Integrated heat recovery device for blast furnace slag

Abstract

The application relates to an integrated heat recovery device for blast furnace slag and relates to the technical field of pyrometallurgy. The heat recovery device comprises a circulating heat exchange device, a bearing table, a rotary drive mechanism arranged on the upper side of the bearing table, an annular flow channel coaxially arranged on the upper side of the bearing table and used for containing a heat exchange medium, a molten slag output device arranged above the bearing table and used for outputting a high-temperature slag flow towards the annular flow channel, a granulation device arranged between the molten slag output device and the bearing table and used for crushing the high-temperature slag flow into small slag flow droplets, a slag discharge device arranged in the annular flow channel and used for intercepting solid slag particles, a medium heat exchange device arranged in the annular flow channel and used for recovering heat, and fixed supports arranged at intervals on the outer side of the bearing table, wherein the slag discharge device, the granulation device and the medium heat exchange device are connected with the fixed supports. The application can improve the comprehensive heat recovery efficiency of the heat recovery device.

Description

Technical Field

[0001] This application relates to the technical field of pyrometallurgy, and in particular to an integrated heat recovery device for blast furnace slag. Background Technology

[0002] In pyrometallurgical production, blast furnaces are typically used to smelt iron ore. During this process, in addition to producing valuable liquid metal, a large amount of blast furnace slag is also generated. Blast furnace slag is generally in the form of a molten, high-temperature slag flow. This blast furnace slag contains high-grade sensible heat resources. After proper treatment and cooling into solid slag particles, it can be used as a high-quality raw material for building materials such as cement.

[0003] Currently, heat recovery devices are commonly used to recover and utilize the sensible heat of blast furnace slag while simultaneously producing high-quality solid slag particles. Among existing technologies, a high-temperature lava heat recovery method and system have emerged. This system utilizes liquid metal as the heat exchange medium, introducing high-temperature slag flow and the heat exchange medium into a mixing tank for mixing. The high-temperature slag flow transfers heat to the heat exchange medium and cools and solidifies to form solid slag particles. Then, taking advantage of the fact that the density of the heat exchange medium is much greater than that of the slag particles, the slag particles float on the surface of the liquid heat exchange medium. Afterwards, a skimmer automatically separates and discharges the slag particles from the heat exchange medium, while the heat-absorbing heat exchange medium flows into a heat exchange pool for heat recovery.

[0004] To achieve the recycling of the heat exchange medium, a high-temperature pump is often installed in the heat exchange tank, and a circulation pipe is installed between the high-temperature pump and the front end of the mixing tank. When the high-temperature pump is operating, it pumps the heat exchange medium from the heat exchange tank back into the mixing tank through the circulation pipe, maintaining the continuous flow and recycling of the heat exchange medium. However, since the mixing tank generally requires a relatively long length to ensure sufficient cooling of the slag flow, the distance between the heat exchange tank at the end and the inlet of the mixing tank at the front is relatively large, necessitating the use of a long circulation pipe. Consequently, when the heat exchange medium is transported within the circulation pipe, the long circulation pipe not only increases the heat dissipation surface area of ​​the heat exchange medium, leading to unintended heat loss, but also reduces the overall heat recovery efficiency of the heat recovery device. Summary of the Invention

[0005] This application provides an integrated heat recovery device for blast furnace slag, the purpose of which is to improve the overall heat recovery efficiency of the heat recovery device.

[0006] The integrated heat recovery device for blast furnace slag provided in this application adopts the following technical solution: An integrated heat recovery device for blast furnace slag includes a circulating heat exchange device, a support platform, an annular flow channel coaxially formed on the upper side of the support platform for accommodating heat exchange medium, a rotary drive mechanism for driving the support platform to rotate, a molten slag output device located above the support platform for outputting high-temperature slag flow into the annular flow channel, a granulation device located between the molten slag output device and the support platform for breaking the high-temperature slag flow output by the molten slag output device into fine slag droplets that fall into the annular flow channel, a slag discharge device located within the annular flow channel for intercepting and discharging solid slag particles floating on the heat exchange medium, a medium heat exchange device located within the annular flow channel for recovering heat from the heat exchange medium, and a fixed support frame spaced apart on the outer side of the support platform. The slag discharge device, the granulation device, and the medium heat exchange device are all connected to the fixed support frame.

[0007] By adopting the above technical solution, the rotating drive mechanism drives the carrier platform to rotate, thereby causing the heat exchange medium in the annular flow channel to be transported in a circumferential manner.

[0008] During the blast furnace slag processing, the molten slag output device outputs a high-temperature slag stream. This stream is then broken into slag droplets by a granulation device and falls into an annular flow channel. At this point, the slag droplets come into contact with the heat exchange medium and are carried and directionally transported by it. During this process, the slag droplets exchange heat with the heat exchange medium, releasing heat and rapidly solidifying into solid slag particles, while the heat exchange medium absorbs heat and heats up. The heat exchange medium then continues to directionally transport the solid slag particles. When the heat exchange medium carrying the solid slag particles reaches the slag discharge device, the device intercepts and discharges the solid slag particles, while the heat exchange medium continues its directional transport.

[0009] Throughout the process, an external medium is continuously introduced into the heat exchanger, thereby continuously absorbing heat from the heat exchange medium and achieving heat recovery.

[0010] With this design, since the heat exchange medium is located only within the annular flow channel, and the annular flow channel is difficult to clog, the possibility of malfunction in the heat recovery device can be reduced, thereby improving the long-term operational stability of the heat recovery device. At the same time, because the heat exchange medium is always within the annular flow channel, the heat exchange between the heat exchange medium and the external environment is reduced, thereby reducing unnecessary heat loss and improving the overall heat recovery efficiency of the heat recovery device.

[0011] Optionally, the granulation device includes a rectifier, which is vertically arranged and located between the molten slag output device and the support platform in the vertical direction. A granulator is provided at the lower end of the rectifier. The rectifier is used to guide the high-temperature slag stream output by the molten slag output device into the annular flow channel. The granulator is used to break the high-temperature slag stream discharged from the rectifier into fine slag droplets and let them fall into the annular flow channel.

[0012] By adopting the above technical solution, the high-temperature slag stream is first processed by a rectifier before entering the granulator. The rectifier can stabilize and guide the high-temperature slag stream output from the molten slag output device, eliminate fluctuations and turbulence in the upstream material, and ensure that the high-temperature slag stream entering the granulator has a stable flow velocity and regular shape. This provides the granulator with an ideal material for crushing, thereby improving the uniformity of the slag droplet size after crushing in the granulator, and further improving the consistency of the final slag droplet cooling effect.

[0013] Optionally, the rectifier includes a feed pipe, an intermediate tank, and a discharge pipe. The intermediate tank is vertically arranged. One end of the feed pipe is connected to the molten slag output device, and the other end is connected to the intermediate tank. The discharge pipe is located at the bottom of the intermediate tank, and its upper end is connected to the intermediate tank, while its lower end is arranged towards the annular flow channel.

[0014] By adopting the above technical solution, the high-temperature slag flows into the intermediate tank through the feed pipe. The intermediate tank acts as a buffer and liquid storage tank, and it can form a certain liquid level inside, thereby establishing a stable static pressure head at the inlet of the discharge pipe. This ensures that regardless of fluctuations in the upstream molten slag flow rate, the slag flowing out of the discharge pipe maintains a constant flow rate and pressure, further improving the stability of the granulation process.

[0015] Optionally, the granulator includes a rotary driver and a granulation turntable. The granulation turntable is horizontally arranged and located below the discharge pipe. The lower end of the discharge pipe faces the granulation turntable. The rotary driver is coaxially connected to the granulation turntable and is used to drive the granulation turntable to rotate.

[0016] By adopting the above technical solution, a rotary drive is used to drive the granulation disc to rotate at high speed. When the high-temperature slag flows out of the discharge pipe and falls onto the granulation disc, under the action of centrifugal force, the high-temperature slag is spread out, accelerated, and torn and thrown out from the edge of the disc, forming fine atomized droplets. This mechanical centrifugal granulation method has high crushing energy, precise particle size control, and can increase the specific surface area of ​​the slag flow, thereby enhancing the heat exchange effect.

[0017] Optionally, the granulator includes a fluid source and an annular tube. The fluid source is connected to the annular tube, which is located below the discharge pipe and is coaxially arranged with the discharge pipe. A plurality of nozzles are provided on the annular tube, and the plurality of nozzles are arranged sequentially at intervals along the circumference of the annular tube, with all the nozzles facing the central axis of the annular tube.

[0018] By employing the above technical solution, a high-pressure fluid is supplied to the annular pipe via a fluid source, and then ejected as a converging high-speed jet through a nozzle. When the high-temperature slag flow passes through the central region of the annular pipe, it is forcefully sheared, impacted, and broken into fine droplets by the high-speed jet. This non-contact fluid granulation method avoids direct contact between mechanical parts and high-temperature molten slag, reducing equipment wear and thermal deformation, and extending the equipment's service life.

[0019] Optionally, it also includes a sealing cover, which is located above the support platform and disposed on the support platform. The annular flow channel is located inside the sealing cover, and the sealing cover is rotatably connected to the support platform. The sealing cover is connected to the fixed bracket, and the slag discharge device, the granulation device, and the medium heat exchange device are all connected to the sealing cover.

[0020] By adopting the above technical solution, the sealing cover is fixed as a stationary component on the fixed support and covers the rotating support platform, thereby forming a relatively closed stationary chamber above the annular flow channel. Thus, the sealing cover not only prevents dust and harmful gases generated during high-temperature production from overflowing and polluting the environment, but also isolates external air from entering the annular flow channel, preventing oxidation of the liquid heat exchange medium and high-temperature slag particles, ensuring the quality of the recovered product and the performance of the medium.

[0021] Optionally, a first water seal annular groove is coaxially formed on the support platform. The first water seal annular groove is coaxially arranged with the annular flow channel, and the annular flow channel is located inside the first water seal annular groove. The sealing cover is inserted into the first water seal annular groove, and the sealing cover is spaced apart from the inner sidewall of the first water seal annular groove. The first water seal annular groove is filled with sealing liquid, and the lower end of the sealing cover is located inside the sealing liquid.

[0022] By adopting the above technical solution, when the support platform rotates, the edge of the sealing cover is always immersed in the sealing liquid in the first water seal ring groove. This non-contact liquid seal structure not only ensures the smooth rotation of the support platform, but also achieves airtight sealing between the sealing cover and the support platform, effectively blocking the exchange of internal and external gases.

[0023] Optionally, it also includes an intake pipe and an inert gas source. The intake pipe is connected to the sealing cover, with one end extending into the sealing cover and the other end connected to the inert gas source. It also includes an oxygen sensor and a controller. The oxygen sensor is disposed inside the sealing cover and is used to detect the oxygen concentration inside the sealing cover. The controller is electrically connected to the oxygen sensor and the inert gas source, respectively, and is used to control the gas output of the inert gas source according to the oxygen concentration detected by the oxygen sensor.

[0024] By employing the above technical solution, inert gas is continuously injected into the sealed chamber formed by the sealing cover and the support platform through the air inlet pipe, displacing and expelling the air in the sealed chamber and maintaining a slightly positive pressure environment within it. Simultaneously, an oxygen sensor monitors the oxygen concentration within the sealing cover in real time and transmits the detection signal to the controller. The controller automatically adjusts the output of the inert gas source based on the oxygen concentration signal, thereby controlling the oxygen content within the sealing cover. When the oxygen concentration exceeds a preset threshold, the controller increases the output of the inert gas to rapidly dilute the oxygen; when the oxygen concentration drops to a safe range, the controller reduces the output of the inert gas to conserve gas consumption. This further ensures that the high-temperature liquid heat exchange medium does not come into contact with oxygen, thereby reducing the possibility of oxidation and scum formation in the heat exchange medium and maintaining its purity and fluidity.

[0025] Optionally, it also includes an anode sacrificial rod, which is vertically arranged and located inside the sealing cover. The upper end of the anode sacrificial rod is connected to the sealing cover, and the lower end of the anode sacrificial rod extends into the annular flow channel and contacts the heat exchange medium.

[0026] By adopting the above technical solution, utilizing the principles of electrochemical corrosion or high-temperature chemical reaction, the anode sacrificial rod is immersed in the high-temperature heat exchange medium as a sacrificial anode. Under high-temperature conditions, if trace amounts of oxygen infiltrate or corrosive factors are present, the anode sacrificial rod will be preferentially oxidized or corroded, thus protecting the liquid metal, which is the main heat exchange medium, from oxidation. It also protects other metal components in contact with the heat exchange medium from corrosion, thereby extending the maintenance cycle and service life of the device.

[0027] Optionally, it also includes a medium heating device, which is located within the annular flow channel and connected to the fixed bracket.

[0028] By adopting the above technical solution, the medium heating device is immersed in the heat exchange medium in the annular flow channel. During the initial startup of the device, during shutdown heat preservation, or during low-load operation, the medium heating device is turned on to provide auxiliary heating for the heat exchange medium, preventing the heat exchange medium from solidifying due to the temperature dropping below the melting point. This avoids equipment damage and startup difficulties caused by medium solidification, and ensures the all-weather availability of the device.

[0029] In summary, this application includes at least one of the following beneficial technical effects: 1. This application utilizes the design of a support platform to achieve directional circulation and transport of the heat exchange medium through its own rotation. This ensures that the heat exchange medium remains solely within the annular flow channel, which is less prone to blockage. This reduces the likelihood of malfunctions in the heat recovery device and improves its long-term operational stability. Simultaneously, because the heat exchange medium remains within the annular flow channel, heat exchange between the medium and the external environment is reduced, minimizing unnecessary heat loss and thus enhancing the overall heat recovery efficiency of the device.

[0030] 2. This application, through the configuration of a rectifier and a granulator, pre-breaks a continuous, thick, high-temperature slag stream into dispersed, fine slag droplets. These droplets then contact the heat exchange medium, increasing the heat exchange area and allowing the slag droplets to undergo intense heat exchange and rapid solidification the instant they fall into the liquid heat exchange medium. This rapid cooling effectively inhibits the precipitation and growth of crystals within the slag stream, resulting in high-glass transition and highly active solid slag particles.

[0031] 3. This application achieves sealed protection and oxygen isolation of the heat exchange medium through the coordinated design of the sealing cover, the first water seal ring groove, the air inlet pipe, the inert gas source, the oxygen sensor, the controller, and the anode sacrificial rod. This ensures that the expensive heat exchange medium does not oxidize or sludge during long-term use, significantly reducing operating costs and the possibility of heat recovery device failure. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of the heat recovery device according to Embodiment 1 of this application.

[0033] Figure 2 This is a cross-sectional structural schematic diagram of the support platform of Embodiment 1 of this application.

[0034] Figure 3 This is a schematic diagram of the overall structure of the slag output device of Embodiment 1 of this application.

[0035] Figure 4 This is a cross-sectional structural schematic diagram of the granulation device of Embodiment 1 of this application.

[0036] Figure 5 This is a top view of the sealing cover of Embodiment 1 of this application.

[0037] Figure 6 This is a schematic diagram of the internal structure of the sealing cover of Embodiment 1 of this application.

[0038] Figure 7 This is a cross-sectional structural schematic diagram of the waste heat recovery device of Embodiment 1 of this application.

[0039] Figure 8 This is a schematic diagram of the overall structure of the media protection device in Embodiment 2 of this application.

[0040] Figure 9 This is a cross-sectional structural schematic diagram of the granulation device of Embodiment 3 of this application.

[0041] Figure 10 This is a cross-sectional structural schematic diagram of the granulation device of Embodiment 4 of this application.

[0042] In the diagram, 1. Slag output device; 2. Granulation device; 21. Rectifier; 211. Feed pipe; 212. Intermediate tank; 213. Discharge pipe; 214. Mounting base; 22. Granulator; 221. Rotary drive; 222. Drive shaft; 223. Granulation turntable; 224. Fluid source; 2241. Gas source; 2242. Temporary storage tower; 2243. Return liquid pipe; 2244. Supply liquid pipe; 2245. Return liquid pump; 2246. Pump frame; 225. Annular pipe; 226. Nozzle; 3. Circulating heat exchange device; 31. Support platform; 32. Annular flow channel; 33. Rotary drive mechanism; 34. First water seal annular groove; 5. Second water seal ring groove; 4. Slag discharge device; 41. Extension bracket; 42. Slag skimmer; 43. Anti-overflow baffle; 44. Outlet baffle; 45. Inlet baffle; 46. Slag discharger; 5. Medium heat exchange device; 51. Heat exchange tube bundle; 52. Fixed connecting pipe; 6. Sealing cover; 61. Secondary sealing ring; 62. Slag discharge port; 7. Medium protection device; 71. Air inlet pipe; 72. Inert gas source; 73. Anode sacrificial rod; 74. Mounting rod; 8. Waste heat recovery device; 81. Insulated silo; 82. Unloader; 83. Particle heat exchanger; 9. Medium heating device; 91. Heater; 92. Conductive mounting column; 10. Fixed bracket. Detailed Implementation

[0043] The following is in conjunction with the appendix Figure 1 -Appendix Figure 10 This application will be described in further detail below.

[0044] Example 1: An integrated heat recovery device for blast furnace slag, referring to... Figure 1 and Figure 2 It includes a slag output device 1, a granulation device 2, a circulating heat exchange device 3, and a fixed support 10.

[0045] Reference Figure 1 and Figure 2The circulating heat exchange device 3 includes a support platform 31, which is horizontally positioned. An annular flow channel 32 is coaxially formed on the upper side of the support platform 31. A rotary drive mechanism 33 is located at the bottom of the support platform 31. A medium heat exchange device 5 is installed within the annular flow channel 32. A slag output device 1 is located above the granulation device 2 and is connected to the inlet of the granulation device 2. The granulation device 2 is located above the support platform 31, and its outlet is directly opposite the annular flow channel 32. Fixed supports 10 are spaced apart on the outside of the support platform 31, and the medium heat exchange device 5 is connected to the fixed supports 10.

[0046] Since the annular flow channel 32 is pre-filled with heat exchange medium, the rotary drive mechanism 33 drives the support platform 31 to rotate. Utilizing the viscous friction between the inner wall of the annular flow channel 32 and the heat exchange medium, the support platform 31 transfers kinetic energy to the heat exchange medium, causing it to rotate continuously in a predetermined direction. Thus, when the high-temperature slag flow is discharged from the blast furnace, it is transported from the molten slag output device 1 to the granulation device 2. After being broken into fine slag droplets by the granulation device 2, the slag droplets fall into the annular flow channel 32 of the support platform 31. At this time, the heat exchange medium carries the slag droplets for directional transport. During this process, the slag droplets fully contact and exchange heat with the heat exchange medium, rapidly cooling and solidifying into solid slag particles, while the corresponding heat exchange medium absorbs heat and heats up. During this process, an external medium is continuously introduced into the medium heat exchange device 5, allowing the external medium to continuously absorb heat from the heat exchange medium, thus achieving heat recovery.

[0047] Reference Figure 1 and Figure 3 The slag output device 1 adopts a slag ditch or slag flow channel. One end of the slag output device 1 is the feed end and the other end is the discharge end along its own length. The feed end of the slag output device 1 is connected to the blast furnace taphole, and the discharge end is connected to the granulation device 2.

[0048] The slag output device 1, as a component connecting the blast furnace and the granulation device 2, guides the high-temperature slag flow smoothly and continuously into the granulation device 2. The slag output device 1 adopts a slag ditch or slag flow channel, which enables the slag output device 1 to withstand the scouring and corrosion of the high-temperature slag flow and has a certain heat preservation performance, reducing the heat loss of the high-temperature slag flow during the transportation process.

[0049] Reference Figure 1 and Figure 2 The granulation device 2 includes a rectifier 21 and a granulator 22. The rectifier 21 is vertically arranged above the annular flow channel 32, and the upper end of the rectifier 21 is connected to the discharge end of the molten slag output device 1. The lower end of the rectifier 21 is arranged directly opposite the annular flow channel 32, and the granulator 22 is arranged at the lower end of the rectifier 21.

[0050] After the molten slag output device 1 guides the high-temperature slag flow into the rectifier 21, the rectifier 21 shapes the high-temperature slag flow, making it a liquid flow with a regular shape and stable velocity, providing an ideal material for the granulator 22 to crush. The granulator 22 is located at the lower end of the rectifier 21. When the high-temperature slag flow flows out from the lower end of the rectifier 21, the granulator 22 can break the high-temperature slag flow into tiny droplets, i.e., slag droplets, so that the high-temperature slag flow falls into the annular flow channel 32 in the state of slag droplets. This can increase the specific surface area of ​​the high-temperature slag flow, thereby increasing the contact area between the high-temperature slag flow and the heat exchange medium in the subsequent annular flow channel 32, thereby improving the heat exchange efficiency and cooling rate.

[0051] Reference Figure 2 and Figure 4 The rectifier 21 includes a feed pipe 211, an intermediate tank 212, and a discharge pipe 213. The intermediate tank 212 is axially arranged in a vertical direction and has an opening at its upper end. The feed pipe 211 is located between the intermediate tank 212 and the molten slag output device 1. The upper end of the feed pipe 211 is connected to the discharge end of the molten slag output device 1, and the lower end extends obliquely to connect with the middle of the intermediate tank 212. The discharge pipe 213 is located between the intermediate tank 212 and the annular flow channel 32. The upper end of the discharge pipe 213 is connected to the bottom of the intermediate tank 212, and the lower end is positioned towards the annular flow channel 32.

[0052] Based on the coordinated design of the feed pipe 211, intermediate tank 212, and discharge pipe 213, the high-temperature slag flows tangentially or smoothly into the intermediate tank 212 through the feed pipe 211. The intermediate tank 212 serves to store slag and buffer pressure, utilizing the accumulated liquid level within it to create a stable static pressure head. Thus, regardless of fluctuations in the upstream feed flow rate, the slag flow exiting from the discharge pipe 213 at the bottom of the intermediate tank 212 maintains a constant flow velocity and regular shape, providing optimal feeding conditions for the granulator 22 below and preventing uneven granulation due to fluctuating flow rates.

[0053] In this embodiment, refer to Figure 4 The discharge pipe 213 is detachably connected to the bottom of the intermediate tank 212. Specifically, a mounting base 214 is provided at the upper end of the discharge pipe 213, which is fixedly connected to the discharge pipe 213. A central hole is provided through the mounting base 214, which communicates with the discharge pipe 213. A discharge port is provided through the bottom of the intermediate tank 212. The mounting base 214 is connected to the bottom of the intermediate tank 212 by bolts, and the mounting base 214 closes the discharge port, while the central hole communicates with the discharge port.

[0054] Since the discharge pipe 213 is detachably connected to the bottom of the intermediate tank 212, it is convenient to replace the excessively worn discharge pipe 213 or to replace the discharge pipe 213 with one of different diameters. Replacing the discharge pipe 213 can reduce maintenance costs or adapt to different production conditions.

[0055] Reference Figure 2 and Figure 4 The granulator 22 includes a rotary driver 221, a drive shaft 222, and a granulation disc 223. The granulation disc 223 is located inside or directly above the annular flow channel 32, and its axial direction is vertical. The granulation disc 223 is located below the discharge pipe 213, and the lower end of the discharge pipe 213 is directly opposite the granulation disc 223. The drive shaft 222 is located directly above the granulation disc 223, and its lower end is coaxially and fixedly connected to the granulation disc 223. The upper end of the drive shaft 222 is connected to the rotary driver 221.

[0056] With the structural design of the granulator 22, after the high-temperature slag flows out from the lower end of the discharge pipe 213, it falls onto the high-speed rotating granulation disc 223. At this time, under the action of centrifugal force, the high-temperature slag spreads on the surface of the granulation disc 223 and accelerates towards the edge. When the high-temperature slag leaves the edge of the granulation disc 223, it is torn apart and atomized into fine droplets by the huge centrifugal force, and then radially scattered into the heat exchange medium in the annular flow channel 32. This mechanical granulation method has high crushing energy, precise particle size control, and can increase the contact area between the high-temperature slag and the heat exchange medium.

[0057] In this embodiment, refer to Figure 4 and Figure 5 The rotary drive 221 includes a drive motor and a belt drive assembly. The output shaft of the drive motor is vertically downward. The belt drive assembly includes a drive pulley, a driven pulley, and a drive belt. The drive pulley is coaxially mounted on the output shaft of the drive motor, the driven pulley is coaxially mounted on the upper end of the drive shaft 222, and the drive belt is mounted on the outside of the drive pulley and the driven pulley.

[0058] The rotary actuator 221, through its design of a drive motor and belt drive, spatially isolates the drive motor from high-temperature areas, thus preventing overheating and damage to the drive motor. This extends the service life of the drive motor and also facilitates its inspection and maintenance.

[0059] Reference Figure 1 and Figure 2 A sealing cover 6 is provided above the support platform 31. The sealing cover 6 covers the support platform 31, and the annular flow channel 32 is located inside the sealing cover 6, which closes the annular flow channel 32.

[0060] With the sealing cover 6 in place, a closed chamber is formed between the sealing cover 6 and the support platform 31, thereby protecting the heat exchange medium in the annular flow channel 32.

[0061] In this embodiment, refer to Figure 1 and Figure 2The sealing cover 6 is rotatably connected to the support platform 31, and the sealing cover 6 is also connected to the fixed bracket 10. This allows the sealing cover 6 to function as a stationary component, not rotating with the support platform 31, thereby forming a closed stationary chamber above the annular flow channel 32. This design ensures that the support platform 31 can rotate normally while effectively isolating the external environment.

[0062] Based on this, refer to Figure 2 and Figure 4 The intermediate tank 212 is located above the sealing cover 6 and is fixedly connected to the fixed bracket 10 or the sealing cover 6. The lower end of the discharge pipe 213 extends into the sealing cover 6 and is sealed to the sealing cover 6. The granulation turntable 223 is located inside the sealing cover 6, and the rotary driver 221 is located outside the sealing cover 6. The upper end of the drive shaft 222 extends outside the sealing cover 6 and is connected to the rotary driver 221 for transmission. The lower end of the drive shaft 222 extends into the sealing cover 6 and is coaxially connected to the granulation turntable 223. The rotary driver 221 is fixedly connected to the fixed bracket 10 or the sealing cover 6, and the drive shaft 222 is rotatably connected to the sealing cover 6.

[0063] In this embodiment, refer to Figure 2 A first water seal annular groove 34 is coaxially formed on the upper side of the support platform 31. The first water seal annular groove 34 is coaxially arranged with the annular flow channel 32, and the annular flow channel 32 is located inside the first water seal annular groove 34. The sealing cover 6 is inserted into the first water seal annular groove 34, and the sealing cover 6 is spaced apart from the inner wall of the first water seal annular groove 34. The first water seal annular groove 34 is filled with sealing fluid, and the lower end of the sealing cover 6 is located in the sealing fluid. In this embodiment, the sealing fluid is water or high-boiling-point silicone oil.

[0064] Through the design of the first water seal groove, when the support platform 31 rotates, the lower edge of the sealing cover 6 is always immersed in the sealing liquid. By utilizing the fluidity and barrier properties of the sealing liquid, a non-contact airtight seal is achieved between the support platform 31 and the sealing cover 6, effectively preventing outside air from entering the annular flow channel 32.

[0065] In this embodiment, refer to Figure 2 The sealing cover 6 also includes a secondary sealing ring 61, which is coaxially arranged with the support platform 31, and its upper end is fixedly connected to the sealing cover 6. A second water seal ring groove 35 is coaxially formed on the support platform 31, and is coaxially arranged with the annular flow channel 32, which is located outside the second water seal ring groove 35. The lower end of the secondary sealing ring 61 is inserted into the second water seal ring groove 35, and the secondary sealing ring 61 is spaced apart from the inner wall of the second water seal ring groove 35. The second water seal ring groove 35 is also filled with sealing fluid, and the lower end of the secondary sealing ring 61 is also located within the corresponding sealing fluid.

[0066] This design creates a double water seal protection for both the inner and outer sides of the annular flow channel 32. This ensures that external air cannot enter the sealing cover 6 through the rotation gap from any direction, thereby further improving the reliability of the seal.

[0067] Reference Figure 1 and Figure 2 A medium protection device 7 is provided on the sealing cover 6. The medium protection device 7 includes an inlet pipe 71 and an inert gas source 72. The inlet pipe 71 is vertically arranged and connected to the sealing cover 6. The upper end of the inlet pipe 71 extends outside the sealing cover 6, and the lower end extends into the annular flow channel 32. Furthermore, the upper end of the inlet pipe 71 is connected to the inert gas source 72 via a pipe. In this embodiment, the inert gas source 72 is a high-pressure nitrogen station or an argon cylinder group. The medium protection device 7 also includes an oxygen sensor and a controller. The oxygen sensor is located inside the sealing cover 6. The controller is electrically connected to both the oxygen sensor and the inert gas source 72. In this embodiment, the oxygen sensor is an electrochemical oxygen sensor or a zirconia oxygen sensor, and the controller is a PLC controller or an industrial computer.

[0068] Inert gas is continuously introduced into the sealed cover 6 through the inlet pipe 71 to replace and expel residual air, maintaining a slightly positive pressure environment within the sealed cover 6. Simultaneously, an oxygen sensor monitors the oxygen concentration within the sealed cover 6 in real time and feeds the detection signal back to the controller. The controller automatically adjusts the gas output of the inert gas source 72 based on the detected oxygen concentration. When the oxygen concentration exceeds a preset threshold, the controller increases the inert gas output to quickly dilute the oxygen; when the oxygen concentration drops to a safe range, the controller appropriately reduces the inert gas output to conserve gas consumption. This isolates oxygen from the high-temperature heat exchange medium, preventing oxidation and scum formation, while also protecting the high-temperature slag stream from oxidation, thus ensuring the quality of the recovered product.

[0069] Reference Figure 2 and Figure 6 A slag discharge device 4 is provided above the support platform 31. The slag discharge device 4 is located inside and connected to the sealing cover 6, and the lower end of the slag discharge device 4 extends into the annular flow channel 32. Reference Figure 6 The slag discharge device 4 includes an extension bracket 41 and a skimmer 42. Both the extension bracket 41 and the skimmer 42 are located inside the sealing cover 6. The upper end of the extension bracket 41 is connected to the inner top wall of the sealing cover 6, and the lower end of the extension bracket 41 is connected to the skimmer 42. The skimmer 42 is located inside the annular flow channel 32. The upper side of the skimmer 42 is higher than the upper side of the support platform 31 in the vertical direction. The length direction of the skimmer 42 is arranged radially along the support platform 31. Both sides of the skimmer 42 in the length direction are slidably engaged with the inner sidewall of the annular flow channel 32.

[0070] With the extension bracket 41 designed, the skimmer 42 is suspended as a stationary component within the annular flow channel 32. The lower end of the skimmer 42 is spaced apart from the inner wall of the bottom of the annular flow channel 32, while the upper end extends to the upper side of the support platform 31, ensuring that the skimmer 42 does not rotate with the support platform 31. Therefore, when the support platform 31 drives the heat exchange medium and floating solid slag particles to rotate past the position of the skimmer 42, the skimmer 42 laterally intercepts the liquid surface of the heat exchange medium, preventing the solid slag particles from continuing to move, thus forcing the solid slag particles to accumulate in front of the skimmer 42.

[0071] Reference Figure 6 An anti-overflow block 43 is provided on one side of the skimmer 42 along its own length toward the center of the support platform 31. The anti-overflow block 43 is located above the support platform 31, and its lower side is slidably connected to the support platform 31. The anti-overflow block 43 is arranged circumferentially along the support platform 31 along its own length, and its middle part is connected to the skimmer 42.

[0072] The anti-overflow baffle 43 is designed to prevent intercepted solid slag particles from bypassing or overflowing from the inside of the skimmer 42.

[0073] Reference Figure 6 The skimmer 42 has a discharge block 44 and an inlet block 45 on the side opposite to the overflow baffle 43 along its length. The discharge block 44 and the inlet block 45 are spaced apart around the support platform 31, thus forming a material guiding channel between the inlet block 45 and the discharge block 44. Furthermore, the discharge block 44 is fixedly connected to the skimmer 42, and the inlet block 45 is fixedly connected to the inner wall of the sealing cover 6. Both the discharge block 44 and the inlet block 45 are located above the support platform 31 and are slidably connected to the support platform 31.

[0074] A slag discharge port 62 is provided through the outer wall of the sealing cover 6, and one end of the material guiding channel is connected to the slag discharge port 62.

[0075] The skimmer 42 has an inclined guide surface on one side of the support platform 31 facing the guide block 45.

[0076] Thus, under the continuous flow of fluid dynamic pressure and the pushing action of subsequent solid slag particles, the intercepted solid slag particles accumulate and rise outward along the guide surface of the skimmer 42. At this time, the solid slag particles intercepted by the skimmer 42 move outward along the surface of the skimmer 42 and eventually enter the material guiding channel formed by the inlet baffle 45 and the outlet baffle 44, and finally converge to the slag discharge port 62 and be discharged from the slag discharge port 62.

[0077] In this embodiment, refer to Figure 6The guide block 45 extends at an angle away from the center of the support platform 31. This design makes the end of the material guide channel away from the slag discharge port flared out, which can more effectively collect the solid slag particles intercepted by the skimmer 42 and smoothly guide the solid slag particles into the material guide channel, preventing solid slag particles from accumulating and clogging at the entrance of the material guide channel.

[0078] Reference Figure 6 The slag discharge device 4 also includes a slag discharger 46, which adopts a slag discharge pipe. The slag discharge pipe is located outside the sealing cover 6 and is spaced apart from the support platform 31. The upper end of the slag discharge pipe is connected to the sealing cover 6 and communicates with the slag discharge port 62. The lower end of the slag discharge pipe extends downward at an inclination away from the support platform 31.

[0079] With the design of the slag discharger 46, solid slag particles pass through the slag discharge port 62 into the slag discharge pipe, and slide down the inclined slag discharge pipe under their own gravity and are discharged.

[0080] In this embodiment, the slag discharger 46 can also be a screw conveyor or a vibrating conveyor.

[0081] Reference Figure 6 and Figure 7 Outside the sealing cover 6, a waste heat recovery device 8 is also provided. The waste heat recovery device 8 includes an insulated silo 81, which is connected to the fixed support 10. The insulated silo 81 is vertically arranged, with a feed inlet at the top that is connected to the slag discharger 46. A discharge outlet is located at the bottom of the insulated silo 81, and a discharger 82 is installed thereat, connected to the discharge outlet. A particle heat exchanger 83 is also installed inside the insulated silo 81.

[0082] In this embodiment, the unloader 82 is a star-shaped unloader or a rotary airlock valve. The particle heat exchanger 83 is a serpentine coil heat exchanger or a vertical tube heat exchanger.

[0083] Based on the waste heat recovery device 8, the solid slag particles discharged from the slag discharger 46 fall into the insulated silo 81 and accumulate, thus bringing the solid slag particles into contact with the particle heat exchanger 83. At this time, an external medium is introduced into the particle heat exchanger 83, allowing heat exchange between the external medium and the solid slag particles. The external medium absorbs the sensible heat released by the solid slag particles, raising its temperature and thus completing the heat recovery of the solid slag particles; while the solid slag particles gradually cool as heat is carried away. Subsequently, the cooled solid slag particles are quantitatively discharged from the outlet at the lower end of the insulated silo 81 under the control of the unloader 82. By adjusting the rotation speed of the unloader 82, the downward speed and residence time of the solid slag particles in the insulated silo 81 can be controlled, ensuring that the heat of the solid slag particles is fully recovered. Simultaneously, the unloader 82 also acts as an airlock, preventing outside air from entering the insulated silo 81 and affecting the heat exchange efficiency.

[0084] Reference Figure 1 and Figure 2 The medium heat exchange device 5 includes a heat exchange tube bundle 51, which is an immersion tube bundle heat exchanger or a serpentine coil evaporator. The heat exchange tube bundle 51 is located in the annular flow channel 32 and is spaced apart from the support platform 31.

[0085] Reference Figure 2 and Figure 5 The heat exchange tube bundle 51 has fixed connecting pipes 52 at both ends along its length. The fixed connecting pipes 52 are vertically arranged, and the lower end of the fixed connecting pipe 52 is connected to the corresponding end of the heat exchange tube bundle 51. The upper end of the fixed connecting pipe 52 extends to the outside of the sealing cover 6, and the fixed connecting pipe 52 is connected to the sealing cover 6.

[0086] Since the heat exchange tube bundle 51 is fixed to the stationary sealing cover 6 via the fixed connecting pipe 52, and the heat exchange medium in the annular flow channel 32 rotates with the support platform 31, relative motion occurs between the heat exchange medium and the heat exchange tube bundle 51. This relative motion disrupts the boundary layer on the surface of the tube wall of the heat exchange tube bundle 51, thereby enhancing the convective heat transfer effect and enabling the external medium to efficiently absorb heat from the heat exchange medium.

[0087] Reference Figure 1 and Figure 2 The annular flow channel 32 is also equipped with a medium heating device 9, which includes a heater 91. The heater 91 is an electric heating rod or a ceramic radiation heater. The heater 91 is located vertically below the heat exchange tube bundle 51 and is also located in the annular flow channel 32 and spaced apart from the support platform 31.

[0088] Reference Figure 2 and Figure 5 The heater 91 is provided with two conductive mounting posts 92. The conductive mounting posts 92 are vertically arranged, and the lower end of the conductive mounting posts 92 is fixedly connected to the heater 91, while the upper end extends to the outside of the sealing cover 6 and is connected to the sealing cover 6.

[0089] The conductive mounting post 92 is designed to fix the heater 91 inside the sealing cover 6, facilitating connection to an external power source via the conductive mounting post 92 and ensuring a stable power supply for the heater 91. This allows the heater 91 to heat the heat exchange medium even when the medium temperature is low, preventing damage to the equipment caused by the heat exchange medium solidifying due to temperature drop.

[0090] Reference Figure 1 and Figure 2The rotary drive mechanism 33 includes a base with an annular track on it, and the bottom of the support platform 31 is slidably mounted on the annular track. The rotary drive mechanism 33 also includes a drive motor, a reducer, a drive gear, and a large gear ring coaxially fixed to the bottom of the support platform 31. The drive motor is connected to the reducer, the reducer is connected to the drive gear, and the drive gear meshes with the large gear ring.

[0091] Therefore, when the drive motor is working, the speed of the support platform 31 can be adjusted by controlling the speed of the drive motor, thereby controlling the circulation speed of the heat exchange medium to adapt to the processing requirements of different blast furnace slag discharge amounts.

[0092] Reference Figure 1 Since the drive motor, reducer and drive gear are all independently set outside the support platform 31, the drive motor, reducer and drive gear are all mounted on the fixed bracket 10.

[0093] The implementation principle of this application embodiment is as follows: when processing high-temperature slag flow, the high-temperature slag flow is introduced into the granulation device 2 through the molten slag output device 1. The granulation device 2 breaks the high-temperature slag flow into fine slag droplets, and then the broken slag droplets fall into the annular flow channel 32.

[0094] As the rotary drive mechanism 33 drives the support platform 31 to rotate, it drives the heat exchange medium in the annular flow channel 32 to directionally circulate and transport. Therefore, at this time, the heat exchange medium carries the slag droplets in the annular flow channel 32 for directional transport. During this process, the slag droplets exchange heat with the heat exchange medium, causing the slag droplets to rapidly cool and solidify and release heat. The solidified solid slag particles automatically float to the surface of the heat exchange medium due to the density difference.

[0095] When the heat exchange medium carrying solid slag particles flows through the slag discharge device 4, the slag discharge device 4 automatically separates the solid slag particles from the heat exchange medium. The separated solid slag particles are discharged into the waste heat recovery device 8. At this time, the external medium in the waste heat recovery device 8 absorbs the heat from the solid slag particles, thereby realizing primary heat recovery. The heat exchange medium after the solid slag particles are removed continues to be transported in a directional circulation.

[0096] Throughout the process, the external medium flowing inside the medium heat exchange device 5 continuously absorbs heat from the heat exchange medium, thus achieving heat recovery.

[0097] Example 2: An integrated heat recovery device for blast furnace slag, referring to... Figure 8 The difference between this embodiment and Embodiment 1 is that, in this embodiment, the heat exchange medium is preferably liquid lead or a lead-bismuth alloy. The medium protection device 7 also includes an anode sacrificial rod 73, which is vertically arranged and has an mounting rod 74 coaxially arranged at its upper end, and the mounting rod 74 is fixedly connected to the anode sacrificial rod 73.

[0098] A clearance hole is provided through the sealing cover 6. The anode sacrificial rod 73 is inserted into the clearance hole and its lower end extends into the annular flow channel 32 and contacts the heat exchange medium. The mounting rod 74 is located outside the sealing cover 6 and is connected to the sealing cover 6 by bolts. The mounting rod 74 also closes the clearance hole.

[0099] In this embodiment, the anode sacrificial rod 73 is a graphite rod or a magnesium-aluminum alloy rod.

[0100] The implementation principle of this embodiment is as follows: Since the heat exchange medium within the annular flow channel 32 is in a high-temperature molten state, although the sealing cover 6 and inert gas protect the heat exchange medium, trace amounts of oxygen will inevitably seep in during long-term operation. Because the anode sacrificial rod 73 material has a much greater affinity for oxygen than the heat exchange medium, under high-temperature conditions, the infiltrated oxygen will preferentially react chemically with the anode sacrificial rod 73, thereby absorbing oxygen and keeping the heat exchange medium in a reduced state, preventing it from reacting with oxygen. This effectively prevents the heat exchange medium from oxidizing and generating lead oxide slag, thus ensuring the purity of the heat exchange medium and the long-term stable operation of the entire device.

[0101] Example 3: An integrated heat recovery device for blast furnace slag, referring to... Figure 2 and Figure 9 The difference between this embodiment and embodiment 1 is that the granulator 22 includes a fluid source 224, an annular tube 225 and several nozzles 226. The fluid source 224 is located outside the sealing cover 6, and the annular tube 225 is located inside the sealing cover 6. The fluid source 224 includes a gas source 2241. The gas source 2241 and the annular tube 225 are connected by a pipe. The pipe passes through the sealing cover 6 and is sealed to the sealing cover 6. Several nozzles 226 are all arranged on the annular tube 225, and several nozzles 226 are arranged sequentially along the circumference of the annular tube 225.

[0102] The annular pipe 225 is fixed to the outer side of the lower end of the discharge pipe 213, and the annular pipe 225 is coaxially arranged with the lower end of the discharge pipe 213. Several nozzles 226 are located on the lower side of the annular pipe 225, and the spray direction of the several nozzles 226 is all set towards the central axis of the annular pipe 225. This allows the airflow ejected from the several nozzles 226 to converge into the high-temperature slag flow output below the discharge pipe 213.

[0103] When the granulation device 2 is running, when the high-temperature slag flow flows out from the discharge pipe 213 of the rectifier 21, several nozzles 226 simultaneously eject supersonic high-pressure airflow. These high-pressure airflows form a high-intensity shear field around the slag flow, instantly tearing the continuous high-temperature slag flow and atomizing it into fine droplets, i.e. slag droplets.

[0104] In this embodiment, the gas source 2241 is a high-pressure nitrogen station or a superheated steam generator, using inert gas or steam as the injection medium to prevent oxidation of the high-temperature slag flow during granulation. The nozzle 226 is a Laval nozzle made of high-temperature resistant alloy to ensure that the ejected airflow can be accelerated to supersonic speeds, providing sufficient crushing kinetic energy.

[0105] The implementation principle of this application embodiment is as follows: the granulator 22 utilizes the high-speed fluid kinetic energy generated by high-pressure gas to produce a violent gas-liquid shearing action on the surface of the high-temperature slag flow, thereby overcoming the surface tension and viscous force of the high-temperature slag flow and realizing the crushing and granulation of the high-temperature slag flow.

[0106] Example 4: An integrated heat recovery device for blast furnace slag, referring to... Figure 10 The difference between this embodiment and Embodiment 3 is that the fluid source 224 includes a temporary storage tower 2242, which is vertically arranged. A return liquid pipe 2243 is provided between the temporary storage tower 2242 and the annular flow channel 32, and a return liquid pump 2245 is provided inside the annular flow channel 32. The return liquid pump 2245 is located below the liquid surface of the heat exchange medium inside the annular flow channel 32, and one end of the return liquid pipe 2243 is connected to the return liquid pump 2245, while the other end is connected to the temporary storage tower 2242. A supply liquid pipe 2244 is provided between the temporary storage tower 2242 and the annular pipe 225, with one end connected to the temporary storage tower 2242 and the other end connected to the annular pipe 225. The connection point between the supply liquid pipe 2244 and the temporary storage tower 2242 is located below the connection point between the return liquid pipe 2243 and the temporary storage tower 2242.

[0107] In this embodiment, a pressure-stabilizing gas source is also connected to the top of the temporary storage tower 2242. This pressure-stabilizing gas source is connected to the internal space of the temporary storage tower 2242, allowing it to introduce gas into the tower to regulate and maintain stable pressure. This compensates for pressure fluctuations caused by changes in the heat exchange medium's liquid level, ensuring constant flow and pressure at the outlet of the liquid supply pipe 2244. In this embodiment, an inert gas source is used to prevent oxidation reactions between the introduced gas and the high-temperature heat exchange medium.

[0108] In this embodiment, refer to Figure 10 A pump frame 2246 is fixed to the inner wall of the sealing cover 6, and a return pump 2245 is connected to the pump frame 2246. The supply pipe 2244 and the return pipe 2243 both extend along their own length and penetrate the sealing cover 6, and both the supply pipe 2244 and the return pipe 2243 are connected to the sealing cover 6.

[0109] In this embodiment, refer to Figure 10The connection point between the liquid supply pipe 2244 and the temporary storage tower 2242 is near the bottom of the temporary storage tower 2242, while the connection point between the liquid return pipe 2243 and the temporary storage tower 2242 is near the top of the temporary storage tower 2242. This allows a portion of the heat exchange medium to be stored within the temporary storage tower 2242. The liquid level within the temporary storage tower 2242 creates a stable static pressure head, which, combined with the continuous pumping pressure of the return pump 2245 and the constant gas pressure provided by the pressure stabilizing gas source, ensures that the heat exchange medium entering the annular pipe 225 through the liquid supply pipe 2244 maintains a constant flow rate and pressure. The pressure stabilizing gas source acts on the gas phase space at the top of the temporary storage tower 2242. When the liquid level drops, causing the gas phase space to increase, the pressure stabilizing gas source replenishes gas to maintain a constant pressure; when the liquid level rises, causing the gas phase space to decrease, excess gas can be discharged through the pressure relief valve on the pressure stabilizing gas source, thus always maintaining a constant pressure within the temporary storage tower 2242. When the high-pressure heat exchange medium is ejected at high speed from several nozzles 226, the converging liquid fluid directly impacts the high-temperature slag flow falling from the center. This utilizes the kinetic energy of the liquid flow to forcibly shear and break up the high-temperature slag flow. The implementation principle of this embodiment is as follows: The granulator 22 uses a return pump 2245 to extract the liquid medium and injects it into the temporary storage tower 2242 through the return pipe 2243. At this time, the heat exchange medium accumulates in the temporary storage tower 2242 and forms a stable liquid column height, which serves both as a buffer and to ensure a constant output pressure of the subsequent heat exchange medium. Simultaneously, a pressure-stabilizing gas source continuously supplies inert gas to the gas phase space at the top of the temporary storage tower 2242 to compensate for pressure fluctuations caused by changes in the liquid level of the heat exchange medium, thereby maintaining a stable gas pressure within the temporary storage tower 2242. This further ensures a constant flow rate and pressure at the outlet of the liquid supply pipe 2244, guaranteeing the uniformity and consistency of the granulation effect. Subsequently, under the combined action of gravity, pumping pressure, and stabilizing gas source pressure, the heat exchange medium rapidly flows out from the liquid supply pipe 2244 at the bottom of the temporary storage tower 2242 and is forced into the annular pipe 225. Finally, the heat exchange medium is ejected through the nozzle 226 on the annular pipe 225 to form a high-speed jet.

[0110] When a high-speed jet impacts a high-temperature slag flow, the immense kinetic energy of the liquid flow overcomes the surface tension of the slag flow, breaking it into tiny droplets. Compared to gas granulation, since the granulation medium itself is a heat exchange medium, the high-temperature slag flow is completely enveloped by the liquid medium and undergoes intense contact heat exchange the instant it is broken up. This eliminates the heat loss process during the slag droplets' flight to the liquid surface, thus increasing the cooling rate. Simultaneously, because no external gas needs to be introduced, this avoids the subsequent complex waste gas separation and purification treatment, thereby reducing the energy consumption and complexity of the device's operation.

[0111] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. An integrated heat recovery device for blast furnace slag, characterized in that, include: The circulating heat exchange device (3) includes a support platform (31), on which an annular flow channel (32) is coaxially opened on the upper side. The annular flow channel (32) is used to contain the heat exchange medium. A rotary drive mechanism (33) is provided on the support platform (31). The rotary drive mechanism (33) is used to drive the support platform (31) to rotate. The slag output device (1) is located above the support platform (31) and is used to output high-temperature slag flow toward the annular flow channel (32); Granulation device (2), located between slag output device (1) and support platform (31), is used to break the high-temperature slag output from slag output device (1) into small slag droplets and let them fall into the annular flow channel (32); The slag discharge device (4) is located in the annular flow channel (32) and is used to intercept and discharge solid slag particles floating on the heat exchange medium. The medium heat exchange device (5) is located in the annular flow channel (32) and is used to recover the heat of the heat exchange medium; Fixed supports (10) are spaced apart on the outside of the bearing platform (31). The slag discharge device (4), the granulation device (2) and the medium heat exchange device (5) are all connected to the fixed supports (10).

2. The integrated heat recovery device for blast furnace slag according to claim 1, characterized in that, The granulation device (2) includes a rectifier (21), which is vertically arranged and located between the slag output device (1) and the support platform (31) in the vertical direction. A granulator (22) is provided at the lower end of the rectifier (21). The rectifier (21) is used to guide the high-temperature slag flow output by the slag output device (1) into the annular flow channel (32). The granulator (22) is used to break the high-temperature slag flow discharged from the rectifier (21) into small slag droplets and let them fall into the annular flow channel (32).

3. The integrated heat recovery device for blast furnace slag according to claim 2, characterized in that, The rectifier (21) includes a feed pipe (211), an intermediate tank (212), and a discharge pipe (213). The intermediate tank (212) is vertically arranged. One end of the feed pipe (211) is connected to the slag output device (1), and the other end is connected to the intermediate tank (212). The discharge pipe (213) is located at the bottom of the intermediate tank (212), and the upper end of the discharge pipe (213) is connected to the intermediate tank (212), while the lower end is arranged towards the annular flow channel (32).

4. The integrated heat recovery device for blast furnace slag according to claim 3, characterized in that, The granulator (22) includes a rotary driver (221) and a granulation turntable (223). The granulation turntable (223) is horizontally arranged and located below the discharge pipe (213). The lower end of the discharge pipe (213) is arranged towards the granulation turntable (223). The rotary driver (221) is coaxially connected to the granulation turntable (223) and the rotary driver (221) is used to drive the granulation turntable (223) to rotate.

5. An integrated heat recovery device for blast furnace slag according to claim 3, characterized in that, The granulator (22) includes a fluid source (224) and an annular tube (225). The fluid source (224) is connected to the annular tube (225). The annular tube (225) is located below the discharge pipe (213) and is coaxially arranged with the discharge pipe (213). A plurality of nozzles (226) are provided on the annular tube (225). The plurality of nozzles (226) are arranged sequentially at intervals along the circumference of the annular tube (225), and the plurality of nozzles (226) are all arranged toward the central axis of the annular tube (225).

6. The integrated heat recovery device for blast furnace slag according to claim 1, characterized in that, It also includes a sealing cover (6), which is located above the support platform (31) and is disposed on the support platform (31). The annular flow channel (32) is located inside the sealing cover (6), and the sealing cover (6) is rotatably connected to the support platform (31). The sealing cover (6) is connected to the fixed bracket (10), and the slag discharge device (4), the granulation device (2) and the medium heat exchange device (5) are all connected to the sealing cover (6).

7. An integrated heat recovery device for blast furnace slag according to claim 6, characterized in that, The support platform (31) is coaxially provided with a first water seal annular groove (34), the first water seal annular groove (34) is coaxially provided with the annular flow channel (32), and the annular flow channel (32) is located inside the first water seal annular groove (34); The sealing cover (6) is inserted into the first water seal ring groove (34), and the sealing cover (6) is spaced apart from the inner side wall of the first water seal ring groove (34). The first water seal ring groove (34) is filled with sealing liquid, and the lower end of the sealing cover (6) is located in the sealing liquid.

8. An integrated heat recovery device for blast furnace slag according to claim 6, characterized in that, It also includes an air intake pipe (71) and an inert gas source (72). The air intake pipe (71) is connected to the sealing cover (6), and one end of the air intake pipe (71) extends into the sealing cover (6), while the other end is connected to the inert gas source (72). It also includes an oxygen sensor and a controller. The oxygen sensor is disposed inside the sealed cover (6) and is used to detect the oxygen concentration inside the sealed cover (6). The controller is electrically connected to the oxygen sensor and the inert gas source (72) respectively. The controller is used to control the gas output of the inert gas source (72) according to the oxygen concentration detected by the oxygen sensor.

9. An integrated heat recovery device for blast furnace slag according to claim 6, characterized in that, It also includes an anode sacrificial rod (73), which is vertically arranged and located inside the sealing cover (6). The upper end of the anode sacrificial rod (73) is connected to the sealing cover (6), and the lower end of the anode sacrificial rod (73) extends into the annular flow channel (32) and contacts the heat exchange medium.

10. An integrated heat recovery device for blast furnace slag according to claim 1, characterized in that, It also includes a medium heating device (9), which is located in the annular flow channel (32) and is connected to the fixed bracket (10).

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