A method for recycling waste heat from slag and a slag discharge device

Abstract

The present invention discloses a method for recycling waste heat of slag and a slag discharge device, which comprises the following steps: S100, the slag settles into a bucket; S200, the slag is gradually cooled down in the process of contacting a high-temperature pipe body, a medium-temperature pipe body and the outer wall of a low-temperature pipe body in sequence; S300, the room temperature wind gradually heats up when passing through the low-temperature pipe body, the medium-temperature pipe body and the high-temperature pipe body to form circulating hot air; S400, the circulating hot air flows into the combustion chamber through the furnace bottom blower. It comprises a combustion chamber, a blast chamber, a settling chamber, and a slag discharge bucket, and the slag discharge bucket is connected to the blast chamber through the furnace bottom blower; the slag discharge bucket comprises a bucket body and a slag discharge port, and the bucket body is connected to the settling chamber, and a plurality of mutually connected heat exchange pipes are arranged in the bucket body, and the heat exchange pipes are connected to a first blower and a furnace bottom blower. The invention realizes cooling of high-temperature slag in the slag discharge bucket, prolongs the service life of the slag discharge bucket, and the cold air enters the furnace bottom blower again after heating up, so as to achieve the purpose of recycling waste heat of slag.

Description

Technical Field

[0001] The invention relates to the technical field of waste heat recovery, and in particular to a method for recovering waste heat from slag and a slag discharge device. Background Art

[0002] In the gypsum board industry, the fluidized bed furnace provides heat source for frying gypsum powder and drying gypsum boards. The structure of the fluidized bed furnace is mainly divided into a combustion chamber, a blast chamber, a settling chamber, and a slag hopper. A blower is installed under the wind chamber to increase fresh air for the wind chamber. The fresh air enters the combustion chamber through the air distribution plate. After being heated, the fresh air makes the base material in the combustion chamber boil and fully mixes the coal powder with the air to ensure the complete combustion of the coal powder. Under the action of the induced draft fan, the hot flue gas containing slag particles enters the settling chamber. Because the settling chamber is large and the wind speed is reduced, most of the slag will be deposited in the settling chamber and finally discharged from the slag hopper.

[0003] However, in the actual production process, the slag still has a relatively high temperature when passing through the slag hopper. If the slag is discharged directly, it will not only waste a lot of heat energy, increase the external temperature of the device and reduce the quality of the production environment, but also burn and deform the slag hopper, affecting the service life of the device. Summary of the invention

[0004] The object of the present invention is to provide a method for recovering and utilizing waste heat from slag and a slag discharge device, so as to solve the technical problems in the prior art that the slag bucket is easily damaged due to the excessively high slag temperature and a large amount of slag heat energy is lost.

[0005] In order to solve the above technical problems, the present invention specifically provides the following technical solutions:

[0006] The present invention provides a method for recycling slag waste heat, comprising the following steps:

[0007] S100, the furnace bottom blower introduces high temperature gas into the blast chamber, the high temperature gas flows through the combustion chamber and drives the materials in the combustion chamber to burn, the materials burn out to form hot air and slag, the hot air expands and drives the slag into the settling chamber, and the slag settles into the hopper;

[0008] S200, after entering the hopper, the slag passes through the high-temperature chamber, the medium-temperature chamber and the low-temperature chamber from top to bottom in sequence, and the slag gradually cools down in the process of contacting the high-temperature tube body, the medium-temperature tube body and the outer wall of the low-temperature tube body in sequence, and finally flows out from the slag discharge port;

[0009] S300, the first blower continuously blows room temperature air into the fourth air chamber, and the room temperature air flows through the low temperature pipe body, the third air chamber, the medium temperature pipe body, the second air chamber, the high temperature pipe body and the first air chamber in sequence;

[0010] Among them, the room temperature air gradually heats up when passing through the low temperature pipe body, the medium temperature pipe body and the high temperature pipe body, forming circulating hot air;

[0011] S400, the circulating hot air flows into the combustion chamber through the furnace bottom blower to realize the recovery and utilization of the slag waste heat.

[0012] As a preferred solution of the present invention, in step S200, it also includes:

[0013] S201. During the falling process of the slag, the driving gear is opened, the driving gear drives the driven gear to rotate, and the high-temperature tube body, the medium-temperature tube body and the low-temperature tube body rotate in the bucket body, driving the slag to fall.

[0014] The present invention provides a slag discharge device for recycling slag waste heat, comprising a combustion chamber and a blast chamber installed at the bottom of the combustion chamber, the blast chamber is connected to a settling chamber on the side, a slag discharge hopper is arranged at the bottom of the settling chamber, and the slag discharge hopper is connected to the blast chamber through a furnace bottom blower;

[0015] The slag discharge hopper includes a hopper body and a slag discharge port installed at the bottom of the hopper body. The top of the hopper body is connected to the sedimentation chamber. A plurality of mutually parallel heat exchange tubes are horizontally arranged in the hopper body. The plurality of heat exchange tubes are connected to each other. The heat exchange tubes located at the lower end of the hopper body are connected to the first blower, and the heat exchange tubes located at the upper end of the hopper body are connected to the furnace bottom blower.

[0016] As a preferred solution of the present invention, the interior of the bucket is sequentially provided with a high-temperature chamber, a medium-temperature chamber and a low-temperature chamber which are interconnected from top to bottom, and a plurality of heat exchange tubes are respectively arranged in the high-temperature chamber, the medium-temperature chamber and the low-temperature chamber, the top of the high-temperature chamber is connected to the settling chamber, the side of the high-temperature chamber is connected to the furnace bottom blower, the bottom of the low-temperature chamber is connected to the slag discharge port, and the side of the low-temperature chamber is connected to the first blower;

[0017] The wind flowing out from the first blower passes through the low-temperature chamber, the medium-temperature chamber and the high-temperature chamber in sequence and finally flows into the blast chamber from the furnace bottom blower.

[0018] As a preferred embodiment of the present invention, the high temperature chamber, the medium temperature chamber and the low temperature chamber are arranged parallel to each other, and the wind in the heat exchange tube flows through the low temperature chamber, the medium temperature chamber and the high temperature chamber in an S shape.

[0019] As a preferred embodiment of the present invention, the heat exchange tubes include a plurality of high-temperature tubes arranged in the high-temperature chamber, a plurality of medium-temperature tubes arranged in the medium-temperature chamber, and a plurality of low-temperature tubes arranged in the low-temperature chamber. The high-temperature tubes in adjacent layers, the medium-temperature tubes in adjacent layers, and the low-temperature tubes in adjacent layers are all arranged in staggered layers.

[0020] As a preferred solution of the present invention, a first wind chamber and a third wind chamber are provided on one side of the bucket body, a second wind chamber and a fourth wind chamber are provided on the other side of the bucket body, the furnace bottom blower is connected to the high-temperature pipe body through the first wind chamber, and the low-temperature pipe body is connected to the first blower through the fourth wind chamber;

[0021] The first air chamber is communicated with the second air chamber through a high-temperature pipe body, the second air chamber is communicated with the third air chamber through a medium-temperature pipe body, and the third air chamber is communicated with the fourth air chamber through a low-temperature pipe body.

[0022] As a preferred solution of the present invention, the ends of the high-temperature tube body, the medium-temperature tube body and the low-temperature tube body are all provided with a rotating mechanism, and the rotating mechanism drives the high-temperature tube body, the medium-temperature tube body and the low-temperature tube body to rotate in the bucket body.

[0023] As a preferred solution of the present invention, the rotating mechanism includes driven gears respectively installed at the ends of the high-temperature tube body, the medium-temperature tube body and the low-temperature tube body, and a driving gear installed on the side of the bucket body, each adjacent driven gear is meshed together, the driving gear is meshed with the nearest driven gear, and the driving gear is connected to a rotating drive motor. When the output shaft of the rotating drive motor rotates, the driven gear rotates and drives the high-temperature tube body, the medium-temperature tube body and the low-temperature tube body to rotate.

[0024] As a preferred solution of the present invention, the outer walls of the high-temperature tube body, the medium-temperature tube body and the low-temperature tube body are all provided with outwardly protruding ridges.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The present invention places a plurality of heat exchange tubes in the slag bucket, and the heat exchange tubes cool down the high-temperature slag step by step, thereby extending the service life of the slag bucket;

[0027] 2. The present invention connects the furnace bottom blower that provides heat for combustion to the heat exchange pipe, and the heat exchange pipe is connected to the blower that provides room temperature air. After the air is heated, it enters the furnace bottom blower again to increase the furnace blast temperature, thereby achieving the purpose of slag waste heat recovery and utilization;

[0028] 3. The slag hopper of the present invention is provided with multiple heat exchange layers, and each heat exchange layer is provided with staggered heat exchange tubes, which is beneficial to prevent slag accumulation, increase the heat exchange area between the slag and the tube wall, and improve the efficiency of the heat absorption device. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0030] Figure 1 A schematic flow chart of a method for recovering waste heat from slag provided by the present invention;

[0031] Figure 2 A schematic structural diagram of a slag discharge device for recovering waste heat from slag provided in the present invention;

[0032] Figure 3 A structural schematic diagram of a slag hopper is provided for the present invention;

[0033] Figure 4 A schematic diagram of the side structure of a high-temperature pipe body is provided for the present invention;

[0034] Figure 5 A side structural schematic diagram of a furnace rotating mechanism is provided for the present invention.

[0035] The numbers in the figure represent the following:

[0036] 1-combustion chamber; 2-blast chamber; 3-sedimentation chamber; 4-slag hopper; 5-furnace bottom blower; 6-gypsum drying kiln; 7-second blower; 8-heat exchanger; 9-gypsum board drying kiln; 10-third blower; 11-fourth blower; 12-high temperature chamber; 13-medium temperature chamber; 14-low temperature chamber; 15-first air chamber; 16-third air chamber; 17-second air chamber; 18-fourth air chamber; 19-rotating mechanism; 20-ridged teeth;

[0037] 401- bucket body; 402- heat exchange tube; 403- slag outlet; 404- first blower;

[0038] 4021-High temperature pipe body; 4022-Medium temperature pipe body; 4023-Low temperature pipe body;

[0039] 1901-driving gear; 1902-driven gear; 1903-rotation drive motor. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] like Figure 1 As shown, the present invention provides a method for recycling slag waste heat, which is characterized by comprising the following steps:

[0042] S100, the furnace bottom blower introduces high temperature gas into the blast chamber, the high temperature gas flows through the combustion chamber and drives the materials in the combustion chamber to burn, the materials burn out to form hot air and slag, the hot air expands and drives the slag into the settling chamber, and the slag settles into the hopper;

[0043] S200, after entering the hopper, the slag passes through the high-temperature chamber, the medium-temperature chamber and the low-temperature chamber from top to bottom in sequence, and the slag gradually cools down in the process of contacting the high-temperature tube body, the medium-temperature tube body and the outer wall of the low-temperature tube body in sequence, and finally flows out from the slag discharge port;

[0044] S300, the first blower continuously blows room temperature air into the fourth air chamber, and the room temperature air flows through the low temperature pipe body, the third air chamber, the medium temperature pipe body, the second air chamber, the high temperature pipe body and the first air chamber in sequence;

[0045] Among them, the room temperature air gradually heats up when passing through the low temperature pipe body, the medium temperature pipe body and the high temperature pipe body, forming circulating hot air;

[0046] S400, the circulating hot air flows into the combustion chamber through the furnace bottom blower to realize the recovery and utilization of the slag waste heat.

[0047] In this embodiment, the high-temperature slag flows from the end of the bucket 401 to the bottom of the bucket 401 under the action of gravity, and finally flows out from the slag discharge port 403. In this process, the slag passes through the low-temperature tube 4023, the medium-temperature tube 4022 and the high-temperature tube 4021 from top to bottom. There is air circulation in these tubes, and the temperature of the air is lower than the temperature of the slag. Therefore, when the slag contacts the outer wall of the tube during the flow, the heat will be sent into the air flowing in the tube, thereby achieving the purpose of cooling the slag.

[0048] As the air in the tube body is in continuous contact with the slag, its temperature gradually increases. The gas in the high-temperature tube body 4021 absorbs the highest amount of heat, and the gas in the low-temperature tube body 4023 absorbs the lowest amount of heat. However, on the basis of small heat loss, the overall temperature of the low-temperature tube body 4023 is still higher than the temperature of the gas in the high-temperature tube body 4021. Finally, the temperature in the low-temperature tube body 4023 is heated to a relatively high level and is blown into the combustion chamber 1 from the first wind chamber 15 by the furnace bottom blower 5, thereby participating in the heat supplement of the combustion chamber 1.

[0049] In order to prevent slag from accumulating on the tube body, step S200 further includes:

[0050] S201. During the falling process of the slag, the driving gear is opened, the driving gear drives the driven gear to rotate, and the high-temperature tube body, the medium-temperature tube body and the low-temperature tube body rotate in the bucket body, driving the slag to fall.

[0051] like Figures 2 to 5 As shown, the present invention provides a slag discharge device for recovering slag waste heat, characterized in that it includes a combustion chamber 1 and a blast chamber 2 installed at the bottom of the combustion chamber 1, the blast chamber 2 is connected to a settling chamber 3 on the side, a slag discharge hopper 4 is arranged at the bottom of the settling chamber 3, the slag discharge hopper 4 is connected to the blast chamber 2 through a furnace bottom blower 5, an air distribution plate is arranged between the blast chamber 2 and the combustion chamber 1, the air distribution plate can heat the temperature, and the air distribution plate is not marked in the figure.

[0052] A gypsum drying kiln 6 for drying gypsum is arranged above the settling chamber 3. The gypsum drying kiln 6 is connected to a second blower 7. The second blower 7 is used to draw hot air in the settling chamber 3 into the gypsum drying kiln 6 to dry the gypsum board.

[0053] The side of the settling chamber 3 is connected to a heat exchanger 8, and the upper and lower ends of the heat exchanger 8 are connected to a gypsum board drying kiln 9 through pipes. On one of the pipes, a third blower 10 for driving air flow is installed between the heat exchanger 8 and the gypsum board drying kiln 9. The third blower 10 drives the moist hot air flowing into the gypsum board drying kiln 9 to flow back to the heat exchanger 8 to form convection. A fourth blower 11 is arranged on the side of the heat exchanger 8, and the fourth blower 11 discharges the moist hot air flowing out of the third blower 10 from the heat exchanger 8.

[0054] The slag hopper 4 includes a hopper body 401 and a slag discharge port 403 installed at the bottom of the hopper body 401. The top of the hopper body 401 is connected to the sedimentation chamber 3. A plurality of mutually parallel heat exchange tubes 402 are horizontally arranged in the hopper body 401. The plurality of heat exchange tubes 402 are connected to each other. The heat exchange tubes 402 located at the lower end of the hopper body 401 are connected to the furnace bottom blower 5, and the heat exchange tubes 402 located at the upper end of the hopper body 401 are connected to the first blower 404.

[0055] In this embodiment, a large number of heat exchange tubes 402 are arranged in the bucket 401. Under the condition that the slag will not be blocked between the heat exchange tubes 402, the distance between the heat exchange tubes 402 is minimized to increase the heat exchange area. Through the first blower 404, the cold air enters the heat exchange tubes 402 at the lower part of the bucket 401 for a primary heat exchange, and then passes through the heat exchange tubes 402 at the medium temperature section of the bucket 401 for a secondary heat exchange, and finally passes through the heat exchange tubes 402 at the upper high temperature section of the bucket 401 for a tertiary heat exchange. After multiple heat exchanges, the heated fresh air enters the blast chamber 2 under the action of the first blower 404 and the furnace bottom blower 5. At this time, the temperature of the discharged slag is greatly reduced, and most of the heat it carries can be recycled.

[0056] In this embodiment, the interior of the bucket 401 is provided with a low-temperature chamber 14, a medium-temperature chamber 13 and a high-temperature chamber 12 which are interconnected from top to bottom, and a plurality of heat exchange tubes 402 are respectively arranged in the low-temperature chamber 14, the medium-temperature chamber 13 and the high-temperature chamber 12. The top of the low-temperature chamber 14 is connected to the sedimentation chamber 3, the side of the low-temperature chamber 14 is connected to the first blower 404, the bottom of the high-temperature chamber 12 is connected to the slag discharge port 403, and the side of the high-temperature chamber 12 is connected to the furnace bottom blower 5.

[0057] The wind flowing out from the first blower 404 passes through the low-temperature chamber 14 , the medium-temperature chamber 13 , and the high-temperature chamber 12 in sequence and finally flows into the blast chamber 2 from the furnace bottom blower 5 .

[0058] In this embodiment, the low temperature chamber 14 , the medium temperature chamber 13 and the high temperature chamber 12 are arranged parallel to each other, and the wind in the heat exchange tube 402 flows through the low temperature chamber 14 , the medium temperature chamber 13 and the high temperature chamber 12 in an S shape.

[0059] In this embodiment, the heat exchange tube 402 includes a plurality of high-temperature tube bodies 4021 arranged in the low-temperature chamber 14, a plurality of medium-temperature tube bodies 4022 arranged in the medium-temperature chamber 13, and a plurality of low-temperature tube bodies 4023 arranged in the high-temperature chamber 12. The high-temperature tube bodies 4021 of adjacent layers, the medium-temperature tube bodies 4022 of adjacent layers, and the low-temperature tube bodies 4023 of adjacent layers are all arranged in staggered layers.

[0060] The high temperature tube 4021, the medium temperature tube 4022 and the low temperature tube 4023 can be connected end to end in the bucket 401, and both ends can also pass through the bucket 401 to ensure that each high temperature tube 4021, the medium temperature tube 4022 and the low temperature tube 4023 are not connected to the outside.

[0061] In this embodiment, preferably, a first wind chamber 15 and a third wind chamber 16 are provided on one side of the bucket body 401, and a second wind chamber 17 and a fourth wind chamber 18 are provided on the other side of the bucket body 401. The furnace bottom blower 5 is connected to the high-temperature pipe body 4021 through the first wind chamber 15, and the low-temperature pipe body 4023 is connected to the first blower 404 through the fourth wind chamber 18.

[0062] The first air chamber 15 is connected to the second air chamber 17 through the high-temperature pipe body 4021 , the second air chamber 17 is connected to the third air chamber 16 through the medium-temperature pipe body 4022 , and the third air chamber 16 is connected to the fourth air chamber 18 through the low-temperature pipe body 4023 .

[0063] After the first blower 404 blows the cold air into the fourth air chamber 18, the wind in the fourth air chamber 18 enters into all the low-temperature tubes 4023, and passes through the other end of the low-temperature tube 4023 after one heat exchange, and enters the third air chamber 16. The wind in the third air chamber 16 enters from one end of the medium-temperature tube 4022, undergoes a second heat exchange, and passes through the other end of the medium-temperature tube 4022 to enter the second air chamber 17. The wind in the second air chamber 17 enters from one end of the high-temperature tube 4021, undergoes a third heat exchange, and passes through the other end of the high-temperature tube 4021 to enter the first air chamber 15. The wind in the first air chamber 15 forms circulating hot air after three heat exchanges, and the circulating hot air enters the blast chamber 2 driven by the furnace bottom blower 5.

[0064] The wind chamber facilitates the connection between the pipe bodies, reduces the difficulty of manufacturing the invention during production, and helps reduce the loss of wind speed and heat.

[0065] In this embodiment, in order to prevent the slag from falling, a rotating mechanism 19 is provided at the ends of the high-temperature tube body 4021, the medium-temperature tube body 4022 and the low-temperature tube body 4023, and the rotating mechanism 19 drives the high-temperature tube body 4021, the medium-temperature tube body 4022 and the low-temperature tube body 4023 to rotate in the bucket body 401.

[0066] Specifically, the rotating mechanism 19 includes driven gears 1902 respectively installed at the ends of the high-temperature tube body 4021, the medium-temperature tube body 4022 and the low-temperature tube body 4023, and a driving gear 1901 installed on the side of the bucket body 401. Each adjacent driven gear 1902 is meshed together, and the driving gear 1901 is meshed with the nearest driven gear 1902. The driving gear 1901 is connected to a rotating drive motor 1903. When the output shaft of the rotating drive motor 1903 rotates, the driven gear 1902 rotates and drives the high-temperature tube body 4021, the medium-temperature tube body 4022 and the low-temperature tube body 4023 to rotate.

[0067] When slag accumulates on the tube body, the tube body shakes off the slag by continuous rotation to prevent the slag from clogging the bucket body 401.

[0068] Preferably, in order to further absorb the temperature of the slag, the outer walls of the high temperature tube 4021, the medium temperature tube 4022 and the low temperature tube 4023 are all provided with outwardly protruding ridge teeth 20. The ridge teeth 20 have a certain flow blocking effect on the slag, preventing the slag from falling too fast.

[0069] Through the slag waste heat recovery method and slag discharge device of this embodiment, the high-temperature slag can be cooled in the slag bucket, thereby extending the service life of the slag bucket. The cold air is heated and then enters the furnace bottom blower again to increase the furnace blast temperature, thereby achieving the purpose of slag waste heat recovery.

[0070] The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and protection scope of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present application.

Claims

1. A slag discharge device for recovering slag waste heat, characterized in that: It comprises a combustion chamber (1) and a blast chamber (2) installed at the bottom of the combustion chamber (1); the blast chamber (2) is connected to a settling chamber (3) on its side; a slag hopper (4) is provided at the bottom of the settling chamber (3); the slag hopper (4) is connected to the blast chamber (2) via a furnace bottom blower (5); The slag discharge hopper (4) comprises a hopper body (401) and a slag discharge port (403) installed at the bottom of the hopper body (401); the top of the hopper body (401) is connected to the sedimentation chamber (3); a plurality of mutually parallel heat exchange tubes (402) are transversely arranged in the hopper body (401); the plurality of heat exchange tubes (402) are connected to each other; the heat exchange tubes (402) located at the lower end of the hopper body (401) are connected to a first blower (404); and the heat exchange tubes (402) located at the upper end of the hopper body (401) are connected to the furnace bottom blower (5); The interior of the bucket (401) is provided with a high-temperature chamber (12), a medium-temperature chamber (13) and a low-temperature chamber (14) which are interconnected from top to bottom. A plurality of heat exchange tubes (402) are respectively arranged in the high-temperature chamber (12), the medium-temperature chamber (13) and the low-temperature chamber (14). The top of the high-temperature chamber (12) is connected to the settling chamber (3), the side of the high-temperature chamber (12) is connected to the furnace bottom blower (5), the bottom of the low-temperature chamber (14) is connected to the slag discharge port (403), and the side of the low-temperature chamber (14) is connected to the first blower (404); The wind flowing out of the first blower (404) passes through the low-temperature chamber (14), the medium-temperature chamber (13), and the high-temperature chamber (12) in sequence and finally flows into the blast chamber (2) from the furnace bottom blower (5); The high-temperature chamber (12), the medium-temperature chamber (13), and the low-temperature chamber (14) are arranged in parallel with each other, and the wind in the heat exchange tube (402) flows through the low-temperature chamber (14), the medium-temperature chamber (13), and the high-temperature chamber (12) in an S-shape; The heat exchange tubes (402) include a plurality of high-temperature tube bodies (4021) arranged in the high-temperature chamber (12), a plurality of medium-temperature tube bodies (4022) arranged in the medium-temperature chamber (13), and a plurality of low-temperature tube bodies (4023) arranged in the low-temperature chamber (14), wherein the high-temperature tube bodies (4021) of adjacent layers, the medium-temperature tube bodies (4022) of adjacent layers, and the low-temperature tube bodies (4023) of adjacent layers are all arranged in staggered layers; The ends of the high-temperature tube body (4021), the medium-temperature tube body (4022), and the low-temperature tube body (4023) are all provided with a rotating mechanism (19), and the rotating mechanism (19) drives the high-temperature tube body (4021), the medium-temperature tube body (4022), and the low-temperature tube body (4023) to rotate in the bucket body (401); The rotating mechanism (19) comprises driven gears (1902) respectively mounted on the ends of the high-temperature tube body (4021), the medium-temperature tube body (4022) and the low-temperature tube body (4023), and a driving gear (1901) mounted on the side of the bucket body (401), each of the adjacent driven gears (1902) being meshed together, the driving gear (1901) being meshed with the nearest driven gear (1902), the driving gear (1901) being connected to a rotation drive motor (1903), and when the output shaft of the rotation drive motor (1903) is rotated, the driven gear (1902) is rotated and drives the high-temperature tube body (4021), the medium-temperature tube body (4022) and the low-temperature tube body (4023) to rotate; Outwardly protruding ridge teeth (20) are provided on the outer walls of the high-temperature tube body (4021), the medium-temperature tube body (4022) and the low-temperature tube body (4023).

2. A slag discharge device for recovering slag waste heat according to claim 1, characterized in that: A first wind chamber (15) and a third wind chamber (16) are provided on one side of the bucket body (401), and a second wind chamber (17) and a fourth wind chamber (18) are provided on the other side of the bucket body (401); the furnace bottom blower (5) is connected to the high-temperature pipe body (4021) through the first wind chamber (15), and the low-temperature pipe body (4023) is connected to the first blower (404) through the fourth wind chamber (18); The first air chamber (15) is connected to the second air chamber (17) via a high-temperature pipe body (4021), the second air chamber (17) is connected to the third air chamber (16) via a medium-temperature pipe body (4022), and the third air chamber (16) is connected to the fourth air chamber (18) via a low-temperature pipe body (4023).

3. A method for recovering waste heat from slag, applied to the slag discharge device for recovering waste heat from slag as claimed in claim 2, characterized in that: The following steps are involved: S100, the furnace bottom blower introduces high temperature gas into the blast chamber, the high temperature gas flows through the combustion chamber and drives the materials in the combustion chamber to burn, the materials burn out to form hot air and slag, the hot air expands and drives the slag into the settling chamber, and the slag settles into the hopper; S200, after entering the hopper, the slag passes through the high-temperature chamber, the medium-temperature chamber and the low-temperature chamber from top to bottom in sequence, and the slag gradually cools down in the process of contacting the high-temperature tube body, the medium-temperature tube body and the outer wall of the low-temperature tube body in sequence, and finally flows out from the slag discharge port; S300, the first blower continuously blows room temperature air into the fourth air chamber, and the room temperature air flows through the low temperature pipe body, the third air chamber, the medium temperature pipe body, the second air chamber, the high temperature pipe body and the first air chamber in sequence; Among them, the room temperature air gradually heats up when passing through the low temperature pipe body, the medium temperature pipe body and the high temperature pipe body, forming circulating hot air; S400, the circulating hot air flows into the combustion chamber through the furnace bottom blower to realize the recovery and utilization of the slag waste heat.

4. The method for recovering slag waste heat according to claim 3, characterized in that: In step S200, it also includes: S201. During the falling process of the slag, the driving gear is opened, the driving gear drives the driven gear to rotate, and the high-temperature tube body, the medium-temperature tube body and the low-temperature tube body rotate in the bucket body, driving the slag to fall.

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