Metallurgical waste slag air quenching granulation bead forming waste heat recovery method and system

Abstract

The invention relates to the field of metallurgical industry, and discloses a metallurgical waste slag air-quenching granulation bead-forming waste heat recovery method and system, and the system comprises a waste slag air-quenching granulation module which is used for cooling and granulating high-temperature metallurgical waste slag in a molten state through high-speed airflow; the spray cooling module is arranged above or at the periphery of the waste residue air quenching granulation module; the condensation module is connected with the spray cooling module; the waste heat recovery module is used for extracting waste heat generated in the waste residue granulation process and the cooling medium condensation process from the waste residue air quenching granulation module and the condensation module through a heat exchange device; the circulating water module is used for collecting the cooling medium recovered in the spray cooling module and the condensation module and circularly conveying the cooling medium to the spray cooling module; and a waste gas treatment module. Through the air quenching granulation and waste heat recovery module, high-temperature waste residues are rapidly cooled into solid particles through high-speed airflow, and after heat released by cooling the waste residues is recovered through a heat exchanger, a remarkable energy-saving effect is achieved.

Description

Technical Field

[0001] The invention relates to the field of metallurgical industry, and in particular to a method and system for recovering waste heat from wind quenching and granulation of metallurgical waste slag into beads. Background Art

[0002] In the production process of the metallurgical industry, a large amount of high-temperature waste slag is generated. These waste slags contain a large amount of heat energy. The traditional treatment method is usually to treat the high-temperature waste slag through natural cooling or water quenching, which not only wastes the residual heat resources contained in the waste slag, but also causes a series of environmental problems. In particular, the water quenching cooling process will produce a large amount of wastewater, and the consumption of water resources is huge. At the same time, the wastewater generated after the cooling water comes into contact with the high-temperature waste slag contains a large amount of heavy metals and other harmful substances. Improper treatment will cause pollution to the environment. In addition, although the natural cooling method reduces the consumption of water resources, the cooling speed is slow, the waste slag occupies a large amount of yard, increases the operating costs of the enterprise, and fails to effectively recover the heat energy in the waste slag.

[0003] High-temperature waste slag contains a large amount of thermal energy, but existing treatment technologies, such as natural cooling and water quenching cooling, cannot effectively recover this thermal energy. Although natural cooling does not require additional resource investment, the entire cooling process is slow, and the heat energy is dissipated into the air and cannot be reused. During the water quenching cooling process, the high temperature of the waste slag is quickly taken away by the cooling water, but the heat energy in the wastewater is not recovered, resulting in a large amount of energy waste. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a method and system for recovering waste heat from air quenching and granulation of metallurgical waste slag into beads, which solves the problem that natural cooling and water quenching cooling cannot effectively recover a large amount of heat energy contained in high-temperature waste slag.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: A method and system for recovering waste heat from metallurgical waste slag quenching and granulation into beads, comprising:

[0006] The slag air quenching granulation module is used to cool and granulate the molten high-temperature metallurgical slag through high-speed airflow to form granular or beaded solids;

[0007] A spray cooling module is arranged above or around the waste slag air quenching granulation module, and the spray cooling module absorbs heat in the waste slag and exhaust gas by spraying cooling medium to generate cooling medium steam;

[0008] A condensation module, connected to the spray cooling module, for condensing the cooling medium vapor into a liquid cooling medium;

[0009] The waste heat recovery module extracts the waste heat generated during the waste slag granulation process and the cooling medium condensation process from the waste slag air quenching granulation module and the condensation module through a heat exchange device, and provides it to the modules that need thermal energy;

[0010] A circulating water module, used for collecting the cooling medium recovered from the spray cooling module and the condensing module and recycling it to the spray cooling module;

[0011] The waste gas treatment module is connected to the waste slag air quenching granulation module and the spray cooling module, and is used for purifying harmful substances in the waste gas.

[0012] Preferably, the waste slag air quenching granulation module includes a granulation device, which rapidly cools and granulates the molten waste slag through a high-pressure airflow. The high-pressure airflow is provided by a high-pressure fan of the granulation device, and the airflow is evenly distributed on the surface of the waste slag through a nozzle of a specific shape, so that the cooling rate is constant to generate granular or beaded waste slag of uniform size.

[0013] Preferably, the spray cooling module includes a plurality of spray devices, each of which is provided with an automatic regulating valve, which can automatically adjust the spraying amount of the cooling medium according to the temperature of the waste slag and the air flow velocity, and cover the granulation area through a plurality of cooling nozzles to ensure sufficient contact between the waste slag and the high-temperature gas.

[0014] Preferably, the condensation module comprises a condensation device, which comprises a plurality of condensation pipes and a metal condensation plate, and condenses the cooling medium vapor into a liquid state through cooling water circulation.

[0015] Preferably, the waste heat recovery module includes a heat exchanger, which is made of a heat-conducting material and can transfer waste heat generated during the condensation process and the waste slag granulation process. The waste heat is transferred to other modules through the heat transfer medium water or steam for process heating or space heating.

[0016] Preferably, the circulating water module includes a water storage tank, a circulating pump and a filtering device, the water storage tank is used to store the cooling medium recovered by the condensing module, the circulating pump is used to re-transport the recovered cooling medium to the spray cooling module, and the filtering device is used to remove impurities in the cooling medium.

[0017] Preferably, the exhaust gas treatment module comprises a multi-stage exhaust gas purification system, which comprises a dust collector, a gas filter and a desulfurization and denitration device, wherein the dust collector is used to capture particulate matter in the exhaust gas, the gas filter is used to remove harmful chemicals in the gas, and the desulfurization and denitration device is used to treat sulfur oxides and nitrogen oxides in the exhaust gas;

[0018] The heat exchanger in the waste heat recovery module is connected to the heating system of the building or factory, and is used to transfer the recovered waste heat to the heating system through a heat transfer medium, thereby realizing secondary utilization of the waste heat.

[0019] Preferably, a method for recovering waste heat from air quenching and granulation of metallurgical waste slag into beads comprises the following steps:

[0020] S1. Waste slag melting treatment:

[0021] The high-temperature metallurgical slag is discharged from the smelting furnace and transported to the slag wind quenching granulation device, where the slag is in a molten state and the temperature is between 1200°C and 1600°C;

[0022] Air quenching granulation:

[0023] The slag wind quenching granulation module uses high-speed airflow to quickly cool the molten metallurgical slag and break it into granular or beaded solids. This process uses the airflow provided by the high-pressure fan to quickly cool the slag surface to generate small granular slag;

[0024] S2, spray cooling:

[0025] During the granulation process, a spray cooling module is used to perform secondary cooling on high-temperature waste slag and waste gas. By adjusting the water volume of the spray device and spraying cooling water according to the waste slag temperature and air flow velocity, the temperature of the granulated waste slag is further reduced. At the same time, the high-temperature waste gas generated during the granulation process is captured, its heat is absorbed, and cooling water vapor is generated;

[0026] S3, water vapor condensation:

[0027] The water vapor generated during the spray cooling process is condensed by the condensation module. The water vapor is cooled into liquid water after passing through the condensation pipe and the condensation plate. The condensed water is introduced into the circulating water system for subsequent recycling. The waste heat released during the condensation process is transferred to the waste heat recovery module through the metal plate of the condensation device.

[0028] S4, waste heat recovery:

[0029] Recovering heat from the air quenching granulation and condensation process by a waste heat recovery module, the waste heat recovery module including a heat exchange device for transferring heat extracted from the granulation and condensation process to process hot water, process preheating equipment or a heating system;

[0030] S5. Circulating water utilization:

[0031] The liquid water generated after condensation returns to the spray cooling module through the circulating water module. The circulating water system ensures the continuous supply of cooling water through the water storage tank and the circulating pump, and purifies the recycled water through the filtering device to remove impurities;

[0032] S6. Waste gas treatment:

[0033] The waste gas generated during the granulation and cooling process is treated by the waste gas treatment module. The waste gas first passes through the dust removal device to remove particulate matter, and then passes through the gas purification equipment to remove harmful substances.

[0034] The present invention provides a method and system for recovering waste heat from metallurgical waste slag quenching and granulation into beads. It has the following beneficial effects:

[0035] 1. The present invention uses a wind quenching granulation and waste heat recovery module to quickly cool the high-temperature waste slag into solid particles using high-speed airflow. At the same time, the heat energy generated in the granulation process is recovered by a waste heat recovery device. The heat released by the cooled waste slag is recovered through a heat exchanger and can be used for process heating or heating systems, which greatly improves the energy utilization efficiency, reduces the consumption of external heat sources, and has a significant energy-saving effect.

[0036] 2. The present invention adopts a process combining air quenching granulation and spray cooling, which avoids the generation of a large amount of wastewater in the traditional water quenching cooling process, significantly reduces the consumption of water resources and water pollution problems. In addition, through the waste gas treatment module, the harmful gases and dust generated in the cooling and granulation process are effectively removed to ensure that the discharged waste gas meets environmental protection standards, thereby greatly reducing the impact of the waste residue treatment process on the environment.

[0037] 3. The spray cooling module and circulating water module in the present invention are reasonably designed. The high-temperature waste residue and waste gas are cooled by the spray system. The water vapor generated after the evaporation of the cooling water is condensed into liquid water through the condensation module and reused through the circulating water system. The entire cooling process realizes the closed-loop recycling of water, effectively reducing the consumption of water resources, and is particularly suitable for areas with scarce water resources.

[0038] 4. The present invention adopts an efficient wind quenching granulation module, which uses high-speed airflow to quickly cool and granulate the molten waste slag. Combined with the process design of spray cooling and waste heat recovery, it significantly improves the cooling speed of the waste slag and shortens the processing time, thereby improving the working efficiency of the entire system and being able to quickly process a large amount of waste slag. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a schematic diagram of a waste heat recovery system for metallurgical waste slag wind quenching granulation into beads according to the present invention;

[0040] Figure 2 The present invention is a flow chart of a method for recovering waste heat from wind quenching and granulation of metallurgical waste slag into beads. DETAILED DESCRIPTION

[0041] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] Please refer to the attached Figure 1 -Attached Figure 2 The embodiment of the present invention provides a waste heat recovery system for metallurgical waste slag wind quenching granulation into beads, comprising:

[0043] The slag air quenching granulation module is used to cool and granulate the molten high-temperature metallurgical slag through high-speed airflow to form granular or beaded solids;

[0044] Specifically, the core function of the slag air quenching granulation module is to quickly cool and granulate high-temperature metallurgical slag through high-pressure airflow. The main function of the high-pressure airflow is to ensure that the slag is quickly cooled from a molten state to a solid state to form uniform granular or beaded particles. Through this process, large solid blocks can be avoided during the cooling of the slag, ensuring the smooth progress of the subsequent processing process.

[0045] The spray cooling module is arranged above or around the waste slag air quenching granulation module. The spray cooling module absorbs the heat in the waste slag and exhaust gas by spraying cooling medium to generate cooling medium steam;

[0046] Specifically, the function of the spray cooling module is to perform secondary cooling on the waste slag and waste gas during the granulation process. Through the spraying of the cooling medium, the cooling medium is fully in contact with the high-temperature waste slag and gas, absorbing the heat therein, and the cooling medium is heated and evaporated to generate cooling medium steam. This process not only further reduces the temperature of the waste slag, but also effectively captures the heat energy in the waste gas and slows down the heat energy loss.

[0047] A condensation module, connected to the spray cooling module, for condensing the cooling medium vapor into a liquid cooling medium;

[0048] Specifically, the function of the condensation module is to condense the cooling medium vapor generated in the spray cooling module and convert it into liquid cooling medium. The module condenses the vapor into liquid through the condensation device in the cooling water circulation system for reuse. In this way, the cooling water can be recycled, reducing the waste of water resources and ensuring the continuous and stable operation of the system.

[0049] The waste heat recovery module extracts the waste heat generated during the waste slag granulation process and the cooling medium condensation process from the waste slag air quenching granulation module and the condensation module through a heat exchange device, and provides it to the modules that need thermal energy;

[0050] Specifically, the waste heat recovery module is responsible for recovering waste heat from the waste slag granulation and condensation process. Through the efficient heat exchange device, the heat released during the waste slag cooling and condensation process is extracted and transferred to other modules or equipment. The heat energy recovered from waste heat can be used for process heating or space heating, thereby achieving efficient use of energy within the system and reducing the demand for external heat sources.

[0051] A circulating water module, used for collecting the cooling medium recovered from the spray cooling module and the condensation module and recycling it to the spray cooling module;

[0052] Specifically, the main function of the circulating water module is to recover and purify the cooling medium in the spray cooling module and the condensing module, and then transport the cooling medium back to the spray cooling module for continued use. The circulation pump of this module ensures that the cooling medium can be effectively transported to each spray device, and the filter device can remove impurities in the water to ensure the cleanliness of the cooling medium and the stability of recycling.

[0053] The waste gas treatment module is connected to the waste slag air quenching granulation module and the spray cooling module to purify harmful substances in the waste gas.

[0054] Specifically, the exhaust gas treatment module is used to treat the exhaust gas generated during the slag granulation and cooling process, remove harmful substances in the exhaust gas, and ensure that the emission meets environmental requirements. The module uses a multi-stage exhaust gas purification system, including a dust collector, a gas filter, and a desulfurization and denitrification device to purify particulate matter, chemical pollutants, sulfur oxides, and nitrogen oxides in the exhaust gas step by step to meet the emission standards.

[0055] The waste slag air quenching granulation module includes a granulation device, which rapidly cools and granulates the molten waste slag through a high-pressure airflow. The high-pressure airflow is provided by a high-pressure fan of the granulation device, and the airflow is evenly distributed on the surface of the waste slag through a nozzle of a specific shape, so that the cooling rate is constant to generate granular or beaded waste slag of uniform size.

[0056] Specifically, the high-pressure airflow of the granulation device is provided by a high-pressure fan, and the shape of the nozzle design can ensure that the airflow evenly covers the surface of the waste residue, avoiding local overcooling or overheating during the cooling process, thereby ensuring that the waste residue cools at a uniform rate and ultimately generates solid particles of uniform size. By precisely controlling the cooling rate and granulation conditions, the size and shape of granular or beaded particles can be optimized for subsequent processing and recycling.

[0057] The spray cooling module includes multiple spray devices, which are equipped with automatic regulating valves. The spraying amount of the cooling medium can be automatically adjusted according to the temperature of the waste slag and the air flow velocity, and the granulation area is covered by multiple cooling nozzles to ensure sufficient contact between the waste slag and the high-temperature gas.

[0058] Specifically, the spray device in the spray cooling module has an automatic adjustment function, which can accurately adjust the spray amount of the cooling medium according to the real-time monitoring of the waste slag temperature and air flow speed. The design of multiple cooling nozzles ensures full coverage of the spray area, so that the waste slag and gas can be evenly cooled. The module further improves the cooling efficiency by intelligently controlling the opening and closing of the valve and the spraying speed.

[0059] The condensation module comprises a condensation device, which comprises a plurality of condensation pipes and a metal condensation plate, and condenses the cooling medium vapor into a liquid state through the circulation of cooling water.

[0060] Specifically, the condensation device in the condensation module consists of a condensation pipe and a condensation plate, which condenses the cooling medium vapor into liquid through the circulation of cooling water. The metal condensation plate has good thermal conductivity, which can effectively accelerate the condensation process, allowing the water vapor to quickly condense into water droplets, and then flow back to the water storage tank through the pipe, facilitating the reuse of the cooling medium.

[0061] The waste heat recovery module includes a heat exchanger, which is made of heat-conducting material and can transfer the waste heat generated during the condensation process and the waste slag granulation process. The waste heat is transferred to other modules through the heat transfer medium water or steam for process heating or space heating.

[0062] Specifically, the heat exchanger of the waste heat recovery module transfers the waste heat from the condensation and granulation process through high-efficiency heat-conducting materials. The heat is absorbed by the heat transfer medium (water or steam) and transferred to other modules or systems that require heat energy for process heating or heating. This module effectively recovers the heat energy generated during the waste slag treatment process and reduces additional energy consumption.

[0063] The circulating water module includes a water storage tank, a circulating pump and a filtering device. The water storage tank is used to store the cooling medium recovered by the condensing module, the circulating pump is used to re-transport the recovered cooling medium to the spray cooling module, and the filtering device is used to remove impurities in the cooling medium.

[0064] Specifically, the circulating water module stores the cooling medium recovered by the condensing module in a water storage tank, and the circulating pump transports the cooling medium to the spray cooling module again to achieve a closed-loop circulation. The filter device can remove impurities in the cooling medium to ensure the cleanliness of the cooling water, avoid the impact of scale and particulate matter on the equipment, and improve the overall operating efficiency of the system.

[0065] The exhaust gas treatment module includes a multi-stage exhaust gas purification system, which includes a dust collector, a gas filter and a desulfurization and denitrification device. The dust collector is used to capture particulate matter in the exhaust gas, the gas filter is used to remove harmful chemicals in the gas, and the desulfurization and denitrification device is used to treat sulfur oxides and nitrogen oxides in the exhaust gas;

[0066] Specifically, the multi-stage exhaust gas purification system removes particulate matter from the exhaust gas through a dust collector to ensure that the dust content in the exhaust gas is lower than the standard emission limit. The gas filter further removes harmful chemicals in the gas. The desulfurization and denitrification device processes sulfur oxides and nitrogen oxides to ensure that the pollutant concentration in the exhaust gas meets environmental protection requirements and reduces the impact of exhaust gas on the environment.

[0067] The heat exchanger in the waste heat recovery module is connected to the heating system of the building or factory, and is used to transfer the recovered waste heat to the heating system through a heat transfer medium, thereby realizing the secondary utilization of the waste heat.

[0068] Specifically, the heat exchanger in the waste heat recovery module is connected to the heating system of the building or factory, and the recovered waste heat is transferred to the heating system through heat transfer media such as water or steam to provide thermal energy for space heating. In this way, the waste heat in the system can be effectively reused, further improving the efficiency of energy use and reducing external energy consumption.

[0069] A method for recovering waste heat from metallurgical waste slag granulation into beads by air quenching, comprising the following steps:

[0070] S1. Waste slag melting treatment:

[0071] The high-temperature metallurgical slag is discharged from the smelting furnace and transported to the slag wind quenching granulation device. The slag is in a molten state and the temperature is usually maintained between 1200℃ and 1600℃. At this time, the slag has extremely high thermal energy and is in a molten state with good fluidity, which is suitable for granulation. The molten slag flows into the granulation device through the conveying system, and the molten slag is quickly cooled into a solid state under the subsequent high-speed airflow.

[0072] Air quenching granulation:

[0073] The slag wind quenching granulation module is used to quickly cool the molten metallurgical slag. The slag is broken into granular or beaded solids by high-speed airflow. The high-speed airflow provided by the high-pressure fan is evenly distributed on the surface of the slag, causing it to quickly cool to a solid state. During the granulation process, the airflow not only cools the molten slag, but also breaks the slag into fine particles through rapid mechanical impact. This step ensures the uniformity of the slag particles while maximizing the granulation efficiency to generate small granular slag suitable for subsequent treatment.

[0074] S2, spray cooling:

[0075] After granulation is completed, the high-temperature waste slag and waste gas are secondary cooled by the spray cooling module. The module automatically adjusts the amount of cooling water sprayed through an intelligent spray device to adapt to the temperature of the waste slag and the speed of the airflow during different granulation processes. Through multi-stage nozzles, the cooling water covers the surface of the waste slag and waste gas, fully contacts them, and further reduces the temperature of the granulated waste slag. At the same time, the cooling water absorbs the heat in the high-temperature waste gas, evaporates into water vapor, and forms a large amount of cooling medium steam. Spray cooling not only significantly reduces the temperature of the waste slag, but also plays a role in capturing the waste gas generated during the granulation process, ensuring the efficiency of subsequent waste gas treatment.

[0076] S3, water vapor condensation:

[0077] The water vapor generated during the spray cooling process is condensed through the condensation module. The water vapor enters the condensation device through the condensation pipe. The condensation plate is closely integrated with the cooling water circulation system. The water vapor is quickly condensed into liquid water by utilizing the efficient thermal conductivity of the metal plate. The condensed water enters the circulating water module through the drainage system for subsequent circulation. During the condensation process, the condensation plate and the condensation pipe surface not only cool the water vapor, but also release the condensation waste heat. This waste heat is conducted through the metal plate and enters the waste heat recovery module, further optimizing the waste heat utilization efficiency.

[0078] S4, waste heat recovery:

[0079] The waste heat recovery module extracts heat from the granulation and condensation process through the heat exchange device for process heating or other needs. The heat exchanger in this module is made of high-efficiency thermal conductive materials, which can concentrate the heat released during the condensation and granulation process and transfer it to process equipment, such as process hot water devices, process preheating equipment or heating systems. This step ensures that the waste heat released during the granulation and cooling of metallurgical waste slag can be maximized and reused, which not only reduces the overall energy consumption, but also provides additional thermal energy resources.

[0080] S5. Circulating water utilization:

[0081] The condensed liquid water returns to the spray cooling module through the circulating water module, forming a closed-loop circulating water system. The water storage tank in the system is used to store the cooling water recovered by the condensation module, and the circulating pump ensures that the water can be stably transported to the spray device for recycling. At the same time, the circulating water system is equipped with a filtering device to remove impurities in the cooling water and ensure the cleanliness of the cooling water. The filtered and purified cooling water is transported to the spray cooling module again for reuse, effectively reducing the consumption of fresh water resources and improving the resource utilization of the entire system.

[0082] S6. Waste gas treatment:

[0083] The waste gas generated during the granulation and cooling process is treated by the waste gas treatment module. The waste gas first passes through the dust removal device to remove the particulate matter in it, ensuring that the subsequent purification process will not be interfered with by particle pollution. Then, the waste gas passes through the gas purification equipment to remove harmful chemicals contained in the waste gas, including sulfur oxides (SOx), nitrogen oxides (NOx), etc. Through the multi-stage purification system, the harmful substances in the waste gas are thoroughly filtered or chemically absorbed, and finally meet the environmental protection standards. The treated waste gas can be discharged safely to avoid secondary pollution to the environment.

[0084] Method summary:

[0085] The waste heat recovery method for metallurgical waste slag wind quenching granulation into beads realizes the rapid cooling and granulation of metallurgical waste slag by combining efficient wind quenching granulation with spray cooling. Through the condensation and waste heat recovery module, the heat energy in the granulation and cooling process is fully utilized, and the waste heat is recovered for process heating or heating, thereby improving the energy utilization rate of the system. The whole method has significant energy-saving and environmental benefits, especially in water resource circulation and waste gas treatment, which can meet strict environmental protection requirements and has broad industrial application prospects.

[0086] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A waste heat recovery system for metallurgical waste slag wind quenching granulation into beads, characterized in that: include: The slag air quenching granulation module is used to cool and granulate the molten high-temperature metallurgical slag through high-speed airflow to form granular or beaded solids; A spray cooling module is arranged above or around the waste slag air quenching granulation module, and the spray cooling module absorbs heat in the waste slag and exhaust gas by spraying cooling medium to generate cooling medium steam; A condensation module, connected to the spray cooling module, for condensing the cooling medium vapor into a liquid cooling medium; The waste heat recovery module extracts the waste heat generated during the waste slag granulation process and the cooling medium condensation process from the waste slag air quenching granulation module and the condensation module through a heat exchange device, and provides it to the modules that need thermal energy; A circulating water module, used for collecting the cooling medium recovered from the spray cooling module and the condensing module and recycling it to the spray cooling module; The waste gas treatment module is connected to the waste slag air quenching granulation module and the spray cooling module, and is used for purifying harmful substances in the waste gas.

2. The waste heat recovery system for metallurgical waste slag wind quenching granulation into beads according to claim 1 is characterized in that: The waste slag wind quenching granulation module includes a granulation device, which quickly cools and granulates the molten waste slag through a high-pressure airflow. The high-pressure airflow is provided by a high-pressure fan of the granulation device, and the airflow is evenly distributed on the surface of the waste slag through a nozzle of a specific shape, so that the cooling speed is constant to generate granular or beaded waste slag of uniform size.

3. The waste heat recovery system for metallurgical waste slag wind quenching granulation into beads according to claim 1 is characterized in that: The spray cooling module includes multiple spray devices, each of which is provided with an automatic regulating valve, which can automatically adjust the spraying amount of the cooling medium according to the temperature of the waste slag and the air flow velocity, and cover the granulation area through multiple cooling nozzles to ensure sufficient contact between the waste slag and the high-temperature gas.

4. The waste heat recovery system for metallurgical waste slag wind quenching granulation into beads according to claim 1 is characterized in that: The condensation module comprises a condensation device, which comprises a plurality of condensation pipes and a metal condensation plate, and condenses the cooling medium vapor into a liquid state through cooling water circulation.

5. The waste heat recovery system for metallurgical waste slag wind quenching granulation into beads according to claim 1 is characterized in that: The waste heat recovery module includes a heat exchanger, which is made of heat-conducting material and can transfer waste heat generated during the condensation process and the waste slag granulation process. The waste heat is transferred to other modules through the heat transfer medium water or steam for process heating or space heating.

6. The waste heat recovery system for metallurgical waste slag wind quenching granulation into beads according to claim 1 is characterized in that: The circulating water module includes a water storage tank, a circulating pump and a filtering device. The water storage tank is used to store the cooling medium recovered by the condensing module, the circulating pump is used to re-transport the recovered cooling medium to the spray cooling module, and the filtering device is used to remove impurities in the cooling medium.

7. The waste heat recovery system for metallurgical waste slag wind quenching granulation into beads according to claim 1 is characterized in that: The exhaust gas treatment module includes a multi-stage exhaust gas purification system, which includes a dust collector, a gas filter and a desulfurization and denitration device. The dust collector is used to capture particulate matter in the exhaust gas, the gas filter is used to remove harmful chemicals in the gas, and the desulfurization and denitration device is used to treat sulfur oxides and nitrogen oxides in the exhaust gas; The heat exchanger in the waste heat recovery module is connected to the heating system of the building or factory, and is used to transfer the recovered waste heat to the heating system through a heat transfer medium, thereby realizing secondary utilization of the waste heat.

8. A method for recovering waste heat from metallurgical waste slag granulation into beads by air quenching, characterized in that: The waste heat recovery system for metallurgical waste slag air quenching granulation into beads according to any one of claims 1 to 7 comprises the following steps: S1. Waste slag melting treatment: The high-temperature metallurgical slag is discharged from the smelting furnace and transported to the slag wind quenching granulation device, where the slag is in a molten state and the temperature is between 1200°C and 1600°C; Air quenching granulation: The slag wind quenching granulation module uses high-speed airflow to quickly cool the molten metallurgical slag and break it into granular or beaded solids. This process uses the airflow provided by the high-pressure fan to quickly cool the slag surface to generate small granular slag; S2, spray cooling: During the granulation process, a spray cooling module is used to perform secondary cooling on high-temperature waste slag and waste gas. By adjusting the water volume of the spray device and spraying cooling water according to the waste slag temperature and air flow velocity, the temperature of the granulated waste slag is further reduced. At the same time, the high-temperature waste gas generated during the granulation process is captured, its heat is absorbed, and cooling water vapor is generated; S3, water vapor condensation: The water vapor generated during the spray cooling process is condensed by the condensation module. The water vapor is cooled into liquid water after passing through the condensation pipe and the condensation plate. The condensed water is introduced into the circulating water system for subsequent recycling. The waste heat released during the condensation process is transferred to the waste heat recovery module through the metal plate of the condensation device. S4, waste heat recovery: Recovering heat from the air quenching granulation and condensation process by a waste heat recovery module, the waste heat recovery module including a heat exchange device for transferring heat extracted from the granulation and condensation process to process hot water, process preheating equipment or a heating system; S5. Circulating water utilization: The liquid water generated after condensation returns to the spray cooling module through the circulating water module. The circulating water system ensures the continuous supply of cooling water through the water storage tank and the circulating pump, and purifies the recycled water through the filtering device to remove impurities; S6. Waste gas treatment: The waste gas generated during the granulation and cooling process is treated by the waste gas treatment module. The waste gas first passes through the dust removal device to remove particulate matter, and then passes through the gas purification equipment to remove harmful substances.

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