Cement clinker cooling waste heat recovery device

Abstract

The invention discloses a cement clinker cooling waste heat recovery device, and relates to the technical field of cement processing, the cement clinker cooling waste heat recovery device comprises a cylinder body, a ventilation pipe is vertically arranged in the cylinder body, a hollow spiral plate located between the inner wall of the cylinder body and the outer wall of the ventilation pipe is arranged in the cylinder body, and the hollow spiral plate is fixedly connected with the cylinder body and the ventilation pipe; the two ends of the ventilation pipe penetrate through the top and the bottom of the barrel correspondingly, the lower portion of the side wall of the ventilation pipe is connected with a circulating air inlet pipe, the upper portion of the side wall of the ventilation pipe is connected with a circulating air outlet pipe, and the upper end and the lower end of the hollow spiral plate are connected with a circulating water outlet pipe and a circulating water inlet pipe correspondingly. The circulating water outlet pipe and the circulating water inlet pipe both penetrate through the ventilation pipe and extend to the outside of the cylinder body, and an airflow disturbance mechanism is arranged in the ventilation pipe. The device is compact in structure and sufficient in heat exchange, has a two-way forced disturbance function, and can realize gas-water synergistic efficient waste heat recovery.

Description

Technical Field

[0001] This invention relates to the field of cement processing technology, and in particular to a device for recovering waste heat from cement clinker cooling. Background Technology

[0002] In cement production, the cooling of high-temperature clinker and the recovery of waste heat are key factors determining the system's thermal efficiency, energy consumption, and product quality. Currently, the industry commonly uses traditional cooling equipment such as grate coolers, which cool the clinker and recover some of the waste heat from the hot air through forced-air cooling. However, these methods still have many inherent drawbacks in actual operation.

[0003] Traditional equipment often employs open or semi-open material conveying cooling systems. The clinker's downward path is short and unevenly distributed, resulting in insufficient contact with the cooling medium. This leads to incomplete cooling, higher discharge temperatures, and significant energy waste as a large amount of waste heat is discharged without being effectively extracted. Furthermore, air and water flow are typically static or weakly disturbed heat exchange modes. A stable boundary layer easily forms on the gas side, while laminar flow and temperature stratification tend to occur on the water side. This limits heat exchange intensity, resulting in low waste heat recovery efficiency for both gas and water streams, making it difficult to achieve rapid, uniform, and thorough heat transfer. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a waste heat recovery device for cement clinker cooling.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A waste heat recovery device for cement clinker cooling includes a cylinder. A vent pipe is vertically installed inside the cylinder. A hollow spiral plate is located between the inner wall of the cylinder and the outer wall of the vent pipe inside the cylinder. The hollow spiral plate is fixedly connected to the cylinder and the vent pipe. The two ends of the vent pipe pass through the top and bottom of the cylinder, respectively. A circulating air inlet pipe is connected to the lower part of the side wall of the vent pipe, and a circulating air outlet pipe is connected to the upper part of the side wall of the vent pipe. A circulating water outlet pipe and a circulating water inlet pipe are connected to the upper and lower ends of the hollow spiral plate, respectively. Both the circulating water outlet pipe and the circulating water inlet pipe pass through the vent pipe and extend to the outside of the cylinder. An airflow disturbance mechanism is installed inside the vent pipe, and a water flow disturbance mechanism is installed inside the hollow spiral plate. A driving mechanism connected to the airflow disturbance mechanism and the water flow disturbance mechanism is installed at the top of the cylinder.

[0007] As a further improvement of the present invention, the driving mechanism includes a fixed frame fixed to the top of the cylinder, a dual-axis motor fixed to the upper end of the fixed frame, and a first turntable and a second turntable respectively fixedly connected to the two output shafts of the dual-axis motor. A linkage rod is rotatably connected to the edge of the first turntable, and a lever is rotatably connected to the edge of the second turntable.

[0008] As a further improvement of the present invention, the airflow disturbance mechanism includes a rotating rod disposed inside the vent pipe, the rotating rod passing through the top of the vent pipe and being rotatably connected to the vent pipe, a plurality of straight mesh plates being fixed on the side wall of the rotating rod, the straight mesh plates being located inside the vent pipe, and the plurality of straight mesh plates being equally spaced along the circumference of the rotating rod, a gear located above the vent pipe being fixedly sleeved on the side wall of the rotating rod, a reciprocating rod being provided on one side of the gear, a rack being fixed on the side wall of the reciprocating rod to mesh with the gear, and one end of the reciprocating rod being rotatably connected to a linkage rod.

[0009] As a further improvement of the present invention, the water flow disturbance mechanism includes a spiral rod disposed inside the hollow spiral plate, a spiral mesh plate fixed on the spiral rod, a lifting rod fixed at the upper end of the spiral rod, the upper end of the lifting rod passing through the hollow spiral plate and the cylinder and fixed with a linkage frame, and the lever being inserted into the linkage frame.

[0010] As a further improvement of the present invention, a guide rod is fixed to the top of the vent pipe, and a guide groove is provided at the end of the reciprocating rod away from the linkage rod, and the guide rod is slidably inserted into the inside of the guide groove.

[0011] As a further improvement of the present invention, a plurality of heat exchange fins are fixed on the inner wall of the vent pipe, and the plurality of heat exchange fins are arranged at equal intervals along the circumference of the vent pipe, and the heat exchange fins are spaced apart from the straight mesh plate.

[0012] As a further improvement of the present invention, the top of the cylinder is provided with a feed hopper and the bottom of the cylinder is provided with a discharge hopper.

[0013] As a further improvement of the present invention, three support legs are fixed at the bottom of the cylinder.

[0014] The beneficial effects of this invention are: The spiral descent channel of cement clinker, the axial flow channel of gas, and the spiral flow channel of cooling water are organically combined through a composite structure of hollow spiral plates and vent pipes. High-temperature clinker falls slowly and evenly along the spiral channel of the hollow spiral plate under gravity, with a long downward path and sufficient contact time with the heat exchange medium. Simultaneously, the cooling airflow is forcibly disturbed and rises within the vent pipe, and the cooling water is disturbed and flows within the hollow spiral plate. These three elements form a highly efficient and compact counter-current and cross-flow composite heat exchange mode. Under the synergistic effect of the dual disturbance mechanism, the heat of the clinker is extracted more quickly and thoroughly by the gas and water media, resulting in lower clinker temperature discharged from the hopper. Meanwhile, the media output from the self-circulating gas outlet and circulating water outlet carry more usable waste heat, achieving a dual improvement in cooling efficiency and waste heat recovery quality.

[0015] The airflow disturbance mechanism, through the reciprocating rotation of a rotating rod, drives multiple circumferentially spaced straight mesh plates to oscillate inside the vent pipe. This reciprocating oscillation not only directly disturbs the airflow and disrupts the gas boundary layer near the pipe wall, but also ensures more thorough and dynamic contact between the airflow and the multiple circumferentially spaced heat exchange fins fixed to the inner wall of the vent pipe. The spacing between the straight mesh plates and the fixed fins creates dynamically changing flow channels and disturbance elements in space, greatly enhancing the turbulence within the gas. This allows the cooling airflow entering from the self-circulating inlet pipe to absorb heat from the spirally falling cement clinker inside the cylinder more evenly and efficiently.

[0016] The water flow disturbance mechanism drives a spiral rod and a spiral mesh plate fixed to it via a lifting rod, causing them to reciprocate up and down within the hollow spiral plate. The movement path of the spiral mesh plate is closely integrated with the spiral cavity of the hollow spiral plate itself. Its up and down movement generates strong shearing and agitation on the internally flowing cooling water (entering from the circulating inlet pipe and exiting from the circulating outlet pipe). This disturbance effectively breaks the stable laminar flow or temperature stratification that may form in the spiral long flow channel, ensuring the uniformity of the cooling water temperature distribution throughout the flow channel and enhancing the convective heat transfer between the water flow and the wall of the hollow spiral plate. This maximizes the extraction of heat from the cement clinker conducted through the wall, significantly improving the efficiency of water-side waste heat recovery. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a cement clinker cooling waste heat recovery device proposed in this invention; Figure 2 This is a schematic diagram of the hollow spiral plate, vent pipe, circulating air inlet pipe, circulating air outlet pipe, circulating water inlet pipe, circulating water outlet pipe, airflow disturbance mechanism, water flow disturbance mechanism, and drive mechanism of a cement clinker cooling waste heat recovery device proposed in this invention. Figure 3 This is a schematic diagram of the hollow spiral plate, circulating water inlet pipe, and circulating water outlet pipe of a cement clinker cooling waste heat recovery device proposed in this invention. Figure 4 This is a schematic diagram of the ventilation pipe and heat exchange fins of a waste heat recovery device for cement clinker cooling proposed in this invention. Figure 5 This is a schematic diagram of the airflow disturbance mechanism, water flow disturbance mechanism, and drive mechanism of a cement clinker cooling waste heat recovery device proposed in this invention. Figure 6 for Figure 5 A partial structural diagram; Figure 7 This is a schematic diagram of the reciprocating rod, guide groove, and guide rod of a cement clinker cooling waste heat recovery device proposed in this invention.

[0018] In the diagram: 1. Cylinder, 2. Discharge hopper, 3. Circulating air inlet pipe, 4. Circulating air outlet pipe, 5. Feed hopper, 6. Support leg, 7. Circulating water inlet pipe, 8. Circulating water outlet pipe, 9. Ventilation pipe, 10. Hollow spiral plate, 11. Heat exchange fins, 12. Rotating rod, 13. Straight mesh plate, 14. Lifting rod, 15. Spiral rod, 16. Spiral mesh plate, 17. Gear, 18. Rack, 19. Reciprocating rod, 20. Guide rod, 21. Linkage rod, 22. First turntable, 23. Dual-axis motor, 24. Second turntable, 25. Lever, 26. Linkage frame, 27. Fixing frame, 28. Guide groove. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] See Figures 1-7 A waste heat recovery device for cement clinker cooling includes a cylinder 1, which provides installation support and a closed heat exchange space for the internal components. A feed hopper 5 is located at the top of the cylinder 1, used to introduce cement clinker into the cylinder 1 for cooling and heat exchange. A discharge hopper 2 is located at the bottom of the cylinder 1, used to discharge the cooled cement clinker from the cylinder 1. Three support legs 6 are fixed at the bottom of the cylinder 1, providing stable support and ensuring the cylinder 1 is placed stably. The cylinder 1 has a vertically installed vent pipe 9, which is used to circulate airflow and exchange heat with the cement clinker. Inside the cylinder 1, there is a hollow spiral plate 10 located between the inner wall of the cylinder 1 and the outer wall of the vent pipe 9. The hollow spiral plate 10 guides the cement clinker downwards and extends the heat exchange path. The hollow spiral plate 10 is fixedly connected to the cylinder 1 and the vent pipe 9. The two ends of the vent pipe 9 pass through the top and bottom of the cylinder 1, respectively. A circulating air inlet pipe 3 is connected to the lower part of the side wall of the vent pipe 9 for circulating air intake. Pipe 3 is used to send cooling airflow into the vent pipe 9. A circulating air outlet pipe 4 is connected to the upper side wall of the vent pipe 9. The circulating air outlet pipe 4 is used to discharge the heat-absorbing airflow from the vent pipe 9. A circulating water outlet pipe 8 and a circulating water inlet pipe 7 are connected to the upper and lower ends of the hollow spiral plate 10, respectively. The circulating water inlet pipe 7 is used to send cooling water into the hollow spiral plate 10, and the circulating water outlet pipe 8 is used to discharge the heat-absorbing water from the hollow spiral plate 10. Both the circulating water outlet pipe 8 and the circulating water inlet pipe 7 pass through the vent pipe 9 and extend... Extending to the outside of the cylinder 1, the circulating water outlet pipe 8 and the circulating water inlet pipe 7 pass through the vent pipe 9 to connect with the external circulation system. The vent pipe 9 is equipped with an airflow disturbance mechanism to disturb the airflow inside the vent pipe 9 to improve heat exchange efficiency. The hollow spiral plate 10 is equipped with a water flow disturbance mechanism to disturb the water flow inside the hollow spiral plate 10 to improve heat exchange efficiency. The top of the cylinder 1 is equipped with a drive mechanism connected to the airflow disturbance mechanism and the water flow disturbance mechanism.

[0021] The drive mechanism includes a fixed frame 27 fixed to the top of the cylinder 1. The fixed frame 27 provides stable mounting support for the dual-axis motor 23. The dual-axis motor 23 is fixed at the upper end of the fixed frame 27. The dual-axis motor 23 is used to output bidirectional rotational power to drive the two sets of mechanisms to move synchronously. The two output shafts of the dual-axis motor 23 are respectively fixedly connected to the first turntable 22 and the second turntable 24. The first turntable 22 and the second turntable 24 rotate synchronously with the dual-axis motor 23 to transmit power. The edge of the first turntable 22 is rotatably connected to the linkage rod 21, and the edge of the second turntable 24 is rotatably connected to the lever 25.

[0022] The airflow disturbance mechanism includes a rotating rod 12 disposed inside the ventilator 9. The rotating rod 12 passes through the top of the ventilator 9 and is rotatably connected to the ventilator 9. Multiple straight mesh plates 13 are fixed on the side wall of the rotating rod 12. The rotating rod 12 is used to drive the straight mesh plates 13 to rotate to achieve airflow disturbance. The straight mesh plates 13 are located inside the ventilator 9, and the multiple straight mesh plates 13 are equally spaced along the circumference of the rotating rod 12. The straight mesh plates 13 rotate with the rotating rod 12 to disturb the airflow inside the ventilator 9. A gear 17 located above the ventilator 9 is fixedly sleeved on the side wall of the rotating rod 12. The gear 17 is used to receive linear power and convert it into rotational power. A reciprocating rod 19 is provided on one side of the gear 17. The reciprocating rod 19 is used to transmit linear reciprocating power. A rack 18 that meshes with the gear 17 is fixed on the side wall of the reciprocating rod 19. The rack 18 meshes with the gear 17 to convert linear motion into rotational motion. One end of the reciprocating rod 19 is rotatably connected to the linkage rod 21.

[0023] The water flow disturbance mechanism includes a spiral rod 15 disposed inside the hollow spiral plate 10. The spiral rod 15 is used to drive the spiral mesh plate 16 to move to disturb the water flow. The spiral mesh plate 16 is fixed on the spiral rod 15. The spiral mesh plate 16 moves with the spiral rod 15 to disturb the water flow inside the hollow spiral plate 10. A lifting rod 14 is fixed to the upper end of the spiral rod 15. The lifting rod 14 is used to drive the spiral rod 15 to make linear lifting and lowering movements. The upper end of the lifting rod 14 passes through the hollow spiral plate 10 and the cylinder 1 and is fixed with a linkage frame 26. The linkage frame 26 is used to receive the power transmitted by the lever 25 and drive the lifting rod 14 to move. The lever 25 is inserted into the interior of the linkage frame 26. The lever 25 and the linkage frame 26 form a movable cooperation to transmit power.

[0024] A guide rod 20 is fixed to the top of the vent pipe 9. A guide groove 28 is provided at the end of the reciprocating rod 19 away from the linkage rod 21. The guide rod 20 is slidably inserted into the guide groove 28. The guide rod 20 is used to provide linear guidance for the reciprocating rod 19. The guide groove 28 is used to cooperate with the guide rod 20 to limit the movement direction of the reciprocating rod 19. The guide rod 20 and the guide groove 28 form a sliding fit to ensure the stability of the linear movement of the reciprocating rod 19.

[0025] Multiple heat exchange fins 11 are fixed on the inner wall of the vent pipe 9. The heat exchange fins 11 are used to increase the heat exchange area between the vent pipe 9 and the airflow. The multiple heat exchange fins 11 are arranged at equal intervals along the circumference of the vent pipe 9, and the heat exchange fins 11 and the straight mesh plate 13 are arranged at intervals to avoid motion interference and improve the disturbance effect.

[0026] In use, high-temperature cement clinker enters the cylinder 1 from the feed hopper 5 and slowly falls along the spiral channel formed by the hollow spiral plate 10 under gravity. The high-temperature cement clinker exchanges heat with the heat exchange gas inside the vent pipe 9 and the heat exchange water inside the hollow spiral plate 10, cooling the high-temperature cement clinker and recovering the residual heat. The cooled low-temperature clinker is finally discharged from the discharge hopper 2. The dual-shaft motor 23 is started to drive the first turntable 22 and the second turntable 24 on its two output shafts to rotate synchronously. The rotation of the first turntable 22... The linkage rod 21, which is rotatably connected to the edge of the disc, drives the reciprocating rod 19 to perform linear reciprocating motion. Under the cooperation of the guide rod 20 and the guide groove 28, the rod slides. The rack 18 on the side wall of the reciprocating rod 19 reciprocates accordingly and meshes with the gear 17. This drives the rotating rod 12, which is fixedly sleeved with the gear 17, to reciprocate within the vent pipe 9. The multiple straight mesh plates 13 on the rotating rod 12 swing back and forth accordingly to disturb the airflow that enters from the self-circulating air inlet pipe 3 and flows upward to the circulating air outlet pipe 4 inside the vent pipe 9, thereby disrupting the laminar flow phenomenon of the airflow and enhancing the heat exchange effect of the airflow. Simultaneously, the second turntable 24, connected to the other output shaft of the dual-axis motor 23, rotates, and the lever 25 on the edge of its disc rotates accordingly. The lever 25 moves the linkage frame 26 that is in movable cooperation with it, causing the lifting rod 14 and the spiral rod 15, which are fixedly connected to it, to reciprocate up and down inside the hollow spiral plate 10. The spiral mesh plate 16 fixed on the spiral rod 15 rises and falls accordingly, thereby disturbing the water flow inside the hollow spiral plate 10 that enters from the circulating water inlet pipe 7 and flows upward to the circulating water outlet pipe 8. After the cooling water inside the hollow spiral plate 10 is disturbed, the laminar flow phenomenon of the water flow is broken, and the heat exchange effect is enhanced.

[0027] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A waste heat recovery device for cement clinker cooling, characterized in that, The device includes a cylindrical body (1), inside which a vent pipe (9) is vertically installed. Inside the cylindrical body (1), a hollow spiral plate (10) is located between the inner wall of the cylindrical body (1) and the outer wall of the vent pipe (9). The hollow spiral plate (10) is fixedly connected to the cylindrical body (1) and the vent pipe (9). The two ends of the vent pipe (9) pass through the top and bottom of the cylindrical body (1) respectively. A circulating air inlet pipe (3) is connected to the lower part of the side wall of the vent pipe (9), and the upper part of the side wall of the vent pipe (9) is connected to... A circulating air outlet pipe (4) is connected to the hollow spiral plate (10). The upper and lower ends of the hollow spiral plate (10) are respectively connected to a circulating water outlet pipe (8) and a circulating water inlet pipe (7). The circulating water outlet pipe (8) and the circulating water inlet pipe (7) both pass through the air vent pipe (9) and extend to the outside of the cylinder (1). The air vent pipe (9) is equipped with an airflow disturbance mechanism. The hollow spiral plate (10) is equipped with a water flow disturbance mechanism. The top of the cylinder (1) is equipped with a drive mechanism connected to the airflow disturbance mechanism and the water flow disturbance mechanism.

2. The cement clinker cooling waste heat recovery device according to claim 1, characterized in that, The drive mechanism includes a fixed frame (27) fixed to the top of the cylinder (1). A dual-axis motor (23) is fixed to the upper end of the fixed frame (27). The two output shafts of the dual-axis motor (23) are respectively fixedly connected to a first turntable (22) and a second turntable (24). A linkage rod (21) is rotatably connected to the edge of the first turntable (22), and a lever (25) is rotatably connected to the edge of the second turntable (24).

3. The cement clinker cooling waste heat recovery device according to claim 2, characterized in that, The airflow disturbance mechanism includes a rotating rod (12) disposed inside the ventilation pipe (9). The rotating rod (12) passes through the top of the ventilation pipe (9) and is rotatably connected to the ventilation pipe (9). Multiple straight mesh plates (13) are fixed on the side wall of the rotating rod (12). The straight mesh plates (13) are located inside the ventilation pipe (9) and are evenly spaced along the circumference of the rotating rod (12). A gear (17) located above the ventilation pipe (9) is fixedly sleeved on the side wall of the rotating rod (12). A reciprocating rod (19) is provided on one side of the gear (17). A rack (18) meshing with the gear (17) is fixed on the side wall of the reciprocating rod (19). One end of the reciprocating rod (19) is rotatably connected to the linkage rod (21).

4. The cement clinker cooling waste heat recovery device according to claim 2, characterized in that, The water flow disturbance mechanism includes a spiral rod (15) disposed inside the hollow spiral plate (10), a spiral mesh plate (16) fixed on the spiral rod (15), a lifting rod (14) fixed at the upper end of the spiral rod (15), the upper end of the lifting rod (14) passing through the hollow spiral plate (10) and the cylinder (1) and fixed with a linkage frame (26), and the lever (25) inserted inside the linkage frame (26).

5. A cement clinker cooling waste heat recovery device according to claim 3, characterized in that, The top of the vent pipe (9) is fixed with a guide rod (20), and the end of the reciprocating rod (19) away from the linkage rod (21) is provided with a guide groove (28). The guide rod (20) is slidably inserted into the guide groove (28).

6. The cement clinker cooling waste heat recovery device according to claim 3, characterized in that, Multiple heat exchange fins (11) are fixed on the inner wall of the vent pipe (9). The multiple heat exchange fins (11) are arranged at equal intervals along the circumference of the vent pipe (9), and the heat exchange fins (11) are spaced apart from the straight mesh plate (13).

7. A cement clinker cooling waste heat recovery device according to claim 1, characterized in that, The top of the cylinder (1) is provided with a feed hopper (5), and the bottom of the cylinder (1) is provided with a discharge hopper (2).

8. A cement clinker cooling waste heat recovery device according to claim 1, characterized in that, The bottom of the cylinder (1) is fixed with three support legs (6).

Images