Composite stirring device of crystallizer

Abstract

The utility model belongs to the technical field of steel continuous casting tests, and provides a crystallizer composite stirring device which is characterized in that a crystallizer is of a hollow cylindrical structure and used for containing experimental water, a submersed nozzle is arranged on the upper side in the crystallizer, a water inlet pipe is inserted above the submersed nozzle, and a water inlet control valve is arranged on the water inlet pipe; the nozzle rotational flow stirrer is arranged in the submersed nozzle and connected with the stirrer transmission motor, the crystallizer stirring paddle is arranged on the lower side in the crystallizer and connected with the stirring paddle transmission motor, and the water outlet pipe is connected with the crystallizer through a water outlet formed in the lower portion of the side wall of the crystallizer. A water outlet control valve is arranged on the water outlet pipe, and the stirrer transmission motor and the stirring paddle transmission motor are both connected with the control terminal. The device can visually display the change rule of the flow field in the crystallizer under the action of composite stirring, and the test cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of steel continuous casting experiments and specifically discloses a crystallizer composite stirring device. Background Art

[0002] In the process of continuous casting of round billets, the flow behavior of molten steel in the crystallizer directly affects the quality of the continuous casting billet. Steel companies use the crystallizer electromagnetic stirring technology to make the molten steel in the crystallizer rotate and flow, thereby optimizing the flow field in the crystallizer. However, when the intensity of the crystallizer electromagnetic stirring is too high, it will produce too strong secondary flow in the crystallizer, which is not conducive to the uniform distribution of solute elements in the continuous casting billet, thereby deteriorating the performance of steel. Based on the above problems, domestic and foreign researchers have proposed the water inlet swirl technology, which can make the molten steel in the crystallizer rotate to replace the crystallizer electromagnetic stirring.

[0003] At present, the nozzle swirl continuous casting technology can be realized by a variety of methods. The Chinese patent application with publication number CN114939651A discloses a continuous casting tundish device and process method with swirl effect, the Chinese patent with authorization number CN111482588B discloses an immersion nozzle swirl generator, tundish and application, the Chinese patent with authorization number CN105965003B discloses a nozzle swirl generator and a nozzle swirl continuous casting method, the Chinese patent with authorization number CN117718467B discloses an electromagnetic swirl enhanced immersion nozzle, and the Chinese patent with authorization number CN106166609B discloses an immersion nozzle electromagnetic swirl device. These technologies are to adjust the structure of the immersion nozzle or tundish, or use electromagnetic metallurgical technology to keep the molten steel in a rotating flow in the crystallizer after leaving the immersion nozzle. Related research has found that when the water inlet swirl technology is used in conjunction with the original crystallizer electromagnetic stirring, that is, when the molten steel in the crystallizer is compositely stirred, the severity of the macro-segregation defects of the continuous casting billet can be further reduced.

[0004] In the prior art, the research work on the effect of compound stirring on the flow field of the continuous casting round billet crystallizer is limited to industrial tests and numerical simulation studies. When industrial tests are used as research methods, the changing law of the flow trajectory of the molten steel in the crystallizer under the action of compound stirring cannot be intuitively displayed, and the results of numerical simulation studies need to be verified by physical simulation. Therefore, the water model physical simulation research method can be used to reduce the continuous casting site equipment according to a certain proportion, and intuitively display the effect of compound stirring on the flow field of the continuous casting round billet crystallizer. However, since the electromagnetic force cannot act on the fluid with water as the medium, the water model test device cannot use electromagnetic stirring technology to rotate the water, and when the water swirl technology is realized by adjusting the tundish or the immersed water nozzle structure, the water nozzle swirl intensity cannot be freely adjusted according to the test requirements. When examining different water nozzle swirl intensities as water model test conditions, it is necessary to manufacture multiple sets of swirl generator components, which will increase the manufacturing time and processing cost of the test device. In addition, there is currently no design of a water model test device that realizes the coupling effect of water nozzle swirl and crystallizer electromagnetic stirring. In view of the above-mentioned problems, it is very necessary to study and design a new type of crystallizer composite stirring device to overcome the problems existing in the research work on the effect of existing composite stirring on the flow field of continuous casting round billet crystallizer. Utility Model Content

[0005] The utility model proposes a crystallizer composite stirring device to solve the problems that the existing research work on the effect of composite stirring on the flow field in the continuous casting round billet crystallizer is limited to industrial experiments and numerical simulation research, but the industrial experiment cannot intuitively show the flow field change law, the numerical simulation research can only be verified through physical parameter simulation, and the existing device cost is relatively high.

[0006] The utility model provides a crystallizer composite stirring device, comprising

[0007] The crystallizer is a hollow cylindrical structure used to hold experimental water;

[0008] The submerged water inlet is an annular structure and is arranged on the upper side of the crystallizer;

[0009] A water inlet pipe is arranged above the immersion water inlet, and a water inlet control valve and a water inlet flow meter are provided on the water inlet pipe;

[0010] A nozzle swirl agitator, which is arranged inside the immersion nozzle and can be disassembled;

[0011] A stirrer drive motor, connected to the water inlet swirl stirrer, used to drive the water inlet swirl stirrer to rotate;

[0012] A crystallizer stirring paddle is arranged at the lower side of the crystallizer;

[0013] A stirring paddle drive motor, connected to the crystallizer stirring paddle, and used to drive the crystallizer stirring paddle to rotate;

[0014] A water outlet pipe is connected to the crystallizer through a water outlet provided below the side wall of the crystallizer, and a water outlet control valve and a water outlet flow meter are provided on the water outlet pipe;

[0015] The control terminal is respectively connected with the water inlet flow meter, the water inlet control valve, the water outlet flow meter, the water outlet control valve, the agitator drive motor and the agitator paddle drive motor.

[0016] According to a crystallizer composite stirring device in some embodiments of the present application, a flow stabilizing plate is provided below the crystallizer stirring paddle, and the flow stabilizing plate is horizontally arranged inside the crystallizer.

[0017] According to a crystallizer composite stirring device in some embodiments of the present application, the water inlet flow meter, water inlet control valve, water outlet flow meter, water outlet control valve, agitator drive motor and stirring paddle drive motor are all connected to the control terminal via a data transmission line.

[0018] According to a crystallizer composite stirring device in some embodiments of the present application, the water inlet swirl agitator is a propeller-shaped structure, the water inlet swirl agitator is connected to the agitator drive motor through an agitator drive rod, and the rotation speed of the water inlet swirl agitator is 0~50 r / min.

[0019] According to a crystallizer composite stirring device in some embodiments of the present application, the crystallizer stirring paddle is connected to the stirring paddle drive motor through a stirring paddle drive rod, and the rotation speed of the crystallizer stirring paddle is 0~80 r / min.

[0020] According to a crystallizer composite stirring device in some embodiments of the present application, the crystallizer stirring paddle includes a plurality of L-shaped stirring paddles, each of the L-shaped stirring paddles includes a horizontal portion and a vertical portion connected to each other, the horizontal portion end of each L-shaped stirring paddle is connected to the stirring paddle transmission rod, and the distance between the vertical portion of each L-shaped stirring paddle and the inner wall of the crystallizer is 10 mm.

[0021] According to a crystallizer composite stirring device in some embodiments of the present application, a base is provided at the lower end of the crystallizer, and the cross-section of the base is square.

[0022] According to a crystallizer composite stirring device in some embodiments of the present application, the base includes a stainless steel base, and the crystallizer includes a plexiglass crystallizer.

[0023] According to some embodiments of the present application, a crystallizer composite stirring device also includes a collection system, which includes a camera device, a speed meter and a host computer. The camera device is arranged outside the crystallizer, and is used to capture the trajectory image of water inside the crystallizer and the flow field state of water. The speed meter is arranged outside the crystallizer, and is used to measure the flow velocity of water at the liquid surface position. The camera device and the speed meter are both connected to the host computer, and the host computer is used to receive and process the data of the water trajectory image, the water flow field state, and the water flow velocity.

[0024] According to some embodiments of the present application, a crystallizer composite stirring device further includes a display component, which is connected to the host computer and is used to display a trajectory image of water inside the crystallizer and a flow rate of water through images.

[0025] The utility model proposes a crystallizer composite stirring device, which installs a water inlet swirl stirrer inside an immersed water inlet, and the stirrer transmission motor drives the water inlet swirl stirrer to rotate, so that the fluid in the immersed water inlet rotates; a crystallizer stirring paddle is installed at the lower part of the crystallizer, and the stirring paddle transmission motor drives the crystallizer stirring paddle to rotate, so that the fluid in the crystallizer rotates; the rotation speeds of the water inlet swirl stirrer and the crystallizer stirring paddle are changed by a control terminal, so that the rotation speeds of the fluid in the immersed water inlet and the rotation speed of the fluid in the crystallizer can be controlled; the utility model can realize the investigation of the flow field characteristics of the continuous casting round billet crystallizer under the action of the water inlet swirl stirrer, the crystallizer stirring paddle or the coupling of the water inlet swirl stirrer and the crystallizer stirring paddle in the same test device; the test device can not only intuitively show the flow field change law, but also reduce the processing time and processing cost of equipment components when studying different test conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a front view schematic diagram of the composite stirring device for a crystallizer of the utility model;

[0027] Figure 2 It is a top view schematic diagram of the composite stirring device for the crystallizer of the utility model;

[0028] Figure 3 This is a top view schematic diagram of the crystallizer stirring paddle structure of the utility model;

[0029] Figure 4 This is a velocity distribution diagram in the radial direction at the liquid surface when a cyclone agitator with only a water inlet is used in Example 2 of the utility model;

[0030] Figure 5 This is a velocity distribution diagram in the radial direction at the liquid surface when the water inlet cyclone agitator and the crystallizer stirring paddle are coupled in Example 3 of the utility model;

[0031] Figure 6 This is a schematic front view of the test device when only a crystallizer stirring paddle is used in Example 4 of the utility model;

[0032] Figure 7 This is a velocity distribution diagram in the radial direction at the liquid surface when only a crystallizer stirring paddle is used in Example 4 of the utility model.

[0033] In the figure: 1. crystallizer, 2. immersed water inlet, 3. base, 4. flow stabilizing plate, 5. water inlet pipe, 6. water inlet flow meter, 7. water inlet control valve, 8. water outlet, 9. water outlet pipe, 10. water outlet flow meter, 11. water outlet control valve, 12. water inlet swirl agitator, 13. agitator drive rod, 14. agitator drive motor, 15. crystallizer stirring paddle, 16. stirring paddle drive rod, 17. stirring paddle drive motor, 18. data transmission line, 19. control terminal. DETAILED DESCRIPTION

[0034] The following is a further detailed description of the implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0035] In the description of the present utility model, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, in the description of the present utility model, unless otherwise specified, the meaning of "multiple" is two or more.

[0036] Embodiment 1: This embodiment provides a crystallizer composite stirring device, such as Figure 1 and Figure 2As shown, it includes a crystallizer 1, an immersion nozzle 2, a water inlet pipe 5, a nozzle swirl agitator 12, a stirrer drive motor 14, a crystallizer stirring paddle 15, a stirring paddle drive motor 17, a water outlet pipe 9 and a control terminal 19, the immersion nozzle 2 is arranged on the upper side of the interior of the crystallizer 1, the water inlet pipe 5 is inserted above the immersion nozzle 2, the water inlet pipe 5 is provided with a water inlet control valve 7 and a water inlet flowmeter 6, the nozzle swirl agitator 12 is arranged inside the immersion nozzle 2, the nozzle swirl agitator 12 and the stirrer drive motor 14 are connected to the nozzle swirl agitator 12. The crystallizer stirring paddle 15 is connected to the stirring paddle drive motor 17, the water outlet pipe 9 is connected to the crystallizer 1 through the water outlet 8 arranged below the side wall of the crystallizer 1, and the water outlet control valve 11 and the water outlet flow meter 10 are arranged on the water outlet pipe 9, and the water inlet flow meter 6, the water inlet control valve 7, the water outlet flow meter 10, the water outlet control valve 11, the stirring drive motor 14 and the stirring paddle drive motor 17 are all connected to the control terminal 19. When in use, water flows through the immersion water inlet 2 through the water inlet pipe 5, enters the crystallizer 1, and then flows out from the water outlet pipe 9 connected to the water outlet 8 at the lower part of the crystallizer 1.

[0037] It should be noted that, as a preferred embodiment of the present invention, a flow stabilizer 4 may be provided below the crystallizer stirring paddle 15, and the flow stabilizer 4 is horizontally arranged inside the crystallizer 1, and the flow stabilizer 4 is used to stabilize the flow of fluid in the crystallizer 1. The water inlet flowmeter 6 is arranged between the water inlet control valve 7 and the immersion water inlet 2, and the water inlet flowmeter 6 provided on the water inlet pipe 5 can measure the water flow in the water inlet pipe 5. When in use, according to the test needs, the control terminal 19 adjusts the water inlet control valve 7 according to the water flow collected by the water inlet flowmeter 6 to change the water flow in the water inlet pipe 5; the water outlet flowmeter 10 is arranged between the water outlet 8 and the water outlet control valve 11, and the water outlet flowmeter 10 provided on the water outlet pipe 9 can measure the water flow in the water outlet pipe 9. When in use, according to the test needs, the control terminal 19 adjusts the water outlet control valve 11 according to the water flow collected by the water outlet flowmeter 10 to change the water flow in the water outlet pipe 9. More preferably, the water inlet flow meter 6 , the water inlet control valve 7 , the water outlet flow meter 10 , the water outlet control valve 11 , the agitator drive motor 14 and the agitator paddle drive motor 17 are all connected to the control terminal 19 via a data transmission line 18 .

[0038] It should be noted that, as a preferred embodiment of the present invention, the water inlet swirl agitator 12 can be detachably installed inside the immersion water inlet 2. The water inlet swirl agitator 12 can be a propeller-shaped structure. The water inlet swirl agitator 12 can stir the water in the immersion water inlet 2, so that the water rotates circumferentially in the immersion water inlet 2. The water inlet swirl agitator 12 can be connected to the agitator drive motor 14 through the agitator drive rod 13. The agitator drive rod 13 drives the water inlet swirl agitator 12 to rotate under the action of the agitator drive motor 14. The rotation speed of the water inlet swirl agitator 12 can be 0~50 r / min. The crystallizer stirring paddle 15 is connected to the stirring paddle drive motor 17 through the stirring paddle drive rod 16. Figure 3 As shown, the crystallizer stirring paddle 15 includes a plurality of L-shaped stirring paddles, each L-shaped stirring paddle includes a horizontal portion and a vertical portion connected to each other, the horizontal end of each L-shaped stirring paddle is connected to the stirring paddle transmission rod 16, and the distance between the vertical portion of each L-shaped stirring paddle and the inner wall of the crystallizer 1 is 10 mm, ensuring that the crystallizer stirring paddle 15 has no contact with the inner wall of the crystallizer 1, and when the crystallizer stirring paddle 15 rotates, the maximum tangential velocity of the water rotating in the crystallizer 1 is near the inner wall of the crystallizer 1, and the stirring paddle transmission rod 16 drives the crystallizer stirring paddle 15 to rotate under the action of the stirring paddle transmission motor 17, and the rotation speed of the crystallizer stirring paddle 15 is 0~80 r / min. When using this experimental device, according to the requirements of the water model test, the control terminal 19 can be used to adjust the rotation speed of the water inlet swirl stirrer 12 in the immersed water inlet 2, thereby changing the swirl intensity when the water leaves the immersed water inlet 2; the control terminal can be used to adjust the rotation speed of the crystallizer stirring paddle 15, thereby changing the rotation speed of the water under the action of the crystallizer stirring paddle 15.

[0039] It should be noted that, as a preferred embodiment of the present invention, a base 3 may be further provided at the lower end of the crystallizer 1, and the base 3 is used to support the crystallizer 1. More preferably, the cross section of the base 3 may be square, the bottom is hollow, and the material may be stainless steel, the water inlet pipe 5 and the water outlet pipe 9 may use PVC water pipes, the immersion nozzle 2 and the crystallizer 1 may be hollow cylindrical structures, and the material of the immersion nozzle 2 and the crystallizer 1 may be organic glass, and the use of organic glass may make it easier to observe the flow characteristics of water in the crystallizer 1 and the immersion nozzle 2.

[0040] It should be noted that, as a preferred embodiment of the present invention, a crystallizer composite stirring device of the present invention further includes a collection system, which includes a camera, a velocimeter and a host computer. The camera is arranged outside the crystallizer 1, and is used to capture the trajectory image of the water inside the crystallizer 1 and the flow field state of the water. The velocimeter is arranged outside the crystallizer 1, and is used to measure the flow velocity of the water at the liquid level. The camera and the velocimeter are both connected to the host computer, and the host computer is used to receive and process the data of the trajectory image of the water, the flow field state of the water, and the flow velocity of the water. It also includes a display component, which is connected to the host computer and is used to display the trajectory image of the water inside the crystallizer 1 and the flow velocity of the water through an image.

[0041] This embodiment also provides a test method for a crystallizer composite stirring device, using the crystallizer composite stirring device, comprising the following steps:

[0042] S1. Adjust the opening of the water inlet control valve 7 and the opening of the water outlet control valve 11 so that water flows into the immersion water inlet 2 through the water inlet pipe 5, then flows into the crystallizer 1 through the immersion water inlet 2, and finally flows out through the water outlet pipe 9, and ensure that the liquid level of water in the immersion water inlet 2 and the crystallizer 1 always meets the required test conditions;

[0043] S2. According to different test requirements, choose one of the following to test:

[0044] a. If the test requirement is to examine the effect of the rotation speed of the water in the crystallizer 1 on the flow field of the water in the crystallizer 1, the rotation speed of the crystallizer stirring paddle 15 is changed by the control terminal 19 to obtain different rotation speeds of the water in the crystallizer 1;

[0045] b. If the test requirement is to examine the effect of the swirling flow intensity of the immersion nozzle 2 on the flow field of the water in the crystallizer 1, the rotation speed of the nozzle swirl stirrer 12 is changed by controlling the terminal 19 to obtain different nozzle swirl intensities;

[0046] c. If the test requirement is to examine the effect of the coupling effect of the composite stirring on the flow field of the water in the crystallizer 1, the rotation speed of the crystallizer stirring paddle 15 and the water inlet swirl stirrer 12 is changed by the control terminal 19 to obtain different rotation speeds of the water in the crystallizer 1 and different water inlet swirl intensities;

[0047] S3. According to the test content of the water model test, the flow characteristics of the water in the crystallizer 1 are obtained by a camera device to obtain the effects of different test conditions on the flow field of the water in the crystallizer 1 .

[0048] It should be noted that, as a preference of this embodiment, the water inlet swirl agitator 12 and the crystallizer stirring paddle 15 can be used separately or in coupling according to different test requirements. When the flow field in the crystallizer 1 is examined under the action of the crystallizer stirring paddle 15 alone, the water inlet swirl agitator 12 and the agitator transmission rod 13 can be moved to the outside of the immersion water inlet 2, and the crystallizer stirring paddle 15 is adjusted to the rotation speed required by the test. When the flow field in the crystallizer 1 is examined under the action of the water inlet swirl agitator 12 alone, the water inlet swirl agitator 12 is inserted into the inside of the immersion water inlet 2, the crystallizer stirring paddle 15 does not rotate, and the water inlet swirl agitator 12 is adjusted to the rotation speed required by the test. When the coupling effect of the water inlet swirl agitator 12 and the crystallizer stirring paddle 15 is examined, the water inlet swirl agitator 12 is inserted into the inside of the immersion water inlet 2, and the water inlet swirl agitator 12 and the crystallizer stirring paddle 15 are adjusted to the rotation speed required by the test.

[0049] It should be noted that, as a preferred embodiment of the present invention, in step S3, a tracer is dripped into the crystallizer 1, and the situation in the crystallizer 1 after the tracer is dripped is photographed by a camera device to obtain a trajectory image of water and a flow field state of water in the crystallizer 1, and the fluid flow velocity at the liquid surface position is measured by a velocimeter. More preferably, the tracer can be ink.

[0050] The utility model provides a crystallizer composite stirring device, which can freely adjust the rotation speed of the fluid in the submerged water inlet 2 and the water in the crystallizer 1 in the water model test, and does not need to manufacture multiple sets of water inlet swirl generators, so as to reduce the processing time and processing cost of the water model test device. The utility model provides a crystallizer composite stirring device test method, which can examine the single water inlet swirl technology or the crystallizer electromagnetic stirring technology according to the requirements of the test content, as well as the flow field characteristics in the crystallizer 1 when the two technologies are coupled.

[0051] Example 2: This example provides a test method for a crystallizer composite stirring device. In this example, the test requirement is to examine the effect of a single-water inlet cyclone stirrer 12 on the flow field in the crystallizer 1.

[0052] S1. Adjust the opening of the water inlet control valve 7 and the opening of the water outlet control valve 11 so that water flows into the immersion water inlet 2 through the water inlet pipe 5, then flows into the crystallizer 1 through the immersion water inlet 2, and finally flows out through the water outlet pipe 9, and ensure that the liquid level of water in the immersion water inlet 2 and the crystallizer 1 always meets the required test conditions;

[0053] S2. By changing the rotation speed of the nozzle swirl agitator 12 through the control terminal 19, the rotation speed of the nozzle swirl agitator 12 is adjusted to the test condition parameters;

[0054] S3. According to the test content of the water model test, the flow characteristics of water in the crystallizer 1 are obtained by a camera device to obtain the effect of different test conditions on the flow field of water in the crystallizer 1;

[0055] In this embodiment, ink is used as a tracer to obtain the trajectory image of water flowing in the crystallizer 1 for 1 second to 4 seconds. When the rotation speed of the water inlet swirl stirrer 12 is 30 r / min and the rotation speed of the crystallizer stirring paddle 15 is 0 r / min, the flow trajectory of the water in the crystallizer 1 is as follows: after the water leaves the immersion water inlet 2, the flow trajectory is symmetrically distributed in the crystallizer 1. The fluid flow velocity at the liquid surface position is measured using a tachometer. Figure 4 The velocity distribution of water flow in the radial direction is shown in FIG. 1 . The velocity increases gradually from the inner wall of the crystallizer 1 to the center of the crystallizer 1 .

[0056] Example 3: This example provides a test method for a crystallizer composite stirring device. In this example, the test requirement is to examine the influence of the coupling action of the water inlet swirl stirrer 12 and the crystallizer stirring paddle 15 on the flow field inside the crystallizer 1.

[0057] S1. Adjust the opening of the water inlet control valve 7 and the opening of the water outlet control valve 11 so that water flows into the immersion water inlet 2 through the water inlet pipe 5, then flows into the crystallizer 1 through the immersion water inlet 2, and finally flows out through the water outlet pipe 9, and ensure that the liquid level of water in the immersion water inlet 2 and the crystallizer 1 always meets the required test conditions;

[0058] S2. By changing the rotation speed of the crystallizer stirring paddle 15 and the nozzle swirl stirrer 12 through the control terminal 19, the rotation speed of the crystallizer stirring paddle 15 and the nozzle swirl stirrer 12 is adjusted to the test condition parameters;

[0059] S3. According to the test content of the water model test, the flow characteristics of water in the crystallizer 1 are obtained by a camera device to obtain the effect of different test conditions on the flow field of water in the crystallizer 1;

[0060] In this embodiment, ink is used as a tracer to obtain the trajectory image of water flowing in the crystallizer 1 for 1 second to 4 seconds. When the rotation speed of the water inlet swirl stirrer 12 is 30 r / min and the rotation speed of the crystallizer stirring paddle 15 is 70 r / min, the flow trajectory of the water in the crystallizer 1 is: after the water leaves the immersion water inlet 2, the flow trajectory is basically symmetrically distributed in the left and right directions in the crystallizer 1. The fluid flow velocity at the liquid surface position is measured using a tachometer. Figure 5 The velocity distribution of the fluid flow in the radial direction is shown in FIG. 1 . The velocity gradually decreases from the inner wall surface of the crystallizer 1 to the center of the crystallizer 1 .

[0061] Example 4: This example provides a test method for a crystallizer composite stirring device. In this example, the test requirement is to examine the effect of a single crystallizer stirring paddle 15 on the flow field in the crystallizer 1.

[0062] S1. Adjust the opening of the water inlet control valve 7 and the opening of the water outlet control valve 11 so that water flows into the immersion water inlet 2 through the water inlet pipe 5, then flows into the crystallizer 1 through the immersion water inlet 2, and finally flows out through the water outlet pipe 9, and ensure that the liquid level of water in the immersion water inlet 2 and the crystallizer 1 always meets the required test conditions;

[0063] S2. Figure 6 As shown, the water inlet cyclone stirrer 12 and the stirrer transmission rod 13 are moved out of the immersion water inlet 2, and the rotation speed of the crystallizer stirring paddle 15 is changed by the control terminal 19, and the rotation speed of the crystallizer stirring paddle 15 is adjusted to the water model test condition parameter;

[0064] S3. According to the test content of the water model test, the flow characteristics of water in the crystallizer 1 are obtained by a camera device to obtain the effect of different test conditions on the flow field of water in the crystallizer 1;

[0065] In this embodiment, ink is used as a tracer to obtain the trajectory image of water flowing in the crystallizer 1 from 1 second to 4 seconds. When the speed of the water inlet swirl stirrer 12 is 0 r / min and the speed of the crystallizer stirring paddle 15 is 70 r / min, the flow trajectory of the water in the crystallizer 1 is as follows: after the water leaves the immersion water inlet 2, the flow trajectory is unevenly distributed in the left and right directions in the crystallizer 1, and a biased flow occurs. The fluid flow velocity at the liquid surface position is measured using a tachometer. Figure 7 The velocity distribution of the fluid flow in the radial direction is shown in FIG. 1 . The velocity gradually decreases from the inner wall surface of the crystallizer 1 to the center of the crystallizer 1 .

[0066] The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

Claims

1. A crystallizer composite stirring device, characterized in that: include The crystallizer (1) is a hollow cylindrical structure and is used to hold experimental water; The submerged water inlet (2) is an annular structure and is arranged on the upper side of the interior of the crystallizer (1); A water inlet pipe (5) is arranged above the immersion water inlet (2), and a water inlet control valve (7) and a water inlet flow meter (6) are provided on the water inlet pipe (5); A nozzle swirl stirrer (12), which is arranged inside the immersion nozzle (2) and is detachable; a stirrer drive motor (14), connected to the water inlet swirl stirrer (12), and used to drive the water inlet swirl stirrer (12) to rotate; A crystallizer stirring paddle (15) is arranged at the lower side of the interior of the crystallizer (1); A stirring paddle drive motor (17), connected to the crystallizer stirring paddle (15), and used to drive the crystallizer stirring paddle (15) to rotate; A water outlet pipe (9) is connected to the crystallizer (1) via a water outlet (8) provided below the side wall of the crystallizer (1), and a water outlet control valve (11) and a water outlet flow meter (10) are provided on the water outlet pipe (9); The control terminal (19) is respectively connected to the water inlet flow meter (6), the water inlet control valve (7), the water outlet flow meter (10), the water outlet control valve (11), the agitator drive motor (14) and the agitator paddle drive motor (17).

2. A crystallizer composite stirring device according to claim 1, characterized in that: A flow stabilizing plate (4) is provided below the crystallizer stirring paddle (15), and the flow stabilizing plate (4) is horizontally arranged inside the crystallizer (1).

3. A crystallizer composite stirring device according to claim 1, characterized in that: The water inlet flow meter (6), the water inlet control valve (7), the water outlet flow meter (10), the water outlet control valve (11), the agitator drive motor (14) and the agitator propeller drive motor (17) are all connected to the control terminal (19) via a data transmission line (18).

4. A crystallizer composite stirring device according to claim 1, characterized in that: The water inlet swirl agitator (12) is a propeller-shaped structure, the water inlet swirl agitator (12) is connected to the agitator drive motor (14) via an agitator drive rod (13), and the rotation speed of the water inlet swirl agitator (12) is 0-50 r / min.

5. A crystallizer composite stirring device according to claim 1, characterized in that: The crystallizer stirring paddle (15) is connected to the stirring paddle drive motor (17) via a stirring paddle drive rod (16), and the rotation speed of the crystallizer stirring paddle (15) is 0-80 r / min.

6. A crystallizer composite stirring device according to claim 5, characterized in that: The crystallizer stirring paddle (15) includes a plurality of L-shaped stirring paddles, each of which includes a horizontal portion and a vertical portion that are connected to each other, the horizontal portion end of each L-shaped stirring paddle is connected to the stirring paddle transmission rod (16), and the distance between the vertical portion of each L-shaped stirring paddle and the inner wall of the crystallizer (1) is 10 mm.

7. A crystallizer composite stirring device according to claim 1, characterized in that: A base (3) is provided at the lower end of the crystallizer (1), and the cross section of the base (3) is square.

8. A crystallizer composite stirring device according to claim 7, characterized in that: The base (3) comprises a stainless steel base, and the crystallizer (1) comprises a plexiglass crystallizer.

9. A crystallizer composite stirring device according to claim 1, characterized in that: The invention also comprises a collection system, the collection system comprising a camera device, a speed meter and a host computer, the camera device being arranged outside the crystallizer (1) and being used to capture the trajectory image of water inside the crystallizer (1) and the flow field state of water, the speed meter being arranged outside the crystallizer (1) and being used to measure the flow velocity of water at the liquid surface position, the camera device and the speed meter being connected to the host computer, and the host computer being used to receive and process the data of the trajectory image of water, the flow field state of water and the flow velocity of water.

10. A crystallizer composite stirring device according to claim 9, characterized in that: It also comprises a display component, which is connected to the host computer and is used to display the trajectory image of the water inside the crystallizer (1) and the flow speed of the water through images.

Images