Smoke waste heat utilization system of lime rotary kiln

Abstract

The invention relates to the technical field of lime rotary kilns, and discloses a lime rotary kiln flue gas waste heat utilization system which comprises a kiln body, a waste heat utilization mechanism and a discharging frame rotationally mounted at one end of the kiln body, and the discharging frame is fixedly mounted on the ground through a mounting table; the waste heat utilization mechanism is arranged at one end of the kiln body, and the waste heat utilization mechanism utilizes waste heat to preheat lime at the feeding position through a mounting shaft and a stirring plate in the waste heat utilization mechanism; by arranging the preheating utilization mechanism, filtered high-temperature flue gas enters a heat exchanger to replace heat energy, high-temperature airflow is conveyed into a mounting shaft through an outlet of the heat exchanger and a branch pipe, the high-temperature airflow enters a gas conveying channel through a connecting cavity to heat a stirring plate, and crushed limestone enters a feeding frame and then is conveyed into a discharging port of the feeding frame. The limestone is heated while being stirred by the stirring plate, so that the limestone can be preheated more sufficiently, and the heat energy of high-temperature flue gas can be better recycled.

Description

Technical Field

[0001] The invention relates to the technical field of lime rotary kilns, in particular to a lime rotary kiln flue gas waste heat utilization system. Background Art

[0002] Lime rotary kiln is an industrial equipment used to calcine limestone to produce quicklime. It is widely used in building materials, metallurgy, chemical industry and other industries. When burning lime, the limestone is crushed and screened, and then fed into the kiln through the kiln head feeding port. The material moves forward in the kiln as the cylinder rotates, and is preheated by the high-temperature flue gas from the burner. After that, through burning, the limestone decomposes under the action of high temperature to produce quicklime and carbon dioxide. Nowadays, when the high-temperature flue gas of the lime rotary kiln is utilized, the high-temperature flue gas can be transported to the feeding point to preheat the limestone. However, after the high-temperature flue gas is blown in, it does not contact the limestone sufficiently, which affects the preheating effect of the limestone. Summary of the invention

[0003] The object of the present invention is to provide a lime rotary kiln flue gas waste heat utilization system to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solutions: A lime rotary kiln flue gas waste heat utilization system comprises a kiln body, one end of which is rotatably mounted with a discharging frame, and the discharging frame is fixedly mounted on the ground through a mounting platform. Waste heat utilization mechanism; the waste heat utilization mechanism is arranged at one end of the kiln body, and the waste heat utilization mechanism utilizes the waste heat to preheat the lime at the feeding position through the mounting shaft and the stirring plate therein; A smoke conveying mechanism is arranged at both ends of the kiln body, and the smoke conveying mechanism conducts diversion and conveying of the smoke through the conveying pipes and branch pipes therein.

[0005] Optionally, the waste heat utilization mechanism includes an insulation cylinder, a loading frame, a rotating part, a mounting shaft, a connecting chamber, a plurality of stirring plates, a gas supply channel and an exhaust chamber. The insulation cylinder is arranged at one end of the kiln body, the loading frame is fixedly installed on the top of the inner wall of the insulation cylinder, a rotating hole is opened at the top of the insulation cylinder, the rotating part is rotatably installed on the inner wall of the rotating hole, the mounting shaft is fixedly installed on the inner wall of the rotating part, the connecting chamber is opened at the top of the mounting shaft, a plurality of stirring plates are fixedly installed on the outer wall of the mounting shaft, the gas supply channel is opened on one side of the stirring plate, one end of the gas supply channel is connected with the connecting chamber, the exhaust chamber is opened at the bottom end of the mounting shaft, and the other end of the gas supply channel is connected with the exhaust chamber.

[0006] Optionally, the gas delivery channel is U-shaped, and both ends of the gas delivery channel are located on one side of the stirring plate.

[0007] Optionally, a connecting frame is fixedly installed on one side of the outer wall of the insulation tube, one end of the kiln body is rotatably installed on one side of the connecting frame, a feeding pipe is fixedly installed on the bottom end of the feeding frame, one end of the feeding pipe extends to one end inside the kiln body, and a feeding port is fixedly installed on the top of the insulation tube.

[0008] Optionally, the smoke conveying mechanism includes a first waste gas pipe, a first fan, a filter, a heat exchanger, a conveying pipe, a branch pipe, a waste gas barrel, a filter plate, and a second waste gas pipe, the first waste gas pipe being fixedly installed on the top of the discharge frame, the other end of the first waste gas pipe being fixedly installed on one end of the first fan inlet, one end of the first fan outlet being connected to the filter inlet end through a pipe, the filter outlet end being connected to the heat exchanger inlet end through a pipe, the conveying pipe being fixedly installed on one end of the heat exchanger outlet, the branch pipe being fixedly installed on the outer wall of the conveying pipe, the waste gas barrel being fixedly installed on the outer wall of the feeding pipe, the interior of the waste gas barrel being connected with the interior of the feeding pipe, the filter plate being fixedly installed on the inner ring of the waste gas barrel, the second waste gas pipe being fixedly installed on the outer wall of the waste gas barrel, the other end of the second waste gas pipe extending to the outside of the connecting frame, and the end of the second waste gas pipe extending to the outside of the connecting frame being fixedly installed on one end of the first fan inlet.

[0009] Optionally, one end of the delivery pipe is fixedly installed on one side of the outer wall of the insulation cylinder, and one end of the delivery pipe extends into the interior of the insulation cylinder, and an exhaust port is fixedly installed on the other side of the outer wall of the insulation cylinder.

[0010] Optionally, a connecting tube is fixedly installed at one end of the branch pipe, a mechanical seal is fixedly installed on the inner wall of the connecting tube, and the top end of the installation shaft is installed in the mechanical seal.

[0011] Optionally, a first bevel gear is fixedly installed on the top of the outer wall of the mounting shaft, and the first bevel gear is located outside the top end of the insulation cylinder. A motor is fixedly installed on the mounting platform on one side of the insulation cylinder, and a rotating shaft is fixedly installed on the output end of the motor. A second bevel gear is fixedly installed on one end of the rotating shaft, and the second bevel gear is meshed with the first bevel gear.

[0012] Optionally, a rotating cylinder is fixedly installed on the bottom end of the inner wall of the feeding tube, an exhaust rod is rotatably installed on the inner wall of the rotating cylinder, the top of the exhaust rod is fixedly installed on the bottom end of the mounting shaft, a plurality of exhaust holes are opened on the top of the outer wall of the exhaust rod, and the exhaust holes are connected to the exhaust chamber.

[0013] Optionally, a burner is provided on one side of the discharge frame, and an output end of the burner passes through the discharge frame and extends to the interior of one end of the kiln body discharge port.

[0014] (1) This scheme sets up a preheating and utilization mechanism. The filtered high-temperature flue gas enters the heat exchanger to replace the heat energy. The high-temperature airflow is then transported to the installation shaft through the heat exchanger outlet and the branch pipe. The high-temperature airflow enters the gas transmission channel through the connecting cavity to heat the stirring plate. After the crushed limestone enters the feeding frame, it is stirred and heated by the stirring plate, so that the limestone can be more fully preheated and the heat energy of the high-temperature flue gas can be better recovered and utilized. (2) This scheme can extract the flue gas from both ends of the kiln body by setting the first row of waste pipes and the second row of waste pipes, thereby accelerating the extraction of flue gas. The heat exchange gas blown out by the heat exchanger is transported to the insulation cylinder through the conveying pipe to heat the outer wall of the feeding frame, which can further preheat the limestone in the feeding frame and achieve a better preheating effect. (3) This solution can block limestone by installing a filter plate in the inner circle of the waste discharge tube; (4) This scheme provides an exhaust rod and a rotating cylinder to facilitate the discharge of high-temperature gas in the exhaust chamber into the insulation cylinder, and the high-temperature gas in the insulation cylinder is sent out of the insulation cylinder through the exhaust port together with the high-temperature gas in the insulation cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a side view of the present invention; Figure 3 The diagram of the first bevel gear and the second bevel gear of the present invention; Figure 4 It is a cross-sectional view of the heat preservation tube of the present invention; Figure 5 is a cross-sectional view of a stirring plate of the present invention; Figure 6 This is the installation diagram of the waste discharge barrel of the present invention; Figure 7 For the present invention Figure 4 Enlarged view of point B in the middle; Figure 8 For the present invention Figure 4 Enlarged view of point A in the middle.

[0016] In the accompanying drawings, the components represented by the reference numerals are listed as follows: 1. kiln body; 2. discharge frame; 3. first row of waste pipes; 4. first fan; 5. filter; 6. heat exchanger; 7. conveying pipe; 8. branch pipe; 9. insulation cylinder; 901. feeding frame; 10. connecting frame; 11. feeding port; 12. rotating member; 13. mounting shaft; 14. connecting chamber; 15. stirring plate; 16. gas transmission channel; 17. exhaust chamber; 18. exhaust rod; 19. exhaust hole; 20. rotating cylinder; 21. feeding pipe; 22. waste discharge cylinder; 23. filter plate; 24. second row of waste pipes; 25. connecting cylinder; 26. mechanical seal; 27. first bevel gear; 28. motor; 29. ​​rotating shaft; 30. second bevel gear; 31. exhaust port; 32. burner. DETAILED DESCRIPTION

[0017] 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.

[0018] See also Figure 1-Figure 8 The present invention provides a lime rotary kiln flue gas waste heat utilization system, comprising a kiln body 1, a discharging frame 2 is rotatably mounted at one end of the kiln body 1, and the discharging frame 2 is fixedly mounted on the ground through a mounting platform; a waste heat utilization mechanism; the waste heat utilization mechanism is arranged at one end of the kiln body 1, and the waste heat utilization mechanism utilizes waste heat to preheat the lime at the feeding position through the mounting shaft 13 and the stirring plate 15 therein; a flue gas conveying mechanism, the flue gas conveying mechanism is arranged at both ends of the kiln body 1, and the flue gas conveying mechanism conducts diversion and transportation of the flue gas through the conveying pipe 7 and the branch pipe 8 therein ; By setting up a preheating and utilization mechanism, the filtered high-temperature flue gas enters the heat exchanger 6 to replace the heat energy, and then the high-temperature airflow is transported to the installation shaft 13 through the outlet of the heat exchanger 6 and the branch pipe 8. The high-temperature airflow enters the gas transmission channel 16 through the connecting cavity 14 to heat the stirring plate 15. After the crushed limestone enters the feeding frame 901, it is stirred and heated by the stirring plate 15, so that the limestone can be more fully preheated and the heat energy of the high-temperature flue gas can be better recovered and utilized.

[0019] In some embodiments, see Figure 4 , Figure 5The waste heat utilization mechanism includes an insulation tube 9, a loading frame 901, a rotating member 12, a mounting shaft 13, a connecting chamber 14, a plurality of stirring plates 15, a gas transmission channel 16 and an exhaust chamber 17. The insulation tube 9 is arranged at one end of the kiln body 1, the loading frame 901 is fixedly installed on the top of the inner wall of the insulation tube 9, a rotating hole is opened at the top of the insulation tube 9, the rotating member 12 is rotatably installed on the inner wall of the rotating hole, the mounting shaft 13 is fixedly installed on the inner wall of the rotating member 12, the connecting chamber 14 is opened at the top of the mounting shaft 13, a plurality of stirring plates 15 are fixedly installed on the outer wall of the mounting shaft 13, the gas transmission channel 16 is opened on one side of the stirring plate 15, one end of the gas transmission channel 16 is connected with the connecting chamber 14, and the exhaust chamber 17 is opened in the mounting shaft 13. The bottom of the gas delivery channel 16 is connected to the exhaust chamber 17 at the other end. The gas delivery channel 16 is U-shaped, and both ends of the gas delivery channel 16 are located on one side of the stirring plate 15. A connecting frame 10 is fixedly installed on one side of the outer wall of the insulation tube 9, and one end of the kiln body 1 is rotatably installed on one side of the connecting frame 10. A feeding pipe 21 is fixedly installed on the bottom of the feeding frame 901, and one end of the feeding pipe 21 extends to one end inside the kiln body 1. A feeding port 11 is fixedly installed on the top of the insulation tube 9; the mounting shaft 13 and the stirring plate 15 can be made of aluminum bronze, which has high hardness and good thermal conductivity. By setting a U-shaped gas delivery channel 16, high-temperature gas can enter from one end of the gas delivery channel 16, and then be transported to the exhaust chamber 17 from the other end of the gas delivery channel 16.

[0020] In this example, the mounting shaft 13 is fixedly mounted on the rotating member 12 by means of bolts, and is mounted on the heat preservation cylinder 9 through the rotating member 12 .

[0021] In some embodiments, see Figure 1 , Figure 2The smoke conveying mechanism includes a first waste pipe 3, a first fan 4, a filter 5, a heat exchanger 6, a conveying pipe 7, a branch pipe 8, a waste tube 22, a filter plate 23 and a second waste pipe 24. The first waste pipe 3 is fixedly installed on the top of the discharge frame 2, and the other end of the first waste pipe 3 is fixedly installed on the inlet end of the first fan 4. The outlet end of the first fan 4 is connected to the inlet end of the filter 5 through a pipeline, and the outlet end of the filter 5 is connected to the inlet end of the heat exchanger 6 through a pipeline. The conveying pipe 7 is fixedly installed on the outlet end of the heat exchanger 6, the branch pipe 8 is fixedly installed on the outer wall of the conveying pipe 7, the waste tube 22 is fixedly installed on the outer wall of the feeding pipe 21, and the inside of the waste tube 22 is connected to the inside of the feeding pipe 21. The first and second waste pipes 3 and 24 are connected to each other, the filter plate 23 is fixedly installed on the inner circle of the waste discharge tube 22, the second waste pipe 24 is fixedly installed on the outer wall of the waste discharge tube 22, the other end of the second waste pipe 24 extends to the outside of the connecting frame 10, and one end of the second waste pipe 24 extending to the outside of the connecting frame 10 is fixedly installed at one end of the inlet of the first fan 4; by arranging the first waste pipe 3 and the second waste pipe 24, the flue gas can be extracted from both ends of the kiln body 1 to accelerate the extraction rate of the flue gas, and the heat exchange gas blown out by the heat exchanger 6 is transported to the insulation tube 9 through the conveying pipe 7 to heat the outer wall of the loading frame 901 therein, so as to further preheat the limestone in the loading frame 901 and make the preheating effect better.

[0022] In this example, high-temperature flue gas is extracted by the first fan 4 and transported to the filter 5. The filter 5 can use a bag filter in the prior art to filter particles in the flue gas, and then transport it to the heat exchanger 6. The heat exchanger 6 can use a plate heat exchanger. A second fan can be set on one side of the heat exchanger 6 to displace the heat inside the heat exchanger, and enter the delivery pipe 7 for transportation in the form of high-temperature airflow.

[0023] In this example, by setting a filter plate 23 in the inner circle of the waste discharge tube 22, the limestone can be blocked.

[0024] In some embodiments, see Figure 2 , Figure 3 , Figure 7, one end of the conveying pipe 7 is fixedly installed on one side of the outer wall of the insulation cylinder 9, and one end of the conveying pipe 7 extends to the inside of the insulation cylinder 9, and an exhaust port 31 is fixedly installed on the other side of the outer wall of the insulation cylinder 9, a connecting cylinder 25 is fixedly installed on one end of the branch pipe 8, and a mechanical seal 26 is fixedly installed on the inner wall of the connecting cylinder 25. The top of the mounting shaft 13 is installed in the mechanical seal 26, and a first bevel gear 27 is fixedly installed on the top of the outer wall of the mounting shaft 13. The first bevel gear 27 is located outside the top of the insulation cylinder 9, and a motor 28 is fixedly installed on the mounting platform on one side of the insulation cylinder 9. A rotating shaft 29 is fixedly installed on the output end of the motor 28, and a second bevel gear 30 is fixedly installed on one end of the rotating shaft 29, and the second bevel gear 30 is meshed with the first bevel gear 27; by setting the mechanical seal 26, the connection between the connecting cylinder 25 and the mounting shaft 13 can be sealed, and the motor 28 is started, and the first bevel gear 27 and the second bevel gear 30 are driven to rotate, thereby stirring the limestone in the feeding frame 901.

[0025] In some embodiments, see Figure 8 A rotating cylinder 20 is fixedly installed on the bottom end of the inner wall of the feeding tube 21, and an exhaust rod 18 is rotatably installed on the inner wall of the rotating cylinder 20. The top of the exhaust rod 18 is fixedly installed on the bottom end of the mounting shaft 13. A plurality of exhaust holes 19 are opened on the top of the outer wall of the exhaust rod 18. The exhaust holes 19 are connected with the exhaust chamber 17. By arranging the exhaust rod 18 and the rotating cylinder 20, it is convenient to discharge the high-temperature gas in the exhaust chamber 17 into the insulation cylinder 9, and transport it together with the high-temperature gas in the insulation cylinder 9 through the exhaust port 31 to other places where waste heat needs to be utilized.

[0026] For further information, please refer again to Figure 2 A burner 32 is provided on one side of the discharge frame 2, and the output end of the burner 32 passes through the discharge frame 2 and extends to the inside of one end of the discharge port of the kiln body 1; by providing the burner 32, the output end sprays fire to burn the limestone inside the kiln body 1.

[0027] When preheating the limestone at the loading point of the kiln body 1, the first row of waste pipes 3 and the second row of waste pipes 24 can extract the flue gas from both ends of the kiln body 1 to accelerate the extraction rate of the flue gas, and the heat exchange gas blown out by the heat exchanger 6 is transported to the insulation tube 9 through the delivery pipe 7 to heat the outer wall of the loading frame 901 therein, and at the same time, the high-temperature gas transports the high-temperature airflow to the installation shaft 13 through the branch pipe 8, and the high-temperature airflow enters the gas delivery channel 16 through the connecting cavity 14 to heat the stirring plate 15. After the crushed limestone enters the loading frame 901, it is stirred and heated by the stirring plate 15.

[0028] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A lime rotary kiln flue gas waste heat utilization system, characterized in that: include: A kiln body (1), wherein a discharging frame (2) is rotatably mounted on one end of the kiln body (1), and the discharging frame (2) is fixedly mounted on the ground via a mounting platform. A waste heat utilization mechanism; the waste heat utilization mechanism is arranged at one end of the kiln body (1), and the waste heat utilization mechanism utilizes waste heat to preheat the lime at the feeding position through the mounting shaft (13) and the stirring plate (15) therein; A smoke conveying mechanism, wherein the smoke conveying mechanism is arranged at both ends of the kiln body (1), and the smoke conveying mechanism conducts diversion and conveyance of the smoke through a conveying pipe (7) and a branch pipe (8) therein.

2. A lime rotary kiln flue gas waste heat utilization system according to claim 1, characterized in that: The waste heat utilization mechanism comprises a heat preservation tube (9), a loading frame (901), a rotating member (12), a mounting shaft (13), a connecting chamber (14), a plurality of stirring plates (15), a gas transmission channel (16) and an exhaust chamber (17), wherein the heat preservation tube (9) is arranged at one end of the kiln body (1), the loading frame (901) is fixedly mounted on the top of the inner wall of the heat preservation tube (9), a rotating hole is opened at the top of the heat preservation tube (9), the rotating member (12) is rotatably mounted on the inner wall of the rotating hole, and the mounting shaft (13) is connected to the kiln body (1). ) is fixedly mounted on the inner wall of the rotating member (12), the connecting chamber (14) is opened at the top end of the mounting shaft (13), a plurality of stirring plates (15) are fixedly mounted on the outer wall of the mounting shaft (13), the gas supply channel (16) is opened at one side of the stirring plate (15), one end of the gas supply channel (16) is connected to the connecting chamber (14), the exhaust chamber (17) is opened at the bottom end of the mounting shaft (13), and the other end of the gas supply channel (16) is connected to the exhaust chamber (17).

3. A lime rotary kiln flue gas waste heat utilization system according to claim 2, characterized in that: The gas delivery channel (16) is U-shaped, and both ends of the gas delivery channel (16) are located on one side of the stirring plate (15).

4. A lime rotary kiln flue gas waste heat utilization system according to claim 2, characterized in that: A connecting frame (10) is fixedly mounted on one side of the outer wall of the heat-insulating cylinder (9); one end of the kiln body (1) is rotatably mounted on one side of the connecting frame (10); a loading pipe (21) is fixedly mounted on the bottom end of the loading frame (901); one end of the loading pipe (21) extends to one end inside the kiln body (1); and a loading port (11) is fixedly mounted on the top end of the heat-insulating cylinder (9).

5. A lime rotary kiln flue gas waste heat utilization system according to claim 4, characterized in that: The smoke conveying mechanism comprises a first waste discharge pipe (3), a first fan (4), a filter (5), a heat exchanger (6), a conveying pipe (7), a branch pipe (8), a waste discharge cylinder (22), a filter plate (23) and a second waste discharge pipe (24); the first waste discharge pipe (3) is fixedly mounted on the top of the discharge frame (2); the other end of the first waste discharge pipe (3) is fixedly mounted on an inlet end of the first fan (4); an outlet end of the first fan (4) is connected to an inlet end of the filter (5) via a pipeline; the outlet end of the filter (5) is connected to an inlet end of the heat exchanger (6) via a pipeline; the conveying pipe (7) is fixedly mounted on the At one end of the air outlet of the heat exchanger (6), the branch pipe (8) is fixedly mounted on the outer wall of the delivery pipe (7), the waste discharge tube (22) is fixedly mounted on the outer wall of the feeding tube (21), the interior of the waste discharge tube (22) is connected to the interior of the feeding tube (21), the filter plate (23) is fixedly mounted on the inner circle of the waste discharge tube (22), the second waste discharge pipe (24) is fixedly mounted on the outer wall of the waste discharge tube (22), the other end of the second waste discharge pipe (24) extends to the outside of the connection frame (10), and the end of the second waste discharge pipe (24) extending to the outside of the connection frame (10) is fixedly mounted on one end of the inlet of the first fan (4).

6. A lime rotary kiln flue gas waste heat utilization system according to claim 5, characterized in that: One end of the delivery pipe (7) is fixedly mounted on one side of the outer wall of the heat-insulating cylinder (9), and one end of the delivery pipe (7) extends into the interior of the heat-insulating cylinder (9), and an exhaust port (31) is fixedly mounted on the other side of the outer wall of the heat-insulating cylinder (9).

7. A lime rotary kiln flue gas waste heat utilization system according to claim 5, characterized in that: A connecting tube (25) is fixedly mounted on one end of the branch pipe (8), a mechanical seal (26) is fixedly mounted on the inner wall of the connecting tube (25), and the top end of the mounting shaft (13) is mounted in the mechanical seal (26).

8. A lime rotary kiln flue gas waste heat utilization system according to claim 2, characterized in that: A first bevel gear (27) is fixedly mounted on the top of the outer wall of the mounting shaft (13), and the first bevel gear (27) is located outside the top end of the heat-insulating cylinder (9). A motor (28) is fixedly mounted on a mounting platform on one side of the heat-insulating cylinder (9), and a rotating shaft (29) is fixedly mounted on the output end of the motor (28). A second bevel gear (30) is fixedly mounted on one end of the rotating shaft (29), and the second bevel gear (30) is meshed with the first bevel gear (27).

9. A lime rotary kiln flue gas waste heat utilization system according to claim 4, characterized in that: A rotating cylinder (20) is fixedly mounted on the bottom end of the inner wall of the feeding tube (21), an exhaust rod (18) is rotatably mounted on the inner wall of the rotating cylinder (20), the top of the exhaust rod (18) is fixedly mounted on the bottom end of the mounting shaft (13), a plurality of exhaust holes (19) are formed on the top of the outer wall of the exhaust rod (18), and the exhaust holes (19) are communicated with the exhaust chamber (17).

10. A lime rotary kiln flue gas waste heat utilization system according to claim 1, characterized in that: A burner (32) is provided on one side of the discharge frame (2), and an output end of the burner (32) passes through the discharge frame (2) and extends to the interior of one end of the discharge port of the kiln body (1).

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