Hot slag air quenching granulation waste heat recovery system

Abstract

The invention 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. 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 invention relates to the technical field of heat recovery in waste slag treatment, and in particular to a hot slag air quenching granulation waste heat recovery system. Background Art

[0002] The water quenching process uses water as a quenching agent for quenching. In the prior art, the high-temperature slag produced by the ore-fired furnace is treated by water quenching, and then screened, dehydrated, crushed, and re-screened to form finished machine-made sand. The product is mainly used in the building materials industry for cement mortar and concrete admixtures, and can also be used as a roadbed cushion.

[0003] The water quenching system mainly includes water quenching pool, water spray circulation system and other parts. The slag discharge temperature of hot slag is about 1500℃-1600℃, and the high-temperature liquid slag flows out from the slag discharge eye, and the high-temperature slag flows into the high-temperature refractory slag discharge ditch in a parabolic shape, and flows along the slope of the high-temperature slag ditch to the end and falls into the water slag ditch. On the way to falling into the water slag, the high-temperature slag flow is broken up by the high-pressure water installed below the slag ditch and falls into the slag ditch, and then brought into the slag slag pool by the high-pressure slag slag water, and the slag slag in the water pool is grabbed by the slag slag trestle crane grab and drained out.

[0004] The above process is carried out under open conditions. When the high-temperature slag comes into contact with water, a large amount of white steam will be generated, resulting in serious waste of waste heat and water resources and poor economic efficiency. Summary of the invention

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

[0006] The hot slag air quenching granulation waste heat recovery system provided by the present invention adopts the following technical solutions:

[0007] A hot slag air quenching granulation waste heat recovery system, comprising: an air quenching chamber, a feeding assembly, a film cooler, a boiler assembly, and a discharge assembly; wherein a slag inlet is provided on the side wall of the air quenching chamber; the inlet is used to pass the hot slag generated by the ore-fired furnace into the air quenching chamber; a buffer tank and a nozzle are provided in the air quenching chamber; the nozzle is used to spray water on the hot slag on the way into the buffer tank to break up the hot slag into coarse sand; the buffer tank can accommodate the coarse sand; the feeding assembly is used to input the coarse sand into the film cooler; the film cooler is used to cool the coarse sand, generate high-temperature water, and input the high-temperature water into the boiler assembly; the boiler assembly comprises a boiler body and a steam generator; the steam generator is arranged in the boiler body and is connected to the film cooler; the steam generator is used to form saturated steam and saturated water from the high-temperature water in the steam generator under the heating of the boiler body; the saturated steam is discharged through the discharge assembly; the saturated water flows back to the film cooler to exchange heat with the coarse sand again to form the high-temperature water.

[0008] Optionally, a steam outlet is provided at the top of the air quenching chamber; 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, a radiation heat exchanger and a circulation pipeline are provided in the air quenching chamber; the radiation heat exchanger is located at the upper part of the air quenching chamber; one side of the circulation pipeline loop is located in the radiation heat exchanger, and the other side is located in the steam generator; circulating water is passed into the circulation pipeline.

[0010] Optionally, the material conveying assembly includes a lifting roller, a buffer material tank and an overhead crane; the lifting roller is arranged below the buffer pool; a plurality of through holes are opened on the bottom wall of the buffer pool, so that the coarse sand in the buffer pool can fall onto the lifting roller through the through holes; the buffer material tank is arranged downstream of the conveying direction of the lifting roller, and is used for holding the coarse sand transmitted by the lifting roller; the overhead crane is used for lifting the buffer material tank containing the coarse sand of a specified weight to the membrane cooler, and transferring the coarse sand in the buffer material tank to the membrane cooler, and then lifting the buffer material tank to the lifting roller to continue holding the coarse sand.

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

[0012] Optionally, it also includes a screening component; the screening component includes a drum screen; the membrane cooler has a discharge port, and the discharge port is connected to the feed port 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 a fineness that meets the requirements.

[0013] Optionally, it also includes a water supply component; the water supply component is connected to the membrane cooler and is used to replenish water into the membrane cooler to maintain a stable water level 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 the steam network for selling steam; the second steam outlet is connected to the 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, it also includes a flue gas treatment component; the boiler component also includes a chimney; the chimney is connected to the boiler body for discharging flue gas; the flue gas treatment component includes a dust collector; the dust collector is arranged between the boiler body and the chimney for removing dust from the flue gas.

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

[0017] 1. Compared with the prior art, the hot slag air quenching granulation waste heat recovery system of the present invention sets the process of spraying water on the hot slag in the air quenching chamber, and the generated steam is introduced into the steam generator for utilization, thereby reducing the waste of water resources. At the same time, the heat in the hot slag is utilized by the boiler assembly, which not only produces high-temperature flue gas, but also produces saturated steam and saturated water, effectively recovering the waste heat of the hot slag and reducing the waste of waste heat resources. And because the air quenching process is carried out under the closed conditions of the air quenching chamber, it is conducive to improving the working environment and can reduce the harm to the health of the staff.

[0018] 2. Compared with machine-made sand, the finished sand produced by the hot slag air quenching granulation waste heat recovery system of the present invention has more stable physical and chemical properties, is convenient for subsequent resource utilization, has broad market application prospects, and effectively increases the added value of by-products. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0020] Figure 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. Shell; 32. Cylinder; 33. Cooling water pipe; 34. Feed inlet; 35. Discharge outlet; 4. Lifting roller; 5. Buffer tank; 6. Drum screen; 7. Boiler body; 8. Steam generator; 9. Dust collector; 10. Chimney. DETAILED DESCRIPTION

[0021] The following is an explanation of the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the features in the following embodiments and the embodiments can be combined with each other without conflict. It should also be understood that the terms used in the embodiments of the present invention are intended to describe specific embodiments, rather than to limit the scope of protection of the present invention. The test methods for which specific conditions are not specified in the following examples are usually carried out under conventional conditions or according to the conditions recommended by the manufacturers.

[0022] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0023] Please refer to Figure 1The present invention discloses a waste heat recovery system for hot slag air quenching granulation, which comprises an air quenching chamber 2, a feeding 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. It is used to pass the hot slag generated by the ore-fired furnace 1 into the air quenching chamber 2. A buffer tank 22 and a nozzle 23 are provided in the air quenching chamber 2. The buffer tank 22 is connected to the slag inlet 21 and is used to accommodate the hot slag. A plurality of discharge holes are provided on the bottom wall of the buffer tank 22. The hot slag falls to the feeding assembly through the discharge holes. The nozzle 23 is located below the buffer tank 22 and is used to spray high-pressure water to the falling hot slag to break the hot slag into coarse sand. The feeding assembly is used to input 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 comprises a boiler body 7 and a steam generator 8. The steam generator 8 is arranged in the boiler body 7 and is connected to the membrane cooler 3. The steam generator 8 is used to convert the high-temperature water in the steam generator 8 into saturated steam and saturated water under the heating of the boiler body 7. The saturated steam is discharged through the discharge assembly. The saturated water flows back to the membrane cooler 3 to exchange heat with the coarse sand to form high-temperature water.

[0024] Specifically, the function of the buffer pool 22 is to allow the hot slag to fall from the discharge hole at a stable flow rate, and is less affected by the flow rate of the hot slag at the slag inlet 21. The number of discharge holes and the size of each discharge hole can be designed accordingly according to actual production requirements.

[0025] The nozzle 23 is connected to a compressed air pipeline and a water pipe, and the compressed air drives the water flow to spray out from the nozzle 23. In a preferred embodiment of the present invention, the nozzle 23 is an atomizing nozzle 23, the diameter of the nozzle 23 is 2 mm, the water flow is atomized by the nozzle 23 to form an atomized air flow, the humidity of the atomized air flow is 100%-120%, the pressure is 0.6Mpa-1.0Mpa, the flow rate is 12m3 / min-20m3 / min, and the minimum flow rate is 6m / s.

[0026] The film cooler 3 includes a shell 31, a cylinder 32 and a cooling water pipe 33. The shell 31 and the cylinder 32 are both hollow cylindrical structures. The cylinder 32 is rotatably mounted inside the shell 31, and a spiral structure is arranged therein. The cylinder 32 can rotate around its own axis driven by a motor. The cooling water pipe 33 is coiled inside the wall of the shell 31, or coiled on the inner surface of the shell 31. The flow direction of water in the cooling water pipe 33 is opposite to the rotation direction of the cylinder 32. A feed port 34 and a discharge port 35 are provided on the shell 31. The feed port 34 and the discharge port 35 are respectively located at both ends of the length direction of the shell 31. The feed port 34 is connected to the inside of the cylinder 32, and the coarse sand from the feeding assembly enters the cylinder 32 through the feed port 34. While the cylinder 32 rotates, the coarse sand is transported to the discharge port 35 through the spiral structure, and the coarse sand is discharged. During the rotation of the cylinder 32, the water in the cooling water pipe 33 absorbs the heat of the coarse sand and becomes high-temperature water, which is circulated to the steam generator 8 for evaporation. The high-temperature water is heated by the boiler body 7 to form saturated steam and saturated water, which 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 of the water in the cooling water pipe 33, a part of it is always converted into saturated steam and cannot flow back into the cooling water pipe 33, resulting in a reduction in the amount of water. Therefore, the hot slag air quenching granulation waste heat recovery system of the present invention 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 arranged on the water supply pipeline. The water flow in the water supply pipeline can be controlled by the flow valve, and the water flow in the water supply pipeline is adjusted according to the evaporation amount of the high-temperature water in the steam generator 8, so as to maintain the stability of the water amount in the mode cooler.

[0028] When the hot slag is broken into coarse sand by the nozzle 23, steam is generated. The temperature of this part of steam is relatively high and can be used. Therefore, in order to utilize the heat in the steam generated when the hot slag is broken 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 through a steam pipe 25. The steam outlet 24 is used to introduce the steam generated when the nozzle 23 sprays water to the hot slag into the steam generator 8. By utilizing the heat in the steam generated when the hot slag is broken into coarse sand, the efficiency of the hot slag air quenching granulation waste heat recovery system of the present invention can be further improved.

[0029] After the hot slag enters the air quenching chamber 2, part of the heat it contains is also dissipated in the form of thermal radiation. Since the temperature of the hot slag is relatively high, the heat radiated by the hot slag can also be utilized. In order to utilize this part of the heat, a radiation heat exchanger 26 and a circulation pipeline 27 are provided in the air quenching chamber 2. The radiation heat exchanger 26 is located at the upper part of the air quenching chamber 2. One side of the loop of the circulation pipeline 27 is located in the radiation heat exchanger 26, and the other side is located in the steam generator 8. Circulating water is passed into the circulation pipeline 27. The circulating water absorbs heat and heats up in the air quenching chamber 2, and flows into the steam generator 8 to evaporate and generate steam. It is discharged together with the steam generated by the vaporization of high-temperature water in the membrane cooler 3. By continuously adding water to the circulation pipeline 27, the heat radiated by the hot slag in the air quenching chamber 2 can be continuously absorbed, which further improves the efficiency of the hot slag air quenching granulation waste heat recovery system of the present invention.

[0030] In the prior art, a belt scale is often used to quantitatively transport hot slag. However, due to the limited transport efficiency of the belt scale, the amount of hot slag produced by the ore-fired furnace 1 also fluctuates, resulting in serious material accumulation and low efficiency of the belt scale during the process of transporting hot slag. In order to improve the transport efficiency of hot slag, the feeding assembly includes a lifting roller 4, a buffer tank 5 and a crane (not shown in the figure). The feeding assembly includes a lifting roller 4, a buffer tank 5 and a crane. The lifting roller 4 is arranged below the buffer pool 22 so that the coarse sand in the buffer pool 22 can fall onto the lifting roller 4 through the feeding hole. The buffer tank 5 is arranged downstream of the conveying direction of the lifting roller 4, and is used to hold the coarse sand transmitted by the lifting roller 4. The crane is used to lift the buffer tank 5 containing a specified weight of coarse sand inside to the membrane cooler 3, and 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 to hold the coarse sand.

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

[0032] During the process of the overhead crane lifting the buffer material tank 5, the lifting roller 4 needs to stop conveying. In order to avoid this situation, the conveying efficiency of the feeding assembly is further improved. There are multiple buffer material tanks 5. At the same time, only one buffer material tank 5 receives the coarse sand conveyed by the lifting roller 4. When the coarse sand in the buffer material tank 5 reaches the specified weight, the overhead crane lifts it to the membrane cooler 3, and at the same time lifts another empty buffer material tank 5 to the lifting roller 4 to continue to hold the coarse sand. By increasing the number of buffer material tanks 5, when the overhead crane lifts the buffer material tank 5 with a specified weight, the lifting roller 4 can continue to work, thereby improving the conveying efficiency of the coarse sand. In a preferred embodiment of the present invention, the number of buffer material tanks 5 is three, and the specified weight is 10t. In other embodiments of the present invention, the number and specified weight of the buffer material tanks 5 can be appropriately adjusted according to the time it takes for the overhead crane to lift the buffer material tank 5 back and forth.

[0033] In the process of waste heat recovery, the coarse sand formed by spraying water through the nozzle 23 to blow away the hot slag is of low value. In order to increase the added value of the coarse sand product, the hot slag air quenching granulation waste heat recovery system of the present invention also includes a screening assembly. The screening assembly includes a drum screen 6. The discharge port 35 on the outer shell 31 of the membrane cooler 3 is connected to the feed port 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 a fineness that meets the requirements. In a preferred embodiment of the present invention, the drum screen 6 uses a sieve hole of 20 mesh. By setting a screening assembly, the economy of the hot slag air quenching granulation waste heat recovery system can be effectively improved during use.

[0034] In addition to the finished sand, the hot slag air quenching granulation waste heat recovery system of the present invention has another byproduct, which is the saturated steam generated in the steam generator 8. In order to utilize this part of the saturated steam, the boiler body 7 has a first steam outlet 24 and a second steam outlet 24. Among them, the first steam outlet 24 is connected to the steam pipe network for selling the saturated steam. The second steam outlet 24 is connected to the plant steam pipeline 25 to meet the heat demand of the plant where the hot slag air quenching granulation waste heat recovery system is located, such as 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 the discharge of flue gas. However, direct discharge of flue gas will cause environmental pollution. In order to reduce the pollution of the boiler assembly to the environment, the hot slag air quenching granulation waste heat recovery system of the present invention also includes a flue gas treatment assembly. The flue gas treatment assembly includes a dust collector 9. The dust collector 9 is arranged between the boiler body 7 and the chimney 10 and is used to remove dust from the flue gas. When the flue gas after dust removal is discharged, its pollution to the environment is greatly reduced.

[0036] The following takes the hot slag as laterite nickel ore RKEF submerged arc furnace 1 slag as an example to illustrate the implementation principle of the present invention:

[0037] The hot slag at 1500℃ in the ore-fired furnace 1 enters the air quenching chamber 2 through the slag inlet 21, falls through the discharge hole on the buffer pool 22, and is broken into coarse sand by the water sprayed from the nozzle 23 during the falling process, and the temperature is reduced to 800℃-900℃. The coarse sand is transported to the membrane cooler 3 through the feeding assembly to exchange heat with the water in the cooling water pipe 33. After the temperature is reduced to 110℃-130℃, it is discharged into the screening assembly and then screened into finished sand for sale. The steam generated when the hot slag is beaten 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; part of the heat radiated by the hot slag is absorbed by the radiation heat exchanger 26 set at the top of the air quenching chamber 2, and this part of the heat is introduced into the steam generator 8 through the circulating water in the circulating pipeline 27; the high-temperature water generated by the heat exchange between the membrane cooler 3 and the coarse sand is also introduced into the steam generator 8. The steam generator 8 utilizes the waste heat of the hot slag to obtain saturated steam and saturated water, of which the saturated steam is either sold directly or used by the plant where the waste heat recovery system of the hot slag air quenching granulation is located to preheat the sintering mixture, etc. The saturated water flows back to the membrane cooler 3 to exchange heat with the coarse sand again.

[0038] Compared with the prior art, the hot slag air quenching granulation waste heat recovery system of the present invention sets the process of spraying water on the hot slag in the air quenching chamber 2, and the generated steam is introduced into the steam generator 8 for utilization, thereby reducing the waste of water resources. At the same time, the heat in the hot slag is utilized by the boiler assembly, which not only produces high-temperature flue gas, but also produces saturated steam and saturated water, effectively recovering the waste heat of the hot slag and reducing the waste of waste heat resources. And because the air quenching process is carried out under the closed conditions of the air quenching chamber 2, it is conducive to improving the working environment and can reduce the harm to the health of the staff.

[0039] In addition, compared with machine-made sand, the finished sand produced by the hot slag air quenching granulation waste heat recovery system of the present invention has more stable physical and chemical properties, is convenient for subsequent resource utilization, has broad market application prospects, and effectively increases the added value of by-products.

[0040] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A hot slag air quenching granulation waste heat recovery system, characterized in that: include: air quenching chamber (2), material conveying assembly, film cooler (3), boiler assembly, and discharge assembly; wherein, A slag inlet (21) is provided on the side wall of the wind quenching chamber (2) for passing hot slag generated by the ore-fired furnace (1) into the wind quenching chamber (2); A buffer pool (22) and a nozzle (23) are provided in the wind quenching chamber (2); the buffer pool (22) is connected to the slag inlet (21) and is used to accommodate the hot slag; a plurality of discharge holes are provided on the bottom wall of the buffer pool (22); the hot slag falls to the feeding assembly through the discharge holes; the nozzle (23) is located below the buffer pool (22) and is used to spray high-pressure water to the falling hot slag to break the hot slag into coarse sand; The material feeding assembly is used to feed the coarse sand into the film cooler (3); The film 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 comprises a boiler body (7) and a steam generator (8); the steam generator (8) is arranged in the boiler body (7) and is connected to the membrane cooler (3); the steam generator (8) is used to form saturated steam and saturated water from the high-temperature water in the boiler body (7) under the heating of the boiler body (7); the saturated steam is discharged through the discharge assembly; the saturated water flows back to 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: A steam outlet (24) is provided at the top of the wind quenching chamber (2); 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 is characterized in that: The wind quenching chamber (2) is provided with a radiation heat exchanger (26) and a circulation pipeline (27); The radiation heat exchanger (26) is located at the upper part of the wind quenching chamber (2); one side of the circulation pipeline (27) loop is located in the radiation heat exchanger (26), and the other side is located in the steam generator (8); and circulating water flows 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 comprises a material lifting roller (4), a buffer material tank (5) and an overhead crane; The material raising roller (4) is arranged below the buffer pool (22) so that the coarse sand in the buffer pool (22) can fall onto the material raising roller (4) through the material discharge hole; The buffer material tank (5) is arranged downstream of the material lifting roller (4) in the conveying direction, and is used to contain the coarse sand conveyed by the material lifting roller (4); The overhead crane is used to lift the buffer tank (5) containing the coarse sand of a specified weight 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 to hold the coarse sand.

5. The hot slag air quenching granulation waste heat recovery system according to claim 1, 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 the coarse sand in the buffer tank (5) reaches the specified weight, and to lift the other 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: Also included is a screening assembly; The screening component comprises a drum screen (6); the film cooler (3) has a discharge port (35), and the discharge port (35) is connected to a feed port (34) of the drum screen (6); the coarse sand cooled in the film cooler (3) enters the drum screen (6) through the discharge port (35) for screening, thereby obtaining finished sand with a fineness that meets the requirements.

7. The hot slag air quenching granulation waste heat recovery system according to claim 1, characterized in that: Also included is a water supply assembly; The water supply component is in communication with the membrane cooler (3) and is used to replenish water into the membrane cooler (3) to maintain a stable amount of water 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 (24) and a second steam outlet (24); wherein, The first steam outlet (24) is connected to a steam pipe network and is used to sell the saturated steam; The second steam outlet (24) is connected to a 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: Also included are flue gas treatment components; The boiler assembly further comprises a chimney (10); the chimney (10) is in communication with the boiler body (7) and is used for discharging flue gas; The flue gas treatment component comprises a dust collector (9); the dust collector (9) is arranged between the boiler body (7) and the chimney (10) and is used to remove dust from the flue gas.

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