Rotary cement kiln capable of recycling heat

Abstract

The invention discloses a rotary cement kiln capable of recycling heat, which belongs to the technical field of cement treatment equipment and comprises a kiln body, a kiln tail is arranged at one end of the kiln body, a recovery pipeline is arranged at the top of the kiln tail, a preheating mechanism is arranged at the other end of the recovery pipeline, and a discharging hopper is arranged on one side of the preheating mechanism. The preheating mechanism is arranged, generated high-temperature waste gas is discharged from a recycling pipeline at the kiln tail, heat of the waste gas is transmitted into the discharging hopper through a heat conduction plate to preheat materials, the waste gas can be located in the preheating box all the time by covering a sealing cover, and after the temperature is reduced, the waste gas is discharged from the recycling pipeline at the kiln tail, and the waste gas is discharged from the recycling pipeline at the kiln tail. The sealing cover is taken down, the cooled waste gas is filtered by the filter screen and then discharged to the outside, the sealing ring can increase the sealing performance of the sealing cover and the smoke exhaust pipe, the extension rod and the heat conducting plate are made of the same material, the contact area with materials can be increased, heat is recycled by preheating the materials through the waste gas, and the energy utilization rate can be increased.

Description

Technical Field

[0001] This invention belongs to the technical field of cement processing equipment, specifically relating to a cement rotary kiln that utilizes heat recycling. Background Technology

[0002] A rotary kiln is a type of kiln used for calcining cement (commonly known as a rotary kiln), belonging to the category of building materials equipment. Rotary kilns can be classified into cement kilns, metallurgical and chemical kilns, and lime kilns based on the materials they process. Cement kilns are mainly used for calcining cement clinker and are divided into two main categories: dry-process cement kilns and wet-process cement kilns. Metallurgical and chemical kilns are mainly used in the metallurgical industry for magnetizing and roasting lean iron ore in steel plants; oxidizing and roasting chromium and nickel iron ore; roasting high-alumina vanadium ore in refractory material plants; roasting clinker and aluminum hydroxide in aluminum plants; and roasting chromium ore sand and chromium ore powder in chemical plants.

[0003] Existing rotary kilns for cement that utilize heat recycling mix desulfurizing agents with pulverized coal and blow them out via a blower, allowing the material to come into direct and full contact with the powdered desulfurizing agents and pulverized coal. However, the resulting exhaust gas contains a large amount of heat energy, and if it is discharged directly, it will reduce energy efficiency. Furthermore, during operation, it is impossible to control the kiln body's lifting and lowering to ensure that the high-temperature gas and material are fully mixed, and it is also impossible to stir the pulverized coal in the pulverized coal hopper to prevent caking. Summary of the Invention

[0004] To address the problems mentioned in the background section, this invention provides a cement rotary kiln with heat recycling capabilities, featuring heat recovery, kiln body angle adjustment, and prevention of pulverized coal caking.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a cement rotary kiln for heat recycling, comprising a kiln body, a kiln tail at one end of the kiln body, a recovery pipe at the top of the kiln tail, a preheating mechanism at the other end of the recovery pipe, a feeding hopper on one side of the preheating mechanism, a feeding pipe fixedly connected to the bottom of the feeding hopper, a kiln head at the bottom of the feeding pipe, a pulverized coal injection pipe on one side of the kiln tail, a pulverized coal hopper at the top of the pulverized coal hopper, a stirring mechanism at the top of the pulverized coal hopper, a blower at the end of the pulverized coal injection pipe away from the kiln tail, a lifting mechanism at the bottom of the kiln body, and a support leg at the bottom of the lifting mechanism.

[0006] The preheating mechanism includes a preheating box, one side of which is fixedly connected to a recovery pipe. A smoke exhaust pipe is provided on the top of the preheating box, and a filter mechanism is provided on the outside of the smoke exhaust pipe. A heat-conducting plate is fixedly connected to the side of the hopper near the preheating box.

[0007] Preferably, the filtering mechanism includes insertion holes, insertion holes are provided on both sides of the exhaust pipe, a filter screen is provided inside the insertion holes, and a cover is provided on the top of the exhaust pipe.

[0008] Preferably, a sealing ring is fixedly connected to the bottom of the cap.

[0009] Preferably, an extension rod is fixedly connected to one side of the heat-conducting plate.

[0010] Preferably, the lifting mechanism includes a base plate, one end of which is fixedly connected to a rotating rod, a lifting plate is rotatably connected to the outer side of the rotating rod, an inclined plate is fixedly connected to the bottom side of the lifting plate, and an electric guide rail is fixedly connected to the top side of the base plate below the inclined plate, with rollers provided on the top of the electric guide rail.

[0011] Preferably, a buffer column is fixedly connected to the bottom of the lifting plate near the inclined plate.

[0012] Preferably, the stirring mechanism includes a top cover, the bottom of which is fixedly connected to the pulverized coal hopper, and a motor is fixedly connected to the top of the top cover. The motor's shaft is equipped with a drive shaft, and a stirring plate is provided on the outside of the drive shaft.

[0013] Preferably, the stirring plate has a circular hole on its side.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. This invention is equipped with a preheating mechanism. The high-temperature exhaust gas generated is discharged from the recovery pipe at the kiln tail. Both the recovery pipe and the preheating box are made of heat-insulating and heat-resistant materials. The heat-conducting plate is made of copper plate with good thermal conductivity. The heat of the exhaust gas is transferred to the feeding hopper by the heat-conducting plate to preheat the material in contact with it. Covering the box with a cover allows the exhaust gas to remain in the preheating box. After the temperature drops, the cover is removed, and the cooled exhaust gas is filtered through a filter screen before being discharged to the outside. The sealing ring can increase the sealing performance between the cover and the exhaust pipe. The extension rod is made of the same material as the heat-conducting plate, which can increase the contact area with the material. By preheating the material with exhaust gas to recycle the heat, the energy utilization rate can be improved.

[0016] 2. The present invention is equipped with a lifting mechanism. The base plate can stand on the ground through the support legs. The electric guide rail drives the rollers to move along the inclined plate. As the rollers move, the lifting plate slowly carries the kiln body to rotate along the rotating rod, lifting the kiln head and allowing the material to slide down the kiln body from the kiln head. When the kiln body is in a horizontal position, the buffer column can support the lifting plate and reduce the pressure on the rollers. By changing the height of the kiln head, the sliding efficiency of the material can be controlled, so that the material can be fully and evenly mixed with the high temperature gas.

[0017] 3. The present invention is equipped with a stirring mechanism. Coal powder is poured in from the feed port of the top cover. In order to prevent water vapor in the air from causing the coal powder to clump, the motor can be started to rotate the drive shaft, which in turn drives the stirring plate to rotate to break up the clumps of coal. The round hole allows the coal powder to pass through, preventing too much coal powder from adhering to the stirring plate. The rotation of the stirring plate can prevent the coal powder from clumping and facilitate feeding. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention;

[0019] Figure 2 This is a frontal structural diagram of the present invention;

[0020] Figure 3 This is a schematic diagram of the preheating mechanism of the present invention;

[0021] Figure 4 This is a schematic diagram of the filtration mechanism of the present invention;

[0022] Figure 5 This is a schematic diagram of the lifting mechanism of the present invention;

[0023] Figure 6 This is a schematic diagram of the stirring mechanism of the present invention;

[0024] In the diagram: 1. Kiln body; 2. Recovery pipe; 3. Preheating mechanism; 31. Preheating box; 32. Exhaust pipe; 33. Heat-conducting plate; 34. Filtering mechanism; 341. Insertion hole; 342. Filter screen; 343. Cover; 344. Sealing ring; 35. Extension rod; 4. Feed hopper; 5. Feed pipe; 6. Lifting mechanism; 61. Bottom plate; 62. Rotating rod; 63. Lifting plate; 64. Inclined plate; 65. Electric guide rail; 66. Roller; 67. Buffer column; 7. Pulverized coal injection pipe; 8. Pulverized coal hopper; 9. Mixing mechanism; 91. Top cover; 92. Motor; 93. Drive shaft; 94. Mixing plate; 95. Round hole; 10. Kiln tail; 11. Kiln head; 12. Support leg; 13. Blower. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Example 1

[0027] Please see Figure 1-6The present invention provides the following technical solution: a cement rotary kiln for heat recycling, comprising a kiln body 1, a kiln tail 10 at one end of the kiln body 1, a recovery pipe 2 at the top of the kiln tail 10, a preheating mechanism 3 at the other end of the recovery pipe 2, a feeding hopper 4 on one side of the preheating mechanism 3, a feeding pipe 5 fixedly connected to the bottom of the feeding hopper 4, a kiln head 11 at the bottom end of the feeding pipe 5, a pulverized coal injection pipe 7 on one side of the kiln tail 10, a pulverized coal hopper 8 at the top of the pulverized coal hopper 8, a stirring mechanism 9 at the top of the pulverized coal hopper 8, a blower 13 at the end of the pulverized coal injection pipe 7 away from the kiln tail 10, a lifting mechanism 6 at the bottom of the kiln body 1, and a support leg 12 at the bottom of the lifting mechanism 6.

[0028] The preheating mechanism 3 includes a preheating box 31, one side of which is fixedly connected to the recovery pipe 2. A smoke exhaust pipe 32 is provided on the top of the preheating box 31, and a filter mechanism 34 is provided on the outside of the smoke exhaust pipe 32. A heat-conducting plate 33 is fixedly connected to the side of the hopper 4 near the preheating box 31.

[0029] Specifically, the filter mechanism 34 includes a socket 341, the smoke exhaust pipe 32 has sockets 341 on both sides, a filter screen 342 is provided inside the socket 341, and a cover 343 is provided on the top of the smoke exhaust pipe 32.

[0030] By adopting the above technical solution, the generated high-temperature waste gas is discharged from the recovery pipe 2 of the kiln tail 10. The recovery pipe 2 and the preheating box 31 are both made of heat-insulating and heat-resistant materials. The heat-conducting plate 33 is made of copper plate with good thermal conductivity. The heat of the waste gas is transferred to the feeding hopper 4 by the heat-conducting plate 33 to preheat the material in contact. Covering with the cover 343 allows the waste gas to remain in the preheating box 31. After the temperature drops, the cover 343 is removed, and the cooled waste gas is filtered by the filter screen 342 before being discharged to the outside.

[0031] Specifically, a sealing ring 344 is fixedly connected to the bottom of the cap 343.

[0032] By adopting the above technical solution, the sealing ring 344 can increase the sealing performance between the cover 343 and the exhaust pipe 32.

[0033] Specifically, an extension rod 35 is fixedly connected to one side of the heat-conducting plate 33.

[0034] By adopting the above technical solution, the extension rod 35 and the heat-conducting plate 33 are made of the same material, which can increase the contact area with the material.

[0035] In this embodiment, the material enters the kiln body 1 from the kiln head 11, and the pulverized coal enters the pulverized coal hopper 8 into the pulverized coal injection pipe 7. Under the action of the blower 13, it enters the kiln tail 10 and is ignited. The generated hot gas then comes into contact with the material inside the kiln body 1. Finally, the calcined clinker flows out from the kiln tail 10 to cool, and the generated high-temperature exhaust gas is discharged from the recovery pipe 2 of the kiln tail 10. The recovery pipe 2 and the preheating box 31 are both made of heat-insulating and heat-resistant materials, and the heat-conducting plate 33 is made of copper plate with good thermal conductivity. The heat of the exhaust gas is transferred to the heat-conducting plate 33. The hot plate 33 transfers heat to the hopper 4 to preheat the material it comes into contact with. Covering the box with the cap 343 keeps the exhaust gas inside the preheating box 31. After the temperature drops, the cap 343 is removed, and the cooled exhaust gas is filtered through the filter screen 342 before being discharged to the outside. The sealing ring 344 increases the sealing between the cap 343 and the exhaust pipe 32. The extension rod 35 is made of the same material as the heat-conducting plate 33, which can increase the contact area with the material. By preheating the material with the exhaust gas, the energy utilization rate can be improved.

[0036] Example 2

[0037] The difference between this embodiment and embodiment 1 is that the lifting mechanism 6 includes a base plate 61, a rotating rod 62 is fixedly connected to one end of the base plate 61, a lifting plate 63 is rotatably connected to the outside of the rotating rod 62, an inclined plate 64 is fixedly connected to one side of the bottom of the lifting plate 63, an electric guide rail 65 is fixedly connected to the top of the base plate 61 below the inclined plate 64, and a roller 66 is provided on the top of the electric guide rail 65.

[0038] By adopting the above technical solution, the base plate 61 can stand on the ground through the support leg 12. The electric guide rail 65 drives the roller 66 to move along the inclined plate 64. As the roller 66 moves, the lifting plate 63 slowly carries the kiln body 1 to rotate along the rotating rod 62, lifting the kiln head 11, so that the material can slide down from the kiln head 11 along the kiln body 1. When the kiln body 1 is in a horizontal position.

[0039] Specifically, a buffer column 67 is fixedly connected to the bottom of the lifting plate 63 near the inclined plate 64.

[0040] By adopting the above technical solution, the buffer column 67 can support the lifting plate 63 and reduce the pressure on the roller 66.

[0041] In this embodiment, the electric guide rail 65 is connected to an external power source, and the base plate 61 can stand on the ground via the support legs 12. The electric guide rail 65 drives the rollers 66 to move along the inclined plate 64. As the rollers 66 move, the lifting plate 63 slowly rotates the kiln body 1 along the rotating rod 62, raising the kiln head 11 so that the material can slide down the kiln body 1 from the kiln head 11. When the kiln body 1 is in a horizontal position, the buffer column 67 can support the lifting plate 63, reducing the pressure on the rollers 66. By changing the height of the kiln head 11, the sliding efficiency of the material can be controlled, so that the material can be fully and evenly mixed with the high-temperature gas.

[0042] Example 3

[0043] The difference between this embodiment and embodiments 1 and 2 is that the stirring mechanism 9 includes a top cover 91, the bottom of the top cover 91 is fixedly connected to the pulverized coal hopper 8, the top of the top cover 91 is fixedly connected to a motor 92, the rotating shaft of the motor 92 is provided with a transmission shaft 93, and a stirring plate 94 is provided on the outside of the transmission shaft 93.

[0044] By adopting the above technical solution, pulverized coal is injected from the feed inlet of the top cover 91. In order to prevent water vapor in the air from causing the pulverized coal to clump, the motor 92 can be started to rotate the transmission shaft 93, which in turn drives the stirring plate 94 to rotate, thereby breaking up the clumps of coal.

[0045] Specifically, a circular hole 95 is provided on the side of the stirring plate 94.

[0046] By adopting the above technical solution, the circular hole 95 allows coal powder to pass through, preventing excessive coal powder from adhering to the stirring plate 94.

[0047] In this embodiment, the motor 92 is connected to an external power source, and pulverized coal is poured in through the feed inlet of the top cover 91. To prevent water vapor in the air from causing the pulverized coal to clump, the motor 92 can be started to rotate the drive shaft 93, which in turn drives the stirring plate 94 to rotate, thereby breaking up the clumps of coal. The round hole 95 allows the pulverized coal to pass through, preventing excessive pulverized coal from adhering to the stirring plate 94. The rotation of the stirring plate 94 can prevent the pulverized coal from clumping and facilitate feeding.

[0048] The structure and operating principle of the kiln body 1, feeding hopper 4, pulverized coal hopper 8, kiln tail 10, kiln head 11 and blower 13 in this invention have been disclosed in a cement rotary kiln disclosed in Chinese Patent Publication No. CN204535367U.

[0049] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cement rotary kiln with heat recycling, comprising a kiln body (1), characterized in that: One end of the kiln body (1) is provided with a kiln tail (10), the top of the kiln tail (10) is provided with a recovery pipeline (2), the other end of the recovery pipeline (2) is provided with a preheating mechanism (3), one side of the preheating mechanism (3) is provided with a lower hopper (4), the bottom of the lower hopper (4) is fixedly connected with a lower discharge pipe (5), the bottom end of the lower discharge pipe (5) is provided with a kiln head (11), one side of the kiln tail (10) is provided with a coal injection pipe (7), the top of the coal injection pipe (7) is provided with a pulverized coal hopper (8), the top of the pulverized coal hopper (8) is provided with a stirring mechanism (9), the end of the coal injection pipe (7) away from the kiln tail (10) is provided with a blower (13), the bottom of the kiln body (1) is provided with a lifting mechanism (6), the bottom of the lifting mechanism (6) is provided with a supporting leg (12). The preheating mechanism (3) comprises a preheating box (31), one side of the preheating box (31) is fixedly connected with the recovery pipeline (2), the top of the preheating box (31) is provided with a smoke exhaust pipe (32), the outer side of the smoke exhaust pipe (32) is provided with a filtering mechanism (34), and the side of the lower hopper (4) close to the preheating box (31) is fixedly connected with a heat conduction plate (33).

2. A cement rotary kiln with heat recycling according to claim 1, characterized in that: The filtering mechanism (34) comprises a jack (341), the two sides of the smoke exhaust pipe (32) are provided with the jack (341), the inner side of the jack (341) is provided with a filter screen (342), and the top of the smoke exhaust pipe (32) is provided with a cover (343).

3. A heat recycling cement rotary kiln according to claim 2, characterized in that: The bottom of the cover (343) is fixedly connected with a sealing ring (344).

4. A heat recycling cement rotary kiln according to claim 1, characterized in that: One side of the heat conduction plate (33) is fixedly connected with an extension rod (35).

5. A heat recycling cement rotary kiln according to claim 1, characterized in that: The lifting mechanism (6) comprises a bottom plate (61), one end of the bottom plate (61) is fixedly connected with a rotating rod (62), the outer side of the rotating rod (62) is rotatably connected with a lifting plate (63), one side of the bottom of the lifting plate (63) is fixedly connected with an inclined plate (64), one side of the top of the bottom plate (61) below the inclined plate (64) is fixedly connected with an electric guide rail (65), and the top of the electric guide rail (65) is provided with a roller (66).

6. A heat recycling cement rotary kiln according to claim 5, characterized in that: One side of the bottom of the lifting plate (63) close to the inclined plate (64) is fixedly connected with a buffer column (67).

7. A heat recycling cement rotary kiln according to claim 1, characterized in that: The stirring mechanism (9) comprises a top cover (91), the bottom of the top cover (91) is fixedly connected with the pulverized coal hopper (8), the top of the top cover (91) is fixedly connected with a motor (92), the rotating shaft of the motor (92) is provided with a transmission shaft (93), and the outer side of the transmission shaft (93) is provided with a stirring plate (94).

8. A heat recycling cement rotary kiln according to claim 7, characterized in that: The side of the stirring plate (94) is provided with a circular hole (95).

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