Full-automatic high-temperature slag dry-method efficient waste heat recovery equipment

Abstract

The invention discloses full-automatic high-temperature slag dry-method efficient waste heat recovery equipment. The inner wall of the equipment drum is a water pipe wall 2, and fin groups 1 are uniformly distributed on the water pipe wall 2; a water inlet and outlet header pipe 3 is arranged in the center of the rotary drum, and a feeding end sealing cover 14 and a discharging end sealing cover 15 are arranged at the two ends of the rotary drum respectively; a feed hopper 10 is arranged on the feed end sealing cover 14, and a discharge hopper 11 is arranged on the discharge end sealing cover 15; a feed hopper control valve 18 is arranged on the feed hopper 10, and a discharge hopper control valve 19 is arranged on the discharge hopper 11; the two ends of the water inlet and outlet header pipe 3 are connected with a steam outlet connecting pipe 12 and a water inlet connecting pipe 17 respectively, a steam outlet pipe coupler 13 is arranged on the steam outlet connecting pipe 12, and a water inlet pipe coupler 16 is arranged on the water inlet connecting pipe 17. The heat recovery efficiency is larger than or equal to 85%, the steam pressure fluctuation is smaller than or equal to + / -0.05 MPa, and the service life of equipment is 8-10.

Description

Technical Field

[0001] This invention belongs to the field of solid waste resource utilization and industrial energy-saving waste heat recovery technology in the metallurgical industry. Specifically, it relates to a fully automatic high-temperature slag dry high-efficiency waste heat recovery equipment for treating high-temperature molten slag (temperature >1200℃) generated in the steelmaking process of the metallurgical industry. Background Technology

[0002] High-temperature slag is a type of slag discharged during the smelting process in converters, electric furnaces, and refining furnaces. It is formed from impurities in the metal raw materials, fluxes, and furnace linings, and is mainly composed of silicates, ferrates, and oxides (GB / T51387—2019). It primarily includes converter slag, electric furnace slag, foundry residue, and open-hearth furnace slag. For every ton of crude steel produced, 100-150 kg of high-temperature slag is generated. In recent years, my country's annual production of high-temperature slag has remained at or exceeded 100 million tons. Coupled with its consistently low resource utilization rate, approximately 70 million tons of high-temperature slag are dumped annually. This not only occupies a large amount of land but also causes pollution to soil, air, and water bodies.

[0003] High-temperature slag contains abundant thermal energy, with a discharge temperature reaching 1400 to 1600℃. If it can be recycled, it will bring considerable energy-saving benefits. It is estimated that the sensible heat recoverable from each ton of steel slag is as high as 2 GJ, equivalent to the energy of 41 kg of standard coal. If steel mills nationwide could effectively recover and utilize this sensible heat, the annual savings in standard coal would reach over 4.9 million tons. Furthermore, by recovering the thermal energy from steel slag and converting it into electricity, energy-saving benefits can be further increased. Based on a 60% recovery rate, the annual energy-saving benefits would be approximately 12.7 billion yuan, demonstrating the enormous potential for the resource utilization of steel slag.

[0004] However, current steel slag treatment processes and resource utilization methods mainly focus on the recovery of steel slag materials, such as slag steel, magnetic separation powder, and tailings extraction. There is insufficient attention paid to the efficient conversion and utilization of waste heat and energy from high-temperature metallurgical slag, particularly the breakthrough in high-temperature steel slag waste heat recovery technology and equipment, which has become an urgent problem to be solved.

[0005] To address this issue, some domestic and foreign enterprises and research institutes have developed various wet waste heat recovery technologies, such as the drum method, air quenching method, hot simmering method, and fluidized bed method. These technologies involve adding a small amount of water while treating steel slag to recover heat from some of the generated water vapor and high-temperature air.

[0006] Because the heat undergoes multiple conversions through high-temperature slag-air / polluted water-clean water, the heat loss is significant. In actual operation, there are problems such as low heat recovery efficiency, severe equipment wear, high investment, high energy consumption, and secondary pollution to varying degrees, making it impossible to achieve effective heat recovery from steel slag.

[0007] To improve the waste heat recovery efficiency of high-temperature slag, a new dry-process waste heat recovery technology for high-temperature slag without water injection has emerged on the market. The principle is that after the high-temperature slag is crushed, it is fed into a horizontal cylindrical waste heat recovery device by a feeder. The high-temperature slag moves with the rotation of the device, and the heat-exchanged slag is discharged from the other end of the device. The characteristic of this process is that it allows the high-temperature slag to directly contact the heat exchange water pipes in a solid-solid manner, allowing the heat from the slag to be directly transferred to clean water through the pipes, forming clean high-temperature steam.

[0008] Compared to the previous wet process, this process can directly transfer the heat of the high-temperature slag to clean water, avoiding multiple heat transfer losses and effectively improving heat exchange efficiency.

[0009] However, the following technical defects still exist: ① Traditional equipment mostly uses heat exchange in a single temperature range, without realizing high and low temperature cascade recovery, resulting in low waste heat utilization efficiency (≤70%). ② The fin structure is mostly flat or simply curved, which is easily worn by high-temperature slag impact and is prone to slag formation, resulting in a gradual decline in heat exchange efficiency. ③ The inlet and outlet water pipes are mostly single-layer or double-layer structures, resulting in large heat loss. The pipes are also susceptible to high-temperature corrosion and slag impact, leading to a short service life. ④ The control system is mostly semi-automatic or single-parameter control, with large fluctuations in steam pressure and temperature, making it impossible to achieve stable output. Summary of the Invention

[0010] This invention addresses the various problems existing in the waste heat recovery device, the core equipment in the above-mentioned high-temperature slag dry treatment process, and provides a fully automatic high-efficiency waste heat recovery device for high-temperature slag dry treatment.

[0011] The technical solution of this invention is: a fully automatic high-temperature slag dry process high-efficiency waste heat recovery device, wherein the device is a rotary drum structure, the inner wall of the rotary drum is a water pipe wall, and fin groups 1 are evenly distributed on the water pipe wall; an inlet and outlet water main pipe is set at the center of the rotary drum, a chain drive box is connected to the outer wall of the rotary drum, and a motor is connected to the chain drive box; a feed end sealing cover and a discharge end sealing cover are respectively set at both ends of the rotary drum; a feed hopper is set on the feed end sealing cover, and a discharge hopper is set on the discharge end sealing cover; the feed end sealing cover is equipped with a feed hopper; the feed end sealing cover is equipped with a discharge ... A feed hopper control valve is installed on the hopper, and a discharge hopper control valve is installed on the discharge hopper; the two ends of the main inlet and outlet water pipes are respectively connected to a steam outlet connection pipe and a water inlet connection pipe, a steam outlet pipe coupling is installed on the steam outlet connection pipe, and a water inlet pipe coupling is installed on the water inlet connection pipe; the main inlet and outlet water pipes have a concentric circular structure in different areas, with the water inlet at the high-temperature slag outlet end of the equipment, which is the low-temperature section of the equipment, and the water outlet at the high-temperature slag inlet end of the equipment, which is the high-temperature section of the equipment, and the water flow direction is opposite to the slag movement direction.

[0012] According to an embodiment of the present invention, the main inlet and outlet water pipe adopts a three-layer concentric circle design in the high-temperature section, with an inner low-temperature water inlet pipe, an air insulation layer in the middle, and an outer high-temperature steam pipe on the outside.

[0013] According to an embodiment of the present invention, the inlet and outlet water mains adopt a double-layer concentric circle design in the low-temperature section, with an inner low-temperature water inlet pipe and an outer low-temperature water outlet high-temperature pipe. The connection between the low-temperature water outlet high-temperature pipe and the plant heating network adopts a temperature adaptive valve.

[0014] According to an embodiment of the present invention, an arc-shaped guide plate is provided on the outer wall of the inlet and outlet water main, the bending direction of the arc-shaped guide plate is the same as the rotation direction of the equipment, and the spacing is not greater than the bending angle.

[0015] According to an embodiment of the present invention, the bending angle of the arc-shaped guide plate is 30°-60°, the spacing is 200-300mm, and the ratio of the height of the arc-shaped guide plate to the height of the corresponding fin group is 1:1.2 in the high-temperature section and 1:1.5 in the low-temperature section; an arc-shaped groove is machined on the surface of the arc-shaped guide plate, the groove being 50-80mm wide and 20-30mm deep.

[0016] According to an embodiment of the present invention, the connection between the inlet and outlet water mains in the high-temperature section and the low-temperature section adopts a flexible sealing + heat insulation sleeve structure; the flexible sealing adopts a metal corrugated compensator, and the heat insulation sleeve adopts aluminum silicate fiber felt, which is fitted on the outside of the connection.

[0017] According to an embodiment of the present invention, the high-temperature section shell is lined with Al2O3-SiC-C refractory castable, and the outer layer of the high-temperature section of the inlet and outlet water main is made of 316L stainless steel and is equipped with a polytetrafluoroethylene anti-corrosion lining.

[0018] According to an embodiment of the present invention, the fin assembly adopts a multi-layer irregular double-sided curved cross section; when the rotating drum rotates clockwise, there are 2 to 4 layers of curved fins on the side facing the high-temperature slag, and 1 to 3 layers of curved fins on the side facing away from the high-temperature slag, and the side facing away from the high-temperature slag always has one less layer of curved fins than the side facing away.

[0019] According to an embodiment of the present invention, the fin group adopts a cylindrical involute spiral stepped arrangement, and the axial and radial spacing of adjacent fin groups gradually increases along the inlet and outlet directions, with the smallest spacing at the high-temperature inlet end and the largest spacing at the low-temperature outlet end.

[0020] According to an embodiment of the present invention, the motor, feed hopper, discharge hopper, feed hopper control valve, discharge hopper control valve, and water inlet connection pipe are respectively connected to a multi-parameter coupled fully automatic steam pressure adaptive control system.

[0021] High-temperature slag enters the high-efficiency waste heat recovery equipment at a certain speed through the feed hopper and under the action of the feed hopper control valve. The equipment body rotates at a certain speed driven by the motor and chain drive box. During this process, the high-temperature slag will tumble inside the equipment and come into direct contact with the fin assembly, water pipe wall, and inlet and outlet water main, transferring heat to the hot water in the water pipe wall and turning it into steam. After heat exchange, the high-temperature slag is discharged from the equipment at a certain speed through the discharge hopper and discharge hopper control valve.

[0022] Hot water enters through the inlet connection pipe, undergoes heat exchange through the pipe wall and the main inlet and outlet pipes, and the resulting steam is discharged from the steam outlet connection pipe via the steam outlet pipe coupling. Its features include a high- and low-temperature stepped waste heat recovery system within the equipment body, high-efficiency impact-resistant finned assemblies on the inner wall of the equipment, concentric inlet and outlet main pipes in the center of the equipment, and a matching multi-parameter coupled fully automatic steam pressure adaptive control system. It features high heat recovery efficiency (≥85%), strong operational stability (steam pressure fluctuation ≤±0.05MPa), low equipment failure rate, long service life (8-10 years), high steam quality, and wide adaptability.

[0023] The high and low temperature stepped waste heat recovery system of the equipment body divides the equipment into a high temperature section (≥300℃, actual metallurgical slag temperature can reach 800-1200℃) and a low temperature section (temperature less than 300℃), which can recover waste heat generated by slag at different temperatures. After recovering heat in the low temperature section, low-grade steam or hot water is generated, which can be used to preheat the low-temperature demineralized water in the inlet pipe 4, or it can be sent to the plant's heating system; after recovering heat in the high temperature section, high-grade steam is generated, which can be transported externally through the steam outlet connection pipe 12 for power generation or sale.

[0024] This invention provides a fully automatic high-temperature slag dry process high-efficiency waste heat recovery device, characterized by: Feature 1: High and low temperature stepped waste heat recovery system of the equipment body; Feature 2: High-efficiency impact-resistant fin assembly on the inner wall of the equipment; Feature 3: Concentric inlet and outlet water mains in the center of the equipment; Feature 4: A matching multi-parameter coupled fully automatic steam pressure adaptive control system.

[0025] The combination of these four characteristics enables the equipment to have high heat recovery efficiency, strong operational stability, low equipment failure rate, long service life, high steam quality, high degree of automation, and stable steam generation.

[0026] The high and low temperature stepped waste heat recovery system of the equipment body described in feature 1 divides the equipment into a high-temperature section (≥300℃, actual metallurgical slag temperature can reach 800-1200℃) and a low-temperature section (temperature less than 300℃), which can recover waste heat generated by slag at different temperatures. After recovering heat in the low-temperature section, low-grade steam or hot water is generated, which can be used to preheat the low-temperature demineralized water in the inlet pipe 4, or it can be sent to the plant's heating system; after recovering heat in the high-temperature section, high-grade steam is generated, which can be transported externally through the steam outlet connection pipe 12 for power generation or sale.

[0027] The high and low temperature stepped waste heat recovery system of the equipment body described in feature 1 is characterized by the high temperature section shell being lined with Al2O3-SiC-C refractory castable, the outer layer of the high temperature section of the inlet and outlet water main pipe 3 being made of 316L stainless steel and having an additional polytetrafluoroethylene anti-corrosion lining; and the connection between the high temperature section and the low temperature section main pipe adopting a flexible sealing structure of metal corrugated compensator and aluminum silicate fiber felt heat insulation sleeve.

[0028] Feature 2, the high-efficiency anti-impact fin assembly, employs a multi-layered, irregularly shaped, double-sided curved cross-section. When the equipment rotates clockwise, the side facing the high-temperature slag has 2-4 layers of curved fins, while the side facing away from the slag has 1-3 layers. The side facing away always has one less layer of curved fins than the side facing forward. This fin assembly effectively extends the contact time between the high-temperature slag and the heat exchanger pipes and fins, expands the solid-solid heat conduction area, reduces the solid-gas heat radiation area, and thus increases the heat recovery efficiency of the high-temperature slag.

[0029] Feature 2 features a multi-layered, irregularly shaped, double-sided curved section high-efficiency impact-resistant fin assembly. This assembly employs a cylindrical, involute, spiral, stepped arrangement. The axial and radial spacing between adjacent fin assemblies gradually increases along the equipment inlet and outlet directions, with the smallest spacing at the high-temperature inlet and the largest at the low-temperature outlet. This arrangement allows the high-temperature slag at the inlet high-temperature section to move axially at a slower speed during equipment rotation, increasing its residence time and improving the quality of the heat exchange steam. Its faster radial speed accelerates the slag's tumbling, increasing the contact frequency between the slag and the heat exchange water pipes and fins, thus improving the stability of the generated steam. The low-temperature slag at the outlet low-temperature section moves axially and radially at faster speeds, accelerating its discharge and reducing equipment size, while also fully utilizing its residual heat.

[0030] The high-efficiency anti-impact fin assembly with multi-layer irregular double-sided curved cross-section of feature 2 has 2-4 layers of curved fins facing the high-temperature slag, with the bending radius decreasing sequentially (first layer bending radius R1=150-200mm, second layer R2=100-150mm, third layer R3=50-100mm, fourth layer R4=30-50mm), forming a "stepped buffer structure" to gradually weaken the impact force of the high-temperature slag; the bending radius of the 1-3 layers of curved fins facing away from the high-temperature slag differs from the number of layers facing the front by 50-80mm, ensuring that the slag forms a continuous "flip-stop-convey" motion trajectory during the rotation of the equipment, avoiding local slag accumulation. Meanwhile, in the cylindrical involute spiral stepped arrangement of the fin group, the axial spacing of adjacent fins at the high-temperature inlet end is 100-150mm and the radial spacing is 80-120mm, while the axial spacing at the low-temperature outlet end is 200-300mm and the radial spacing is 150-200mm. The gradual change rate of the spacing matches the slag temperature decay rate (decay of 50-80℃ per meter), achieving a dynamic balance between heat exchange efficiency and conveying efficiency.

[0031] The high-efficiency impact-resistant fin assembly with multi-layer irregular double-sided curved cross-section described in feature 2 has a height that gradually increases as the temperature decreases. The fin assembly located at the high-temperature inlet end has the lowest height, approximately 200mm~300mm, while the fin assembly located at the low-temperature outlet end has the highest height, approximately 400mm~500mm. The specific height needs to be determined based on the characteristics of the actual high-temperature slag. This design can fully utilize the waste heat of the high-temperature slag at each stage, taking into account the movement and temperature distribution characteristics of the high-temperature slag inside the equipment. This ensures uniform heating of the hot water exchange pipes in both the high-temperature and low-temperature sections, guaranteeing that the demineralized water can be heated evenly and stably, thereby improving the stability of the generated steam pressure.

[0032] The high-efficiency anti-impact fin assembly with multi-layer irregular double-sided curved cross section of feature 2 has a WC-CoCr metal ceramic coating and micro-nano texture structure composite design on its surface. The coating thickness is 0.3-0.5mm, the surface micron-level concave-convex texture height difference is 50-100μm, and the spacing is 200-300μm. The fin bending angle is adapted to the equipment speed to achieve the function of slag self-detachment.

[0033] The equipment center of feature 3 features a concentric circular inlet and outlet water main, which adopts a three-layer concentric circle design in the high-temperature section. The innermost layer is the low-temperature inlet water pipe, the middle layer is the air insulation layer, and the outermost layer is the high-temperature outlet water pipe. The inlet is located at the high-temperature slag outlet end of the equipment, and the outlet is located at the high-temperature slag inlet end of the equipment. The water flow direction is opposite to the slag movement direction. This design can effectively reduce the impact of the low-temperature water flow in the main pipe on the heat of the high-temperature water, thus reducing heat loss. On the other hand, before the high-temperature water flows out of the equipment, it can be further heated by the heat radiation of the high-temperature slag and the heat conduction from direct contact with a small amount of high-temperature slag, thereby further heating the high-temperature steam and high-temperature water mixture flowing in the pipe and improving the grade and temperature of the generated steam.

[0034] The equipment's central concentric inlet and outlet water mains, as described in feature 3, employ a double-layer concentric circle design in the low-temperature section. The inner layer is the low-temperature inlet pipe 4, and the outer layer is the high-temperature outlet pipe. Compared to the high-temperature section's inlet and outlet mains, the insulation layer in the middle of the mains is eliminated. The low-temperature inlet pipe inside the low-temperature section is connected to the innermost low-temperature inlet pipe of the high-temperature section, while the high-temperature outlet pipe outside the low-temperature section is isolated from the outermost high-temperature outlet pipe of the high-temperature section. The inlet is located at the low-temperature slag outlet end of the equipment, and the outlet is located at the high-temperature slag inlet end. This design allows for a gradual heating process in the hot water exchanger pipes, achieving step-by-step heat recovery. Furthermore, the hot water generated in the low-temperature section can preheat the cold water in the inlet pipe or be supplied to the plant's hot water network.

[0035] Feature 3 describes a device with a concentric ring of inlet and outlet water mains at its center. The outermost ring of this ring features an arc-shaped guide plate, whose bending direction is the same as the device's rotation direction. The spacing and bending angle are determined based on the actual particle size of the high-temperature slag. This design effectively prevents the direct impact of high-temperature slag falling from the upper fin assembly on the water pipe wall during rotation, thus slowing down the pipe's wear rate and extending the service life of the inlet and outlet water mains. Furthermore, the arc-shaped guide plate allows some of the high-temperature slag falling from the upper fin assembly to accumulate on its rising surface, ensuring sufficient contact with the water pipe and further increasing the temperature of the high-temperature steam in the outlet water main, while also providing some insulation.

[0036] The equipment center of feature 3 has a concentric circular inlet and outlet water main pipe with different zones. The curved guide plate has a bending angle of 30°-60° and a spacing of 200-300mm. Its setting height is adapted to the height of the fin group in the corresponding zone (the ratio of guide plate height to fin height is 1:1.2 at the high temperature end and 1:1.5 at the low temperature end). This ensures that the slag falling from the fin group can accurately land on the rising surface of the guide plate, forming a cycle of "slag accumulation - full heat exchange - directional sliding". The surface of the guide plate is processed with an arc-shaped groove (groove width 50-80mm, depth 20-30mm), which can guide the slag to slide along the groove, avoiding heat loss and equipment wear caused by slag splashing. At the same time, the slag in the groove can form a "heat storage layer" to improve the heat exchange effect of the pipeline.

[0037] The equipment center of feature 3 features a concentric circle of inlet and outlet water mains in different zones. The connection between the high-temperature section inlet and outlet water mains 3 and the low-temperature section inlet and outlet water mains adopts a "flexible seal + heat insulation sleeve" structure: the flexible seal uses a metal corrugated compensator (made of Inconel 625) to absorb the thermal deformation of the pipeline caused by temperature difference and prevent pipeline cracking; the heat insulation sleeve uses aluminum silicate fiber felt (thickness 50-80mm) and is fitted on the outside of the connection to prevent heat flow between the high and low temperature sections and ensure the stability of the preheating efficiency of the low-temperature section water inlet and the steam quality of the high-temperature section. At the same time, the connection between the low-temperature section outlet high-temperature pipe and the plant heating network adopts a "temperature adaptive valve", which can automatically adjust the hot water output according to the network demand to achieve flexible adaptation for waste heat utilization.

[0038] The multi-parameter coupled fully automatic steam pressure adaptive control system described in Feature 4 can achieve lower-level control of the system through a PLC or DCS control system, coupled with hardware such as encoders, controllers, digital / analog input / output modules, and communication modules. Upper-level control of the system can be achieved by setting up an intelligent control system, video monitoring system, operating console, and monitor in a ground control room or operator's room. Through this configuration, based on the automatic detection of the steam pressure and temperature, and the slag temperature in the feed and discharge hoppers, the system uses a special algorithm to process the collected detection data and automatically adjusts the speed of motor 8, the opening degree of the feed and discharge hopper control valves, and the water flow rate in the inlet connection pipe. This creates mutual compensation among multiple control devices, thereby improving the quality and stability of the generated steam. Simultaneously, it monitors the real-time operating status of all equipment, achieving fully automated operation throughout the entire process.

[0039] The multi-parameter coupled fully automatic steam pressure adaptive control system of feature 4 is characterized in that: the multi-parameter coupled fully automatic steam pressure adaptive control system of the equipment adopts a "multi-parameter coupled adaptive PID algorithm", which is different from the traditional single-parameter control algorithm. This algorithm simultaneously collects six core parameters: steam pressure (set value 0.8-1.2MPa), steam temperature (set value 180-250℃), feed slag temperature (800-1200℃), discharge slag temperature (≤150℃), water flow rate (5-10m³ / h), and equipment speed (5-15r / min). The parameters are normalized by fuzzy control theory to establish a coupled control model of "speed-feed rate-water flow rate", so as to achieve a steam pressure fluctuation range ≤±0.05MPa (the fluctuation range of traditional equipment is ±0.1-0.2MPa), which greatly improves the steam stability.

[0040] The multi-parameter coupled fully automatic steam pressure adaptive control system of the equipment, as described in feature 4, is equipped with a "fault warning and self-repair function". It can monitor the equipment's operating status in real time through vibration sensors (detecting equipment vibration amplitude ≤0.1mm / s) and temperature sensors (detecting pipe wall temperature deviation ≤±10℃). When faults such as fin slagging (vibration amplitude >0.15mm / s) or pipe leakage (temperature drop >20℃ / min) are detected, an early warning signal is automatically triggered and a self-repair program is started (such as increasing the equipment speed to achieve slagging self-detachment, closing valves in the fault area and switching to a backup pipeline).

[0041] The multi-parameter coupled fully automatic steam pressure adaptive control system of the equipment is equipped with an "energy optimization distribution function". It can automatically switch the steam use (power generation or heating) according to the power / heat demand of the plant (receiving pipeline signals through the communication module) to maximize the waste heat utilization efficiency (overall heat recovery efficiency ≥85%, traditional equipment heat recovery efficiency ≤70%).

[0042] The beneficial effects of this invention are as follows: First, by using high and low temperature stepped recovery, the overall heat recovery efficiency is increased to over 85%, achieving efficient utilization of energy in stages. Secondly, by relying on the optimized fin structure and multi-parameter adaptive control system, the stable output of steam grade is ensured; Third, it adopts a high-temperature resistant, wear-resistant and corrosion-resistant design, which extends the service life of the equipment to 8-10 years and significantly reduces operation and maintenance costs. Fourth, it achieves fully automated operation and has fault warning and self-repair functions; Fifth, it is compatible with various high-temperature slag types and particle sizes, taking into account multiple application scenarios and green environmental protection needs, which can create significant economic, environmental and social benefits and has broad promotion value.

[0043] This invention solves all the defects of the above-mentioned existing technologies through the synergistic innovation of a high and low temperature stepped waste heat recovery system, a composite structure anti-impact and anti-slagging fin assembly, a regional concentric circular main pipe design, and a multi-parameter coupled adaptive control system. It achieves a technological breakthrough with a heat recovery efficiency of ≥85%, steam pressure fluctuation of ≤±0.05MPa, and equipment service life of 8-10 years. Compared with the existing technologies, it has significant creativity and practicality and can be widely applied in the fields of metallurgical solid waste resource utilization and industrial energy conservation. Attached Figure Description

[0044] Figure 1 This is a structural diagram of a fully automatic high-temperature slag dry process high-efficiency waste heat recovery equipment.

[0045] Figure 2 This is a 3D internal diagram of a fully automated high-temperature slag dry process high-efficiency waste heat recovery device.

[0046] Figure 3 This is a longitudinal cross-sectional view of the interior of a fully automatic high-temperature slag dry process high-efficiency waste heat recovery device.

[0047] Figure 4 It is a cross-sectional view of the concentric inlet and outlet water mains located in the center of the equipment.

[0048] Figure 5 It is a diagram of a single multi-layered, irregularly shaped, double-sided curved section high-efficiency impact-resistant fin located on the inner wall of the equipment.

[0049] Figure 6 It is a diagram showing the internal water flow direction of the concentric inlet and outlet water mains located in the center of the equipment in the high-temperature and low-temperature sections.

[0050] In the diagram: 1-finned assembly, 2-water pipe wall, 3-inlet and outlet main water pipe, 4-inner low-temperature water inlet pipe, 5-intermediate heat insulation pipe, 6-outer high-temperature steam pipe, 7-arc guide plate, 8-motor, 9-chain drive box, 10-feed hopper, 11-discharge hopper, 12-steam outlet connecting pipe, 13-steam outlet pipe coupling, 14-feed end sealing cover, 15-discharge end sealing cover, 16-water inlet pipe coupling, 17-water inlet connecting pipe, 18-feed hopper control valve, 19-discharge hopper control valve, 20-low-temperature section outlet high-temperature water pipe. Detailed Implementation

[0051] To better understand the above-described device, the device will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present invention and the specific features in the embodiments are detailed descriptions of the device of this application, rather than limitations on the device of this application. Unless otherwise specified, the embodiments of this application and the technical features in the embodiments can be combined with each other.

[0052] This invention provides a fully automatic high-temperature slag dry process high-efficiency waste heat recovery device. The device is a rotary drum structure. The inner wall of the rotary drum is a water pipe wall 2, and fin groups 1 are evenly distributed on the water pipe wall 2. A main water inlet and outlet pipe 3 is set at the center of the rotary drum. A chain drive box 9 is connected to the outer wall of the rotary drum, and a motor 8 is connected to the chain drive box 9. A feed end sealing cover 14 and a discharge end sealing cover 15 are respectively set at both ends of the rotary drum. A feed hopper 10 is set on the feed end sealing cover 14, and a discharge hopper 11 is set on the discharge end sealing cover 15. A feed hopper control valve 18 is provided, and a discharge hopper control valve 19 is provided on the discharge hopper 11. The two ends of the inlet and outlet water main pipe 3 are respectively connected to the steam outlet connecting pipe 12 and the water inlet connecting pipe 17. A steam outlet pipe coupling 13 is provided on the steam outlet connecting pipe 12, and a water inlet pipe coupling 16 is provided on the water inlet connecting pipe 17. The inlet and outlet water main pipe 3 has a regional concentric circle structure. The water inlet is at the high-temperature slag outlet end of the equipment, which is the low-temperature section of the equipment, and the water outlet is at the high-temperature slag inlet end of the equipment, which is the high-temperature section of the equipment. The water flow direction is opposite to the slag movement direction.

[0053] The main inlet and outlet water pipe 3 adopts a three-layer concentric circle design in the high-temperature section, with an inner low-temperature water inlet pipe 4, an air insulation layer 5 in the middle, and an outer high-temperature steam pipe 6 on the outside.

[0054] The main inlet and outlet water pipe 3 adopts a double-layer concentric circle design in the low-temperature section. The inner layer is the low-temperature inlet water pipe 4, and the outer layer is the low-temperature outlet high-temperature pipe 20. The connection between the low-temperature outlet high-temperature pipe 20 and the plant heating network adopts a temperature adaptive valve.

[0055] The outer wall of the main inlet and outlet water pipe 3 is provided with an arc-shaped guide plate 7. The bending direction of the arc-shaped guide plate 7 is the same as the rotation direction of the equipment, and the spacing is not greater than the bending angle.

[0056] The curvature of the arc-shaped guide plate 7 is 30°-60° and the spacing is 200-300mm. The ratio of the height of the arc-shaped guide plate 7 to the height of the corresponding fin group 1 is 1:1.2 in the high-temperature section and 1:1.5 in the low-temperature section. The surface of the arc-shaped guide plate 7 is machined with an arc-shaped groove, the groove width is 50-80mm and the depth is 20-30mm.

[0057] The connection between the inlet and outlet main pipe 3 and the high-temperature section adopts a flexible sealing + heat insulation sleeve structure; the flexible sealing adopts a metal corrugated compensator, and the heat insulation sleeve adopts aluminum silicate fiber felt, which is fitted on the outside of the connection.

[0058] The high-temperature section shell is lined with Al2O3-SiC-C refractory castable, and the outer layer of the high-temperature section of the main water inlet and outlet pipe 3 is made of 316L stainless steel and is equipped with a polytetrafluoroethylene anti-corrosion lining.

[0059] The fin assembly 1 adopts a multi-layer irregular double-sided curved section; when the rotating drum rotates clockwise, there are 2 to 4 layers of curved fins on the side facing the high-temperature slag, and 1 to 3 layers of curved fins on the side facing away from the high-temperature slag. The side facing away from the high-temperature slag always has one less layer of curved fins than the side facing towards the slag.

[0060] The fin group 1 is arranged in a cylindrical involute spiral step shape. The axial and radial spacing of adjacent fin groups 1 gradually increases along the inlet and outlet directions, with the smallest spacing at the high-temperature inlet end and the largest spacing at the low-temperature outlet end.

[0061] The motor 8, feed hopper 10, discharge hopper 11, feed hopper control valve 18, discharge hopper control valve 19, and water inlet connection pipe 17 are respectively connected to a multi-parameter coupled fully automatic steam pressure adaptive control system.

[0062] High-temperature slag enters the high-efficiency waste heat recovery equipment at a certain speed through the feed hopper 10 under the action of the feed hopper control valve 18. The equipment body rotates at a certain speed driven by the motor 8 and the chain drive box 9. During this process, the high-temperature slag will tumble inside the equipment and come into direct contact with the fin assembly 1, the water pipe wall 2, and the inlet and outlet water main pipe 3, transferring heat to the hot water in the water pipe wall 2, turning it into steam. After heat exchange, the high-temperature slag is discharged from the equipment at a certain speed through the discharge hopper 11 and the discharge hopper control valve 19. The hot water enters from the inlet water connection pipe 17, and after heat exchange through the water pipe wall 2 and the inlet and outlet water main pipe 3, the generated steam is discharged from the steam outlet connection pipe 12 through the steam outlet pipe coupling 13. Its features include a high and low temperature stepped waste heat recovery system for the equipment body, a high-efficiency anti-impact fin assembly 1 on the inner wall of the equipment, a regional concentric water inlet and outlet main pipe 3 in the center of the equipment, and a matching multi-parameter coupled fully automatic steam pressure adaptive control system. It has the characteristics of high heat recovery efficiency (≥85%), strong operational stability (steam pressure fluctuation ≤±0.05MPa), low equipment failure rate, long service life (8-10 years), high steam quality, and wide adaptability.

[0063] The high and low temperature stepped waste heat recovery system of the equipment body divides the equipment into a high temperature section (≥300℃, actual metallurgical slag temperature can reach 800-1200℃) and a low temperature section (temperature less than 300℃), which can recover waste heat generated by slag at different temperatures. After recovering heat in the low temperature section, low-grade steam or hot water is generated, which can be used to preheat the low-temperature demineralized water in the inlet pipe 4, or it can be sent to the plant's heating system; after recovering heat in the high temperature section, high-grade steam is generated, which can be transported externally through the steam outlet connection pipe 12 for power generation or sale.

[0064] The high-temperature section shell of the equipment is lined with Al2O3-SiC-C refractory castable. The outer layer of the high-temperature section of the main inlet and outlet water pipe is made of 316L stainless steel and is equipped with a polytetrafluoroethylene anti-corrosion lining. The connection between the high-temperature section and the low-temperature section main pipe adopts a flexible sealing structure of metal corrugated compensator and aluminum silicate fiber felt heat insulation sleeve.

[0065] The high-efficiency anti-impact fin assembly 1 adopts a multi-layered, irregularly shaped, double-sided curved cross-section. When the equipment rotates clockwise, the side facing the high-temperature slag has 2-4 layers of curved fins, and the side facing away from the high-temperature slag has 1-3 layers of curved fins. The side facing away from the high-temperature slag always has one less layer of curved fins than the side facing away. This fin assembly 1 can effectively extend the contact time between the high-temperature slag and the heat exchanger pipe and fins, expand the solid-solid heat conduction area, reduce the solid-gas heat radiation area, and thus increase the heat recovery efficiency of the high-temperature slag.

[0066] The high-efficiency anti-impact fin assembly 1 adopts a cylindrical involute spiral stepped arrangement. The axial and radial spacing of adjacent fin assemblies gradually increases along the inlet and outlet directions of the equipment, with the smallest spacing at the high-temperature end of the inlet and the largest spacing at the low-temperature end of the outlet. With this arrangement, when the equipment rotates, the high-temperature slag located in the high-temperature inlet section has a slower axial movement speed, thus increasing its residence time in the high-temperature section and improving the quality of the heat exchange steam. Its faster radial movement speed accelerates the slag's tumbling speed, thereby increasing the contact frequency between the high-temperature slag and the heat exchange water pipes and fins, and improving the stability of the heat exchange steam. The low-temperature slag located in the low-temperature outlet section has a faster axial and radial movement speed, which on the one hand accelerates the discharge speed of the low-temperature slag, reducing equipment size, and on the other hand, fully utilizes the waste heat of the low-temperature slag.

[0067] The high-efficiency anti-impact fin assembly 1 features a multi-layered, irregularly shaped, double-sided curved section. The 2-4 layers of curved fins facing the high-temperature slag have progressively decreasing bending radii (first layer bending radius R1=150-200mm, second layer R2=100-150mm, third layer R3=50-100mm, fourth layer R4=30-50mm), forming a "stepped buffer structure" that gradually weakens the impact of the high-temperature slag. The 1-3 layers of curved fins facing away from the high-temperature slag have bending radii that differ from the corresponding number of layers facing the slag by 50-80mm, ensuring that the slag forms a continuous "flip-stop-convey" motion trajectory during equipment rotation, avoiding localized slag accumulation. Meanwhile, in the cylindrical involute spiral stepped arrangement of the fin group, the axial spacing of adjacent fins at the high-temperature inlet end is 100-150mm and the radial spacing is 80-120mm, while the axial spacing at the low-temperature outlet end is 200-300mm and the radial spacing is 150-200mm. The gradual change rate of the spacing matches the slag temperature decay rate (decay of 50-80℃ per meter), achieving a dynamic balance between heat exchange efficiency and conveying efficiency.

[0068] The height of the high-efficiency anti-impact fin assembly 1 gradually increases as the temperature decreases. The fin assembly located at the high-temperature inlet end has the lowest height, approximately 200mm~300mm, while the fin assembly located at the low-temperature outlet end has the highest height, approximately 400mm~500mm. The specific height needs to be determined based on the characteristics of the actual high-temperature slag. This design fully utilizes the residual heat of the high-temperature slag at each stage, taking into account the movement and temperature distribution characteristics of the slag within the equipment. This ensures uniform heating of the hot water exchange pipes 2 in both the high-temperature and low-temperature sections, guaranteeing a uniform and stable temperature rise of the demineralized water, thereby improving the stability of the generated steam pressure.

[0069] The surface of the high-efficiency anti-impact fin assembly 1 adopts a composite design of WC-CoCr metal ceramic coating and micro-nano texture structure. The coating thickness is 0.3-0.5mm, the surface micron-level concave-convex texture height difference is 50-100μm, the spacing is 200-300μm, and the fin bending angle is adapted to the equipment speed to achieve the function of slag self-detachment.

[0070] The central concentric water inlet and outlet main pipe 3 of the equipment adopts a three-layer concentric circle design in the high-temperature section. The innermost layer is the low-temperature water inlet pipe 4, the middle layer is the air insulation layer 5, and the outermost layer is the high-temperature water outlet pipe 6. The water inlet 17 is located at the high-temperature slag outlet end of the equipment, and the water outlet 12 is located at the high-temperature slag inlet end of the equipment. The water flow direction is opposite to the slag movement direction. This design can effectively reduce the impact of the low-temperature water flow in the main pipe on the heat of the high-temperature water, reducing heat loss. On the other hand, before flowing out of the equipment, the outermost high-temperature water can be further heated by the heat radiation of the high-temperature slag and the heat conduction from direct contact with a small amount of high-temperature slag, further heating the high-temperature steam and high-temperature water mixture flowing in the pipe, thereby improving the quality and temperature of the generated steam.

[0071] The central concentric water inlet and outlet main pipe 3 of the equipment adopts a double-layer concentric circle design in the low-temperature section. The inner layer is the low-temperature inlet pipe 4, and the outer layer is the high-temperature outlet pipe 20. Compared with the high-temperature section water inlet and outlet main pipe, the insulation layer 5 in the middle of the main pipe is eliminated. The low-temperature inlet pipe 4 located inside the low-temperature section is connected to the innermost low-temperature inlet pipe 4 of the high-temperature section, while the high-temperature outlet pipe 20 located outside the low-temperature section is isolated from the outermost high-temperature outlet pipe 6 of the high-temperature section. The inlet 17 is located at the low-temperature slag outlet end of the equipment, and the outlet 12 is located at the high-temperature slag inlet end of the equipment. This design allows the demineralized water in the hot water exchange pipe to gradually heat up, achieving step-by-step heat recovery. On the other hand, the hot water generated in the low-temperature section can preheat the cold water in the inlet pipe or be sent to the plant's hot water network.

[0072] The centrally located concentric water inlet and outlet main pipe 3 of the equipment has an outermost arc-shaped guide plate 7. The bending direction of the guide plate is the same as the rotation direction of the equipment, and the spacing and bending angle are determined according to the actual particle size of the high-temperature slag. This design effectively prevents the high-temperature slag falling from the upper fin assembly 1 from directly impacting the water pipe wall 2 during equipment rotation, thereby slowing down the wear rate of the pipe and extending the service life of the water inlet and outlet main pipe 3. On the other hand, it allows some of the high-temperature slag falling from the upper fin assembly 1 to accumulate on the rising surface of the arc-shaped guide plate 7, allowing it to fully contact the water pipe 2, thereby further increasing the temperature of the high-temperature steam in the water outlet main pipe 3, and also playing a certain role in heat preservation.

[0073] The curved guide plate 7 has a bending angle of 30°-60° and a spacing of 200-300mm. Its height is adapted to the height of the corresponding fin assembly (the ratio of guide plate height to fin height is 1:1.2 at the high-temperature end and 1:1.5 at the low-temperature end), ensuring that the slag falling from the fin assembly can accurately land on the rising surface of the guide plate, forming a cycle of "slag accumulation - full heat exchange - directional sliding". The surface of the guide plate is processed with arc-shaped grooves (groove width 50-80mm, depth 20-30mm), which can guide the slag to slide along the grooves, avoiding heat loss and equipment wear caused by slag splashing. At the same time, the slag in the grooves can form a "heat storage layer" to improve the heat exchange effect of the pipeline.

[0074] The connection between the high-temperature section inlet / outlet main pipe 3 and the low-temperature section inlet / outlet main pipe adopts a "flexible seal + heat insulation sleeve" structure: the flexible seal uses a metal corrugated compensator (made of Inconel 625), which can absorb the thermal deformation of the pipe caused by temperature difference and prevent pipe cracking; the heat insulation sleeve uses aluminum silicate fiber felt (thickness 50-80mm), which is fitted on the outside of the connection to prevent heat flow between the high and low temperature sections and ensure the stability of the low-temperature section inlet water preheating efficiency and the high-temperature section steam quality. At the same time, the connection between the low-temperature section outlet high-temperature pipe 20 and the plant heating network adopts a "temperature adaptive valve", which can automatically adjust the hot water output according to the network demand to achieve flexible adaptation for waste heat utilization.

[0075] The multi-parameter coupled fully automatic steam pressure adaptive control system of the equipment can achieve lower-level control through a PLC or DCS control system, along with hardware such as controllers, digital / analog input / output modules, and communication modules; and upper-level control through an operator's console and monitoring computer set up in a ground control room or operator's room. With this configuration, based on the automatic detection of the steam pressure and temperature, and the slag temperature in the feed hopper 10 and discharge hopper 11, the system uses a special algorithm to process the collected detection data and automatically adjust the speed of motor 8, the opening degree of the feed hopper control valve 18 and the discharge hopper control valve 19, and the water flow rate in the inlet water connection pipe 17. This creates mutual compensation among multiple control devices, thereby improving the quality and stability of the generated steam. Simultaneously, it monitors the real-time operating status of all equipment, achieving fully automated operation throughout the entire process.

[0076] The multi-parameter coupled fully automatic steam pressure adaptive control system of the equipment adopts a "multi-parameter coupled adaptive PID algorithm". Unlike the traditional single-parameter control algorithm, this algorithm simultaneously collects six core parameters: steam pressure, steam temperature, feed slag temperature, discharge slag temperature, water inlet flow rate, and equipment speed. The parameters are normalized through fuzzy control theory to establish a coupled control model of "speed-feed rate-water inlet flow rate", which can achieve a steam pressure fluctuation range of ≤±0.05MPa, greatly improving steam stability.

[0077] The equipment's multi-parameter coupled fully automatic steam pressure adaptive control system has been enhanced with a "fault warning and self-repair function". It can monitor the equipment's operating status in real time through vibration and temperature sensors. When faults such as fin slagging or pipeline leakage are detected, an early warning signal is automatically triggered and a self-repair program is started.

[0078] The equipment's multi-parameter coupled fully automatic steam pressure adaptive control system is equipped with an "energy optimization distribution function," which can automatically switch the steam use (power generation or heating) according to the plant's electricity / heat demand (receiving pipeline signals through a communication module), thereby maximizing waste heat utilization efficiency (overall heat recovery efficiency ≥85%, while traditional equipment heat recovery efficiency ≤70%).

[0079] 18. The multi-parameter coupled fully automatic steam pressure adaptive control system according to any one of claims 1, 14-17, characterized in that: the specific technical solution of the control system includes four parts: hardware architecture, software algorithm module, control logic link, and redundancy protection design, as follows: (1) Hardware architecture: The three-level distributed architecture of "upper computer-lower computer-field sensor / actuator" is adopted. The upper computer adopts an industrial-grade touch screen all-in-one machine with built-in monitoring software and data processing platform to realize parameter display, threshold setting, alarm recording, data traceability and remote control functions. The lower computer adopts a high-performance PLC controller, equipped with analog input module, digital input module, analog output module, digital output module and communication module to realize field data acquisition and actuator command issuance. Field sensors include: steam pressure sensor, steam temperature sensor, feed slag temperature sensor, discharge slag temperature sensor, water inlet flow sensor, equipment speed encoder, vibration sensor, pipeline wall temperature sensor. The sensors that need to be interlocked at important points are redundantly configured. The actuators include frequency converter, feed hopper electric regulating valve 18, discharge hopper electric regulating valve 19, water inlet flow electric regulating valve, temperature adaptive valve and backup pipeline switching solenoid valve. All actuators support manual / automatic switching mode. (2) Software Algorithm Module: Integrates four core modules: multi-parameter coupled adaptive PID algorithm module, fault diagnosis and self-repair algorithm module, energy optimization allocation algorithm module, and data acquisition and preprocessing module; among which, the data acquisition and preprocessing module adopts the moving average filtering algorithm to remove random noise in sensor data, and at the same time identifies and replaces abnormal data; in the multi-parameter coupled adaptive PID algorithm module, the PID parameters can be dynamically adjusted according to the parameter coupling degree. The coupling degree is calculated by the Pearson correlation coefficient. When the coupling degree is ≥0.7, the derivative time D is automatically increased and the integral time I is decreased to avoid mutual interference between parameters; the fault diagnosis and self-repair algorithm module... The fault detection module employs a diagnostic approach combining threshold judgment and trend analysis. By setting normal threshold ranges and rate of change thresholds for each parameter, and combining the trend (rising / falling / stable) of three consecutive sampling data, it achieves accurate identification of fault types. The self-repair program has a built-in library of multiple fault response strategies, which can automatically match the optimal repair solution according to the fault type. The energy optimization allocation algorithm module establishes a decision model for switching the use of steam based on the power / heat demand signals of the plant area. When the power demand is greater than or equal to the heat demand, high-grade steam is given priority to the power generation system and low-grade steam is given to the heating system. Conversely, the steam allocation ratio is adjusted to ensure maximum waste heat utilization efficiency. (3) Control Logic Link: Closed-loop feedback control logic is adopted, specifically divided into three levels of control links; Level 1 control (basic control): Field sensors collect 6 core parameters and equipment operating status parameters in real time, which are preprocessed and transmitted to the lower-level PLC. The PLC calculates control commands through the multi-parameter coupled adaptive PID algorithm module and sends them to each actuator to realize real-time adjustment of motor speed, feed rate, and water flow rate, ensuring that the steam pressure is stable within the set value ±0.05MPa; Level 2 control (optimization control): The upper-level computer receives the operating data transmitted by the lower-level computer in real time and analyzes the plant demand signals through the energy optimization allocation algorithm module. A steam usage switching command is sent to the PLC. The PLC adjusts the temperature adaptive valve opening and steam delivery path according to the command, and feeds back the adjustment results to the host computer. Three-level control (protection control): Real-time monitoring of key safety parameters such as equipment vibration amplitude, pipeline wall temperature, and steam pressure. When any parameter exceeds the safety threshold, a first-level alarm (audible and visual alarm) is immediately triggered. At the same time, the emergency protection program is activated, the motor speed is reduced to the minimum value, the feed hopper control valve is closed, the pipeline connection in the fault area is cut off, and the system is switched to the backup pipeline. If the parameters continue to be abnormal, a second-level alarm is triggered and the machine is automatically shut down. At the same time, the time of the fault, the fault type, and related parameter data are recorded. (4) Redundancy protection design: At the hardware level, the host computer and the slave computer are connected by dual communication links with redundancy. When any link fails, it will automatically switch to the other link. The sensors that need to be interlocked at important points are configured with redundancy. At the software level, the program backup and breakpoint resume function are adopted. The host computer software supports timed backup. When the software crashes abnormally, it can quickly restore to the most recent backup state and retain the running data before the crash. The slave computer program supports breakpoint resume. After restarting, it can restore to the control state before the crash without re-initialization. At the power supply level, it is equipped with a UPS uninterruptible power supply to ensure that the system can record fault data normally and execute emergency shutdown procedures in the event of a sudden power outage, so as to avoid equipment damage and safety hazards.

[0080] The control system is also equipped with remote monitoring and maintenance functions. Through 4G / 5G communication modules or industrial Ethernet, it supports real-time viewing of equipment operating parameters, alarm information, and steam distribution status on mobile terminals (phones, tablets) or remote monitoring centers, in addition to the host computer. At the same time, it can remotely issue parameter adjustment commands to realize remote operation and maintenance and fault diagnosis of the equipment, reducing on-site operation and maintenance costs. In addition, the system has a built-in data traceability function, which can store at least one year of operating data and supports data query and export by time, parameter type, and fault type, providing data support for equipment operation optimization, fault analysis, and performance evaluation.

Claims

1. A fully automatic high-temperature slag dry process high-efficiency waste heat recovery device, wherein the device is a rotary drum structure, characterized in that... The inner wall of the rotating drum is a water pipe wall (2), and fin groups (1) are evenly distributed on the water pipe wall (2); an inlet and outlet water main pipe (3) is set at the center of the rotating drum, and a chain drive box (9) is connected to the outer wall of the rotating drum, and a motor (8) is connected to the chain drive box (9); a feed end sealing cover (14) and a discharge end sealing cover (15) are respectively set at both ends of the rotating drum; a feed hopper (10) is set on the feed end sealing cover (14), and a discharge hopper (11) is set on the discharge end sealing cover (15); a feed hopper control valve (18) is set on the feed hopper (10), and so on. The discharge hopper (11) is equipped with a discharge hopper control valve (19); the two ends of the water inlet and outlet main pipe (3) are respectively connected to the steam outlet connecting pipe (12) and the water inlet connecting pipe (17). The steam outlet connecting pipe (12) is equipped with a steam outlet pipe coupling (13), and the water inlet connecting pipe (17) is equipped with a water inlet pipe coupling (16); the water inlet and outlet main pipe (3) has a regional concentric circle structure. The water inlet is at the high temperature slag outlet end of the equipment, which is the low temperature section of the equipment, and the water outlet is at the high temperature slag inlet end of the equipment, which is the high temperature section of the equipment. The water flow direction is opposite to the slag movement direction.

2. The fully automatic high-temperature slag dry process high-efficiency waste heat recovery equipment according to claim 1, characterized in that: The main inlet and outlet water pipe (3) adopts a three-layer concentric circle design in the high temperature section, with an inner low temperature water inlet pipe (4), an air insulation layer (5) in the middle, and an outer high temperature steam pipe (6) on the outside.

3. The fully automatic high-temperature slag dry process high-efficiency waste heat recovery equipment according to claim 1, characterized in that: The main inlet and outlet water pipe (3) adopts a double-layer concentric circle design in the low-temperature section. The inner layer is the low-temperature inlet water pipe (4), and the outer layer is the low-temperature outlet high-temperature pipe (20). The connection between the low-temperature outlet high-temperature pipe (20) and the plant heating network adopts a temperature adaptive valve.

4. The fully automatic high-temperature slag dry process high-efficiency waste heat recovery equipment according to claim 1, characterized in that: The outer wall of the main inlet and outlet water pipe (3) is provided with an arc-shaped guide plate (7). The arc-shaped guide plate (7) bends in the same direction as the rotation direction of the equipment, and the spacing is not greater than the bending angle.

5. The fully automatic high-temperature slag dry process high-efficiency waste heat recovery equipment according to claim 4, characterized in that: The bending angle of the arc-shaped guide plate (7) is 30°-60° and the spacing is 200-300mm. The ratio of the height of the arc-shaped guide plate (7) to the height of the corresponding fin group (1) is 1:1.2 in the high temperature section and 1:1.5 in the low temperature section. The surface of the arc-shaped guide plate (7) is machined with an arc-shaped groove, the groove width is 50-80mm and the depth is 20-30mm.

6. The fully automatic high-temperature slag dry process high-efficiency waste heat recovery equipment according to claim 1, characterized in that: The inlet and outlet main pipe (3) adopts a flexible sealing + heat insulation sleeve structure at the connection between the high temperature section and the low temperature section; the flexible sealing adopts a metal corrugated compensator, and the heat insulation sleeve adopts aluminum silicate fiber felt, which is fitted on the outside of the connection.

7. The fully automatic high-temperature slag dry process high-efficiency waste heat recovery equipment according to claim 1, characterized in that: The high-temperature section shell is lined with Al2O3-SiC-C refractory castable, and the inlet and outlet water main (3) the outer layer of the high-temperature section pipe is made of 316L stainless steel and is equipped with a polytetrafluoroethylene anti-corrosion lining.

8. The fully automatic high-temperature slag dry process high-efficiency waste heat recovery equipment according to claim 1, characterized in that: The fin assembly (1) adopts a multi-layer irregular double-sided curved section; when the rotating drum rotates clockwise, there are 2 to 4 layers of curved fins on the side facing the high-temperature slag, and 1 to 3 layers of curved fins on the side facing away from the high-temperature slag. The side facing away from the high-temperature slag always has one less layer of curved fins than the side facing towards the slag.

9. The fully automatic high-temperature slag dry process high-efficiency waste heat recovery equipment according to claim 1, characterized in that: The fin group (1) is arranged in a cylindrical involute spiral step shape. The axial and radial spacing of adjacent fin groups (1) gradually increases along the inlet and outlet directions. The spacing is smallest at the high temperature end of the inlet and largest at the low temperature end of the outlet.

10. The fully automatic high-temperature slag dry process high-efficiency waste heat recovery equipment according to claim 1, characterized in that: The motor (8), feed hopper (10), discharge hopper (11), feed hopper control valve (18), discharge hopper control valve (19), and water inlet connection pipe (17) are respectively connected to a multi-parameter coupled fully automatic steam pressure adaptive control system.

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