A molten slag waste heat recovery device

Abstract

The utility model discloses a kind of molten slag waste heat recovery devices, it is related to waste heat recovery technical field, the utility model includes base, the top of base is equipped with heating tank, the inside of heating tank is provided with molten slag tank, the inside of molten slag tank is installed with stirring pipe, the top end of stirring pipe extends to the top of heating tank, and the bottom end of stirring pipe extends to the bottom of molten slag tank, the outer surface of stirring pipe is connected with water pipe;The utility model can absorb the heat in molten slag tank after molten slag enters into heating tank, at the same time, circulating pump extracts water in heating tank by pumping pipe, water enters into rotating pipe by water pipe, and then shunt into multiple water pipes, and water pipe is located in the inside of molten slag tank, to make water flow directly into molten slag inside to absorb the heat accumulated in central region, break the limitation of traditional indirect heat exchange, make heat energy recovery more sufficient.

Description

Technical Field

[0001] This utility model relates to the field of waste heat recovery technology, specifically to a waste heat recovery device for molten slag. Background Technology

[0002] Currently, in the field of pyrometallurgical slag waste heat recovery, a large amount of high-temperature slag is generated during the production of pyrometallurgical slag. At present, most of these slags are still treated by water quenching or hot blanching. The disadvantage is that the sensible heat of the slag cannot be recovered and utilized. As my country's economic development model shifts from resource consumption to environmental friendliness, the effective treatment and utilization of these solid wastes is an important research topic for metallurgists.

[0003] Existing technology discloses a waste heat recovery device for hot slag with patent number CN220304326U. The device includes a waste heat recovery box, an internal cooling box, and a support column at the bottom of the cooling box. The cooling box is fixed to the bottom of the waste heat recovery box via the support column. A feed pipe is connected to the top of the cooling box, extending to the outside of the waste heat recovery box at one end. A stirring assembly is installed inside the cooling box, and a drive motor for rotating the stirring assembly is located at the top of the waste heat recovery box. A discharge pipe is connected to the bottom of the cooling box, extending to the outside of the waste heat recovery box, and a discharge valve is installed on the discharge pipe. A spray assembly is provided between the waste heat recovery box and the cooling box, and a drain pipe is connected to the side wall of the waste heat recovery box. This invention not only occupies a small area but also recovers and utilizes the heat energy in the hot slag. However, when this waste heat recovery device uses molten slag to heat water, since the water is only wrapped around the cooling tank and there is a cooling tank between them, the heat in the molten slag in the center of the cooling tank is difficult to exchange quickly with the water in the waste heat recovery tank. Although there is a stirring component, its stirring range and force are limited (there are large gaps between the stirring rods and between the stirring rods and the inner wall of the cooling tank). It can only disturb the molten slag in a local area of ​​the cooling tank and cannot make the high-temperature molten slag in the center of the tank fully contact the inner wall of the cooling tank. As a result, the heat exchange efficiency between water and molten slag is low and the heat energy recovery is insufficient. This not only prolongs the hot slag treatment cycle but also increases energy waste, making it difficult to meet the actual needs of industrial production for waste heat recovery efficiency and processing rate. Utility Model Content

[0004] Therefore, the purpose of this utility model is to provide a molten slag waste heat recovery device to solve the technical problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A base is included, with a heating tank at its top. A slag tank is located inside the heating tank, and a stirring tube is installed inside the slag tank. The top end of the stirring tube extends to the top of the heating tank, and the bottom end extends to the bottom of the slag tank. A water distribution pipe connects to the outer surface of the stirring tube. A feeding pipe extending into the slag tank passes through one side of the top of the heating tank. A crushing trough connects to the top of the feeding pipe. Two sets of crushing rollers are installed inside the crushing trough, and a worm gear is fixed to one end of each set of crushing rollers. A motor is installed at the top of the heating tank, and a worm gear is connected to the output end of the motor. A driving wheel is fixed to the outer surface of the worm gear. A driven wheel is located above the outer surface of the stirring tube, and a transmission belt is provided on the outer surfaces of the driving and driven wheels. A circulation pump is installed on one side of the top of the heating tank. A water inlet pipe connects to the inlet end of the circulation pump, and a water delivery pipe connects to the outlet end of the circulation pump. One end of the water delivery pipe is connected to the stirring tube via a rotary joint.

[0006] Furthermore, a gearbox is provided on one side of the crushing tank, and the worm extends into the interior of the gearbox and meshes with two sets of worm wheels.

[0007] By adopting the above technical solution, the worm gear meshes with two sets of worm wheels to form a transmission structure, which can drive two sets of crushing rollers to rotate stably in opposite directions. This meshing transmission is precise and synchronized, which can ensure that large pieces of molten slag are crushed evenly. The gearbox can protect the worm wheels and worm gear, and prevent impurities from adhering to the worm wheels and worm gear and causing jamming.

[0008] Furthermore, the outer surface of the slag pot is permeated with several sets of heat-conducting plates, and the heat-conducting plates are made of copper.

[0009] By adopting the above technical solution, several sets of copper heat-conducting plates can quickly conduct heat from the molten slag inside the tank by taking advantage of copper's excellent thermal conductivity. At the same time, the multiple sets increase the heat exchange area, which can accelerate the outward transfer of heat energy, improve the overall heat recovery efficiency, and make fuller use of heat energy.

[0010] Furthermore, the heating tank has a water inlet at the top and a drain pipe running through one side of the heating tank.

[0011] By adopting the above technical solution, the water inlet at the top of the heating tank can replenish cold water in a timely manner, and the drain pipe on one side can easily discharge the hot water after heat absorption. The two form the inlet and outlet channels of water circulation, which can ensure that there is enough water in the tank to maintain continuous heat exchange, while making it easy to control the water temperature and water volume, and ensuring the stable operation of the heat recovery system.

[0012] Furthermore, the bottom of the slag pot is permeated with a slag discharge pipe extending to the bottom of the heating pot.

[0013] By adopting the above technical solution, the slag discharge pipe can directly discharge the molten slag after heat exchange treatment.

[0014] Furthermore, a temperature sensor is installed at the bottom of the interior of the heating tank, and a control panel is installed on the top of the heating tank. The temperature sensor, motor, and circulation pump are all electrically connected to the control panel.

[0015] By adopting the above technical solution, the temperature sensor can monitor the water temperature inside the tank in real time and then display the temperature on the control panel, which can control the motor and water pump.

[0016] Furthermore, the water distribution pipe is provided in four sets, and all four sets of water distribution pipes are in a serpentine bend shape. The water distribution pipes are made of copper-beryllium alloy material.

[0017] By adopting the above technical solutions, the water distribution pipe adopts a serpentine bend design, which can significantly extend the water flow path and increase the contact surface area with the molten slag. The four sets of distribution can make the water flow evenly cover different areas in the molten slag tank, avoiding heat exchange dead zones. The copper-beryllium alloy accelerates heat transfer with its excellent thermal conductivity and extends the life of components with its good wear resistance, thus improving the heat recovery efficiency and the durability of the device.

[0018] Furthermore, the outer surfaces of both the water pipe and the heating tank are covered with an insulation layer made of mineral wool.

[0019] By adopting the above technical solutions, the excellent thermal insulation properties of mineral wool can be used to reduce heat loss, which can not only maintain the stability of the hot water temperature in the water supply pipe and the heat exchange environment in the heating tank, but also reduce heat loss and further improve the overall heat recovery and utilization rate.

[0020] Furthermore, the bottom of the base is provided with an anti-slip rubber layer.

[0021] By adopting the above technical solution, the anti-slip rubber layer can increase the friction with the placement surface by taking advantage of the high friction characteristics of rubber, effectively preventing the device from sliding due to vibration or external force during operation, ensuring the stability of the equipment placement, ensuring that the coordinated work of each component is not disturbed by displacement, and improving operational safety.

[0022] In summary, the present invention has the following main advantages: 1. This utility model utilizes a motor, worm gear, worm wheel, crushing tank, and crushing rollers. When molten slag is added to the slag pot, the motor rotates, causing the worm gear to rotate. The rotation of the worm gear drives two sets of crushing rollers to rotate in opposite directions. This process can crush molten slag with larger diameters, allowing for the full release of heat from the molten slag. Simultaneously, the crushed molten slag particles are smaller and have a significantly increased surface area, greatly increasing the contact area with subsequent heat exchange components and effectively improving heat exchange efficiency. Furthermore, the transmission method of the worm gear and worm wheel is smooth and has a precise transmission ratio, ensuring the synchronicity and stability of the two sets of crushing rollers rotating in opposite directions. This results in more uniform crushing of the molten slag, avoiding the problems of heat accumulation and insufficient release caused by large molten slag residue. In addition, the crushed granular molten slag is easier to flow and disperse in the slag pot, reducing local heat exchange dead zones caused by the accumulation of large slag particles, improving the overall waste heat recovery rate of the device, and reducing energy waste. 2. Based on the above-mentioned configuration, this utility model further includes a water distribution pipe, a rotating pipe, a circulating pump, a water extraction pipe, and a water delivery pipe. After the molten slag enters the heating tank, the water can absorb the heat inside the molten slag tank. At the same time, the circulating pump draws water from inside the heating tank through the water extraction pipe. The water enters the rotating pipe through the water delivery pipe and is then distributed into multiple water distribution pipes. The water distribution pipe is located inside the molten slag tank, allowing the water to directly penetrate into the molten slag to absorb the heat accumulated in the central area. This breaks the limitations of traditional indirect heat exchange, allowing for more complete heat recovery. Furthermore, the motor drives the worm gear to rotate... While rotating, the rotating tube can be driven to rotate synchronously with the cooperation of the driving wheel, the driven wheel and the transmission belt. The rotation of the rotating tube can make the water distribution tube rotate accordingly. On the one hand, the rotational motion greatly increases the contact range and frequency between the water distribution tube and the molten slag, avoiding the problem of heat exchange saturation caused by local water flow contacting the same area for a long time. On the other hand, the rotating water distribution tube can continuously agitate the molten slag, break the accumulation state between particles, promote the rapid dissipation of internal high temperature heat to the surface, realize all-round three-dimensional heat exchange, and better meet the actual needs of industrial production. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the cross-sectional structure of the heating tank of this utility model; Figure 3 This is a schematic diagram of the stirring tube structure of this utility model; Figure 4 This is a schematic diagram of the cross-sectional structure of the stirring tube of this utility model; Figure 5 This is a schematic diagram of the crushing roller structure of this utility model; Figure 6 This is a schematic diagram of the slag melting tank structure of this utility model.

[0024] In the diagram: 1. Base; 2. Heating tank; 3. Feed pipe; 4. Crushing tank; 5. Gearbox; 6. Motor; 7. Water inlet; 8. Control panel; 9. Circulating pump; 10. Water supply pipe; 11. Stirring pipe; 12. Slag tank; 13. Water distribution pipe; 14. Water pumping pipe; 15. Slag discharge pipe; 16. Rotary joint; 17. Crushing roller; 18. Worm gear; 19. Driving wheel; 20. Driven wheel; 21. Drive belt; 22. Worm gear; 23. Heat-conducting plate; 24. Drain pipe; 25. Temperature sensor. Detailed Implementation

[0025] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0026] The embodiments of this utility model will be described below based on its overall structure.

[0027] Example 1: A waste heat recovery device for molten slag, such as Figures 1-6As shown, the device includes a base 1 with an anti-slip rubber layer at its bottom. This layer, utilizing the high friction of rubber, increases the friction with the surface it's placed on, effectively preventing slippage due to vibration or external forces during operation. This ensures stable placement of the equipment, guarantees the coordinated operation of all components without displacement interference, and improves operational safety. A heating tank 2 is located on the top of the base 1, with a water inlet 7 at its top. A drain pipe 24 runs through one side of the heating tank 2. The water inlet 7 at the top of the heating tank 2 allows for timely replenishment of cold water, while the drain pipe 24 facilitates the discharge of hot water after heat absorption. These two components form a water circulation channel, ensuring sufficient water in the tank to maintain continuous heat exchange. This design facilitates the control of water temperature and flow, ensuring stable operation of the heat recovery system. The heating tank 2 contains a slag tank 12, inside which is installed a stirring tube 11. The top end of the stirring tube 11 extends to the top of the heating tank 2, and the bottom end extends to the bottom of the slag tank 12. A water distribution pipe 13 is connected to the outer surface of the stirring tube 11. Four sets of water distribution pipes 13 are provided, each with a serpentine bend. The water distribution pipes 13 are made of copper-beryllium alloy. The serpentine bend design of the water distribution pipes 13 significantly extends the water flow path and increases the contact surface area with the molten slag. The four sets of distribution pipes ensure even water coverage. Different areas within the slag pot 12 are designed to avoid heat exchange dead zones. Copper-beryllium alloy, with its excellent thermal conductivity, accelerates heat transfer, and its good wear resistance extends component life, collectively improving heat recovery efficiency and device durability. A feed pipe 3 extends through one side of the top of the heating tank 2 into the interior of the slag pot 12. The top of the feed pipe 3 is connected to a crushing trough 4. Two sets of crushing rollers 17 are installed inside the crushing trough 4, and a worm gear 22 is fixed to one end of each set of crushing rollers 17. A motor 6 is installed on the top of the heating tank 2, and a worm gear 18 is connected to the output end of the motor 6. A drive wheel 19 is fixed to the outer surface of the worm gear 18. A drive wheel 19 is located above the outer surface of the stirring tube 11. The rotating wheel 20, the driving wheel 19 and the driven wheel 20 are provided with a transmission belt 21 on their outer surfaces. A circulation pump 9 is installed on one side of the top of the heating tank 2. The water inlet of the circulation pump 9 is connected to a water pumping pipe 14. The water outlet of the circulation pump 9 is connected to a water delivery pipe 10. One end of the water delivery pipe 10 is connected to the stirring pipe 11 through a rotary joint 16. The outer surfaces of the water delivery pipe 10 and the heating tank 2 are covered with an insulation layer made of mineral wool. The excellent insulation properties of mineral wool reduce heat loss, which can maintain the stability of the hot water temperature in the water delivery pipe 10 and the heat exchange environment in the heating tank 2, reduce heat loss, and further improve the overall heat recovery and utilization rate.

[0028] See Figure 1In the above embodiment, a gearbox 5 is provided on one side of the crushing tank 4, and the worm 18 extends into the interior of the gearbox 5 and meshes with two sets of worm wheels 22. The meshing of the worm 18 and the two sets of worm wheels 22 forms a transmission structure, which can drive the two sets of crushing rollers 17 to rotate stably in opposite directions. This meshing transmission is precise and synchronized, which can ensure that large pieces of molten slag are crushed evenly. The gearbox 5 can protect the worm wheels 22 and the worm 18 to prevent impurities from adhering to the worm wheels 22 and the worm 18 and causing jamming.

[0029] See Figures 1-2 In the above embodiment, the bottom of the slag pot 12 is provided with a slag discharge pipe 15 extending to the bottom of the heating pot 2, and the slag discharge pipe 15 can directly discharge the molten slag after heat exchange treatment.

[0030] See Figure 2 In the above embodiment, a temperature sensor 25 is installed at the bottom of the interior of the heating tank 2, and a control panel 8 is installed on the top of the heating tank 2. The temperature sensor 25, the motor 6, and the circulating pump 9 are all electrically connected to the control panel 8. The temperature sensor 25 can monitor the water temperature in the tank in real time and then display the temperature on the control panel 8. The control panel 8 can control the motor 6 and the water pump.

[0031] Example 2: To further improve the heat exchange effect between the molten slag and water, Example 2 is an improvement on Example 1. (See attached document for details.) Figure 2 and Figure 6 The outer surface of the slag pot 12 is permeated with several sets of heat-conducting plates 23, which are made of copper. With the help of the excellent thermal conductivity of copper, the several sets of copper heat-conducting plates 23 can quickly conduct the heat of the molten slag in the pot. At the same time, the multiple sets increase the heat exchange area, which can accelerate the heat transfer to the outside, improve the overall heat recovery efficiency, and make the heat energy utilization more efficient.

[0032] The implementation principle of this utility model is as follows: After the operator starts the motor 6 through the control panel 8, cold water is first injected through the water inlet 7 at the top of the heating tank 2. The motor 6 starts running and drives the worm gear 18 to rotate. The worm gear 18 extends into the gearbox 5 and meshes with two sets of worm wheels 22, driving two sets of crushing rollers 17 in the crushing tank 4 to rotate in opposite directions. At this time, the operator pours the molten slag into the crushing tank 4. The crushing rollers 17 uniformly crush the large pieces of molten slag. The crushed molten slag enters the slag tank 12 through the feed pipe 3. The copper heat-conducting plate 23 on the outer surface of the slag tank 12 simultaneously conducts the heat inside the tank to the water in the heating tank 2. On the other hand, the worm gear 18 drives the drive wheel 19 to rotate. The driven wheel 19 drives the driven wheel 20 and the stirring tube 11 to rotate synchronously via the transmission belt 21, causing the four-part water distribution pipe 13 on the outer surface of the stirring tube 11 to rotate inside the slag tank 12. At the same time, the circulation pump 9 starts, drawing water from the heating tank 2 through the water pumping pipe 14, sending it into the stirring tube 11 through the water delivery pipe 10 and the rotary joint 16, and then diverting it into the serpentine water distribution pipe 13. The rotating water distribution pipe 13 not only fully contacts the crushed molten slag to absorb heat, but also agitates the molten slag. After absorbing heat, the water in the water distribution pipe 13 flows back to the heating tank through the stirring tube 11, forming a cycle of heat absorption. After the residual heat is absorbed, the workers can discharge the molten slag through the slag discharge pipe.

[0033] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not intended to limit the invention. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the present invention, provided that such modifications, substitutions, and variations are within the scope of the claims of the present invention and are protected by patent law.

Claims

1. A molten slag waste heat recovery device comprising a base (1), characterized in that: The base (1) has a heating tank (2) on top, and a slag tank (12) is installed inside the heating tank (2). A stirring tube (11) is installed inside the slag tank (12). The top end of the stirring tube (11) extends to the top of the heating tank (2), and the bottom end of the stirring tube (11) extends to the bottom of the slag tank (12). A water distribution pipe (13) is connected to the outer surface of the stirring tube (11). A feeding pipe (3) extends through one side of the top of the heating tank (2) and into the slag tank (12). A crushing trough (4) is connected to the top of the feeding pipe (3). Two sets of crushing rollers (17) are installed inside the crushing trough (4), and one end of each set of crushing rollers (17) is fixed. There is a worm gear (22), a motor (6) is installed on the top of the heating tank (2), the output end of the motor (6) is connected to a worm (18), the outer surface of the worm (18) is fixed with a driving wheel (19), the outer surface of the stirring tube (11) is provided with a driven wheel (20), and the outer surfaces of the driving wheel (19) and the driven wheel (20) are provided with a transmission belt (21). A circulation pump (9) is installed on one side of the top of the heating tank (2), the inlet end of the circulation pump (9) is connected to a water pumping pipe (14), the outlet end of the circulation pump (9) is connected to a water supply pipe (10), and one end of the water supply pipe (10) is connected to the stirring tube (11) through a rotary joint (16).

2. The fused slag heat recovery device according to claim 1, characterized by: A gearbox (5) is provided on one side of the crushing tank (4), and the worm (18) extends into the interior of the gearbox (5) and meshes with two sets of worm wheels (22).

3. The fused slag heat recovery device according to claim 1, characterized by: The outer surface of the slag pot (12) is perforated with several sets of heat-conducting plates (23), and the heat-conducting plates (23) are made of copper material.

4. The fused slag heat recovery device according to claim 1, characterized by: The heating tank (2) has a water inlet (7) at the top and a drain pipe (24) through one side of the heating tank (2).

5. The fused slag heat recovery device according to claim 1, characterized by: The bottom of the slag pot (12) is permeated by a slag discharge pipe (15) extending to the bottom of the heating pot (2).

6. The fused slag heat recovery device according to claim 1, characterized by: A temperature sensor (25) is installed inside the lower part of the heating tank (2), and a control panel (8) is installed on the top of the heating tank (2). The temperature sensor (25), the motor (6) and the circulation pump (9) are all electrically connected to the control panel (8).

7. The fused slag heat recovery device according to claim 1, characterized by: The water distribution pipe (13) is provided in four sets, and all four sets of the water distribution pipe (13) are in a serpentine bend shape. The water distribution pipe (13) is made of copper-beryllium alloy material.

8. The molten slag waste heat recovery device according to claim 1, characterized in that: The outer surfaces of the water pipe (10) and the heating tank (2) are both covered with an insulation layer made of mineral wool.

9. The molten slag waste heat recovery device according to claim 1, characterized in that: The bottom of the base (1) is provided with an anti-slip rubber layer.

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