A rotary kiln waste heat recovery device

Abstract

This utility model relates to the field of rotary kiln waste heat recovery technology, and discloses a rotary kiln waste heat recovery device, including: a kiln body and a rotary cylinder. The rotary cylinder is rotatably mounted inside the kiln body. A high-temperature waste gas outlet pipe is provided at the top of one end of the kiln body. A dust removal filter cylinder is provided at one end of the high-temperature waste gas outlet pipe. Waste heat waste gas guide pipes are provided on both sides of one end of the dust removal filter cylinder. One end of the waste heat waste gas guide pipe is connected to both sides of the kiln body. This utility model sets the introduction point of high-temperature flue gas on the side of the kiln, utilizing the characteristic that the density of high-temperature flue gas is less than that of air, promoting the smooth penetration of heat flow from bottom to top under the action of density difference, forming a stable and effective heat convection. This design ensures that the rotary cylinder of the kiln is uniformly heated within a 360° range, without any heating blind spots, guaranteeing the evenness of heating of the cylinder.

Description

Technical Field

[0001] This utility model relates to the field of rotary kiln waste heat recovery technology, specifically a rotary kiln waste heat recovery device. Background Technology

[0002] Rotary kilns are key thermal equipment widely used in many fields such as building materials, metallurgy, chemicals, and environmental protection. During operation, material enters the kiln from the tail (high end). Driven by the rotation and tilting of the kiln, the material moves slowly forward while exchanging heat thoroughly with the high-temperature hot airflow injected from the kiln head (lower end). During this movement, the material sequentially undergoes stages of drying, preheating, decomposition, firing, and cooling, ultimately completing its physical and chemical changes and being discharged from the kiln head.

[0003] For example, an existing Chinese patent (CN222761346U) discloses a rotary kiln, including a rotary kiln body, one end of which is a feeding end and the other end is a discharging end, with a receiving cavity formed inside the rotary kiln body; an oxygen-enriched air conveying pipe disposed inside the receiving cavity, with a gas conveying pipe formed inside the oxygen-enriched air conveying pipe, the gas conveying pipe being adapted to convey oxygen-enriched air into the receiving cavity, and multiple first nozzles formed on the oxygen-enriched air conveying pipe; and a pulverized coal conveying pipe disposed inside the receiving cavity, with a pulverized coal conveying pipe formed inside the pulverized coal conveying pipe, and multiple second nozzles formed on the pulverized coal conveying pipe. This increases the net calorific value of coal, reduces coal consumption, lowers production costs, and reduces flue gas volume.

[0004] During the continuous operation of a rotary kiln, a large amount of high-temperature waste gas is continuously emitted. This waste gas contains considerable waste heat resources with high utilization value. In conventional waste heat utilization methods, high-temperature flue gas is usually introduced from the top of the kiln. Because the density of high-temperature waste gas is lower than that of air, it is difficult to sink naturally after entering the kiln, making it impossible to form efficient and uniform heat convection. This results in extremely uneven heating of the kiln shell. To address this, a rotary kiln waste heat recovery device is provided. Utility Model Content

[0005] The purpose of this invention is to provide a rotary kiln waste heat recovery device to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a rotary kiln waste heat recovery device, comprising: a kiln body and a rotary cylinder, wherein the rotary cylinder is rotatably disposed inside the kiln body, a high-temperature waste gas outlet pipe is provided at the top of one end of the kiln body, a dust removal filter cylinder is provided at one end of the high-temperature waste gas outlet pipe, and waste heat waste gas guide pipes are provided on both sides of one end of the dust removal filter cylinder, one end of the waste heat waste gas guide pipe is connected to both sides of the kiln body, one end of the rotary cylinder is the feeding end and the other end is the discharging end, the feeding end is higher than the discharging end, the high-temperature waste gas outlet pipe is close to the discharging end, and one end of the waste heat waste gas guide pipe is close to the lower half of the feeding end.

[0007] Furthermore, the dust removal filter cylinder has a main shaft in the center, the inner wall of the dust removal filter cylinder has an exhaust gas filter screen, the outer wall of the main shaft has cleaning brushes on both sides of the exhaust gas filter screen, and a drive motor is provided on one side of the top of the kiln body. One end of the output shaft of the drive motor is fixed to one end of the main shaft.

[0008] Furthermore, a dust discharge housing is provided on one side of the bottom of the dust removal filter cartridge, and a sealing door is hinged to one side of the dust discharge housing.

[0009] Furthermore, there are multiple exhaust gas filter screens, which are arranged at equal intervals inside the dust removal filter cylinder.

[0010] Furthermore, the exhaust gas filter screen is rotatably connected to the main shaft.

[0011] Furthermore, the mesh diameter of the plurality of exhaust gas filters decreases sequentially from the high-temperature exhaust gas outlet pipe end to the waste heat exhaust gas guide pipe end.

[0012] Furthermore, a gearbox is provided between the drive motor and the main shaft.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] This invention, through the design of a waste heat exhaust gas guide pipe and a high-temperature exhaust gas outlet pipe, achieves the goal of introducing high-temperature flue gas onto the side of the kiln during waste heat recovery in rotary kilns. Utilizing the characteristic that high-temperature flue gas is less dense than air, heat flow is facilitated to smoothly penetrate from bottom to top under the influence of density difference, forming stable and effective heat convection. This design ensures that the kiln's rotating cylinder is uniformly heated within a 360° range, eliminating any heating blind spots and guaranteeing the evenness of heating within the cylinder.

[0015] In addition, before the high-temperature waste gas is recovered, the dust contained in the waste gas is filtered by the waste gas filter screen in the dust removal filter cartridge, which improves the heat exchange efficiency of waste heat utilization. At the same time, the cleaning brush is driven to rotate by the main shaft to avoid the waste gas filter screen from clogging.

[0016] The parts of the device not covered herein are the same as or can be implemented using existing technologies. Attached Figure Description

[0017] Figure 1 This is a perspective view of a rotary kiln waste heat recovery device according to the present invention;

[0018] Figure 2 This is a perspective view of a rotary kiln waste heat recovery device according to the present invention;

[0019] Figure 3 This is a main sectional view of a rotary kiln waste heat recovery device according to the present invention;

[0020] Figure 4 This is a top view of a rotary kiln waste heat recovery device according to the present invention.

[0021] In the diagram: 1. Kiln body; 2. Rotary cylinder; 3. High-temperature exhaust gas outlet pipe; 4. Dust removal filter cylinder; 5. Drive motor; 6. Gearbox; 7. Waste heat exhaust gas guide pipe; 8. Main shaft; 9. Exhaust gas filter screen; 10. Cleaning brush; 11. Dust discharge housing; 12. Sealing door. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0023] Please see Figures 1-4 This utility model provides a technical solution: a rotary kiln waste heat recovery device, comprising: a kiln body 1 and a rotary cylinder 2. The rotary cylinder 2 is rotatably mounted inside the kiln body 1. When the rotary kiln is working, the material enters the cylinder from the kiln tail (high end). Under the rotation and tilting action of the cylinder, the material moves slowly forward while fully exchanging heat with the high-temperature hot airflow injected from the kiln head (low end). During the movement, the material successively undergoes stages such as drying, preheating, decomposition, firing, and cooling, and finally completes physical and chemical changes before being discharged from the kiln head.

[0024] A high-temperature exhaust pipe 3 is provided at the top of one end of the kiln body 1. The high-temperature exhaust pipe 3 can promptly discharge the high-temperature exhaust gas generated in the kiln, preventing the exhaust gas from accumulating in the kiln and affecting the temperature distribution and material processing effect in the kiln. At the same time, it also provides a source of exhaust gas for subsequent waste heat recovery and utilization.

[0025] A dust removal filter cartridge 4 is installed at one end of the high-temperature exhaust gas outlet pipe 3. Before the exhaust gas enters the subsequent waste heat recovery process, the dust contained in the exhaust gas is filtered by the dust removal filter cartridge 4 to prevent dust from entering the waste heat recovery equipment and avoid dust accumulation in the equipment, thereby improving the heat exchange efficiency of waste heat utilization and extending the service life of the equipment.

[0026] The dust removal filter cylinder 4 is equipped with waste heat exhaust gas guide pipes 7 on both sides of one end. One end of the waste heat exhaust gas guide pipe 7 is connected to both sides of the kiln body 1, and the filtered high-temperature exhaust gas is introduced from the side of the kiln body. Taking advantage of the fact that the density of high-temperature exhaust gas is less than that of air, the heat flow is promoted to penetrate smoothly from bottom to top under the action of density difference, forming a stable and effective heat convection. This allows the rotating cylinder 2 of the kiln body to be heated evenly within a 360° range, without any heating blind spots, ensuring the uniformity of heating of the cylinder body, improving the waste heat recovery effect and the quality of material processing.

[0027] The rotary drum 2 has a feed end at one end and a discharge end at the other. The feed end is higher than the discharge end. The high-temperature exhaust gas outlet pipe 3 is located near the discharge end, and one end of the waste heat exhaust gas guide pipe 7 is located near the lower half of the feed end. The material enters from the higher feed end and moves towards the lower discharge end under gravity, which conforms to the material handling process. The high-temperature exhaust gas outlet pipe 3, located near the discharge end, can promptly discharge the high-temperature exhaust gas generated after the material is processed in the kiln. The waste heat exhaust gas guide pipe 7, located near the lower half of the feed end, allows the exhaust gas to enter from the lower side, which is reasonably coordinated with the material movement direction, better promotes heat convection, achieves uniform heating, and improves waste heat recovery efficiency.

[0028] A main shaft 8 is located in the center of the dust collector filter cartridge 4. An exhaust gas filter screen 9 is installed on the inner wall of the dust collector filter cartridge 4. The exhaust gas entering from the high-temperature exhaust gas outlet pipe 3 is filtered, effectively intercepting dust particles in the exhaust gas, preventing dust from entering subsequent waste heat recovery equipment, ensuring the normal operation of the waste heat recovery equipment, and improving heat exchange efficiency. Cleaning brushes 10 are located on both sides of the exhaust gas filter screen 9 on the outer wall of the main shaft 8. A drive motor 5 is located on one side of the top of the kiln body 1, with one end of the output shaft of the drive motor 5 fixed to one end of the main shaft 8. The main shaft 8 can drive the relevant components to operate stably within the dust collector filter cartridge 4, realizing functions such as cleaning the exhaust gas filter screen 9. The cleaning brushes 10 can clean the exhaust gas filter screen 9, promptly removing dust adhering to the filter screen, preventing clogging, ensuring the filtration effect and ventilation performance of the exhaust gas filter screen 9, and extending the service life of the filter screen. The drive motor 5 provides power to the main shaft 8, enabling the main shaft 8 to rotate stably, thereby driving the cleaning brushes 10 to clean the exhaust gas filter screen 9, ensuring the normal operation of the dust collector filter cartridge 4.

[0029] A dust collection housing 11 is located on one side of the bottom of the dust collector filter cartridge 4, and a sealing door 12 is hinged to one side of the dust collection housing 11. This door collects the dust swept off the exhaust gas filter screen 9 by the cleaning brush 10, facilitating centralized processing and preventing dust accumulation inside the dust collector filter cartridge 4, which could affect the normal operation of the equipment. When necessary, the sealing door 12 can be opened to clean the dust collected inside the dust collection housing 11. Simultaneously, when closed, the sealing door 12 ensures the airtightness of the dust collection housing 11, preventing exhaust gas leakage.

[0030] Multiple exhaust gas filters 9 are arranged equidistantly inside the dust collector filter cylinder 4. The mesh diameter of the multiple exhaust gas filters 9 decreases sequentially from the high-temperature exhaust gas outlet pipe 3 to the waste heat exhaust gas guide pipe 7. This improves the filtration effect on dust in the exhaust gas. Through multi-stage filtration, dust particles of different sizes can be more effectively intercepted, further ensuring the cleanliness of the exhaust gas entering the subsequent waste heat recovery equipment and improving waste heat recovery efficiency. A multi-stage filtration system is formed, with the first-stage filter intercepting larger dust particles, and subsequent filters gradually intercepting smaller particles, achieving graded filtration, improving filtration accuracy, more effectively protecting the subsequent waste heat recovery equipment, and simultaneously improving waste heat recovery efficiency.

[0031] The exhaust gas filter 9 is rotatably connected to the main shaft 8. When the main shaft 8 rotates to drive the cleaning brush 10 to clean the exhaust gas filter 9, the exhaust gas filter 9 can rotate relative to the main shaft 8 to a certain extent, reducing the frictional resistance between the cleaning brush 10 and the exhaust gas filter 9, reducing equipment wear, and also helping to improve the cleaning effect. A gearbox 6 is provided between the drive motor 5 and the main shaft 8. The gearbox 6 can adjust the output speed and torque of the drive motor 5, providing the main shaft 8 with a suitable speed and torque according to actual needs, ensuring that the main shaft 8 drives the cleaning brush 10 stably and efficiently, and also playing a certain role in buffering and protection, reducing the direct impact between the drive motor 5 and the main shaft 8.

[0032] In the waste heat recovery of the rotary kiln, the high-temperature flue gas is introduced at the side of the kiln. Utilizing the fact that the density of the high-temperature flue gas is less than that of air, the heat flow is facilitated to smoothly penetrate from bottom to top under the influence of the density difference, forming stable and effective heat convection. This design ensures that the rotary cylinder 2 of the kiln is uniformly heated within a 360° range, eliminating any heating blind spots and guaranteeing the evenness of the cylinder's heating.

[0033] In addition, before the high-temperature waste gas is recovered, the dust contained in the waste gas is filtered by the waste gas filter screen 8 in the dust removal filter cylinder 4, which improves the heat exchange efficiency of waste heat utilization. At the same time, the cleaning brush 10 is rotated by the main shaft 8 to avoid the waste gas filter screen 8 from clogging.

[0034] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

Claims

1. A rotary kiln waste heat recovery device, comprising: The kiln body (1) and the rotary cylinder (2) are characterized in that: the rotary cylinder (2) is provided inside the kiln body (1), a high temperature exhaust gas outlet pipe (3) is provided at the top of one end of the kiln body (1), a dust removal filter cylinder (4) is provided at one end of the high temperature exhaust gas outlet pipe (3), a waste heat exhaust gas guide pipe (7) is provided on both sides of one end of the dust removal filter cylinder (4), one end of the waste heat exhaust gas guide pipe (7) is connected to both sides of the kiln body (1), one end of the rotary cylinder (2) is the feeding end, the other end is the discharging end, the height of the feeding end is higher than the discharging end, the high temperature exhaust gas outlet pipe (3) is close to the discharging end, and one end of the waste heat exhaust gas guide pipe (7) is close to the lower half of the feeding end.

2. The rotary kiln waste heat recovery device according to claim 1, characterized in that: The dust removal filter cylinder (4) has a main shaft (8) in the center, and the inner wall of the dust removal filter cylinder (4) has a waste gas filter screen (9). The outer wall of the main shaft (8) is provided with cleaning brushes (10) on both sides of the waste gas filter screen (9). The top side of the kiln body (1) is provided with a drive motor (5), and one end of the output shaft of the drive motor (5) is fixed to one end of the main shaft (8).

3. The rotary kiln waste heat recovery device according to claim 2, characterized in that: The dust removal filter cartridge (4) has a dust discharge housing (11) on one side of its bottom, and a sealing door (12) is hinged to one side of the dust discharge housing (11).

4. The rotary kiln waste heat recovery device according to claim 2, characterized in that: There are multiple exhaust gas filter screens (9), and the multiple exhaust gas filter screens (9) are arranged at equal intervals inside the dust removal filter cylinder (4).

5. A rotary kiln waste heat recovery device according to claim 2, characterized in that: The exhaust gas filter (9) is rotatably connected to the main shaft (8).

6. The rotary kiln waste heat recovery device according to claim 4, characterized in that: The mesh diameter of the multiple exhaust gas filters (9) decreases sequentially from the high-temperature exhaust gas outlet pipe (3) to the waste heat exhaust gas guide pipe (7).

7. A rotary kiln waste heat recovery device according to claim 4, characterized in that: A gearbox (6) is provided between the drive motor (5) and the main shaft (8).

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