Slab cooling device and heating furnace in front of the furnace

Abstract

This disclosure relates to the field of metallurgical technology, and more particularly to a slab cooling device and a heating furnace in front of the furnace. The disclosure provides a slab cooling device in front of the furnace, including a cooling mechanism, a detection mechanism, and a cleaning mechanism. The cooling mechanism includes an upper cooling manifold and a lower cooling manifold, with a slab cooling space between them. The detection mechanism includes a first temperature sensor and a second temperature sensor. The first temperature sensor is located at the inlet of the slab cooling space, and the second temperature sensor is located at the outlet of the slab cooling space. The cleaning mechanism is located between the outlet of the slab cooling space and the second temperature sensor, and is used to blow away residues after slab cooling. This disclosure enables a rapid drop in slab surface temperature, completing the ferrite or bainite phase transformation, significantly reducing slab cooling time and improving production efficiency.

Description

Technical Field

[0001] This disclosure relates to the field of metallurgical technology, and in particular to a slab cooling device for a heating furnace and a heating furnace. Background Technology

[0002] In the hot rolling process, the energy consumption of the heating furnace accounts for more than 60%. Steel companies at home and abroad regard the hot charging process of slabs as an important technical measure to reduce the energy consumption of hot rolling. Hot charging of slabs mainly utilizes the waste heat of the slab, reduces the consumption of gas in the heating furnace and shortens the time in the furnace. While reducing energy consumption, it also reduces the oxidation loss of the slab, and improves the yield and production efficiency.

[0003] The higher the slab charging temperature, the lower the furnace energy consumption. In actual industrial production, due to production scheduling reasons, not all slabs can be charged to the furnace at high temperatures. For peritectic steel and steels with added microalloying elements such as Nb, V, and Ti, when the slab surface temperature is in the two-phase region during charging, the slab surface structure consists of austenite and ferrite phases, with ferrite precipitating at the austenite grain boundaries and having small grain size, while the austenite grain size is larger. When the slab enters the furnace and is reheated to above Ar3 temperature, the precipitated ferrite is austenitized again, but the formed austenite grains are fine, and the original austenite grains further grow, forming a mixed-grain structure. This mixed-grain structure has high crack sensitivity, and cracks easily appear on the slab surface during rolling, i.e., hot-charge cracks. For slabs with added microalloying elements such as Nb, V, and Ti, as the slab temperature decreases before entering the furnace, the number of precipitated phases increases, and these precipitates easily precipitate at grain boundaries, resulting in a decrease in grain boundary strength. After the slab re-enters the heating furnace, it is difficult for all the Nb, V, and Ti precipitates to be completely dissolved. The undissolved precipitates continue to grow at the grain boundaries, where stress concentration is likely to occur, and cracks are also likely to appear on the slab surface during the rolling process. Utility Model Content

[0004] This disclosure aims to address at least one of the technical problems existing in the prior art or related technologies.

[0005] Therefore, in a first aspect of this disclosure, a slab cooling device for a heating furnace is provided, comprising a cooling mechanism, a detection mechanism, and a cleaning mechanism. The cooling mechanism includes an upper cooling manifold and a lower cooling manifold, with a slab cooling space between the upper cooling manifold and the lower cooling manifold.

[0006] The detection mechanism includes a first temperature detection element and a second temperature detection element. The first temperature detection element is disposed at the inlet of the slab cooling space, and the second temperature detection element is disposed at the outlet of the slab cooling space.

[0007] The cleaning mechanism is located between the outlet of the slab cooling space and the second temperature detection element, and the cleaning mechanism is used to blow away the residual water after the slab is cooled.

[0008] In one feasible implementation, the upper cooling manifold and the lower cooling manifold are provided with a plurality of nozzles along the width direction of the slab, the nozzles are arranged in multiple rows and the nozzles are staggered.

[0009] In one feasible implementation, the nozzles are arranged in two rows.

[0010] In one feasible implementation, the upper cooling manifold and the lower cooling manifold are provided with four rows of cooling manifolds along the extension direction of the slab, and the four rows of cooling manifolds are spaced apart.

[0011] In one feasible implementation, the cooling manifold is independently controlled to open and close.

[0012] In one feasible implementation, the nozzle water pressure of the upper cooling manifold and the lower cooling manifold is set to 0.5MPa to 1.0MPa, and the cooling rate is ≥10℃ / second.

[0013] In one feasible implementation, the cleaning mechanism includes a spray beam and a nozzle, the nozzle being connected to the spray beam, and the nozzle facing the slab surface forming an angle with the slab.

[0014] In one feasible implementation, an adjusting member is also included, wherein the nozzle is connected to the spray beam via the adjusting member, and the adjusting member is used to adjust the angle of the nozzle toward the slab.

[0015] In one feasible implementation, the initial cooling temperature of the slab is ≤Ar3, and the final cooling temperature of the slab is ≤Ar1.

[0016] A second aspect of this disclosure provides a heating furnace, including the aforementioned furnace front slab cooling device.

[0017] Compared to existing technologies, this disclosure offers at least the following advantages: The slab conveyor rollers placed in front of the heating furnace enable rapid cooling of the slab. The slab temperature is measured by a first temperature sensor at the inlet. When the slab temperature is between Ar1 and Ar3, the cooling mechanism cools the slab. Based on the temperature measured by the first temperature sensor, the pressure of the cooling mechanism nozzles and the number of dense cooling manifolds are adjusted to achieve rapid cooling to below Ar1, ensuring rapid furnace entry of the slab. A cleaning mechanism is used to blow away residual water after slab cooling, ensuring the accuracy of the second temperature sensor measurement. This disclosure avoids the need to install cooling equipment on multiple casting machines, resulting in lower investment costs, significantly reducing slab cooling time, improving production efficiency, and preventing mixed-crystal structures in the continuously cast slab between Ar1 and Ar3 temperatures. Rapid cooling also suppresses the precipitation of carbonitrides at grain boundaries, refines the surface structure of the continuously cast slab, resulting in a finer and more uniform structure, improves the thermoplasticity of the slab surface, and prevents the occurrence of hot-dip cracking. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0019] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of exemplary embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0021] Figure 1 This is a schematic diagram of the structure of the cooling slab blank disclosed in this invention;

[0022] Figure 2 This is a schematic diagram of the structure of the uncooled slab disclosed in this invention;

[0023] Figure 3 This is a schematic diagram of the nozzle arrangement in the cooling manifold of this disclosure.

[0024] in, Figures 1 to 3 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0025] 100 - Slab; 200 - Heating furnace;

[0026] 1-Cooling mechanism; 11-Upper cooling manifold; 12-Lower cooling manifold; 13-Nozzle; 14-Cooling manifold; 2-Detection mechanism; 21-First temperature detection element; 22-Second temperature detection element; 3-Cleaning mechanism; 31-Spray beam; 32-Spray head. Detailed Implementation

[0027] To better understand the above-mentioned objectives, features, and advantages of this disclosure, the solutions disclosed herein will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0028] Numerous specific details are set forth in the following description in order to provide a full understanding of this disclosure, but this disclosure may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some, and not all, of the embodiments of this disclosure.

[0029] Currently, the higher the hot charging temperature of the slab, the lower the energy consumption of the heating furnace. In actual industrial production, due to production scheduling reasons, not all slabs can be charged to the furnace at high temperatures. For peritectic steel and steels with added microalloying elements such as Nb, V, and Ti, when the slab surface temperature is in the two-phase region during charging, the surface microstructure of the slab consists of austenite and ferrite phases, with ferrite precipitating at the austenite grain boundaries and having small grain size, while the austenite grain size is larger. When the slab enters the heating furnace and is reheated to above Ar3 temperature, the precipitated ferrite is austenitized again, but the formed austenite grains are fine, and the original austenite grains further grow, forming a mixed-grain structure. This mixed-grain structure has high crack sensitivity, and cracks easily appear on the surface of the slab during rolling, i.e., hot-charge cracks. For slabs with added microalloying elements such as Nb, V, and Ti, as the slab temperature decreases before entering the furnace, the number of precipitated phases increases, and the precipitated phases easily precipitate at the grain boundaries, resulting in a decrease in grain boundary strength. After the slab re-enters the heating furnace, it is difficult for all the Nb, V, and Ti precipitates to be completely dissolved. The undissolved precipitates continue to grow at the grain boundaries, where stress concentration is likely to occur, and cracks are also likely to appear on the slab surface during the rolling process.

[0030] To address the red-hot charging cracking defect in slabs, current technologies primarily involve either slow cooling of the slab to below Ar1 temperature or adding cooling equipment at the casting machine exit to rapidly cool the slab from above 900℃ to Ar1. The former method has low production efficiency and cannot precisely control the slab temperature after slow cooling, resulting in a lower slab charging temperature and increased furnace energy consumption. While the latter method is more efficient, it requires adding cooling equipment to each casting machine, leading to higher costs. Furthermore, the high initial cooling temperature of the slab results in high internal stress after cooling, making it prone to bending or warping, affecting slab quality. Additionally, if the slab is not promptly charged into the furnace after cooling to Ar1 temperature, its temperature will further decrease, resulting in significant heat loss and high furnace energy consumption.

[0031] Based on this, this disclosure provides a slab cooling device for a heating furnace. This device is placed on the slab conveyor rollers in front of the heating furnace, enabling rapid cooling of the slab. The slab temperature is measured by a first temperature sensor at the inlet. When the slab temperature is between Ar1 and Ar3, the cooling mechanism cools the slab. Based on the temperature measured by the first temperature sensor, the pressure of the nozzles and the number of dense cooling manifolds in the cooling mechanism are adjusted to achieve rapid cooling to below Ar1, ensuring the slab enters the furnace quickly. This disclosure avoids the need to install cooling equipment on multiple casting machines, resulting in lower investment costs, significantly reducing slab cooling time, improving production efficiency, and preventing mixed-grain structures in continuously cast slabs between Ar1 and Ar3 temperatures. Rapid cooling also suppresses the precipitation of carbonitrides at grain boundaries, refines the surface structure of the continuously cast slab, resulting in a finer and more uniform structure, improving the thermoplasticity of the slab surface, and preventing hot-dip cracking.

[0032] The following detailed description uses specific embodiments to illustrate the furnace front slab cooling device for this heating furnace:

[0033] Reference Figures 1 to 3 As shown, a first aspect of this disclosure provides a slab cooling device for a heating furnace, including a cooling mechanism 1, a detection mechanism 2, and a cleaning mechanism 3. The cooling mechanism 1 includes an upper cooling manifold 11 and a lower cooling manifold 12, with a slab 100 cooling space between the upper cooling manifold 11 and the lower cooling manifold 12. The detection mechanism 2 includes a first temperature detection element 21 and a second temperature detection element 22. The first temperature detection element 21 is disposed at the inlet of the slab 100 cooling space, and the second temperature detection element 22 is disposed at the outlet of the slab 100 cooling space. The cleaning mechanism 3 is disposed between the outlet of the slab 100 cooling space and the second temperature detection element 22, and the cleaning mechanism 3 is used to blow away residual water after the slab 100 has cooled.

[0034] The slab conveyor rollers placed in front of the heating furnace 200 can achieve rapid cooling of the slab 100. The temperature of the slab 100 is tested by the first temperature detector 21 at the inlet. When the temperature of the slab 100 is between Ar1 and Ar3, the cooling mechanism 1 cools the slab 100. Based on the temperature tested by the first temperature detector 21, the pressure of the nozzle 13 of the cooling mechanism 1 and the number of dense cooling manifolds 14 are adjusted to achieve rapid cooling to below Ar1, ensuring that the slab 100 enters the furnace quickly. The cleaning mechanism 3 is used to blow away the residual water after the slab 100 is cooled to ensure the accuracy of the measurement by the second temperature detector 22. This disclosure avoids the need to install cooling equipment on multiple casting machines, resulting in lower investment costs. It significantly reduces the slab cooling time by 100°C, improves production efficiency, and prevents the formation of mixed-grain structures in the continuously cast slab between Ar1 and Ar3 temperatures. Rapid cooling also suppresses the precipitation of carbonitrides at grain boundaries, refines the surface structure of the continuously cast slab, resulting in a finer and more uniform structure, improves the thermoplasticity of the slab surface, and prevents the occurrence of hot-dip cracking.

[0035] Specifically, the first temperature detection element 21 and the second temperature detection element 22 of this disclosure can be selected from contact temperature detection devices, such as embedded thermocouples, which measure temperature by directly contacting the surface of the slab or embedding it inside the slab 100 using the thermoelectric effect. Embedded thermocouples have high accuracy (±1~2℃), can work stably for a long time, and have strong resistance to electromagnetic interference; or resistance temperature detectors (RTDs), which measure temperature by utilizing the characteristics of platinum resistance changing with temperature. Alternatively, non-contact temperature detection devices, such as thermometers (single-point / array type), can be selected by receiving infrared energy radiated from the surface of the slab to calculate the temperature; dual-color or multi-color infrared thermometry, which reduces the interference of surface oxide scale and water mist on emissivity and is more suitable for the water-rich environment of the cooling zone of this disclosure; or array-type infrared thermal imagers, which generate temperature field distribution in the width direction of the slab, identify local temperature anomalies, and have millisecond-level response, making them suitable for dynamic phase change detection (the latent heat change accompanied by Ar1 / Ar3 can be quickly captured), and are non-contact installed and easy to maintain. Specifically, the testing organization disclosed herein can be configured such that the first temperature detection element 21 is an array-type infrared thermal imager to monitor the overall temperature distribution of the slab and identify low-temperature areas that do not reach Ar3; the second temperature detection element 22 is a dual-color infrared thermometer + embedded thermocouple, which can perform redundant verification to ensure that the final cooling temperature is ≤ Ar1.

[0036] In some embodiments, the upper cooling manifold 11 and the lower cooling manifold 12 are provided with a plurality of nozzles 13 along the width direction of the slab 100, the nozzles 13 are arranged in multiple rows and are staggered.

[0037] In this embodiment, the upper cooling manifold 11 and the lower cooling manifold 12 of this disclosure are provided with a plurality of nozzles 13 along the width direction of the slab 100. The nozzles 13 are staggered along the width direction of the slab 100 to ensure that the cooling water coverage is without dead corners and to ensure uniform cooling performance in the width direction of the slab. Specifically, the nozzles 13 of this disclosure are arranged in two rows.

[0038] In some embodiments, the upper cooling manifold 11 and the lower cooling manifold 12 are provided with four rows of cooling manifolds 14 along the extending direction of the slab 100, and the four rows of cooling manifolds 14 are spaced apart.

[0039] In this embodiment, the number of rows of cooling manifolds along the length direction can be determined based on the distance from the slab conveying rollers to the heating furnace. Specifically, four rows of cooling manifolds 14 are arranged along the extension direction of the slab 100. Furthermore, the cooling manifolds 14 are independently controlled to open and close, adapting to different cooling requirements by opening and closing in different areas, and adjusting the cooling intensity of each section in real time according to the slab temperature.

[0040] In some embodiments, the water pressure of the nozzles 13 of the upper cooling manifold 11 and the lower cooling manifold 12 is set to 0.5 MPa to 1.0 MPa, and the cooling rate is ≥10 °C / second.

[0041] In this embodiment, setting the water pressure of nozzle 13 to above 0.5 MPa ensures that the nozzle forms sufficiently fine water mist particles, enhancing the contact area with the slab surface. Combined with high-pressure spraying, it effectively covers high-temperature areas and rapidly absorbs heat, avoiding stress concentration or deformation caused by uneven local cooling. This water pressure range is lower than the operating pressure of the safety valve in the fine water mist system (typically 1.15 times the maximum pressure), maintaining system stability while preventing overpressure risks. It also meets the lower pressure limit requirement (0.15 MPa) for low-pressure fire hydrants in fire protection systems, ensuring long-term reliable operation of the equipment. A cooling rate ≥10℃ / second can rapidly remove heat, achieving the transformation of austenite into a fine-grained structure and reducing internal defects in the slab (such as microcracks). The impact force of the high-pressure water mist can also break the surface vapor film, improving heat exchange efficiency.

[0042] In some embodiments, the cleaning mechanism 3 includes a spray beam 31 and a nozzle 32, the nozzle 32 being connected to the spray beam 31, and the nozzle 32 facing the plate surface of the slab 100 forming an angle with the slab 100.

[0043] In this embodiment, the nozzle 32 of this disclosure forms an angle with the surface of the slab 100. By spraying at a non-perpendicular angle, the tangential component of the impact force after decomposition can be increased by utilizing the hydrodynamic effect, thus more effectively breaking down the residues adhering to the slab surface. The angled design allows the sprayed medium (such as a water column or airflow) to form a fan-shaped diffusion, covering a larger area in a single action, reducing the number of reciprocating movements of the equipment, significantly improving spatial coverage efficiency, and the fluid shear force generated by the inclined spray can guide the debris to flow in a specific direction, preventing secondary deposition, reducing local pressure concentration caused by direct spraying, and avoiding premature damage to the nozzle.

[0044] In some embodiments, an adjusting member 33 is also included, and the nozzle 32 is connected to the spray beam 31 through the adjusting member 33. The adjusting member 33 is used to adjust the angle of the nozzle 32 toward the slab 100.

[0045] In this embodiment, the nozzle 32 is connected to the spray beam 31 via an adjusting member 33. The adjusting member 33 is used to adjust the angle of the nozzle 32 toward the slab 100, so that the spray angle of the nozzle 32 can be adjusted to adapt to various models and types of slabs 100. Specifically, the adjusting member can be a rotating shaft or an electric turntable, etc.

[0046] In some embodiments, the initial cooling temperature of the slab 100 is ≤Ar3, and the final cooling temperature of the slab 100 is ≤Ar1.

[0047] In this embodiment, when the initial cooling temperature is higher than Ar3, the microstructure is a single-phase austenitic structure, which is uniform and can be directly fed into the furnace without the need for pre-furnace cooling equipment. Ar3 temperature is the starting temperature point for the transformation from austenite to ferrite. When the slab temperature is ≤ Ar3, the microstructure is in the two-phase region of austenite and ferrite. Using a rapid slab cooling device, the slab is rapidly cooled to below Ar1 temperature (the end temperature of the transformation from austenite to ferrite). This reduces the slab's residence time in the two-phase region, refining the grain size; and it also suppresses the precipitation of carbonitrides at grain boundaries, improving grain boundary strength. Both of these effects improve the surface thermoplasticity of the slab and prevent red-hot cracking after the slab enters the furnace. By precisely controlling the Ar1 temperature, excessively low cooling temperatures are avoided, allowing for effective slab preheating and reducing slab burn-off and furnace energy consumption.

[0048] The specific embodiments and solutions disclosed herein are as follows:

[0049] Example 1:

[0050] The cooling manifold 14 consists of 4 rows with a spacing of 450 mm between each row. The slab 100 has a thickness of 238 mm, a width of 1500 mm, a length of 10 m, and is made of Q345B steel. The Ar1 and Ar3 temperatures are 669℃ and 790℃, respectively. The inlet temperature of the slab 100 is 750℃. The cooling manifold 14 has 3 rows open. The nozzle 13 has a pressure of 0.5 MPa and an outlet temperature of 600℃.

[0051] Example 2:

[0052] The cooling manifold 14 consists of 4 rows with a spacing of 450 mm between each row. The slab 100 has a thickness of 238 mm, a width of 1800 mm, a length of 9 m, and is made of Q345B steel. The Ar1 and Ar3 temperatures are 669℃ and 790℃, respectively. The inlet temperature of the slab 100 is 700℃. Two rows of cooling manifold 14 are open. The nozzle 13 has a pressure of 0.7 MPa and an outlet temperature of 580℃.

[0053] Example 3:

[0054] The cooling manifold has 4 rows, with a spacing of 450mm between each row. The slab 100 has a thickness of 238mm, a width of 1600mm, a length of 11m, and uses 610L steel. The Ar1 and Ar3 temperatures are 655℃ and 810℃, respectively. The inlet temperature of the slab 100 is 780℃. The cooling manifold 14 has 4 rows open, the nozzle 13 has a pressure of 0.9MPa, and an outlet temperature of 580℃.

[0055] Example 4:

[0056] The cooling manifold 14 consists of 4 rows with a spacing of 450 mm between each row. The slab 100 has a thickness of 238 mm, a width of 1600 mm, a length of 11 m, and is made of 590DP steel. The Ar1 and Ar3 temperatures are 635℃ and 800℃, respectively. The inlet temperature of the slab 100 is 700℃. Two rows of cooling manifold 14 are open. The nozzle 13 has a pressure of 0.9 MPa and an outlet temperature of 550℃.

[0057] Example 5:

[0058] The cooling manifold 14 consists of 5 rows with a spacing of 400 mm between each row. The slab 100 has a thickness of 220 mm, a width of 1500 mm, a length of 10 m, and uses 610L steel. The Ar1 and Ar3 temperatures are 655℃ and 810℃, respectively. The inlet temperature of the slab 100 is 750℃. The cooling manifold 14 has 4 rows open. The nozzle 13 has a pressure of 0.5 MPa and an outlet temperature of 600℃.

[0059] A second aspect of this disclosure provides a heating furnace, including the furnace front slab cooling device provided in the first aspect of this disclosure.

[0060] In this disclosure, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise expressly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0061] In the description of this disclosure, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0062] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0063] The above are merely preferred embodiments of this disclosure and are not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A slab cooling device for a heating furnace, characterized in that, The system includes a cooling mechanism, a detection mechanism, and a cleaning mechanism. The cooling mechanism comprises an upper cooling manifold and a lower cooling manifold, with a slab cooling space between the upper and lower cooling manifolds. The detection mechanism includes a first temperature detection element and a second temperature detection element. The first temperature detection element is disposed at the inlet of the slab cooling space, and the second temperature detection element is disposed at the outlet of the slab cooling space. The cleaning mechanism is located between the outlet of the slab cooling space and the second temperature detection element, and the cleaning mechanism is used to blow away the residual water after the slab is cooled.

2. The reheating furnace front slab cooling device according to claim 1, characterized by The upper cooling manifold and the lower cooling manifold are provided with multiple nozzles along the width direction of the slab. The nozzles are arranged in multiple rows and are staggered.

3. The reheating furnace front slab cooling device according to claim 2, characterized by The nozzles are configured in two rows.

4. The reheating furnace front slab cooling device according to claim 1, characterized by The upper cooling manifold and the lower cooling manifold are provided with four rows of cooling manifolds along the extension direction of the slab, and the four rows of cooling manifolds are spaced apart.

5. The reheating furnace front slab cooling device according to claim 4, characterized by The cooling manifold is independently controlled to open and close.

6. The reheating furnace front slab cooling device according to claim 1, characterized by The nozzle water pressure of the upper cooling manifold and the lower cooling manifold is set to 0.5MPa to 1.0MPa, and the cooling rate is ≥10℃ / second.

7. The furnace front slab cooling device according to claim 1, characterized in that, The cleaning mechanism includes a spray beam and a nozzle, the nozzle being connected to the spray beam, and the surface of the nozzle facing the slab forming an angle with the slab.

8. The reheating furnace front slab cooling device according to claim 7, characterized by It also includes an adjusting component, through which the nozzle is connected to the spray beam, and the adjusting component is used to adjust the angle of the nozzle toward the slab.

9. The reheating furnace front slab cooling device according to claim 1, characterized by The initial cooling temperature of the slab is ≤Ar3, and the final cooling temperature of the slab is ≤Ar1.

10. A heating furnace characterized by comprising: The furnace front slab cooling device includes any one of claims 1 to 9.

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