A high-temperature furnace slag waste heat recovery device

Abstract

The present application relates to the technical field of waste heat recovery, and particularly relates to a high-temperature furnace slag waste heat recovery device, which solves the problems of the existing direct contact heat exchange of cold air, which easily causes the heat exchanger hot air side flow passage to be blocked and the heat exchange surface to be covered with ash, resulting in increased thermal resistance and thus decreased heat exchange efficiency, and the service life of the heat exchanger is affected due to slag particle collision and abrasion; and the existing indirect heat exchange of molten salt, which has poor low-temperature waste heat recovery effect. The device is special in that it comprises a cylinder, a heat exchange pipe assembly arranged at the upper part of the inner cavity of the cylinder, and a coiled pipe assembly arranged at the lower part of the inner cavity of the cylinder; the top of the cylinder is provided with a cold air inlet; the bottom of the cylinder is provided with a slag outlet; the sidewall of the cylinder is sequentially provided from top to bottom with a hot air outlet, a slag inlet, a water outlet and a water inlet; the heat exchange pipe assembly is provided with an air inlet and an air outlet; the coiled pipe assembly comprises a coiled pipe; the coiled pipe is spirally wound in a shape of ascending on the inner wall of the cylinder between the water inlet and the water outlet.

Description

Technical Field

[0001] This invention relates to the field of waste heat recovery technology, and in particular to a high-temperature slag waste heat recovery device. Background Technology

[0002] Metallurgical and chemical production processes generate large amounts of high-temperature slag, which carries significant sensible heat. According to actual production statistics from blast furnaces and converters in my country, approximately 280-400 kg of high-temperature slag is produced for every ton of iron produced. The heat carried by this slag is equivalent to that generated by about 20 kg of standard coal. Similarly, approximately 120-150 kg of high-temperature steel slag is produced for every ton of steel produced, with the heat carried by this slag equivalent to that generated by about 8 kg of standard coal. Employing waste heat recovery technology to recover and utilize the sensible heat from high-temperature slag can reduce energy consumption for enterprises and help them achieve their "dual-carbon goals."

[0003] Chinese patent application number CN 112129125 A, published on December 25, 2020, entitled "High-Temperature Metallurgical Slag Gas-Solid Heat Exchange Device," discloses a high-temperature metallurgical slag gas-solid heat exchange device. This device utilizes cold air to penetrate accumulated high-temperature metallurgical slag for waste heat absorption, forming hot air that exits from the outlet. Due to the direct contact heat exchange, the heat exchange efficiency between the cold air and the high-temperature slag is high. However, because the high-temperature slag has a small particle size and accumulates densely on the support plate, the resistance drop is significant. The cold air penetrating the high-temperature slag pile needs to overcome considerable resistance loss, requiring a high-power fan. Furthermore, the hot air exiting from the top of the device carries a certain amount of fine slag particles. During heat exchange between the hot air and the heat exchange medium at the heat-using end, these particles can easily cause blockage of the hot air side flow channel of the heat exchanger, or ash accumulation on the hot air side heat exchange surface, leading to increased thermal resistance and a decrease in heat exchange efficiency. In addition, the slag particles in the hot air can also exacerbate collision and wear on the heat exchanger surface, affecting the service life of the heat exchanger.

[0004] Chinese patent application number "CN 113137865 A", application publication date "2021.07.20", entitled "A High-Temperature Solid Metallurgical Slag Particle Waste Heat Recovery Device", discloses a tube bundle type high-temperature solid metallurgical slag particle waste heat recovery device. It uses molten salt as the heat exchange medium. High-temperature molten slag enters from the top inlet of the device and indirectly exchanges heat with the molten salt in the heat exchange tube bundle during its descent, thereby cooling the high-temperature molten slag. Compared with air, molten salt has a higher thermal conductivity and heat capacity, resulting in a stronger heat exchange effect. However, its high freezing point prevents the molten slag from being cooled to a lower temperature (<150℃), causing the low-temperature waste heat of the molten slag to be unrecoverable. Currently, commercially used binary nitrates are used in the temperature range of approximately 280℃ to 560℃. For cooling high-temperature molten slag (>600℃), binary nitrates are no longer suitable, requiring molten salts with higher temperatures, but their price will also increase significantly. In addition, most high-temperature molten salts are highly corrosive, requiring the selection of corrosion-resistant metal materials to manufacture heat exchange tubes, resulting in high manufacturing costs for heat exchange tube bundles and significant upfront investment in the matching molten salt pumps and piping systems. Summary of the Invention

[0005] The purpose of this invention is to provide a high-temperature slag waste heat recovery device to solve the technical problems of existing direct cold air contact heat exchange, which easily leads to blockage of the hot air side flow channel of the heat exchanger and ash accumulation on the heat exchange surface, resulting in increased thermal resistance and decreased heat exchange efficiency. At the same time, the service life of the heat exchanger is affected by the collision and wear of slag particles; and the poor low-temperature waste heat recovery effect of existing indirect molten salt heat exchange.

[0006] The technical solution adopted in this invention is a high-temperature slag waste heat recovery device, which is special in that:

[0007] It includes a cylinder, a heat exchange tube assembly disposed in the upper part of the cylinder's inner cavity, and a coiled tube assembly disposed in the lower part of the cylinder's inner cavity;

[0008] The top of the cylinder is provided with a cold air inlet; the bottom of the cylinder is provided with a slag outlet; and the side wall of the cylinder is provided with a hot air outlet, a slag inlet, a water outlet, and a water inlet in sequence from top to bottom.

[0009] The heat exchange tube assembly is provided with an air inlet and an air outlet; after cold air enters the inner cavity of the cylinder from the cold air inlet, it enters the heat exchange tube assembly from the air inlet. After exchanging heat with the high-temperature slag outside the heat exchange tube assembly, the hot air flows out of the heat exchange tube assembly from the air outlet and then flows to the outside of the cylinder from the hot air outlet.

[0010] The coiled tube assembly includes a coiled tube; the coiled tube is spirally coiled on the inner wall of the cylinder located between the inlet and the outlet; cold water enters the coiled tube from the inlet, exchanges heat with the slag outside the coiled tube after it has been cooled by the heat exchange tube assembly, and then is discharged from the outlet.

[0011] High-temperature slag enters the inner cavity of the cylinder through the slag inlet, and after heat exchange through the heat exchange tube assembly and the coiled tube assembly, it is discharged from the slag outlet.

[0012] Furthermore, the heat exchange tube assembly includes at least one set of heat exchange tubes, as well as an inner tube support plate and an outer tube support plate;

[0013] Each heat exchange tube group includes an outer tube and an inner tube that are fitted together from the outside in; the lower end of the outer tube is closed and the upper end is open; both ends of the inner tube are open and the inner tube extends out from the upper end opening of the outer tube.

[0014] Both the inner tube support plate and the outer tube support plate are arranged perpendicular to the axis of the cylinder; the inner tube support plate is located above the hot air outlet; the outer tube support plate is located between the hot air outlet and the slag inlet; both the inner tube support plate and the outer tube support plate are sealed and fixed to the inner wall of the cylinder around the perimeter.

[0015] The inner tube support plate is vertically provided with an inner tube limiting through hole equal in number to the number of heat exchange tube groups; the diameter of the inner tube limiting through hole is adapted to the outer diameter of the inner tube; the outer tube support plate is provided with an outer tube limiting through hole at a position coaxial with the axis of each inner tube limiting through hole; the diameter of the outer tube limiting through hole is adapted to the outer diameter of the outer tube; in the same group of heat exchange tubes, the inner tube is sealed to the coaxial inner tube limiting through hole, and the outer tube is sealed to the coaxial outer tube limiting through hole. This arrangement isolates the air heat exchange medium from the slag, preventing fine slag particles from entering the hot air.

[0016] Furthermore, it also includes multiple deflectors;

[0017] The heat exchange tubes are in multiple sets, and the multiple sets of heat exchange tubes are evenly arranged inside the inner cavity of the cylinder.

[0018] Multiple guide vanes are disposed within the inner cavity of the cylinder, located between the cold air inlet and the inner tube support plate. The surface of the guide vanes is coplanar with the longitudinal section of the cylinder along its own axis, and the multiple guide vanes are evenly distributed along the circumference of the cylinder. The guide vanes allow for the even distribution of cold air to each heat exchange tube, resulting in better heat exchange performance; furthermore, the use of multiple sets of heat exchange tubes also enhances the heat exchange effect.

[0019] Furthermore, in order to enhance air-side heat exchange, the outer tube and inner tube are smooth round tubes, internally threaded tubes, or internally finned tubes.

[0020] Furthermore, to facilitate the installation of the outer and inner tubes, a shoulder is provided on the outer side of the upper end of both the outer and inner tubes.

[0021] Furthermore, in order to improve the secondary heat exchange effect of the slag after it has been cooled by the heat exchange tube assembly, and to ensure smooth slag discharge, there are at least two slag outlets; each slag outlet corresponds to a water inlet, a water outlet, and a set of coiled tube assemblies.

[0022] The inner cavity shape of the cylinder corresponding to each of the slag outlet positions is "Y".

[0023] Furthermore, there are multiple hot air outlets, and these multiple hot air outlets are evenly distributed along the circumference of the cylinder.

[0024] Furthermore, in order to achieve better heat exchange, there are multiple slag inlets, and these multiple slag inlets are evenly distributed along the circumference of the cylinder.

[0025] The beneficial effects of this invention are:

[0026] (1) The high-temperature slag waste heat recovery device of the present invention divides the waste heat recovery device into high and low temperature zones according to the different internal slag temperatures, and matches different heat exchange media to each zone. For the high-temperature zone at the top of the device, the high-temperature waste heat of the high-temperature slag is recovered through the heat exchange tube assembly. At this time, air with zero cost and a wide temperature range is used as the heat exchange medium to recover the sensible waste heat of the high-temperature slag. For the low-temperature zone at the bottom of the device, the low-temperature waste heat of the slag cooled by the heat exchange tube assembly is recovered through the coiled tube assembly. At this time, water with high heat exchange intensity is used as the heat exchange medium to cool the low-temperature slag to a lower temperature (<100°C). Through the reasonable coupling of the two heat exchange media, the temperature range for the device to recover waste heat from the slag is expanded, and the maximum degree of waste heat recovery from the high-temperature slag can be achieved. Furthermore, when using the high-temperature slag waste heat recovery device of the present invention for waste heat recovery, the air and high-temperature slag do not directly contact each other during high-temperature waste heat recovery. The high-temperature slag is located outside the heat exchange tubes, thus avoiding blockage of the hot air side flow channel of the heat exchanger and the increase in thermal resistance due to ash accumulation on the heat exchange surface, which leads to a decrease in heat exchange efficiency. It also avoids the problem of the heat exchanger's service life being affected by slag particle collision and abrasion. Therefore, the high-temperature slag waste heat recovery device of the present invention solves the technical problems of poor low-temperature waste heat recovery effect of slag when using cold air direct contact heat exchange, which easily leads to blockage of the hot air side flow channel of the heat exchanger and an increase in thermal resistance due to ash accumulation on the heat exchange surface, resulting in a decrease in heat exchange efficiency and an impact on the service life of the heat exchanger due to slag particle collision and abrasion, and the technical problems of poor low-temperature waste heat recovery effect of slag when using molten salt indirect heat exchange. The high-temperature slag waste heat recovery device of the present invention has a large heat exchange area and can quickly cool high-temperature slag to a lower temperature.

[0027] (2) In this invention, the heat exchange tube has an inner and outer tube structure, which is simple in form and easy to inspect and replace; in addition, during installation, one end of the heat exchange tube is fixed and the other end can expand freely, ensuring that the heat exchange tube operates safely and stably under large temperature difference. Attached Figure Description

[0028] Figure 1 This is an external view of an embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of the internal structure of an embodiment of the present invention;

[0030] Figure 3 This is a schematic diagram of the heat exchange tube structure in an embodiment of the present invention;

[0031] Figure 4 It is along Figure 3 Sectional view of line AA in the middle;

[0032] Figure 5 It is along Figure 2 Cross-sectional view of the middle BB line;

[0033] Figure 6 It is along Figure 2 Cross-sectional view of the CC line (the inner tube is not shown in the figure);

[0034] Figure 7 yes Figure 2 A magnified view of a section at point I;

[0035] Figure 8 yes Figure 2 Enlarged view of a section at point II;

[0036] Figure 9 This is a schematic diagram of the structure of the coiled tube coiled inside the side wall of the cylinder in an embodiment of the present invention;

[0037] Figure 10 This is a schematic diagram of the inner tube support plate in an embodiment of the present invention;

[0038] Figure 11 This is a schematic diagram of the structure of the outer tube support plate in an embodiment of the present invention.

[0039] The labels in the diagram are explained as follows:

[0040] 1-Cold air inlet, 2-Hot air outlet, 3-Slag inlet, 4-Cylinder body, 5-Water outlet, 6-Slag outlet, 7-Water inlet, 8-Guide plate, 9-Inner tube support plate, 10-Outer tube support plate, 11-Heat exchange tube, 12-Coiled tube, 111-Air inlet, 112-Air outlet, 113-Outer tube, 114-Inner tube, 91-Inner tube limiting through hole, 101-Outer tube limiting through hole. Detailed Implementation

[0041] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0042] See Figure 1 and Figure 2 This invention discloses a high-temperature slag waste heat recovery device, comprising a cylindrical body 4, a heat exchange tube assembly disposed in the upper part of the inner cavity of the cylindrical body 4, and a coiled tube assembly disposed in the lower part of the inner cavity of the cylindrical body 4. A cold air inlet 1 is provided at the top of the cylindrical body 4; a slag outlet 6 is provided at the bottom of the cylindrical body 4; and a hot air outlet 2, a slag inlet 3, a water outlet 5, and a water inlet 7 are sequentially arranged on the side wall of the cylindrical body 4 from top to bottom; see also... Figure 3 and Figure 4 The aforementioned heat exchange tube assembly is equipped with an air inlet 111 and an air outlet 112. Cold air enters the inner cavity of the cylinder 4 through the cold air inlet 1, then enters the heat exchange tube assembly through the air inlet 111. After exchanging heat with the high-temperature slag outside the heat exchange tube assembly, the hot air flows out of the heat exchange tube assembly through the air outlet 112, and then flows out of the cylinder 4 through the hot air outlet 2. In this way, for the high-temperature zone at the top of the device, the high-temperature waste heat of the high-temperature slag is recovered through the aforementioned heat exchange tube assembly. At this time, air, which has zero cost and a wide temperature range, is used as the heat exchange medium to recover the sensible waste heat of the high-temperature slag. See also... Figure 2 , Figure 8 and Figure 9 The aforementioned coiled tube assembly includes a coiled tube 12. The coiled tube 12 is spirally coiled on the inner wall of the cylinder 4 located between the inlet 7 and the outlet 5. Cold water enters the coiled tube 12 from the inlet 7, exchanges heat with the slag cooled by the heat exchange tube assembly outside the coiled tube 12, and then exits from the outlet 5. In this way, for the low-temperature zone at the bottom of the device, the coiled tube assembly recovers the low-temperature waste heat of the slag cooled by the heat exchange tube assembly. Water, with its high heat exchange intensity, is used as the heat exchange medium to cool the low-temperature slag to a lower temperature (<100℃). High-temperature slag enters the inner cavity of the cylinder 4 from the slag inlet 3, exchanges heat sequentially through the heat exchange tube assembly and the coiled tube assembly, and then exits from the slag outlet 6. This reasonable coupling of the two heat exchange media expands the temperature range for recovering waste heat from the slag and enables maximum recovery of waste heat from high-temperature slag.

[0043] See Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 10 and Figure 11The aforementioned heat exchange tube assembly includes at least one set of heat exchange tubes 11, an inner tube support plate 9, and an outer tube support plate 10. Each set of heat exchange tubes 11 includes an outer tube 113 and an inner tube 114 fitted from the outside in. The lower end of the outer tube 113 is closed, and the upper end is open. Both ends of the inner tube 114 are open, and the inner tube 114 extends from the upper opening of the outer tube 113. The inner tube support plate 9 and the outer tube support plate 10 are both arranged perpendicular to the axis of the cylinder 4. The inner tube support plate 9 is located above the hot air outlet 2. The outer tube support plate 10 is located between the hot air outlet 2 and the slag inlet 3. All support plates 10 are sealed and fixed to the inner wall of the cylinder 4. The inner tube support plate 9 is vertically provided with an equal number of inner tube limiting through holes 91 as the number of heat exchange tubes 11. The diameter of the inner tube limiting through holes 91 is adapted to the outer diameter of the inner tube 114. The outer tube support plate 10 is provided with an outer tube limiting through hole 101 at a position coaxial with the axis of each inner tube limiting through hole 91. The diameter of the outer tube limiting through hole 101 is adapted to the outer diameter of the outer tube 113. In the same group of heat exchange tubes 11, the inner tube 114 is sealed and connected to the coaxial inner tube limiting through hole 91, and the outer tube 113 is sealed and connected to the coaxial outer tube limiting through hole 101. With this installation, one end of both the inner tube 114 and the outer tube 113 in the heat exchange tube 11 is fixed, while the other end can expand freely, ensuring safe and stable operation of the heat exchange tubes under large temperature differences. The heat exchange tube assembly of this embodiment isolates the air heat exchange medium from the slag, preventing fine slag particles from entering the hot air.

[0044] See Figure 2 The high-temperature slag waste heat recovery device of this embodiment preferably further includes multiple guide plates 8; there are multiple sets of heat exchange tubes 11, and the multiple sets of heat exchange tubes 11 are evenly arranged in the inner cavity of the cylinder 4; the multiple guide plates 8 are all arranged in the inner cavity of the cylinder 4, and are all located between the cold air inlet 1 and the inner tube support plate 9. The plate surface of the guide plate 8 is coplanar with the longitudinal section of the cylinder 4 through its own axis, and the multiple guide plates 8 are evenly arranged around the circumference of the cylinder 4. The guide plates 8 can evenly distribute the cold air to each heat exchange tube 11, so as to improve the heat exchange effect; at the same time, the multiple sets of heat exchange tubes 11 also improve the heat exchange effect.

[0045] The outer tube 113 and inner tube 114 are preferably smooth round tubes, internally threaded tubes, or internally finned tubes. This can enhance air-side heat exchange.

[0046] See Figure 3 and Figure 7 In order to facilitate the installation of the outer tube 113 and the inner tube 114, in this embodiment, a shoulder is preferably provided on the outer side of the upper end of both the outer tube 113 and the inner tube 114.

[0047] See Figure 2To improve the secondary heat exchange effect of the slag after it has been cooled by the heat exchange tube assembly, and to ensure smooth slag discharge, there are at least two slag outlets 6. Each slag outlet 6 corresponds to a water inlet 7, a water outlet 5, and a set of coiled tube assemblies. The inner cavity shape of the cylinder 4 corresponding to each slag outlet 6 is "Y". In this embodiment, there are two slag outlets 6.

[0048] To improve heat exchange efficiency, there are multiple hot air outlets 2, evenly distributed along the circumference of the cylinder body. Similarly, there are multiple slag inlets 3, also evenly distributed along the circumference of the cylinder body. (See also...) Figure 5 and Figure 6 In this embodiment, there are four hot air outlets 2 and four slag inlets 3.

[0049] When the high-temperature slag waste heat recovery device of the present invention is used for waste heat recovery, its working process is as follows: the small-sized high-temperature slag after being granulated by the granulator enters the inside of the cylinder 4 from the circumferential slag inlet 3 of the waste heat recovery device. During the process of the high-temperature slag descending through the gap of the heat exchange tube 11, the heat of the high-temperature slag is transferred to the outer tube 113. The inner tube 114 is heated to a higher temperature by the radiation heat transfer of the outer tube 113. At this time, cold air enters the inside of the cylinder 4 from the cold air inlet 1 at the top of the cylinder 4. The airflow is evenly distributed to each heat exchange tube 11 by the guide plate 8. The cold air enters from the air inlet 111 of the inner tube 114 and flows out from the air outlet 112 of the outer tube 113. During this process, the cold air is heated and the high-temperature slag is cooled. The heated hot air is finally discharged from the hot air outlet 2 at the top of the device to the heat-using end.

[0050] After being cooled by the upper heat exchange tube 11, the slag continues to fall to the bottom of the device under gravity, where it continues to exchange heat with the coiled tube 12. Low-temperature cold water enters the coiled tube 12 through the inlet 7, absorbs the heat transferred from the slag, and is then heated before being discharged from the upper outlet 5. During this process, the slag is cooled to a lower temperature and is finally discharged from the slag outlet 6.

[0051] The high-temperature slag waste heat recovery device of the present invention has a large heat exchange area and can quickly cool high-temperature slag to a lower temperature.

Claims

1. A high-temperature slag waste heat recovery device, characterized in that: It includes a cylinder (4), a heat exchange tube assembly disposed in the upper part of the inner cavity of the cylinder (4), and a coiled tube assembly disposed in the lower part of the inner cavity of the cylinder (4); The top of the cylinder (4) is provided with a cold air inlet (1); the bottom of the cylinder (4) is provided with a slag outlet (6); the side wall of the cylinder (4) is provided with a hot air outlet (2), a slag inlet (3), a water outlet (5) and a water inlet (7) from top to bottom. The heat exchange tube assembly is provided with an air inlet (111) and an air outlet (112); after cold air enters the inner cavity of the cylinder (4) from the cold air inlet (1), it enters the heat exchange tube assembly from the air inlet (111), and after exchanging heat with the high-temperature slag outside the heat exchange tube assembly, the hot air flows out of the heat exchange tube assembly from the air outlet (112), and then flows to the outside of the cylinder (4) from the hot air outlet (2); The coiled tube assembly includes a coiled tube (12); the coiled tube (12) is spirally coiled on the inner wall of the cylinder (4) located between the inlet (7) and the outlet (5); cold water enters the coiled tube (12) from the inlet (7), exchanges heat with the slag outside the coiled tube (12) after it has been cooled by the heat exchange tube assembly, and then is discharged from the outlet (5); High-temperature slag enters the inner cavity of the cylinder (4) from the slag inlet (3), and after heat exchange through the heat exchange tube assembly and the coiled tube assembly, it is discharged from the slag outlet (6). The heat exchange tube assembly includes at least one set of heat exchange tubes (11), an inner tube support plate (9), and an outer tube support plate (10). Each heat exchange tube (11) includes an outer tube (113) and an inner tube (114) fitted from the outside in; the lower end of the outer tube (113) is closed and the upper end is open; both ends of the inner tube (114) are open and the inner tube (114) extends from the upper end opening of the outer tube (113); The inner tube support plate (9) and the outer tube support plate (10) are both arranged perpendicular to the axis of the cylinder (4); the inner tube support plate (9) is located above the hot air outlet (2); the outer tube support plate (10) is located between the hot air outlet (2) and the slag inlet (3); the inner tube support plate (9) and the outer tube support plate (10) are both sealed and fixed to the inner wall of the cylinder (4). The inner tube support plate (9) is vertically provided with an inner tube limiting through hole (91) equal in number to the number of heat exchange tubes (11); the diameter of the inner tube limiting through hole (91) is adapted to the outer diameter of the inner tube (114); the outer tube support plate (10) is provided with an outer tube limiting through hole (101) at a position coaxial with the axis of each inner tube limiting through hole (91); the diameter of the outer tube limiting through hole (101) is adapted to the outer diameter of the outer tube (113); in the same group of heat exchange tubes (11), the inner tube (114) is sealed to the inner tube limiting through hole (91) on the same axis, and the outer tube (113) is sealed to the outer tube limiting through hole (101) on the same axis.

2. The high-temperature slag waste heat recovery device according to claim 1, characterized in that: It also includes multiple deflectors (8); There are multiple sets of heat exchange tubes (11), and the multiple sets of heat exchange tubes (11) are evenly arranged in the inner cavity of the cylinder (4); Multiple guide plates (8) are all arranged inside the inner cavity of the cylinder (4) and are located between the cold air inlet (1) and the inner tube support plate (9). The surface of the guide plate (8) is coplanar with the longitudinal section of the cylinder (4) through its own axis. Multiple guide plates (8) are evenly arranged around the circumference of the cylinder (4).

3. The high-temperature slag waste heat recovery device according to claim 1 or 2, characterized in that: The outer tube (113) and inner tube (114) are smooth round tubes, internally threaded tubes, or internally finned tubes.

4. The high-temperature slag waste heat recovery device according to claim 3, characterized in that: Both the outer tube (113) and the inner tube (114) have shoulders on their upper outer sides.

5. The high-temperature slag waste heat recovery device according to claim 1 or 2, characterized in that: There are at least two slag outlets (6); each slag outlet (6) corresponds to a water inlet (7), a water outlet (5), and a set of coiled pipe assemblies; The inner cavity shape of the cylinder (4) corresponding to each of the slag outlets (6) is "Y".

6. The high-temperature slag waste heat recovery device according to claim 1, characterized in that: There are multiple hot air outlets (2), and the multiple hot air outlets (2) are evenly distributed along the circumference of the cylinder (4).

7. The high-temperature slag waste heat recovery device according to claim 1, characterized in that: There are multiple slag inlets (3), and the multiple slag inlets (3) are evenly distributed along the circumference of the cylinder (4).

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