Low-carbon external combustion type edge transmission decomposition three-cylinder rotary kiln device

Abstract

The utility model discloses a low-carbon external combustion type edge transmission decomposition three-cylinder rotary kiln device which comprises a tunnel kiln used for forming a combustion cavity, an inner cylinder body, a middle cylinder body and an outer cylinder body are concentrically arranged in the tunnel kiln, and the wall faces of the inner cylinder body, the middle cylinder body and the outer cylinder body are fixed through connecting frames. The end part of the inner cylinder body is linked with a rotation driving mechanism, the inner cylinder body is driven to rotate by the rotation driving mechanism, and the middle cylinder body and the outer cylinder body are driven by the connecting frame to synchronously rotate along with the inner cylinder body; transfer structures used for transferring materials among the barrels are arranged between the inner barrel and the middle barrel and between the middle barrel and the outer barrel, and the materials among the inner barrel, the middle barrel and the outer barrel are transferred through the transfer structures, so that the overall length of the barrels is shortened, and the occupied area is reduced. The production capacity requirement of an original large rotary kiln is met, and efficient production of cement clinker is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of cement clinker calcination technology, specifically to a low-carbon external combustion edge-driven three-cylinder rotary kiln device. Background Technology

[0002] Currently, the cyclone preheater decomposition furnaces used in the cement and lime kiln industries involve high-temperature combustion of fuel in the furnace, with the high-temperature airflow transferring the fuel to the materials, causing the calcium carbonate to decompose. The carbon dioxide released during decomposition mixes with the combustion gases, resulting in low concentrations of carbon dioxide and high impurities in the decomposed calcium carbonate and other materials. Almost all of this carbon dioxide is emitted into the atmosphere. Even if carbon dioxide is recovered and purified, the equipment investment is large, the purification process is complex, and the production cost is very high, making it uneconomical and putting significant pressure on energy conservation and emission reduction. Currently, there are also processes using suspension preheaters combined with externally combusted rotary kilns to recover carbon dioxide and decompose limestone, magnesite, dolomite, or high-calcium coal gangue. However, these rotary kilns have large diameters and lengths, commonly ranging from 3.2 to 6 meters in diameter and 45 to 120 meters in length. The equipment and civil engineering investments are substantial, the operating costs are high, and the construction period is long. Smaller rotary kilns, on the other hand, cannot meet the production needs of large-volume materials. Utility Model Content

[0003] Technical objective: To address the shortcomings of existing rotary kiln structures, this utility model discloses a low-carbon external combustion edge-driven three-cylinder rotary kiln device.

[0004] Technical solution: To achieve the above technical objectives, the present invention adopts the following technical solution:

[0005] A low-carbon, externally combusted, edge-driven, three-cylinder rotary kiln device includes a tunnel kiln for forming a combustion chamber. An inner cylinder, a middle cylinder, and an outer cylinder are concentrically arranged within the tunnel kiln. The walls of the inner, middle, and outer cylinders are fixed together by a connecting frame. A rotation drive mechanism is connected to the end of the inner cylinder, driving it to rotate. The middle and outer cylinders rotate synchronously with the inner cylinder under the influence of the connecting frame. Transfer structures for material transfer between the inner and middle cylinders, and between the middle and outer cylinders, are provided. After entering the inner cylinder, the material moves layer by layer through the transfer structures to the middle and outer cylinders.

[0006] Preferably, the transfer structure of this utility model includes spiral blades disposed on the inner wall of the corresponding cylinder. The spiral blades are arranged according to the rotation direction of the corresponding cylinder, so that the material in the cylinder moves from one end of the cylinder to the other end. The inner cylinder and the middle cylinder are provided with material outlets at the ends corresponding to the direction of material conveying by the spiral blades, and the material enters the next cylinder through the material outlets.

[0007] Preferably, the middle cylinder of this utility model adopts a cylinder structure with one end open, and the opening forms a material outlet.

[0008] Preferably, the connecting frame of this utility model adopts a star-shaped frame, and when the cylinder rotates, the material moves with the spiral blades and passes through the star-shaped frame.

[0009] Preferably, the inner cylinder of this utility model is formed using a hollow shaft, which is inserted into the tunnel kiln. The end of the hollow shaft extends out of the tunnel kiln and is connected to the rotation drive mechanism to drive the rotation of the entire three-cylinder rotary kiln.

[0010] Preferably, the rotation drive mechanism of this utility model includes a drive motor, a gear and a gear ring. The gear is fixedly installed on the rotating end of the drive motor, and the gear ring is sleeved on the fixed hollow shaft. The gear meshes with the gear ring, and the drive motor drives the gear ring and the hollow shaft to rotate through the gear.

[0011] Preferably, the gear and gear ring of this invention are provided with an oil sump for lubrication and cooling of the meshing position.

[0012] Preferably, the hollow shaft of this invention is supported by rollers at both ends for limiting the axial movement of the hollow shaft. The rollers are provided with a flange that cooperates with the hollow shaft on the side near the hollow shaft, thereby blocking the axial movement of the hollow shaft.

[0013] Preferably, one end of the hollow shaft of this invention serves as the material inlet, and an inner cylinder is formed between the material inlet and the baffle plate disposed inside the hollow shaft. A cooling water chamber is formed on the other side of the baffle plate and a baffle plate disposed at the end of the hollow shaft. The material passing through the area of ​​the cooling water chamber is cooled by the cooling water chamber.

[0014] Preferably, the cooling water chamber of this invention has a groove along the wall at the end near the end plate to form the inlet and outlet of cooling water. As the hollow shaft rotates, cooling water flows in from the upper groove and flows out from the lower groove. A water receiving cone is provided in the cooling water chamber to guide the incoming cooling water to the ungrooved end, and the tip of the water receiving cone faces the side where the sealing plate is located.

[0015] Beneficial Effects: The low-carbon external combustion edge-driven three-cylinder rotary kiln device disclosed in this utility model has the following beneficial effects:

[0016] 1. This utility model uses a concentrically arranged cylindrical structure and a transfer structure to realize the transfer of materials between the inner, middle and outer cylinders, thereby achieving the production capacity requirements of the original large rotary kiln while shortening the overall length of the cylinder and reducing the occupied area, thus ensuring the efficient production of cement clinker.

[0017] 2. This utility model utilizes an external tunnel kiln to heat the cylinder. The material moves in the order of inner cylinder, middle cylinder, and outer cylinder for thermal decomposition, which can ensure the thermal decomposition process of the material, allowing it to be fully heated and decomposed, and ensuring the processing quality of the material.

[0018] 3. The transfer structure of this utility model adopts spiral blades, which can automatically transfer and transport materials as the cylinder rotates, eliminating the need for separate active transfer equipment, thereby simplifying the structure of the three-cylinder rotary kiln and reducing construction difficulty.

[0019] 4. The connecting frame of this utility model adopts a star-shaped frame, which will not affect the smooth passage of materials while heating the cylinder for heat transfer.

[0020] 5. This utility model uses a support roller with a flange for support, and an integral gear ring is installed on the outer surface of the hollow shaft end. Since the size of the hollow shaft is much smaller than that of the outer cylinder, the outer size of the gear ring is less than 2 meters, which makes it easy to process into an integral gear ring. The installation accuracy and meshing accuracy of the gear ring are greatly improved, which is beneficial to the control of the rotary kiln operation. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0022] Figure 1 This is an overall structural diagram of the three-cylinder rotary kiln device of this utility model;

[0023] Among them, 1-tunnel kiln, 2-inner cylinder, 3-middle cylinder, 4-outer cylinder, 5-water receiving cone, 6-spiral blade, 7-hollow shaft, 8-drive motor, 9-gear, 10-gear ring, 11-oil sump, 12-support roller, 13-sealing plate, 14-cooling water cavity, 15-end plate, 16-asbestos sealing ring. Detailed Implementation

[0024] Reference will now be made in detail to embodiments of the present disclosure, one or more of which are set forth herein. Each embodiment and example is provided by way of explanation of the apparatus, composition, and materials of the present disclosure, and not by way of limitation. Rather, the following description provides convenient illustrations for implementing exemplary embodiments of the present disclosure. Indeed, it will be apparent to those skilled in the art that various modifications and variations can be made to the teachings of the present disclosure without departing from the scope or spirit of the present disclosure.

[0025] like Figure 1As shown, this utility model discloses a low-carbon external combustion edge-driven three-cylinder rotary kiln device, including a tunnel kiln 1 for forming a combustion chamber. An inner cylinder 2, a middle cylinder 3, and an outer cylinder 4 are concentrically arranged inside the tunnel kiln 1. The walls of the inner cylinder 2, the middle cylinder 3, and the outer cylinder 4 are fixed together by a connecting frame. A rotation drive mechanism is connected to the end of the inner cylinder 2, which drives the inner cylinder 2 to rotate. The middle cylinder 3 and the outer cylinder 4 rotate synchronously with the inner cylinder 2 under the drive of the connecting frame. A transfer structure for transferring materials between the cylinders is provided between the inner cylinder 2 and the middle cylinder 3, and between the middle cylinder 3 and the outer cylinder 4. After entering from the inner cylinder 2, the material moves layer by layer to the middle cylinder 3 and the outer cylinder 4 through the transfer structure.

[0026] Specifically, the transfer structure of this utility model includes spiral blades 6 disposed on the inner wall of the corresponding cylinder. The spiral blades 6 are arranged according to the rotation direction of the corresponding cylinder, so that the material in the cylinder moves from one end of the cylinder to the other end. To facilitate the smooth movement of the material in the cylinder, the connecting frame of this utility model adopts a star-shaped frame. When the cylinder rotates, the material moves with the spiral blades 6 and passes through the star-shaped frame. The inner cylinder 2 and the middle cylinder 3 are provided with material outlets at the ends corresponding to the direction of material conveying by the spiral blades 6. The material enters the next cylinder through the material outlets. The spiral blades 6 are arranged according to the rotation direction of the cylinder so that the material moves from the feed end of the cylinder to the corresponding material outlet. The material moves forward in the cylinder under the drive of the spiral blades. This utility model uses spiral blades 6 that convey material synchronously with the rotation of the cylinder to transfer the material, which can simplify the structural design of the cylinder, thereby facilitating construction and improving construction efficiency.

[0027] In a specific embodiment, the middle cylinder 3 of this invention adopts a cylinder structure with one end open, forming a material outlet. Correspondingly, the outer cylinder 4 located inside the tunnel kiln 1 can also adopt a structure with one end open, discharging the material to the corresponding material receiving device at the opening side. To ensure the collection of decomposed powder materials and decomposition gases and to avoid the influence of flue gas generated by fuel combustion in the tunnel kiln on material collection, when the outer cylinder 4 adopts a structure with one end open, a fireproof asbestos sealing ring 16 is installed between the outer cylinder 4 and the inner wall of the tunnel kiln 1. The asbestos sealing ring 16 rotates with the outer cylinder 4, separating the combustion flue gas from the opening side of the outer cylinder 4, thereby facilitating the collection of carbon dioxide gas generated by decomposition and preventing the mixing of flue gas from affecting gas recovery. Since the gas from fuel combustion does not enter the three cylinders, the recovered carbon dioxide concentration is above 95%, which is more conducive to the production of food-grade carbon dioxide, increasing the added value of products, improving economic efficiency, reducing carbon emissions to the atmosphere, and achieving low-carbon production.

[0028] The inner cylinder 2 of this utility model is formed using a hollow shaft 7. The hollow shaft 7 is inserted into the tunnel kiln 1. The end of the hollow shaft 7 extends out of the tunnel kiln 1 and is connected to the rotation drive mechanism to drive the rotation of the three-cylinder rotary kiln as a whole. By directly using the hollow shaft 7 to form the inner cylinder 2, it is possible to ensure the smooth driving of the three-cylinder rotary kiln, while also simplifying the structure of the rotary kiln and facilitating construction.

[0029] The rotation drive mechanism of this utility model includes a drive motor 8, a gear 9, and a gear ring 10. The gear 9 is fixedly installed on the rotating end of the drive motor 8, and the gear ring 10 is sleeved on the fixed hollow shaft 7. The gear 9 meshes with the gear ring 10. The drive motor 8 drives the gear ring 10 and the hollow shaft 7 to rotate through the gear 9. An oil sump 11 for lubrication and cooling of the meshing position is provided at the meshing point of the gear 9 and the gear ring 10. An integral gear ring is installed on the outer surface of the hollow shaft end. Since the size of the hollow shaft is much smaller than that of the outer cylinder, the outer size of the gear ring is less than 2 meters, making it easy to process into an integral gear ring. The installation accuracy and meshing accuracy of the gear ring are greatly improved, which facilitates the operation of the three cylinders. In the rotation control of the rotary kiln, the high temperature of the material (400-800 degrees Celsius) fed into the hollow shaft 7 will continuously conduct high temperatures to the gear transmission mechanism and the belt (support roller and belt) meshing mechanism, affecting the normal operation of the transmission pinion, gear shaft, bearing, motor, etc. Utilizing an oil bath to cool the heat-generating parts of the gear and gear ring meshing reduces deformation caused by temperature rise, thereby ensuring gear meshing accuracy and extending the service life of the equipment. Simultaneously, the oil bath can adopt a double-shell structure, forming a water-cooling chamber on the outer shell, through which circulating cooling water absorbs the heat in the oil bath, thus cooling the oil bath. Similarly, corresponding circulating water pipes can be installed in the base of the support roller, the base of the bearing seat of gear 9, and other structures as needed to reduce the heat conducted from the high temperature of the material fed into the hollow shaft, minimizing the impact of high-temperature strength reduction on steel components.

[0030] The hollow shaft 7 of this invention is supported at both ends by rollers 12 for limiting the axial movement of the hollow shaft. Each roller 12 has a flange on the side closest to the hollow shaft 7 that cooperates with the hollow shaft 7, preventing axial movement. One end of the hollow shaft 7 serves as a material inlet, forming an inner cylinder 2 between it and a baffle plate 13 located within the hollow shaft 7. A cooling water chamber 14 is formed on the other side of the baffle plate 13, fitted with a baffle plate 15 at the end of the hollow shaft 7. The cooling water chamber 14 cools the material passing through its area. The cooling water chamber 14 has a groove along its wall near the end plate 15, forming an inlet and outlet for cooling water. As the hollow shaft 7 rotates, cooling water flows in from the upper groove and out from the lower groove. A receiving cone 5 is provided within the cooling water chamber 14 to guide the incoming cooling water to the ungrooved end, with the tip of the receiving cone 5 facing the side of the baffle plate.

[0031] The cooling water chamber 14 is designed to ensure that cooling water can smoothly enter from the slot when the hollow shaft 7 rotates. At the same time, the rotation of the hollow shaft 7, in conjunction with the water receiving cone 5, allows the cooling water to flow smoothly within the cooling water chamber 14, maintaining a cooling effect within the length range of the cooling water chamber 14. The purpose of the cooling water chamber 14 in this invention is to cool the fine powder material that is finally discharged from the outer cylinder 4 after decomposition, so as to facilitate the collection and storage of the material. For this purpose, the sealing position of the corresponding baffle plate 13 needs to be set according to the position of the material outlet of the outer cylinder 4, so that the material passes through the area where the cooling water chamber 14 is located during the discharge process, and the material is continuously cooled during the production process.

[0032] The three-cylinder rotary kiln of this invention can be used to decompose limestone, magnesite, dolomite, or high-calcium coal gangue, etc., decomposing the materials into fine powder and carbon dioxide gas. The fine powder can be directly sent to the finished product warehouse for storage, while the carbon dioxide gas is removed by dust removal equipment such as bag filter to remove the fine powder contained in the gas, and then sent to the carbon dioxide purification system for processing and purification.

[0033] The process of material decomposition using the three-cylinder rotary kiln of this invention is as follows: Before entering the rotary kiln, the material is preheated by equipment such as a suspension preheater. The drive motor 8 drives the entire three-cylinder rotary kiln to rotate. The three-cylinder rotary kiln is heated by fuel combustion inside the tunnel kiln 1, and the heat is transferred to the middle cylinder 3 and the inner cylinder 2 through heat radiation and the connecting frame. The preheated material enters from the inner cylinder 2 and, with the action of the spiral blades inside the inner cylinder 2, decomposes the material according to… Figure 1 The material moves from left to right in the direction shown. When it reaches the discharge port of the inner cylinder 2, it enters the middle cylinder 3. Although the rotation direction of the middle cylinder 3 is the same as that of the inner cylinder 2, by changing the orientation of the spiral blades 6 of the middle cylinder 3, the material can be directed according to... Figure 1 The material moves from right to left inside the middle cylinder 3. Similarly, after entering the outer cylinder 4, the material moves from left to right. During this process, the material is heated and decomposed into fine powder and carbon dioxide gas. The fine powder is cooled by the cooling water chamber 14 at the material outlet of the outer cylinder 4 and then sent to the finished product silo. The gaseous carbon dioxide is transported through the gas pipeline to the corresponding dust removal equipment to remove the fine powder contained in the gas, and then enters the carbon dioxide purification system.

[0034] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A low-carbon, externally combusted, edge-driven, three-cylinder rotary kiln device for decomposition, characterized in that, The system includes a tunnel kiln (1) for forming a combustion chamber. An inner cylinder (2), a middle cylinder (3), and an outer cylinder (4) are concentrically arranged inside the tunnel kiln (1). The walls of the inner cylinder (2), the middle cylinder (3), and the outer cylinder (4) are fixed together by a connecting frame. A rotation drive mechanism is connected to the end of the inner cylinder (2). The rotation drive mechanism drives the inner cylinder (2) to rotate. The middle cylinder (3) and the outer cylinder (4) rotate synchronously with the inner cylinder (2) under the drive of the connecting frame. A transfer structure for transferring materials between the cylinders is provided between the inner cylinder (2) and the middle cylinder (3), and between the middle cylinder (3) and the outer cylinder (4). The transfer structure includes a spiral blade (6) set on the inner wall of the corresponding cylinder. The spiral blade (6) is set according to the rotation direction of the corresponding cylinder, so that the material in the cylinder moves from one end of the cylinder to the other end. The inner cylinder (2) and the middle cylinder (3) are provided with material outlets at the ends corresponding to the direction of material conveying by the spiral blade (6). The material enters the next cylinder through the material outlet.

2. The low-carbon external combustion edge-driven three-cylinder rotary kiln device according to claim 1, characterized in that, The middle cylinder (3) adopts a cylinder structure with one end open, and the material outlet is formed through the opening.

3. The low-carbon external combustion edge-driven three-cylinder rotary kiln device according to claim 1, characterized in that, The connecting frame adopts a star-shaped frame. When the cylinder rotates, the material moves with the spiral blades (6) and passes through the star-shaped frame.

4. The low-carbon external combustion edge-drive three-cylinder rotary kiln device according to claim 1, characterized in that, The inner cylinder (2) is formed using a hollow shaft (7), which is inserted into the tunnel kiln (1). The end of the hollow shaft (7) extends out of the tunnel kiln (1) and is connected to the rotation drive mechanism to drive the rotation of the three-cylinder rotary kiln as a whole.

5. A low-carbon external combustion edge-driven three-cylinder rotary kiln device according to claim 4, characterized in that, The rotation drive mechanism includes a drive motor (8), a gear (9) and a gear ring (10). The gear (9) is fixedly installed on the rotating end of the drive motor (8), and the gear ring (10) is sleeved on the fixed hollow shaft (7). The gear (9) meshes with the gear ring (10), and the drive motor (8) drives the gear ring (10) and the hollow shaft (7) to rotate through the gear (9).

6. A low-carbon external combustion edge-driven three-cylinder rotary kiln device according to claim 5, characterized in that, An oil sump (11) is provided at the meshing point of the gear (9) and the gear ring (10) for lubricating and cooling the meshing position.

7. A low-carbon external combustion edge-drive three-cylinder rotary kiln device according to claim 4, characterized in that, The hollow shaft (7) is supported by rollers (12) at both ends for limiting the axial movement of the hollow shaft. The rollers (12) have a stop edge that cooperates with the hollow shaft (7) on the side close to the hollow shaft (7) to block the axial movement of the hollow shaft (7).

8. A low-carbon external combustion edge-drive three-cylinder rotary kiln device according to claim 4, characterized in that, One end of the hollow shaft (7) serves as a material inlet, and an inner cylinder (2) is formed between the material inlet and the partition plate (13) set inside the hollow shaft (7). On the other side of the partition plate (13), an end plate (15) set at the end of the hollow shaft (7) forms a cooling water chamber (14). The material passing through the area where the cooling water chamber (14) is located is cooled by the cooling water chamber (14).

9. A low-carbon external combustion edge-driven three-cylinder rotary kiln device according to claim 8, characterized in that, The cooling water chamber (14) has a groove along the wall at the end near the end plate (15) to form the inlet and outlet of cooling water. As the hollow shaft (7) rotates, cooling water flows in from the upper groove and flows out from the lower groove. A water receiving cone (5) is provided in the cooling water chamber (14) to guide the incoming cooling water to the ungrooved end. The tip of the water receiving cone (5) faces the side where the sealing plate is located.

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