A material blocking device for the discharge port of a drying kiln

Abstract

The utility model relates to a kind of material blocking devices of drying kiln discharge port, including sealing cover and discharge component.Sealing cover includes cover body and material blocking component.Cover body is hollow and has air inlet, discharge port and exhaust port.Air inlet is directly opposite with drying kiln discharge port and is communicated.Discharge port is opened in the lower part of cover body.Exhaust port is opened in the upper part of cover body.Material blocking component has a material blocking surface.Material blocking component is fixedly arranged in cover body and is inclined downward, so that material blocking surface meets the gas discharged in exhaust port, guides gas to flow upwards and is discharged from exhaust port, and solid particles carried in gas are blocked by material blocking surface, and fall into discharge port under the action of gravity.Discharge component includes smoke pipe and induced draft fan.One end of smoke pipe is communicated with exhaust port, and the other end is communicated with induced draft fan.The utility model can avoid harmful air volume into induced draft fan and other subsequent equipment, ensure the normal work of induced draft fan, and then improve the airflow distribution in drying kiln, improve the heat exchange efficiency in drying kiln.

Description

Technical Field

[0001] This utility model relates to the technical field of drying kilns, and in particular to a material blocking device at the discharge port of a drying kiln. Background Technology

[0002] A drying kiln is a piece of equipment used for drying materials, widely used in industries such as building materials and metallurgy. It removes moisture from materials through heat transfer to meet production needs. Its working principle typically involves bringing the material into contact with a hot airflow inside the kiln; the moisture evaporates and is then discharged by an induced draft fan or other equipment. The selection of the induced draft fan and the design of the exhaust port significantly affect drying efficiency and material quality; for example, the fan's design airflow rate, air velocity, and the sealing devices at the exhaust point are crucial. Lateritic nickel ore is characterized by high viscosity, high moisture content, and small particle size after drying, making it easily drawn away by the induced draft fan. During production, the frequency of the induced draft fan is adjusted according to the moisture content of the lateritic nickel ore upon arrival to meet production requirements.

[0003] In the existing technology, the induced draft fan of the drying kiln draws air directly from the discharge port. When the frequency of the induced draft fan increases, the air velocity drawn from the discharge port to the induced draft fan will also increase. After the air velocity increases, a large amount of small particles of material coming out of the discharge port will be drawn into the dust collection box of the induced draft fan. At the same time, a large amount of harmful air will enter the induced draft fan from the discharge port, reducing the heat exchange rate. Utility Model Content

[0004] To solve the above-mentioned technical problems, this application provides a material blocking device at the discharge port of a drying kiln.

[0005] The material blocking device at the discharge port of the drying kiln provided by this utility model adopts the following technical solution:

[0006] A material-blocking device for the discharge port of a drying kiln includes a sealing cover and a discharge assembly. The sealing cover comprises a cover body and a material-blocking component. The cover body is hollow and has an air inlet, a material outlet, and an exhaust outlet. The air inlet is directly opposite to and communicates with the discharge port of the drying kiln. The material outlet is located at the lower part of the cover body. The exhaust outlet is located at the upper part of the cover body. The material-blocking component has a material-blocking surface. The material-blocking component is fixedly installed inside the cover body and tilted downwards so that the material-blocking surface faces the gas discharged from the exhaust outlet, guiding the gas upwards and discharging it from the exhaust outlet. Solid particles carried in the gas are blocked by the material-blocking surface and fall into the material outlet under gravity. The discharge assembly includes a flue pipe and an induced draft fan. One end of the flue pipe communicates with the exhaust outlet, and the other end communicates with the induced draft fan. The induced draft fan is used to extract air from inside the cover body.

[0007] Optionally, the discharge port of the drying kiln is the outlet of the roller of the roller conveyor; the cover is cylindrical, and the air inlet is located on one side of the axial direction of the cover; the cover is coaxially connected to the roller, and a part of the roller extends into the air inlet; a sealing element is provided on the inner wall of the air inlet; the sealing element is used for sealing between the outer wall of the roller and the inner wall of the air inlet.

[0008] Optionally, the baffle component is a baffle plate; the baffle plate is rectangular; one side of the baffle plate in the length or width direction is fixedly connected to the side of the cover opposite to the air inlet, and the other side is inclined downward and extends into the roller; the upper side of the baffle plate is the baffle surface.

[0009] Optionally, the angle at which the material stop component is tilted downward is between 15° and 40°.

[0010] Optionally, the baffle plate has both edges facing upwards in the diameter direction of the cover to form folded edges, so that the folded edges are spaced apart from the inner wall of the roller.

[0011] Optionally, the sealing cover further includes a main support beam; the main support beam is attached to the lower side of the baffle plate, and both ends are fixedly connected to the inner side of the cover.

[0012] Optionally, the sealing cover further includes a plurality of inclined support rods; the inclined support rods are all inclined and located below the baffle plate, one end of which is fixedly connected to the inner wall of the cover body, and the other end is fixedly connected to the lower side of the main support beam or the lower side of the baffle plate.

[0013] Optionally, the main support beam and the baffle plate are fully welded together.

[0014] Optionally, the emission assembly further includes a wet scrubber; the wet scrubber is disposed on the exhaust pipe and located upstream of the induced draft fan.

[0015] As described above, this utility model has at least the following beneficial effects:

[0016] 1. The material-blocking device at the discharge port of the drying kiln of this utility model is installed at the discharge port of the drying kiln. By setting a material-blocking component inside the hood, the gas discharged from the discharge port of the drying kiln flows to the material-blocking surface of the material-blocking component. Due to the blocking effect of the material-blocking surface, the solid particles carried in the gas are blocked by the material-blocking surface and cannot continue to slide down along the material-blocking surface with the gas flow, falling into the discharge port. The gas at the material-blocking surface then flows upward under the action of the induced draft fan and finally exits from the exhaust port. Compared with the prior art, this utility model can prevent harmful air volume from entering the induced draft fan and other subsequent equipment, ensuring the normal operation of the induced draft fan, thereby improving the airflow distribution in the drying kiln and increasing the heat exchange efficiency in the drying kiln.

[0017] 2. This utility model improves the deformation resistance of the baffle plate by fully welding the main support beam to the baffle plate and forming a triangular support structure with the diagonal support rod, which helps to extend the service life of this utility model and reduce the frequency of maintenance. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the material blocking device at the discharge port of the drying kiln.

[0019] Figure 2 This is a schematic diagram of the folded edge structure.

[0020] Figure 3 This is a schematic diagram of the main support beam and diagonal support rod structure.

[0021] Attached reference numerals: 1. Cover; 11. Air inlet; 12. Discharge outlet; 13. Exhaust outlet; 2. Baffle plate; 21. Baffle surface; 22. Folded edge; 3. Exhaust fan; 4. Smoke exhaust pipe; 5. Drum; 6. Main support beam; 7. Diagonal support rod; 8. Wet dust collector; 9. Chimney. Detailed Implementation

[0022] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. It should also be understood that the terminology used in the embodiments of this utility model is for describing specific implementation schemes and not for limiting the scope of protection of this utility model. Test methods in the following embodiments that do not specify specific conditions are generally performed under conventional conditions or according to the conditions recommended by the respective manufacturers.

[0023] It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings of this specification are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of implementation of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of this utility model, should still fall within the scope of the technical content disclosed in this utility model. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity of description and are not intended to limit the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of implementation of this utility model.

[0024] In existing technology, when the induced draft fan 3 draws material from the drying kiln, a large amount of material is drawn into the dust collector in front of the fan 3. This causes blockage of the air duct and accumulation of a large amount of sludge inside the dust collector, affecting the draft efficiency of the fan 3, reducing output, and frequently requiring shutdown for cleaning inside the dust collector. This increases the workload for workers, and personnel entering the dust collector also pose significant safety risks. Furthermore, a large volume of harmful air entering the induced draft fan 3 from the drying kiln outlet reduces the effective heat exchange temperature difference within the kiln, decreases heat utilization, affects drying quality, and wastes energy.

[0025] Please refer to Figures 1-3 To address the aforementioned problems, this utility model discloses a material-blocking device for the discharge port of a drying kiln, comprising a sealing cover and a discharge assembly. The sealing cover includes a cover body 1 and a material-blocking component. The cover body 1 is hollow and has an air inlet 11, a discharge port 12, and an exhaust port 13. The air inlet 11 is directly opposite to and communicates with the discharge port of the drying kiln. The discharge port 12 is located at the lower part of the cover body 1. The exhaust port 13 is located at the upper part of the cover body 1. The material-blocking component has a material-blocking surface 21. The material-blocking component is fixedly installed inside the cover body 1 and tilted downwards, so that the material-blocking surface 21 faces the gas discharged from the exhaust port 13, guiding the gas upwards and discharging it from the exhaust port 13. Solid particles carried in the gas are blocked by the material-blocking surface 21 and fall into the discharge port 12 under gravity. The discharge assembly includes a flue pipe 4 and an induced draft fan 3. One end of the flue pipe 4 is connected to the exhaust port 13, and the other end is connected to the induced draft fan 3. The induced draft fan 3 is used to extract air from inside the cover body 1.

[0026] The working principle of this device is as follows: the gas discharged from the outlet of the drying kiln flows onto the baffle surface 21 of the baffle component. Due to the blocking effect of the baffle surface 21, the solid particles carried in the gas are blocked by the baffle surface 21, and the airflow velocity decreases at the baffle plate 2, preventing the solid particles from continuing to flow with the gas and causing them to slide down along the baffle surface 21 and fall into the discharge port 12. The gas at the baffle surface 21 then flows upward under the action of the induced draft fan 3 and is finally discharged from the exhaust port 13. In this way, harmful airflow is prevented from entering the induced draft fan 3 and other subsequent equipment, ensuring the normal operation of the induced draft fan 3, thereby improving the airflow distribution in the drying kiln and increasing the heat exchange efficiency in the drying kiln.

[0027] The discharge port of the drying kiln is typically the outlet of roller 5 on the conveyor belt. Roller 5 is cylindrical and rotates continuously. Therefore, when the discharge port of the drying kiln is the outlet of roller 5, the cover 1 cannot be fixedly connected to roller 5. In this case, the cover 1 is cylindrical, and the air inlet 11 is located on one side of the axial direction of the cover 1. The cover 1 is coaxially sleeved on roller 5, and a portion of roller 5 extends into the air inlet 11. A seal is provided on the inner wall of the air inlet 11. The seal is used to seal between the outer wall of roller 5 and the inner wall of air inlet 11.

[0028] Specifically, the sealing element consists of multiple sealing discs (not shown in the figure). One side of the sealing disc is hinged to the inner wall of the air inlet 11, or the sealing disc is elastic and its other side is fixedly connected to the inner wall of the air inlet 11, while the other side of the sealing disc contacts the outer wall of the roller 5. The multiple sealing discs are evenly arranged around the circumference of the air inlet 11, and there is a partial overlap between adjacent sealing discs, so that the sealing discs can cover the gap between the outer wall of the roller 5 and the inner wall of the air inlet 11, thus achieving a seal. Furthermore, because the sealing discs are hinged to the inner wall of the air inlet 11 or are elastic, the sealing discs do not hinder the rotation of the roller 5.

[0029] In some other embodiments of this utility model, if the discharge port of the drying kiln is the outlet of a stationary component, the air inlet 11 and the discharge port of the drying kiln can be sealed by a sealing ring or other component, or the air inlet 11 can be connected to the discharge port of the drying kiln by welding, so as to completely block the gap between the air inlet 11 and the discharge port of the drying kiln.

[0030] Please continue to refer to Figure 1 The baffle component is a baffle plate 2. The baffle plate 2 is rectangular. One side of the baffle plate 2 in the length or width direction is fixedly connected to the side of the cover 1 opposite to the air inlet 11, and the other side is inclined downward and extends into the roller 5. The upper side of the baffle plate 2 is the baffle surface 21.

[0031] Specifically, in this embodiment, one side of the baffle plate 2 along its length is fixedly connected to the inner wall of the cover 1 on the side opposite to the air inlet 11, while the other side slopes downward and extends into the roller 5. It is readily apparent that the width of the baffle plate 2 is parallel to the diameter of the cover 1. The width of the baffle plate 2 is matched to the inner diameter of the roller 5: the width of the baffle plate 2 is as large as possible to ensure that it can block most of the solid particles, while the two sides of the baffle plate 2 in the width direction do not interfere with the inner wall of the roller 5; otherwise, the baffle plate 2 will deform, and the inner wall of the roller 5 will be scratched. Please refer to... Figure 2 In a preferred embodiment of the present invention, in order to reduce the interference between the inner wall of the roller 5 and the baffle plate 2, both edges of the baffle plate 2 in the diameter direction of the cover 1 are raised to form folded edges 22, so that the folded edges 22 and the inner wall of the roller 5 are kept apart.

[0032] If the downward tilt angle of the baffle plate 2 is too small, some solid particles in the airflow may not be completely blocked by the baffle plate 2 and will continue to enter the air outlet with the airflow, still causing blockage of the dust collector. If the downward tilt angle of the baffle plate 2 is too large, although the solid particles in the airflow are completely blocked, the resistance encountered by the airflow at the baffle plate 2 will increase as the downward tilt angle of the baffle plate 2 increases. This requires the induced draft fan 3 to operate with greater power to successfully draw in the air, thus increasing the drying energy consumption. Therefore, preferably, the downward tilt angle of the baffle component is between 15° and 40°, such as 15°, 20°, 25°, 30°, 35°, and 40°.

[0033] In other embodiments of this utility model, the baffle component can also be a component of other suitable shape, as long as it has a baffle surface 21 that is far from the same baffle surface 21 as the baffle plate 2. In other words, any technical solution that uses a baffle component with the same principle as the baffle plate 2 of this utility model to block solid particles in the gas discharged from the outlet of the drying kiln is within the protection scope of this utility model.

[0034] Please refer to Figure 1 , Figure 3 If the baffle plate 2 is only fixedly connected to the inner wall of the cover 1 via one edge, its tilt angle may gradually increase due to its own weight and airflow impact, exceeding a reasonable range. To prevent the baffle plate 2 from tilting downwards due to its own weight and airflow, the sealing cover also includes a main support beam 6. The main support beam 6 is attached to the lower side of the baffle plate 2, and both ends are fixedly connected to the inner side of the cover 1. Specifically, the longitudinal section of the main support beam 6 is rectangular, and its two ends are welded and fixed to the inner wall of the cover 1. One side abuts against the bottom surface of the baffle plate 2 to support the baffle plate 2. The main support beam 6 can also be of other shapes, as long as it can support the baffle plate 2, which will not be elaborated here.

[0035] In a preferred embodiment of this utility model, in addition to the two ends of the main support beam 6 being fixedly connected to the inner side of the cover 1, the main support beam 6 is fully welded to the baffle plate 2, which further improves the firmness of the connection between the main support beam 6 and the baffle plate 2.

[0036] To further reduce the downward tilt angle of the baffle plate 2, the sealing cover also includes multiple inclined support rods 7. Each inclined support rod 7 is inclined and located below the baffle plate 2, with one end fixedly connected to the inner wall of the cover 1 and the other end fixedly connected to the lower side of the main support beam 6 or the lower side of the baffle plate 2. The inclined support rods 7, the main support beam 6, and the inner wall of the cover 1 form a triangular structure, firmly supporting the baffle plate 2. The number of inclined support rods 7 can be reasonably selected according to the size of the baffle plate 2.

[0037] In some other embodiments of this utility model, the inclined support rod 7 can also replace the main support beam 6 to support the baffle plate 2 alone.

[0038] The emission assembly also includes a wet scrubber 8. The wet scrubber 8 is installed on the exhaust pipe 4 and located upstream of the induced draft fan 3. By installing the wet scrubber 8 upstream of the induced draft fan 3, solid particles carried in the exhaust gas can be further removed. These solid particles are smaller in size and weight than those blocked at the baffle plate 2, and have less impact on the induced draft fan 3. However, further removal of these solid particles by the wet scrubber 8 better protects the induced draft fan 3. The outlet of the induced draft fan 3 can be connected to the chimney 9 via the exhaust pipe 4 to discharge the gas drawn in by the induced draft fan 3.

[0039] The material-blocking device at the discharge port of the drying kiln of this invention is installed at the discharge port of the drying kiln. By setting a material-blocking component inside the cover 1, the gas discharged from the discharge port of the drying kiln flows onto the material-blocking surface 21 of the material-blocking component. Due to the blocking effect of the material-blocking surface 21 and the reduced airflow velocity at the baffle plate 2, the solid particles carried in the gas are blocked by the material-blocking surface 21 and cannot continue to slide down along the material-blocking surface 21 with the gas flow, falling into the discharge port 12. The gas at the material-blocking surface 21 then flows upward under the action of the induced draft fan 3 and is finally discharged from the exhaust port 13. Compared with the prior art, this invention can prevent harmful airflow from entering the induced draft fan 3 and other subsequent equipment, ensuring the normal operation of the induced draft fan 3, thereby improving the airflow distribution in the drying kiln and increasing the heat exchange efficiency in the drying kiln.

[0040] Furthermore, by fully welding the main support beam 6 to the baffle plate 2 and forming a triangular support structure with the inclined support rod 7, this utility model improves the deformation resistance of the baffle plate 2, which helps to extend the service life of this utility model and reduce the frequency of maintenance.

[0041] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A material-blocking device at the discharge port of a drying kiln, characterized in that: Includes a sealing cover and an emission assembly; among which, The sealing cover includes a cover body (1) and a baffle component; The cover (1) is hollow and has an air inlet (11), a discharge port (12) and an exhaust port (13); the air inlet (11) is directly opposite to and connected to the discharge port of the drying kiln; the discharge port (12) is located at the lower part of the cover (1); the exhaust port (13) is located at the upper part of the cover (1). The baffle component has a baffle surface (21); the baffle component is fixedly installed inside the cover (1) and tilted downward so that the baffle surface (21) faces the gas discharged from the exhaust port (13) and guides the gas to flow upward and be discharged from the exhaust port (13). The solid particles carried in the gas are blocked by the baffle surface (21) and fall into the discharge port (12) under the action of gravity. The emission assembly includes a smoke exhaust pipe (4) and an exhaust fan (3); one end of the smoke exhaust pipe (4) is connected to the exhaust port (13), and the other end is connected to the exhaust fan (3); the exhaust fan (3) is used to extract air from the hood (1).

2. The material blocking device at the discharge port of the drying kiln according to claim 1, characterized in that: The discharge port of the drying kiln is the outlet of the drum (5) of the drum (5) conveyor; The cover (1) is cylindrical, and the air inlet (11) is located on one side of the axial direction of the cover (1); the cover (1) is coaxially sleeved on the roller (5), and a part of the roller (5) extends into the air inlet (11); The inner wall of the air inlet (11) is provided with a sealing element; the sealing element is used to seal between the outer wall of the roller (5) and the inner wall of the air inlet (11).

3. The material blocking device at the discharge port of the drying kiln according to claim 2, characterized in that: The material-blocking component is a material-blocking plate (2); the material-blocking plate (2) is rectangular; One side of the baffle plate (2) in the length or width direction is fixedly connected to the side of the cover (1) opposite to the air inlet (11), and the other side is inclined downward and extends into the roller (5); The upper side of the baffle plate (2) is the baffle surface (21).

4. The material blocking device at the discharge port of the drying kiln according to claim 3, characterized in that: The downward tilt angle of the baffle component is between 15° and 40°.

5. The material blocking device at the discharge port of the drying kiln according to claim 3, characterized in that: The baffle plate (2) has two edges that curve upwards in the diameter direction of the cover (1) to form folded edges (22), so that the folded edges (22) are spaced apart from the inner wall of the roller (5).

6. The material blocking device at the discharge port of the drying kiln according to claim 3, characterized in that: The sealing cover also includes a main support beam (6); The main support beam (6) is attached to the lower side of the baffle plate (2), and both ends are fixedly connected to the inner side of the cover (1).

7. The material blocking device at the discharge port of the drying kiln according to claim 6, characterized in that, The sealing cover also includes multiple inclined support rods (7); The inclined support rods (7) are all inclined and located below the baffle plate (2). One end of each rod is fixedly connected to the inner wall of the cover (1), and the other end is fixedly connected to the lower side of the main support beam (6) or the lower side of the baffle plate (2).

8. The material blocking device at the discharge port of the drying kiln according to claim 7, characterized in that: The main support beam (6) is fully welded to the baffle plate (2).

9. The material blocking device at the discharge port of the drying kiln according to claim 1, characterized in that, The emission assembly also includes a wet scrubber (8); The wet dust collector (8) is installed on the exhaust pipe (4) and is located upstream of the induced draft fan (3).

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