A slag buffer and slag liquid real-time measurement and control system

Abstract

The present invention discloses a slag buffer and slag liquid real-time measurement and control system, comprising a first slag bag and a second slag bag connected to each other, the second slag bag being connected to a granulation bin, a flow control device being provided at the connection between the first slag bag and the second slag bag, and a flow measuring device being provided at the connection between the second slag bag and the granulation bin, the first slag bag and the second slag bag being provided respectively, a safety device for preventing slag overflowing, and a heat supplement unit for controlling the slag temperature to be constant being provided inside the first slag bag and the second slag bag respectively; the safe and stable operation of the system is ensured by monitoring the flow of high-temperature liquid slag from the slag bag to the granulation device.

Description

Technical Field

[0001] The present invention belongs to the technical field of waste heat recovery of high-temperature liquid slag, and in particular relates to a slag buffer and slag-liquid real-time measurement and control system. Background Art

[0002] Dry slag pit cooling and water slag flushing are currently the most common methods for treating blast furnace slag. The dry slag pit cooling method generates large amounts of water vapor during cooling, along with the release of large amounts of H₂S and SO₂ gases, which corrode buildings, damage equipment, and degrade the working environment. The water slag flushing method wastes significant water resources, produces harmful gases such as SO₂ and H₂S, and fails to effectively recover the high-quality waste heat contained in the hot liquid slag. Currently, these treatment methods are no longer suitable for the urgent energy conservation and emission reduction needs of the steel industry.

[0003] Compared to the water slag method, dry processing technology not only saves a large amount of water resources, but also releases almost no harmful gases such as H2S and SO2. Therefore, it has significant economic and environmental performance and has received great attention in the industry. During the dry centrifugal granulation process, the high-temperature and high-viscosity slag is thrown off the surface of the turntable by the high-speed rotating turntable, forming droplets in the air. Then, it undergoes intense direct heat exchange with the heat transfer medium in the air, which reduces the temperature of the droplets and causes a phase change on the droplet surface, forming a solidified layer. As the temperature further decreases, the droplets gradually transform into small solid particles. Since blast furnace slag is mostly discharged intermittently, a high-temperature buffer device is required to ensure the stable operation of the dry centrifugal granulation system. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a slag buffer and slag liquid real-time measurement and control system to address the deficiencies in the above-mentioned existing technology, so as to solve the technical problem that the slag reserves in the liquid slag buffer device are difficult to monitor in real time due to intermittent slag discharge from the blast furnace during the current liquid slag dry granulation process.

[0005] The present invention adopts the following technical solutions:

[0006] A slag buffer and slag liquid real-time measurement and control system includes a first slag ladle and a second slag ladle connected to each other, the second slag ladle is connected to a granulation bin via a slag drop pipe, flow control devices are respectively provided at the connection between the first slag ladle and the second slag ladle, and at the connection between the second slag ladle and the granulation bin, the first slag ladle and the second slag ladle are respectively provided with a flow measuring device, the interiors of the first slag ladle and the second slag ladle are respectively provided with a safety device to prevent slag overflow, and a heat supplement unit for controlling the slag temperature to be constant.

[0007] Specifically, a sizing nozzle is provided at the connection between the first slag bag and the second slag bag, and at the connection between the second slag bag and the granulation bin.

[0008] Specifically, the flow measurement device includes a radar level meter and an ultrasonic flow meter. The radar level meter is respectively arranged on the top of the first slag bag and the second slag bag, and the ultrasonic flow meter is respectively arranged at the connection between the first slag bag and the second slag bag, and at the connection between the second slag bag and the granulation bin.

[0009] Specifically, the flow control device includes a stopper rod with a cooling device. There are two stopper rods, one end of each of which is arranged in the second slag bag, corresponding to the sizing water inlet at the connection between the first slag bag and the second slag bag, and the sizing water inlet at the connection between the second slag bag and the granulation bin, respectively. The other ends of the two stopper rods extend to the outside of the second slag bag to connect with the corresponding stepper motor.

[0010] Specifically, the supplementary heat unit includes a drying ladle burner, which is arranged on the top of the first slag ladle.

[0011] Specifically, the supplementary heat unit includes a supplementary heat device, which is provided at the connection between the second slag bag and the granulation bin. A wall temperature measuring device is also provided at the connection between the second slag bag and the granulation bin.

[0012] Specifically, the safety device includes a sliding gate, and there are two sliding gates, which are respectively arranged at the connection between the first slag bag and the second slag bag, and at the connection between the second slag bag and the granulation bin.

[0013] Specifically, the safety device includes an impact pad, which is arranged at the bottom of the first slag bag near the slag inlet. A slag dam, a slag weir and a slag wall are arranged in sequence on the side of the impact pad away from the slag inlet, and an emergency flow control gate is arranged on the rear side of the slag wall.

[0014] Specifically, an overflow port is provided on one side of the top of the first slag ladle.

[0015] Specifically, an emergency slag discharge port is provided at the bottom of the first slag bag, and the emergency slag discharge port is used to connect to the emergency slag pit.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects:

[0017] The present invention provides a slag buffer and slag liquid real-time measurement and control system, wherein the slag flows into a first slag ladle through a slag ditch, the side of the first slag ladle is connected to a second slag ladle, and a slag drop pipe is provided at the bottom of the second slag ladle, through which the slag enters a granulation bin; the first slag ladle buffers the slag intermittently discharged from the blast furnace, and the second slag ladle regulates the flow rate of the slag entering the granulation bin, thereby solving the problem of matching the intermittent slag discharge of the blast furnace with the operation of a waste heat recovery device.

[0018] Furthermore, a sizing water outlet and a flow control plug rod for side wall outflow are provided at the connection between the side of the first slag bag and the second slag bag to control the flow in case of accidents; a sizing water outlet and a flow control plug rod are provided at the bottom of the second slag bag; the purpose of real-time flow control is achieved by controlling the gap between the plug rod and the sizing water outlet, thereby ensuring flow stability and realizing safe and stable operation of the system.

[0019] Furthermore, the flow measurement device includes but is not limited to liquid level-based flow measurement, pipe flow non-destructive measurement, etc.; among which liquid level measurement includes but is not limited to radar level gauge, slag bag weighing and other methods, and pipe flow non-destructive measurement includes but is not limited to ultrasonic flow meter, electromagnetic flow meter and other methods; the flow measurement device is combined with the flow control device to realize real-time and accurate measurement of the system flow, ensuring safe and stable operation of the system.

[0020] Furthermore, a stepper motor is used to control the rise and fall of the plug rod, ensuring stable flow and achieving safe and stable operation of the system.

[0021] Furthermore, the drying burner on the top of the slag ladle has a heat supplement function to prevent blockage caused by cooling and solidification of the slag.

[0022] Furthermore, supplementary heating devices are respectively provided at the slag dropping pipe and the sizing nozzle to prevent the solidification of the slag during startup and long-term operation. The system heat supplement is related to the slag temperature. The slag temperature in the slag bag is measured in real time by an infrared thermometer. Combined with the supplementary heating of the burner, the slag temperature in the slag bag is controlled to be constant, thereby ensuring that the slag has reliable fluidity; wall temperature measuring devices are provided at the slag dropping pipe and the sizing nozzle, and real-time heating is performed in combination with the supplementary heating device. The supplementary heating device includes but is not limited to electromagnetic and other methods to achieve reliable fluidity of the slag in the sizing nozzle and the slag dropping pipe.

[0023] Furthermore, a sliding nozzle is provided at the sizing nozzle for secondary accident flow control, so as to protect the operational safety of subsequent devices and the safety of maintenance personnel when the stopper rod cannot effectively control the flow and needs to be replaced or the system is overhauled.

[0024] Furthermore, an impact pad is provided at the slag inlet. The impact pad is made of high-temperature resistant and corrosion-resistant materials to protect the slag ditch from impact erosion on the slag bag when it flows into the first slag bag. At the same time, in order to ensure the reliability of the slag bag outflow and prevent impurities in the slag from clogging the slag drop pipe and causing accidents, a slag weir is provided in the first slag bag in the cache to block the floating slag, and the slag dam blocks the heavier slag blocks. A small outflow opening is provided on the slag retaining wall, and an accident flow control gate is provided on one side of the wall in combination with the slag retaining wall to realize accident safety flow control.

[0025] Furthermore, an overflow port is provided on one side of the first slag ladle, and the slag flows out of the overflow port and falls directly into the corresponding accident slag pit, thereby preventing accidents caused by slag overflow.

[0026] Furthermore, an emergency slag discharge port is provided at the bottom of the first slag ladle, and during slag discharge, the molten slag flows out of the slag discharge port into the emergency slag pit.

[0027] In summary, the present invention ensures safe and stable operation of the system by monitoring the flow rate of high-temperature liquid slag from the slag ladle to the granulation device.

[0028] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the structure of the present invention;

[0030] Figure 2 Schematic diagram of the flow measurement device of the present invention;

[0031] Figure 3 Schematic diagram of the safety device of the present invention.

[0032] Among them: 1. Drying ladle burner; 2. Radar level gauge; 3. Overflow port; 4. Accident slag pit; 5. Accident slag discharge port; 6. Sliding water inlet; 7. Stopper rod; 8. Stepper motor; 9. Granulation bin; 10. Supplementary heat device; 11. Ultrasonic flow meter; 12. Slag inlet; 13. Impact pad; 14. Slag retaining dam; 15. Slag retaining weir; 16. Slag retaining wall; 17. Accident flow control gate. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0034] In the description of the present invention, it should be understood that the terms "center," "longitudinal," "lateral," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," "one side," "one end," and "one side" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, in the description of the present invention, unless otherwise specified, "a plurality" means two or more.

[0035] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0036] It will be understood that when used in this specification and the appended claims, the terms “comprises” and “comprising” indicate the presence of described features, integers, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0037] It should also be understood that the terms used in the present specification are only for the purpose of describing particular embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0038] It should be further understood that the term "and / or" used in the present description and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0039] The accompanying drawings illustrate various schematic diagrams of structures according to embodiments disclosed herein. These figures are not drawn to scale; for clarity, some details are exaggerated and some details may be omitted. The shapes of the various regions and layers shown in the figures, as well as their relative sizes and positional relationships, are merely exemplary and may deviate in practice due to manufacturing tolerances or technical limitations. Those skilled in the art may design regions / layers with different shapes, sizes, and relative positions as needed.

[0040] See also Figure 1 The present invention provides a slag buffer and slag liquid real-time measurement and control system, which includes a slag buffer device, a flow measuring device, a flow control device, a safety device and a heat supplement unit. The flow measuring device is combined with the flow control device to realize real-time and accurate measurement of the system flow, thereby ensuring safe and stable operation of the system. The safety device is used to prevent accidents caused by slag overflow. The heat supplement unit is used to control the slag temperature in the slag buffer device to be constant. By monitoring the flow of high-temperature liquid slag from the slag buffer device to the granulation device, the safe and stable operation of the system is guaranteed.

[0041] Specifically, the slag buffer device includes a first slag bag and a second slag bag. The slag flows into the first slag bag through a slag ditch to buffer the slag. One side of the bottom of the first slag bag is connected to the second slag bag. A slag dropping pipe is provided at the bottom of the second slag bag. The slag enters the granulation bin 9 through the slag dropping pipe. The flow control devices are respectively provided at the connection between the first slag bag and the second slag bag, and at the connection between the second slag bag and the slag dropping pipe; one end of the flow control device is respectively provided in the second slag bag, and is used to control the flow between the first slag bag and the second slag bag, and between the second slag bag and the slag dropping pipe, respectively. The flow measuring devices are respectively provided on the top side of the first slag bag and the second slag bag.

[0042] The flow control device includes two groups, which are respectively used to control the first slag bag and the second slag bag, and the second slag bag and the slag drop pipe. Each group includes a stopper rod 7 and a stepper motor 8. One end of the stopper rod 7 is connected to the stepper motor 8, and the other end is correspondingly connected to the sizing nozzle between the first slag bag and the second slag bag, and the sizing nozzle between the second slag bag and the slag drop pipe. The stepper motor 8 controls the rise and fall of the stopper 7. By controlling the gap between the stopper rod 7 and the corresponding sizing nozzle, the purpose of real-time control of the flow between the first slag bag and the second slag bag, and the second slag bag and the slag drop pipe is achieved.

[0043] The flow measurement devices in the system include but are not limited to liquid level-based flow measurement, pipe flow non-destructive measurement, etc.

[0044] Furthermore, liquid level measurement includes but is not limited to radar level meter 2, slag ladle weighing and other methods, pipe flow non-destructive measurement includes but is not limited to ultrasonic flow meter 11, electromagnetic flow meter and other methods, such as Figure 2 shown.

[0045] The safety device adopts three-level emergency flow control: stopper rod 7 flow control, sliding water gate 6 and emergency flow control gate 17.

[0046] Among them, an overflow port 3 is set on the upper side of the first slag bag, and an emergency slag discharge port 5 is set at the bottom of the first slag bag. During slag discharge, the slag flows out from the emergency slag discharge port 5 and enters the accident slag pit 4 to prevent the slag overflow from causing an accident.

[0047] See also Figure 3 An impact pad 13 is provided in the first slag ladle near the slag inlet 12, and the impact pad 13 is made of high temperature resistant and corrosion resistant material; a slag retaining dam 14, a slag retaining weir 15 and a slag retaining wall 16 are provided at intervals on the rear side of the impact pad 13 in the first slag ladle. The slag retaining dam 14 is vertically provided at the bottom of the first slag ladle, the slag retaining weir 15 is vertically provided at the top of the first slag ladle, and the slag retaining wall 16 is vertically provided between the top and bottom of the first slag ladle. An emergency flow control gate 17 is provided on one side of the slag retaining wall 16.

[0048] Furthermore, accident flow control is performed at the connection between the side of the first slag bag and the second slag bag through a sizing water outlet and a stopper rod 7 on the side wall, and a sliding water outlet 6 is provided at the sizing water outlet; accident flow control is performed at the connection between the bottom of the second slag bag and the slag dropping pipe through a corresponding sizing water outlet and a stopper rod 7, and at the same time, a sliding water outlet 6 is provided at the sizing water outlet for secondary accident flow control.

[0049] The stopper rod 7 is made of a material resistant to slag corrosion and erosion, and a cooling device is provided at the stopper rod, including but not limited to air cooling, inert gas cooling, etc.

[0050] The supplementary heat unit includes a drying ladle burner 1 and a supplementary heat device 10. The drying ladle burner 1 is arranged on the top of the first slag ladle, and the supplementary heat device 10 is arranged at the sizing nozzle between the second slag ladle and the slag drop pipe.

[0051] Furthermore, an infrared thermometer is provided on the top of the first slag ladle for real-time measurement of the slag temperature in the first slag ladle. Combined with the supplementary heat of the drying ladle burner 1, the constant control of the slag temperature in the first slag ladle is achieved.

[0052] Furthermore, a wall temperature measuring device is provided at the slag dropping pipe and the sizing nozzle, and real-time heating is performed in combination with the heating device 10. The heating device 10 includes but is not limited to electromagnetic and other methods.

[0053] The working principle of the slag buffer and slag liquid real-time measurement and control system of the present invention is as follows:

[0054] 1. The slag discharged from the blast furnace slag ditch flows into the first slag bag through the slag ditch. The first slag bag acts as a buffer to store the slag intermittently discharged from the blast furnace. Regardless of the blast furnace slag discharge flow rate, the stability of subsequent device operation is guaranteed;

[0055] The side of the first slag ladle is connected to the second slag ladle, and a flow control plug is provided at the connection to control the flow rate and flow velocity of the slag flowing from the first slag ladle to the second slag ladle, thereby ensuring a controllable relationship between the slag buffer volume in the first slag ladle and the slag volume in the second slag ladle;

[0056] A slag drop pipe and a matching flow control stopper are provided at the bottom of the second slag ladle. The molten slag enters the granulation bin through the slag drop pipe. By adjusting the opening of the stopper, the flow rate and flow velocity of the slag entering the granulation bin are regulated, thereby ensuring the flow stability and realizing safe and stable operation of the system. It solves the problems of excessive and unstable slag flow and irregular slag discharge time caused by the intermittent slag discharge of the blast furnace, and solves the technical difficulties of matching the operation of the waste heat recovery device.

[0057] 2. In addition to the problem of mismatch with blast furnace slag tapping, another technical difficulty faced by the slag buffer flow control device is that the viscosity of high-temperature slag changes rapidly with temperature. When the temperature is too low, the slag will cool and solidify, causing blockage. The present invention has a heating function on the drying burner on the top of the slag ladle. The slag temperature in the slag ladle is measured in real time by an infrared thermometer. Combined with the heating of the burner, the slag temperature in the slag ladle is controlled to be constant; heating devices are respectively provided at the slag drop pipe and the sizing nozzle. Combined with the wall temperature measuring devices provided at the slag drop pipe and the sizing nozzle, real-time heating is performed to control the reliable fluidity of the slag in the sizing nozzle and the slag drop pipe, and prevent the solidification of the slag during startup and long-term operation;

[0058] 3. Another major issue facing the slag buffer and slag liquid real-time measurement and control system is the safety and reliability of the system;

[0059] To ensure the service life of the first slag ladle, an impact pad is installed at the slag inlet. Made of high-temperature and corrosion-resistant materials, the pad protects the slag ditch from impact erosion on the ladle body when it flows into the first slag ladle. Furthermore, to ensure the reliability of the slag ladle outflow and prevent accidents caused by impurities in the slag clogging the slag drop pipe, a slag weir is installed in the first slag ladle to block floating slag. A slag dam blocks heavier slag blocks. A small outflow opening is installed on the slag retaining wall. An emergency flow control gate is installed on one side of the wall, and combined with the slag retaining wall, it ensures safe flow control in the event of an accident. An overflow port is installed on one side of the first slag ladle, allowing the slag to flow directly into the corresponding emergency slag pit, preventing accidents caused by slag overflow.

[0060] The two-stage flow measurement device for liquid level measurement and pipe flow non-destructive measurement provided in the present invention monitors the flow of high-temperature liquid slag from the slag bag to the granulation device. The opening of the flow control plug rod can be adjusted according to the detection data, thereby achieving the effect of real-time flow monitoring and ensuring the safe and stable operation of the system.

[0061] When the buffer device needs to be repaired or shut down, the emergency slag discharge port set at the bottom of the first slag bag can allow the slag to flow out from the slag discharge port into the emergency slag pit, thereby removing the residual slag in the first slag bag and facilitating shutdown and maintenance.

[0062] In summary, the slag buffer and slag liquid real-time measurement and control system of the present invention has the following characteristics:

[0063] 1. It overcomes the actual production conditions of discontinuous slag discharge from the blast furnace. The slag discharged from the blast furnace slag ditch flows into the first slag bag through the slag ditch. The first slag bag acts as a buffer to store the slag discharged intermittently from the blast furnace. Combined with the second slag bag and the supporting flow control device, the stability of subsequent device operation can be guaranteed regardless of the blast furnace slag discharge flow rate;

[0064] 2. The heating device at the ladle burner and slag drop pipe on the top of the slag ladle is combined with a temperature measuring device to provide real-time heating. This overcomes the problem of the slag buffer flow control device in which the viscosity of the high-temperature slag changes too quickly with temperature, resulting in blockage caused by the cooling and solidification of the slag. This ensures reliable control of the slag flowability in the sizing nozzle and slag drop pipe, preventing the solidification of the slag during startup and long-term operation.

[0065] 3. The safety and reliability of the slag buffer and slag liquid real-time measurement and control system are guaranteed. Impact pads are installed at the slag inlet of the first slag bag. Supporting safety equipment such as slag weirs, slag dams, slag walls, emergency flow control gate plates and overflow ports ensure the safety and reliability of the buffering and flow measurement process, ensuring the safe and stable operation of the system.

[0066] 4. When the buffer device needs to be repaired or shut down, the emergency slag discharge port set at the bottom of the first slag bag can allow the slag to flow out from the slag discharge port into the emergency slag pit, thereby removing the residual slag in the first slag bag and facilitating shutdown and maintenance.

[0067] The above content is only for explaining the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A slag buffer and slag liquid real-time measurement and control system, characterized in that: The invention comprises a first slag bag and a second slag bag connected to each other, the second slag bag is connected to a granulation bin (9) through a slag drop pipe, a flow control device is respectively provided at the connection between the first slag bag and the second slag bag, and at the connection between the second slag bag and the granulation bin (9), the flow control device comprises a stopper rod (7) with a cooling device, the stopper rod (7) comprises two, one end of each of the two stopper rods (7) is arranged in the second slag bag, and corresponds to the sizing water outlet at the connection between the first slag bag and the second slag bag, and the sizing water outlet at the connection between the second slag bag and the granulation bin (9), the other ends of the two stopper rods (7) are respectively extended to the outside of the second slag bag to be connected to the corresponding stepping motor (8), the first slag bag and the second slag bag are respectively provided with a flow measuring device, and the interiors of the first slag bag and the second slag bag are respectively provided with a safety device to prevent slag overflow, and a supplementary device for controlling the constant slag temperature of the slag. The heat unit, the safety device includes a sliding water inlet (6) and an impact pad (13), the sliding water inlet (6) includes two, which are respectively arranged at the connection between the first slag bag and the second slag bag, and at the connection between the second slag bag and the granulation bin (9), the impact pad (13) is arranged at the bottom of the first slag bag near the slag inlet (12), and a slag retaining dam (14), a slag retaining weir (15) and a slag retaining wall (16) are sequentially arranged on the side of the impact pad (13) away from the slag inlet (12), and an emergency flow control gate (17) is arranged on the rear side of the slag retaining wall (16); the supplementary heat unit includes a drying bag burner (1) and a supplementary heat device (10), the supplementary heat device (10) is arranged at the connection between the second slag bag and the granulation bin (9), and a wall temperature measuring device is also arranged at the connection between the second slag bag and the granulation bin (9), and the drying bag burner (1) is arranged on the top of the first slag bag.

2. The slag buffer and slag liquid real-time measurement and control system according to claim 1 is characterized in that: A sizing nozzle is provided at the connection between the first slag bag and the second slag bag, and at the connection between the second slag bag and the granulation bin (9).

3. The slag buffer and slag liquid real-time measurement and control system according to claim 1 is characterized in that: The flow measurement device comprises a radar level meter (2) and an ultrasonic flow meter (11), wherein the radar level meter (2) is respectively arranged at the top of the first slag ladle and the second slag ladle, and the ultrasonic flow meter (11) is respectively arranged at the connection between the first slag ladle and the second slag ladle, and at the connection between the second slag ladle and the granulation bin (9).

4. The slag buffer and slag liquid real-time measurement and control system according to claim 1 is characterized in that: An overflow port (3) is provided on one side of the top of the first slag ladle.

5. The slag buffer and slag liquid real-time measurement and control system according to claim 1 is characterized in that: An accident slag discharge port (5) is provided at the bottom of the first slag ladle, and the accident slag discharge port (5) is used to connect to the accident slag pit (4).

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