Anti-blocking temperature control type drying rotary kiln inner cylinder

Abstract

The utility model discloses a kind of anti-stuffing temperature control type drying rotary kiln inner tube, belong to rotary kiln equipment technical field, including rotary kiln outer cylinder and the inner tube of being set in rotary kiln outer cylinder inside close to fire nozzle one end;The ratio of inner tube diameter and rotary kiln outer cylinder diameter is 1:2, inner tube length is 1.5 times of rotary kiln outer cylinder diameter, and inner tube inside forms the combustion chamber of flame complete combustion;Inner tube is fixed by welding with rotary kiln outer cylinder inner wall through 3-4 evenly distributed support, and inner tube material is high-temperature stainless steel;The utility model can make the wind speed of fire nozzle place to 2.5 times, promote natural gas to burn fully, realize energy saving and consumption reduction;Block outer flame contact material, accurate temperature control;Prevent material dust blocking, guarantee rotary kiln stable operation, structure is stable, easily implemented.

Description

Technical Field

[0001] This utility model belongs to the technical field of rotary kiln equipment, and relates to an anti-clogging material control temperature-controlled drying rotary kiln inner cylinder. Background Technology

[0002] In the production process of drying or roasting materials, rotary kilns with self-made burner-in-place combustion are commonly used equipment. Traditional rotary kilns do not have an inner cylinder, which has the following problems: First, the air velocity at the burner is low, resulting in insufficient mixing of natural gas and air, which easily leads to incomplete combustion, increasing energy consumption and wasting energy; second, the outer flame of the flame is in direct contact with the material, which can easily cause the material to overheat, triggering irreversible chemical changes and making precise temperature control impossible; third, material dust easily spreads towards the burner, causing the burner to become clogged, which in turn causes blockage of the natural gas combustion port, affecting the normal operation of the rotary kiln.

[0003] To address the aforementioned issues, while existing technologies have attempted to add a cylinder to the rotary kiln, most of these cylinders have unreasonable dimensions, making it impossible to achieve complete combustion of the flame. Furthermore, they do not consider the synergistic effect of preventing material blockage and controlling temperature, resulting in poor structural stability and difficulty in meeting actual production needs. Therefore, in order to solve the aforementioned technical problems, the technical solution of this application has been developed. Utility Model Content

[0004] The purpose of this utility model is to provide an anti-clogging and temperature-controlled inner cylinder for a rotary kiln, which solves the problems of incomplete combustion, material overheating, and burner blockage caused by the lack of an inner cylinder in traditional rotary kilns, while ensuring structural stability and ease of implementation.

[0005] The technical solution adopted in this utility model is as follows: A temperature-controlled drying rotary kiln inner cylinder for preventing material blockage includes an outer cylinder of the rotary kiln and an inner cylinder disposed inside the outer cylinder near the burner. The diameter of the inner cylinder is 1:2 to the diameter of the outer cylinder, and the length of the inner cylinder is 1.5 times the diameter of the outer cylinder. One end of the inner cylinder is the air inlet near the burner, and the other end is the air outlet away from the burner. A combustion chamber for complete combustion of the flame is formed inside the inner cylinder.

[0006] The working principle of this utility model is as follows: Combustion optimization and energy saving principle: The inner cylinder diameter is designed to be 1:2 with the outer cylinder diameter of the rotary kiln. According to the principle of fluid mechanics, under the same air intake, the cross-sectional area of ​​the airflow inside the inner cylinder is only 1 / 4 of the corresponding area of ​​the outer cylinder of the rotary kiln. The airflow velocity is inversely proportional to the cross-sectional area. Therefore, the wind speed at the burner is increased to 2.5 times that when the inner cylinder is not installed. The higher wind speed can drive the natural gas and air to mix fully, so that the flame can burn completely inside the inner cylinder (the combustion chamber with a length of 1.5 times the diameter of the outer cylinder of the rotary kiln), reducing the waste of unburned natural gas. At the same time, the relatively closed combustion space formed by the inner cylinder can reduce the amount of external cold air entering, reduce heat loss, and thus increase the overall temperature of the rotary kiln, achieving energy saving and consumption reduction.

[0007] Temperature control principle: After the flame completes combustion inside the inner cylinder, the high-temperature outer flame is concentrated in the combustion chamber of the inner cylinder. By the time the flame is discharged from the gas outlet of the inner cylinder, the temperature of the outer flame has decreased. Furthermore, the inner cylinder wall can prevent the outer flame from directly contacting the material inside the outer cylinder of the rotary kiln, thus avoiding local overheating of the material. The inner cylinder facilitates reduced heat loss, making the temperature distribution inside the rotary kiln more uniform. This enables precise control of the material drying or roasting temperature and prevents irreversible chemical changes in the material due to overheating.

[0008] Anti-clogging principle: The inner cylinder is located at the end of the outer cylinder of the rotary kiln near the burner, forming a physical barrier. The dust generated by the material tumbling in the rotary kiln will be blocked by the inner cylinder and will not spread towards the burner, thus preventing dust from entering the burner and causing blockage. This prevents the natural gas combustion port from being blocked, ensures normal gas supply and combustion of the burner, and guarantees the continuous and stable operation of the rotary kiln.

[0009] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are: 1. A temperature-controlled drying rotary kiln inner cylinder with anti-clogging properties, wherein the inner cylinder is designed with a diameter ratio of 1:2 to that of the outer cylinder of the rotary kiln, and the length of the inner cylinder is 1.5 times the diameter of the outer cylinder of the rotary kiln. This increases the wind speed at the burner to 2.5 times that when the inner cylinder is not installed, promotes the full mixing and combustion of natural gas and air, reduces the amount of cold air entering, reduces energy consumption, and increases the overall temperature of the rotary kiln, thereby achieving energy saving and consumption reduction.

[0010] 2. The inner cylinder of this utility model can prevent the outer flame of the flame from directly contacting the material, avoid the material from overheating during the drying or roasting process, prevent irreversible chemical changes in the material, facilitate precise temperature control, and ensure material quality.

[0011] 3. The inner cylinder of this utility model can prevent material dust from spreading towards the burner, effectively avoiding material blockage in the burner and blockage in the natural gas combustion port, and ensuring the continuous and stable operation of the rotary kiln.

[0012] 4. The inner cylinder of this utility model is fixedly connected to the outer cylinder of the rotary kiln through support members. The support members are evenly distributed and fixed by welding, making the structure stable and reliable. The inner cylinder helps to reduce heat loss and further improves the energy-saving effect. The inner cylinder is made of high-temperature resistant stainless steel to ensure its service life in high-temperature environments. The overall structure is easy to implement and highly practical. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort, wherein: Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the axial structure of this utility model; The markings in the diagram are: 1-outer cylinder of rotary kiln, 2-burner, 3-inner cylinder, 4-support component. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model; that is, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The components of the embodiments of the present utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0015] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0016] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0017] The features and performance of this utility model will be further described in detail below with reference to the embodiments.

[0018] Example 1 This utility model relates to an anti-clogging, temperature-controlled drying rotary kiln inner cylinder, such as... Figure 1 , Figure 2 As shown, it includes an outer cylinder 1 of a rotary kiln and an inner cylinder 3 disposed inside the outer cylinder 1 near the burner 2; the ratio of the diameter of the inner cylinder 3 to the diameter of the outer cylinder 1 of the rotary kiln is 1:2, and the length of the inner cylinder 3 is 1.5 times the diameter of the outer cylinder 1 of the rotary kiln; one end of the inner cylinder 3 is the air inlet end near the burner 2, and the other end is the air outlet end away from the burner 2, and a combustion chamber is formed inside the inner cylinder 3 to allow the flame to burn completely.

[0019] The inner cylinder 3 is fixedly connected to the inner wall of the outer cylinder 1 of the rotary kiln by at least three support members 4, and the support members 4 are evenly distributed along the circumference of the inner cylinder 3.

[0020] The number of support members 4 is 3-4, and the included angle between two adjacent support members 4 is 90°-120°.

[0021] The ratio of the diameter of the air inlet end of the inner cylinder 3 to the diameter of the inner cylinder 3 is 1:1.2. The edge of the air inlet end is provided with a rounded chamfer to form a funnel mouth with a concentrating effect, so that most of the cold air entering the kiln gathers in the inner cylinder and forms uniform hot air after combustion.

[0022] The inner cylinder 3 is made of high-temperature resistant stainless steel, specifically type 310S.

[0023] The material of the support member 4 is the same as that of the inner cylinder 3. One end of the support member 4 is welded and fixed to the outer wall of the inner cylinder 3, and the other end is welded and fixed to the inner wall of the outer cylinder 1 of the rotary kiln.

[0024] The specific implementation method of this embodiment is as follows: an anti-blocking material temperature-controlled rotary kiln inner cylinder for ore drying. This embodiment is designed for an ore drying scenario, and the specific structural parameters are as follows: The outer cylinder diameter of the rotary kiln is 2.0m, therefore the inner cylinder diameter is 1.0m (1:2 ratio), and the inner cylinder length is 3.0m (1.5×2.0m). The inner cylinder is made of 310S high-temperature resistant stainless steel with a thickness of 8mm, ensuring stable use in the 120-180℃ environment of ore drying. There are 3 support components, made of the same material as the inner cylinder (310S stainless steel). The cross-section of the support component is rectangular (50mm wide and 10mm thick). The included angle between adjacent support components is 120°. One end of the support component is welded to the outer wall of the inner cylinder, and the other end is welded to the inner wall of the outer cylinder of the rotary kiln. The welding points adopt a full welding process to ensure a firm connection. The diameter of the air inlet port of the inner cylinder is 0.83m (1:1.2 ratio), and the chamfer radius of the port edge is 5mm to reduce the resistance when the airflow enters; In actual use, this embodiment increases the wind speed at the burner from 10m / s to 25m / s, improving natural gas combustion efficiency by 18% and reducing natural gas consumption per ton of ore drying from 8m³ to 6.6m³, resulting in significant energy savings. The ore drying temperature remains stable at 150±5℃ with no local overheating, and the time required to reduce the ore moisture content from 20% to 5% is shortened by 15%. After 30 days of continuous operation, there is no material blockage at the burner, and the stability of the rotary kiln operation is improved.

[0025] Example 2 This utility model relates to an anti-clogging, temperature-controlled drying rotary kiln inner cylinder, such as... Figure 1 , Figure 2 As shown, the specific implementation method of this embodiment is as follows: Inner cylinder of a temperature-controlled drying rotary kiln for ceramic body firing with anti-clogging material This embodiment is designed for the scenario of ceramic body firing (requiring precise temperature control and high temperature resistance), and the specific structural parameters are as follows: The outer cylinder diameter of the rotary kiln is 1.6m, therefore the inner cylinder diameter is 0.8m (1:2 ratio), and the inner cylinder length is 2.4m (1.5×1.6m). The inner cylinder is made of 310S high-temperature resistant stainless steel with a thickness of 10mm. The high temperature resistance of 310S stainless steel can reach 1200℃, which meets the high-temperature environment requirements of 800-1000℃ for ceramic blank firing. There are 4 support components, made of the same material as the inner cylinder (310S stainless steel). The cross-section of the support component is trapezoidal (top base 40mm, bottom base 60mm, thickness 12mm). The included angle between adjacent support components is 90°. The connection between the support component and the inner cylinder and the outer cylinder of the rotary kiln is made by argon arc welding. After welding, flaw detection is performed to ensure that there are no welding defects. The diameter of the air inlet port of the inner cylinder is 0.67m (1:1.2 ratio), and the chamfer radius of the port edge is 8mm, which further reduces the impact and resistance of high-temperature airflow; In actual use, the wind speed at the burner was increased to 28 m / s, the natural gas combustion rate reached 99%, and the energy consumption for ceramic blank firing was reduced by 20%. The firing temperature was controlled at 850±3℃, and there was no overheating cracking of the blank. The pass rate of the ceramic blank increased from 88% to 96%. After 45 days of continuous operation, the burner was not clogged, the number of rotary kiln shutdowns for maintenance was reduced, and the production efficiency was increased by 12%.

[0026] The above description is only a preferred embodiment of the present utility model and is not intended to limit the scope of protection of the present utility model. Any modifications, equivalent substitutions and improvements made by those skilled in the art within the spirit and principles of the present utility model should be included within the scope of protection of the present utility model.

Claims

1. An anti-clogging, temperature-controlled drying rotary kiln inner cylinder, characterized in that: It includes an outer cylinder (1) of a rotary kiln and an inner cylinder (3) located inside the outer cylinder (1) near the burner (2); the diameter of the inner cylinder (3) is 1:2 to the diameter of the outer cylinder (1) of the rotary kiln, and the length of the inner cylinder (3) is 1.5 times the diameter of the outer cylinder (1) of the rotary kiln; one end of the inner cylinder (3) is the air inlet end near the burner (2), and the other end is the air outlet end away from the burner (2), and a combustion chamber for complete combustion of the flame is formed inside the inner cylinder (3).

2. The inner cylinder of a temperature-controlled, anti-clogging drying rotary kiln according to claim 1, characterized in that: The inner cylinder (3) is fixedly connected to the inner wall of the outer cylinder (1) of the rotary kiln by at least three support members (4), and the support members (4) are evenly distributed along the circumference of the inner cylinder (3).

3. The inner cylinder of a temperature-controlled drying rotary kiln for preventing material blockage as described in claim 2, characterized in that: The number of the support members (4) is 3-4, and the included angle between two adjacent support members (4) is 90°-120°.

4. The inner cylinder of a temperature-controlled drying rotary kiln for preventing material blockage as described in claim 1 or 2, characterized in that: The ratio of the diameter of the port of the air inlet of the inner cylinder (3) to the diameter of the inner cylinder (3) is 1:1.

2. The port edge of the air inlet is provided with a rounded chamfer to form a funnel mouth with a concentrating effect, so that most of the cold air entering the kiln gathers in the inner cylinder to form uniform hot air after combustion.

5. The inner cylinder of a temperature-controlled drying rotary kiln for preventing material blockage as described in any one of claims 1-3, characterized in that: The inner cylinder (3) is made of high-temperature resistant stainless steel, and the high-temperature resistant stainless steel is of type 310S.

6. The inner cylinder of a temperature-controlled drying rotary kiln for preventing material blockage as described in claim 2 or 3, characterized in that: The material of the support member (4) is the same as that of the inner cylinder (3). One end of the support member (4) is welded and fixed to the outer wall of the inner cylinder (3), and the other end is welded and fixed to the inner wall of the outer cylinder (1) of the rotary kiln.

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