A waste heat recovery system for a rotary kiln and a rotary kiln

Abstract

The present invention relates to the field of rotary kilns, and specifically to a waste heat recovery system for a rotary kiln and a rotary kiln, including a bottom plate and two support plates mounted on the bottom plate. A rotary kiln body is rotatably connected to the two support plates, and the rotary kiln body is inclined towards one side. For the waste heat recovery system for a rotary kiln and the rotary kiln of the present invention, when the rotary kiln body is no longer rotating and in use, the water to be heated externally is respectively transported to the inside of the first annular placement cavity and the second annular placement cavity through a delivery pipe, a mounting pipe, a second connecting pipe, and a first connecting pipe. At this time, the waste heat generated after the use of the rotary kiln body can heat the water inside the first annular placement cavity and the second annular placement cavity, facilitating the recovery of the waste heat after the use of the rotary kiln body, reducing the heat waste during the use of the rotary kiln body, and facilitating the operation and use of the rotary kiln.

Description

Technical Field

[0001] The present invention relates to the field of rotary kilns, and specifically relates to a waste heat recovery system for a rotary kiln and a rotary kiln. Background Art

[0002] A rotary kiln is a dynamic kiln used for calcining products such as oxidized pellets, metallized pellets, carbon, cement, activated lime, lightly burned dolomite, alumina, etc.

[0003] After the existing rotary kiln is used in operation, the heat generated on the rotary kiln directly dissipates into the air, resulting in waste of heat and inconvenience for the operation and use of the rotary kiln. Utility Model Content

[0004] In view of the problems in the prior art, the present invention provides a waste heat recovery system for a rotary kiln and a rotary kiln.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a waste heat recovery system for a rotary kiln and a rotary kiln, including a bottom plate and two support plates installed on the bottom plate. A rotary kiln body is rotatably connected to the two support plates. The rotary kiln body is inclined towards one side. A driving mechanism for driving the rotation of the rotary kiln body is provided on the support plate. A recovery mechanism for recovering waste heat on the rotary kiln body is provided on the rotary kiln body.

[0006] The recovery mechanism includes a first annular placement cavity and a second annular placement cavity opened inside the rotary kiln body. The second annular placement cavity is arranged closer to the inside of the rotary kiln body than the first annular placement cavity. An installation plate is provided on the inclined side of the rotary kiln body. Two support rods are fixed on the installation plate. The other ends of the two support rods are fixed to the bottom plate. A first connecting pipe and a second connecting pipe are installed on the installation plate. One ends of the first connecting pipe and the second connecting pipe are respectively communicated with the inside of the first annular placement cavity and the second annular placement cavity. The other ends of the first connecting pipe and the second connecting pipe are connected to an installation pipe. A conveying pipe is installed on the installation pipe. A pumping mechanism for pumping and pressing the inside of the second annular placement cavity is provided on the rotary kiln body. A blocking mechanism for blocking the second connecting pipe is provided on the second connecting pipe.

[0007] The pumping and pressing mechanism includes a fixed pipe installed on the rotary kiln body. One end of the fixed pipe is communicated with the inside of the second annular placement cavity. Two one-way valves are installed on the fixed pipe, and the conduction directions of the two one-way valves are from the inside of the second annular placement cavity to the outside of the fixed pipe. An operation pipe is installed on the fixed pipe. A push plate is connected to the fixed pipe through a connection component. A push rod is fixed on the push plate. The other end of the push rod penetrates into the inside of the operation pipe and is fixed with a piston. The piston is slidably connected to the inside of the operation pipe. A transmission mechanism for driving the push plate is provided on the rotary kiln body.

[0008] The connection component includes a plurality of T-shaped rods slidably connected to the push plate. One end of each T-shaped rod is fixed to the fixed pipe, and a first spring is sleeved on the side wall of each T-shaped rod.

[0009] The transmission mechanism includes a plurality of L-shaped push plates fixed on one side of the rotary kiln body. An inclined surface is formed on each L-shaped push plate. An L-shaped transmission plate is fixed on the push plate, and the L-shaped transmission plate is abutted against the inclined surface.

[0010] The blocking mechanism includes an installation box installed on the second connecting pipe. A blocking plate for blocking the inside of the installation box is connected to the installation box through a reset component. A pushing mechanism for pushing the blocking plate is provided on the rotary kiln body.

[0011] The pushing mechanism includes a rotating shaft rotatably connected to the rotary kiln body. An arc-shaped plate is fixed to one end of the blocking plate. A plurality of pushing components for pushing the arc-shaped plate are provided on the outer side wall of the rotating shaft. A rotating mechanism for rotating the rotating shaft is provided on the rotary kiln body.

[0012] The reset component includes strip-shaped plates fixed on both sides of the installation box. A reset rod is slidably connected to the two strip-shaped plates. One end of the reset rod is fixed to one side of the blocking plate, and a second spring is sleeved on the side wall of each reset rod.

[0013] The pushing component includes an installation sleeve rotatably connected to the outer side wall of the rotating shaft. A pushing pin for pushing the arc-shaped plate is slidably connected to the installation sleeve through a reset spring.

[0014] The rotating mechanism includes a first annular rack fixed on the outer side wall of the rotary kiln body. A first gear is fixed on the rotating shaft, and the first gear is meshed with the first annular rack.

[0015] The driving mechanism includes a driving motor installed on the support plate. The output end of the driving motor penetrates through the support plate and is fixed with a second gear. A second annular rack is fixed on the side wall of the rotary kiln body, and the second annular rack is meshed with the second gear.

[0016] Advantages of the present invention:

[0017] (1) For the waste heat recovery system of a rotary kiln and the rotary kiln according to the present invention, during the use of the rotary kiln body, through the mutual transmission between the inclined surfaces on each L-shaped push plate and the L-shaped transmission plate, water and air inside the second annular placement cavity can be continuously sucked between the two one-way valves and discharged from the fixed pipe, making the second annular placement cavity near the inside of the rotary kiln body be evacuated. Through the evacuation treatment of the second annular placement cavity, it is convenient to cut off the temperature transfer between the inside and outside of the rotary kiln body, reduce the heat loss during the use of the rotary kiln body, and facilitate the efficient operation and use of the rotary kiln body.

[0018] (2) For the waste heat recovery system of a rotary kiln and the rotary kiln according to the present invention, when the rotary kiln body is no longer rotating for use, the water to be heated outside is respectively transported to the inside of the first annular placement cavity and the second annular placement cavity through the conveying pipe, the installation pipe, the second connecting pipe and the first connecting pipe. At this time, the waste heat generated after the use of the rotary kiln body can heat the water inside the first annular placement cavity and the second annular placement cavity, which is convenient for recovering the waste heat after the use of the rotary kiln body, reducing the heat waste during the use of the rotary kiln body, and facilitating the operation and use of the rotary kiln. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below in conjunction with the drawings and embodiments.

[0020] Figure 1 It is a schematic diagram of the overall external structure of a waste heat recovery system of a rotary kiln and the rotary kiln provided by the present invention;

[0021] Figure 2 It is a schematic diagram of the recovery mechanism of a waste heat recovery system of a rotary kiln and the rotary kiln provided by the present invention;

[0022] Figure 3 It is a schematic diagram of the pumping and pressing mechanism of a waste heat recovery system of a rotary kiln and the rotary kiln provided by the present invention;

[0023] Figure 4 It is a schematic diagram of the pushing mechanism of a waste heat recovery system of a rotary kiln and the rotary kiln provided by the present invention;

[0024] Figure 5 is Figure 2 the enlarged structural schematic diagram at A in

[0025] Figure 6 is Figure 3 the enlarged structural schematic diagram at B in

[0026] Figure 7 isFigure 4 Schematic diagram of the enlarged structure at position C in the [device / component name];

[0027] Figure 8 is Figure 5 Schematic diagram of the enlarged structure at position D in the [device / component name].

[0028] In the figure: 1, bottom plate; 2, support plate; 3, rotary kiln body; 401, drive motor; 402, second gear; 403, second annular rack; 501, first annular placement cavity; 502, second annular placement cavity; 503, mounting plate; 504, support rod; 505, first connecting pipe; 506, second connecting pipe; 507, mounting pipe; 508, conveying pipe; 601, fixed pipe; 602, one-way valve; 603, operation pipe; 604, push plate; 605, push rod; 701, T-shaped rod; 702, first spring; 801, L-shaped push plate; 802, inclined surface; 803, L-shaped transmission plate; 901, mounting box; 902, plugging plate; 1001, strip plate; 1002, reset rod; 1003, second spring; 1101, rotating shaft; 1102, mounting sleeve; 1103, push pin; 1104, arc plate; 1201, first annular rack; 1202, first gear. Detailed implementation manners

[0029] The following describes the implementation manners of the present invention through specific specific examples. Those skilled in the art can understand the advantages and effects of the present invention from the content disclosed in this specification. It should be noted that the diagrams provided in the following examples are only for illustrative purposes, showing only schematic diagrams, not physical diagrams, and should not be construed as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some components in the diagrams will be omitted, enlarged or reduced, which do not represent the dimensions of the actual products; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the diagrams may be omitted.

[0030] In the diagrams of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the diagrams, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the diagrams are only for illustrative purposes and should not be construed as limitations on the present invention. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0031] Such as Figures 1-8As shown, a waste heat recovery system for a rotary kiln and a rotary kiln of the present invention include a bottom plate 1 and two support plates 2 mounted on the bottom plate 1. A rotary kiln body 3 is rotatably connected between the two support plates 2. The rotary kiln body 3 is inclined towards one side. A driving mechanism for driving the rotation of the rotary kiln body 3 is provided on the support plate 2, and a recovery mechanism for recovering waste heat on the rotary kiln body 3 is provided on the rotary kiln body 3. The recovery mechanism includes a first annular placement cavity 501 and a second annular placement cavity 502 opened inside the rotary kiln body 3. The second annular placement cavity 502 is arranged closer to the inside of the rotary kiln body 3 than the first annular placement cavity 501. An installation plate 503 is provided on the inclined side of the rotary kiln body 3. Two support rods 504 are fixed on the installation plate 503, and the other ends of the two support rods 504 are fixed to the bottom plate 1. A first connection pipe 505 and a second connection pipe 506 are installed on the installation plate 503. One ends of the first connection pipe 505 and the second connection pipe 506 are respectively communicated with the inside of the first annular placement cavity 501 and the second annular placement cavity 502. The other ends of the first connection pipe 505 and the second connection pipe 506 are connected to an installation pipe 507. A delivery pipe 508 is installed on the installation pipe 507. A pumping and pressing mechanism for pumping and pressing the inside of the second annular placement cavity 502 is provided on the rotary kiln body 3. A blocking mechanism for blocking the second connection pipe 506 is provided on the second connection pipe 506. When the rotary kiln body 3 is no longer in use and rotating, the water to be heated externally is respectively delivered to the inside of the first annular placement cavity 501 and the second annular placement cavity 502 through the delivery pipe 508, the installation pipe 507, the second connection pipe 506 and the first connection pipe 505. At this time, the waste heat generated after the use of the rotary kiln body 3 can heat the water inside the first annular placement cavity 501 and the second annular placement cavity 502, which is convenient for recovering the waste heat after the use of the rotary kiln body 3, reducing the heat waste during the use of the rotary kiln body 3, and facilitating the operation and use of the rotary kiln.

[0032] Specifically, the pumping and pressing mechanism includes a fixed pipe 601 installed on the rotary kiln body 3. One end of the fixed pipe 601 is communicated with the inside of the second annular placement cavity 502. Two one-way valves 602 are installed on the fixed pipe 601, and the conduction directions of the two one-way valves 602 are from the inside of the second annular placement cavity 502 to the outside of the fixed pipe 601. An operation pipe 603 is installed on the fixed pipe 601. A push plate 604 is connected to the fixed pipe 601 through a connection component. A push rod 605 is fixed on the push plate 604. The other end of the push rod 605 penetrates into the operation pipe 603 and is fixed with a piston. The piston is slidably connected inside the operation pipe 603. A transmission mechanism for driving the push plate 604 is provided on the rotary kiln body 3. Therefore, during the rotation of the rotary kiln body 3, through the mutual transmission between the inclined surfaces 802 on each L-shaped push plate 801 and the L-shaped transmission plate 803, the water and air inside the second annular placement cavity 502 can be continuously sucked between the two one-way valves 602 and discharged from the fixed pipe 601, so that the second annular placement cavity 502 near the inside of the rotary kiln body 3 is evacuated.

[0033] Specifically, the connection component includes a plurality of T-shaped rods 701 slidably connected to the push plate 604. One end of each T-shaped rod 701 is fixed to the fixed pipe 601. A first spring 702 is sleeved on the side wall of each T-shaped rod 701. During the movement of the push plate 604, the first spring 702 on each T-shaped rod 701 is deformed by force to generate an elastic force. Through the elastic force of the first spring 702, it is convenient for the push plate 604 to move back to its original position.

[0034] Specifically, the transmission mechanism includes a plurality of L-shaped push plates 801 fixed on one side of the rotary kiln body 3. An inclined surface 802 is provided on each L-shaped push plate 801. An L-shaped transmission plate 803 is fixed on the push plate 604. The L-shaped transmission plate 803 is abutted against the inclined surface 802. During the rotation of the rotary kiln body 3, each L-shaped push plate 801 is driven to rotate synchronously. During the rotation of the L-shaped push plate 801, when the inclined surface 802 on the L-shaped push plate 801 abuts against the L-shaped transmission plate 803, under the action of force transmission, the L-shaped transmission plate 803 is pushed to move towards the fixed pipe 601.

[0035] Specifically, the plugging mechanism includes an installation box 901 installed on the second connecting pipe 506. A plugging plate 902 for plugging the inside of the installation box 901 is connected to the installation box 901 through a reset component. A pushing mechanism for pushing the plugging plate 902 is provided on the rotary kiln body 3.

[0036] Specifically, the pushing mechanism includes a rotating shaft 1101 rotatably connected to the rotary kiln body 3. One end of the sealing plate 902 is fixed with an arc-shaped plate 1104. A plurality of pushing components for pushing the arc-shaped plate 1104 are arranged on the outer side wall of the rotating shaft 1101. A rotating mechanism for rotating the rotating shaft 1101 is arranged on the rotary kiln body 3. During the rotation of the rotating shaft 1101, under the action of centrifugal force, each pushing pin 1103 is respectively driven to slide on each mounting sleeve 1102. Through the sliding of each pushing pin 1103 on the mounting sleeve 1102, one end of the pushing pin 1103 abuts against the arc-shaped plate 1104. Under the action of force transmission, the arc-shaped plate 1104 and the sealing plate 902 are pushed to move towards the inside of the mounting box 901 and seal the mounting box 901.

[0037] Specifically, the reset component includes strip-shaped plates 1001 fixed on both sides of the mounting box 901. A reset rod 1002 is slidably connected to the two strip-shaped plates 1001. One end of the reset rod 1002 is fixed to one side of the sealing plate 902. A second spring 1003 is sleeved on the side wall of each reset rod 1002. When the rotary kiln body 3 stops rotating and is no longer in use, each pushing pin 1103 on each mounting sleeve 1102 is respectively reset under the elastic force of each reset spring. At this time, each pushing pin 1103 no longer pushes the arc-shaped plate 1104. At this time, the arc-shaped plate 1104 and the sealing plate 902 are respectively reset under the elastic force of each second spring 1003.

[0038] Specifically, the pushing component includes a mounting sleeve 1102 rotatably connected to the outer side wall of the rotating shaft 1101. A pushing pin 1103 for pushing the arc-shaped plate 1104 is slidably connected to the mounting sleeve 1102 through a reset spring. During the rotation of the rotating shaft 1101, under the action of centrifugal force, each pushing pin 1103 is respectively driven to slide on each mounting sleeve 1102.

[0039] Specifically, the rotating mechanism includes a first annular rack 1201 fixed on the outer side wall of the rotary kiln body 3. A first gear 1202 is fixed on the rotating shaft 1101. The first gear 1202 and the first annular rack 1201 are meshed with each other. During the rotation of the rotary kiln body 3, through the meshing transmission between the first annular rack 1201 and the first gear 1202, the rotating shaft 1101 is driven to rotate under force.

[0040] Specifically, the driving mechanism includes a driving motor 401 installed on the support plate 2. The output end of the driving motor 401 penetrates through the support plate 2 and is fixed with a second gear 402. A second annular rack 403 is fixed on the side wall of the rotary kiln body 3. The second annular rack 403 and the second gear 402 are meshed with each other. Start the driving motor 401 to drive the second gear 402 to rotate. During the rotation of the second gear 402, through the meshing transmission between the second gear 402 and the second annular rack 403, the rotary kiln body 3 is driven to rotate, facilitating the rotation of the rotary kiln body 3.

[0041] Working principle: During the use of the rotary kiln body 3, first, start the driving motor 401 to drive the second gear 402 to rotate. During the rotation of the second gear 402, through the meshing transmission between the second gear 402 and the second annular rack 403, the rotary kiln body 3 is driven to rotate. During the rotation of the rotary kiln body 3, through the meshing transmission between the first annular rack 1201 and the first gear 1202, the rotating shaft 1101 is driven to rotate under force. During the rotation of the rotating shaft 1101, under the action of centrifugal force, each pushing pin 1103 slides on each mounting sleeve 1102 respectively. Through the sliding of each pushing pin 1103 on the mounting sleeve 1102, one end of the pushing pin 1103 abuts against the arc-shaped plate 1104. Under the action of force transmission, the arc-shaped plate 1104 and the sealing plate 902 are pushed towards the inside of the mounting box 901 to seal the mounting box 901, preventing external water from entering the inside of the second annular placement cavity 502 through the delivery pipe 508, the mounting pipe 507 and the second connecting pipe 506.

[0042] Then, while the rotary kiln body 3 is rotating, it drives each L-shaped push plate 801 to rotate synchronously. During the rotation of the L-shaped push plate 801, when the inclined surface 802 on the L-shaped push plate 801 abuts against the L-shaped transmission plate 803, under the action of force transmission, it pushes the L-shaped transmission plate 803 to move towards the fixed pipe 601. During the movement of the L-shaped transmission plate 803, it drives the push plate 604 to move synchronously. During the movement of the push plate 604, it causes the first springs 702 on each T-shaped rod 701 to be deformed under force and generate elastic force. And during the movement of the push plate 604, it drives the piston to slide inside the operation pipe 603 through the push rod 605. Since the conduction directions of the two one-way valves 602 are from the inside of the second annular placement cavity 502 to the outside of the fixed pipe 601, through the push of the piston, the gas between the two one-way valves 602 is pushed out from the fixed pipe 601. When the inclined surface 802 on the L-shaped push plate 801 does not abut against the L-shaped transmission plate 803, the L-shaped transmission plate 803, the L-shaped push plate 801 and the push plate 604 are reset under the elastic force of each first spring 702. During the reset process of the push plate 604, it drives the piston to perform a reset movement synchronously through the push rod 605. During the reset movement of the piston, a negative pressure is generated between the piston and the two one-way valves 602. Under the action of pressure, a part of the water and air stored inside the second annular placement cavity 502 is pumped out. Therefore, during the rotation of the rotary kiln body 3, through the mutual transmission between the inclined surface 802 on each L-shaped push plate 801 and the L-shaped transmission plate 803, the water and air inside the second annular placement cavity 502 can be continuously sucked between the two one-way valves 602 and discharged from the fixed pipe 601, so that the second annular placement cavity 502 close to the inside of the rotary kiln body 3 is evacuated. Through the evacuation treatment of the second annular placement cavity 502, it is convenient to cut off the temperature transfer between the inside and the outside of the rotary kiln body 3, reduce the heat loss during the use of the rotary kiln body 3, and facilitate the efficient operation and use of the rotary kiln body 3;

[0043] Finally, when the rotary kiln body 3 is no longer rotating and in use, the push pins 1103 on each mounting sleeve 1102 are reset under the elastic force of each return spring. At this time, each push pin 1103 no longer pushes the arc-shaped plate 1104. At this time, the arc-shaped plate 1104 and the plugging plate 902 are reset under the elastic force of each second spring 1003. Through the reset of the plugging plate 902, the plugging plate 902 no longer plugs the interior of the mounting box 901, and the water to be heated outside is respectively transported to the interior of the first annular placement cavity 501 and the second annular placement cavity 502 through the delivery pipe 508, the mounting pipe 507, the second connecting pipe 506 and the first connecting pipe 505. At this time, the waste heat generated after the use of the rotary kiln body 3 can heat the water inside the first annular placement cavity 501 and the second annular placement cavity 502 for use, facilitating the recovery of the waste heat after the use of the rotary kiln body 3, reducing the heat waste during the use of the rotary kiln body 3, and facilitating the operation and use of the rotary kiln.

[0044] The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention. The technologies, shapes, and structures not described in detail in the present invention are all well-known technologies.

Claims

1. A waste heat recovery system for a rotary kiln and a rotary kiln, characterized by: The invention comprises a bottom plate (1) and two support plates (2) mounted on the bottom plate (1), wherein a rotary kiln body (3) is rotatably connected to the two support plates (2), the rotary kiln body (3) is arranged to be inclined toward one side, a driving mechanism for driving the rotary kiln body (3) to rotate is arranged on the support plates (2), and a recovery mechanism for recovering waste heat from the rotary kiln body (3) is arranged on the rotary kiln body (3); The recovery mechanism comprises a first annular placement cavity (501) and a second annular placement cavity (502) provided inside the rotary kiln body (3), wherein the second annular placement cavity (502) is arranged closer to the interior of the rotary kiln body (3) than the first annular placement cavity (501), and a mounting plate (503) is provided on one inclined side of the rotary kiln body (3), and two support rods (504) are fixed on the mounting plate (503), and the other ends of the two support rods (504) are fixed to the bottom plate (1), and a first connecting pipe (505) and a second connecting pipe (506) are installed on the mounting plate (503). 06), one end of the first connecting pipe (505) and the second connecting pipe (506) are respectively connected to the interior of the first annular placement cavity (501) and the second annular placement cavity (502), the other end of the first connecting pipe (505) and the second connecting pipe (506) are connected to a mounting pipe (507), a delivery pipe (508) is installed on the mounting pipe (507), a pumping mechanism for pumping pressure inside the second annular placement cavity (502) is provided on the rotary kiln body (3), and a blocking mechanism for blocking the second connecting pipe (506) is provided on the second connecting pipe (506); The pumping and pressing mechanism comprises a fixed tube (601) mounted on the rotary kiln body (3), one end of the fixed tube (601) being in communication with the interior of the second annular placement cavity (502), two one-way valves (602) being mounted on the fixed tube (601), the conduction direction of the two one-way valves (602) being from the interior of the second annular placement cavity (502) to the exterior of the fixed tube (601), an operating tube (603) being mounted on the fixed tube (601), a push plate (604) being connected to the fixed tube (601) via a connecting assembly, a push rod (605) being fixed to the push plate (604), the other end of the push rod (605) being passed through the interior of the operating tube (603) and being fixed with a piston, the piston being slidably connected to the interior of the operating tube (603), and a transmission mechanism for driving the push plate (604) being provided on the rotary kiln body (3); The connecting assembly comprises a plurality of T-shaped rods (701) slidably connected to the push plate (604), one end of each T-shaped rod (701) being fixed to the fixed tube (601), and a first spring (702) being sleeved on the side wall of each T-shaped rod (701); The transmission mechanism comprises a plurality of L-shaped push plates (801) fixed to one side of the rotary kiln body (3), each of the L-shaped push plates (801) being provided with an inclined surface (802), an L-shaped transmission plate (803) being fixed to the push plate (604), and the L-shaped transmission plate (803) being arranged to abut against the inclined surface (802).

2. The waste heat recovery system for a rotary kiln and the rotary kiln according to claim 1, characterized in that: The blocking mechanism comprises an installation box (901) installed on the second connecting pipe (506); a blocking plate (902) for blocking the interior of the installation box (901) is connected to the installation box (901) via a reset assembly; and a pushing mechanism for pushing the blocking plate (902) is provided on the rotary kiln body (3).

3. The waste heat recovery system for a rotary kiln and the rotary kiln according to claim 2, characterized in that: The pushing mechanism comprises a rotating shaft (1101) rotatably connected to the rotary kiln body (3); an arc-shaped plate (1104) is fixed to one end of the blocking plate (902); a plurality of pushing components for pushing the arc-shaped plate (1104) are provided on the outer side wall of the rotating shaft (1101); and a rotating mechanism for rotating the rotating shaft (1101) is provided on the rotary kiln body (3).

4. The waste heat recovery system for a rotary kiln and the rotary kiln according to claim 3, characterized in that: The reset assembly comprises strip plates (1001) fixed on both sides of the installation box (901), and reset rods (1002) are slidably connected to the two strip plates (1001), one end of the reset rod (1002) is fixed to one side of the blocking plate (902), and a second spring (1003) is sleeved on the side wall of each reset rod (1002).

5. The waste heat recovery system for a rotary kiln and the rotary kiln according to claim 3, characterized in that: The pushing assembly comprises a mounting sleeve (1102) rotatably connected to the outer side wall of the rotating shaft (1101), and a pushing pin (1103) for pushing the arc plate (1104) is slidably connected to the mounting sleeve (1102) via a return spring.

6. The waste heat recovery system for a rotary kiln and the rotary kiln according to claim 3, characterized in that: The rotating mechanism comprises a first annular rack (1201) fixed on the outer side wall of the rotary kiln body (3); a first gear (1202) is fixed on the rotating shaft (1101); the first gear (1202) and the first annular rack (1201) are meshed with each other.

7. The waste heat recovery system for a rotary kiln and the rotary kiln according to claim 1, characterized in that: The driving mechanism comprises a driving motor (401) mounted on a support plate (2); an output end of the driving motor (401) passes through the support plate (2) and is fixed with a second gear (402); a second annular rack (403) is fixed on a side wall of the rotary kiln body (3); the second annular rack (403) and the second gear (402) are meshed with each other.

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