A step tunnel granulation device and dry quenching furnace power generation system

Abstract

The application provides a step-by-step tunnel granulating device and a dry quenching furnace power generation system. The step-by-step tunnel granulating device comprises: a box body having an inlet and an outlet arranged along a material conveying direction; a grate bed unit having a plurality of grate plates arranged side by side and capable of reciprocating along a first direction; a driving unit arranged in an equal number with the grate bed unit and capable of selectively driving corresponding grate plates in the corresponding grate bed unit to move backward along the first direction; a heat exchange unit arranged in the box body and above the grate bed unit; and a limiting unit arranged in front of the moving direction of the corresponding grate plate to limit the forward movement distance of the grate plate. The step-by-step tunnel granulating device in the application adopts a step-by-step conveying mode, and large slag materials are gradually broken into small slag materials in the step-by-step connection. At the same time, the slag materials are further dispersed in each connection to avoid re-melting and adhesion, and the granulation is completed while the heat exchange is performed.

Description

Technical Field

[0001] This invention relates to the field of waste heat recovery technology, specifically to a step-tunnel granulation device and a dry quenching furnace power generation system. Background Technology

[0002] Molten steel slag or ore slag produced at the end of metallurgical processes needs to be granulated before it can be recovered from waste heat in a dry quenching furnace. Existing granulation technologies typically employ dry granulation and centrifugal granulation methods. For example, patent CN119530472A discloses a centrifugal granulation system for molten steel slag and waste heat recovery, using a centrifugal granulation chamber to granulate the molten steel slag into high-temperature solid steel slag particles. However, the molten slag in this patent exhibits a "fiber-drawing phenomenon" during centrifugation, producing a large amount of fibrous powder, which severely affects the subsequent granulation of slag and also causes heat loss, impacting power generation efficiency. For example, patent CN115537479A discloses a device and method for dry granulation of metallurgical slag and efficient recovery of waste heat. Although it does not produce the "stringing phenomenon" that exists in centrifugal granulation process, during the cooling and transportation process, the surface of the slag solidifies while the center remains molten during the cooling process. This causes the granulated slag to remelt and form large slag pieces, affecting the subsequent power generation efficiency. The fan cooling also consumes additional electrical energy, thereby reducing the net power generation. Summary of the Invention

[0003] The purpose of this invention is to provide a step-through tunnel granulation device and a dry quenching furnace power generation system, which can achieve step-by-step granulation while conveying slag, effectively avoiding back-melting adhesion.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a step-type tunneling granulation device, comprising: The housing has an inlet and an outlet arranged along the conveying direction; The enclosure includes multiple grate units arranged sequentially from back to front and from high to low within the housing. The rear half of the first grate unit is located outside the inlet, and the front half of the last grate unit is located outside the outlet. Adjacent grate units are arranged in a front-high, rear-low configuration. Each grate unit has multiple side-by-side grate plates that can reciprocate along a first direction. The first direction forms a first angle with the horizontal plane, and the grate plates can move forward along the first direction under the action of gravity. The driving unit is provided in the same number as the grate bed unit, and can selectively drive the corresponding grate plate in the corresponding grate bed unit to move backward in a first direction; A heat exchange unit is disposed in the housing and located above the grate unit; A limiting unit is provided in front of the corresponding grate plate in the direction of movement to limit the distance the grate plate can move forward.

[0005] Furthermore, the grate unit also includes a track, which is arranged parallel to the first direction, and the bottom of the grate unit is provided with rollers that can cooperate with the corresponding track.

[0006] Furthermore, the surface of the grate is provided with several raised ribs arranged side by side, the extending direction of the raised ribs is parallel to the first direction, the spacing between the raised ribs is 4-6cm, and the height is 3-5cm.

[0007] Furthermore, the drive unit includes a motor, a power distribution unit, a clutch unit, and a transmission unit; the main shaft of the motor is connected to the input end of the power distribution unit, the output end of the power distribution unit is connected to the input end of the clutch unit, the output end of the clutch unit is connected to the input end of the transmission unit, and the output end of the transmission unit is connected to the grate.

[0008] Furthermore, the power distribution unit includes a drive shaft as an input end, several driven shafts as output ends, and several distribution bevel gear sets for connecting the drive shaft and the driven shafts.

[0009] Furthermore, the transmission unit includes several transmission shafts as input ends, several racks as output ends, several spur gear sets, and several transmission bevel gear sets. The spur gear sets are connected to the corresponding racks, and the transmission bevel gear sets are connected to the corresponding spur gear sets and the corresponding transmission shafts. The spur gear sets can transmit power in one direction, and the racks are located at the bottom of the grate.

[0010] Furthermore, it also includes a buffer unit, which is disposed on one side of the limiting unit.

[0011] Furthermore, when the grate of one grate unit is at the front end and the grate of the previous grate unit is at the rear end, the grates of the two grate units partially overlap.

[0012] Furthermore, baffles are provided on both sides and the rear side of the grate.

[0013] The present invention also provides a dry quenching furnace power generation system, comprising: A step-through tunnel granulation device, wherein the step-through tunnel granulation device is one of the above-mentioned step-through tunnel granulation devices; A slag transfer device, located at the end of the step tunnel granulation device, has a transfer bucket capable of receiving slag falling from the grate of the last grate unit. A dry quenching furnace power generation device, the dry quenching furnace power generation device having a dry quenching furnace for receiving slag discharged from the transfer bucket.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1) The stepping tunnel granulation device in this invention adopts a stepping conveying method. During the stepping connection, large pieces of slag are broken into small pieces of slag step by step. At the same time, the slag can be further dispersed at each connection to avoid remelting and sticking. Granulation is completed while heat exchange is performed.

[0015] 2) The stepping tunnel granulation device in this invention uses inertia to achieve stepping conveying. The grate automatically slides down under the action of gravity and stops at the end point. The slag falls onto the grate of the next grate bed unit under the action of inertia and forms small pieces of slag after multi-stage conveying.

[0016] 3) The step-type tunnel granulation device in this invention uses the inertial conveying of slag generated during step-by-step connection, which can avoid slag residue on the grate plate and improve the granulation effect of subsequent slag. Attached Figure Description

[0017] Figure 1 This is a simplified schematic diagram of the system of the present invention (arrows indicate directions); Figure 2 This is a three-dimensional structural view of the step-tunnel granulation device of the present invention; Figure 3 for Figure 2 A magnified view of a section at point A in the middle; Figure 4 for Figure 2 A magnified view of a section at point B in the middle; Figure 5 for Figure 2 The front view of the step tunnel granulation device shown. Figure 6 for Figure 5 A magnified view of a section at point C; Figure 7 for Figure 5 Structural sectional view along the central II direction; Figure 8 for Figure 7 A magnified view of a section at point D.

[0018] Reference numerals in the attached drawings: 1. Stepping tunnel granulation device; 2. Box body; 3. Grate bed unit; 4. Drive unit; 5. Heat exchange unit; 6. Limiting unit; 7. Grate plate; 8. Track; 9. Roller; 10. Baffle; 11. Rib; 12. Motor; 13. Power distribution unit; 14. Clutch unit; 15. Transmission unit; 16. Drive shaft; 17. Driven shaft; 18. Distribution bevel gear set; 19. Transmission shaft; 20. Rack; 21. Spur gear set; 22. Transmission bevel gear set; 23. Bearing seat; 24. Material and slag transfer device; 25. Dry quenching furnace power generation device; 26. Transfer bucket; 27. Dry quenching furnace; 28. Inlet; 29. ​​Outlet. Detailed Implementation

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example 1

[0020] like Figures 1 to 7 As shown, this embodiment discloses a step-through tunnel granulation device 1, including: a housing 2, a grate bed unit 3, a drive unit 4, a heat exchange unit 5, and a limiting unit 6.

[0021] The front end of the box 2 is provided with an outlet 29 and the rear end is provided with an inlet 28. The box 2 is a trapezoidal structure with a length of 10-15m, a width of 2-2.5m, and a maximum height of 4-5m.

[0022] Multiple grate units 3 are arranged sequentially from back to front and from high to low within the housing 2, forming a step-by-step conveying system. Taking five grate units 3 as an example, the first grate unit 3 is the starting point of the conveying process, and the fifth grate unit 3 is the ending point. The rear half of the first grate unit 3 is located outside the inlet 28 and is used to receive the molten slag discharged from the end of the metallurgical production line. The front half of the fifth grate unit 3 is located outside the outlet 29 and is used to convey the granulated slag to the transfer bucket 26.

[0023] The two adjacent grate units 3 are arranged in a front-high-back-low configuration, meaning that the height of the five grate units 3 gradually decreases along the conveying direction.

[0024] The grate unit 3 includes grate plates 7 and tracks 8. The number of grate plates 7 is determined by their dimensions. In this example, the width of the grate plate 7 is 600mm and the length is 2000mm. Therefore, each grate unit 3 can be equipped with 3 grate plates 7, which are arranged side by side. Rollers 9 are provided at the bottom of each grate plate 7. Multiple sets of tracks 8 are also provided corresponding to the grate plates 7 and are parallel to the first direction. The grate plates 7 can move back and forth on the tracks 8 through the rollers 9 at the bottom. The angle between the first direction and the horizontal plane is 1-2°. As a preferred example, the angle is 2°. The purpose of the inclined track 8 is to allow the grate plates 7 to slide forward to the front end only under the action of gravity. Baffles 10 are provided on both sides and the rear side of the grate plates 7. The height of the baffles 10 is 5-10cm, and their purpose is to reduce the outward splashing of broken slag.

[0025] The drive unit 4 is provided in equal numbers to the grate bed unit 3, and can selectively drive the corresponding grate plate 7 in the grate bed unit 3 to move backward along the first direction. Since the forward movement of the grate plate 7 is driven by a component force generated by gravity, the drive unit 4 only needs to provide power for the backward movement of the grate plate 7. In the reciprocating motion of the grate plate 7, only the backward movement requires power, and the load on the grate plate 7 when moving backward is smaller than the load when moving forward, thus reducing the energy consumption of the drive unit 4.

[0026] As a preferred example, the drive unit 4 includes a motor 12, a power distribution unit 13, a clutch unit 14, and a transmission unit 15. The main shaft of the motor 12 is connected to the input end of the power distribution unit 13, the output end of the power distribution unit 13 is connected to the input end of the clutch unit 14, the output end of the clutch unit 14 is connected to the input end of the transmission unit 15, and the output end of the transmission unit 15 is connected to the grate plate 7.

[0027] As a preferred embodiment, the power distribution unit 13 includes a drive shaft 16 as an input end, a driven shaft 17 as an output end, and a distribution bevel gear set 18 for connecting the drive shaft 16 and the driven shaft 17. There is one drive shaft 16, and three driven shafts 17 and three distribution bevel gear sets 18. The central axis of the drive shaft 16 is perpendicular to the side of the housing 2. The drive unit 4 is installed outside the housing 2 to prevent the electrical components from being affected by the high temperature generated by the slag. The power distribution unit 13 distributes the power output from one motor 12 to the three driven shafts 17, thereby driving the three grate plates 7 respectively. All five power distribution units 13 are located on the rear side of the housing 2 and are installed and fixed sequentially from high to low.

[0028] As a preferred example, the gear ratio of the bevel gear set 18 is 3-5:1, thereby increasing the output torque.

[0029] As a preferred example, the transmission unit 15 includes a transmission shaft 19 as the input end, a rack 20 as the output end, a spur gear set 21 for connecting the corresponding rack 20, and a transmission bevel gear set 22 for connecting the spur gear set 21 and the corresponding transmission shaft 19. There are three transmission shafts 19, racks 20, spur gear sets 21, and transmission bevel gear sets 22. The transmission shaft 19 is installed through the housing 2, and its central axis is parallel to the central axis of the drive shaft 16. Since the grate units 3 are arranged sequentially from high to low in the conveying direction, the lengths of the transmission shafts 19 of different transmission units 15 are different, and their ends all extend outside the housing 2 and are connected to the driven shaft 17 of the corresponding power distribution unit 13 via a clutch. The transmission shaft 19 can adopt a segmented structure, that is, multiple short transmission shaft segments are connected by couplings to form a long transmission shaft 19, which reduces the installation difficulty. The spur gear set 21 is rotatably mounted inside the housing 2 via bearing seat 23. The rack 20 is positioned at the bottom of the grate 7, and the spur gear set 21 is located below the grate 7, with its output wheel meshing with the rack 20. Its input wheel is connected to the corresponding drive shaft 19 via a corresponding transmission bevel gear set 22. The output wheel in the spur gear set 21 is mounted via a one-way bearing, enabling unidirectional power transmission. That is, when the motor 12 drives the grate 7 to move backward, the output wheel in the spur gear set 21 can transmit power normally; however, when the grate 7 moves forward, the output wheel will not transmit power in the reverse direction, ensuring the grate 7 slides normally.

[0030] As a preferred example, the clutch unit 14 is an electromagnetic clutch.

[0031] As a preferred example, the gear ratio of the transmission bevel gear set 22 is 3-5:1, and the transmission ratio of the spur gear set 21 is 2-3:1. After two-stage reduction, the output torque is further improved, so a smaller power motor 12 can be selected to reduce costs.

[0032] The heat exchange unit is located in the housing 2 and above the grate unit 3. The heat exchange unit includes heat exchange tubes and heat exchange fins; the heat exchange tubes are serpentine tubes that pass through the heat exchange fins. The function of the heat exchange unit is to absorb some heat to solidify the slag material, while simultaneously heating the deionized water inside the tubes, thereby reducing the temperature difference of the steam phase change in the dry quenching power generation process and further improving power generation efficiency.

[0033] The limiting unit 6 is positioned in front of the corresponding grate plate 7 in the direction of movement to limit the forward movement distance of the grate plate 7. When the grate plate 7 moves forward under the action of gravity, it needs to stop at the end of its stroke. Therefore, when the grate plate 7 hits the limiting unit 6, it cannot continue to move forward. At the same time, due to the inertia generated by stopping, the slag it carries will continue to move forward, thereby achieving conveying. The limiting unit 6 can be a limiting seat or a limiting rod, which is fixedly installed inside and outside the housing 2 at corresponding positions to limit the grate plate 7.

[0034] Since the ultimate goal of granulation is to produce small slag pieces, thereby maximizing heat release and improving power generation efficiency, a preferred embodiment of granulation is to provide several parallel-distributed ribs 11 on the surface of the grate plate 7. The ribs 11 extend parallel to the first direction, with a spacing of 4-6 cm and a height of 3-5 cm. Due to the presence of the ribs 11 on the surface of the grate plate 7, when molten slag is poured onto it, it is supported in a disc-like shape. After the slag solidifies, its structure is fixed, and its thickness varies depending on its location. Therefore, after sliding from one grate plate 7 to the next, it will break at the thinner section. The ribs 11 are evenly distributed, resulting in more uniformly sized fragments after breakage. This impact not only breaks large slag pieces into smaller ones but also generates even finer particles. These particles can be recycled and not used in subsequent power generation processes. This granulation method produces a small amount of debris, so the heat loss caused by the debris is negligible.

[0035] As a preferred example, to prevent the grate 7 from being damaged further due to long-term impact with the limiting unit 6, this example also includes a buffer unit, which is located on one side of the limiting unit 6. The buffer unit is a spring; the grate 7 first contacts the spring to reduce its speed, and then the limiting unit 6 prevents it from coming to a complete stop in the latter half of its stroke.

[0036] As a preferred example, in order to ensure that the slag material falls onto the next grate 7 as much as possible after being thrown forward, the grate 7 of two adjacent grate bed units 3 are arranged in the following manner: when the grate 7 of one grate bed unit 3 is at the front end and the grate 7 of the previous grate bed unit 3 is at the rear end, the grate 7 of the two grate bed units 3 partially overlap. Example 2

[0037] The present invention also provides a dry quenching furnace power generation system, comprising: a walking tunnel granulation device 1, a slag transfer device 24, and a dry quenching furnace power generation device 25.

[0038] The walking tunnel granulation device 1 is the walking tunnel granulation device 1 in Embodiment 1. The slag transfer device 24 is located at the end of the walking tunnel granulation device 1, and it has a transfer bucket 26 capable of receiving the slag falling from the grate 7 of the last grate unit 3. The dry quenching furnace power generation device 25 has a dry quenching furnace 27 for receiving the slag discharged from the transfer bucket 26.

[0039] Working principle and process of the present invention Molten slag at 1000℃ generated in the metallurgical process is poured onto the three grate plates 7 of the first grate unit 3, with only one pouring operation performed at a time. Then, the clutches corresponding to the three grate plates 7 disengage sequentially, and the grate plates 7 slide forward under gravity, stopping at their endpoints. The slag is thrown out by inertia and falls onto the preceding grate plate 7, where it continues to be conveyed. The clutch corresponding to the grate plate 7 that has finished throwing the slag re-engages, and the grate plate 7 moves backward and returns to its initial position under the drive of the motor 12. The grate plates 7 in each grate unit 3 slide down and return sequentially under the control of the clutches, achieving step-by-step conveying of the slag. As the slag is conveyed between different grate plates 7, it gradually cools and solidifies, and upon falling onto the next grate plate 7, it breaks into smaller fragments, thus completing granulation.

[0040] It should be noted that the movement sequence of the three grate plates 7 in each grate unit 3 can be either simultaneous forward movement followed by simultaneous backward movement, or sequential movement. That is, the first grate plate 7 slides forward first, reaches its endpoint, and immediately moves backward to its reset position, while the second grate plate 7 begins to slide forward, and so on, forming a sequential movement. This movement is achieved using the clutch unit 14. When the clutch unit 14 is disengaged, the grate plate 7 slides downward; when the clutch unit 14 is engaged, the grate plate 7 moves upward. Throughout the entire process, the motor 12 always runs in one direction. The movement position of all grate plates 7 is detected by limit switches. When the corresponding limit switch is triggered, an action signal is generated. This action signal is further sent to the controller, which in turn generates a control signal to control the action of the clutch unit 14. This is a conventional method and will not be elaborated further.

[0041] Each time slag is dumped, it must be ensured that the slag is spread on the grate 7 in a way that is not too large, too small, too thin or too thick, with a thickness of 5-6 cm being appropriate. The optimal amount of slag to be dumped each time can be determined based on the conveying speed and the size of the grate 7, which will not be elaborated here.

[0042] The dry quenching furnace power generation device 25 includes a dry quenching furnace 27 for receiving slag discharged from the transfer bucket 26. After the slag enters the dry quenching furnace 27, the waste heat is used to heat the inert gas, and the waste heat is recovered through equipment such as heat exchangers and boilers to generate electricity. Similarly, since the dry quenching furnace power generation device 25 is also prior art, this invention does not involve improvements to this device, and therefore the specific structure will not be described in detail. For example, the dry quenching furnace power generation device disclosed in patent application number 2014800431890 can be used. Since the water temperature in the walking tunnel granulation device 1 can be raised from room temperature to above 90°C after radiant heating, it can be used to generate steam in the subsequent power generation stage of the dry quenching furnace 27, reducing the temperature difference and increasing the net power generation. Therefore, the outlet of the heat exchange unit 5 of the walking tunnel granulation device 1 can be connected to the boiler in the dry quenching furnace 27 through a pipeline.

[0043] Experiments show that, based on a slag discharge rate of 250t / h in the laterite nickel smelting process, the recovered heat can produce 70t of superheated steam with parameters of 3.8MPa and 450℃. The planned power generation is 16,000 kWh, and the system consumes 10% of its own power, resulting in an actual net power generation of 14,400 kWh.

[0044] It should be noted that the control part in this invention is prior art, and therefore will not be described in detail.

[0045] Any aspects of this invention not described in detail are well-known to those skilled in the art.

[0046] In the description of this invention, it should be understood that the terms "upper," "lower," "left," and "right," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or a specific orientational structure and operation. Therefore, they should not be construed as limitations on the invention. Furthermore, "first" and "second" are only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0047] In the description of this invention, unless otherwise stated, "a plurality of" means two or more. It should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0048] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art should understand that modifications and equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A step-type tunneling granulation device, characterized in that: include: The box (2) has an inlet (28) and an outlet (29) arranged along the conveying direction; A grate unit (3) is provided, and multiple grate units (3) are arranged in the box (2) from back to front and from high to low. The rear half of the first grate unit (3) is located outside the inlet (28), and the front half of the last grate unit (3) is located outside the outlet (29). Adjacent grate units (3) are arranged in a front-high-back-low configuration. The grate unit (3) has multiple grate plates (7) arranged side by side and capable of reciprocating along a first direction. The first direction forms a first angle with the horizontal plane. The grate plates (7) can move forward along the first direction under the action of gravity. The grate unit (3) also includes a track (8), which is arranged parallel to the first direction. The bottom of the grate unit (3) is provided with rollers (9) that can cooperate with the corresponding track (8). A drive unit (4) is provided in the same number as the grate bed unit (3), and can selectively drive the corresponding grate plate (7) in the corresponding grate bed unit (3) to move backward in a first direction; the drive unit (4) includes a motor (12), a power distribution unit (13), a clutch unit (14), and a transmission unit (15); the main shaft of the motor (12) is connected to the input end of the power distribution unit (13), the output end of the power distribution unit (13) is connected to the input end of the clutch unit (14), the output end of the clutch unit (14) is connected to the input end of the transmission unit (15), and the output end of the transmission unit (15) is connected to the grate plate (7); A heat exchange unit (5) is disposed in the housing (2) and located above the grate unit (3); A limiting unit (6) is provided in front of the corresponding grate plate (7) in the direction of movement to limit the distance the grate plate (7) can move forward.

2. The step-tunnel granulation device according to claim 1, characterized in that: The surface of the grate (7) is provided with a number of parallel ribs (11), the extension direction of the ribs (11) is parallel to the first direction, the spacing of the ribs (11) is 4-6cm, and the height is 3-5cm.

3. The step-tunnel granulation device according to claim 1, characterized in that: The power distribution unit (13) includes a drive shaft (16) as an input end, a plurality of driven shafts (17) as output ends, and a plurality of distribution bevel gear sets (18) for connecting the drive shaft (16) and the driven shafts (17).

4. The step-type tunnel granulation device according to claim 1, characterized in that: The transmission unit (15) includes several transmission shafts (19) as input ends, several racks (20) as output ends, several spur gear sets (21) and several transmission bevel gear sets (22). The spur gear sets (21) are connected to the corresponding racks (20), and the transmission bevel gear sets (22) are connected to the corresponding spur gear sets (21) and the corresponding transmission shafts (19). The spur gear sets (21) can transmit power in one direction, and the racks (20) are located at the bottom of the grate plate (7).

5. The step-tunnel granulation device according to claim 1, characterized in that: It also includes a buffer unit, which is disposed on one side of the limiting unit (6).

6. The step-tunnel granulation device according to claim 1, characterized in that: When the grate plate (7) of one of the grate units (3) is at the front end and the grate plate (7) of the previous grate unit (3) is at the back end, the grate plates (7) of the two grate units (3) partially overlap.

7. The step-tunnel granulation device according to claim 1, characterized in that: Baffles (10) are provided on both sides and the rear side of the grate (7).

8. A dry quenching furnace power generation system, characterized in that: include: A step-through tunnel granulation device (1), wherein the step-through tunnel granulation device (1) is a step-through tunnel granulation device (1) as described in claim 1. The slag transfer device (24) is located at the end of the step tunnel granulation device (1) and has a transfer bucket (26) capable of receiving slag falling from the grate (7) of the last grate unit (3). The dry quenching furnace power generation device (25) has a dry quenching furnace (27) for receiving slag discharged from the transfer bucket (26).

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