Dry quenching furnace power generation system based on slag granulation

Abstract

The invention provides a dry quenching furnace power generation system based on slag granulation. A tunnel type cooling device is provided with a box body and a heat exchange group arranged in the box body; the chain type conveying device penetrates through the tunnel type cooling device and is provided with a plurality of material trays capable of circularly reciprocating, and the material trays can enter from one end of the box body and exit from the other end of the box body; the material slag transfer device is located at the tail end of the chain type conveying device and is provided with a transfer barrel capable of receiving material slag falling from the material disc; the dry quenching furnace power generation device is provided with a dry quenching furnace used for receiving slag discharged from the transfer barrel. Molten slag is spread in the charging tray through the charging tray, uniform temperature reduction is facilitated, meanwhile, the slag is conveyed into the tunnel type cooling device to be subjected to heat exchange and cooling through the circulating reciprocating motion characteristic of the chain type conveying device, heat released by temperature reduction can be recycled, temperature reduction can be controlled by controlling the conveying speed, and the cooling efficiency is improved. And the slag can be uniformly solidified, and anti-melting is avoided.

Description

Technical Field

[0001] This invention relates to the field of waste heat recovery technology, specifically to a dry quenching furnace power generation system based on slag granulation. Background Technology

[0002] Since slag or steel slag produced during metallurgical processes is in a molten state and carries a large amount of heat energy, failure to effectively recover and utilize this heat energy will result in waste. Patent CN119530472A discloses a centrifugal granulation treatment and waste heat recovery system for molten steel slag, using a centrifugal granulation chamber to centrifuge molten steel slag into high-temperature solid steel slag particles. However, the molten slag in this patent exhibits a "stringing phenomenon" during centrifugation, producing a large amount of fibrous powder, severely affecting subsequent slag granulation and causing heat loss, thus impacting power generation efficiency. Patent CN115537479A discloses a dry granulation device and method for metallurgical molten slag and efficient waste heat recovery. While it avoids the "stringing phenomenon" present in centrifugal granulation processes, during cooling and conveying, although the slag surface solidifies, the center remains molten, causing the already granulated slag to remelt into large slag chunks, affecting subsequent power generation efficiency. Furthermore, the use of fans for cooling during the granulation process increases energy consumption. Summary of the Invention

[0003] The purpose of this invention is to provide a dry quenching furnace power generation system based on slag granulation, which can improve the granulation quality and thus improve the power generation efficiency of subsequent processes.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a dry quenching power generation system based on slag granulation, comprising: A tunnel-type cooling device, the tunnel-type cooling device having a housing and a heat exchange assembly disposed within the housing; A chain conveyor that passes through the tunnel cooling device has multiple reciprocating material trays that can enter from one end of the housing and exit from the other end of the housing. A slag transfer device, located at the end of the chain conveyor, has a transfer bucket capable of receiving slag falling from the material tray. 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.

[0005] Furthermore, the tunnel-type cooling device is equipped with an inlet pipe on the feeding side and an outlet pipe on the discharging side. The inner end of the inlet pipe is connected to a water distribution tank, and the inner end of the outlet pipe is connected to a water collection tank. The heat exchange group is connected between the water distribution tank and the water collection tank.

[0006] Furthermore, the water outlet pipe is connected to the heat flow pipe of the dry quenching furnace power generation device via a pipeline.

[0007] Furthermore, the chain conveyor also has a frame and a chain conveyor belt mounted on the frame, with the material trays equidistantly arranged on the chain conveyor belt and moving back and forth with it.

[0008] Furthermore, the bottom of the material tray is provided with a connecting rod and a support wheel. The connecting rod is located at the center of the bottom of the material tray and is hinged to the chain conveyor belt. The frame is provided with an upper rail and a lower rail. When the material tray is in a horizontal conveying state, the support wheel at its bottom can form a rolling engagement with the upper rail or the lower rail.

[0009] Furthermore, the upper track is provided with an upper guide bend at its starting end, and the lower track is provided with a lower guide bend at its starting end.

[0010] Furthermore, a vibrating device for vibrating the overturned material tray is provided on the frame outside the discharge side of the box; the vibrating device includes a vibrating motor and a cam mechanism; the cam of the cam mechanism is horizontally rotatably mounted on the frame, and its driven rod is vertically slidably mounted on the frame; the vibrating motor is mounted on the frame and drives the cam, and a vibrating hammer is provided at the bottom of the driven rod.

[0011] Furthermore, the cam mechanism is provided in two parts, and the vibrating motor drives the cams in the two cam mechanisms through a chain transmission mechanism, thereby driving the two driven rods to move in opposite directions.

[0012] Furthermore, the surface of the tray has several grooves.

[0013] Furthermore, a counterweight is provided at the rear bottom of the material tray.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1) This invention utilizes a material tray to spread molten slag in the tray, which facilitates uniform temperature drop. At the same time, the reciprocating motion of the chain conveyor device is used to transport the slag to the tunnel cooling device for heat exchange and cooling, which can recover the heat released by the temperature drop. In addition, the temperature drop can be controlled by controlling the conveying speed to ensure that the slag can be solidified uniformly and avoid back melting.

[0015] 2) The tunnel cooling device in this invention uses radiative heat exchange, which can avoid the situation where the surface of the molten slag cools and solidifies rapidly but the interior remains molten, and requires no electrical energy input, thus increasing net power generation.

[0016] 3) The chain conveyor in this invention is equipped with a vibration device. By vibrating the material tray at the unloading position, the solidified residue on the material tray can be effectively removed, thus avoiding the residue from having an adverse effect on subsequent loading.

[0017] 4) The material tray in this invention has grooves of the same size, which can cause the solidified slag to fall off under gravity and be crushed into granular slag of similar size under impact during unloading, thereby facilitating waste heat recovery in the dry quenching furnace. Attached Figure Description

[0018] Figure 1 This is a system flowchart of the present invention; Figure 2 This is a three-dimensional structural view of the cooling process in this invention; Figure 3 for Figure 2 A side view of the cooling system shown (arrows indicate the direction of movement); Figure 4 for Figure 2 Rear view of the cooling system shown; Figure 5 for Figure 4 Structural sectional view along the central II direction; Figure 6 This is a three-dimensional structural view of the chain conveyor device in this invention; Figure 7 for Figure 6 A magnified view of a section at point A in the middle; Figure 8 for Figure 6 A side view of the chain conveyor shown. Figure 9 for Figure 8 Structural sectional view along line II-II; Figure 10 for Figure 8 Cross-sectional view of the structure along line III-III.

[0019] Reference numerals: 1. Tunnel-type cooling device; 2. Box body; 3. Heat exchange group; 4. Inlet pipe; 5. Outlet pipe; 6. Water distribution tank; 7. Water collection tank; 8. Chain conveyor device; 9. Frame; 10. Chain conveyor belt; 11. Material tray; 12. Connecting rod; 13. Support wheel; 14. Upper track; 15. Lower track; 16. Upper guide bend; 17. Lower guide bend; 18. Vibrating device; 19. Vibrating motor; 20. Cam mechanism; 21. Driven rod; 22. Vibrating hammer; 23. Chain mechanism; 24. Counterweight; 25. Groove; 26. Material and slag transfer device; 27. Transfer bucket; 28. Dry quenching furnace; 29. ​​Heat exchange tube; 30. Heat exchange fins. Detailed Implementation

[0020] 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.

[0021] like Figures 1 to 10 As shown, this embodiment discloses a dry quenching furnace power generation system based on slag granulation, including a tunnel cooling device 1, a chain conveying device 8, a slag transfer device 26, and a dry quenching furnace power generation device.

[0022] The tunnel-type cooling device 1 is 8-14 meters long, and its heat exchange group 3 uses radiative heat exchange to heat the liquid medium. Specifically, the tunnel-type cooling device 1 includes a housing 2, a heat exchange group 3, an inlet pipe 4, and an outlet pipe 5. The heat exchange group 3 is located inside the housing 2. One end of the housing 2 has a feed inlet, and the other end has a discharge outlet. The inlet pipe 4 is located at the top of the feed side of the housing 2, and the outlet pipe 5 is located at the top of the discharge side of the housing 2. The inlet pipe 4 can be connected to the municipal water supply network or to the cold flow pipeline of the dry quenching furnace power generation unit. The outlet pipe 5 can be connected to the hot flow pipeline 30 connected to the dry quenching furnace power generation unit or to the hot flow pipeline of other heating links in the production process. One end of the inlet pipe 4 extending into the housing 2 is connected to the water distribution tank 6, and similarly, one end of the outlet pipe 5 extending into the housing 2 is connected to the water collection tank 7. Both the water distribution tank 6 and the water collection tank 7 are provided with several connection ports. The heat exchange group 3 includes several heat exchange tubes 29 and heat exchange fins 30 for all heat exchange tubes 29 to pass through. The two ends of the heat exchange tubes 29 are respectively connected to the connection ports on the corresponding sides.

[0023] The chain conveyor 8 is 12-20 meters long and passes through the tunnel-type cooling device 1. Its loading and unloading positions are both located outside the box 2. Specifically, the chain conveyor 8 includes a frame 9, a chain conveyor belt 10, an upper track 14, a lower track 15, and a material tray 11.

[0024] Multiple material trays 11 are evenly spaced, preferably 20. Each material tray 11 is rectangular, with a length, width, and height of 60cm, 150cm, and 5cm, respectively. Since the moving component of the chain conveyor belt 10 is a chain, the connection between the material trays 11 and the chain is as follows: a connecting rod 12 is horizontally positioned at the bottom center of the material tray 11, with its centerline perpendicular to the direction of movement of the material tray 11. Connecting seats are installed on the chain links at equal intervals, and each connecting rod 12 is hinged to a corresponding pair of connecting seats.

[0025] Two support wheels 13 are provided on the front and rear sides of the bottom of the material tray 11, for a total of four support wheels 13. Similarly, the frame 9 is provided with an upper rail 14 and a lower rail 15. When the material tray 11 receives material at the beginning and moves to the end under the drive of the chain, its support wheels 13 cooperate with the upper rail 14 to make the material tray 11 move in a straight line in the horizontal direction. Similarly, when the material tray 11 moves to the end to unload material, it moves back to the beginning under the drive of the chain. Since the material tray 11 rotates 180° with the chain during unloading, the bottom support wheel 13 of the rotated material tray 11 will cooperate with the lower rail 15 to make it move in a straight line in the horizontal direction again. It should be noted that the lengths of the upper rail 14 and the lower rail 15 should meet the following conditions: at the beginning and end positions of the path of the material tray 11, when the material tray 11 is just in a horizontal state, the end of the rail only contacts the near support wheel 13 of the material tray 11, while the far support wheel 13 is disengaged from the corresponding rail. The purpose of this design is to facilitate the flipping of the material tray 11.

[0026] The material tray 11 moves horizontally under the drive of a chain, receiving molten slag produced in the metallurgical process at the loading station. This slag can be steel slag or mineral slag, and its temperature is typically 1000℃. After being loaded into the tray 11, it enters the box 2 through the inlet. During its movement, the slag radiates heat to the outside, thus heating the heat exchange medium, while its own temperature decreases. Finally, it exits the box 2 through the outlet. After cooling, the temperature of the slag will reach approximately 900℃. It can be seen that the temperature drop of the slag in this stage is 100℃, and the cooling time is relatively long. This helps the slag cool down evenly and avoids the situation where the surface solidifies while the center remains molten.

[0027] The slag transfer device 26 is located at the end of the chain conveyor 8, and it has a transfer bucket 27 capable of receiving slag falling from the slag tray 11. At the end of the chain conveyor, i.e., when the slag tray 11 moves to the unloading position, the slag tray 11 flips over and unloads into the transfer bucket 27 of the transfer device, and the transfer bucket 27 then transfers the granulated slag to the dry quenching furnace 28. Since the slag transfer device 26 is prior art, this invention does not involve improvements to this device, and therefore its specific structure will not be described in detail.

[0028] The dry quenching furnace power generation device includes a dry quenching furnace 28 for receiving the slag discharged from the transfer bucket 27. After the slag enters the dry quenching furnace 28, 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 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 device disclosed in patent application number 2014800431890 is used. Since the water temperature rises from room temperature to above 90°C after radiant heating in the tunnel cooling device, it can be used to generate steam in the subsequent dry quenching furnace power generation stage, reducing the temperature rise difference and increasing the net power generation. Therefore, the outlet pipe 5 of the tunnel cooling device 1 can be connected to the boiler in the dry quenching furnace device through a pipeline.

[0029] Because the slag will adhere to the material tray 11 after solidification, forming residual slag, excessive accumulation of this slag will affect the uniform cooling of the slag. Therefore, it needs to be removed during unloading. For this purpose, as a preferred embodiment, the frame 9 is equipped with a vibrating device 18. The vibrating device 18 is set on the frame 9 at the unloading position of the material tray 11, thereby vibrating the overturned material tray 11 to shake off the residual slag. The vibrating device 18 includes a vibrating motor 19 and a cam mechanism 20; the cam of the cam mechanism 20 is horizontally rotatably mounted on the frame 9, and its driven rod 21 is vertically slidably mounted on the frame 9. The vibrating motor 19 is mounted on the frame 9 and drives the cam, and a vibrating hammer 22 is provided at the bottom of the driven rod 21. The cam mechanism 20 is prior art, and under the rotation of the cam, it drives the driven rod 21 to reciprocate in the vertical direction. It should be noted that the vibration frequency and duration of the vibration device 18 can be determined according to the actual situation, while the running interval can be determined according to the moving speed of the material tray 11, so that the vibration device 18 is activated when the material tray 11 reaches the position.

[0030] As a preferred example, to improve the vibration effect, two cam mechanisms 20 are provided. The vibration motor 19 drives the cams in the two cam mechanisms 20 through a chain transmission mechanism, which in turn drives the two driven rods 21 to move in opposite directions. That is, the two driven rods 21 alternately vibrate the material tray 11 with opposite motion states, thereby increasing the vibration frequency.

[0031] As another way to reduce slag residue, the surface of the material tray 11 can be improved. Specifically, the surface of the material tray 11 has several grooves 25. The grooves 25 are distributed in a rectangular array, and the size and spacing of the grooves 25 are 4cm-6cm. In this way, after the slag solidifies, the joints between the slag parts located in the grooves 25 are relatively weak and easily broken by impact, thereby transforming large pieces of slag into granular slag with relatively uniform shape and size. More specifically, the shape of the grooves 25 is preferably square or spherical.

[0032] To induce a certain degree of oscillation in the material tray 11 during vibration, thereby better dislodging residual material, a counterweight 24 is preferably provided at the rear bottom of the material tray 11. With the counterweight 24, the weight of the front and rear parts of the material tray 11 is unbalanced. Thus, after the material tray 11 is flipped, the rear side of the material tray 11 will be subjected to the vibration force on its front side and will tilt upwards, then fall downwards after the vibration force disappears. This causes the material tray 11 to swing back and forth within a certain range, much like a seesaw. Because the rear side of the material tray 11 is heavier during flipping due to the counterweight 24, to facilitate better coordination between the rear support wheel 13 and the track, an upper guide bend 16 is preferably provided at the beginning of the upper track 14, and a lower guide bend 17 is preferably provided at the beginning of the lower track 15. The curved portions of the upper guide bend 16 and the lower guide bend 17 are concentrically arranged with the sprockets of the chain conveyor belt 10, and their horizontal portions are connected to the corresponding tracks, thereby enabling the support wheel 13 to roll onto the tracks with the help of its guiding action. Both the upper guide bend 16 and the lower guide bend 17 are metal strips with a diameter of 1 cm.

[0033] Working principle and process of the present invention Molten slag at 1000°C generated during the metallurgical process is poured into a loading tray 11 located at the loading station. The tray 11 then moves to a tunnel cooling device 1 to cool to 900°C, during which the molten slag gradually solidifies. When the tray 11 reaches the unloading station at the end, it flips over, unloading the solidified slag into a transfer bucket 27 of the transfer device. Large pieces of slag falling into the transfer bucket 27 are crushed into granular slag by impact. Afterward, the tray 11 returns to the beginning for loading, while the transfer bucket 27 is transported above the dry quenching furnace 28, and the slag is poured into the dry quenching furnace 28 for waste heat power generation.

[0034] Experiments show that, based on a slag discharge rate of 250t / h in the metallurgical process, the recovered heat can produce 95t of superheated steam with parameters of 3.8MPa and 450℃. The planned power generation is 22,000kWh, the system consumes 18% of its own power, and the actual net power generation is 18,040kWh.

[0035] It should be noted that the control part in this invention is prior art, and therefore will not be described in detail.

[0036] Any aspects of this invention not described in detail are well-known to those skilled in the art.

[0037] 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.

[0038] 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.

[0039] 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 dry quenching power generation system based on slag granulation, characterized in that: include: A tunnel cooling device (1) having a housing (2) and a heat exchange assembly (3) disposed within the housing (2). A chain conveyor (8) passes through the tunnel cooling device (1) and has multiple reciprocating trays (11) that can enter from one end of the box (2) and exit from the other end of the box (2). The slag transfer device (26) is located at the end of the chain conveyor (8) and has a transfer bucket (27) capable of receiving slag falling from the material tray (11). A dry quenching furnace power generation device, the dry quenching furnace power generation device having a dry quenching furnace (28) for receiving the slag discharged from the transfer bucket (27).

2. The dry quenching power generation system based on slag granulation according to claim 1, characterized in that: The tunnel cooling device (1) has a box (2) with an inlet pipe (4) on the feeding side and an outlet pipe (5) on the discharging side. The inner end of the inlet pipe (4) is connected to a water distribution tank (6), and the inner end of the outlet pipe (5) is connected to a water collection tank (7). The heat exchange group (3) is connected between the water distribution tank (6) and the water collection tank (7).

3. A dry quenching power generation system based on slag granulation according to claim 2, characterized in that: The water outlet pipe (5) is connected to the heat flow pipe of the dry quenching furnace power generation device via a pipeline.

4. A dry quenching power generation system based on slag granulation according to claim 1, characterized in that: The chain conveyor (8) also has a frame (9) and a chain conveyor belt (10) set on the frame (9), and the trays (11) are equidistantly arranged on the chain conveyor belt (10) and move back and forth with it.

5. A dry quenching power generation system based on slag granulation according to claim 4, characterized in that: The bottom of the tray (11) is provided with a connecting rod (12) and a support wheel (13). The connecting rod (12) is located at the center of the bottom of the tray (11) and is hinged to the chain conveyor belt (10). The frame (9) is provided with an upper rail (14) and a lower rail (15). When the tray (11) is in a horizontal conveying state, the support wheel (13) at its bottom can form a rolling engagement with the upper rail (14) or the lower rail (15).

6. A dry quenching power generation system based on slag granulation according to claim 5, characterized in that: The upper rail (14) is provided with an upper guide bend (16) at its beginning, and the lower rail (15) is provided with a lower guide bend (17) at its beginning.

7. A dry quenching power generation system based on slag granulation according to claim 6, characterized in that: A vibrating device (18) for vibrating the overturned tray (11) is provided on the frame (9) outside the discharge side of the box (2); the vibrating device (18) includes a vibrating motor (19) and a cam mechanism (20); the cam of the cam mechanism (20) is horizontally rotated and mounted on the frame (9), and its driven rod (21) is vertically slidably mounted on the frame (9); the vibrating motor (19) is mounted on the frame (9) and drives the cam, and a vibrating hammer (22) is provided at the bottom of the driven rod (21).

8. A dry quenching power generation system based on slag granulation according to claim 7, characterized in that: The cam mechanism (20) is provided in two parts. The vibrating motor (19) drives the cams in the two cam mechanisms (20) through the chain transmission mechanism and drives the two driven rods (21) to move in opposite directions.

9. A dry quenching power generation system based on slag granulation according to claim 7, characterized in that: The surface of the tray (11) is provided with several grooves (25).

10. A dry quenching power generation system based on slag granulation according to claim 7, characterized in that: A counterweight (24) is provided at the bottom rear of the tray (11).

Images