High-precision temperature-sensing centering device for split continuous casting submerged nozzle and its application method

Abstract

The present invention discloses a high-precision temperature-sensing centering device for split continuous casting submerged nozzles and its application method. The centering device includes a hollow ring composed of several cavity segments filled with liquid. The liquid in each cavity segment is correspondingly connected to a temperature monitoring mechanism through a conduit, and the high and low order of the liquid temperature in the corresponding cavity segment is obtained according to the readings of each temperature monitoring mechanism. The application method uses the above centering device and includes sleeving the hollow ring on an external submerged nozzle; obtaining the high and low order of the liquid temperature in the corresponding cavity segment through each temperature monitoring mechanism; moving the external submerged nozzle towards the direction where the cavity segment with the lowest liquid temperature is located; repeating the above two steps until the liquid temperatures in each cavity segment are consistent. The operator can adjust the nozzle according to the temperature of the liquid in each cavity segment to make it centered, so as to ensure meeting the process requirements and the needs of the continuous casting crystallization process of multi-section round billets, improve the quality of continuous casting round billets, and further stabilize the continuous casting production process, improve the production efficiency of steel and the product quality.

Description

Technical Field

[0001] The present invention mainly relates to the technical field of continuous casting submerged nozzles, and particularly to a high-precision temperature-sensing centering device for split continuous casting submerged nozzles and an application method thereof. Background Art

[0002] As an irreplaceable important industrial material at the present stage, steel products play a supporting and decisive role in the national economy and social development. The continuous casting process is the main process for the solidification and shaping of molten steel, which can significantly improve production efficiency and metal yield, and plays an important role in steel production. The continuous casting crystallization and shaping process directly affects the output and quality of subsequent continuous casting billets and steel products, and is an important proposition that steel producers have been continuously concerned about. The continuous casting submerged nozzle, as a key component connecting the tundish and the mold, has the functions of preventing secondary oxidation and splashing of the molten steel flow in the tundish, and improving the flow pattern and temperature field distribution of the molten steel flow in the mold. It can promote the removal of gas and inclusions in the molten steel, thereby stabilizing the uniform growth of the billet shell in the mold, reducing the surface quality defects of the cast billet, and improving the quality of the cast billet. The centering accuracy of the continuous casting submerged nozzle directly affects the surface quality of the cast billet. If the centering deviation of the submerged nozzle is large or the actual centering position does not meet the requirements of the continuous casting process, cracks will occur in the produced continuous casting round billet, reducing the product quality and the first-pass rate.

[0003] The position of the continuous casting submerged nozzle flows through high-temperature molten steel, and the environment is complex and inconvenient to measure. It is difficult to accurately judge the centering accuracy of the submerged nozzle by using existing measurement technologies and calculation methods. At present, whether the submerged nozzle in the continuous casting production site is centered is generally observed by the naked eye of workers and judged based on manual experience. Due to the lack of an auxiliary judgment device for the centering accuracy of the submerged nozzle, errors are likely to occur. Limited by the on-site situation, when smelting large-section round billets, the error is relatively small when judging the centering accuracy of the submerged nozzle by manual observation and experience. However, when smelting small-section round billets, the inner diameter of the mold inlet is small, and the radial distance between the lower end of the submerged nozzle is large, which is not convenient for visually observing whether the centering position of the nozzle is appropriate, resulting in a large deviation in the actual centering position of the nozzle, and cracks are likely to occur in the produced small-section round billets. Therefore, there is an urgent need for a high-precision centering device and application method for continuous casting submerged nozzles to ensure that the centering position of the nozzle meets the process requirements, meets the needs of the continuous casting crystallization process of multi-section round billets, improves the quality of continuous casting round billets, and thus stabilizes the continuous casting production process, improves the production efficiency of steel and the product quality. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a high-precision temperature-sensing centering device for split continuous casting submerged nozzles and an application method thereof.

[0005] To solve the above technical problems, the present invention adopts the following technical solutions:

[0006] The high-precision temperature-sensitive centering device for the split continuous casting submerged nozzle includes a hollow ring. The hollow ring is evenly divided into several cavity segments along the circumferential direction. Each cavity segment is filled with a liquid and is respectively connected to a temperature monitoring mechanism for monitoring the temperature of the liquid in each corresponding cavity segment through a first conduit. According to the readings of each temperature monitoring mechanism, the high and low sorting of the liquid temperature in the corresponding cavity segment can be obtained.

[0007] The temperature monitoring mechanism includes a vertical liquid column cavity. The lower end of the liquid column cavity is connected to the first conduit, and a temperature measuring rod is inserted into the upper end. The temperature measuring rod moves along the length direction under the buoyancy of the liquid in the liquid column cavity.

[0008] The centering device further includes a water circulation mechanism. The water circulation mechanism includes a normal temperature water tank and a cooling water tank. The normal temperature water tank is respectively connected to each cavity segment through a second conduit. The cooling water tank is respectively connected to each temperature monitoring mechanism through a third conduit. And the warm water tank and the cooling water tank are connected through a fourth conduit. A first pump is provided on the fourth conduit, thereby forming a circulating water path of normal temperature water tank - second conduit - cavity segment - first conduit - temperature monitoring mechanism - third conduit - cooling water tank - fourth conduit - normal temperature water tank.

[0009] A water replenishing pipe is provided on the circulating water path, and a drain pipe is provided on the cooling water tank.

[0010] The centering device further includes a heat exchange mechanism. The heat exchange mechanism includes a heat exchanger connected in series to the fourth conduit. The heat exchanger is respectively connected to the upper parts of each liquid column cavity through an air pipe so that the steam in the liquid column cavity can enter the heat exchanger and exchange heat with the liquid in the fourth conduit.

[0011] The heat exchanger is provided with an exhaust steam overflow pipe and / or a condensate water tank.

[0012] The centering device further includes a single-layer or multi-layer heat conducting ring detachably arranged inside the hollow ring for transferring heat to the hollow ring.

[0013] The heat conducting ring is hollow and is evenly divided into heat conducting cavity segments corresponding to each cavity segment along the circumferential direction. Each heat conducting cavity segment is filled with an oil liquid.

[0014] The heat conducting cavity segments are connected to the cavity segments and adjacent heat conducting cavity segments through heat conducting rods.

[0015] Then, the present invention discloses an application method of the high-precision temperature-sensitive centering device for the split continuous casting submerged nozzle. The application method uses the above centering device and includes the following steps:

[0016] Step S1, sleeving the hollow ring on an external submerged nozzle;

[0017] Step S2: Obtain the high-low sorting of the liquid temperatures in the corresponding cavity segments through each temperature monitoring mechanism;

[0018] Step S3: Move the external submerged nozzle towards the direction where the cavity segment with the lowest liquid temperature is located;

[0019] Step S4: Repeat Step S2 and Step S3 until the liquid temperatures in each cavity segment are consistent.

[0020] Compared with the prior art, the advantages of the present invention are as follows:

[0021] By dividing the hollow ring filled with liquid into several independent cavity segments, using the first conduit to lead out the liquid in each cavity segment, and using the temperature monitoring mechanism to monitor their temperatures respectively, it can be inversely deduced from the principle of the non-uniform spatial distribution of the heat flux in the radiation heat transfer process that when the temperature information obtained by each temperature monitoring mechanism is the same, it can be inferred that the high-temperature molten steel flow and the external submerged nozzle are in the centered state. On the contrary, it can be inferred that the high-temperature molten steel flow is closer to the cavity segment with a higher liquid temperature and farther from the cavity segment with a lower liquid temperature, that is, the centering of the external submerged nozzle has deviated. According to this information, the operator can adjust the external submerged nozzle to make it centered, so as to ensure that the centering position of the external submerged nozzle meets the process requirements and satisfies the needs of the continuous casting crystallization process of multi-section round billets, improve the quality of the continuous casting round billets, and further stabilize the continuous casting production process, improve the production efficiency of steel and the product quality. Description of the Drawings

[0022] Figure 1 is a schematic diagram of the centering position of the continuous casting submerged nozzle;

[0023] Figure 2 is a schematic diagram of the radiation energy receiving process of the radiation plates at different distances from the radiation source;

[0024] Figure 3 is a schematic diagram of the structure of the centering device;

[0025] Figure 4 is a schematic diagram of the structures of the hollow ring and the heat conduction ring (closed state);

[0026] Figure 5 is a schematic diagram of the structures of the hollow ring and the heat conduction ring (expanded state);

[0027] Figure 6 is a schematic diagram of the positions of the heat conduction cavity segment and the heat conduction rod;

[0028] Figure 7 is a schematic diagram of the positions of the hollow ring, the heat conduction ring and the external submerged nozzle.

[0029] The reference numerals in the figure denote: 1. Hollow ring; 11. Chamber section; 12. Hinge; 2. First conduit; 3. Temperature monitoring mechanism; 31. Liquid column chamber; 32. Temperature measuring rod; 4. Water circulation mechanism; 41. Normal temperature water tank; 42. Cooling water tank; 43. Second conduit; 431. Water distributor; 432. Front section; 433. Rear section; 434. Branch; 435. Second pump; 44. Third conduit; 45. Fourth conduit; 46. First pump; 47. Make-up water pipe; 48. Drain pipe; 5. Heat exchange mechanism; 51. Heat exchanger; 511. Exhaust steam overflow pipe; 512. Condensate water tank; 52. Gas pipe; 6. Heat conducting ring; 61. Heat conducting chamber section; 62. Heat conducting rod; 7. External immersion nozzle; 8. Bracket. Specific embodiments

[0030] The present invention will be further described in detail below in conjunction with the accompanying drawings of the specification and specific embodiments.

[0031] As Figures 1 to 7 shown, the split continuous casting immersion nozzle high-precision temperature sensor centering device of this embodiment includes a hollow ring 1. The hollow ring 1 is evenly divided along the circumferential direction to form a plurality of chamber sections 11. Each chamber section 11 is filled with liquid and is respectively connected to a temperature monitoring mechanism 3 for monitoring the temperature of the liquid in each corresponding chamber section 11 through a first conduit 2. According to the readings of each temperature monitoring mechanism 3, the high and low sorting of the liquid temperature in the corresponding chamber section 11 can be obtained. Monitoring the deviation of the centering position of the external immersion nozzle 7, that is, obtaining whether the center position of the cylindrical high-temperature molten steel flow in the tundish coincides with the center position of the external immersion nozzle 7 and the difference information of the coincidence degree. In essence, it is a monitoring and comparison of a length or distance signal. When the centering position deviation of the external immersion nozzle 7 is small, that is, the center position of the cylindrical high-temperature molten steel flow coincides with the center position of the circular external immersion nozzle 7 or the coincidence degree is high, the distances from the high-temperature molten steel flow to the external immersion nozzle 7 in all directions are basically the same, as Figure 1 (a) shown; when the centering position deviation of the external immersion nozzle 7 is large, that is, the distance from the cylindrical high-temperature molten steel flow to one side of the external immersion nozzle 7 is close and the distance to the other side is far, as Figure 1 (b) shown. According to the principle of non-uniformity of the spatial distribution of heat flux in the radiation heat transfer process, for a high-temperature radiation object, it can be known from Lambert's cosine law that although the energy radiated from the unit visible area of a black body (high-temperature radiation object) and falling into the unit solid angle in any direction in space, that is, the directional radiation intensity, is a fixed value and is independent of the spatial direction, but based on the unit actual radiation area as the measurement basis, the energy radiated from the unit area of the black body (high-temperature radiation object) is unevenly distributed in different directions in space and changes according to the cosine law of the spatial dimension angle, being the largest in the direction perpendicular to the surface and zero in the direction parallel to the surface. From Figure 1It can be known that when two identical radiation plates L1 and L2 are at different distances from the point radiation source O, for the radiation plate L1, its visible radiation area for the point radiation source O is the length of the radiation plate L1, and the area containing the received radiant heat is the AOD area. For the radiation plate L2 that is farther from the point radiation source O, the area containing the received radiant heat is the BOC area, and its visible radiation area is equivalent to the length of L3 at the distance of L1. Obviously, the radiant heat flow received by the radiation plate L1 closer to the point radiation source O is significantly greater than that received by the radiation plate L2 farther from the point radiation source O. Therefore, the temperature on the surface of the radiation plate L1 will be higher than the temperature on the surface of the radiation plate L2. Based on this, it can be known that due to the heat of the high-temperature molten steel flow spreading around, when there is a deviation in the alignment of the external submerged nozzle 7, that is, when the high-temperature molten steel flow is closer to one side of the external submerged nozzle 7 and farther from the opposite side, the radiation heat flow received by the closer side of the external submerged nozzle 7 is relatively more and the surface temperature is higher. On the contrary, the surface temperature of the farther side of the external submerged nozzle 7 is lower. The hollow ring 1 is sleeved on the external submerged nozzle 7 in an aligned manner, so that the distances between each part of the external submerged nozzle 7 and the hollow ring 1 are kept consistent. By clarifying the temperature change of the heat transfer medium inside the alignment device, the alignment position deviation of the external submerged nozzle can be determined. By dividing the hollow ring 1 filled with liquid into several independent cavity segments 11, and using the conduit 1 to lead out the liquid in each cavity segment 11 and using the temperature monitoring mechanism 3 to monitor its temperature respectively, it can be inversely deduced from the non-uniformity principle of the spatial distribution of the heat flow in the above-mentioned radiation heat transfer process that when the temperature information obtained by each temperature monitoring mechanism 3 is the same, it can be inferred that the high-temperature molten steel flow is in an aligned state with the external submerged nozzle 7. On the contrary, it can be inferred that the high-temperature molten steel flow is closer to the cavity segment 11 with a higher liquid temperature and farther from the cavity segment 11 with a lower liquid temperature, that is, the alignment of the external submerged nozzle 7 has deviated. According to this information, the operator can adjust the external submerged nozzle 7 to make it aligned, so as to ensure that the alignment position of the external submerged nozzle 7 meets the process requirements and satisfies the needs of the multi-section round billet continuous casting crystallization process, improve the quality of the continuous casting round billet, and further stabilize the continuous casting production process, improve the steel production efficiency and product quality.

[0032] It should be noted that the method of using a thermocouple for temperature monitoring cannot dissipate heat during the continuous casting process because the high-temperature molten steel flow continuously radiates heat outward, that is, it cannot be reset. Therefore, the monitoring system of this structural form can only be used once and cannot perform real-time dynamic monitoring of the continuous casting process. However, the technical solution disclosed in this application uses the liquid temperature to reflect the distance relationship between the high-temperature molten steel flow and the external submerged nozzle 7, and there is no reset problem, so it has the ability of continuous monitoring.

[0033] Preferably, each cavity section 11 is independent of each other and hinged in sequence; by flipping, each cavity section 11 can be unfolded or folded to form an annular structure. Further, a hinge 12 is provided on the cavity section 11, and two adjacent cavity sections 11 are pivotally connected through the hinge 12. Further still, the two cavity sections 11 at the ends are snap-connected and fixed in the folded state to prevent the hollow ring 1 from unfolding by itself.

[0034] In this embodiment, the temperature monitoring mechanism 3 includes a vertical liquid column cavity 31. The lower end of the liquid column cavity 31 is communicated with the first conduit 2, and a temperature measuring rod 32 is inserted into the upper end thereof. The temperature measuring rod 32 moves along the length direction under the buoyancy of the liquid in the liquid column cavity 31. The volume of the liquid expands during the heating process, and the liquid level in the liquid column cavity 31 rises accordingly. Under the buoyancy, the temperature measuring rod 32 rises following the liquid level, and by observing the rising distance of the temperature measuring rod 32, the temperature rise amplitude of the liquid in the corresponding cavity section 11 can be known.

[0035] Preferably, the temperature measuring rod 32 is configured as a temperature measuring instrument, such as a thermometer, for directly obtaining the liquid temperature data in the liquid column cavity 31.

[0036] In this embodiment, the centering device further includes a water circulation mechanism 4; the water circulation mechanism 4 includes a normal temperature water tank 41 and a cooling water tank 42. The normal temperature water tank 41 is communicated with each cavity section 11 through a second conduit 43 respectively, the cooling water tank 42 is communicated with each temperature monitoring mechanism 3 through a third conduit 44 respectively, and the normal temperature water tank 41 and the cooling water tank 42 are communicated through a fourth conduit 45. A pump 46 is provided on the fourth conduit 45, thereby forming a circulating water path of the normal temperature water tank 41 - the second conduit 43 - the cavity section 11 - the first conduit 2 - the temperature monitoring mechanism 3 - the third conduit 44 - the cooling water tank 42 - the fourth conduit 45 - the normal temperature water tank 41. The cooling water tank 42 is provided with a temperature reduction mechanism, which is a prior art and can cool the liquid. The temperature of the high-temperature molten steel flow flowing out from the lower part of the tundish is high, so that the centering device will be in a high-temperature state for a long time, which may cause damage. By setting the circulating water path, the high-temperature liquid can flow out from each temperature monitoring mechanism 3 and be cooled, so that the overall temperature of the centering device drops, thereby playing a protective role.

[0037] Specifically, in order to further protect the centering device, a gap is left between the hollow ring 1 and the external submerged nozzle 7.

[0038] In this embodiment, the circulating water path is provided with a makeup water pipe 47, and the cooling water tank 42 is provided with a drain pipe 48. The liquid flowing through each temperature monitoring mechanism 3 is heated under the thermal radiation of the high-temperature molten steel flow. By providing the drain pipe 48 in the cooling water tank 42, the high-temperature liquid can be directly discharged before cooling treatment and applied to other links in production, thereby achieving an energy-saving effect. At the same time, by providing the makeup water pipe 47 in the circulating water path, the liquid released by the drain pipe 48 can be replenished in time, so as to keep the liquid in the circulating water path sufficient.

[0039] In this embodiment, the centering device further includes a heat exchange mechanism 5; the heat exchange mechanism 5 includes a heat exchanger 51 connected in series to the fourth conduit 45. The heat exchanger 51 is respectively connected to the upper parts of each liquid column cavity 31 through an air pipe 52, so that the steam in the liquid column cavity 31 can enter the heat exchanger 51 and exchange heat with the liquid in the fourth conduit 45. The heat exchanger 51 is provided with an exhaust steam overflow pipe 511 and / or a condensate water tank 512. By providing the air pipe 52 that respectively connects the heat exchanger 51 and each liquid column cavity 31, the liquid after heating and vaporization can enter the heat exchanger 51 through this, and exchange heat with the low-temperature liquid that enters the heat exchanger 51 after being cooled by the cooling water tank 42, thereby forming condensate. Also, by providing the condensate water tank 512 connected to the heat exchanger 51, the condensate can be collected and utilized. At the same time, by providing the exhaust steam overflow pipe 511 connected to the heat exchanger 51, the high-temperature steam can also be directly discharged for production use, thereby achieving an energy-saving effect.

[0040] In this embodiment, the centering device further includes a single-layer or multi-layer heat conducting ring 6 detachably arranged inside the hollow ring 1 and used for transferring heat to the hollow ring 1. The heat conducting ring 6 is hollow, and is evenly divided circumferentially to form heat conducting cavity segments 61 corresponding to each cavity segment 11. Each heat conducting cavity segment 61 is filled with oil. The heat conducting cavity segments 61 and the cavity segments 11 and adjacent heat conducting cavity segments 61 are connected by heat conducting rods 62. Since the outer diameters of the external submerged nozzles 7 of different specifications and models are different, in order to be adaptable, the heat conducting ring 6 is set as a single-layer or multi-layer structure, that is, when the outer diameter of the external submerged nozzle 7 is larger, a single-layer heat conducting ring 6 can be selected to form an inner diameter adapted thereto; correspondingly, when the outer diameter of the external submerged nozzle 7 is smaller, a multi-layer heat conducting ring 6 can be selected to form an inner diameter adapted thereto. In order to achieve heat conduction between the layers of the heat conducting ring 6, heat conducting rods 62 are inserted between adjacent layers of the heat conducting ring 6. On the one hand, the heat conducting rods 62 play a connecting role and prevent the adjacent layers of the heat conducting ring 6 from separating; on the other hand, the heat conducting ring 6 can transfer heat energy from the inner layer to the outer layer.

[0041] Specifically, the heat conducting rod 62 is configured as a heat pipe. The heat pipe is a prior art, which is a special material with a fast temperature equalization characteristic. The hollow metal tube body makes it light in weight, and its fast temperature equalization characteristic makes it have excellent thermal superconductivity. The heat pipe mainly relies on the vapor-liquid phase change of the working fluid to transfer heat, and the thermal resistance is very small, so it has a very high thermal conductivity. Compared with metals such as silver, copper, and aluminum, a heat pipe per unit weight can transfer several orders of magnitude more heat, has a strong axial heat transfer capacity, and can independently change the heating area of the evaporation section or the cooling section, that is, heat is input with a smaller heating area and heat is output with a larger cooling area, or the heat pipe can input heat with a larger heat transfer area and output heat with a smaller cooling area, so that the heat flux density can be changed. After the hot end of the heat pipe is heated, the liquid inside it will absorb heat and evaporate, and at the same time, after encountering the cold end of the heat pipe, it will liquefy and release the heat it carries, and at the same time flow back to the hot end of the heat pipe along the internal pipe wall for the next cycle, and so on, the cycle continues to achieve high-speed and efficient heat transfer with the help of the phase change of the internal fluid.

[0042] Further, the conduit 2 43 includes a front section 432 and a rear section 433 connected through a water distributor 431. The front section 432 forms two parallel branches 434, one of which is provided with a pump 2 435. The pump 2 435 is used to pressurize and increase the speed of the circulating water to solve the problems of slow circulating water flow rate and poor heat exchange effect when the temperature sensing centering device works in a continuous high temperature environment. During the normal operation of the device, generally only one of the branches 434 is used. When the water supply demand is large, the pump 2 435 can be activated, and both branches 434 can be activated at the same time. Preferably, the rear section 433 can be set as an annular pipe to avoid the external immersion water inlet 7. At the same time, in order to avoid the upper part of the external immersion water inlet 7 from excessively radiating heat to the rear section 433 to affect the monitoring results, without changing the equipment layout, the rear section 433 is kept as far away from the external immersion water inlet 7 as possible, and the pipe wall is thickened, or high-temperature resistant insulation materials are laid on its surface to reduce interference.

[0043] Furthermore, valves are provided on conduit three 44 , conduit four 45 , the water supply pipe 47 , the drain pipe 48 , the exhaust steam overflow pipe 511 , the air pipe 52 , the two branches 434 , and between the heat exchanger 51 and the condensate tank 512 .

[0044] Furthermore, the centering device is supported by the bracket 8 to ensure that the axial direction of the hollow ring 1 is always vertical.

[0045] Then, the present invention also discloses an application method of the above-mentioned centering device. In one embodiment, the application method is applied to the above-mentioned centering device and comprises the following steps:

[0046] Step S1, sleeve the hollow ring 1 on the external immersion nozzle 7;

[0047] Step S2: Obtain the high-low sorting of the liquid temperatures in the corresponding cavity segments 11 through each temperature monitoring mechanism 3;

[0048] Step S3: Move the external submerged nozzle 7 towards the direction where the cavity segment 11 with the lowest liquid temperature is located;

[0049] Step S4: Repeat Step S2 and Step S3 until the liquid temperatures in all cavity segments 11 are consistent.

[0050] According to the principle of non-uniformity of the spatial distribution of heat flux in the radiation heat transfer process, since the heat of the high-temperature molten steel flow transmits to the surroundings, when there is a deviation in the alignment of the external submerged nozzle 7, that is, when the high-temperature molten steel flow is closer to one side of the external submerged nozzle 7 and farther from the opposite side, the external submerged nozzle 7 receives relatively more radiant heat flux and has a higher surface temperature at the closer side, and conversely, the surface temperature at the farther side of the external submerged nozzle 7 is lower. The hollow ring 1 is sleeved on the external submerged nozzle 7 in an aligned manner, so that the distances between the external submerged nozzle 7 and each part of the hollow ring 1 are kept consistent. By clarifying the temperature change of the heat transfer medium inside the alignment device, the alignment position deviation of the external submerged nozzle can be determined. Specifically, when the temperature information obtained by each temperature monitoring mechanism 3 is the same, it can be inferred that the high-temperature molten steel flow is in an aligned state with the external submerged nozzle 7. On the contrary, it can be inferred that the high-temperature molten steel flow is closer to the cavity segment 11 with a higher liquid temperature and farther from the cavity segment 11 with a lower liquid temperature, that is, the alignment of the external submerged nozzle 7 has deviated. At this time, through Step S3, the external submerged nozzle 7 is moved towards the direction where the cavity segment 11 with the lowest liquid temperature is located. This movement reduces the distance between the original cavity segment 11 with the lowest liquid temperature and the high-temperature molten steel flow, thereby increasing the temperature of the liquid in this cavity segment 11. Then, through Step S4, the temperature information measured by each temperature monitoring mechanism 3 is obtained again to determine whether the external submerged nozzle 7 is aligned. If it is not aligned, the external submerged nozzle 7 is moved again. If the liquid temperatures in all cavity segments 11 measured by each temperature monitoring mechanism 3 are consistent, it means that the external submerged nozzle 7 is in an aligned state, and the movement can be stopped. Thus, it can be ensured that the alignment position of the external submerged nozzle 7 meets the process requirements and satisfies the needs of the multi-section round billet continuous casting crystallization process, improving the quality of the continuous casting round billet, and further stabilizing the continuous casting production process, improving the steel production efficiency and product quality.

[0051] When using the centering device, first connect the equipment and inject liquid. Keep the whole equipment horizontally placed, adjust the states of each valve, make up the liquid to the circulating water path through the water replenishing pipe 47 and adjust the liquid levels in each liquid column cavity 31 to be flush. During this process, the gas in the circulating water path is discharged through the exhaust steam pipe 511. After the liquid replenishment is completed, adjust each valve to make the centering device in a closed state. When the tundish starts pouring, the operator unfolds the flipping cavity section 11 and moves it close to the external submerged nozzle 7, and then flips it in the reverse direction to make the cavity section 11 close around the external submerged nozzle 7. Subsequently, move the centering device axially downward along the external submerged nozzle 7 so that the hollow ring 1 is clamped at the upper opening position of the mold and forms a good contact with the wall surface of the circular area of the upper opening of the mold. And in this state, the bracket 8 just contacts the bottom surface of the operating platform of the upper opening of the mold to form a support. Then, obtain the centering situation through observing the temperature monitoring mechanism and calibrate according to the centering situation. During calibration, it is necessary to first drain the original liquid in the device, initialize the centering device, and reset the reading of the temperature monitoring mechanism 3. During this process, it is possible to choose whether to turn on the second pump 435 according to the liquid temperature to speed up the progress.

[0052] Due to the large mechanical vibration during the continuous casting production process, the external submerged nozzle 7 is subjected to the impact of the high-temperature molten steel flow inside. During continuous casting, the centering position will shift, thus forming an unfavorable situation where the initial centering accuracy is high and the subsequent centering accuracy is poor. Therefore, it is necessary to use the centering device for real-time monitoring and calibration.

[0053] The hollow ring 1 is sleeved on the external submerged nozzle 7 and continuously receives thermal radiation, causing the liquid temperature to continuously rise. For safety reasons, it is necessary to control the liquid temperature and ensure that it is within a suitable range. At this time, by adjusting the valve, while ensuring that the flow rates of each rear section 433 are the same, the flow rate of the normal temperature water in the pipeline is reduced, so as to ensure that not too much heated water is displaced, and it functions to slowly remove heat and slowly displace the heated water, protecting the entire device. When the low-flow normal temperature water enters each cavity section 11, a certain amount of heated water will be displaced. The valve is adjusted so that the flow rate of the normal temperature water in each rear section 433 is equal to the flow rate of the heated water in the conduit 1, thereby ensuring that the total liquid volume in the system and the liquid level height in each liquid column cavity 31 remain unchanged. The heated water is gradually discharged into the cooling water tank 42, and the total energy of the middle device remains unchanged. The radiant heat from the external submerged nozzle 7 is gradually removed through continuous circulating water, so the temperature readings of each temperature measuring rod remain unchanged. The heated water then stands still in the cooling water tank 42 to cool down. After its temperature drops, the pump 1 46 starts, and the liquid in the cooling water tank 42 enters the normal temperature water tank 41 and mixes with the existing normal temperature water with a larger mass inside, and then participates in the circulation process. Because the existing reserve of normal temperature water in the normal temperature water tank 41 is significantly larger than the mass of the cooled water in the cooling water tank 42, if the cooled water has a poor cooling effect and its temperature is higher than that of the normal temperature water, the relatively small mass of the cooled water injected into the normal temperature water in the normal temperature water tank 41 will not overly affect the temperature of the normal temperature water, thus ensuring the temperature consistency during the subsequent normal temperature water replenishment process in the system and reducing errors. Moreover, due to the action of the heat exchange mechanism 5, condensed liquid or liquid steam can be obtained. When the liquid is water, the water vapor can be discharged to increase the environmental humidity and improve the body feeling.

[0054] Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, make many possible changes and modifications to the technical solution of the present invention by using the above-disclosed technical content, or modify it into equivalent embodiments with equivalent changes. Therefore, all content that does not depart from the technical solution of the present invention, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention shall fall within the scope of protection of the technical solution of the present invention.

Claims

1. The high-precision temperature-sensing centering device for the split continuous casting submerged nozzle is characterized in that: It includes a hollow ring (1), and the hollow ring (1) is evenly divided circumferentially to form a number of cavity segments (11). Each of the cavity segments (11) is filled with liquid and is respectively connected to a temperature monitoring mechanism (3) for monitoring the temperature of the liquid in each corresponding cavity segment (11) through a first conduit (2). According to the readings of each temperature monitoring mechanism (3), the high-low sorting of the liquid temperature in the corresponding cavity segment (11) can be obtained. The centering device further includes a water circulation mechanism (4); the water circulation mechanism (4) includes a normal temperature water tank (41) and a cooling water tank (42). The normal temperature water tank (41) is respectively connected to each cavity segment (11) through a second conduit (43). The cooling water tank (42) is respectively connected to each temperature monitoring mechanism (3) through a third conduit (44). And the normal temperature water tank (41) is connected to the cooling water tank (42) through a fourth conduit (45). A first pump (46) is provided on the fourth conduit (45), thereby forming a circulating water path of normal temperature water tank (41) - second conduit (43) - cavity segment (11) - first conduit (2) - temperature monitoring mechanism (3) - third conduit (44) - cooling water tank (42) - fourth conduit (45) - normal temperature water tank (41).

2. The high-precision temperature-sensing centering device for the split continuous casting submerged nozzle according to claim 1, wherein: The temperature monitoring mechanism (3) includes a vertical liquid column cavity (31). The lower end of the liquid column cavity (31) is connected to the first conduit (2), and a temperature measuring rod (32) is inserted into the upper end. The temperature measuring rod (32) moves along the length direction under the buoyancy of the liquid in the liquid column cavity (31).

3. The high-precision temperature-sensing centering device for the split continuous casting submerged nozzle according to claim 1, characterized in that: A makeup water pipe (47) is provided in the circulating water path, and a drain pipe (48) is provided in the cooling water tank (42).

4. The high-precision temperature-sensing centering device for the split continuous casting submerged nozzle according to claim 1, characterized in that: The centering device further includes a heat exchange mechanism (5); the heat exchange mechanism (5) includes a heat exchanger (51) connected in series to the fourth conduit (45). The heat exchanger (51) is respectively connected to the upper parts of each liquid column cavity (31) through an air pipe (52) so that the steam in the liquid column cavity (31) can enter the heat exchanger (51) and exchange heat with the liquid in the fourth conduit (45).

5. The high-precision temperature-sensing centering device for the split continuous casting submerged nozzle according to claim 4, characterized in that: The heat exchanger (51) is provided with an exhaust steam overflow pipe (511) and / or a condensate water tank (512).

6. The high-precision temperature-sensitive centering device for the split continuous casting submerged nozzle according to claim 1, characterized in that: The centering device further includes a single-layer or multi-layer heat conduction ring (6) detachably arranged inside the hollow ring (1) for transferring heat to the hollow ring (1).

7. The high-precision temperature-sensing centering device for the split continuous casting submerged nozzle according to claim 6, characterized in that: The heat conduction ring (6) is hollow and is evenly divided circumferentially to form heat conduction cavity segments (61) corresponding to each cavity segment (11). Each of the heat conduction cavity segments (61) is filled with oil.

8. The high-precision temperature-sensing centering device for the split continuous casting submerged nozzle according to claim 7, wherein: The heat conduction cavity segments (61) are connected to the cavity segments (11) and adjacent heat conduction cavity segments (61) through heat conduction rods (62).

9. Application method of high-precision temperature-sensing centering device for split continuous casting submerged nozzle, characterized in that: Using the centering device according to any one of claims 1-8, and including the following steps: Step S1, sleeving the hollow ring (1) on an external submerged nozzle (7); Step S2, obtaining the high-low sorting of the liquid temperature in the corresponding cavity segment (11) through each temperature monitoring mechanism (3); Step S3, moving the external submerged nozzle (7) towards the direction where the cavity segment (11) with the lowest liquid temperature is located; Step S4, repeat Step S2 and Step S3 until the liquid temperatures in each cavity segment (11) are consistent.

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