A method for recovering waste heat from thermal crushing of steel slag

Abstract

The present invention belongs to the technical field of high-temperature molten slag treatment in the iron and steel metallurgical industry, and specifically relates to a method for recovering waste heat from thermal crushing of steel slag; it comprises a waste heat recovery device for thermal crushing of steel slag, and the waste heat recovery device for thermal crushing of steel slag comprises a vertical closed chamber, a roller and a sleeve; the roller is supported in the closed chamber by a hollow shaft, and the hollow shaft is connected to a rotating drive mechanism outside the closed chamber, and the outer surface of the roller is wound with spiral lifting blades from bottom to top in a circumferential direction, and crushing teeth perpendicular to the axis of the roller are arranged between the spiral lifting blades; steel slag is fed into the closed chamber from a slag inlet; the spiral lifting blades stir the steel slag and lift it upward at the same time, and the lifted steel slag falls downward through the gap between the spiral lifting blades and the inner wall of the closed chamber, and the crushing teeth are used to shear the steel slag when the roller rotates; the present invention provides a relatively closed limited space processing device and a method of using the same, which can effectively recover the sensible heat energy carried by the steel slag while thermally crushing the steel slag with low energy consumption.

Description

Technical Field

[0001] The present invention belongs to the technical field of high-temperature molten slag treatment in the steel and metallurgical industry, and in particular relates to a method for recovering waste heat from thermal crushing of steel slag. Background Art

[0002] The existing steel slag treatment process does not recycle the huge sensible heat resources of high-temperature steel slag, and the currently commonly used drum method and pressurized or atmospheric roller hot crushing process consume a large amount of water resources. In particular, the roller hot crushing process generates a large amount of dust-containing water vapor by spraying a large amount of water to cool the high-temperature steel slag in an open space. The dust removal air volume must reach about 400,000 cubic meters per hour, which greatly increases the system's dust removal workload, the operating energy consumption remains high, and the company's production costs. Summary of the Invention

[0003] The present invention aims to solve the problems of large consumption of water resources and high operating energy consumption in the currently commonly used roller method, pressurized or atmospheric roller hot crushing steel slag treatment process.

[0004] The present invention provides the following technical solutions: a steel slag thermal crushing waste heat recovery method, comprising a steel slag thermal crushing waste heat recovery device, the steel slag thermal crushing waste heat recovery device comprising a vertical closed chamber, a drum and a casing;

[0005] The closed cavity is provided with a slag inlet and a slag outlet. The closed cavity is covered by a first fluid channel. The inlet of the first fluid channel is located at the lower part of the closed cavity, and the outlet is located at the upper part of the closed cavity. The inlet and outlet of the first fluid channel are used to be connected to the medium circulation system.

[0006] The drum is supported in the closed cavity by a hollow shaft, which is connected to a rotary drive mechanism outside the closed cavity. Spiral lifting blades are wound around the outer surface of the drum from bottom to top in an annular direction, and crushing teeth perpendicular to the drum axis are arranged between the spiral lifting blades. A second fluid channel is attached to the inner wall of the drum, with the inlet of the second fluid channel located at the bottom of the drum and the outlet located at the top of the drum.

[0007] The sleeve is connected to the inlet of the second fluid channel from the outside of the closed cavity through the outlet of the hollow shaft, and the outlet of the second fluid channel is connected to the gap between the sleeve and the hollow shaft; the outer pipe openings of the sleeve and the hollow shaft are used to connect to the medium circulation system;

[0008] The slag is fed into the closed chamber from the slag inlet. The slag liquid level maintains a preset distance from the top of the closed chamber, forming radiation heat absorption. The side and bottom surfaces of the closed chamber and the drum are in contact with the slag, forming conduction heat absorption.

[0009] The rotary drive mechanism drives the drum to rotate, and the spiral lifting blades stir the slag and lift it upward. The lifted slag falls downward through the gap between the spiral lifting blades and the inner wall of the closed chamber. The crushing teeth are used to shear the slag when the drum rotates, evenly crushing the slag while the first fluid channel and the second fluid channel fully absorb the residual heat of the slag.

[0010] The crushed and cooled steel slag is discharged from the slag outlet of the closed cavity.

[0011] Furthermore, the hollow shaft passes through the drum, the upper part is connected to the rotary drive mechanism, the lower end is set as a concave surface, and a base is installed under the drum in the closed cavity. The upper surface of the base is a spherical surface, which cooperates with the concave surface of the lower end of the hollow shaft to form a ball joint support.

[0012] Furthermore, the steel slag thermal crushing waste heat recovery device further comprises a slag pot and a top cover, wherein the top cover is buckled with the slag pot to form a closed cavity;

[0013] The slag inlet is arranged on the top cover, and the slag outlet is arranged at the bottom of the slag tank; the hollow shaft passes through the top cover to connect with the rotary drive mechanism, the base is embedded in the bottom of the slag tank, and the spherical surface enters the closed cavity.

[0014] Furthermore, the sealing interlayers of the slag pot and the top cover respectively constitute a first fluid channel, and a medium inlet and a medium outlet are respectively provided at the opposite ends of the top cover; an inlet channel and a plurality of outflow channels connected to the first fluid channel on the slag pot and converging to the inlet channel are provided in the base.

[0015] Furthermore, pipes are arranged in the interlayers of the slag pot and the top cover respectively, and the gaps are filled with heat-conducting material; the pipes constitute the first fluid channel.

[0016] Furthermore, the steel slag thermal crushing waste heat recovery device also includes a slag hopper, and a crushing mechanism is provided on the upper part of the slag hopper to crush the steel slag; an unloadable grid is installed in the middle part of the slag hopper, and a chute is formed at the lower part of the slag hopper to connect to the slag inlet. The crushed small particles of steel slag fall through the grid holes, and the large pieces of steel slag that cannot be crushed are hoisted by lifting the grid and unloaded to the designated area.

[0017] Furthermore, a scraper is provided under the drum to clean the steel slag stored at the bottom and push the steel slag to the slag outlet as the drum rotates.

[0018] Furthermore, the bottom of the slag pot is designed to be a closed funnel shape, and the base is located in the center of the funnel.

[0019] Furthermore, the rotary drive mechanism is supported by a support column and a tripod, the support column is attached to the outer wall of the slag pot, the tripod is arranged above the top cover, and the three vertices are built on the support column;

[0020] There is a horizontal beam parallel to the bottom edge in the tripod, and two vertical beams perpendicular to the horizontal beam and the bottom edge are connected. A narrow passage is formed between the two vertical beams. The hollow shaft passes through the narrow passage and is mounted on the horizontal beam and the vertical beam through the sealed box.

[0021] The hollow shaft is rotatably supported by the bearing in the sealed box. The bevel gear in the sealed box meshes with the bevel gear ring on the hollow shaft to transmit torque. The shaft on which the bevel gear is installed is connected to the reduction motor.

[0022] Furthermore, vertical crushing teeth 2 are distributed above the drum in the closed cavity to break up the condensed shell of steel slag.

[0023] Compared with the prior art, the advantages of the present invention are:

[0024] This invention provides a relatively closed, confined space processing device and its use method. This device effectively recovers the sensible heat energy carried by the slag while thermally crushing it with low energy consumption, providing enterprises with high-quality, high-temperature, and high-pressure steam for power generation and other production processes. This reduces investment in environmental protection equipment, lowers operating costs, and achieves additional economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a structural diagram of a steel slag thermal crushing waste heat recovery device;

[0026] Figure 2 Schematic diagram of medium flow direction; (arrows indicate medium flow direction)

[0027] Figure 3 It is a structural diagram of the slag hopper;

[0028] Figure 4 Schematic diagram of the tripod structure;

[0029] In the figure: 1-closed cavity; 1.1-slag inlet; 1.2-slag outlet; 1.3-first fluid channel; 2-top cover; 3-slag pot; 4-base; 5-scraper; 6-discharging door; 7-drum; 7.1-second fluid channel; 8-spiral lifting blade; 9-crushing tooth 1; 10-crushing tooth 2; 11-reduction motor; 12-sealing box; 13-bevel gear; 14-bevel gear ring; 15-casing; 16-chute; 17-crushing mechanism; 18-hollow shaft; 19-grid; 20-support column; 21-tripod; 21.1-crossbeam; 21.2-vertical beam. DETAILED DESCRIPTION

[0030] The following describes the implementation of the present invention through specific embodiments. People skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0031] See also Figures 1 to 4. It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Therefore, they have no substantive technical significance. Any modification of the structure, change in the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0032] like Figure 1 、 Figure 2 As shown: A steel slag thermal crushing waste heat recovery method includes a steel slag thermal crushing waste heat recovery device, and the steel slag thermal crushing waste heat recovery device includes a vertical closed chamber 1, a drum 7 and a sleeve 15.

[0033] The closed chamber 1 is provided with a slag inlet 1.1 and a slag outlet 1.2. The closed chamber 1 is covered by a first fluid channel 1.3. The inlet of the first fluid channel 1.3 is located at the lower part of the closed chamber 1 and the outlet is located at the upper part of the closed chamber 1. The inlet and outlet of the first fluid channel 1.3 are used to be connected to the medium circulation system.

[0034] The drum 7 is supported in the closed chamber 1 by a hollow shaft 18, which is connected to a rotary drive mechanism outside the closed chamber 1. Spiral lifting blades 8 are wound around the outer surface of the drum 7 from bottom to top in a circumferential direction, and crushing teeth 9 are arranged between the spiral lifting blades 8 and perpendicular to the drum axis. A second fluid channel 7.1 is attached to the inner wall of the drum 7, with the inlet of the second fluid channel 7.1 located at the lower part of the drum 7 and the outlet located at the upper part of the drum 7.

[0035] The sleeve 15 is connected to the inlet of the second fluid channel 7.1 through the outlet of the hollow shaft 18 from the outside of the closed cavity 1, and the outlet of the second fluid channel 7.1 is connected to the gap between the sleeve 15 and the hollow shaft 18; the outer pipe openings of the sleeve 15 and the hollow shaft 18 are used to connect to the medium circulation system.

[0036] The slag is fed into the closed chamber 1 from the slag inlet 1.1. The slag liquid level maintains a preset distance from the top surface of the closed chamber 1, forming radiation heat absorption. The side and bottom surfaces of the closed chamber 1 and the roller 7 are in contact with the slag, forming conduction heat absorption.

[0037] The rotary drive mechanism drives the drum 7 to rotate, and the spiral lifting blades 8 stir the steel slag and lift it upward. The lifted steel slag falls downward through the gap between the spiral lifting blades 8 and the inner wall of the closed chamber 1. The crushing teeth 9 are used to shear the steel slag when the drum 7 rotates, and the steel slag is evenly crushed while the first fluid channel 1.3 and the second fluid channel 7.1 fully absorb the residual heat of the steel slag.

[0038] The crushed and cooled steel slag is discharged from the slag outlet 1.2 of the closed chamber 1.

[0039] The drum 7 is shaped like a cylinder in the middle, with cones at the top and bottom. The sealed interlayer of the drum 7 forms a second fluid channel 7.1, which is connected to the outlet of the sleeve 15. This interlayer circulates a heat-absorbing medium, thereby absorbing heat from the slag. The heat-absorbing medium flows into the upper end of the sleeve 15, exits through two outlet holes connected to the sealed interlayer of the drum 7, then flows back into the hollow shaft 18 through the water inlet hole provided on the upper portion, and then exits through the upper end of the hollow shaft 18. The outer pipe openings of the sleeve 15 and the hollow shaft 18 are connected to a rotary seal joint, which connects to the medium circulation system.

[0040] A hollow shaft 18 passes through the drum 7, connected to the rotary drive mechanism at its upper end and concave at its lower end. A base 4 is mounted below the drum 7 within the enclosed chamber 1. The base 4 has a spherical upper surface that cooperates with the concave lower surface of the hollow shaft 18 to form a spherical joint support. The concave lower surface of the hollow shaft 18 cooperates with the spherical surface of the base to prevent slag from entering the running-in surface. The base 4 also serves to limit the drum 7, preventing it from deviating from the center while facilitating its rotation.

[0041] It also includes a slag pot 3 and a top cover 2. The top cover 2 and the slag pot 3 are buckled together to form a closed cavity 1 inside. The top cover 2 and the slag pot 3 are connected by bolts; the slag inlet 1.1 is provided on the top cover 2, and the slag outlet 1.2 is provided at the bottom of the slag pot 3; the hollow shaft 18 passes through the shaft sealing port of the top cover 2 to connect to the rotary drive mechanism, and the base 4 is embedded in the spherical surface of the bottom of the slag pot 3 and enters the closed cavity 1.

[0042] The inner wall of the slag tank 3 is preferably constructed of wear-resistant steel plate to prevent the slag from scratching the sealed tank. The slag tank 3 is preferably positioned vertically. The slag tank 3 can be cylindrical, with a funnel-shaped bottom that closes at the top. A slag outlet 1.2 is located on the slope of the bottom. A discharge door 6 is installed on the outside of the slag tank 3 to seal the slag outlet 1.2. The discharge door 6 is closed during slag inlet and opens during slag discharge. The slag to be processed is introduced into the slag tank 3 through the slag inlet 1.1 and, after processing, discharged through the slag outlet 1.2. A shell can also be provided on the outside of the slag tank 3. The shell can be made of either ordinary thin carbon steel or galvanized steel.

[0043] There are two implementations for closing the first fluid channel 1.3 outside the cavity 1.

[0044] In the first embodiment, the sealed interlayers of the slag pot 3 and the top cover 2 each form a first fluid channel 1.3. A medium inlet and a medium outlet are provided at opposite ends of the top cover 2 to extend the residence time of the heat-absorbing medium within the top cover 2. The heat-absorbing medium flows into the top cover 2 through the medium inlet and then flows out through the medium outlet. The base 4 includes an inlet channel 4.1 and multiple outlet channels 4.2 that connect to the first fluid channel 1.3 on the slag pot 3 and converge into the inlet channel 4.1.

[0045] The circulating medium in the first fluid channel 1.3 and the second fluid channel 7.1 can be low-pressure water, thermal oil, or molten salt. When flowing through the first fluid channel 1.3, the circulating medium removes heat from the slag pot 3 and the top cover 2. When flowing through the second fluid channel 7.1, the circulating medium removes heat from the drum 7. The circulating medium flows in from the bottom and out from the top, forcing it to flow through the height of the slag pot 3 and the drum 7, ensuring that the circulating medium flows through every channel position of the slag pot 3 and the drum 7.

[0046] In a second embodiment, pipes are arranged within the interlayers of the slag pot 3 and the top cover 2, with the gaps filled with thermally conductive material. The pipes form the first fluid channel 1.3. The thermally conductive material can be graphite or other materials with high thermal conductivity. The gaps between the pipes are completely filled, leaving no air gaps, which facilitates efficient absorption of heat from the high-temperature slag. Boiler pipes are preferably used as the pipes, as they are made of steel and are resistant to high temperatures and pressures. The pipes are preferably arranged in straight rows or in a spiral pattern.

[0047] The medium circulation system includes a steam drum. The circulating medium in the first fluid channel 1.3 and the second fluid channel 7.1 is water. When high-pressure water flows through the pipeline, the pipeline and the steam drum form a heat absorption system. The high-temperature steam generated enters the top radiation heat absorption area of ​​the closed chamber 1 for superheating. The generated high-temperature water continues to circulate in the pipeline to absorb heat; the superheated steam is sent to the steam turbine for power generation.

[0048] like Figure 3As shown, the slag receiving hopper also includes a crushing mechanism 17 mounted on its upper portion to crush the slag. A removable grate 19 is installed in the middle, and a chute 16 is formed at the lower portion, connecting to the slag inlet 1.1. This allows only liquid slag with a particle size smaller than the apertures of the grate 19 to enter the slag tank 3. Large slag that cannot be crushed can be directly lifted by a workshop crane and discharged to a designated area. This prevents large slag from entering the slag tank 3 and causing blockage, thereby improving crushing efficiency. The crushing mechanism preferably includes crushing plates and crushing teeth. The crushing plates are mounted on both sides of the slag receiving hopper, and the crushing teeth are mounted on the crushing plates and hydraulically apply a compressive force to the slag. In this arrangement, the two crushing plates are hydraulically driven to squeeze and crush the large slag blocks blocked by the grate 19, and the resulting small particles of slag fall through the grate apertures. The crushing teeth can be short, thick, conical teeth, which can exert greater clamping force, facilitate crushing, and are less susceptible to damage.

[0049] The slag agitation component includes spiral lifting blades 8 wound circumferentially from bottom to top around the drum 7, and crushing teeth 9 disposed between the spiral lifting blades 8 and perpendicular to the drum's axis. As hot liquid slag enters the slag pot 3, the drum 7 rotates and stirs the slag. During this stirring process, part of the liquid slag resides between the slag pot 3 and the drum 7, while part resides above the drum 7. The slag pot 3 is preferably sized to hold one to three pots of slag. In this embodiment, the spiral lifting blades 8 are preferably two. As the drum 7 rotates, the spiral lifting blades 8 simultaneously stir and lift the slag upward, with the lifted slag falling downward through the gap between the spiral lifting blades 8 and the inner wall of the slag pot 3. The crushing teeth 9 are used to shear the slag as the drum 7 rotates.

[0050] When the upper portion of the drum 7 is in close contact with the top cover 2 , vertical crushing teeth 10 are distributed above the drum 7 in the closed cavity 1 for breaking up the condensed shell of the steel slag.

[0051] When there is space between the upper portion of the drum 7 and the top cover 2, a portion of the liquid slag is trapped between the slag pot 3 and the hollow shaft 18. Crushing maces are positioned within the exposed area of ​​the hollow shaft 18 within the slag pot 3. The crushing maces are preferably arranged in a crosswise arrangement of three or symmetrically distributed four. The crushing maces are provided with at least one vertical crushing tooth. This allows the drum 7 to agitate the upper layer of slag and break up the crust formed on the slag surface due to cooling. In this embodiment, the hollow shaft 18 is equipped with reinforcing ribs for connecting the crushing mace to the hollow shaft 18. This arrangement strengthens the crushing mace, and the number of reinforcing ribs is not limited.

[0052] The drum 7 is also provided with a scraper 5 below to clean the bottom storage slag, and the slag is pushed to the slag outlet as the drum rotates. The scraper 5 bottom edge can be set to be sharper, which saves effort and is convenient to clean.

[0053] like Figure 4As shown: the rotary drive mechanism is supported by a support column 20 and a tripod 21. The support column 20 is attached to the outer wall of the slag pot 3. The support column 20 bears the weight of the tripod 21 and the connecting parts on the tripod 21. The tripod 21 is arranged above the top cover 2, and the three vertices are built on the support column 20.

[0054] The support column 20 is provided with a connecting piece, through which the support column 20 is connected to the slag pot 3. The number of connecting pieces of each support column 20 can be set to two, which are respectively connected close to the upper and lower sides of the slag pot 3. This setting is firm and reliable.

[0055] Inside the tripod 21 is a horizontal beam 21.1, parallel to the bottom edge. Two vertical beams 21.2, perpendicular to the horizontal beam 21.1, connect to the bottom edge. A narrow passage is formed between the two vertical beams 21.2. The hollow shaft 18 passes through the narrow passage and is supported by the sealing box 12, resting on the horizontal beam 21.1 and the vertical beams 21.2. This allows the weight of the drum 7 to be primarily borne by the tripod 21, reducing the load on the slag pot 2 and providing a simpler and more stable structure. The hollow shaft 18 is rotatably supported by bearings within the sealing box 12. The bevel gear 13 within the sealing box 12 meshes with the bevel gear ring 14 on the hollow shaft 18 to transmit torque. The shaft to which the bevel gear 13 is mounted is connected to the reduction motor 11.

[0056] Lifting ears can also be provided above the tripod 21 and installed at each corner of the tripod 21 for lifting, so that the device can be moved to a designated position as required.

[0057] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

Claims

1. A method for recovering waste heat from thermal crushing of steel slag, characterized by: The invention comprises a steel slag thermal crushing waste heat recovery device, which comprises a vertical closed chamber (1), a roller (7) and a sleeve (15); The closed cavity (1) is provided with a slag inlet (1.1) and a slag outlet (1.2); the closed cavity (1) is covered by a first fluid channel (1.3); the inlet of the first fluid channel (1.3) is located at the lower part of the closed cavity (1), and the outlet is located at the upper part of the closed cavity (1); the inlet and outlet of the first fluid channel (1.3) are used to be connected to a medium circulation system; The drum (7) is supported in the closed cavity (1) via a hollow shaft (18), the hollow shaft (18) being connected to a rotary drive mechanism outside the closed cavity (1), the outer surface of the drum (7) being wound with spiral lifting blades (8) from bottom to top in a circumferential direction, and crushing teeth (9) perpendicular to the drum axis are provided between the spiral lifting blades (8); a second fluid channel (7.1) is attached to the inner wall of the drum (7), the inlet of the second fluid channel (7.1) being located at the lower part of the drum (7), and the outlet being located at the upper part of the drum (7); The sleeve (15) is connected to the inlet of the second fluid channel (7.1) from the outside of the closed cavity (1) through the outlet of the hollow shaft (18), and the outlet of the second fluid channel (7.1) is connected to the gap between the sleeve (15) and the hollow shaft (18); the outer pipe openings of the sleeve (15) and the hollow shaft (18) are used to connect to the medium circulation system; The steel slag is fed into the closed chamber (1) from the slag inlet (1.1), and a preset distance is maintained between the liquid surface of the steel slag and the top surface of the closed chamber (1), thereby forming radiation heat absorption, and the side and bottom surfaces of the closed chamber (1) and the roller (7) are in contact with the steel slag, thereby forming conduction heat absorption; The rotary drive mechanism drives the drum (7) to rotate, and the spiral lifting blades (8) stir the steel slag and lift it upward. The lifted steel slag falls downward through the gap between the spiral lifting blades (8) and the inner wall of the closed chamber (1). The crushing teeth (9) are used to shear the steel slag when the drum (7) rotates, and the steel slag is evenly crushed while the first fluid channel (1.3) and the second fluid channel (7.1) fully absorb the residual heat of the steel slag. The crushed and cooled steel slag is discharged from the slag outlet (1.2) of the closed cavity (1).

2. The method for recovering waste heat from thermal crushing of steel slag according to claim 1, characterized in that: The hollow shaft (18) passes through the roller (7), the upper end of which is connected to the rotary drive mechanism, and the lower end of which is set as a concave surface. A base (4) is installed below the roller (7) in the closed cavity (1). The upper surface of the base (4) is a spherical surface, which cooperates with the concave surface of the lower end of the hollow shaft (18) to form a ball joint support.

3. The method for recovering waste heat from thermal crushing of steel slag according to claim 2, characterized in that: The steel slag thermal crushing waste heat recovery device further comprises a slag pot (3) and a top cover (2), wherein the top cover (2) and the slag pot (3) are engaged to form a closed chamber (1); The slag inlet (1.1) is provided on the top cover (2), and the slag outlet (1.2) is provided at the bottom of the slag tank (3); the hollow shaft (18) passes through the top cover (2) and is connected to the rotary drive mechanism, the base (4) is embedded in the bottom of the slag tank (3), and the spherical surface enters the closed cavity (1).

4. The method for recovering waste heat from thermal crushing of steel slag according to claim 3, characterized in that: Pipes are arranged in the interlayers of the slag pot (3) and the top cover (2), and gaps are filled with heat-conducting material; the pipes constitute a first fluid channel (1.3).

5. The method for recovering waste heat from thermal crushing of steel slag according to claim 1, characterized in that: The steel slag thermal crushing waste heat recovery device also includes a slag receiving hopper, and a crushing mechanism (17) is provided on the upper part of the slag receiving hopper to crush the steel slag; an unloadable grid (19) is installed in the middle part of the slag receiving hopper, and a chute (16) is formed at the lower part of the slag receiving hopper to connect to the slag inlet (1.1). The crushed small particles of steel slag fall through the grid holes, and the large pieces of steel slag that cannot be crushed are hoisted by lifting the grid (19) and unloaded to a designated area.

6. The method for recovering waste heat from thermal crushing of steel slag according to claim 1, characterized in that: A scraper (5) is also provided below the drum (7) to clean the steel slag stored at the bottom and push the steel slag to the slag outlet as the drum rotates.

7. The method for recovering waste heat from thermal crushing of steel slag according to claim 4, characterized in that: The bottom of the slag pot (3) is configured as a closed funnel, and the base (4) is located at the center of the funnel.

8. The method for recovering waste heat from thermal crushing of steel slag according to claim 3, characterized in that: The rotary drive mechanism is supported by a support column (20) and a tripod (21), the support column (20) being attached to the outer wall of the slag pot (3), the tripod (21) being arranged above the top cover (2), and the three vertices being built on the support column (20); A crossbeam (21.1) parallel to the bottom edge is provided in the tripod (21), two vertical beams (21.2) perpendicular thereto are connected between the crossbeam (21.1) and the bottom edge, a narrow passage is formed between the two vertical beams (21.2), and the hollow shaft (18) passes through the narrow passage and is mounted on the crossbeam (21.1) and the vertical beams (21.2) through the sealing box (12); The hollow shaft (18) is rotatably supported by a bearing in the sealing box (12), the bevel gear (13) in the sealing box (12) is engaged with the bevel gear ring (14) on the hollow shaft (18) to transmit torque, and the shaft on which the bevel gear (13) is mounted is connected to the reduction motor (11).

9. The method for recovering waste heat from thermal crushing of steel slag according to claim 1, characterized in that: A second vertical crushing tooth (10) is distributed above the roller (7) in the closed cavity (1) for breaking up the condensed shell of the steel slag.

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