Closed-circuit water cooling system of super-thick slab continuous casting equipment and control method of closed-circuit water cooling system

Abstract

The invention discloses a closed-loop water cooling system of super-thick slab continuous casting equipment and a control method of the closed-loop water cooling system, and relates to the technical field of steel-making continuous casting, the closed-loop water cooling system of the super-thick slab continuous casting equipment comprises a continuous casting equipment waterway, a plurality of water cooling pipelines and a plurality of water cooling pipelines, the sub-waterway flows through the continuous casting equipment sub-component so as to cool the continuous casting equipment sub-component; the water storage unit is used for storing first cooling water of which the hardness meets a preset requirement; a drive pump; the heat exchanger is provided with a first flow channel and a second flow channel; the first flow channel of the heat exchanger, the continuous casting equipment water channel, the driving pump and the water storage unit form a circulating water channel; and the second flow channel is used for introducing second cooling water, so that the second cooling water takes away the heat of the first cooling water. Scaling in the equipment can be effectively avoided, so that the service life of the equipment is prolonged, and the accident rate is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of steelmaking and continuous casting, and in particular to a closed-circuit water cooling system for ultra-thick slab continuous casting equipment and a control method thereof. Background Art

[0002] With the development of steel enterprises, production capacity is increasing, competition is becoming more and more fierce, and there is a need to reduce production costs and improve productivity. The working state of continuous casting equipment is particularly critical. The equipment from the crystallizer to the roller of continuous casting is all cooled by water to ensure the temperature and life of key components on the equipment. Since the equipment is irradiated by high-temperature billets for a long time, the cooling water will scale in the equipment channel after a long time. After scaling, the cooling water flow rate in the channel slows down, and the temperature of the equipment rises, which further accelerates scaling in the channel, and finally blocks the channel, causing damage to the equipment. Especially for ultra-thick slab continuous casting machines, due to the small amount of secondary cooling spray water, the large cross-section of the billet, the large heat radiation area, the large heating area of ​​the equipment, the heavy-load structure of the equipment body, and the high cost, if the equipment is damaged due to cooling problems, it will cause great economic losses and affect production. In response to the above problems, a new water cooling system is urgently needed to solve the above problems. Summary of the Invention

[0003] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the embodiments of the present invention is to provide a closed-circuit water cooling system for ultra-thick slab continuous casting equipment and a control method thereof, which can effectively avoid scaling inside the equipment, thereby increasing the equipment life and reducing the accident rate.

[0004] The specific technical solution of the embodiment of the present invention is:

[0005] A closed-circuit water cooling system for ultra-thick slab continuous casting equipment, comprising:

[0006] a continuous casting equipment water channel, comprising a plurality of sub-water channels connected in parallel, wherein the sub-water channels flow through the sub-components of the continuous casting equipment to cool the sub-components of the continuous casting equipment;

[0007] A water storage unit, the water storage unit being used to store first cooling water having a hardness that meets a preset requirement;

[0008] Drive pump;

[0009] A heat exchanger having a first flow channel and a second flow channel, wherein the first flow channel of the heat exchanger, the continuous casting equipment water channel, the driving pump and the water storage unit form a circulating water channel;

[0010] The second flow channel is used to allow second cooling water to flow in, so that the second cooling water removes heat from the first cooling water.

[0011] Preferably, the sub-waterway includes: a first on-off valve arranged upstream of the continuous casting equipment sub-component; a first pressure measuring unit arranged upstream of the continuous casting equipment sub-component; a second on-off valve arranged downstream of the continuous casting equipment sub-component; a first temperature measuring unit arranged downstream of the continuous casting equipment sub-component; and a first flow measuring unit arranged on the sub-waterway.

[0012] Preferably, the closed-circuit water cooling system of the ultra-thick slab continuous casting equipment includes:

[0013] A filter unit is arranged between the inlet of the water channel of the continuous casting equipment and the water storage unit; the filter unit includes: a filter water channel and a bypass water channel with a filter connected in parallel, the filter water channel is provided with a third on-off valve and a fourth on-off valve located upstream and downstream of the filter respectively, and the bypass water channel is provided with a fifth on-off valve.

[0014] Preferably, the closed-circuit water cooling system of the ultra-thick slab continuous casting equipment includes:

[0015] A drive unit is arranged on the circulating water circuit, and the drive unit includes: parallel drive water circuits, each of which has the drive pump, a tenth on-off valve located upstream of the drive pump, a check valve located downstream of the drive pump, and a pressure transmitter located downstream of the drive pump.

[0016] Preferably, the water storage unit stores first cooling water whose hardness meets a preset requirement, the preset requirement being that the total hardness of the first cooling water is 0, and the first cooling water is pure water.

[0017] Preferably, the water storage unit is located downstream of the first flow channel and upstream of the water channel of the continuous casting equipment; a second temperature measuring unit is provided between the first flow channel and the water storage unit.

[0018] Preferably, a third temperature measuring unit and a sixth on-off valve are provided between the inlet of the first flow channel and the outlet of the water channel of the continuous casting equipment; a seventh on-off valve is provided at the outlet of the water storage unit;

[0019] The opening degree of the sixth on-off valve and / or the seventh on-off valve can be adjusted so that the difference between the temperature detected by the third temperature measuring unit and the temperature detected by the second temperature measuring unit is less than or equal to 15 degrees Celsius.

[0020] Preferably, the closed-circuit water cooling system of the ultra-thick slab continuous casting equipment includes:

[0021] a water inlet pipe connected to the inlet of the second flow channel of the heat exchanger, the water inlet pipe being used to communicate with the water treatment cooling unit, and a fourth temperature measuring unit being provided on the water inlet pipe;

[0022] a water return line connected to the outlet of the second flow channel of the heat exchanger, the water return line being used to communicate with the water treatment cooling unit, and a fifth temperature measuring unit being provided on the water return line;

[0023] Wherein, an eighth opening and closing valve is provided on the water inlet pipeline, and / or a ninth opening and closing valve is provided on the water return pipeline.

[0024] Preferably, the opening degree of the eighth on-off valve and / or the ninth on-off valve can be adjusted so that the temperature detected by the second temperature measuring unit is less than or equal to 42 degrees Celsius.

[0025] A control method for a closed-circuit water cooling system of an ultra-thick slab continuous casting equipment as described above, the control method comprising:

[0026] Collecting production parameters of the ultra-thick slab continuous casting equipment during production, wherein the production parameters include: the width of the ultra-thick slab, the casting speed of the ultra-thick slab, the thickness of the ultra-thick slab, and the steel grade of the ultra-thick slab;

[0027] Obtain comprehensive water quantity system based on production parameters;

[0028] Before the closed-circuit water cooling system of the ultra-thick slab continuous casting equipment is put into operation, the flow rates of the relevant sub-water channels are set based on the comprehensive water volume system, thereby adjusting the opening degrees of the first on-off valve and the second on-off valve of each sub-water channel.

[0029] Preferably, the flow rate flowing through the second flow channel is adjusted according to the temperature detected by the second temperature measuring unit, and when the temperature detected by the second temperature measuring unit is greater than 42 degrees Celsius, the opening of the eighth on-off valve and / or the ninth on-off valve is increased;

[0030] The flow rate of the circulating water circuit is adjusted according to the temperature detected by the third temperature measuring unit and the temperature detected by the second temperature measuring unit. When the difference between the temperature detected by the third temperature measuring unit and the temperature detected by the second temperature measuring unit is greater than 15 degrees Celsius, the power and / or number of the driving pumps are increased, and / or the opening degree of the sixth on-off valve and / or the seventh on-off valve is increased.

[0031] Preferably, the control method includes:

[0032] The opening of the first on-off valve and / or the second on-off valve on a certain sub-waterway is adjusted according to the temperature detected by the first temperature measuring unit on the sub-waterway. When the temperature detected by the first temperature measuring unit on a certain sub-waterway is higher than the preset temperature value, the opening of the first on-off valve and / or the second on-off valve on the sub-waterway is increased.

[0033] The technical solution of the present invention has the following significant beneficial effects:

[0034] The closed-circuit water cooling system of the ultra-thick slab continuous casting equipment in this application can use a heat exchanger to cool the water in the circulating water circuit, so that the water in the circulating water circuit can be recycled and used to cool the sub-components flowing through the continuous casting equipment. The water in the circulating water circuit is the first cooling water stored in the water storage unit and has a hardness that meets the preset requirements. This can effectively reduce the possibility of scaling inside the water circuit of the continuous casting equipment, thereby increasing the life of the equipment and reducing the accident rate. In addition, since the water in the circulating water circuit can be recycled, the usage of the first cooling water can be greatly reduced, thereby achieving the purpose of reducing costs.

[0035] With reference to the following description and drawings, specific embodiments of the present invention are disclosed in detail, indicating how the principles of the present invention can be employed. It should be understood that the embodiments of the present invention are not limited in scope thereby. Features described and / or illustrated for one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the various components in the drawings are merely illustrative and are used to help understand the present invention, and are not intended to specifically limit the shapes and proportional dimensions of the various components of the present invention. Those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to specific circumstances under the guidance of the present invention.

[0037] Figure 1 Schematic diagram of the closed-circuit water cooling system of the ultra-thick slab continuous casting equipment in an embodiment of the present invention.

[0038] Reference numerals in the above drawings:

[0039] 1. Heat exchanger; 2. Water storage unit; 21. Liquid level gauge; 22. Seventh on-off valve; 3. Drive unit; 31. Drive waterway; 311. Drive pump; 312. Tenth on-off valve; 313. Check valve; 314. Pressure transmitter; 4. Continuous casting equipment waterway; 41. Sub-waterway; 411. Continuous casting equipment sub-component; 412. First on-off valve; 413. Second on-off valve; 414. First temperature measuring unit; 415. First flow measuring unit; 416. First pressure measuring unit; 5. Filter unit; 51. Filter waterway; 511. Filter; 512, third on-off valve; 513, fourth on-off valve; 52, bypass water channel; 521, fifth on-off valve; 6, second temperature measuring unit; 7, third temperature measuring unit; 8, sixth on-off valve; 9, water inlet pipe; 91, fourth temperature measuring unit; 92, eighth on-off valve; 93, fourth pressure measuring unit; 94, filtering device; 10, return pipe; 101, fifth temperature measuring unit; 102, ninth on-off valve; 103, fifth pressure measuring unit; 11, second pressure measuring unit; 12, third pressure measuring unit. DETAILED DESCRIPTION

[0040] The details of the present invention can be more clearly understood in conjunction with the accompanying drawings and the description of the specific embodiments of the present invention. However, the specific embodiments of the present invention described herein are for illustrative purposes only and are not to be construed as limiting the present invention in any way. Based on the teachings of the present invention, skilled artisans can conceive of any possible variations based on the present invention, all of which should be considered within the scope of the present invention. It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or there can be an intermediate element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there can be an intermediate element. The terms "mounted," "connected," and "connected" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, internal communication between two elements, direct connection, or indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of these terms based on the specific circumstances. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are intended only to describe specific embodiments and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0042] In order to effectively avoid scaling inside the equipment, to increase the equipment life and reduce the accident rate, this application proposes a closed-circuit water cooling system for ultra-thick slab continuous casting equipment. Figure 1 FIG. 1 is a schematic structural diagram of a closed-circuit water cooling system for an ultra-thick slab continuous casting device according to an embodiment of the present invention. Figure 1 As shown, the closed-circuit water cooling system of the ultra-thick slab continuous casting equipment may include: a continuous casting equipment water channel 4, a water storage unit 2, a drive pump 311, and a heat exchanger 1 having a first flow channel and a second flow channel.

[0043] The continuous casting equipment water channel 4 is used to remove heat from the various sub-components within the continuous casting equipment, thereby cooling them. Sub-components within the continuous casting equipment may include, for example, a straightening machine, a continuous caster, a crystallizer, a roller table, or any other sub-component within the continuous casting equipment. Because multiple identical or different components within the continuous casting equipment require cooling, the continuous casting equipment water channel 4 may include multiple sub-channels 41 connected in parallel. Each sub-channel 41 may flow through at least one continuous casting equipment sub-component 411 to cool the sub-component 411.

[0044] The water storage unit 2 is used to store first cooling water whose hardness meets preset requirements. The driving pump 311 is used to generate power to drive the first cooling water in the water storage unit 2 to flow to the continuous casting equipment water channel 4. The first flow channel of the heat exchanger 1, the continuous casting equipment water channel 4, the driving pump 311 and the water storage unit 2 form a circulating water channel. The water storage unit 2 can facilitate the addition of first cooling water to the circulating water channel. For example, the first cooling water can be added to the water storage unit 2 in a barreled manner, or the first cooling water can be processed by the first cooling water preparation device to obtain the first cooling water, and then input into the water storage unit 2.

[0045] Alternatively, the water storage unit 2 can store first cooling water with a hardness that meets preset requirements. The preset requirement is that the total hardness of the first cooling water be 0, and the first cooling water can be purified water. This approach minimizes scaling within the water channel 4 of the continuous casting equipment, thereby extending equipment life and reducing the risk of accidents. The water storage unit 2 can be equipped with a liquid level gauge 21 to ensure timely replenishment of the first cooling water in the water storage unit 2 if it becomes insufficient.

[0046] The second flow channel is used to pass a second cooling water, which removes heat from the first cooling water. The second cooling water can be any type of cooling water, with no specific hardness requirements. This can significantly reduce the cost of the closed-circuit water cooling system of the ultra-thick slab continuous casting equipment.

[0047] In the present application, the closed-circuit water cooling system of the ultra-thick slab continuous casting equipment can utilize a heat exchanger 1 to cool the water in the circulating water circuit, thereby allowing the water in the circulating water circuit to be recycled and used to cool the sub-component 411 of the continuous casting equipment. The water in the circulating water circuit is the first cooling water stored in the water storage unit 2, whose hardness meets the preset requirements. This can effectively reduce the possibility of scaling inside the water circuit 4 of the continuous casting equipment, thereby increasing the life of the equipment and reducing the accident rate. In addition, since the water in the circulating water circuit can be recycled, the usage of the first cooling water can be greatly reduced, thereby achieving the purpose of reducing costs.

[0048] The sub-waterway 41 may include: a first on-off valve 412 arranged upstream of the continuous casting equipment sub-component 411; a first pressure measuring unit 416 arranged upstream of the continuous casting equipment sub-component 411; a second on-off valve 413 arranged downstream of the continuous casting equipment sub-component 411; a first temperature measuring unit 414 arranged downstream of the continuous casting equipment sub-component 411; and a first flow measuring unit 415 arranged on the sub-waterway 41.

[0049] The water pressure of the first cooling water on the sub-waterway 41 can be detected by the first pressure measuring unit 416, so as to understand the pressure conditions at different positions of the entire circulating waterway to prevent leakage problems. The specific temperature of the first cooling water after the continuous casting equipment sub-component 411 flowing through the sub-waterway 41 is heated can be detected by the first temperature measuring unit 414. The specific flow rate of the first cooling water flowing through the continuous casting equipment sub-component 411 of the sub-waterway 41 can be detected by the first flow measuring unit 415. In combination with the first temperature measuring unit 414, the specific flow rate of the continuous casting equipment sub-component 411 flowing through the sub-waterway 41 can be controlled to meet the cooling requirements while avoiding excessive temperature rise of the first cooling water.

[0050] The first on-off valve 412 and the second on-off valve 413 can be used to control whether the first cooling water cools the continuous casting equipment sub-component 411 on the sub-waterway 41. In addition, when the opening degree of the first on-off valve 412 and the second on-off valve 413 can be changed, the first on-off valve 412 and the second on-off valve 413 can be used to control the degree to which the first cooling water cools the continuous casting equipment sub-component 411 on the sub-waterway 41.

[0051] The closed-circuit water cooling system of the ultra-thick slab continuous casting equipment can include a filtration unit 5 disposed between the inlet of the continuous casting equipment waterway 4 and the water storage unit 2. The filtration unit 5 is used to filter the first cooling water flowing through it, for example to remove impurity particles that may have been introduced later. It can also filter the first cooling water in the circulating waterway, thereby maintaining the first cooling water as pure as possible, further reducing its hardness and the likelihood of scaling within the continuous casting equipment waterway 4. For example, the filtration unit 5 can include an RO reverse osmosis membrane filtration unit 5.

[0052] The filtration unit 5 includes a filtration waterway 51 having a filter 511 and a bypass waterway 52 connected in parallel. The filtration waterway 51 is provided with a third on-off valve 512 and a fourth on-off valve 513, respectively located upstream and downstream of the filter 511. The bypass waterway 52 is provided with a fifth on-off valve 521. This structure enables selective filtration. When filtration is required, the third on-off valve 512 and the fourth on-off valve 513 are opened, and the fifth on-off valve 521 is closed. When filtration is not required, the third on-off valve 512 and the fourth on-off valve 513 are closed, and the fifth on-off valve 521 is opened.

[0053] The closed-circuit water cooling system of the ultra-thick slab continuous casting equipment may include: a drive unit 3 disposed on the circulating water circuit. Furthermore, the drive unit 3 may preferably be disposed between the water storage unit 2 and the filter unit 5, thereby providing sufficient pressure for the filter unit 5 to increase the filtration rate of the filter unit 5.

[0054] The drive unit 3 may include: parallel drive water circuits 31, each drive water circuit 31 having a drive pump 311, a tenth on-off valve 312 located upstream of the drive pump 311, a check valve 313 located downstream of the drive pump 311, and a pressure transmitter 314 located downstream of the drive pump 311. When the drive pump 311 on a certain drive water circuit 31 is running, the tenth on-off valve 312 on other drive water circuits 31 can be closed. By adjusting the power and number of the drive pumps 311 turned on, the water flow rate of the circulating water circuit can be effectively adjusted, so that the cooling effect on the continuous casting equipment sub-component 411 meets the requirements. The pressure transmitter 314 located downstream of the drive pump 311 can measure the pressure of the drive water circuit 31 after the drive pump 311 is pressurized, so as to protect the filter 511 and the continuous casting equipment sub-component 411 from excessive pressure.

[0055] As a feasible option, the water storage unit 2 can be located downstream of the first flow channel and upstream of the continuous casting equipment water channel 4. A second temperature measuring unit 6 is provided between the first flow channel and the water storage unit 2. The second temperature measuring unit 6 can be used to know the temperature of the first cooling water after cooling through the first flow channel, thereby evaluating whether the heat exchange rate of the heat exchanger 1 meets the degree to which the first cooling water is heated by the continuous casting equipment sub-component 411, thereby enabling the entire ultra-thick slab continuous casting equipment closed-circuit water cooling system to operate stably for a long time and avoid excessive temperature of the continuous casting equipment sub-component 411. Since a certain amount of first cooling water is stored in the water storage unit 2, if the second temperature measuring unit 6 is provided on the water storage unit 2 or downstream of the water storage unit 2, it cannot accurately measure the temperature of the first cooling water after cooling through the first flow channel.

[0056] A third temperature measuring unit 7 and a sixth on-off valve 8 are provided between the inlet of the first flow channel and the outlet of the continuous casting equipment water channel 4. The third temperature measuring unit 7 measures the temperature of the first cooling water before it passes through the first flow channel and determines the temperature of the mixed first cooling water of different temperatures flowing out of the multiple sub-water channels 41. Combined with the second temperature measuring unit 6, this determines the specific temperature reduction of the first cooling water by the heat exchanger 1 and also provides a rough estimate of the temperature increase of the first cooling water as it passes through the continuous casting equipment water channel 4.

[0057] The outlet of the water storage unit 2 may be provided with a seventh on-off valve 22 to control whether the water in the water storage unit 2 is discharged. When the water storage unit 2 needs to be repaired or cleaned, the seventh on-off valve 22 may be closed to cut off the water storage unit 2 from its downstream waterway.

[0058] As a feasible option, a second pressure measuring unit 11 can be provided between the filtration unit 5 and the continuous casting equipment water channel 4 to measure the pressure on the aggregate water channel upstream of the multiple sub-water channels 41. A third pressure measuring unit 12 can be provided between the continuous casting equipment water channel 4 and the first flow channel of the heat exchanger 1 to measure the pressure on the aggregate water channel downstream of the multiple sub-water channels 41. Furthermore, a fourth pressure measuring unit 93 and a fifth pressure measuring unit 103 can be provided upstream and downstream of the second flow channel of the heat exchanger 1, respectively.

[0059] As a feasible method, a filtering device 94 may be provided upstream of the second flow channel of the heat exchanger 1 to filter impurities in the second cooling water to prevent them from being deposited in the heat exchanger 1 and reducing the heat exchange efficiency.

[0060] Furthermore, the degree of opening of the sixth on-off valve 8 and / or the seventh on-off valve 22 can be adjusted. This approach ensures that the difference between the temperature detected by the third temperature measuring unit 7 and the temperature detected by the second temperature measuring unit 6 is less than or equal to 15 degrees Celsius. This approach prevents the first cooling water from excessively rising in temperature as it flows through the continuous casting equipment waterway 4 due to insufficient water flow in the circulating waterway, which could result in insufficient cooling of the continuous casting equipment sub-component 411 and excessive temperatures in the continuous casting equipment sub-component 411.

[0061] At the same time, by adjusting the opening degree of the sixth on-off valve 8 and / or the seventh on-off valve 22, it is necessary to control the temperature detected by the third temperature measuring unit 7 to be below a temperature between 45 degrees Celsius and 50 degrees Celsius, so that the temperature of the continuous casting equipment sub-component 411 after cooling can be further controlled not to be too high. For example, the temperature detected by the third temperature measuring unit 7 can be controlled below 45 degrees Celsius. When the temperature detected by the third temperature measuring unit 7 exceeds 45 degrees Celsius, it is necessary to increase the flow rate. First, the opening degree of the sixth on-off valve 8 and / or the seventh on-off valve 22 can be increased. If both are already fully opened, it is necessary to further increase the power and / or number of the drive pump 311. When the temperature detected by the third temperature measuring unit 7 is lower than a certain temperature below 45 degrees Celsius (for example, 40 degrees Celsius), the opening degree of the sixth on-off valve 8 and / or the seventh on-off valve 22 can be reduced, or the power and / or number of the drive pump 311 can be reduced.

[0062] Since the continuous casting equipment water channel 4 has multiple sub-water channels 41, the continuous casting equipment sub-components 411 on different sub-water channels 41 are different, or different sub-water channels 41 have different continuous casting equipment, which are heated to different degrees, and therefore may require different degrees of cooling. In this way, the first cooling water flowing through a certain sub-water channel 41A can cool the continuous casting equipment sub-component 411 on the sub-water channel 41 to a temperature that meets the requirements, but the first cooling water flowing through another sub-water channel 41B cannot cool the continuous casting equipment sub-component 411 on the sub-water channel 41 to a temperature that meets the requirements. In this case, it is necessary to increase the opening of the first on-off valve 412 and the second on-off valve 413 on the other sub-water channel 41B, so as to increase the flow rate of the first cooling water flowing through the other sub-water channel 41. If the first on-off valve 412 and the second on-off valve 413 on another sub-waterway 41B have already been opened to their maximum, it is necessary to increase the opening of the sixth on-off valve 8 and / or the seventh on-off valve 22, or increase the power and / or number of the driving pumps 311. Subsequently, the first cooling water previously flowing through a sub-waterway 41A may cool the continuous casting equipment sub-component 411 on that sub-waterway 41 to an excessively low temperature. In this case, it is necessary to reduce the opening of the first on-off valve 412 and the second on-off valve 413 on that sub-waterway 41A.

[0063] The closed-circuit water cooling system of the ultra-thick slab continuous casting equipment may include: an inlet pipe 9 connected to the inlet of the second flow channel of the heat exchanger 1; and a return pipe 10 connected to the outlet of the second flow channel of the heat exchanger 1. The inlet pipe 9 can be used to connect to the water treatment and cooling unit, and a fourth temperature measuring unit 91 is provided on the inlet pipe 9. The return pipe 10 is used to connect to the water treatment and cooling unit, and a fifth temperature measuring unit 101 is provided on the return pipe 10. The water treatment and cooling unit can be any device or area that can cool the second cooling water. For example, the area can be a larger water pool, and the second cooling water can directly dissipate heat and cool down in the water pool. Among them, an eighth on-off valve 92 is provided on the inlet pipe 9, and / or a ninth on-off valve 102 is provided on the return pipe 10.

[0064] Furthermore, the opening of the eighth on-off valve 92 and / or the ninth on-off valve 102 can be adjusted so that the temperature detected by the second temperature measuring unit 6 is less than or equal to 42 degrees Celsius. In other words, by adjusting the flow rate of the second cooling water flowing through the second flow channel, the cooling effect on the first cooling water flowing through the first flow channel is controlled. The cooled first cooling water must reach a temperature of 42 degrees Celsius or below to effectively cool the continuous casting equipment subcomponent 411 on the continuous casting equipment water path 4. Generally speaking, the flow rate of the second cooling water needs to be 1.5 to 2 times the flow rate of the first cooling water to reduce the temperature of the first cooling water to the target requirement.

[0065] By coupling the adjustment of the first on-off valve 412 and the second on-off valve 413, the adjustment of the drive pump 311, the sixth on-off valve 8 and the seventh on-off valve 22, and the eighth on-off valve 92 and the ninth on-off valve 102, it is necessary to simultaneously meet multiple requirements, such as the difference between the temperature detected by the third temperature measuring unit 7 and the temperature detected by the second temperature measuring unit 6 is less than or equal to 15 degrees Celsius, the temperature detected by the third temperature measuring unit 7 is controlled below a temperature between 45 degrees Celsius and 50 degrees Celsius, each sub-water channel 41 needs to cool the continuous casting equipment sub-component 411 on the sub-water channel 41 to a temperature that meets the requirements, and the temperature detected by the second temperature measuring unit 6 is less than or equal to 42 degrees Celsius.

[0066] This application also proposes a control method for a closed-circuit water cooling system of an ultra-thick slab continuous casting equipment, which can be applied to the above-mentioned closed-circuit water cooling system of the ultra-thick slab continuous casting equipment.

[0067] The control method may include the following steps:

[0068] The production parameters of the ultra-thick slab continuous casting equipment are collected during production, and the production parameters include: the width of the ultra-thick slab, the casting speed of the ultra-thick slab, the thickness of the ultra-thick slab and the steel type of the ultra-thick slab.

[0069] In this step, different cooling degrees can be set according to different production conditions of the ultra-thick plate continuous casting equipment to optimize the closed-circuit water cooling system while adapting to the process requirements. There are four main variables that affect the release of heat from the ingot during the production of ultra-thick plates. These four variables are: the width of the ultra-thick plate, the pulling speed of the ultra-thick plate, the thickness of the ultra-thick plate, and the type of steel used for the ultra-thick plate. The width of the ultra-thick plate is generally between 1600mm and 2600mm. When producing wider ultra-thick plate ingots, the heat is relatively high, and an increased amount of cooling water is required. For the type of steel used for ultra-thick plates, low-carbon steel has a small two-phase zone and releases heat quickly, while high-carbon steel has a large two-phase zone and releases heat relatively slowly.

[0070] Obtain comprehensive water volume system based on production parameters.

[0071] In this step, the influence coefficient of the width of the ultra-thick plate can be set to W: W = w / 1600, where w represents the production width of the ultra-thick plate; the influence coefficient of the drawing speed of the ultra-thick plate can be set to V: V = (v / (0.5)) 0.5 , where v represents the production drawing speed of the ultra-thick plate; the thickness influence coefficient of the ultra-thick plate can be set to H: H = (h / 350) ╳ 0.2, where h represents the thickness of the ultra-thick plate; the steel grade influence coefficient of the ultra-thick plate can be set to S: S = 1.07 for low carbon steel; S = 1.0 for medium carbon steel; S = 0.94 for high carbon steel.

[0072] The comprehensive water coefficient K is obtained according to the production parameters of the ultra-thick plate ingot including the width of the ultra-thick plate, the drawing speed of the ultra-thick plate, the thickness of the ultra-thick plate, and the steel type of the ultra-thick plate, wherein K=W╳V╳H╳S.

[0073] Before the closed-circuit water cooling system of the ultra-thick slab continuous casting equipment is put into operation, the flow rate of each relevant sub-water channel 41 is set based on the comprehensive water volume coefficient, thereby adjusting the opening degree of the first on-off valve 412 and the second on-off valve 413 of each sub-water channel 41.

[0074] As a feasible method, the basic flow range of each sub-waterway 41 can be roughly 15 3 / h to 30m 3 The actual flow rate of each sub-waterway 41 can be calculated by multiplying the basic flow rate by the comprehensive water flow coefficient K. The comprehensive water flow rate is the sum of the flow rates of each sub-waterway 41.

[0075] In this step, the flow rate of each sub-waterway is set based on the obtained comprehensive water flow coefficient K. The larger the comprehensive water flow coefficient K, the higher the flow rate of the corresponding sub-waterway, and the greater the degree of opening of the first on-off valve 412 and the second on-off valve 413 in the corresponding sub-waterway. Because each sub-waterway corresponds to a different type of sub-component in the continuous casting equipment, the degree of opening of the first on-off valve 412 and the second on-off valve 413 in different sub-waterways varies. When the sub-components in the continuous casting equipment corresponding to the sub-waterways are of the same type, the degree of opening of the first on-off valve 412 and the second on-off valve 413 in the sub-waterways is essentially the same.

[0076] After the flow rates of the relevant sub-waterways are determined, the flow rate of the circulating waterway can also be determined, thereby adjusting the power and / or number of the driving pumps 311 and the opening degree of the sixth on-off valve 8 and / or the seventh on-off valve 22.

[0077] The flow rates of the various cooling sub-channels 41 can be set according to the different production conditions of the cast billets in different continuous casting equipment. By setting the flow rates of the various cooling sub-channels 41 in the early stages, the number of times the valves need to be adjusted and the pumps 311 need to be driven can be effectively reduced.

[0078] The control method may include the following steps:

[0079] When the closed-circuit water cooling system of the ultra-thick slab continuous casting equipment is running, the flow rate flowing through the second flow channel is adjusted according to the temperature detected by the second temperature measuring unit 6. When the temperature detected by the second temperature measuring unit 6 is greater than 42 degrees Celsius, the opening of the eighth on-off valve 92 and / or the ninth on-off valve 102 is increased.

[0080] The flow rate of the circulating water circuit is adjusted according to the temperature detected by the third temperature measuring unit 7 and the temperature detected by the second temperature measuring unit 6. When the difference between the temperature detected by the third temperature measuring unit 7 and the temperature detected by the second temperature measuring unit 6 is greater than 15 degrees Celsius, the power and / or number of the driving pump 311 are increased, and / or the opening degree of the sixth on-off valve 8 and / or the seventh on-off valve 22 is increased.

[0081] As feasible, the control method may further include the following steps:

[0082] The opening of the first on-off valve 412 and / or the second on-off valve 413 on a certain sub-water channel 41 is adjusted according to the temperature detected by the first temperature measuring unit 414 on the sub-water channel 41. When the temperature detected by the first temperature measuring unit 414 on a certain sub-water channel 41 is higher than the preset temperature value, the opening of the first on-off valve 412 and / or the second on-off valve 413 on the sub-water channel 41 is increased.

[0083] As feasible, the control method may further include the following steps:

[0084] The status of the closed-circuit water cooling system of the ultra-thick slab continuous casting equipment is judged according to the temperature detected by the second temperature measuring unit 6; when the temperature detected by the second temperature measuring unit 6 is less than or equal to 43 degrees Celsius, it is determined that the closed-circuit water cooling system of the ultra-thick slab continuous casting equipment is in a normal production state; when the temperature detected by the second temperature measuring unit 6 is greater than 43 degrees Celsius and less than or equal to 45 degrees Celsius, it is determined that the closed-circuit water cooling system of the ultra-thick slab continuous casting equipment is in a normal production state, and it is necessary to observe it at preset time intervals; when the temperature detected by the second temperature measuring unit 6 is greater than 45 degrees Celsius and less than or equal to 50 degrees Celsius, it is determined that the closed-circuit water cooling system of the ultra-thick slab continuous casting equipment is at risk, and a reminder is given to inspect the closed-circuit water cooling system of the ultra-thick slab continuous casting equipment after completing this production cycle; when the temperature detected by the second temperature measuring unit 6 is greater than 50 degrees Celsius, it is determined that the closed-circuit water cooling system of the ultra-thick slab continuous casting equipment is at serious risk, production should be stopped as soon as possible, and the closed-circuit water cooling system of the ultra-thick slab continuous casting equipment should be inspected. The closed-circuit water cooling system and control method of the ultra-thick slab continuous casting equipment in this application can be used to effectively cool various sub-components of the continuous casting equipment, and can avoid scaling in the circulating water circuit, thereby increasing equipment life, reducing production accidents, reducing production costs, and improving productivity.

[0085] The closed-circuit water cooling system of the ultra-thick slab continuous casting equipment in the present application can set the flow rate of each relevant cooling sub-water channel 41 according to the different conditions of producing cast slabs in different continuous casting equipment; by setting the flow rate of each relevant cooling sub-water channel 41 in the initial stage, the number of times the opening and closing valves and the driving pump 311 are adjusted in the later stage can be effectively reduced.

[0086] Furthermore, by coupling the adjustment of the first on-off valve 412 and the second on-off valve 413, the adjustment of the drive pump 311, the sixth on-off valve 8 and the seventh on-off valve 22, and the eighth on-off valve 92 and the ninth on-off valve 102, it is necessary to simultaneously meet the following requirements: the difference between the temperature detected by the third temperature measuring unit 7 and the temperature detected by the second temperature measuring unit 6 is less than or equal to 15 degrees Celsius, the temperature detected by the third temperature measuring unit 7 is controlled below a temperature between 45 degrees Celsius and 50 degrees Celsius, each sub-water channel 41 needs to cool the continuous casting equipment sub-component 411 on the sub-water channel 41 to a temperature that meets the requirements, and the temperature detected by the second temperature measuring unit 6 is less than or equal to 42 degrees Celsius, so as to ensure that the continuous casting equipment sub-component 411 on each sub-water channel 41 has a good cooling effect, thereby avoiding the problem of excessive temperature caused by poor cooling effect of individual continuous casting equipment sub-components 411.

[0087] All articles and references disclosed, including patent applications and publications, are incorporated herein by reference for all purposes. The term "essentially consisting of..." describing a combination should include the identified elements, ingredients, parts or steps and other elements, ingredients, parts or steps that do not substantially affect the basic novel features of the combination. The use of the terms "comprising" or "including" to describe the combination of elements, ingredients, parts or steps herein also contemplates an embodiment that is essentially composed of these elements, ingredients, parts or steps. By using the term "may", it is intended to illustrate that any attribute described that "may" include is optional. Multiple elements, ingredients, parts or steps can be provided by a single integrated element, ingredient, part or step. Alternatively, a single integrated element, ingredient, part or step can be divided into separate multiple elements, ingredients, parts or steps. The disclosure "one" or "an" used to describe an element, ingredient, part or step is not intended to exclude other elements, ingredients, parts or steps.

[0088] Each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the scope of protection of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A closed-circuit water cooling system for ultra-thick slab continuous casting equipment, characterized in that: The closed-circuit water cooling system of the ultra-thick slab continuous casting equipment comprises: A continuous casting equipment water circuit, comprising a plurality of sub-water circuits connected in parallel, wherein the sub-water circuits flow through sub-components of the continuous casting equipment to cool the sub-components of the continuous casting equipment; A water storage unit, the water storage unit is used to store first cooling water whose hardness meets a preset requirement; Driving pump; A heat exchanger having a first flow channel and a second flow channel, wherein the first flow channel of the heat exchanger, the continuous casting equipment water channel, the driving pump and the water storage unit form a circulating water channel; The second flow channel is used to pass second cooling water so that the second cooling water can remove heat from the first cooling water.

2. The closed-circuit water cooling system for ultra-thick slab continuous casting equipment according to claim 1, characterized in that: The sub-waterway includes: a first on-off valve arranged upstream of the continuous casting equipment sub-component; a second on-off valve arranged downstream of the continuous casting equipment sub-component; a first temperature measuring unit arranged downstream of the continuous casting equipment sub-component; and a first flow measuring unit arranged on the sub-waterway.

3. The closed-circuit water cooling system for ultra-thick slab continuous casting equipment according to claim 1, characterized in that: The closed-circuit water cooling system of the ultra-thick slab continuous casting equipment comprises: A filter unit is arranged between the inlet of the water channel of the continuous casting equipment and the water storage unit; the filter unit includes: a filter water channel and a bypass water channel with a filter in parallel, the filter water channel is provided with a third on-off valve and a fourth on-off valve respectively located upstream and downstream of the filter, and the bypass water channel is provided with a fifth on-off valve.

4. The closed-circuit water cooling system for ultra-thick slab continuous casting equipment according to claim 1, characterized in that: The closed-circuit water cooling system of the ultra-thick slab continuous casting equipment comprises: The driving unit is arranged on the circulating waterway, and the driving unit includes: parallel driving waterways, each of which has the driving pump, a tenth on-off valve located upstream of the driving pump, and a check valve located downstream of the driving pump.

5. The closed-circuit water cooling system for ultra-thick slab continuous casting equipment according to claim 3, characterized in that: The water storage unit stores first cooling water whose hardness meets a preset requirement, wherein the preset requirement is that the total hardness of the first cooling water is 0, and the first cooling water is pure water.

6. The closed-circuit water cooling system for ultra-thick slab continuous casting equipment according to claim 2, characterized in that: The water storage unit is located downstream of the first flow channel and upstream of the water channel of the continuous casting equipment; a second temperature measuring unit is arranged between the first flow channel and the water storage unit.

7. The closed-circuit water cooling system for ultra-thick slab continuous casting equipment according to claim 6, characterized in that: A third temperature measuring unit and a sixth opening and closing valve are provided between the inlet of the first flow channel and the outlet of the water channel of the continuous casting equipment; a seventh opening and closing valve is provided at the outlet of the water storage unit; The opening degree of the sixth on-off valve and / or the seventh on-off valve can be adjusted so that the difference between the temperature detected by the third temperature measuring unit and the temperature detected by the second temperature measuring unit is less than or equal to 15 degrees Celsius.

8. The closed-circuit water cooling system for ultra-thick slab continuous casting equipment according to claim 7, characterized in that: The closed-circuit water cooling system of the ultra-thick slab continuous casting equipment comprises: a water inlet pipeline connected to the inlet of the second flow channel of the heat exchanger, the water inlet pipeline being used to be connected to the water treatment cooling unit, and a fourth temperature measuring unit being arranged on the water inlet pipeline; a water return pipeline connected to the outlet of the second flow channel of the heat exchanger, the water return pipeline being used to be connected to the water treatment cooling unit, and a fifth temperature measuring unit being arranged on the water return pipeline; Wherein, an eighth opening and closing valve is arranged on the water inlet pipeline, and / or a ninth opening and closing valve is arranged on the water return pipeline.

9. The closed-circuit water cooling system for ultra-thick slab continuous casting equipment according to claim 8, characterized in that: The opening degree of the eighth on-off valve and / or the ninth on-off valve can be adjusted so that the temperature detected by the second temperature measuring unit is less than or equal to 42 degrees Celsius.

10. A control method for a closed-circuit water cooling system of an ultra-thick slab continuous casting equipment as claimed in claim 8, characterized in that: The control method comprises: Collecting production parameters of the ultra-thick slab continuous casting equipment during production, wherein the production parameters include: the width of the ultra-thick slab, the casting speed of the ultra-thick slab, the thickness of the ultra-thick slab and the steel type of the ultra-thick slab; Obtain comprehensive water volume system based on production parameters; Before the closed-circuit water cooling system of the ultra-thick slab continuous casting equipment is put into operation, the flow rates of the relevant sub-water channels are set based on the comprehensive water volume system, thereby adjusting the opening degrees of the first on-off valve and the second on-off valve of each sub-water channel.

11. The control method according to claim 10, characterized in that: The control method further includes: adjusting the flow rate flowing through the second flow channel according to the temperature detected by the second temperature measuring unit, and when the temperature detected by the second temperature measuring unit is greater than 42 degrees Celsius, increasing the opening of the eighth on-off valve and / or the ninth on-off valve; The flow rate of the circulating water circuit is adjusted according to the temperature detected by the third temperature measuring unit and the temperature detected by the second temperature measuring unit. When the difference between the temperature detected by the third temperature measuring unit and the temperature detected by the second temperature measuring unit is greater than 15 degrees Celsius, the power and / or quantity of the driving pump are increased, and / or the opening degree of the sixth on-off valve and / or the seventh on-off valve is increased.

12. The control method according to claim 11, characterized in that: The control method comprises: The opening of the first on-off valve and / or the second on-off valve on a certain sub-waterway is adjusted according to the temperature detected by the first temperature measuring unit on the sub-waterway; when the temperature detected by the first temperature measuring unit on a certain sub-waterway is higher than the preset temperature value, the opening of the first on-off valve and / or the second on-off valve on the sub-waterway is increased.

Images