Drying kiln

Abstract

The utility model relates to the technical field of calcining equipment, and provides a drying kiln which comprises a feeding hopper, a rotary kiln body, a heat exchange core body and a discharging bin. The rotary kiln body is obliquely arranged, and the heat exchange core body is arranged in the rotary kiln body in a penetrating mode. A material channel is formed between the rotary kiln body and the heat exchange core body, a fluid channel is formed in the heat exchange core body, and high-temperature fluid is introduced into the fluid channel; the feeding hopper is arranged at the kiln head of the rotary kiln body and conveys powdery raw materials into the material channel. The heat exchange core body is used for realizing heat exchange between the high-temperature fluid in the fluid channel and the powdery raw material in the material channel so as to dry the powdery raw material; the discharging bin is arranged at the kiln tail of the rotary kiln body and collects the dried powdery raw materials output from the material channel. According to the drying kiln, the powdery raw materials can be dried conveniently, the problem that the dried powdery raw materials and high-temperature fluid need to be separated in an existing drying kiln is solved, and the situation that the dried materials overflow in the working process of the drying kiln can be effectively avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to calcining equipment technical field especially relates to a drying kiln. BACKGROUND

[0002] When the powder material such as gypsum, lime and the like is dried, the powder material and high-temperature flue gas are usually introduced into the drying kiln at the same time, and the powder material is dried under the heating of the high-temperature flue gas. It is found in practical application that the existing drying kiln is designed unreasonably, and the powder material is mostly dried in the environment where the high-temperature flue gas is located. After drying is completed, the dehydrated material will appear the phenomenon of weight loss suspension in the flue gas under the action of wind pressure, and the dried powder material is difficult to separate from the flue gas, and will overflow in the rotating gap at the kiln head and the kiln tail of the drying kiln, causing great pollution to the working environment. SUMMARY

[0003] The utility model provides a drying kiln to at least solve or improve the problem that the existing drying kiln is difficult to realize the separation of the dried powder material from the flue gas, and the powder material overflows.

[0004] The utility model provides a drying kiln, it includes: hopper, rotary kiln body, heat exchange core and discharge bin,

[0005] The rotary kiln body is arranged obliquely, the heat exchange core is arranged in the rotary kiln body, and the heat exchange core is configured to rotate synchronously or at different speeds along the same rotation direction as the rotary kiln body;

[0006] A material channel is formed between the rotary kiln body and the heat exchange core, a fluid channel is formed in the heat exchange core, and the fluid channel is used to introduce high-temperature fluid;

[0007] The hopper is arranged at the kiln head of the rotary kiln body and is configured to deliver the powder material into the material channel; the heat exchange core is used to realize heat exchange between the high-temperature fluid in the fluid channel and the powder material in the material channel to dry the powder material; and the discharge bin is arranged at the kiln tail of the rotary kiln body and is configured to collect the dried powder material output from the material channel.

[0008] According to the drying kiln provided by the utility model, the inner wall of the rotary kiln body is provided with a scoop plate, the scoop plate extends to the peripheral wall of the heat exchange core, and the scoop plate is used to move the powder material along the circumference of the heat exchange core during rotation of the rotary kiln body.

[0009] According to the drying kiln provided by the utility model, the scoop plate extends along the axial direction of the rotary kiln body, or the scoop plate extends along a helical trajectory relative to the rotary axis of the rotary kiln body.

[0010] According to the drying kiln, the heat exchange core body comprises a heat conduction cylinder body, the heat conduction cylinder body is arranged along the rotation axis of the rotary kiln body, the cross section shape of the heat conduction cylinder body along the plane perpendicular to the rotation axis is star-shaped, and the fluid channel is formed in the heat conduction cylinder body.

[0011] According to the drying kiln, the two ends of the heat conduction cylinder body are formed with adapters, the adapters are communicated with the fluid channel, and the adapters are further rotationally connected with fixed pipelines.

[0012] According to the drying kiln, the heat exchange core body further comprises a center pipe, the center pipe is inserted into the heat conduction cylinder body, and the fluid channel is formed between the inner wall of the heat conduction cylinder body and the peripheral wall of the center pipe.

[0013] According to the drying kiln, the peripheral wall of the heat conduction cylinder body is connected with the inner wall of the rotary kiln body.

[0014] According to the drying kiln, the heat conduction cylinder body and the rotary kiln body are separated from each other, and the heat conduction cylinder body is rotationally arranged in the rotary kiln body.

[0015] According to the drying kiln, the rotary kiln body comprises a cylindrical kiln body, a rotary support and a rotary driving assembly.

[0016] The cylindrical kiln body is arranged in an inclined manner, the cylindrical kiln body is rotationally arranged on the rotary support, the rotary driving assembly is connected with the cylindrical kiln body, so as to drive the cylindrical kiln body to rotate on the rotary support.

[0017] The first end of the cylindrical kiln body is configured to be rotationally connected with a kiln head support, the second end of the cylindrical kiln body is rotationally connected with the discharge bin, the heat exchange core body is arranged in the cylindrical kiln body, and the two ends of the heat exchange core body are arranged outside the cylindrical kiln body.

[0018] According to the drying kiln, the rotary driving assembly comprises a driving motor, a gear assembly and a gear ring, the driving motor is drivingly connected with the gear ring through the gear assembly, and the gear ring is sleeved with the peripheral wall of the cylindrical kiln body.

[0019] The drying kiln provided by this utility model, by setting a heat exchange core in the rotary kiln body, forms a material channel between the rotary kiln body and the heat exchange core, so that the high-temperature fluid flows along the fluid channel in the heat exchange core, while the powdered raw material input from the feed hopper flows along the material channel. The powdered raw material and the high-temperature fluid are isolated from each other and can perform indirect heat exchange based on the heat exchange core. This design can use the heat of the high-temperature fluid to dry the powdered raw material under normal pressure. The dried powdered raw material can be directly collected in the discharge bin, overcoming the problem of separating the dried powdered raw material and the high-temperature fluid in existing drying kilns. It can also effectively prevent the dried material from overflowing at the kiln head and kiln tail during the operation of the drying kiln, thereby effectively preventing air pollution in the working environment of the drying kiln. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is one of the structural schematic diagrams of the drying kiln provided by this utility model.

[0022] Figure 2 This is the second schematic diagram of the drying kiln provided by this utility model.

[0023] Figure 3 This is one of the structural schematic diagrams of the heat exchange core provided by this utility model.

[0024] Figure 4 This is the second structural schematic diagram of the heat exchange core provided by this utility model.

[0025] Figure 5 This is the third schematic diagram of the heat exchange core provided by this utility model.

[0026] Figure label:

[0027] 1. Rotary kiln body; 101. Material passage; 11. Cylindrical kiln body; 111. Scoop plate; 12. Rotary support; 13. Rotary drive assembly; 131. Drive motor; 132. Gear assembly; 133. Gear ring; 2. Heat exchange core; 201. Fluid passage; 21. Heat-conducting cylinder; 22. Adapter; 23. Central tube; 3. Feed hopper; 4. Discharge bin. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. 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.

[0029] The following is combined with Figures 1-5 The drying kiln provided in the utility model embodiment will be described in detail through specific embodiments and application scenarios.

[0030] like Figure 1 and Figure 2 As shown, this utility model embodiment provides a drying kiln, including: a feeding hopper 3, a rotary kiln body 1, a heat exchange core 2, and a discharge bin 4;

[0031] The rotary kiln body 1 is inclined, and the heat exchange core 2 is inserted inside the rotary kiln body 1. The heat exchange core 2 is configured to rotate synchronously or differentially with the rotary kiln body 1 in the same direction of rotation.

[0032] A material channel 101 is formed between the rotary kiln body 1 and the heat exchange core 2, and a fluid channel 201 is formed inside the heat exchange core 2. The fluid channel 201 is used to introduce high-temperature fluid.

[0033] The feed hopper 3 is located at the kiln head of the rotary kiln body 1 and is configured to convey powdered raw materials into the material channel 101; the heat exchange core 2 is used to realize heat exchange between the high-temperature fluid in the fluid channel 201 and the powdered raw materials in the material channel 101 to dry the powdered raw materials; the discharge bin 4 is located at the kiln tail of the rotary kiln body 1 and is configured to collect the dried powdered raw materials output from the material channel 101.

[0034] Understandably, the rotation axis of the rotary kiln body 1 is inclined relative to the horizontal plane, and the rotary kiln body 1 can rotate around its rotation axis. The material channel 101 extends along the direction of the rotation axis. This design ensures that the powdered raw material can move from the kiln head to the kiln tail of the drying kiln along the material channel 101 under its own gravity.

[0035] The powdered raw material can be gypsum or lime. The feed hopper 3 is connected to the kiln head end of the material channel 101 corresponding to the drying kiln. The discharge bin 4 is connected to the kiln tail end of the material channel 101 corresponding to the drying kiln. The discharge bin 4 is also equipped with a discharge port.

[0036] The heat exchange core 2 is inserted into the rotary kiln body 1 along an inclined direction. The high-temperature fluid flowing into the fluid channel 201 of the heat exchange core 2 can be high-temperature flue gas or high-temperature heat transfer oil. The high-temperature flue gas can come from the calcining kiln, that is, the flue gas outlet of the calcining kiln is connected to the heat exchange core 2. The temperature of the high-temperature flue gas can be configured to be no less than 500℃; the high-temperature heat transfer oil can be heat transfer oil output from the heat exchange tube of the high-temperature equipment, and the temperature of the high-temperature heat transfer oil can be configured to be no less than 200℃.

[0037] Meanwhile, the heat exchange core 2 can be fixedly installed inside the rotary kiln body 1 so that the heat exchange core 2 and the rotary kiln body 1 rotate synchronously; alternatively, the heat exchange core 2 can be rotatably installed inside the rotary kiln body 1 under the drive of a drive device, so that the heat exchange core 2 rotates with the rotary kiln body 1 at a differential speed along the same direction of rotation. The rotational speed of the rotary kiln body 1 is greater than the rotational speed of the heat exchange core 2.

[0038] The drying kiln of this invention, by setting a heat exchange core 2 inside the rotary kiln body 1, forms a material channel 101 between the rotary kiln body 1 and the heat exchange core 2. This allows high-temperature fluid to flow along the fluid channel 201 within the heat exchange core 2, while powdered raw materials input from the feed hopper 3 flow along the material channel 101. The powdered raw materials and the high-temperature fluid are isolated from each other, and indirect heat exchange can be achieved based on the heat exchange core 2, thus realizing the drying process of the powdered raw materials. Figure 2 Solid arrows indicate the flow direction of powdered raw materials, while dashed arrows indicate the flow direction of high-temperature fluids.

[0039] As can be seen from the above, the powdered raw materials and the high-temperature fluid are isolated from each other during the drying operation. The drying kiln shown in this embodiment can dry the powdered raw materials by using the heat of the high-temperature fluid under normal pressure. The dried powdered raw materials can be directly collected in the discharge bin 4, which overcomes the problem of separating the dried powdered raw materials and the high-temperature fluid in existing drying kilns. It can also effectively prevent the dried material from overflowing at the kiln head and kiln tail during the operation of the drying kiln, thereby effectively preventing air pollution in the working environment of the drying kiln.

[0040] In some embodiments, such as Figure 2 As shown, the inner wall of the rotary kiln body 1 is provided with a scoop plate 111, which extends toward the peripheral wall of the heat exchange core 2. The scoop plate 111 is used to move the powdered raw material along the circumference of the heat exchange core 2 during the rotation of the rotary kiln body 1.

[0041] Understandably, the first side of the scoop plate 111 is connected to the inner wall of the rotary kiln body 1, the second side of the scoop plate 111 extends toward the peripheral wall of the heat exchange core 2, and there is a gap between the second side of the scoop plate 111 and the peripheral wall of the heat exchange core 2.

[0042] Because the rotary kiln body 1 is inclined, during the rotation of the rotary kiln body 1, the powdered raw material will move downward along the material channel 101 between the rotary kiln body 1 and the heat exchange core 2 under its own gravity. The powdered raw material also has a tendency to lag behind the rotation of the rotary kiln body 1 in the circumferential direction. Since the scoop plate 111 is set on the inner wall of the rotary kiln body 1, during the rotation of the scoop plate 111 with the rotary kiln body 1, the scoop plate 111 will push the powdered raw material to move in the circumferential direction of the heat exchange core 2, ensuring that the powdered raw material fully receives the heat from the heat exchange core 2, thereby improving the drying effect of the powdered raw material.

[0043] In some embodiments, such as Figure 2 As shown, the scoop plate 111 extends along the axial direction of the rotary kiln body 1. This design can improve the scoop plate 111's circumferential feeding effect on powdery raw materials.

[0044] For example, multiple scoop plates 111 are provided, and the multiple scoop plates 111 are arranged sequentially and spaced apart along the circumference on the inner wall of the rotary kiln body 1.

[0045] For example, the first side of the ladle plate 111 is connected to the inner wall of the rotary kiln body 1, and the second side of the ladle plate 111 extends toward the peripheral wall of the heat exchange core 2. Both the first and second sides of the ladle plate 111 extend along the axial direction of the rotary kiln body 1. The plane on which the ladle plate 111 is located coincides with or is angled to the plane formed by the first side of the ladle plate 111 and the rotation axis of the rotary kiln body 1.

[0046] In some embodiments, the scoop plate 111 extends along a spiral trajectory relative to the rotation axis of the rotary kiln body 1. This design ensures that the scoop plate 111 moves the powdered raw material along the circumferential direction of the heat exchange core 2, and also utilizes the spiral conveying characteristics of the scoop plate 111 to drive the powdered raw material along the material channel 101 toward the kiln tail of the drying kiln.

[0047] In some embodiments, such as Figure 2 , Figure 3 and Figure 4 As shown, the heat exchange core 2 includes a heat-conducting cylinder 21, which extends along the rotation axis of the rotary kiln body 1. The heat-conducting cylinder 21 has a star-shaped cross-section along a plane perpendicular to the rotation axis, and a fluid channel 201 is formed inside the heat-conducting cylinder 21.

[0048] Understandably, to ensure heat exchange efficiency, the heat-conducting cylinder 21 is made of metal, such as steel. Meanwhile, by designing the cross-sectional shape of the heat-conducting cylinder 21 as a star, multiple circumferentially arranged material grooves are formed on its peripheral wall. Each groove can support a portion of the powdered raw material, increasing the heat exchange area of ​​the heat-conducting cylinder 21 and improving the drying effect on the powdered raw material.

[0049] For example, the cross-sectional shape of the heat-conducting cylinder 21 can be a square star, a pentagonal star, or a hexagonal star. The cross-sectional shape of the fluid channel 201 is adapted to the external profile of the cross-section of the heat-conducting cylinder 21.

[0050] For example, the high-temperature fluid introduced into the fluid channel 201 in this embodiment can be high-temperature flue gas.

[0051] Furthermore, such as Figure 3 As shown, adapters 22 are formed at both ends of the heat-conducting cylinder 21. The adapters 22 are connected to the fluid channel 201 and are also configured to be rotatably connected to the fixed pipeline.

[0052] Understandably, both ends of the heat-conducting cylinder 21 are tapered and connected to the corresponding adapter 22. The adapter 22 can be a sealed connector. While the adapter 22 is rotatably connected to the fixed pipeline, it also achieves a sealed connection. This design ensures that there is no leakage of high-temperature fluid at the connection between the heat-conducting cylinder 21 and the fixed pipeline, and also meets the rotation requirements of the heat-conducting cylinder 21 relative to the fixed pipeline.

[0053] In some embodiments, such as Figure 5 As shown, the heat exchange core 2 also includes a central tube 23, which is inserted into the heat-conducting cylinder 21. A fluid channel 201 is formed between the inner wall of the heat-conducting cylinder 21 and the peripheral wall of the central tube 23.

[0054] It is understood that the high-temperature fluid introduced into the fluid channel 201 in this embodiment can be high-temperature heat transfer oil. Since the high-temperature heat transfer oil is only distributed in the fluid channel 201 between the heat transfer cylinder 21 and the central tube 23, this design can reduce the weight of the heat transfer core 2 as much as possible while ensuring the heat exchange effect of the heat exchange core 2, thereby reducing the workload of the drying kiln.

[0055] In some embodiments, such as Figure 2 As shown, the peripheral wall of the heat-conducting cylinder 21 is connected to the inner wall of the rotary kiln 1. For example, the peripheral wall of the heat-conducting cylinder 21 is connected to the inner wall of the rotary kiln 1 through multiple discretely distributed points. This design ensures the unobstructed flow of the material channel 101 between the rotary kiln 1 and the heat exchange core 2, and also enables the heat exchange core 2 to rotate synchronously with the rotary kiln 1 in the same direction of rotation.

[0056] In some embodiments, the heat-conducting cylinder 21 and the rotary kiln body 1 are separated from each other, and the heat-conducting cylinder 21 is rotatably disposed inside the rotary kiln body 1.

[0057] Understandably, both ends of the heat-conducting cylinder 21 extend out of the rotary kiln body 1 and are rotatably mounted on the rotary support. At least one end of the heat-conducting cylinder 21 is connected to the drive device, so that under the drive of the drive device, the heat-conducting cylinder 21 is rotatably mounted inside the rotary kiln body 1 and can realize that the heat exchange core 2 rotates at a different speed along the same direction of rotation as the rotary kiln body 1.

[0058] In some embodiments, such as Figure 1 and Figure 2 As shown, in order to facilitate the rotational movement of the rotary kiln body 1, the rotary kiln body 1 includes a cylindrical kiln body 11, a rotary support 12, and a rotary drive assembly 13.

[0059] The cylindrical kiln body 11 is inclined and rotatably mounted on the rotary support 12. The rotary drive assembly 13 is connected to the cylindrical kiln body 11 to drive the cylindrical kiln body 11 to rotate on the rotary support 12. The first end of the cylindrical kiln body 11 is configured to be rotatably connected to the kiln head support, and the second end of the cylindrical kiln body 11 is rotatably connected to the discharge bin 4. The heat exchange core 2 is inserted into the cylindrical kiln body 11, and both ends of the heat exchange core 2 extend out of the cylindrical kiln body 11.

[0060] Specifically, two rotary supports 12 are configured, spaced apart from each other. One rotary support 12 provides rotational support to the first end of the cylindrical kiln body 11 at a first height, while the other rotary support 12 provides rotational support to the second end of the cylindrical kiln body 11 at a second height. This design ensures that the cylindrical kiln body 11 is rotatably mounted on the rotary supports 12 in an inclined configuration. Each rotary support 12 provides rotational support to the cylindrical kiln body 11 via two side-by-side support rollers.

[0061] At the same time, such as Figure 2 As shown, the rotary drive assembly 13 includes a drive motor 131, a gear assembly 132, and a gear ring 133; the drive motor 131 is connected to the gear ring 133 via the gear assembly 132, and the gear ring 133 is fitted onto the circumferential wall of the cylindrical kiln body 11.

[0062] Specifically, the drive motor 131 can be a geared motor, and the gear assembly 132 includes a first gear and a second gear. The output end of the drive motor 131 is connected to the first gear, and the first gear and the second gear are meshed together. The second gear is meshed with the gear ring 133. The gear ratio between the first gear and the second gear can be set according to actual needs.

[0063] Thus, when the drive motor 131 starts working, the drive motor 131 drives the first gear to rotate, the first gear drives the second gear to rotate, the second gear drives the gear ring 133 to rotate, and the gear ring 133 drives the cylindrical kiln body 11 to rotate on the rotary support 12.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A drying kiln, characterized in that, include: Feed hopper, rotary kiln body, heat exchange core and discharge bin; The rotary kiln body is inclined, and the heat exchange core is inserted into the rotary kiln body. The heat exchange core is configured to rotate synchronously or differentially with the rotary kiln body in the same direction of rotation. A material channel is formed between the rotary kiln body and the heat exchange core, and a fluid channel is formed inside the heat exchange core for introducing high-temperature fluid. The feed hopper is located at the kiln head of the rotary kiln and is configured to convey powdered raw materials into the material channel; the heat exchange core is used to realize heat exchange between the high-temperature fluid in the fluid channel and the powdered raw materials in the material channel, so as to dry the powdered raw materials; the discharge bin is located at the kiln tail of the rotary kiln and is configured to collect the dried powdered raw materials output from the material channel.

2. The drying kiln according to claim 1, characterized in that, The inner wall of the rotary kiln is provided with a scoop plate, which extends toward the peripheral wall of the heat exchange core. The scoop plate is used to move the powdered raw material along the circumference of the heat exchange core during the rotation of the rotary kiln.

3. The drying kiln according to claim 2, characterized in that, The scoop plate extends along the axial direction of the rotary kiln body, or the scoop plate extends along a spiral trajectory relative to the rotation axis of the rotary kiln body.

4. The drying kiln according to claim 1, characterized in that, The heat exchange core includes a heat-conducting cylinder that extends along the rotation axis of the rotary kiln. The heat-conducting cylinder has a star-shaped cross-section along a plane perpendicular to the rotation axis, and the fluid channel is formed inside the heat-conducting cylinder.

5. The drying kiln according to claim 4, characterized in that, The heat-conducting cylinder has adapters at both ends, which are connected to the fluid channel and are also configured to be rotatably connected to a fixed pipeline.

6. The drying kiln according to claim 4, characterized in that, The heat exchange core also includes a central tube, which is inserted into the heat-conducting cylinder. The fluid channel is formed between the inner wall of the heat-conducting cylinder and the peripheral wall of the central tube.

7. The drying kiln according to claim 4, characterized in that, The peripheral wall of the heat-conducting cylinder is connected to the inner wall of the rotary kiln.

8. The drying kiln according to claim 4, characterized in that, The heat-conducting cylinder and the rotary kiln body are separate from each other, and the heat-conducting cylinder is rotatably disposed within the rotary kiln body.

9. The drying kiln according to any one of claims 1 to 8, characterized in that, The rotary kiln body includes a cylindrical kiln body, a rotary support, and a rotary drive assembly; The cylindrical kiln body is inclined and rotatably mounted on the rotary support. The rotary drive assembly is connected to the cylindrical kiln body to drive the cylindrical kiln body to rotate on the rotary support. The first end of the cylindrical kiln body is configured to be rotatably connected to the kiln head support, and the second end of the cylindrical kiln body is rotatably connected to the discharge hopper; the heat exchange core is inserted into the cylindrical kiln body, and both ends of the heat exchange core extend out of the cylindrical kiln body.

10. The drying kiln according to claim 9, characterized in that, The rotary drive assembly includes a drive motor, a gear assembly, and a gear ring; the drive motor is connected to the gear ring via the gear assembly, and the gear ring is fitted onto the circumferential wall of the cylindrical kiln body.

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