Low emission limestone calcining kiln

Abstract

The utility model relates to the technical field of limestone calcining kiln discloses a kind of low emission limestone calcining kiln, including rack, the one side of the top of rack is fixedly connected with kiln head, the other side of the top of rack is fixedly connected with kiln tail, rotary calcining assembly, recovery and emission reduction assembly are sequentially arranged between the kiln head, the kiln tail, the recovery and emission reduction assembly includes recovery flue, heat preservation box, the bottom end of the recovery flue is fixedly connected on the upper surface of kiln tail, the inner wall of heat preservation box is connected to the outer surface of kiln head, the inner wall of heat preservation box one side is fixedly connected with air inlet pipe. In the utility model, through the recovery flue, heat preservation box, heat exchange pipe, purification tank, filter plate and other components of recovery and emission reduction assembly, the heat recovery and utilization of calcining flue gas is realized, while flue gas is purified and filtered, effectively reduce pollutant emission, achieve the double beneficial effects of energy saving and environmental protection.

Description

Technical Field

[0001] This utility model relates to the field of limestone calcining kiln technology, and in particular to a low-emission limestone calcining kiln. Background Technology

[0002] Limestone calcination is a fundamental process in building materials, metallurgy, chemical industry and other fields. As a core piece of equipment, the performance of the calcination kiln directly determines product quality, production efficiency and environmental protection level.

[0003] Limestone calcination kilns are core industrial equipment used to decompose limestone into calcium oxide and carbon dioxide at high temperatures. They are widely used in key fields such as building materials (cement and lime production), metallurgy (steel desulfurization), and chemicals (calcium carbide production).

[0004] While existing limestone calcining kilns achieve the function of limestone calcination, their calcination efficiency and stability suffer from several issues. Traditional calcining kilns generally suffer from poor power transmission in their rotary mechanisms. Most rely on simple gear meshing, lacking efficient lubrication and stable support structures. This results in high resistance and frequent jamming of the rotary kiln body, increasing energy consumption and affecting the uniformity of material calcination. Furthermore, material propulsion within the kiln largely depends on the kiln's tilt angle, lacking a directional material guiding structure, leading to localized over- or under-calcination and reducing product yield. Some calcining equipment designed for high-pulverization limestone also suffers from fine particles clogging the gaps in the material layer, obstructing gas flow within the kiln and further limiting production efficiency. In the field of energy conservation and environmental protection, the shortcomings of traditional equipment are even more pronounced. The high-temperature flue gas generated during calcination contains a large amount of waste heat. However, traditional kilns lack efficient heat recovery devices, and most of the waste heat is directly lost, resulting in energy waste. The coal consumption per ton of limestone is often as high as 160 kg or more. More importantly, the pollutants such as dust, sulfur dioxide, and nitrogen oxides contained in the flue gas are not fully purified and are directly emitted, which not only pollutes the atmosphere but also easily causes environmental problems such as acid rain. The dust emission concentration of traditional equipment is often difficult to meet environmental protection requirements. Although some enterprises have tried to modify traditional kilns, such as adding simple dust removal devices or waste heat recovery pipelines, the heat recovery efficiency is low and the pollutant treatment effect is limited due to structural design defects. Therefore, it is impossible to fundamentally solve the energy consumption and emission problems. To address these issues, a low-emission limestone calcining kiln is proposed. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a low-emission limestone calcining kiln, which aims to solve the problems of low calcination efficiency, poor stability, low waste heat utilization rate and excessive pollutant emissions in existing limestone calcining kilns.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a low-emission limestone calcining kiln, comprising a frame, a kiln head fixedly connected to one side of the top of the frame, and a kiln tail fixedly connected to the other side of the top of the frame, wherein a rotary calcining assembly and a recovery and emission reduction assembly are sequentially arranged between the kiln head and the kiln tail. The recycling and emission reduction assembly includes a recycling flue and an insulation box. The bottom end of the recycling flue is fixedly connected to the upper surface of the kiln tail. The inner wall of the insulation box is fitted and connected to the outer surface of the kiln head. An air inlet pipe is fixedly connected to one side of the inner wall of the insulation box, and an exhaust pipe is fixedly connected to the other side of the inner wall of the insulation box. A heat exchange pipe is fixedly connected between the air inlet pipe and the exhaust pipe. A purification box is fixedly connected to the top of the insulation box. A filter plate is movably installed on the top of the purification box. An exhaust pipe is fixedly connected to the outer surface of the purification box.

[0007] As a further description of the above technical solution: The air inlet pipe and the recovery smoke pipe are connected in a continuous manner, and the exhaust pipe and the purification box are connected in a continuous manner.

[0008] As a further description of the above technical solution: The heat exchange tubes are provided in multiples, and the multiple heat exchange tubes are arranged in a ring with equal spacing, and the inner surface of the multiple heat exchange tubes is attached to the inner wall of the kiln tail.

[0009] As a further description of the above technical solution: The outer side of the filter plate is movably engaged with the inner wall of the purification box, and a handle is fixedly connected to the top of the filter plate.

[0010] As a further description of the above technical solution: The rotary calcining assembly includes two mounting bases, which are mirror images of each other along the central axis of the upper surface of the frame. The inner sides of the two mounting bases are rotatably connected to rotating rings, and lubrication rollers are movably engaged between the rotating rings and the mounting bases. A lubrication pipe is fixedly connected to the top of the mounting base.

[0011] As a further description of the above technical solution: The bottom end of the lubrication tube is connected through a rotating groove between the mounting base and the rotating ring.

[0012] As a further description of the above technical solution: The inner wall of the rotating ring is fixedly connected to a rotary kiln body, and the inner wall of the rotary kiln body is fixedly connected to a spiral guide plate. Multiple spiral guide plates are evenly distributed along the length of the rotary kiln body.

[0013] As a further description of the above technical solution: An internal gear ring is fixedly connected to the outer wall of the rotary kiln body, a mounting frame is fixedly connected to the lower surface of the rotary kiln body, a motor is fixedly connected to the inner surface of the mounting frame, an external gear is fixedly connected to the output end of the motor, and the external gear is meshed with the internal gear ring.

[0014] This utility model has the following beneficial effects: 1. In this utility model, by using components such as the recovery flue pipe, insulation box, heat exchange tube, purification box, and filter plate of the emission reduction component, the heat of calcination flue gas is recovered and utilized, and the flue gas is purified and filtered, effectively reducing pollutant emissions and achieving the dual benefits of energy saving and environmental protection.

[0015] 2. In this utility model, the uniform calcination of limestone material is achieved through components such as the mounting base, rotating ring, lubricating roller, lubricating pipe, rotary kiln body, spiral guide plate, internal gear ring, mounting frame, motor, and external gear of the rotary calcination assembly. At the same time, the smoothness of the rotary kiln body rotation and the stability of power transmission are ensured, thereby improving calcination efficiency and equipment operation reliability. Attached Figure Description

[0016] Figure 1 This is a three-dimensional schematic diagram of a low-emission limestone calcining kiln proposed in this utility model; Figure 2 This is a schematic cross-sectional view of the rotary calcining component of a low-emission limestone calcining kiln proposed in this utility model. Figure 3 This is a schematic diagram of the structure of the recycling and emission reduction components at the frame, kiln head, and kiln tail of a low-emission limestone calcining kiln proposed in this utility model. Figure 4 This is a schematic diagram of a partially disassembled structure of the recycling and emission reduction component of a low-emission limestone calcining kiln proposed in this utility model.

[0017] Legend: 1. Frame; 2. Kiln head; 3. Kiln tail; 4. Rotary calcining assembly; 41. Mounting base; 42. Rotating ring; 43. Lubricating roller; 44. Lubricating pipe; 45. Rotary kiln body; 46. Spiral guide plate; 47. Internal gear ring; 48. Mounting frame; 49. Motor; 410. External gear; 5. Recycling and emission reduction assembly; 51. Recycling smoke pipe; 52. Insulation box; 53. Air inlet pipe; 54. Air outlet pipe; 55. Heat exchanger pipe; 56. Purification box; 57. Filter plate; 58. Smoke exhaust pipe. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Reference Figure 1 and Figure 2 This utility model provides an embodiment of a low-emission limestone calcining kiln, comprising a frame 1, which serves as the supporting carrier for the entire equipment and provides the installation foundation for the kiln head 2, kiln tail 3, and rotary calcining assembly 4. The kiln head 2 is fixedly connected to one side of the top of the frame 1, serving as the inlet for limestone material entering the calcining kiln. The kiln tail 3 is fixedly connected to the other side of the top of the frame 1, serving as the outlet for calcined material discharge and flue gas recovery. A rotary calcining assembly 4 is disposed between the kiln head 2 and the kiln tail 3, and the rotary calcining assembly 4 includes a mounting base 41. Mounting base 41 is used to support and mount components such as rotating ring 42. Two mounting bases 41 are provided, mirror-imagely arranged along the central axis of the upper surface of the frame 1. Rotating ring 42 is rotatably connected to the inner side of each mounting base 41. Rotating ring 42 is a key component for realizing the rotation of the rotary kiln body 45. Lubricating rollers 43 are movably engaged between rotating ring 42 and mounting base 41. Lubricating rollers 43 reduce friction between rotating ring 42 and mounting base 41, making rotation smoother. A lubrication pipe 44 is fixedly connected to the top of mounting base 41. The lubrication pipe 44 is used for... Adding lubricant to the rotating slot further reduces friction loss. The bottom end of the lubrication pipe 44 is connected through the rotating slot between the mounting base 41 and the rotating ring 42. The inner wall of the rotating ring 42 is fixedly connected to the rotary kiln body 45, which is the main cavity for limestone calcination. The inner wall of the rotary kiln body 45 is fixedly connected to the spiral guide plate 46. The spiral guide plate 46 is used to push the material forward when the rotary kiln body 45 rotates, and at the same time enhances the uniformity of calcination of the material. Multiple spiral guide plates 46 are evenly distributed along the length of the rotary kiln body 45. An internal gear ring 47 is fixedly connected to the outer wall of the rotary kiln body 45. The internal gear ring 47 is a key component for transmitting power from the motor 49. A mounting bracket 48 is fixedly connected to the lower surface of the rotary kiln body 45. The mounting bracket 48 is used to fix the motor 49. The motor 49 is fixedly connected to the inner surface of the mounting bracket 48. The motor 49 provides power for the rotation of the rotary kiln body 45. An external gear 410 is fixedly connected to the output end of the motor 49. The external gear 410 is meshed with the internal gear ring 47. The external gear 410 and the internal gear ring 47 mesh to transmit the power of the motor 49 to the rotary kiln body 45.

[0020] Reference Figure 1 , Figure 3 and Figure 4A recovery and emission reduction assembly 5 is installed between the kiln head 2 and the kiln tail 3. This assembly recovers heat from the flue gas and purifies it, achieving low emissions. The recovery and emission reduction assembly 5 includes a recovery flue pipe 51 and an insulation box 52. The recovery flue pipe 51 introduces the flue gas from the kiln tail 3 into the recovery system. The insulation box 52 provides insulation, improving heat exchange efficiency. The bottom end of the recovery flue pipe 51 is fixedly connected to the upper surface of the kiln tail 3. The inner wall of the insulation box 52 is fitted and connected to the outer surface of the kiln head 2. An air inlet pipe 53 is fixedly connected to one side of the inner wall of the insulation box 52. The air inlet pipe 53 is the channel for the flue gas to enter the heat exchange pipe 55, and it is connected to the recovery flue pipe 51. An exhaust pipe 54 is fixedly connected to the other side of the inner wall of the insulation box 52. The exhaust pipe 54 is the channel for the flue gas to exit after heat exchange. A heat exchange tube 55 is fixedly connected between the pipe 53 and the exhaust pipe 54. The heat exchange tube 55 is used to exchange heat between the flue gas and the kiln head 2 and recover the heat of the flue gas. There are multiple heat exchange tubes 55, which are arranged in a ring at equal intervals. The inner surface of the multiple heat exchange tubes 55 is in close contact with the inner wall of the kiln tail 3. A purification box 56 is fixedly connected to the top of the insulation box 52. The purification box 56 is used to purify the flue gas and reduce pollutant emissions. The exhaust pipe 54 is connected to the purification box 56. A filter plate 57 is movably installed on the top of the purification box 56. The filter plate 57 is used to filter particulate matter and other impurities in the flue gas to achieve flue gas purification. The outer side of the filter plate 57 is movably engaged with the inner wall of the purification box 56. A handle is fixedly connected to the top of the filter plate 57. An exhaust pipe 58 is fixedly connected to the outer surface of the purification box 56.

[0021] Working principle: First, limestone material enters from the kiln head 2, the motor 49 starts, and the external gear 410 at its output end meshes with the internal gear ring 47 on the outer wall of the rotary kiln body 45 to drive the rotary kiln body 45 to rotate on the mounting base 41 through the rotating ring 42. The lubricating roller 43 and lubricating pipe 44 help reduce friction and ensure smooth rotation. During the rotation of the rotary kiln body 45, the spiral guide plate 46 on the inner wall pushes the material forward towards the kiln tail 3, while realizing the uniform calcination of limestone. The flue gas generated during calcination enters the recovery flue pipe 51 from the kiln tail 3, and is then introduced into the heat exchange tubes 55 in the insulation box 52 through the air inlet pipe 53. Multiple heat exchange tubes 55 are distributed in a ring and attached to the inner wall of the kiln head 2 to exchange heat with the kiln head 2 and recover the heat from the flue gas. The insulation box 52 plays a role in heat preservation and improves the heat exchange efficiency. After heat exchange, the flue gas enters the purification box 56 through the exhaust pipe 54, and is filtered by the filter plate 57 on the top to remove particulate matter and other impurities. Finally, the purified flue gas is discharged from the exhaust pipe 58, achieving the environmental protection requirements of low emissions.

[0022] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A low-emission limestone calcining kiln, comprising a frame (1), characterized in that: A kiln head (2) is fixedly connected to one side of the top of the frame (1), and a kiln tail (3) is fixedly connected to the other side of the top of the frame (1). A rotary calcining assembly (4) and a recycling and emission reduction assembly (5) are arranged sequentially between the kiln head (2) and the kiln tail (3). The recycling and emission reduction component (5) includes a recycling flue (51) and an insulation box (52). The bottom end of the recycling flue (51) is fixedly connected to the upper surface of the kiln tail (3). The inner wall of the insulation box (52) is sleeved and connected to the outer surface of the kiln head (2). An air inlet pipe (53) is fixedly connected to one side of the inner wall of the insulation box (52), and an exhaust pipe (54) is fixedly connected to the other side of the inner wall of the insulation box (52). A heat exchange pipe (55) is fixedly connected between the air inlet pipe (53) and the exhaust pipe (54). A purification box (56) is fixedly connected to the top of the insulation box (52). A filter plate (57) is movably installed on the top of the purification box (56). An exhaust pipe (58) is fixedly connected to the outer surface of the purification box (56).

2. The low-emission limestone calcining kiln according to claim 1, characterized in that: The air inlet pipe (53) is connected to the smoke recovery pipe (51), and the exhaust pipe (54) is connected to the purification box (56).

3. The low-emission limestone calcining kiln according to claim 1, characterized in that: The heat exchange tubes (55) are provided in multiple ways. The multiple heat exchange tubes (55) are arranged in a ring with equal spacing, and the inner surface of the multiple heat exchange tubes (55) is attached to the inner wall of the kiln tail (3).

4. The low-emission limestone calcining kiln according to claim 1, characterized in that: The outer side of the filter plate (57) is movably engaged with the inner wall of the purification box (56), and a handle is fixedly connected to the top of the filter plate (57).

5. A low-emission limestone calcining kiln according to claim 1, characterized in that: The rotary calcining assembly (4) includes a mounting base (41), and there are two mounting bases (41). The two mounting bases (41) are mirrored along the central axis of the upper surface of the frame (1), and a rotating ring (42) is rotatably connected to the inner side of the two mounting bases (41). A lubricating roller (43) is movably engaged between the rotating ring (42) and the mounting base (41). A lubricating pipe (44) is fixedly connected to the top of the mounting base (41).

6. The low-emission limestone calcining kiln according to claim 5, characterized in that: The bottom end of the lubrication tube (44) is connected through a rotating groove between the mounting base (41) and the rotating ring (42).

7. A low-emission limestone calcining kiln according to claim 6, characterized in that: The inner wall of the rotating ring (42) is fixedly connected to a rotary kiln body (45), and the inner wall of the rotary kiln body (45) is fixedly connected to a spiral guide plate (46). Multiple spiral guide plates (46) are evenly distributed along the length direction of the rotary kiln body (45).

8. A low-emission limestone calcining kiln according to claim 7, characterized in that: An internal gear ring (47) is fixedly connected to the outer wall of the rotary kiln body (45), and a mounting frame (48) is fixedly connected to the lower surface of the rotary kiln body (45). A motor (49) is fixedly connected to the inner surface of the mounting frame (48), and an external gear (410) is fixedly connected to the output end of the motor (49). The external gear (410) and the internal gear ring (47) are meshed together.

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