Automatic slagging and slag disposal system of billet heating furnace

Abstract

The application discloses a kind of automatic deslagging and slag disposal systems of billet heating furnace, including heating furnace and multiple settings in the bottom of heating furnace fall slag pipe, electromagnetic valve is provided on fall slag pipe, the lower end of fall slag pipe is provided with slag collecting cylinder, multiple horizontal poles are provided in slag collecting cylinder side by side, pull plate is placed on horizontal pole, recess is machined on the upper and lower surfaces of pull plate, rack is provided in recess, drive device is installed on the outside of slag collecting cylinder, the gear meshing with rack is provided on the output shaft of drive device, the slag outlet of the bottom of slag collecting cylinder is connected with flushing pipe, the water outlet end of flushing pipe is connected with slag-water separator after bending downward, drying apparatus is provided on the side of slag-water separator, conveying belt is provided in drying apparatus, and the drying apparatus above the discharging end of conveying belt is communicated with the exhaust pipe of heating furnace through gas conveying pipe. The application has the advantages of high work efficiency, good deslagging effect, short disposal period and no environmental pollution.

Description

Technical Field

[0001] This invention relates to the field of heating equipment technology, specifically to an automatic slag discharge and slag disposal system for a billet heating furnace. Background Technology

[0002] Billet heating furnaces are commonly used heating equipment in steel rolling mills, typically used for preheating of bars, wires, sections, plates, and strips before rolling. During the heating process, oxide slag is inevitably generated. With increasing emphasis on energy conservation and emission reduction, the heat charge rate of heating furnaces is also increasing. Consequently, more and more oxide slag is brought into the furnace with the billets. While a small portion is carried out of the furnace with the billets, the majority of this oxide slag settles at the bottom of the furnace. Once it accumulates to a certain extent, it obstructs burner combustion and hinders heating. To ensure the normal operation of the heating furnace, the oxide slag inside the furnace needs to be cleaned regularly. Currently, many steel rolling mills use manual slag removal for cleaning, which is difficult, labor-intensive, and has a large workload, resulting in high labor and operating costs. Although some steel rolling mills have installed slag removal devices at the furnace head, where oxidized slag falls into the furnace head chute and then flows to the slag discharge port for discharge, this method has the problem of difficulty in opening the slag discharge port, which can even block the slag discharge channel in severe cases. In addition, if the slag discharge port is kept open for a long time, outside air will enter the furnace, reducing the heating effect of the steel billet and increasing the amount of oxidized slag due to the increased oxygen content in the furnace.

[0003] Oxidized slag has a high Fe content and can typically be used as a raw material for the production of ferrosilicon alloys or ferroboron, as well as as a partial additive in blast furnace ironmaking. Current technologies primarily involve collecting the slag by flushing it with wastewater, then piling it up for natural drying. Only when the moisture content is below 5% is it sent to ferrosilicon plants for use as raw material. This process suffers from problems such as excessively long drying cycles, large land occupation, and environmental pollution. Therefore, developing an automated slag discharge and disposal system for billet heating furnaces that is highly efficient, effectively removes slag, has a short processing cycle, and does not pollute the environment is objectively necessary. Summary of the Invention

[0004] The purpose of this invention is to provide an automatic slag discharge and slag disposal system for billet heating furnaces that is highly efficient, has good slag removal effect, short treatment cycle, and does not pollute the environment.

[0005] The objective of this invention is achieved as follows: It includes a heating furnace and multiple slag discharge pipes located at the bottom of the heating furnace. Each slag discharge pipe is equipped with a solenoid valve. A slag collection cylinder is located at the lower end of each slag discharge pipe. Multiple horizontal bars are arranged side-by-side inside the slag collection cylinder, and a pull-out plate is placed on each horizontal bar. One end of the pull-out plate extends to the outside of the slag collection cylinder. Grooves are machined on both the upper and lower surfaces of the pull-out plate, and racks are installed within the grooves. A driving device is installed on the outside of the slag collection cylinder. A gear meshing with the rack is installed on the output shaft of the driving device. A flushing pipe is connected to the slag outlet at the bottom of the slag collection cylinder. The water outlet of the flushing pipe is bent downwards and connected to a slag-water separator. A dryer is located on one side of the slag-water separator. A conveyor belt is installed inside the dryer. The slag outlet of the slag-water separator is connected to the dryer above the feed end of the conveyor belt via a slag discharge pipe. The dryer above the discharge end of the conveyor belt is connected to the exhaust pipe of the heating furnace via a gas transmission pipe.

[0006] Furthermore, rollers are installed on the crossbar.

[0007] Furthermore, the pull-out plate is set at an angle, with its higher end extending to the outside of the slag collection cylinder.

[0008] Furthermore, the flushing pipe is set at an angle, with the inlet end being the higher end and the outlet end being the lower end.

[0009] Furthermore, two annular plates are spaced apart on the inner wall of the slag collection cylinder, and a pull plate is located between the two annular plates. The distance between the two annular plates is 1 to 3 mm greater than the thickness of the pull plate.

[0010] Furthermore, an annular sealing gasket is provided on the ring plate facing the pull-out plate side.

[0011] Furthermore, multiple baffles are spaced apart on the top of the dryer along the conveying direction of the conveyor belt.

[0012] Furthermore, multiple inverted V-shaped slag guide blocks are arranged side by side at the bottom of the heating furnace, and the upper end of the slag discharge pipe is connected to the bottom of the heating furnace between two adjacent slag guide blocks.

[0013] Furthermore, a sedimentation tank is installed at the bottom of the sludge-water separator.

[0014] Furthermore, the outlet of the sludge-water separator is connected to the inlet of the flushing pipe via a circulation pipe, and a water pump is installed on the circulation pipe.

[0015] The beneficial effects of this invention are as follows:

[0016] I. During operation, the pull-out plate is located inside the slag collecting cylinder, with its end abutting against the inner wall of the cylinder, dividing it into upper and lower sections. At this time, the system is in a slag-falling and slag-collecting state. Oxide slag on the steel billet continuously falls to the bottom of the furnace, along the slag-falling pipe, and into the slag collecting cylinder. Obstructed by the pull-out plate, it continuously accumulates on the plate. After the furnace has been running for a period of time, once the oxide slag in the slag collecting cylinder has accumulated to a certain height, the drive device is activated. The drive device drives the gear to rotate. Since the gear meshes with a rack, when the gear rotates, it can drive the pull-out plate to move outwards from the slag collecting cylinder via the rack. The distance between the end of the pull-out plate and the inner wall of the slag collecting cylinder continuously increases, forming a space for oxide slag to accumulate. The slag falls through a channel into a flushing pipe. Turbid circulating water or other water sources are introduced into the flushing pipe, and the water flow carries the slag along the pipe into a slag-water separator. The slag is separated in the separator and discharged into a dryer, landing on a conveyor belt. The conveyor belt transports the slag forward, while simultaneously sending high-temperature flue gas from the heating furnace into the dryer through a gas supply pipe. The moisture on the slag evaporates due to the heat and is carried away by the high-temperature flue gas. The resulting dry slag is discharged from the conveyor belt's outlet. After the slag in the slag collection cylinder is completely discharged, the drive device is restarted. The drive device drives the gears to rotate in the opposite direction, causing the pull plate to reset. This process is repeated continuously to discharge and dry the slag from the billet heating furnace. The entire slag discharge and drying process is automated, requiring no manual intervention. This high efficiency significantly reduces the need for manual labor, decreases worker workload, and lowers labor and operating costs.

[0017] Second, when the oxidized slag in the slag collection cylinder accumulates to a certain extent and needs to be discharged, the pull plate can be pulled out by the drive device. Simply pull the pull plate out of the slag collection cylinder, and the oxidized slag will fall under its own gravity. Conversely, simply push the pull plate back into the slag collection cylinder, and the slag will be prevented from falling. The entire process can be driven by the drive device, and the slag discharge process can proceed smoothly without clogging. Furthermore, when the invention is in the slag collection state, the pull plate's four sides abut against the inner wall of the slag collection cylinder, which can play a sealing role, thus... To prevent flue gas from escaping from the heating furnace and to prevent outside air from entering the furnace through the slag discharge pipe, this invention, when in slag discharge mode, forms a channel between the end of the pull-out plate and the inner wall of the slag collection cylinder for the oxide slag to fall. At this time, the solenoid valve can be temporarily closed to prevent flue gas from escaping from the heating furnace and to prevent outside air from entering the furnace. The oxide slag generated during this period is temporarily stored in the slag discharge pipe and at the bottom of the heating furnace. After slag discharge is complete, the solenoid valve is opened, and the oxide slag that has fallen into the slag discharge pipe and at the bottom of the heating furnace falls into the slag collection cylinder, entering the slag discharge and collection state. Therefore, the slag discharge process of this invention is smooth, and outside air will not enter the heating furnace, ensuring the heating effect of the steel billet in the heating furnace and preventing the problem of increased oxide slag caused by outside air entering the furnace.

[0018] Third, after collecting the oxide slag, this invention first passes it into a slag-water separator for separation, separating the oxide slag from the water. Then, it passes it into a dryer, where the high-temperature flue gas discharged from the furnace heats and dries the oxide slag, rapidly evaporating the moisture and completing the drying process. Compared to the traditional method of naturally drying oxide slag by stockpiling, this significantly shortens the drying cycle and allows for timely removal of the dried oxide slag, preventing the occupation of large areas of land. It also avoids environmental pollution problems such as wastewater seepage and dust generation caused by oxide slag stockpiling. Furthermore, the heat source for drying the oxide slag in this invention is the high-temperature flue gas discharged from the furnace, which is the exhaust gas from the furnace itself, thus avoiding additional energy consumption and reducing the cost of oxide slag disposal.

[0019] In summary, this invention can automatically discharge the oxide slag from the heating furnace without much manual intervention. The entire slag discharge and disposal process can be carried out automatically and continuously, resulting in high work efficiency. Secondly, the oxide slag discharge process is smooth and not prone to blockage, preventing outside air from entering the heating furnace and ensuring the heating effect of the steel billets inside. In addition, using the high-temperature flue gas discharged from the heating furnace itself to dry the oxide slag not only recovers and utilizes the waste heat of the high-temperature flue gas, but also significantly improves the drying efficiency of the oxide slag, shortens the disposal cycle of the oxide slag, and does not generate additional energy consumption. The dried oxide slag can be transported away in a timely manner, avoiding the disposal process of natural drying by stacking oxide slag, thereby avoiding the environmental pollution problems caused by the stacking of oxide slag. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the slag collection cylinder 4 in this invention;

[0022] Figure 3 This is a schematic diagram of the pull-out plate 6 in this invention;

[0023] In the diagram: 1-Heating furnace, 2-Slag discharge pipe, 3-Solenoid valve, 4-Slag collection cylinder, 5-Crossbar, 6-Pull-out plate, 7-Rack, 8-Gear, 9-Water flushing pipe, 10-Slag-water separator, 11-Dryer, 12-Conveyor belt, 13-Gas supply pipe, 14-Roller, 15-Ring plate, 16-Annular sealing gasket, 17-Baffle, 18-Slag guide block, 19-Sedimentation tank, 20-Circulation pipe. Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings, but this is not intended to limit the present invention in any way. Any changes or improvements made based on the present invention shall fall within the protection scope of the present invention.

[0025] like Figures 1-3 As shown, the present invention includes a heating furnace 1 and multiple slag discharge pipes 2 disposed at the bottom of the heating furnace 1. The heating furnace 1 and slag discharge pipes 2 are existing structures. A solenoid valve 3 is installed on the slag discharge pipe 2. A slag collection cylinder 4 is installed at the lower end of the slag discharge pipe 2. Multiple crossbars 5 are arranged side-by-side inside the slag collection cylinder 4. Pull-out plates 6, which abut against the inner wall of the slag collection cylinder 4, are placed on the crossbars 5. One end of the pull-out plate 6 extends to the outside of the slag collection cylinder 4. Grooves are machined on both the upper and lower surfaces of the pull-out plate 6, and racks 7 are disposed within the grooves. A driving device is installed on the outside of the slag collection cylinder 4. The driving device is existing equipment, typically a geared motor. A geared motor is provided on the output shaft of the driving device to mesh with the rack 7. Gear 8, the slag outlet at the bottom of the slag collection cylinder 4 is connected to a flushing pipe 9, the water outlet of the flushing pipe 9 is bent downward and connected to a slag-water separator 10, the slag-water separator 10 is an existing solid-liquid separation device, used to separate the oxidation slag from the water, a dryer 11 is set on one side of the slag-water separator 10, a conveyor belt 12 is set inside the dryer 11, the conveyor belt 12 is an existing conveying device, in order to adapt to the high temperature requirements, a chain plate structure can be used, the slag outlet of the slag-water separator 10 is connected to the dryer 11 above the feed end of the conveyor belt 12 through the slag outlet pipe, the dryer 11 above the discharge end of the conveyor belt 12 is connected to the exhaust pipe of the heating furnace 1 through a gas transmission pipe 13.

[0026] During operation, the pull-out plate 6 is located inside the slag collecting cylinder 4, with its end abutting against the inner wall of the slag collecting cylinder 4, dividing the slag collecting cylinder 4 into upper and lower parts. At this time, the system is in the slag falling and collecting state. The oxide slag on the steel billet continuously falls to the bottom of the heating furnace 1 and falls into the slag collecting cylinder 4 along the slag falling pipe 2. It is blocked by the pull-out plate 6 and continuously accumulates on the pull-out plate 6. After the heating furnace 1 has been running for a period of time, when the oxide slag in the slag collecting cylinder 4 accumulates to a certain height, the drive device is activated. The drive device drives the gear 8 to rotate. Since the gear 8 meshes with the rack 7, when the gear 8 rotates, it can drive the pull-out plate 6 to move to the outside of the slag collecting cylinder 4 through the rack 7. The distance between the end of the pull-out plate 6 inside the slag collecting cylinder 4 and the inner wall of the slag collecting cylinder 4 continuously increases, forming a space for the oxide slag to fall. The slag falls into the flushing pipe 9 through the channel. Turbid circulating water or other water sources are introduced into the flushing pipe 9, and the water flow carries the slag along the flushing pipe 9 into the slag-water separator 10. The slag is separated in the slag-water separator 10 and discharged into the dryer 11, falling onto the conveyor belt 12, which then transports it forward. Simultaneously, high-temperature flue gas from the heating furnace 1 is sent to the dryer 11 through the gas supply pipe 13. The moisture on the slag evaporates due to the heat and is carried away by the high-temperature flue gas. The resulting dried slag is discharged from the discharge end of the conveyor belt 12. After the slag in the slag collection cylinder 4 is completely discharged, the drive device is restarted. The drive device drives the gear 8 to rotate in the opposite direction, causing the pull plate 6 to reset. This process is repeated continuously to discharge the slag discharged from the billet heating furnace and achieve slag drying. The entire slag discharge process and the slag drying process are automated, requiring no manual intervention. This high efficiency significantly reduces the need for manual labor, decreases worker workload, and lowers labor and operating costs.

[0027] When the oxidized slag in the slag collection cylinder 4 accumulates to a certain extent and needs to be discharged, the pull plate 6 can be pulled out by the drive device. Simply pull the pull plate 6 out of the slag collection cylinder 4, and the oxidized slag will fall under its own gravity. Conversely, simply push the pull plate 6 back into the slag collection cylinder 4, and the slag will be stopped from falling. The entire process can be driven by the drive device, and the slag discharge process can proceed smoothly without clogging. Secondly, when the present invention is in the slag collection state, the pull plate 6 is pressed against the inner wall of the slag collection cylinder 4, which can play a sealing role and prevent heating. The invention allows flue gas to escape from furnace 1 while preventing outside air from entering the furnace 1 through the slag discharge pipe 2. When the invention is in the slag discharge state, a channel for oxide slag to fall is formed between the end of the pull plate 6 and the inner wall of the slag collection cylinder 4. At this time, the solenoid valve 3 can be temporarily closed to prevent flue gas from escaping from the furnace 1 and to prevent outside air from entering the furnace 1. The oxide slag generated during this period is temporarily stored in the slag discharge pipe 2 and the bottom of the furnace 1. After the slag discharge is completed, the solenoid valve 3 is opened, and the oxide slag that has fallen into the slag discharge pipe 2 and the bottom of the furnace 1 can fall into the slag collection cylinder 4, entering the slag discharge and collection state. It can be seen that the slag discharge process of the invention is smooth, and outside air will not enter the furnace 1 during slag discharge, which can ensure the heating effect of the steel billet in the furnace 1 and prevent the problem of increased oxide slag caused by outside air entering the furnace.

[0028] After collecting the oxide slag, this invention first passes it into a slag-water separator 10 for slag-water separation, separating the oxide slag from the water. Then, it passes it into a dryer 11, where the high-temperature flue gas discharged from the heating furnace 1 heats and dries the oxide slag. This quickly evaporates the moisture in the oxide slag, completing the drying process. Compared to the traditional method of naturally drying oxide slag by piling it up, this significantly shortens the drying cycle and allows for timely removal of the dried oxide slag, preventing the occupation of large areas of land. It also avoids environmental pollution problems such as wastewater seepage and dust generation caused by oxide slag storage. Furthermore, the heat source for drying the oxide slag in this invention is the high-temperature flue gas discharged from the heating furnace 1, which is the exhaust gas discharged by the heating furnace 1 itself, thus avoiding additional energy consumption and reducing the cost of oxide slag disposal.

[0029] The pull-out plate 6 is placed on the crossbar 5. When it is pulled out and moved, sliding friction occurs between it and the crossbar 5, which may damage the pull-out plate 6 and the crossbar 5, reduce their service life, and increase the power consumption of the drive device. In order to solve the above problems, a roller 14 is provided on the crossbar 5. In this way, when the pull-out plate 6 moves, the roller 14 rotates, avoiding contact and friction between the pull-out plate 6 and the crossbar 5, extending the service life of the pull-out plate 6 and the crossbar 5, reducing the power consumption of the drive device, and making the pull-out plate 6 move more smoothly.

[0030] The pull plate 6 is inclined, with its higher end extending to the outside of the slag collection cylinder 4 and its lower end located inside the slag collection cylinder 4, which facilitates the discharge of oxidized slag. Compared with the horizontally arranged pull plate 6, the oxidized slag can slide downward on the inclined pull plate 6, which can discharge the oxidized slag accumulated in the slag collection cylinder 4 more quickly.

[0031] Preferably, in order to facilitate the flushing away of oxide residue and avoid the accumulation of oxide residue inside the flushing pipe 9 causing blockage, the flushing pipe 9 is set at an angle, with the water inlet end of the flushing pipe 9 being the higher end and the water outlet end being the lower end.

[0032] Two annular plates 15 are spaced vertically on the inner wall of the slag collection cylinder 4. A pull-out plate 6 is located between the two annular plates 15. The distance between the two annular plates 15 is 1-3 mm greater than the thickness of the pull-out plate 6. The two annular plates 15 guide the pull-out plate 6, limiting and guiding it when it moves, preventing it from tilting or warping. Secondly, the lower annular plate 15 supports the pull-out plate 6, supporting its edges and preventing deformation when oxidized slag accumulates on it, thus extending its service life.

[0033] In order to improve the sealing performance between the ring plate 15 and the pull plate 6 and prevent outside air from entering the slag collection cylinder 4 through the gap between the ring plate 15 and the pull plate 6, and then entering the heating furnace 1 and affecting the heating effect of the steel billet, an annular sealing gasket 16 is provided on the ring plate 15 facing the pull plate 6. The annular sealing gasket 16 is a prior art technology and is made of high temperature resistant material.

[0034] When the high-temperature flue gas generated in the heating furnace 1 enters the dryer 11, it flows towards the feed end of the conveyor belt 12. However, due to the upward movement of the hot air, some of the high-temperature flue gas flows directly along the top of the dryer 11 without contacting the oxide slag on the conveyor belt 12, resulting in a reduction in the drying efficiency of the oxide slag and a waste of heat in the high-temperature flue gas. To improve this problem, multiple baffles 17 are spaced apart at the top of the dryer 11 along the conveying direction of the conveyor belt 12. When the high-temperature flue gas enters the dryer 11, it is blocked by the baffles 17, and the airflow flows downward, forcing the high-temperature flue gas to contact the oxide slag and improving the drying efficiency of the oxide slag.

[0035] When the heating furnace 1 is running continuously, the oxide slag on the surface of the steel billet will continuously fall. Some of the oxide slag will fall into the gap between two adjacent slag discharge pipes 2 and accumulate continuously, forming a blind spot for cleaning oxide slag. Over time, this will affect the normal operation of the heating furnace 1. To avoid the above problems, multiple inverted V-shaped slag guide blocks 18 are arranged side by side at the bottom of the heating furnace 1. The upper end of the slag discharge pipe 2 is connected to the bottom of the heating furnace 1 between two adjacent slag guide blocks 18. In this way, all the falling oxide slag can slide down the inclined surface of the slag guide block 18 into the corresponding slag discharge pipe 2, which improves the cleaning effect of oxide slag and can discharge oxide slag from the heating furnace 1 as much as possible, preventing oxide slag from accumulating in the heating furnace 1.

[0036] The bottom of the slag-water separator 10 is equipped with a sedimentation tank 19. The slag-water separator 10 is an existing technology that can separate the oxidized slag from the wastewater to obtain wastewater. However, in actual use, it has been found that the wastewater after separating the oxidized slag often still contains a lot of small-sized oxidized slag particles. Over time, as the oxidized slag continues to accumulate and settle, it will cause blockage of wastewater conveying pipes and related equipment such as water pumps. In order to avoid the above situation, a sedimentation tank 19 is set up to further settle these oxidized slag particles, obtain a purer upper layer of wastewater, and reduce the probability of blockage of wastewater conveying pipes, water pumps and other equipment.

[0037] The outlet of the slag-water separator 10 is connected to the inlet of the flushing pipe 9 via a circulation pipe 20. A water pump is installed on the circulation pipe 20. The oxidized slag is separated from the water in the slag-water separator 10. The water after separating the oxidized slag is returned to the flushing pipe 9 through the circulation pipe 20 for recycling, forming a closed-loop recycling of wastewater. This can save water resources, reduce water consumption, and thus reduce the operating cost of the system. During use, some water will adhere to the oxidized slag and be discharged with it, or some water will evaporate, which will inevitably cause the loss of recycled water. According to the amount of recycled water, a water replenishment pipe can be installed on the flushing pipe 9 to replenish the water in the wastewater recycling system, ensuring that the oxidized slag can be flushed away by the wastewater and preventing the flushing pipe 9 from being blocked due to the accumulation of oxidized slag.

Claims

1. An automatic slag discharge and slag disposal system for a billet heating furnace, comprising a heating furnace (1) and a plurality of slag discharge pipes (2) disposed at the bottom of the heating furnace (1), characterized in that... The slag discharge pipe (2) is equipped with a solenoid valve (3), and a slag collection cylinder (4) is installed at the lower end of the slag discharge pipe (2). Multiple crossbars (5) are arranged side by side inside the slag collection cylinder (4). Pull-out plates (6) are placed on the crossbars (5) and their periphery abuts against the inner wall of the slag collection cylinder (4). One end of the pull-out plate (6) extends to the outside of the slag collection cylinder (4). Grooves are machined on both the upper and lower surfaces of the pull-out plate (6), and racks (7) are installed in the grooves. A drive device is installed on the outside of the slag collection cylinder (4), and the output shaft of the drive device is equipped with teeth that mesh with the racks (7). The bottom of the slag collection cylinder (4) is connected to a flushing pipe (9). The water outlet of the flushing pipe (9) is bent downward and connected to a slag-water separator (10). A dryer (11) is provided on one side of the slag-water separator (10). A conveyor belt (12) is provided inside the dryer (11). The slag outlet of the slag-water separator (10) is connected to the dryer (11) above the feed end of the conveyor belt (12) through the slag outlet pipe. The dryer (11) above the discharge end of the conveyor belt (12) is connected to the exhaust pipe of the heating furnace (1) through a gas transmission pipe (13).

2. The automatic slag discharge and slag disposal system for a billet heating furnace according to claim 1, characterized in that... Rollers (14) are provided on the crossbar (5).

3. The automatic slag discharge and slag disposal system for a billet heating furnace according to claim 1, characterized in that... The pull plate (6) is inclined, with its higher end extending to the outside of the slag collection cylinder (4).

4. The automatic slag discharge and slag disposal system for a billet heating furnace according to claim 1, characterized in that... The flushing pipe (9) is set at an angle, with the inlet end of the flushing pipe (9) being the higher end and the outlet end being the lower end.

5. The automatic slag discharge and slag disposal system for a billet heating furnace according to claim 1, characterized in that... The inner wall of the slag collection cylinder (4) is provided with two ring plates (15) spaced vertically. The pull plate (6) is located between the two ring plates (15). The distance between the two ring plates (15) is 1-3 mm greater than the thickness of the pull plate (6).

6. The automatic slag discharge and slag disposal system for a billet heating furnace according to claim 5, characterized in that... An annular sealing gasket (16) is provided on the ring plate (15) facing the pull-out plate (6).

7. The automatic slag discharge and slag disposal system for a billet heating furnace according to claim 1, characterized in that... The top of the dryer (11) is provided with multiple baffles (17) at intervals along the conveying direction of the conveyor belt (12).

8. The automatic slag discharge and slag disposal system for a billet heating furnace according to claim 1, characterized in that... The bottom of the heating furnace (1) is provided with multiple inverted V-shaped slag guide blocks (18) arranged side by side, and the upper end of the slag discharge pipe (2) is connected to the bottom of the heating furnace (1) between two adjacent slag guide blocks (18).

9. The automatic slag discharge and slag disposal system for a billet heating furnace according to claim 1, characterized in that... The bottom of the sludge-water separator (10) is provided with a sedimentation tank (19).

10. An automatic slag discharge and slag disposal system for a billet heating furnace according to claim 1, characterized in that... The outlet of the slag-water separator (10) is connected to the inlet of the flushing pipe (9) through a circulation pipe (20), and a water pump is installed on the circulation pipe (20).

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