Crystallizer water cooling control method

Abstract

The invention discloses a crystallizer water cooling control method, and relates to the technical field of continuous casting, a crystallizer water cooling system is applied, the crystallizer water cooling system comprises a water supply end, a water inlet pipeline, a water return pipeline and a bypass pipeline, the water inlet pipeline is provided with a pressure gauge, the bypass pipeline is connected between the water inlet pipeline and the water return pipeline, and the bypass pipeline is provided with an adjusting valve. The crystallizer water cooling control method comprises the steps that the reading of the pressure gauge is obtained, whether the pressure building phenomenon exists in the water inlet pipeline or not is judged according to the reading, when the pressure building phenomenon exists in the water inlet pipeline, the real-time value of the thickness of the copper plate is obtained, the adjusting valve is adjusted and controlled according to the real-time value of the thickness, and therefore the pressure building phenomenon of the water inlet pipeline is relieved. Pressure is released through the bypass pipeline, the pressure of the water inlet pipeline can be reduced to be lower than an allowable pressure value by quickly regulating and controlling the regulating valve, and the regulating valve is regulated and controlled according to the real-time value of the thickness, so that the method has the advantages of being high in response speed and accurate in regulation.

Description

Technical Field

[0001] This invention relates to the field of continuous casting technology, and in particular to a method for controlling water cooling in a crystallizer. Background Technology

[0002] In the casting machine production process, the copper plate of the crystallizer is the core component that comes into direct contact with the high-temperature molten steel. Its main function is to rapidly cool and solidify the molten steel within it, forming the initial shell of the cast billet with a specific shape and specifications. However, as the copper plate of the crystallizer gradually becomes thinner, its cooling capacity gradually increases. Therefore, in order to control the cooling capacity of the copper plate of the crystallizer, measures are taken to reduce the valve opening, thereby reducing the cooling water flow rate.

[0003] However, the output flow rate of the cooling water supply to the crystallizer is currently fixed. When the valve opening inside the crystallizer decreases, the pressure in the water supply pipeline will rise, resulting in pressure buildup, which has a significant impact on the pipeline life and the stable operation of the equipment. Summary of the Invention

[0004] To address the aforementioned problems, this application provides a method for controlling water cooling in a crystallizer.

[0005] This application provides a crystallizer water cooling control method, which applies a crystallizer water cooling system. The crystallizer water cooling system includes a water supply end, an inlet pipe, a return pipe, and a bypass pipe. The inlet pipe is connected between the outlet of the water supply end and the water channel inlet of the copper plate of the crystallizer. A pressure gauge is installed on the inlet pipe. The return pipe is connected between the return port of the water supply end and the water channel outlet of the copper plate of the crystallizer. The bypass pipe is connected between the inlet pipe and the return pipe and is equipped with a regulating valve. The crystallizer water cooling control method includes: obtaining the reading of the pressure gauge; determining whether there is a pressure buildup in the inlet pipe based on the reading; when there is a pressure buildup in the inlet pipe, obtaining the real-time value of the thickness of the copper plate; and adjusting the regulating valve based on the real-time value of the thickness to relieve the pressure buildup in the inlet pipe.

[0006] In some implementations, the copper plate of the crystallizer has an initial thickness value. During the process of regulating the control valve based on the real-time thickness value, the control valve is regulated based on the difference between the real-time thickness value and the initial thickness value.

[0007] In some implementations, the flow rate of the crystallizer is reduced by 10% for every 1mm decrease in the thickness of the copper plate, and a flow meter is installed on the inlet pipe.

[0008] In some implementations, the regulating valve is adjusted in multiple steps.

[0009] In some implementations, when the control is performed in a manner of multiple adjustments, the water pressure change in the inlet pipe is controlled to be any parameter between 2% and 5% of the initial operating pressure value during each adjustment.

[0010] In some implementations, a random sampling method is used to obtain the real-time value of the copper plate thickness and determine whether the regulating valve needs to be adjusted.

[0011] In some implementations, the flow meter is located relatively close to the water supply end on the inlet pipe.

[0012] In some implementations, the pressure gauge on the inlet pipe is relatively close to the crystallizer.

[0013] In some implementations, the bypass pipe is equipped with two regulating valves.

[0014] In some implementations, on the bypass pipe, two regulating valves are located near the inlet pipe and the return pipe, respectively.

[0015] The beneficial effects of this application are as follows: It provides a crystallizer water cooling control method. First, the applied crystallizer water cooling system is defined. In the crystallizer water cooling system, the crystallizer is the water-using end. In addition to the conventional inlet and return water pipes set between the water supply and water-using ends, a bypass pipe is also set between the inlet and return water pipes. The bypass pipe is equipped with a regulating valve. Based on this, crystallizer water cooling control is performed. First, the pressure gauge reading needs to be obtained. Based on the reading, it is determined whether there is a back pressure phenomenon in the inlet water pipe. When there is a back pressure phenomenon in the inlet water pipe, the real-time value of the copper plate thickness is obtained. Based on the real-time value of the thickness, the regulating valve is adjusted to relieve the back pressure phenomenon in the inlet water pipe. This application relieves pressure through the bypass pipe. By quickly adjusting the regulating valve, the pressure in the inlet water pipe can be reduced to below the allowable pressure value. The method of adjusting the regulating valve based on the real-time value of the thickness has the advantages of fast response speed and precise adjustment. It quickly solves the back pressure phenomenon in the inlet water pipe. When applying this application, no equipment modification is required, and the purpose of reducing pipeline pressure can be achieved at a low cost. At the same time, the method is simple to operate, easy to implement, and has a wide range of applications. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention.

[0017] Figure 1 A schematic diagram of the crystallizer water cooling system used in the crystallizer water cooling control method provided in this application.

[0018] Attached diagram labels: 10-Water supply end, 20-Copper plate, 30-Inlet pipe, 31-Pressure gauge, 32-Flow meter, 40-Return pipe, 50-Bypass pipe, 51-Regulating valve. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0020] Furthermore, reference numerals and / or reference letters may be repeated in different examples in this application. Such repetition is for simplification and clarity purposes and does not in itself indicate a relationship between the various embodiments and / or settings discussed. In addition, this application provides examples of various specific processes and materials; however, those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0021] In daily production, pipelines are often used to transport cooling water. During the transportation of cooling water, water pumps are used to circulate the cooling water in the pipelines. Some factories, due to budget constraints in the early stages of production, did not install variable frequency water pumps, and the pump power could not be adjusted. When water usage decreases, the water pressure inside the pipes rises, eventually exceeding the pipes' pressure limit. Pipes operating under high pressure for extended periods are prone to damage, affecting their lifespan, and in severe cases, may even rupture, causing significant economic losses.

[0022] This application specifically addresses the continuous casting process. In the casting machine production process, the copper plate of the crystallizer is a core component that directly contacts the high-temperature molten steel. Its main function is to rapidly cool and solidify the molten steel within it, forming the initial shell of the cast billet with a specific shape and specifications. However, as the copper plate of the crystallizer gradually becomes thinner, its cooling capacity gradually increases. Therefore, in order to control the cooling capacity of the copper plate of the crystallizer, measures are taken to reduce the valve opening, thereby reducing the cooling water flow rate.

[0023] However, the output flow rate of the cooling water supply to the crystallizer is currently fixed. When the valve opening inside the crystallizer decreases, the pressure in the water supply pipeline will rise, resulting in pressure buildup, which has a significant impact on the pipeline life and the stable operation of the equipment.

[0024] To address the aforementioned issues, this application provides a crystallizer water cooling control method, which employs a crystallizer water cooling system.

[0025] First, the water cooling system for the crystallizer in the application is defined; please refer to [reference needed]. Figure 1The crystallizer in the crystallizer water cooling system is used as the water-using end, specifically the copper plate 20 of the crystallizer. The copper plate 20 is the structure in direct contact with the molten steel, and it contains water channels. The circulating water channels form an inlet and an outlet on the copper plate 20. An inlet pipe 30 connects the outlet of the water supply end 10 to the inlet of the water channel on the copper plate 20 of the crystallizer, and a return pipe 40 connects the return outlet of the water supply end 10 to the outlet of the water channel on the copper plate 20 of the crystallizer. In addition to the conventional inlet pipe 30 and return pipe 40 between the water supply end 10 and the water-using end, a bypass pipe 50 is also provided between the inlet pipe 30 and the return pipe 40. The bypass pipe 50 is equipped with a regulating valve 51, and a pressure gauge 31 is installed on the inlet pipe 30.

[0026] In the water cooling control method for the crystallizer, it is first necessary to obtain the real-time pressure value inside the inlet pipe 30, specifically by obtaining the reading of pressure gauge 31. Based on the reading of pressure gauge 31, it is determined whether there is pressure buildup in the inlet pipe 30. As the copper plate 20 of the crystallizer gradually becomes thinner, the cooling capacity gradually increases. Therefore, in order to control the cooling capacity of the copper plate 20 of the crystallizer, measures such as reducing the valve opening and thus reducing the cooling water flow rate are taken. However, currently the output water flow rate of the cooling water supply end 10 of the crystallizer is fixed. After the valve opening inside the crystallizer is reduced, the pressure in the water supply pipeline will rise, resulting in pressure buildup.

[0027] When there is pressure buildup in the inlet pipe 30, it is necessary to obtain the real-time value of the thickness of the copper plate 20. Based on the real-time value of the thickness, the regulating valve 51 is adjusted to relieve the pressure buildup in the inlet pipe 30. This application innovatively links the real-time thickness of the copper plate 20 with the adjustment of the regulating valve 51, which can quickly and accurately achieve the desired adjustment of the regulating valve 51.

[0028] This application uses a bypass pipe 50 to release pressure, and the pressure in the inlet pipe 30 can be reduced to below the allowable pressure value by quickly adjusting the regulating valve 51. The application achieves the advantages of fast response and precise adjustment by adjusting the regulating valve 51 according to the real-time value of the thickness, and quickly solves the pressure stagnation phenomenon in the inlet pipe 30.

[0029] When applying the solution of this application, no equipment modification is required, and the purpose of reducing pipeline pressure can be achieved at a low cost. At the same time, the method is simple to operate, easy to implement, and has a wide range of applications.

[0030] Regarding the acquisition of the real-time value of the thickness of the copper plate 20, existing thickness measurement methods can be used to measure the thickness of the copper plate 20 in the crystallizer. This application does not innovate the specific method of thickness measurement, and will not elaborate on it here.

[0031] In some embodiments, the copper plate 20 of the crystallizer has an initial thickness value. During the process of regulating the regulating valve 51 based on the real-time thickness value, the regulating valve 51 is regulated based on the difference between the real-time thickness value and the initial thickness value.

[0032] In some embodiments, the copper plate 20 of the crystallizer is adjusted by regulating valve 51 according to the rule that the water flow rate of the crystallizer decreases by 10% for every 1 mm decrease in thickness, and the water inlet pipe 30 is equipped with flow meter 32.

[0033] For example, the thickness of the copper plate 20 in the crystallizer ranges from 45 to 39 mm. The thickness of 45 mm corresponds to a water flow rate of 8500 L / min for the copper plate 20 in the crystallizer. As the thickness of the copper plate 20 gradually decreases, the water flow rate decreases by 10% for every 1 mm decrease.

[0034] When the initial thickness of the copper plate 20 in the crystallizer is 45mm, the water flow rate of the copper plate 20 in the crystallizer is 8500L / min, the valve opening of the control valve for the water flow rate of the copper plate 20 in the crystallizer is 100%, the water flow rate at the water supply end is the same as that at the water supply end 10, the pipeline pressure is 16.5bar, and there is no pressure buildup.

[0035] When the thickness of the copper plate 20 in the crystallizer is reduced to 44mm, the water flow rate of the copper plate 20 in the crystallizer is 7650L / min. At this time, the valve opening of the control valve for the water flow rate of the copper plate 20 in the crystallizer is 90%. At this time, there is a situation where the water flow rate at the water-using end is less than the water flow rate at the water-supplying end. The pipeline pressure of the inlet pipe 30 is 17bar, and there is a pressure buildup in the inlet pipe 30. Therefore, by adjusting the regulating valve 51 of the bypass pipe 50, the water flow rate of the bypass pipe 50 is adjusted to 850L / min, which can balance the supply and demand and make the pressure of the inlet pipe reach the target set value, that is, below the safe pressure value.

[0036] In some embodiments, the regulating valve 51 is adjusted in multiple steps. When the flow rate change in the bypass pipe 50 needs to be adjusted significantly, a single adjustment would result in drastic fluctuations in water flow, affecting production stability. Therefore, the inventors adopted a method of adjusting the regulating valve 51 in multiple steps, which significantly reduces the fluctuation of water flow during the adjustment process.

[0037] In some implementations, when the control is performed in a multi-adjustment manner, the water pressure change in the inlet pipe 30 is controlled to be within any parameter between 2% and 5% of the initial operating pressure value during each adjustment. For example, each adjustment of the regulating valve 51 ensures that the water pressure change in the inlet pipe 30 is controlled to be 2% of the initial operating pressure value of the inlet pipe 30. The initial operating pressure value of the inlet pipe 30 refers to the pipe pressure within the inlet pipe 30 when the copper plate 20 is at its initial thickness during the operation of the crystallizer water cooling system.

[0038] In some implementations, a sampling method is used to obtain the real-time value of the thickness of the copper plate 20 and determine whether the regulating valve 51 needs to be adjusted. When adjusting the regulating valve 51 based on the real-time value of the thickness of the copper plate 20 using the solution of this application, it is not necessary to monitor it continuously; a test can be performed after a preset running time.

[0039] For information on the crystallizer water cooling system, please refer to [link / reference]. Figure 1 The positions of the measuring instruments and regulating valves 51 in the pipeline can be further defined. In some embodiments, the flow meter 32 on the inlet pipe 30 is relatively close to the water supply end 10. In some embodiments, the pressure gauge 31 on the inlet pipe 30 is relatively close to the crystallizer. In some embodiments, the bypass pipe 50 is equipped with two regulating valves 51, one of which serves as a backup. In some embodiments, on the bypass pipe 50, the two regulating valves 51 are respectively close to the inlet pipe 30 and the return pipe 40.

[0040] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0041] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0042] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A method for controlling water cooling in a crystallizer, characterized in that, A crystallizer water cooling system is applied, the crystallizer water cooling system comprising: Water supply end; A water inlet pipe is connected between the water outlet of the water supply end and the water channel inlet of the copper plate of the crystallizer, and a pressure gauge is installed in the water inlet pipe; A return water pipe is connected between the return water inlet of the water supply end and the water outlet of the copper plate of the crystallizer; A bypass pipe is connected between the inlet pipe and the return pipe, and the bypass pipe is equipped with a regulating valve; The crystallizer water cooling control method includes: Obtain the reading of the pressure gauge and determine whether there is pressure buildup in the water inlet pipe based on the reading; When there is pressure buildup in the water inlet pipe, the real-time value of the thickness of the copper plate is obtained, and the regulating valve is adjusted according to the real-time value of the thickness to relieve the pressure buildup in the water inlet pipe.

2. The crystallizer water cooling control method as described in claim 1, characterized in that, The copper plate of the crystallizer has an initial thickness value; During the process of regulating the valve based on the real-time value of the thickness, the regulating valve is also regulated based on the difference between the real-time value of the thickness and the initial value of the thickness.

3. The crystallizer water cooling control method as described in claim 2, characterized in that, The regulating valve is adjusted according to the rule that the water flow rate of the crystallizer decreases by 10% for every 1mm decrease in the thickness of the copper plate of the crystallizer. The water inlet pipe is equipped with a flow meter.

4. The crystallizer water cooling control method as described in claim 3, characterized in that, When adjusting the regulating valve, the adjustment is performed in multiple steps.

5. The crystallizer water cooling control method as described in claim 4, characterized in that, When adjusting the system in multiple steps, the water pressure change in the inlet pipe is controlled to be within any parameter between 2% and 5% of the initial operating pressure value during each adjustment.

6. The crystallizer water cooling control method as described in claim 1, characterized in that, The thickness of the copper plate is obtained in real time by random sampling, and it is determined whether the regulating valve needs to be adjusted.

7. The crystallizer water cooling control method as described in claim 3, characterized in that, The flow meter is located relatively close to the water supply end on the water inlet pipe.

8. The crystallizer water cooling control method as described in claim 5, characterized in that, The pressure gauge on the water inlet pipe is located relatively close to the crystallizer.

9. The crystallizer water cooling control method as described in claim 1, characterized in that, The bypass pipe is equipped with two regulating valves.

10. The crystallizer water cooling control method as described in claim 9, characterized in that, On the bypass pipe, the two regulating valves are located near the inlet pipe and the return pipe, respectively.

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