Hot slag air quenching granulation waste heat recovery system

Abstract

The utility model relates to a hot slag air quenching granulation waste heat recovery system which comprises an air quenching chamber, a material conveying assembly, a membrane cooler, a boiler assembly and a discharging assembly. A buffer pool and a nozzle are arranged in the air quenching chamber. A plurality of discharging holes are formed in the bottom wall of the buffer pool. And hot slag enters the air quenching chamber and then falls to the material conveying assembly through the discharging hole. The nozzle is located below the buffer pool and used for scattering the hot slag into coarse sand. And the material conveying assembly is used for conveying the coarse sand into the membrane type cooler. And the membrane cooler is used for cooling the coarse sand to generate high-temperature water and inputting the high-temperature water into the boiler assembly. The boiler assembly includes a steam generator. The steam generator is used for enabling high-temperature water in the steam generator to form saturated steam and saturated water under heating of the boiler body. And the saturated steam is discharged through the discharging assembly. And the saturated water flows back to the membrane cooler and exchanges heat with the coarse sand again to form high-temperature water. According to the system, waste of water resources and waste heat resources is reduced, two byproducts of finished sand and saturated steam are generated, and the economical efficiency is good.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of waste residue treatment heat recovery, particularly relates to a hot furnace slag air granulation waste heat recovery system. BACKGROUND

[0002] Water quenching process is to use water as quenching agent for quenching. In the prior art, the high-temperature molten slag produced by the electric arc furnace is treated by water quenching, and then screened, dewatered, crushed and screened again to form finished machine-made sand. The product is mainly used in the building material industry for cement mortar and concrete admixture, and can also be used as a roadbed cushion.

[0003] The water quenching system mainly includes a water quenching pool and a water spraying circulating system. The hot molten slag has a temperature of about 1500-1600 DEG C. The high-temperature liquid molten slag flows out of the slag outlet, falls in the high-temperature refractory slag outlet groove in a parabolic shape, and flows along the slope of the high-temperature slag groove to the end and falls into the water flushing slag groove. The high-temperature molten slag is scattered by the high-pressure water installed below the flushing slag groove and falls into the flushing slag pool, and then is taken out by the water pool water slag grabbed by the flushing trestle car grab bucket.

[0004] The above process is carried out in an open air condition. When the high-temperature molten slag contacts with water, a large amount of white steam is generated, and the waste heat resource and water resource are wasted seriously, and the economy is poor. UTILITY MODEL CONTENT

[0005] In order to solve the above technical problems, the utility model provides a hot furnace slag air quenching granulation waste heat recovery system.

[0006] The hot furnace slag air quenching granulation waste heat recovery system provided by the utility model adopts the following technical scheme:

[0007] A hot slag air-quenching granulation waste heat recovery system includes: an air-quenching chamber, a conveying assembly, a membrane cooler, a boiler assembly, and a discharge assembly. The air-quenching chamber has a slag inlet on its side wall for introducing hot slag from a submerged arc furnace into the air-quenching chamber. The air-quenching chamber is equipped with a buffer tank and nozzles. The nozzles spray water onto the hot slag as it enters the buffer tank, breaking it down into coarse sand. The buffer tank can hold the coarse sand. The conveying assembly feeds the coarse sand into the membrane cooler. The membrane cooler cools the coarse sand, generating high-temperature water, which is then fed into the boiler assembly. The boiler assembly includes a boiler body and a steam generator. The steam generator is located within the boiler body and communicates with the membrane cooler. The steam generator, heated by the boiler body, causes the high-temperature water within it to form saturated steam and saturated water. The saturated steam is discharged through the discharge assembly. The saturated water flows back into the membrane cooler to exchange heat with the coarse sand again, forming the high-temperature water.

[0008] Optionally, the top of the air quenching chamber is provided with a steam outlet; the steam outlet is connected to the steam generator through a steam pipe; the steam outlet is used to introduce the steam generated when the nozzle sprays water onto the hot slag into the steam generator.

[0009] Optionally, the air quenching chamber is equipped with a radiant heat exchanger and a circulation pipeline; the radiant heat exchanger is located at the upper part of the air quenching chamber; one side of the circulation pipeline loop is located inside the radiant heat exchanger, and the other side is located inside the steam generator; circulating water flows through the circulation pipeline.

[0010] Optionally, the conveying assembly includes a lifting roller, a buffer tank, and an overhead crane; the lifting roller is positioned below the buffer tank so that the coarse sand in the buffer tank can fall onto the lifting roller through the discharge hole; the buffer tank is positioned downstream of the lifting roller in the conveying direction and is used to hold the coarse sand conveyed by the lifting roller; the overhead crane is used to hoist the buffer tank containing a specified weight of coarse sand to the membrane cooler, transfer the coarse sand in the buffer tank to the membrane cooler, and then hoist the buffer tank back to the lifting roller to continue holding the coarse sand.

[0011] Optionally, there are multiple buffer tanks; the overhead crane is used to lift one of the buffer tanks when the coarse sand in one of the buffer tanks reaches the specified weight, and at the same time lift another empty buffer tank to the lifting roller to continue filling the coarse sand.

[0012] Optionally, it also includes a screening assembly; the screening assembly includes a drum screen; the membrane cooler has a discharge port, which is connected to the inlet of the drum screen; the coarse sand cooled in the membrane cooler enters the drum screen through the discharge port for screening to obtain finished sand with the required fineness.

[0013] Optionally, a water supply component is also included; the water supply component is connected to the membrane cooler and is used to replenish water to the membrane cooler to maintain a stable water volume in the membrane cooler.

[0014] Optionally, the boiler body has a first steam outlet and a second steam outlet; wherein, the first steam outlet is connected to a steam pipeline network for selling steam; and the second steam outlet is connected to a plant steam pipeline for meeting the heat demand of the plant area where the hot slag air quenching granulation waste heat recovery system is located.

[0015] Optionally, the boiler assembly also includes a flue gas treatment component; the boiler assembly further includes a chimney; the chimney is connected to the boiler body and is used for flue gas discharge; the flue gas treatment component includes a dust collector; the dust collector is disposed between the boiler body and the chimney and is used for dust removal from the flue gas.

[0016] As described above, the hot slag air quenching granulation waste heat recovery system of this utility model has at least the following beneficial effects:

[0017] 1. Compared with existing technologies, the hot slag air-quenching granulation waste heat recovery system of this utility model sets the process of spraying water onto the hot slag in the air-quenching chamber. The generated steam is introduced into a steam generator for utilization, reducing water waste. Simultaneously, the heat in the hot slag is utilized by the boiler components, generating high-temperature flue gas, saturated steam, and saturated water, effectively recovering the waste heat of the hot slag and reducing waste of waste heat resources. Furthermore, because the air-quenching process is carried out under the closed conditions of the air-quenching chamber, it helps improve the working environment and reduces health hazards to workers.

[0018] 2. Compared with manufactured sand, the finished sand produced by the hot slag air quenching granulation waste heat recovery system of this utility model has more stable physical and chemical properties, which facilitates subsequent resource utilization, has broad market application prospects, and effectively improves the added value of by-products. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the waste heat recovery system for hot slag air quenching granulation.

[0020] Attached reference numerals: 1. Submerged arc furnace; 2. Air quenching chamber; 21. Slag inlet; 22. Buffer tank; 23. Nozzle; 24. Steam outlet; 25. Steam pipe; 26. Radiant heat exchanger; 27. Circulation pipeline; 3. Membrane cooler; 31. Outer shell; 32. Cylinder; 33. Cooling water pipe; 34. Feed inlet; 35. Discharge outlet; 4. Lifting roller; 5. Buffer tank; 6. Rotary drum screen; 7. Boiler body; 8. Steam generator; 9. Dust collector; 10. Chimney. Detailed Implementation

[0021] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. It should also be understood that the terminology used in the embodiments of this utility model is for describing specific implementation schemes and not for limiting the scope of protection of this utility model. Test methods in the following embodiments that do not specify specific conditions are generally performed under conventional conditions or according to the conditions recommended by the respective manufacturers.

[0022] It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings of this specification are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of implementation of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of this utility model, should still fall within the scope of the technical content disclosed in this utility model. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity of description and are not intended to limit the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of implementation of this utility model.

[0023] Please refer to Figure 1This utility model discloses a hot slag air-quenching granulation waste heat recovery system. The system includes an air-quenching chamber 2, a conveying assembly, a membrane cooler 3, a boiler assembly, and a discharge assembly. A slag inlet 21 is provided on the side wall of the air-quenching chamber 2. This inlet is used to introduce hot slag generated by the submerged arc furnace 1 into the air-quenching chamber 2. A buffer tank 22 and nozzles 23 are provided inside the air-quenching chamber 2. The buffer tank 22 is connected to the slag inlet 21 and is used to contain the hot slag. Multiple discharge holes are provided on the bottom wall of the buffer tank 22. The hot slag falls through the discharge holes to the conveying assembly. The nozzles 23 are located below the buffer tank 22 and are used to spray high-pressure water onto the falling hot slag, breaking it down into coarse sand. The conveying assembly is used to feed the coarse sand into the membrane cooler 3. The membrane cooler 3 cools the coarse sand, generates high-temperature water, and feeds the high-temperature water into the boiler assembly. The boiler assembly includes a boiler body 7 and a steam generator 8. A steam generator 8 is installed inside the boiler body 7 and connected to the membrane cooler 3. The steam generator 8 is used to heat the high-temperature water inside the boiler body 7, causing it to form saturated steam and saturated water. The saturated steam is discharged through a discharge assembly. The saturated water flows back into the membrane cooler 3 to re-exchange heat with the coarse sand, forming high-temperature water again.

[0024] Specifically, the buffer tank 22 serves to ensure that hot slag falls from the discharge holes at a stable flow rate, with minimal impact from the flow rate of hot slag at the slag inlet 21. The number of discharge holes and the size of each discharge hole can be designed according to actual production needs.

[0025] The nozzle 23 is connected to a compressed air pipe and a water pipe, and the compressed air drives the water flow to be sprayed out from the nozzle 23. In a preferred embodiment of this utility model, the nozzle 23 is an atomizing nozzle 23 with a diameter of 2 mm. The water flow is atomized by the nozzle 23 to form an atomized airflow with a humidity of 100%-120%, a pressure of 0.6 MPa-1.0 MPa, a flow rate of 12 m3 / min-20 m3 / min, and a minimum flow velocity of 6 m / s.

[0026] The membrane cooler 3 includes a shell 31, a cylinder 32, and cooling water pipes 33. Both the shell 31 and the cylinder 32 are hollow cylindrical structures. The cylinder 32 is rotatably mounted inside the shell 31 and contains a spiral structure. The cylinder 32 can rotate around its own axis under the drive of a motor. The cooling water pipes 33 are coiled inside the wall of the shell 31 or on its inner surface. The flow direction of the water in the cooling water pipes 33 is opposite to the rotation direction of the cylinder 32. The shell 31 has an inlet 34 and an outlet 35, located at opposite ends of the length of the shell 31. The inlet 34 communicates with the interior of the cylinder 32, allowing coarse sand from the conveying assembly to enter the cylinder 32. As the cylinder 32 rotates, the spiral structure transports the coarse sand to the outlet 35 for discharge. During the rotation of the cylinder 32, the water in the cooling water pipe 33 absorbs heat from the coarse sand and becomes high-temperature water, which is then circulated to the steam generator 8 for evaporation. Under the heating of the boiler body 7, the high-temperature water forms saturated steam and saturated water. The saturated water then re-enters the cooling water pipe 33 and flows back to the membrane cooler 3 to exchange heat with the coarse sand.

[0027] During the circulation process, a portion of the water in the cooling water pipe 33 is converted into saturated steam and cannot flow back into the cooling water pipe 33, resulting in a reduction in water volume. Therefore, the hot slag air quenching granulation waste heat recovery system of this utility model also includes a water supply component. The water supply component includes a water source, a flow valve, and a water supply pipeline. The water source is connected to the cooling water pipe 33 through the water supply pipeline. The flow valve is installed on the water supply pipeline. The flow valve can control the water flow rate in the water supply pipeline. By adjusting the water flow rate in the water supply pipeline according to the evaporation rate of the high-temperature water in the steam generator 8, the water volume in the mode cooler can be kept stable.

[0028] When hot slag is abraded into coarse sand by nozzle 23, steam is generated. This steam has a high temperature and can be utilized. Therefore, to utilize the heat in the steam generated when the hot slag is abraded into coarse sand, a steam outlet 24 is provided at the top of the air quenching chamber 2. The steam outlet 24 is connected to the steam generator 8 via a steam pipe 25. The steam outlet 24 is used to guide the steam generated when water is sprayed onto the hot slag by nozzle 23 into the steam generator 8. By utilizing the heat in the steam generated when the hot slag is abraded into coarse sand, the efficiency of the hot slag air quenching granulation waste heat recovery system of this invention can be further improved.

[0029] After the hot slag enters the air quenching chamber 2, some of its heat is dissipated through thermal radiation. Due to the high temperature of the hot slag, the radiated heat can also be utilized. To utilize this heat, a radiant heat exchanger 26 and a circulation pipeline 27 are installed in the air quenching chamber 2. The radiant heat exchanger 26 is located at the top of the air quenching chamber 2. One side of the circulation pipeline 27 is located inside the radiant heat exchanger 26, and the other side is located inside the steam generator 8. Circulating water flows through the circulation pipeline 27. The circulating water absorbs heat and heats up in the air quenching chamber 2, then flows to the steam generator 8 to evaporate and generate steam. This steam is discharged together with the steam generated from the vaporization of the high-temperature water in the membrane cooler 3. Continuously replenishing the circulation pipeline 27 with water allows for the continuous absorption of heat radiated from the hot slag in the air quenching chamber 2, further improving the efficiency of the hot slag air quenching granulation waste heat recovery system of this invention.

[0030] In existing technologies, belt scales are commonly used for quantitative conveying of hot slag. However, due to the limited conveying efficiency of belt scales and the fluctuations in the amount of hot slag produced by the electric arc furnace 1, the belt scales experience severe material accumulation during the conveying process, resulting in low efficiency. To improve the conveying efficiency of hot slag, the conveying assembly includes a lifting roller 4, a buffer tank 5, and an overhead crane (not shown in the figure). The lifting roller 4 is positioned below the buffer pool 22, allowing coarse sand in the buffer pool 22 to fall onto the lifting roller 4 through the discharge hole. The buffer tank 5 is positioned downstream of the lifting roller 4 in the conveying direction and is used to hold the coarse sand conveyed by the lifting roller 4. The overhead crane is used to lift the buffer tank 5, which contains a specified weight of coarse sand, to the membrane cooler 3, transfer the coarse sand in the buffer tank 5 to the membrane cooler 3, and then lift the buffer tank 5 back to the lifting roller 4 to continue holding coarse sand.

[0031] Whenever the coarse sand in the buffer tank 5 reaches the specified weight, the buffer tank 5 is emptied by an overhead crane and then returned to its original position. The coarse sand is directly conveyed into the buffer tank 5 by the lifting roller 4, so there is no problem of material accumulation.

[0032] During the process of the overhead crane lifting the buffer tank 5, the lifting roller 4 needs to stop conveying. To avoid this situation and further improve the conveying efficiency of the conveying assembly, multiple buffer tanks 5 are used. Only one buffer tank 5 receives coarse sand from the lifting roller 4 at a time. When the coarse sand in the buffer tank 5 reaches the specified weight, the overhead crane lifts it to the membrane cooler 3, while simultaneously lifting another empty buffer tank 5 to the lifting roller 4 to continue holding coarse sand. By increasing the number of buffer tanks 5, the lifting roller 4 can continue to work while the overhead crane lifts a buffer tank 5 containing the specified weight, improving the conveying efficiency of the coarse sand. In a preferred embodiment of this invention, there are three buffer tanks 5, with a specified weight of 10 tons. In other embodiments of this invention, the number of buffer tanks 5 and the specified weight can be adjusted appropriately according to the round-trip time of the overhead crane lifting the buffer tanks 5.

[0033] In the waste heat recovery process, the coarse sand formed by spraying water through nozzle 23 to dissipate heat from the slag has a low value. To increase the added value of the coarse sand product, the hot slag air-quenching granulation waste heat recovery system of this utility model also includes a screening component. The screening component includes a drum screen 6. The discharge port 35 on the outer shell 31 of the membrane cooler 3 is connected to the inlet 34 of the drum screen 6. The coarse sand cooled in the membrane cooler 3 enters the drum screen 6 through the discharge port 35 for screening to obtain finished sand with the required fineness. In a preferred embodiment of this utility model, the drum screen 6 adopts a 20-mesh sieve. By setting the screening component, the economic efficiency of the hot slag air-quenching granulation waste heat recovery system can be effectively improved.

[0034] In addition to the finished sand, the hot slag air-quenching granulation waste heat recovery system of this utility model also has a byproduct: saturated steam generated in the steam generator 8. To utilize this saturated steam, the boiler body 7 has a first steam outlet and a second steam outlet. The first steam outlet is connected to the steam pipeline network for selling the saturated steam. The second steam outlet is connected to the plant steam pipeline 25 to meet the heat demand of the plant area where the hot slag air-quenching granulation waste heat recovery system is located, for example, for preheating the sintering mixture.

[0035] In addition, the boiler assembly also includes a chimney 10. The chimney 10 is connected to the boiler body 7 and is used for flue gas emission. However, direct emission of flue gas causes environmental pollution. To reduce the environmental pollution caused by the boiler assembly, the hot slag air quenching granulation waste heat recovery system of this invention also includes a flue gas treatment assembly. The flue gas treatment assembly includes a dust collector 9. The dust collector 9 is located between the boiler body 7 and the chimney 10 and is used to remove dust from the flue gas. When the flue gas is emitted after dust removal, its environmental pollution is greatly reduced.

[0036] The following uses RKEF submerged arc furnace slag made from laterite nickel ore as an example to illustrate the implementation principle of this utility model:

[0037] Hot slag at 1500℃ in the electric arc furnace 1 enters the air quenching chamber 2 through the slag inlet 21. It falls through the discharge hole on the buffer pool 22 and is dispersed into coarse sand by water sprayed from the nozzle 23 during its descent, reducing its temperature to 800℃-900℃. The coarse sand is then conveyed to the membrane cooler 3 via the conveying assembly to exchange heat with water in the cooling water pipe 33. After its temperature drops to 110℃-130℃, it is discharged into the screening assembly and subsequently screened into finished sand for sale. Steam generated during the dissipation of slag in the air quenching chamber 2 is introduced into the steam generator 8 through the steam outlet 24 at the top of the air quenching chamber 2. A portion of the heat radiated by the hot slag is absorbed by the radiant heat exchanger 26 located at the top of the air quenching chamber 2, and this heat is introduced into the steam generator 8 through the circulating water in the circulation pipe 27. The high-temperature water generated by the membrane cooler 3 during heat exchange with the coarse sand is also introduced into the steam generator 8. In steam generator 8, saturated steam and saturated water are obtained by utilizing the waste heat of hot slag. The saturated steam can be sold directly or used by the waste heat recovery system of hot slag air quenching granulation in the plant area for preheating sintering mixtures, etc. The saturated water flows back to membrane cooler 3 to exchange heat with coarse sand again.

[0038] Compared with existing technologies, this utility model's hot slag air-quenching granulation waste heat recovery system sets the process of spraying water onto the hot slag in the air-quenching chamber 2. The generated steam is introduced into the steam generator 8 for utilization, reducing water waste. Simultaneously, the heat in the hot slag is utilized by the boiler components, generating high-temperature flue gas, saturated steam, and saturated water, effectively recovering the waste heat from the hot slag and reducing waste of waste heat resources. Furthermore, because the air-quenching process is carried out under the closed conditions of the air-quenching chamber 2, it helps improve the working environment and reduces health hazards to workers.

[0039] Furthermore, the finished sand produced by the hot slag air quenching granulation waste heat recovery system of this utility model has more stable physical and chemical properties compared with manufactured sand, which facilitates subsequent resource utilization, has broad market application prospects, and effectively improves the added value of by-products.

[0040] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A waste heat recovery system for hot slag air quenching granulation, characterized in that, include: The components include: air quenching chamber (2), material conveying assembly, membrane cooler (3), boiler assembly, and discharge assembly; among which, The side wall of the air quenching chamber (2) is provided with a slag inlet (21) for introducing hot slag generated by the electric arc furnace (1) into the air quenching chamber (2). The air quenching chamber (2) is equipped with a buffer pool (22) and a nozzle (23); the buffer pool (22) is connected to the slag inlet (21) and is used to contain the hot slag; multiple discharge holes are opened on the bottom wall of the buffer pool (22); the hot slag falls into the conveying assembly through the discharge holes; the nozzle (23) is located below the buffer pool (22) and is used to spray high-pressure water onto the falling hot slag to break it into coarse sand; The material conveying assembly is used to feed the coarse sand into the membrane cooler (3); The membrane cooler (3) is used to cool the coarse sand, generate high-temperature water, and input the high-temperature water into the boiler assembly; The boiler assembly includes a boiler body (7) and a steam generator (8); the steam generator (8) is disposed inside the boiler body (7) and communicates with the membrane cooler (3); the steam generator (8) is used to heat the high-temperature water inside the boiler body (7) to form saturated steam and saturated water; the saturated steam is discharged through the discharge assembly; the saturated water flows back into the membrane cooler (3) to exchange heat with the coarse sand again to form the high-temperature water.

2. The hot slag air-quenching granulation waste heat recovery system according to claim 1, characterized in that: The top of the air quenching chamber (2) is provided with a steam outlet (24); the steam outlet (24) is connected to the steam generator (8) through a steam pipe (25); the steam outlet (24) is used to introduce the steam generated when the nozzle (23) sprays water onto the hot slag into the steam generator (8).

3. The hot slag air quenching granulation waste heat recovery system according to claim 2, characterized in that: The air quenching chamber (2) is equipped with a radiant heat exchanger (26) and a circulation pipeline (27). The radiant heat exchanger (26) is located at the top of the air quenching chamber (2); one side of the circulation pipeline (27) is located inside the radiant heat exchanger (26), and the other side is located inside the steam generator (8); circulating water is introduced into the circulation pipeline (27).

4. The hot slag air-quenching granulation waste heat recovery system according to claim 1, characterized in that: The material conveying assembly includes a lifting roller (4), a buffer tank (5), and an overhead crane; The lifting roller (4) is positioned below the buffer pool (22) so that the coarse sand in the buffer pool (22) can fall onto the lifting roller (4) through the discharge hole; The buffer tank (5) is located downstream of the conveying direction of the lifting roller (4) and is used to hold the coarse sand conveyed by the lifting roller (4). The overhead crane is used to lift the buffer tank (5) containing a specified weight of coarse sand to the membrane cooler (3), transfer the coarse sand in the buffer tank (5) to the membrane cooler (3), and then lift the buffer tank (5) to the lifting roller (4) to continue holding the coarse sand.

5. The hot slag air quenching granulation waste heat recovery system according to claim 4, characterized in that: The number of the buffer tanks (5) is multiple; The overhead crane is used to lift the coarse sand in one of the buffer tanks (5) when it reaches the specified weight, and at the same time lift another empty buffer tank (5) to the lifting roller (4) to continue to hold the coarse sand.

6. The hot slag air-quenching granulation waste heat recovery system according to claim 1, characterized in that: It also includes a screening assembly; The screening assembly includes a drum screen (6); the membrane cooler (3) has a discharge port (35), which is connected to the inlet (34) of the drum screen (6); the coarse sand cooled in the membrane cooler (3) enters the drum screen (6) through the discharge port (35) for screening to obtain finished sand with the required fineness.

7. The hot slag air-quenching granulation waste heat recovery system according to claim 1, characterized in that, It also includes water supply components; The water supply component is connected to the membrane cooler (3) and is used to replenish water to the membrane cooler (3) to maintain a stable water volume in the membrane cooler (3).

8. The hot slag air-quenching granulation waste heat recovery system according to claim 1, characterized in that, The boiler body (7) has a first steam outlet and a second steam outlet; wherein, The first steam outlet is connected to a steam pipeline network and is used to sell the saturated steam; The second steam outlet is connected to the plant steam pipeline (25) to meet the heat demand of the plant area where the hot slag air quenching granulation waste heat recovery system is located.

9. The hot slag air-quenching granulation waste heat recovery system according to claim 1, characterized in that, It also includes flue gas treatment components; The boiler assembly also includes a chimney (10); the chimney (10) is connected to the boiler body (7) and is used for the discharge of flue gas; The flue gas treatment assembly includes a dust collector (9); the dust collector (9) is disposed between the boiler body (7) and the chimney (10) for removing dust from the flue gas.

Images