding well can be monitored in real time and the transient image of the particle can be captured without disturbing the flow field, the flow field related information in the feeding well can be quantitatively characterized, and the complex flow structure can be revealed in the form of visual image. The foundation is laid for in-depth study of mine tailings flocculation and thickening dehydration and development, and the progress of paste filling technology is promoted. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0031] Figure 1 It is a structural schematic diagram of the deep cone thickener feeding well flow field visualization research experimental device of the present application.

[0032] Figure 2 It is a structural schematic diagram of the feeding well system of the device of the present application.

[0033] Among them: I is the feeding well system, II is the particle imaging velocity measurement system, III is the particle preparation pumping system, IV is the experiment table,

[0034] 1 is a square water tank, 2 is a feeding well, 3 is a center shaft, 4 is a guide plate, 5 is a dispersion disc, 6 is a tangent feeding pipe, 7 is an overflow pipe, 8 is a three-way pipe,

[0035] 9 is a laser control box, 10 is a laser synchronizer, 11 is a laser sheet light source, 12 is an image sensing camera, 13 is an image analysis workbench,

[0036] 14 is a tailings slurry stirring barrel, 15 is a flocculant solution preparation barrel, 16 is a peristaltic pump,

[0037] 17 is a feeding well placing table, 18 is a camera track, 19 is a sheet light source track. DETAILED DESCRIPTION

[0038] In order to make the technical problems, technical solutions and advantages to be solved by the present application more clear, the following will be described in detail in combination with the drawings and specific embodiments.

[0039] The application provides a kind of deep cone thickener feeding well inner flow field characteristic visualization research experimental device.

[0040] As Figure 1 shown, the device includes feeding well system I, particle imaging velocity measurement system II, particle preparation pumping system III and experimental table IV, feeding well system 1 is installed on experimental table IV, particle imaging velocity measurement system II is opposite to feeding well system, laser sheet light source 11 and image sensing camera 12 of particle imaging velocity measurement system II are arranged on the corresponding track of experimental table IV, particle preparation pumping system III is connected with feeding well system I;

[0041] Specifically, feeding well system I includes square water tank 1, feeding well 2, central shaft 3, guide plate 4, dispersion disc 5, tangent feeding pipe 6, overflow pipe 7 and three-way pipe 8, particle imaging velocity measurement system II includes laser control box 9, laser synchronizer 10, laser sheet light source 11, image sensing camera 12 and image analysis workbench 13, particle preparation pumping system III includes tailings slurry stirring barrel 14, flocculating agent solution preparation barrel 15 and peristaltic pump 16, and experimental table IV includes feeding well placement table 17, camera track 18 and sheet light source track 19;

[0042] As Figure 2 shown, the vertical central shaft 3 is arranged in the square water tank 1, the feeding well 2 is hung from the top in the square water tank 1, the tangent feeding pipe 6 is arranged on the upper part of the feeding well 2, the distance between the tangent feeding pipe 6 and the top of the feeding well 2 is 1-2 cm, and the tangent feeding pipe 6 is strictly tangent to the inner wall of the feeding well 2, the annular guide plate 4 is arranged at the position 1 cm below the bottom of the tangent feeding pipe 6 in the feeding well 2, the width of the guide plate 4 is 10% of the diameter of the feeding well 2, the conical dispersion disc 5 is fixed at the outlet of the feeding well 2, the overflow pipe 7 is arranged on the upper part of the side of the square water tank 1, and the tangent feeding pipe 6 is connected with the three-way pipe 8 on the outer side of the upper part of the square water tank;

[0043] The camera track 18 and the sheet light source track 19 are respectively arranged on the different two sides of the feeding well placement table 17;

[0044] The square water tank 1 is placed on the feeding well placement table 17, the laser sheet light source 11 is installed on the sheet light source track 19, and the image sensing camera 12 is installed on the camera track 18;

[0045] The laser sheet light source 11 is connected with the laser synchronizer 10 through the laser transmission arm, and the laser synchronizer 10 is connected with the laser control box 9 through the optical fiber data line and the cooling pipe;

[0046] The image sensing camera 12 and the laser control box 9 are respectively connected with the image analysis workbench 13 through the optical fiber data line;

[0047] The tailings slurry stirring barrel 14 and the flocculating agent solution preparation barrel 15 are respectively connected with the three-way pipe 8 through the peristaltic silica gel pipe and the peristaltic pump 16.

[0048] The method for using the device includes the following steps:

[0049] S1: Connect and place the feedwell system, particle imaging velocimetry system and particle preparation pumping system in the corresponding positions on the experimental bench.

[0050] S2: Fill the square tank with clean water, and start the tailings slurry stirring barrel 14 and the flocculant solution preparation barrel 15 to prepare the tailings slurry and the flocculant solution required for the test in advance.

[0051] S3: According to the selected test area of the feedwell of the experimental scheme, adjust the positions of the laser sheet light source 11 and the image sensing camera 12 on their respective tracks to ensure that the test area is fully illuminated by the laser sheet light and that the particle images are effectively captured by the camera.

[0052] S4: Start the peristaltic pump 16, first control the pumping of the flocculant solution, and after the flocculant solution is stably pumped into the tee pipe 8, start to pump the tailings slurry synchronously, both of which are mixed into the feedwell 2 through the tangent feed pipe 6 to form flocculation.

[0053] S5: Trigger the laser and camera image acquisition function by one key of the image analysis workbench 13 to capture the instantaneous images of particle migration in the test area of the feedwell.

[0054] S6: After the corresponding number of images is obtained, trigger the laser and camera image acquisition function by one key of the image analysis workbench 13 to stop the test.

[0055] S7: Use the image analysis workbench 13 to analyze the particle images collected in S5 in real time, quantitatively analyze the flow field information, and display the overall structure of the flow field of the feedwell.

[0056] The following will be described in conjunction with specific embodiments.

[0057] Example 1

[0058] As Figure 1 and Figure 2The structure of the experimental device for visualizing the flow field characteristics in the feedwell of a deep-cone thickener is shown above, and the dimensions and specifications of the key structures are as follows: the length, width, and height of the square tank 1 are 40 cm, 40 cm, and 50 cm, respectively, the diameter and height of the feedwell 2 are 20 cm and 32 cm, respectively, the height and diameter of the central shaft 3 are 50 cm and 2 cm, respectively, the outer diameter of the guide plate 4 is 20 cm, and the width of the inner and outer edges is 2 cm, the outer diameter of the bottom of the dispersion disc 5 is 24 cm, the inner diameter is 22.8 cm, and the taper angle is 60°, the inner diameters of the tangential feed pipe 6, the overflow pipe 7, and the tee pipe 8 are all 6 mm, and the outer diameters are all 10 mm; the diameter and height of the tailings slurry stirring barrel 14 are 30 cm and 30 cm, respectively, the diameter and height of the flocculant solution preparation barrel 15 are 20 cm and 20 cm, respectively; the particle imaging velocimetry system II uses a double-pulse Nd:YAG laser, and the image sensing camera 12 is an Image sCMOS camera.

[0059] In the application process, first, the systems are connected to each other and strictly placed in the corresponding positions of the experimental table IV, and the tailings slurry and the flocculant solution required for the experiment are prepared in the tailings slurry stirring barrel 14 and the flocculant solution preparation barrel 15; the square tank 1 is filled with water, and the positions of the laser sheet light source 11 and the image sensing camera 12 on their respective tracks are adjusted, and the to-be-measured area of the feedwell 2 is accurately focused; the peristaltic pump 16 is turned on, and first, the pumping flow rate is controlled to be 50-100 ml / min to pump the flocculant solution for 20 s, and then the pumping flow rate is controlled to be 2000-3400 ml / min to pump the tailings slurry, and the flocculant solution and the tailings slurry are mixed in the tangential feed pipe 6 through the tee pipe 8 and then enter the feedwell 2; after the pumping is stable, the laser and camera image acquisition functions are started by one-key triggering of the image analysis workbench 13 for real-time measurement; after 50-100 particle images are captured, the test is closed by one-key triggering, and the image analysis workbench 13 is used for quantitative analysis and image visualization of the flow field.

[0060] The above describes preferred embodiments of the present application, and it should be noted that for those skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should also be considered within the protection scope of the present application.

Claims

1. A deep-cone thickener feedwell internal flow field characteristic visualization research experimental device, characterized in that, The device comprises a feeding well system, a particle imaging velocity measurement system, a particle preparation pumping system and an experimental table, the feeding well system is installed on the experimental table, the particle imaging velocity measurement system is opposite to the feeding well system, a laser sheet light source and an image sensing camera of the particle imaging velocity measurement system are arranged on corresponding tracks of the experimental table, and the particle preparation pumping system is connected with the feeding well system; Specifically, the feeding well system comprises a square tank, a feeding well, a central shaft, a guide plate, a dispersion disc, a tangent feeding pipe, an overflow pipe and a tee pipe, the particle imaging velocity measurement system comprises a laser control box, a laser synchronizer, a laser sheet light source, an image sensing camera and an image analysis workbench, the particle preparation pumping system comprises a tailings slurry stirring barrel, a flocculating agent solution preparation barrel and a peristaltic pump, and the experimental table comprises a feeding well placement table, a camera track and a sheet light source track. A vertical central shaft is arranged in the square tank, the feeding well is hung from the top of the square tank, a tangent feeding pipe is arranged on the upper part of the feeding well, the tangent feeding pipe is 1-2 cm away from the top of the feeding well and is strictly tangent to the inner wall of the feeding well, an annular guide plate is arranged at a position 1 cm below the bottom of the tangent feeding pipe in the feeding well, the width of the guide plate is 10% of the diameter of the feeding well, a conical dispersion disc is fixed at the outlet of the feeding well, an overflow pipe is arranged on the upper part of the side of the square tank, and the tangent feeding pipe is connected with the tee pipe outside the upper part of the square tank. The feeding well placement table is provided with a camera track and a sheet light source track on two adjacent sides. The square tank is placed on the feeding well placement table, the laser sheet light source is arranged on the sheet light source track, and the image sensing camera is arranged on the camera track. The laser sheet light source is connected with the laser synchronizer through a laser transmission arm, and the laser synchronizer is connected with the laser control box through an optical fiber data line and a cooling pipe. The image sensing camera and the laser control box are connected with the image analysis workbench through optical fiber data lines. The tailings slurry stirring barrel and the flocculating agent solution preparation barrel are connected with the tee pipe through peristaltic silica gel pipes and the peristaltic pump. The camera track is arranged close to the long side of the feeding well placement table, the sheet light source track is arranged close to the short side of the feeding well placement table, and the camera track and the sheet light source track are perpendicular to each other. The feeding well system is made of acrylic material, the square tank is filled with water during testing, and optical distortion caused by the curved wall of the feeding well is reduced.

2. The deep-cone thickener feedwell internal flow field visualization research test device of claim 1, wherein, The laser sheet light source and the image sensing camera are freely slidable on the sheet light source track and the camera track respectively.

3. The deep-cone thickener feedwell internal flow field visualization research test apparatus of claim 1, wherein, The image sensing camera and the laser control box are connected with the image analysis workbench through optical fiber data lines, the image analysis workbench is used to trigger the start and stop of the laser and the image sensing camera image acquisition function at one key, and real-time synchronous testing is realized.

4. The deep-cone thickener feedwell internal flow field visualization research test apparatus of claim 1, wherein, The laser used by the particle imaging velocity measurement system is a double-pulse laser, and the image sensing camera is a CCD camera or an sCMOS camera.

5. The deep-cone thickener feedwell internal flow field visualization research test apparatus of claim 1, wherein, The prepared tailings slurry and flocculating agent solution of the particle preparation pumping system are mixed into the tangent feeding pipe through the tee pipe to form flocs, and the flocs are used as tracer particles for the visualization test of the flow field characteristics in the feeding well.

6. The deep-cone thickener feedwell internal flow field visualization study test rig of claim 1, wherein, The use method of the device comprises the following steps: S1: connect and place the feeding well system, the particle imaging velocity measurement system and the particle preparation pumping system at corresponding positions of the experimental table. S2: Fill the square tank with clean water, and start the tailings slurry stirring barrel and the flocculant solution preparation barrel to prepare the required tailings slurry and flocculant solution in advance; S3: According to the selected test area of the feeding well, adjust the position of the laser sheet light source and the image sensor camera on their respective tracks to ensure that the test area is fully illuminated by the laser sheet light and the particle image is effectively captured by the camera; S4: Start the peristaltic pump, first control the pumping of the flocculant solution, after the flocculant solution is stably pumped into the tee pipe, start to pump the tailings slurry synchronously, both are mixed into the feeding well through the tangent feeding pipe to form flocculation; S5: Trigger the laser and camera image acquisition function through the image analysis workbench to capture the instantaneous image of particle migration in the test area of the feeding well; S6: After the corresponding number of images is obtained, trigger the laser and camera image acquisition function through the image analysis workbench to stop the test; S7: Use the image analysis workbench to analyze the particle image collected in S5 in real time, quantitatively analyze the flow field information, and display the overall structure of the flow field of the feeding well.

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