High-temperature steel slag full-process dry recycling and efficient heat energy recovery system and process

Abstract

The invention discloses a high-temperature steel slag full-process dry-process recycling and efficient heat energy recovery system and process. The problems of high-temperature steel slag full-process dry-process cooling and heat energy recycling are solved. According to the system and the process, crushed high-temperature steel slag is fed into a spiral cone heat exchange cold material machine at a constant speed, and the high-temperature steel slag enters a spiral discharge channel of a turntable under the action of gravity; in the rotating state of the rotating disc, the high-temperature steel slag advances in the spiral discharging channel, in the advancing process, the high-temperature steel slag exchanges heat with a cold medium in a heat exchange pipe laid at the bottom or / and the side wall of the spiral discharging channel, and the spiral heat exchange unit close to the feeding end and located in the high-temperature area of the rotating disc is connected into a high-temperature slag water cooling system. The spiral heat exchange unit which is close to the discharging end and located in the low-temperature area of the rotary disc is connected into a low-temperature slag water cooling system. Meanwhile, oxidation of iron elements in the cooling treatment process of the steel slag is reduced, and the recovery rate of iron in the subsequent steel slag micronization process is effectively increased.

Description

Technical Field

[0001] The invention relates to the technical field of cooling and heat energy recovery of high-temperature steel slag. Background Art

[0002] At present, the pretreatment processes of steel slag include hot stuffing, hot pouring, drum method and wind quenching method. Among them, the hot stuffing method is divided into two processes: pool hot stuffing and pressurized hot stuffing. However, the pool hot stuffing method adopts the process method of engineering mechanized operation, that is, using an excavator to scrape and crush the high-temperature steel slag poured into the hot stuffing pool, which requires further improvement of equipment level and environmental emissions. The pressurized hot stuffing method uses a mechanized roller crusher to crush the high-temperature steel slag, which has the advantages of equipment and high degree of automation, but the investment is relatively high, the airtightness is poor, and the crushing process uses water cooling to recover waste heat.

[0003] The tapping temperature of steel slag just out of the furnace is as high as 1200~1300℃, which contains a lot of heat energy. The specific heat capacity of molten steel slag is about 1.2kJ / (kg·℃). If the temperature of the molten slag before and after heat recovery is 1100℃ and 500℃ respectively, 1.2GJ of sensible heat can be recovered per ton of steel slag, which is approximately equivalent to the heat generated by the complete combustion of 41kg of standard coal, and the heat energy is extremely high.

[0004] Various units have actively conducted research on the effective recovery of high-temperature heat energy contained in high-temperature steel slag. For example, CN202211314933.9 discloses a method for efficient cooling and heat exchange of high-temperature steel slag, which includes the following: flattening and loading the steel slag, transferring the high-temperature steel slag to a fixed grate cooling bed through a slag tank, stirring and crushing the steel slag with a flattening and crushing roller, and evenly arranging the steel slag on the fixed grate cooling bed according to a certain thickness; cooling and crushing the steel slag, and sequentially using a fixed grate cooling bed and a mobile grate cooling bed to perform multi-stage cooling and crushing on the steel slag; cooling and unloading the steel slag. This method cools the high-temperature steel slag by air heat exchange, and obtains high-temperature air of 300°C to 500°C at the same time, and then reutilizes the heat in the high-temperature air, thereby realizing the recovery of heat energy in the high-temperature steel slag. Similarly, there is a high-temperature solid material efficient cooling and waste heat recovery system disclosed in the patent document CN 118189649 A, which is also a method for cooling high-temperature materials using air.

[0005] The above-mentioned technical defects of using air to cool high-temperature slag and recover heat energy are: 1. Since the specific heat capacity of water is 4.2kJ / (kg*K) and the specific heat capacity of air is about 1.4kJ / (kg*K), it means that the heat absorbed or released by water for every degree increase or decrease in temperature is about three times that of air. That is, the heat exchange effect of water is significantly higher than that of air.

[0006] 2. The high-temperature air or flue gas generated after heat exchange is further heat exchanged to obtain hot water. This heat exchange effect is relatively poor, that is, the thermal energy efficiency is relatively low, and supersaturated steam of high-quality heat source cannot be generated.

[0007] 3. In the prior art, air is used to directly cool the high-temperature steel slag. The iron element in the high-temperature steel slag will be partially oxidized in an oxygen-rich environment, resulting in a decrease in the recovery rate of refined iron powder in the subsequent steel slag, affecting the effectiveness of the system. Summary of the invention

[0008] In order to address the deficiencies in the prior art, the present invention provides a full-process dry resource utilization and efficient heat energy recovery system and process for high-temperature steel slag. The technology uses pure water as a heat exchange medium to directly and efficiently cool the high-temperature steel slag. At the same time, the by-products that can be obtained are steam and high-temperature hot water. The steam is used for industrial production, and the high-temperature hot water can be used for domestic water, thereby solving the full-process dry cooling of high-temperature steel slag and the recovery and reuse of heat energy.

[0009] The technical solution adopted by the present invention to solve the technical problem is: A full-process dry resource utilization and efficient heat energy recovery system for high-temperature steel slag, the system includes a crusher and a spiral cone heat exchange cooler, characterized in that: the crusher crushes the high-temperature steel slag to obtain high-temperature steel slag with a particle size that meets the set requirements, and continuously supplies the spiral cone heat exchange cooler with high-temperature steel slag with a particle size that meets the requirements; the spiral cone heat exchange cooler includes a turntable, a fixed cover and a turntable drive assembly, wherein a spiral discharge channel is provided on the conical surface of the turntable, the high point and the low point of the spiral discharge channel are respectively a feed end and a discharge end, and a heat exchange pipe is laid at the bottom or / side wall of the spiral discharge channel, the heat exchange pipe is arranged in sections to form multiple sections of independent spiral heat exchange units, which are close to the feed end and located in the high temperature zone of the turntable The spiral heat exchange unit is connected to a high-temperature slag water cooling system, in which the high-temperature steel slag is cooled from more than 1100°C to not more than 300°C in the high-temperature zone, and the waste heat of the high-temperature slag water cooling system is recovered to obtain steam; the spiral heat exchange unit close to the discharge end and located in the low-temperature zone of the turntable is connected to a low-temperature slag water cooling system, in which the medium- and high-temperature steel slag from the high-temperature zone is cooled to low-temperature steel slag below 120°C and discharged, and the waste heat of the low-temperature slag water cooling system is recovered to obtain hot water; the fixed cover is fixedly installed directly above the turntable, and a conical space for cooling and exchanging high-temperature steel slag is formed between the fixed cover and the turntable; the turntable drive assembly is connected to the turntable and drives the turntable to rotate, and the high-temperature steel slag is pushed along the spiral discharge channel during the rotation.

[0010] The spiral heat exchange unit is formed by arranging a plurality of heat exchange tubes in parallel in the height direction, and is located at a wall plate forming a spiral discharge channel, and a fixed rib is arranged on the back side of the wall plate to enhance the fixing strength with the turntable.

[0011] The spiral heat exchange unit is formed by laying a plurality of heat exchange tubes at the bottom of the spiral discharge channel.

[0012] Ribs are arranged on both sides of the spiral discharge channel, and the spiral heat exchange unit is formed by laying a plurality of heat exchange tubes on the channel bottom and / or the rib side walls of the spiral discharge channel.

[0013] The height of the wall plates on both sides of the spiral discharge channel gradually decreases from the feed end to the discharge end.

[0014] The discharge end of the spiral discharge channel is located on one side of the outer periphery of the turntable. A collection groove is arranged in a ring on the outer side of the turntable, and a drop opening is provided on the collection groove. A plurality of scraper plates are fixed on the outer periphery of the edge of the turntable. The scraper plates are welded and fixed on the turntable. During the rotation of the turntable, the scraper plates are driven to slide along the collection groove. During the scraping process, the steel slag moves along the collection groove and when it reaches the drop opening, the steel slag is discharged from the drop opening of the aggregate groove.

[0015] The turntable drive assembly is a chain drive assembly. The turntable body is a high-temperature resistant structure formed by a steel plate and refractory bricks laid on the surface of the steel plate. An I-beam steel frame is welded below the steel plate. A track and a metal chain are provided at the bottom of the I-beam steel frame, which are connected to the chain drive assembly and drive the turntable to rotate.

[0016] It also includes a slag buffer bin, which is located between the crusher and the spiral cone heat exchange cooler and is equipped with a blast system for supplying cold air into the slag buffer bin to temporarily store and buffer the high-temperature slag and perform quantitative feeding.

[0017] A high temperature resistant spiral material distribution plate is arranged in the steel slag buffer bin, and the spiral material distribution plate is provided with spiral ribs. The driving motor is driven by a bevel gear transmission under the spiral material distribution plate to control the feeding speed of the steel slag buffer bin.

[0018] The crusher includes a power plate assembly, a power steel roller assembly, a slag aggregate assembly, and a crushing chamber assembly; the power plate assembly includes a driving motor, a bevel gear reduction and transmission mechanism, a plate and a scraper, wherein the scraper is fixed at the edge of the plate, the driving motor is horizontally arranged and connected to the transmission mechanism through a bevel gear reduction and drives the plate to rotate horizontally; the power steel roller assembly located directly above the plate includes a crushing roller, a bearing assembly, a hydraulic motor and a water medium rotary joint, wherein both ends of the crushing roller in the length direction are mounted on a slider through two sets of bearing assemblies, the slider is mounted on the equipment frame through the linear sliding fit, a linear hydraulic lifting cylinder is arranged between the slider and the equipment frame, a water medium cooling channel is provided inside the crushing roller, a water medium rotary joint is installed at one end of the crushing roller, a hydraulic motor is installed at the other end of the crushing roller, and the water medium cooling channel is externally connected to a water cooling system; the outer shell of the crushing chamber assembly covers the space above the plate and the crushing roller and forms a space for crushing and crushing, and a slag feeding port and a hot air exhaust port are arranged at the top of the outer shell.

[0019] The slag aggregate assembly includes an aggregate trough, a discharge plate, and a discharge port, wherein the aggregate trough is arranged on the outer periphery of the roller disc ring, and the cross-section of the aggregate trough is U-shaped and a blast port is arranged on the side of the aggregate trough, and at least one discharge port is arranged at the bottom of the aggregate trough, and a discharge plate is arranged directly below the discharge port, wherein the scraper is inserted into the aggregate trough to scrape off the crushed slag in the aggregate trough.

[0020] An upwardly protruding conical material distribution protrusion is arranged at the center of the turntable, a spiral protrusion is arranged in the conical material distribution protrusion, an air distribution pipe is arranged at the lower side of the conical material distribution protrusion, and an air distribution nozzle is arranged on the conical material distribution protrusion, and the air distribution pipe is connected to an external blower.

[0021] A full-process dry process for recycling high-temperature steel slag and efficient heat recovery, characterized in that: The first step is to use a crusher to crush the high-temperature steel slag and obtain high-temperature steel slag with a particle size that meets the set requirements, and continuously supply the high-temperature steel slag with a particle size that meets the requirements to the spiral cone heat exchange cooler; In the second step, the crushed high-temperature steel slag is uniformly fed into the spiral cone heat exchange cold material machine. The high-temperature steel slag enters the conical space between the fixed cover and the turntable under the action of gravity and falls into the spiral discharge channel of the turntable. The spiral cone heat exchange cold material machine comprises a turntable, a fixed cover and a turntable drive assembly, wherein a spiral discharge channel is provided on the conical surface of the turntable, and the high point and the low point of the spiral discharge channel are respectively the feed end and the discharge end. When the turntable rotates, the high-temperature steel slag advances in the spiral discharge channel. During the advancement process, the high-temperature steel slag exchanges heat with the cold medium in the heat exchange tubes laid at the bottom and / or the side wall of the spiral discharge channel. The heat exchange tubes are arranged in sections and form multiple sections. This independent spiral heat exchange unit divides the area of ​​the turntable into a high-temperature zone and a low-temperature zone according to different positions, wherein the spiral heat exchange unit near the feed end and located in the high-temperature zone of the turntable is connected to a high-temperature slag water cooling system, in which the high-temperature steel slag is cooled from higher than 1100°C to no higher than 300°C, and at the same time, the cold medium in the high-temperature slag water cooling system is recovered through a flash tank to obtain high-temperature steam; the spiral heat exchange unit near the discharge end and located in the low-temperature zone of the turntable is connected to a low-temperature slag water cooling system, in which the medium-high temperature steel slag from the high-temperature zone is cooled to low-temperature steel slag below 120°C and discharged, and at the same time, the cold medium in the low-temperature slag water cooling system is recovered to obtain hot water; The turntable driving assembly is connected to the turntable and drives the turntable to rotate. The slag discharge speed of the low-temperature steel slag is controlled by controlling the rotation of the turntable. During the rotation, the high-temperature steel slag is pushed along the spiral discharge channel.

[0022] A temperature sensor is set at the discharge end to detect the temperature of the slag discharged from the discharge end. When the detected temperature is lower than the set temperature threshold, the speed of the turntable is maintained at a constant speed. When the detected temperature is higher than the set temperature threshold, the speed of the turntable is reduced until the detected temperature is lower than 120°C.

[0023] The beneficial effects of the present invention are: 1. During the implementation of this system and process, the high-temperature steel slag is indirectly cooled by conduction with the soft water medium in the metal spiral tube in a relatively closed space. There is no need to blow a large amount of air into the cooling space, which avoids the presence of a large amount of fresh, high-oxygen flowing air in the cooling space, thereby reducing the oxidation of iron elements in the steel slag during the cooling process, effectively improving the iron recovery rate in the subsequent steel slag micronization process, and is conducive to the formation of high-grade cooled steel slag.

[0024] 2. This system and implementation process divides the heat exchange area into a high temperature area and a low temperature area according to the temperature. The high temperature area cooperates with the flash tank to form supersaturated steam and obtain high-quality industrial steam. The low temperature area obtains hot water, which realizes the cooling of high-temperature slag, realizes the graded recovery of heat, and obtains some high-quality supersaturated steam.

[0025] 3. In this system and implementation process, there is no direct contact between the high-temperature steel slag and the cooling water. It is a non-contact heat exchange technology. Therefore, there is no need to equip the dust removal system or small air volume dust removal in this process. By utilizing the hot air expansion effect of the high-temperature steel slag, the system can always maintain a slight negative pressure in the heat exchange space.

[0026] 4. Through the implementation of this process, taking general high-temperature steel slag as an example, one ton of steel slag can theoretically produce 425kg of steam when the temperature drops from 1100℃ to 300℃, and the actual amount of supersaturated steam produced by one ton of steel slag is not less than 200kg. This high-temperature supersaturated steam can be widely used in industrial production, for example, steam power generation equipment, steam drying equipment, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a layout diagram of a high-efficiency heat recovery system according to Example 1 of the present invention.

[0028] Figure 2 This is a layout diagram of a high-efficiency heat recovery system according to the second embodiment of the present invention.

[0029] Figure 3 This is the structural diagram of the spiral cone heat exchange cooler.

[0030] Figure 4 This is the structural diagram of the spiral cone heat exchange cooler.

[0031] Figure 5 This is the unfolded plan view of the turntable with a spiral discharge channel.

[0032] Figure 6 This is the diagram of the high-temperature slag water cooling system in the high-temperature area.

[0033] Figure 7 This is the diagram of the low-temperature slag water cooling system in the low-temperature zone.

[0034] Figure 8 Schematic diagram of the three-dimensional structure of the spiral heat exchange tube.

[0035] Fig. 9 This is a partial cross-sectional view of the turntable corresponding to style 1.

[0036] Fig.10 This is a partial cross-sectional view of the turntable corresponding to style two.

[0037] Fig.11 This is a partial cross-sectional view of the turntable corresponding to style three.

[0038] Fig.12 This is a partial cross-sectional view of the turntable corresponding to style four.

[0039] Fig.13 A partial view of the turntable steel frame and the drive mechanism underneath it.

[0040] Fig.14 This is a structural diagram of a slag buffer bin.

[0041] Fig.15 It is a top view of the high temperature resistant roller continuous crusher.

[0042] Fig.16 for Fig.15 A--A section view.

[0043] Fig.17 for Fig.15 Middle B--B floor plan.

[0044] Fig.18 It is a side view of the high temperature resistant roller continuous crusher.

[0045] Fig.19 This is the schematic diagram of the water cooling system of the crusher. DETAILED DESCRIPTION

[0046] This embodiment introduces a full-process dry resource utilization and efficient heat recovery system and process for high-temperature steel slag. The technical goals to be achieved by this system and process are: First, the high-temperature steel slag above 1000 degrees is reduced to no more than 150 degrees, and the direct spraying process is not used. The steel slag is always kept dry during the cooling process, there is no air convection in the cooler, and the high-temperature steel slag is placed in a low-oxygen environment to prevent the pure iron component in the steel slag from being secondary oxidized, thereby laying the foundation for the subsequent reuse of the steel slag. Second, in the heat exchange process, as much supersaturated steam as possible is generated. The more supersaturated steam is generated, the greater the value of heat recovery. Third, in the implementation of the equipment, the three-dimensional equipment is realized as much as possible, and it is arranged along the gravity direction to reduce the floor space and equipment investment.

[0047] Embodiment 1: The first technical route of the system is based on the combined use of the slag flattening crusher, the slag buffer bin and the spiral cone heat exchange cooler, as well as the high-temperature slag water cooling system and the low-temperature slag water cooling system as heat recovery equipment. The crusher, the slag buffer bin and the spiral cone heat exchange cooler are rationally arranged in three-dimensional space from top to bottom in the direction of gravity to achieve uninterrupted production. The process diagram is referenced Figure 1 Combination shown.

[0048] The crusher 200 in this embodiment can be supplied by existing mature technology manufacturers, such as a slag leveling crusher.

[0049] The slag buffer bin 300 below the crusher 200 is provided with a high-temperature resistant spiral distribution plate 330 inside, and the spiral distribution plate is provided with spiral ribs 331. The feeding speed of the slag buffer bin is controlled by a driving motor 350 through a bevel gear transmission 340 below the spiral distribution plate, which has the function of temporarily storing slag and quantitative feeding.

[0050] refer to Fig.14 The slag buffer bin 300 in this embodiment is used for temporary storage, buffering and quantitative feeding of slag from the roller crusher to the spiral cone heat exchange cooler 400. The time is relatively short, generally not more than 30 minutes, and the inner and outer walls of the slag buffer bin are protected against high temperature.

[0051] Furthermore, an air supply duct 310 and an air return chamber 320 may be provided in the slag buffer bin 300, and the temperature accumulation of the accumulated slag may be controlled by slowly blowing cold air into the buffer bin to avoid adhesion of the slag.

[0052] A discharge port is provided at the lower side of the slag buffer bin 300 , and a spiral cone heat exchange cooler 400 is provided below the discharge port.

[0053] The above-mentioned slag buffer bin 300 is selected according to actual conditions. When the slag buffer bin is not configured, the spiral cone heat exchange cooler is directly installed below the crusher, referring to the situation shown in Example 2.

[0054] The structure of the spiral cone heat exchange cooler refers to the second embodiment, and this embodiment will not be described separately.

[0055] Embodiment 2: The second technical route of the system is based on the combined use of a crusher and a spiral cone heat exchanger cooler, that is, the high-temperature slag produced after crushing is directly discharged into the spiral cone heat exchanger cooler for heat exchange, and a slag buffer bin is no longer provided. In this case, a buffer space can be provided at the feed port of the spiral cone heat exchanger cooler to control the feeding of the slag material. This process reference Figure 2 The combination shown in the figure needs to be matched with a crusher that can produce continuously. The general crusher has intermittent discharge. Figures 15 to 19 A special crusher device is given as an example.

[0056] Taking the processing route as a clue, the detailed structure, function and operation of each component equipment are introduced in detail below.

[0057] The slag from the steelmaking furnace is discharged by a slag pot 100 , and the high-temperature slag in the slag pot 100 is slowly dumped into a crusher 200 by means of transportation and hoisting.

[0058] The particle size of the high-temperature steel slag produced by the crusher 200 is required to be less than 40 mm. The steel slag blocks larger than 40 mm are intercepted or processed separately to meet the use requirements of the subsequent spiral cone heat exchange cold material machine. The 40 mm is exemplary and can also be a non-integer, such as 45.5 mm. In theory, the particle size of the high-temperature steel slag produced by the crusher can be adjusted according to actual conditions. The smaller the particle size, the higher the efficiency of waste heat recovery. In theory, 100 mm is the maximum value, which can be set to 80 mm, 50 mm, 30 mm and other specifications. This is set by the manufacturer and depends on the parameter setting of the crusher. No matter what, it is within the scope of protection of the present invention.

[0059] The crusher is a high temperature resistant continuous crusher, and the structure of the crusher 200 is as follows: according to the idea of ​​functional division, it includes an equipment frame 210, a power plate assembly 220, a power steel roller assembly 230, a steel slag aggregate assembly 240, a crushing chamber assembly 250, a man-mounted platform 260, a blast system 270 and a water cooling system 280. The present invention does not make too many restrictions on the style and outline of the equipment frame. The equipment frame 210 in the figure is an example made for the specific and visual purpose of the equipment, and various structural modifications should be protected.

[0060] refer to Fig.15 The equipment frame in this embodiment has a manned platform 260, which is used for inspection and maintenance of the equipment. The bottom of the equipment frame 210 is fixed to a dedicated foundation using a ground anchor 211 to ensure firmness and reliability. A power plate assembly 220 and a power steel roller assembly 230 are installed at the equipment frame 210, wherein the power plate assembly 220 is at the bottom and the power steel roller assembly is at the top. The combination of the two forms a crushing cavity and a crushing path for high-temperature steel slag, and realizes continuous feeding and continuous discharging, uninterrupted production, and cooling design is performed on the core components to meet the high temperature resistance requirements.

[0061] refer to Fig.16 The power milling disc assembly 220 includes a driving motor 221, a coupling 222, a bevel gear reduction and transmission mechanism 223, a milling disc 224 and a scraper 225. The driving motor 221 is horizontally arranged, and the power shaft of the driving motor and the power shaft in the bevel gear reduction and transmission mechanism 123 are connected through the coupling. The vertical output shaft of the bevel gear reduction and transmission mechanism 223 is mechanically connected and drives the milling disc 224 to rotate horizontally. In other words, the milling disc 224 is rotatably installed just above the bevel gear reduction and transmission mechanism, and the driving motor can drive the above-mentioned milling disc to rotate in a circular motion, which is dynamic.

[0062] Furthermore, the roller disc 224 is a cast iron part, especially a high temperature resistant alloy cast iron part. In terms of spatial structure, the roller disc 224 has a casting cavity 2241, the existence of which enables the roller disc to form a casting body with uniform wall thickness, and the roller disc is prevented from overheating by implementing different water cooling and air cooling methods on the casting cavity for temperature control.

[0063] Air cooling method, reference Fig.17 An air cooling pipe 2242 is arranged in the casting cavity 2241, and an air nozzle is provided on the air cooling pipe to cool the inner wall of the casting cavity by air jet. Since the rolling disc is a rotating component, an air path is provided on the vertical output shaft of the bevel gear reduction and transmission mechanism. A pneumatic rotary joint is installed at the lower end of the air path, and the upper end is connected to the air cooling pipe, and the pneumatic rotary joint 271 is connected to the blowing system 270, that is, the above-mentioned rolling disc is continuously cooled by the blowing system.

[0064] Water cooling method, reference Fig.19 The inner cavity of the milling disc 224 is water-cooled. Specifically, a water-cooling channel 282 is provided in the vertical main shaft of the bevel gear reduction and transmission mechanism. The water-cooling channel includes a water inlet channel and a water return channel. A rotary joint 283 is provided at the bottom end of the vertical main shaft and connected to the water cooling system 280 of the crushing roller. The milling disc is cooled by water circulation. The milling disc in this embodiment omits the design of the high-temperature resistant material layer. The main body temperature of the milling disc is controlled below 300 degrees Celsius by water cooling, so there is no need to set a high-temperature resistant insulation layer.

[0065] refer to Fig.16 and Fig.17 When there is no water cooling system, the upper surface of the rolling disc 224 is a rolling working surface composed of refractory materials, and the side of the rolling disc is a scraper installation surface. Specifically, it is coated with a refractory material layer 2243, which can be a laid refractory brick or refractory coating, such as a refractory high-alumina brick. The refractory material layer is coated on the upper surface and the annular side of the rolling disc, forming a refractory coating on the cast iron rolling disc, thereby preventing the cast iron rolling disc from directly contacting with high-temperature steel slag.

[0066] Furthermore, an annular flange 2244 is provided at the edge of the rolling working surface, and a baffle plate 2245 made of refractory material is fixed on the inner wall of the shell of the power steel roller assembly on the upper side corresponding to the flange. The baffle plate is also annular and forms a uniform equal gap with the flange. The gap between the baffle plate and the flange determines the particle size of the steel slag after rolling and crushing. Only steel slag that meets the particle size requirements can pass through the gap between the baffle plate and the flange and fall.

[0067] Furthermore, the refractory material layer 2243 includes an annular refractory cover and a downward pressing annular body, through which the refractory cover is firmly fixed on the mill plate. Fig.17 .

[0068] Furthermore, an upwardly protruding cone 2246 is provided at the center position of the working surface of the milling disc, and the high point of the cone 2246 is lower than the lowest point of the steel roller in the power steel roller assembly, forming the central position expression of the milling disc. In other words, the central axis of the cone and the central axis of the milling disc are arranged in a colinear manner with each other. This arrangement allows the steel slag materials on both sides of the cone to be isolated from each other during the rotation of the milling disc 224, and prevents the steel slag from gathering toward the center. The cone 2246 is not a necessary configuration, and the technical solutions of setting or not setting the cone 2246 are all within the protection scope of the present invention.

[0069] There are multiple scrapers 2245, which are evenly installed on the annular wing plate 2247 on the side of the grinding disc and are arranged vertically. The scrapers discharge the high-temperature steel slag in the aggregate trough.

[0070] The slag aggregate assembly 240 includes an aggregate trough 241, an air supply pipe 242, a discharge plate 243, and a discharge port 244, wherein the aggregate trough and the air supply pipe are annular structures, and are arranged concentrically with the above-mentioned millstone, that is, the aggregate trough 241 is arranged at the periphery of the millstone annular shape, and the cross section of the aggregate trough is U-shaped, and at least one discharge port 244 is arranged at the bottom of the aggregate trough 241, and the discharge port 244 is used to discharge the slag, and a discharge plate 243 is arranged directly below the discharge port, and the discharge plate is inclined and directional. The scraper 2245 is inserted into the aggregate trough 241 to scrape the crushed slag in the aggregate trough.

[0071] Furthermore, when the bottom of the aggregate trough 241 is designed as an inclined surface, for example, a 20-degree slope, the design of the scraper can be omitted, and this design should also fall within the protection scope of the present invention.

[0072] The above-mentioned air supply pipe 242 is located on one side of the aggregate trough, for example, it is set on the inner side or the outer side. In this embodiment, it is exemplarily set on the inner side. The air supply pipe 242 and the aggregate trough are fixedly connected, and a blast port 245 is provided on the corresponding side of the aggregate trough 241. The blast port is connected to the air supply port on the air supply pipe, and the air supply pipe 242 is connected to the blast system 270, that is, cold air is blown into the aggregate trough by a blower. The blown cold air flows upstream to cool the falling high-temperature steel slag to prevent the high-temperature steel slag from sticking in the aggregate trough.

[0073] The aggregate trough 241 in this embodiment is a composite structure consisting of a refractory metal shell and a high-temperature resistant material layer. The aggregate trough is fixed to the equipment frame 210 by welding with steel sections, and the upper part of the aggregate trough 241 is the shell of the crushing chamber assembly, and the two are sealedly connected, and the sealed connection is a soft connection or a rigid connection.

[0074] The power steel roller assembly 230 includes a crushing roller 231, a bearing assembly 232, a hydraulic motor 233 and a water medium rotary joint 234, wherein the necks at both ends of the crushing roller 231 in the length direction are installed on the slider 212 of the equipment frame 210 through two sets of bearing assemblies 232, and the slider 212 is part of the slider assembly. The so-called slider assembly refers to a vertically arranged linear slide rail 213 on the equipment frame, and a slide groove is arranged on the linear slide rail. The above-mentioned slider is installed on the equipment frame 210 through the linear sliding fit, and a linear hydraulic lifting cylinder 214 is arranged between the above-mentioned slider and the equipment frame. The linear hydraulic lifting cylinder 214 is arranged vertically to lift the height of the slider, that is, through the setting of the linear hydraulic lifting cylinder, the height of the crushing roller can be raised and lowered.

[0075] The crushing roller 231 has a water medium cooling channel 2311 inside, and a water medium rotating joint 234 is installed at one end of the crushing roller. The flow direction of the liquid cooling medium is referenced to Fig.19 , that is, the temperature of the crushing roller is controlled by water cooling, and the temperature control mainly has a cooling effect. A hydraulic motor 233 is installed at the other end of the crushing roller, that is, the hydraulic motor is installed between the end of the crushing roller and the equipment frame steel frame, and the crushing roller is driven by the hydraulic motor to rotate mechanically, that is, the hydraulic motor 233 is the power component of the crushing roller.

[0076] Roller teeth 2312 are provided on the above-mentioned crushing roller 231. The roller teeth are made of high-temperature resistant alloy material and are fixed on the crushing roller. This design allows the roller teeth to be replaced after being worn, thereby reducing the use and maintenance costs.

[0077] Furthermore, the water medium cooling channel means that the water inlet channel of the cooling channel is located at the center of the crushing roller, and the water return channel is located at the inner wall annular space of the crushing roller, forming a structure of central water inlet and peripheral water return. A water medium rotary joint with water inlet and water outlet channels is configured to realize water circulation. In this process, normal temperature water is connected to the water cooling system 280 through the water medium cooling channel. Fig.19 The water cooling system 280 preferably uses a plate heat exchanger 281 or a cooling tower 2811 for cooling.

[0078] The crushing chamber assembly 250 is wrapped around the periphery of the working section of the crushing roller. The crushing chamber assembly 250 is a high temperature resistant shell component. The shell is a composite structure composed of a metal plate and a refractory lining, which meets the requirements of installation and fire resistance. The shell of the crushing chamber assembly 250 covers the space above the grinding plate, and the interface between the shell and the crushing roller is a soft connection. The so-called soft connection means that a flexible refractory material is set at the interface between the shell and the crushing roller. Fig.16 This setting can meet the travel requirements of the crushing roller jacking and ensure that a good sealing effect is maintained during the jacking process without leaking slag.

[0079] The shell is a hood-like structure consisting of a top and a side, and a slag feeding port 251 and a hot air exhaust port 252 are arranged on the top of the shell. The number of slag feeding ports 251 can be one or more. There can be one or more hot air exhaust ports 252, which are used to discharge the hot air in the crushing chamber to form an air cooling system.

[0080] The cooling air in the crushing chamber can be formed by blowing air, that is, actively supplying air, for example Fig.16 The structure shown can also be formed by exhausting air, for example, an exhaust fan (not shown in the figure) is set at the hot air exhaust port, and air circulation can also be formed. When the exhaust fan is working, the air supply pipe on one side of the aggregate trough can be omitted, that is, only air inlet microholes are set on the aggregate trough. The hot air temperature obtained by the above air cooling is usually higher than 200 degrees Celsius. Furthermore, the heat energy contained therein can be recovered and reused through an air-to-air heat exchanger.

[0081] The core structure of the spiral cone heat exchange chiller of this embodiment is a turntable 410 with a spiral discharge channel 420, and the spiral discharge channel 420 is formed in the following manner: the turntable 410 is a conical profile component, and the high point at the center of the turntable is the feed end 411, and the low point at the circumference of the turntable is the discharge end 412, and a spiral discharge channel 420 arranged from top to bottom is formed by a heat exchange wall 430 between the feed end and the discharge end, and the spiral discharge channel 420 spirals down from the oblique upper part of the turntable until it reaches the edge of the turntable 410.

[0082] The heat exchange wall 430 described in this embodiment is formed by splicing multiple independent spiral heat exchange units 431, and the splicing seam 4311 between two spiral heat exchange units 431 is as small as possible, or the splicing seam is caulked, for example, by mud sealing. When the splicing seam is small enough, mud sealing is not required. The height of the heat exchange wall on both sides of the spiral discharge channel is gradually reduced from the feed end to the discharge end 412, referring to Figure 3As shown, that is, the height of the spiral heat exchange unit 431 located in the high temperature zone is significantly greater than the height of the spiral heat exchange unit 431 located in the low temperature zone. This design is conducive to forming a sufficient heat exchange path and obtaining enough supersaturated high temperature water.

[0083] As described above, the heat exchange wall 430 is formed by splicing a plurality of independent spiral heat exchange units 431. Figure 8 Each spiral heat exchange unit 431 is composed of heat exchange tubes 432 arranged in parallel in the height direction, for example, a plurality of heat exchange tubes are welded to form a thick wall-shaped spiral heat exchange unit 431. Each section of the spiral heat exchange unit is arranged 360 degrees, and the beginning and end are not closed, and the radius of the starting end is small and the radius of the ending end is large, forming a pitch of the above-mentioned heat exchange wall.

[0084] By introducing desalted and softened water medium into the heat exchange tube 432 of the spiral heat exchange unit, and making the desalted and softened water medium contact and flow under the action of the booster pump, heat exchange is carried out through the tube wall, and the desalted and softened water medium in the multiple heat exchange tubes 432 of each spiral heat exchange unit is basically in an isothermal state. Thus, heat exchange between high-temperature steel slag and desalted and softened water medium is realized. The heat exchange process makes the high-temperature steel slag lower the temperature and makes the desalted and softened water medium rise in temperature, thereby realizing the conversion of the sensible heat of the high-temperature steel slag into high-temperature water (desalted and softened water medium) of a certain pressure and temperature. Finally, the high-temperature slag water cooling system is used to flash the high-temperature and high-pressure hot water to produce saturated steam of a certain quality, and the obtained high-quality saturated steam is used as industrial steam for industrial production. Alternatively, the low-temperature slag water cooling system is used to produce low-quality hot water for life or production use.

[0085] refer to Figure 3 / 4 and Figure 7 / 8The above-mentioned spiral heat exchange units are multiple, and are connected end to end to form a nearly continuous spiral discharge channel 420. The spiral discharge channel 420 is the propulsion path of the high-temperature steel slag, that is, the high-temperature steel slag is propulsed in this spiral discharge channel 420. Through the design of the spiral structure, the high-temperature steel slag has a sufficiently long heat exchange path, which is of positive significance for ensuring the heat exchange effect and can achieve miniaturization of the equipment.

[0086] To further explain, the heat exchange area in the spiral cone hot transfer cooler is divided into a high temperature area and a low temperature area. Figure 5A schematic diagram of a dividing line L is given in the figure, which is virtual and does not exist in the actual space. The dividing line is only displayed to facilitate the understanding of the present technology. The high temperature zone is a circular ring area near the feed end 411, and the low temperature zone is a circular ring area near the discharge end 412. The spiral heat exchange pipes in the two areas each form an independent cooling pipe system, that is, they form independent closed loops through different booster pumps and pipes. The water circulation pipeline in the high temperature zone is connected to the high temperature slag water cooling system, and the water circulation pipeline in the low temperature zone is connected to the low temperature slag water cooling system. The temperature is lowered by grading and different supersaturated high temperature hot water and ordinary hot water are obtained. The goal of high temperature zone A is to cool the high temperature steel slag from more than 1000°C to about 300°C, and at the same time obtain high pressure, high temperature, supersaturated hot water with a pressure of 2.0MPa and a temperature of 200°C. This goal is achieved through the heat exchange of the heat exchange tube 432 in the high temperature zone, and the desalted and softened water medium in the spiral heat exchange pipe in this area is based on the reverse flow direction. The so-called reverse flow means that the flow direction of the desalted and softened water medium is opposite to the flow direction of the high temperature steel slag in the spiral discharge channel 420, so as to obtain the best heat exchange effect. This heat exchange effect is not only reflected in the heat exchange efficiency (stronger), but also in the outlet water temperature of the high temperature, high pressure, supersaturated hot water (higher). Reference Figure 6 The high-temperature supersaturated hot water generated by heat exchange enters the steam generator 500, and the pressure is reduced and flashed to generate steam. The operating pressure of the steam generator is 0.8MPa, and saturated steam and saturated condensate at 175.4℃ are generated. The generated saturated steam enters the steam network through the branch line for use, and the saturated condensate (desalted softened water) returns to the spiral cone hot transfer cooler through the booster circulation pump for steel slag heat exchange again. After the temperature rises to 200℃ again, it enters the steam generator for flash evaporation to generate steam, and the cycle is repeated to produce stable saturated steam. At the same time, it is necessary to continuously replenish the water volume reduced after flash evaporation to maintain the overall thermal balance and material balance.

[0087] The low temperature zone B of the screw cone hot transfer cooler, reference Figure 7 , the medium-high temperature steel slag of about 300°C is further cooled to low-temperature steel slag below 120°C in the area, and hot water is generated at the same time. The temperature of the hot water obtained by heat exchange in the low-temperature zone B is theoretically higher than 60°C. The hot water can be used to heat domestic or production water through the heat exchange of the plate heat exchanger 600, such as warm water for domestic and production use in the factory area, to meet the requirements of subsequent transportation and storage. If there is no need to store hot water, the hot water generated by heat exchange can also be transported to the low-temperature zone again by a circulating pump after the hot water temperature is reduced to below 45°C through a cooling tower 610 for circulating heat exchange, forming an independent system. The water system uses a cooling tower for closed circulation.

[0088] refer to Figure 5The discharge end 412 of the spiral discharge channel 420 is located on one side of the outer periphery of the turntable. The outer side of the turntable is provided with an annular aggregate groove, and the aggregate groove 440 is used to collect the slag material discharged from the outer periphery of the turntable. A drop opening 441 is provided at a certain position of the aggregate groove 440. At the same time, a plurality of scraper plates 450 are fixed on the outer periphery of the edge of the turntable 400, that is, the scraper plates are welded and fixed on the turntable 400, and the scraper plates are located in the aggregate groove and scrape the slag aggregate in the aggregate groove. The specific process is that when the turntable rotates, the scraper plates 450 are driven to slide along the aggregate groove and scrape the slag in the aggregate groove. During the scraping process, the slag moves along the aggregate groove and when it reaches the drop opening, the slag is discharged from the drop opening 441 of the aggregate groove.

[0089] The above-mentioned high-temperature slag water cooling system consists of a water supply tank (pipe), a flash tank, a circulation pump, a pipeline, a valve, an instrument, and a PLC intelligent control module. The water supply tank stores desalinated softened water medium. Figure 6 , where the PLC intelligent control module can automatically adjust the power of the booster pump according to the water temperature. This belongs to the existing technology and will not be described in detail.

[0090] The above-mentioned low-temperature slag water cooling system is composed of a water pipe, a booster pump, a plate heat exchanger, a cooling tower, pipes, valves, instruments, and a PLC intelligent control module. Figure 7 , where the PLC intelligent control module can automatically adjust the power of the booster pump according to the water temperature. This belongs to the existing technology and will not be described in detail.

[0091] The spiral cone heat exchange cooler realizes cooling of the high-temperature slag and heating of the water medium by heat conduction between the water medium in the spiral heat exchange pipe and the high-temperature slag outside the pipe.

[0092] The heat exchange space in the spiral cone heat exchanger can produce high-quality supersaturated hot water and supersaturated steam by performing segmented heat exchange in each circumference as a heat exchange unit, and directly obtain high-quality steam heat source. The high-quality supersaturated steam can be directly used for production. At the same time, low-quality hot water is obtained in the low-temperature area.

[0093] The main body of the turntable 400 is a high temperature resistant structure formed by a steel plate 401 and refractory bricks 402 laid on the surface of the steel plate. An I-beam steel frame 403 is welded below the steel plate 401 to form a supporting structure. Figure 3 and Fig.13The bottom of the I-beam steel frame is provided with a track 404 and a metal chain 405, wherein the track is arranged in four groups and in the center of a circle and is installed at the bottom of the I-beam steel frame. The metal chain is installed at the side position of the bottom of the I-beam steel frame and surrounds the side of the I-beam steel frame. A ground wheel assembly 406 is installed on the foundation below the above-mentioned track to support the I-beam steel frame, wherein at least one group of ground wheel assemblies has a constraint performance, so that the I-beam steel frame can rotate along the track and the ground wheel. At least one group of chain drive assemblies 407 is installed on the foundation, specifically, the chain drive assembly includes a drive motor, a reducer and a metal sprocket, wherein the drive motor and the reducer in this embodiment are installed vertically, and the metal sprocket is installed horizontally on the above-mentioned speed reducer power output shaft, the metal sprocket is meshed with the above-mentioned metal chain, and drives the above-mentioned I-beam steel frame to rotate, and the above-mentioned turntable is driven to rotate during the rotation of the I-beam steel frame, so the chain drive assembly 407 is a rotating power drive module. A side stop limit assembly 408 is provided at the inner annular edge of the steel frame for limiting the position in the horizontal direction.

[0094] The power drive module may also have other styles, such as driven by a gear ring transmission, which will not be described in detail one by one, and all are within the scope of the implementation of the present invention.

[0095] It also includes a fixed cover 700, which is fixedly installed above the turntable through a steel structure 710. The fixed cover also has a conical profile. An equally spaced conical space 720 is formed between the fixed cover and the turntable. The space is also a high-temperature and high-heat space. Based on the principle of facilitating maintenance, the heat exchange space should have sufficient space.

[0096] Furthermore, the fixed cover 700 is a composite structure composed of a metal shell and internal refractory bricks, wherein the metal shell has the advantage of easy molding, and the refractory bricks have the advantage of high temperature resistance. It is determined according to needs whether to set an insulation layer on the outside of the fixed cover, such as insulation rock wool. Or, it is determined according to needs whether to lay a metal pipe on the inner surface of the fixed cover 400 and add corresponding water cooling facilities to water-cool the fixed cover.

[0097] The physical center position of the fixed cover 700 is the feed port 730, that is, the feed port for high-temperature steel slag. Below the feed port is the physical center position of the turntable 400. In order to facilitate the deceleration of the steel slag and reduce the vertical impact on the turntable, an upwardly protruding conical material distribution protrusion 740 is arranged at the center position of the turntable corresponding to the feed port. The conical material distribution protrusion faces the feed port of the fixed cover. When the high-temperature steel slag falls downward under the action of gravity, the high-speed falling steel slag collides with the conical material distribution protrusion and rebounds the steel slag to the side, and finally falls into the turntable. Figure 3Furthermore, a spiral protrusion 741 is provided in the above-mentioned conical material distribution protrusion 740 for controlling the speed of material distribution, see Figure 4 . The surface of the above-mentioned conical material distribution protrusion 740 is a refractory material layer. An air distribution duct is arranged on the lower side of the above-mentioned conical material distribution protrusion, and an air distribution nozzle is arranged on the conical material distribution protrusion. The above-mentioned air distribution duct is connected to a blower (not shown in the figure) through a rotating joint, and blows cold air to the upper feed port of the conical material distribution protrusion by blowing. In this process, only the high-temperature slag surface at the moment of falling is cooled, thereby solving the problem of adhesion of slag during the falling process and ensuring that the slag is evenly and effectively distributed.

[0098] Furthermore, the lower edge of the fixed cover is fitted with the outer edge of the aggregate groove of the turntable, and a refractory material is arranged between the two to form a seal, such as thermal insulation rock wool. Through this structure, a detachable assembly connection is formed between the fixed cover and the aggregate groove to meet maintenance and needs. Or an inspection door is arranged somewhere on the fixed cover, which can be quickly opened and inspected by opening and closing. This structure facilitates rapid maintenance of the equipment.

[0099] About the innovation of the spiral heat exchange pipe in this spiral cone heat exchange cold feed machine: Style 1: spiral lofting is performed on the conical surface of the above-mentioned turntable from the feed end to the discharge end. The so-called lofting refers to drawing on the conical surface to form the fixed points of the spiral heat exchange pipe. The spiral lofting expansion diagram in this style is a single spiral. After the lofting is completed, the spiral heat exchange unit is made of metal wear-resistant pipes. The spiral heat exchange unit is designed for 360 degrees. Figure 8 and Fig. 9 A plurality of spiral heat exchange units 431 are formed by welding a plurality of heat exchange tubes 432 in parallel in the height direction and are in the shape of three-dimensional ribs. In order to enhance the fixing strength between the spiral heat exchange unit and the turntable diameter, a fixed rib is arranged on the back side between the turntable and the enhanced spiral heat exchange unit. The fixed rib supports the enhanced spiral heat exchange unit in the lower position in the gravity direction. The support can effectively improve the support for the slag particles and avoid deformation of the enhanced spiral heat exchange unit.

[0100] The high point of each enhanced spiral heat exchange unit is connected through a vertical first water supply branch 4211, and the first water supply branches of multiple enhanced spiral heat exchange units are connected for a second time and aggregated to the second water supply branch 4212. The second water supply branch is preferably arranged horizontally, and the horizontally arranged second water supply branch is connected to the third water supply branch 4213 through a tee, and the third water supply branch is connected to a rotary joint on the outside. Similarly, the low point of each enhanced spiral heat exchange unit is connected through a vertical first return water branch 4411, and the first return water branches of multiple enhanced spiral heat exchange units are connected for a second time and aggregated to the second return water branch 4412. The second return water branch is preferably arranged horizontally, and the horizontally arranged second return water branch is connected to the third return water branch 4413 through a tee, and the third return water branch is connected to a rotary joint on the outside.

[0101] Refractory bricks 402 are laid on the surface of the above-mentioned turntable, and a slag material propulsion channel is formed between the turntable and the spiral tubes on both sides. When the turntable rotates clockwise, the internal slag material slides downward under the driving force of the turntable due to its own weight.

[0102] Style 2, based on Style 1, makes the following additions, for reference Fig.10 , synchronously, a spiral auxiliary heat exchange tube 4321 is arranged in the turntable, and the auxiliary heat exchange tube 4321 is also a 360-degree spiral, which is arranged on the upper surface of the turntable, specifically, the auxiliary heat exchange tube is fixedly installed on the bottom plate of the spiral steel slag advancing channel, and is called a spiral heat exchange bottom for the convenience of distinguishing it from the spiral heat exchange unit. The auxiliary heat exchange tube 4321 is also arranged in parallel, and the water inlet and return ends of the auxiliary heat exchange tube are also connected to the first water inlet branch 4212 and the first water return branch 4412. In this way, the steel slag is directly in contact with the bottom and side of the spiral conveying channel, and the soft water medium in the heat exchange tube is exchanged with heat.

[0103] Style 3, the structure of this style is as follows: Reference Fig.11, heat exchange tubes are no longer arranged in the heat exchange walls on both sides of the spiral discharge channel 420, but traditional high temperature resistant solid alloy ribs 415 are used. That is to say, different from the second style, in this embodiment, alloy ribs 415 are formed on both sides of the spiral discharge channel 420. The spiral discharge channel 420 is formed by spiral ribs, such as welding on the ramp of the turntable 400. This channel is also the discharge channel for high temperature steel slag. On the turntable, a spiral heat exchange tube 432 is arranged in the spiral discharge channel 420. The heat exchange tube 432 is also a 360-degree spiral and is arranged on the upper surface of the turntable. Specifically, the heat exchange tube is fixedly installed on the bottom plate of the spiral discharge channel, which is called the spiral heat exchange bottom. The water inlet end and the water return end of the heat exchange tube 432 are also connected to the first water inlet branch pipe 4212 and the first water return branch pipe 4412. In this way, the steel slag directly contacts the bottom and side of the spiral conveying channel and exchanges heat with the soft water medium in the heat exchange tube. In this way, only the heat exchange tubes are arranged on the slope bottom plate of the turntable, and the dense arrangement can also play a role in heat exchange.

[0104] Style 4, based on style 3, refer to Fig.12 , the heat exchange tube 432 covers the side and bottom of the spiral discharge channel to increase the heat exchange area. In this way, the heat exchange area in wall style three is larger and the heat exchange effect is better.

[0105] The above four styles systematically reveal the combination styles of the heat exchange tube and the turntable, especially the four typical situations in which the heat exchange tube is used as a heat exchange wall and a heat exchange bottom. These four situations are all within the protection scope of the present invention.

[0106] Of course, the above-mentioned heat exchange walls and ribs are only arranged in a single spiral structure, and can also be arranged in a double spiral or even a triple spiral. Compared with the single spiral structure, this will only increase some implementation costs, all within the protection scope of the present invention.

[0107] Furthermore, the slag discharge temperature at the discharge end is detected, for example, a temperature sensor is set, and when the detected temperature is lower than 120°C, the constant speed of the turntable is maintained, and when the detected temperature is higher than 120°C, the speed of the turntable is reduced until the detected temperature is lower than 120°C. That is, by adding a temperature sensor and performing feedback automatic control with the drive motor, the terminal temperature of the steel slag can be controlled, and the thermal energy of the steel slag can be fully recovered and utilized.

[0108] The embodiments described above are merely illustrative of preferred embodiments of the present invention.

Claims

1. A full-process dry recycling and efficient heat recovery system for high-temperature steel slag, which includes a crusher and a spiral cone heat exchange cooler, and is characterized by: The crusher crushes the high-temperature steel slag to obtain the high-temperature steel slag with the particle size meeting the set requirements, and continuously supplies the high-temperature steel slag with the particle size meeting the requirements to the spiral cone heat exchange cooler; the spiral cone heat exchange cooler comprises a turntable, a fixed cover and a turntable drive assembly, wherein the conical turntable surface has a spiral discharge channel, the high point and the low point of the spiral discharge channel are respectively the feed end and the discharge end, and a heat exchange pipe is laid at the channel bottom or / side wall of the spiral discharge channel, the heat exchange pipe is arranged in sections to form a plurality of spiral heat exchange units independent of each other, the spiral heat exchange unit close to the feed end and located in the high temperature zone of the turntable is connected to the high temperature slag water cooling system, and in the high temperature The high-temperature steel slag is cooled from more than 1100°C to not more than 300°C in the zone, and the waste heat of the high-temperature slag water cooling system is recovered to obtain steam; the spiral heat exchange unit close to the discharge end and located in the low-temperature zone of the turntable is connected to the low-temperature slag water cooling system, and the medium- and high-temperature steel slag from the high-temperature zone is cooled to low-temperature steel slag below 120°C in this low-temperature zone and discharged, and the waste heat of the low-temperature slag water cooling system is recovered to obtain hot water; the fixed cover is fixedly installed above the turntable, and a conical space for cooling and exchanging high-temperature steel slag is formed between the fixed cover and the turntable; the turntable drive assembly is connected to the turntable and drives the turntable to rotate, and the high-temperature steel slag is pushed along the spiral discharge channel during the rotation.

2. The high-temperature steel slag full-process dry resource utilization and high-efficiency heat energy recovery system according to claim 1 is characterized in that: The spiral heat exchange unit is composed of a plurality of heat exchange tubes arranged in parallel in the height direction, and fixed ribs are arranged to enhance the fixing strength of the heat exchange tubes and the rotating disk.

3. The high-temperature steel slag full-process dry resource utilization and high-efficiency heat energy recovery system according to claim 1 or 2, characterized in that: The spiral heat exchange unit is composed of a plurality of heat exchange tubes laid at the bottom of the spiral discharge channel.

4. The high-temperature steel slag full-process dry resource utilization and high-efficiency heat energy recovery system according to claim 1 is characterized in that: Ribs are arranged on both sides of the spiral discharge channel, and the spiral heat exchange unit is composed of a plurality of heat exchange tubes laid on the channel bottom and / or the rib side walls of the spiral discharge channel.

5. The high-temperature steel slag full-process dry resource utilization and high-efficiency heat energy recovery system according to claim 1 is characterized in that: The outer side of the turntable is provided with a ring-shaped aggregate groove, and a drop opening is arranged on the aggregate groove. A scraper plate is arranged on the edge of the turntable, and the scraper plate is inserted into the aggregate groove. During the rotation of the turntable, the scraper plate is driven to slide in the aggregate groove. The steel slag moves along the aggregate groove and is discharged from the drop opening of the aggregate groove when reaching the drop opening.

6. The high-temperature steel slag full-process dry resource recovery and high-efficiency heat energy recovery system according to claim 1 is characterized in that: It also includes a slag buffer bin, which is located between the crusher and the spiral cone heat exchange cooler and is equipped with a blast system for supplying cold air into the slag buffer bin to temporarily store, buffer and quantitatively feed the high-temperature slag from the crusher.

7. The high-temperature steel slag full-process dry resource utilization and high-efficiency heat energy recovery system according to claim 1 is characterized in that: The crusher includes a power plate assembly, a power steel roller assembly, a slag aggregate assembly, and a crushing chamber assembly; the power plate assembly includes a driving motor, a bevel gear reduction and transmission mechanism, a plate and a scraper, wherein the scraper is fixed at the edge of the plate, the driving motor is horizontally arranged and connected to the transmission mechanism through a bevel gear reduction and drives the plate to rotate horizontally; the power steel roller assembly located above the plate includes a crushing roller, a bearing assembly, a hydraulic motor and a water medium rotary joint, wherein the crushing roller is mounted on a slider through a bearing assembly, the slider is mounted on an equipment frame through the linear sliding fit, a linear hydraulic lifting cylinder is arranged between the slider and the equipment frame, a water medium cooling channel is provided inside the crushing roller, a water medium rotary joint is installed at one end of the crushing roller, a hydraulic motor is installed at the other end of the crushing roller, and the water medium cooling channel is externally connected to a water cooling system; the outer shell of the crushing chamber assembly covers the space above the plate and the crushing roller and forms a space for crushing and crushing, and a slag feeding port and a hot air exhaust port are arranged at the top of the outer shell.

8. The high-temperature steel slag full-process dry resource utilization and high-efficiency heat energy recovery system according to claim 1 is characterized in that: An upwardly protruding conical material distribution protrusion is arranged at the center of the turntable, a spiral protrusion is arranged in the conical material distribution protrusion, an air distribution pipe is arranged on the lower side of the conical material distribution protrusion, and an air distribution nozzle is arranged on the conical material distribution protrusion, and the air distribution pipe is connected to an external blower.

9. A full-process dry process for recycling high-temperature steel slag and a highly efficient heat recovery process, characterized in that: The first step is to use a crusher to crush the high-temperature steel slag and obtain high-temperature steel slag with a particle size that meets the set requirements, and continuously supply the high-temperature steel slag with a particle size that meets the requirements to the spiral cone heat exchange cooler; In the second step, the crushed high-temperature steel slag is uniformly fed into the spiral cone heat exchange cold material machine. The high-temperature steel slag enters the conical space between the fixed cover and the turntable under the action of gravity and falls into the spiral discharge channel of the turntable. The spiral cone heat exchange cold material machine comprises a turntable, a fixed cover and a turntable drive assembly, wherein a spiral discharge channel is provided on the conical surface of the turntable, and the high point and the low point of the spiral discharge channel are respectively the feed end and the discharge end. When the turntable rotates, the high-temperature steel slag advances in the spiral discharge channel. During the advancement process, the high-temperature steel slag exchanges heat with the cold medium in the heat exchange tubes laid at the bottom and / or the side wall of the spiral discharge channel. The heat exchange tubes are arranged in sections and form multiple sections. This independent spiral heat exchange unit divides the area of ​​the turntable into a high-temperature zone and a low-temperature zone according to different positions, wherein the spiral heat exchange unit near the feed end and located in the high-temperature zone of the turntable is connected to a high-temperature slag water cooling system, in which the high-temperature steel slag is cooled from higher than 1100°C to no higher than 300°C, and at the same time, the cold medium in the high-temperature slag water cooling system is recovered through a flash tank to obtain high-temperature steam; the spiral heat exchange unit near the discharge end and located in the low-temperature zone of the turntable is connected to a low-temperature slag water cooling system, in which the medium-high temperature steel slag from the high-temperature zone is cooled to low-temperature steel slag below 120°C and discharged, and at the same time, the cold medium in the low-temperature slag water cooling system is recovered to obtain hot water; The turntable driving assembly is connected to the turntable and drives the turntable to rotate. The slag discharge speed of the low-temperature steel slag is controlled by controlling the rotation of the turntable. During the rotation, the high-temperature steel slag is pushed along the spiral discharge channel.

10. The high-temperature steel slag full-process dry resource utilization and high-efficiency heat energy recovery process according to claim 9, characterized in that: A temperature sensor is set at the discharge end to detect the temperature of the slag discharged from the discharge end. When the detected temperature is lower than the set temperature threshold, the speed of the turntable is maintained at a constant speed. When the detected temperature is higher than the set temperature threshold, the speed of the turntable is reduced until the detected temperature is lower than 120°C.

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