Online anti-scaling device for rotary furnace and rotary furnace

Abstract

The invention relates to the technical field of chemical equipment, and provides an online anti-scaling device for a rotary furnace and the rotary furnace, the online anti-scaling device comprises a furnace body, a scale removing shovel plate, a shovel plate tripping assembly and a spiral, the spiral is arranged in the furnace body and is a spiral piece extending in the annular direction, a sliding groove is formed in the spiral piece, and the shovel plate tripping assembly is arranged in the sliding groove. The spiral piece comprises a plurality of spiral blades which are arranged in sequence, the scale removing shovel plate is arranged between every two adjacent spiral blades in a sliding mode, and each spiral blade is evenly provided with the shovel plate tripping assemblies; the scale removing shovel plate has a tripping state, and in the tripping state, the shovel plate tripping assembly loses efficacy in supporting the scale removing shovel plate so that the scale removing shovel plate can remove scale on the inner wall of the furnace body. The inner wall of the rotary furnace can be effectively prevented from scaling, the heat transfer efficiency of the rotary furnace is guaranteed, the labor cost is reduced, and the production efficiency is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of chemical equipment, and in particular to an online anti-scaling device for a rotary furnace and a rotary furnace, and in particular to a device for preventing scaling of a pyrolysis rotary furnace in a fly ash resource utilization process. Background Art

[0002] In the fly ash resource utilization process, horizontal rotary kilns are widely used in the pyrolysis reaction of fly ash materials to achieve the purpose of removing dioxins from fly ash (heating to a certain temperature and rapid cooling in an anaerobic environment to remove dioxins). The rotary kiln is often installed at an angle, and the inner wall of the furnace is provided with intermittent or continuous spiral blades. The fly ash materials are heated during the movement, and the heating temperature needs to reach a certain value. However, due to the low melting point of some materials, they will melt in the furnace during the heating process, and then form scales in the cooling section and adhere to the inner wall of the rotary kiln, forming thick scales, which will greatly reduce the heat transfer efficiency of the furnace, affect the reaction effect, and further affect the dioxin removal effect.

[0003] After the rotary kiln has been running for a period of time, it needs to be shut down and manually cleaned of the scale, which is not conducive to continuous production, increases labor costs, and greatly reduces production efficiency. At present, there is no mature technology or device that can be used to prevent the scaling of the rotary kiln wall with spiral blades on the inner wall online. Therefore, it is urgent to design an anti-scaling device to solve the above problem. Summary of the invention

[0004] In view of the defects in the prior art, an object of the present invention is to provide an online anti-scaling device for a rotary kiln and a rotary kiln.

[0005] According to the present invention, an online anti-scaling device for a rotary furnace comprises a driving mechanism, a furnace body, a descaling shovel plate, a shovel plate release assembly and a spiral;

[0006] The driving mechanism can drive the furnace body to rotate, the spiral is arranged inside the furnace body and can rotate simultaneously with the furnace body, the spiral is a spiral sheet extending in a circular direction, the spiral sheet has a slide groove along the direction of spiral extension, the spiral sheet includes a plurality of spiral blades arranged in sequence, the descaling shovel plate can be slidably arranged between two adjacent spiral blades, and each of the spiral blades is evenly provided with a plurality of the shovel plate release assemblies;

[0007] The cleaning shovel plate has an initial state and a disengaged state. When the cleaning shovel plate is in the initial state, the cleaning shovel plate is located at the bottom of the furnace body. At this time, the furnace body can drive the spiral to rotate and drive the cleaning shovel plate under the drive of the shovel plate disengaging assembly and make the cleaning shovel plate in the disengaged state. In the disengaged state, the support of the shovel plate disengaging assembly for the cleaning shovel plate fails, and the cleaning shovel plate begins to slide along the slide groove to the bottom of the furnace body and can then clean the inner wall of the furnace body.

[0008] Preferably, the cleaning shovel comprises a shovel body, the shovel body is used for the cleaning operation, and both ends of the shovel body are inclined surfaces.

[0009] Preferably, the cleaning shovel plate also includes a first guide rod and a second guide rod respectively arranged at both ends of the shovel plate body, both ends of the first guide rod and the second guide rod respectively extend into the slide groove, and the ends of the two guide rods guide the sliding of the shovel plate body under the constraint of the slide groove.

[0010] Preferably, the outer peripheral surface of the shovel plate body is an outer arc surface, and the diameter of the outer arc surface is the same as the diameter of the inner wall of the furnace body.

[0011] Preferably, when viewed from the inner side of the shovel plate body, the left side of the first guide rod is farther from the end than the right side, and the left side of the second guide rod is closer to the end than the right side.

[0012] Preferably, when the shovel plate body slides downward along the inner wall of the furnace body after falling, it is not only displaced along the circumferential direction of the inner wall of the furnace body, but also displaced along the axial direction of the furnace body.

[0013] Preferably, the shovel board release assembly comprises a spring fixing pin, a spring and a stopper;

[0014] The spring fixing pin and the shaft body are respectively arranged on the spiral side wall, and the stopper is rotatably arranged on the spiral side wall through the shaft body. One end of the stopper is elastically matched with the spring fixing pin through a spring, and the other end of the stopper extends to one side of the slide groove and contacts and abuts against the end of the first guide rod.

[0015] Preferably, the first guide rod and the second guide rod are respectively arranged at two ends of the shovel plate body through rib plates, and the rib plates and the guide rods are an integrally formed structure.

[0016] Preferably, the distance between two adjacent spiral blades is the pitch, and the width of the shovel plate body is smaller than the pitch.

[0017] A rotary kiln provided according to the present invention comprises the online anti-scaling device for a rotary kiln.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The online anti-scaling device of the present invention drives the cleaning shovel plate to rotate when the rotary kiln rotates, and when reaching the tripping state, it breaks free from the restraint of the shovel plate tripping assembly and slides along the inner wall of the furnace body under its own gravity to clean the scale. Under the condition of continuous production, it can effectively prevent scaling of the inner wall of the rotary kiln and ensure the heat transfer efficiency of the rotary kiln, which not only reduces labor costs but also greatly improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0021] Figure 1 It is a schematic diagram of the structural section of the furnace body cross section;

[0022] Figure 2 for Figure 1 A schematic diagram of the enlarged local structure of the A part;

[0023] Figure 3 This is a schematic diagram of the structure of a descaling shovel plate;

[0024] Figure 4 It is a schematic diagram of the spiral structure;

[0025] Figure 5 for Figure 4 A schematic diagram of the enlarged local structure of the A part;

[0026] Figure 6 for Figure 5 Schematic diagram of the enlarged local structure of area B in the middle.

[0027] The figure shows:

[0028] Furnace 1

[0029] Descaling shovel 2

[0030] First guide rod 21

[0031] The second guide rod 22

[0032] Shovel body 23

[0033] Rib 24

[0034] Spring fixing pin 3

[0035] Spring 4

[0036] Block 5

[0037] Axis 6

[0038] Helix 7

[0039] Chute 71 DETAILED DESCRIPTION

[0040] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0041] The present invention provides an online anti-scaling device for a rotary kiln, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, it includes a driving mechanism, a furnace body 1, a cleaning shovel plate 2, a shovel plate release assembly and a spiral 7. The driving mechanism can drive the furnace body 1 to rotate. The spiral 7 is arranged on the inner wall of the furnace body 1 and can rotate simultaneously with the furnace body 1. The spiral 7 is preferably arranged coaxially with the furnace body 1. The spiral 7 is preferably welded and fixed on the inner wall of the furnace body 1. The spiral 7 is a spiral sheet extending in a circular direction. The spiral sheet forms a plurality of spiral blades arranged in sequence due to the spiral extension. The spiral sheet is provided with a slide groove 71 along the direction of the spiral extension. The cleaning shovel plate 2 can be slidably arranged between two adjacent spiral blades. A plurality of shovel plate release assemblies are evenly arranged on each spiral blade.

[0042] The cleaning shovel plate 2 has an initial state and a disengaged state during operation. When the cleaning shovel plate 2 is in the initial state, the cleaning shovel plate 2 is located at the bottom of the furnace body 1; when the cleaning shovel plate 2 is in the disengaged state, the cleaning shovel plate 2 moves to the highest position. In the disengaged state, the support of the shovel plate disengaging assembly for the cleaning shovel plate 2 fails, and the cleaning shovel plate 2 begins to slide along the slide groove 71 toward the bottom of the furnace body 1, and cleans the inner wall of the furnace body 1 during the sliding process.

[0043] It should be noted that the furnace body 1 can drive the spiral 7 to rotate and drive the cleaning shovel plate 2 to rotate under the drive of the shovel plate release assembly, and when the cleaning shovel plate 2 reaches the highest position, it can break away from the support of the shovel plate release assembly under the drive of the gravity of the cleaning shovel plate 2, and slide along the slide groove 71 to the bottom of the furnace body 1 to remove the scale on the inner wall of the furnace body 1.

[0044] like Figure 3As shown, the cleaning scraper plate 2 includes a scraper plate body 23 and a first guide rod 21 and a second guide rod 22 respectively arranged at both ends of the scraper plate body 23. The first guide rod 21 and the second guide rod 22 are respectively arranged at both ends of the scraper plate body 23 through rib plates 24. Preferably, the first guide rod 21 and the second guide rod 22 are both welded to the scraper plate body 23 through the rib plates 24. The rib plates 24 and the guide rods are an integrally formed structure. Both ends of the scraper plate body 23 are inclined surfaces. The length of the outer surface of the scraper plate body 23 is greater than the length of the inner surface. The inclined surface is designed to facilitate scraping of scale.

[0045] Furthermore, the outer peripheral surface of the shovel plate body 23 is an outer arc surface, and the diameter of the outer arc surface is the same as the diameter of the inner wall of the furnace body 1. Since the spiral blades extend in the spiral direction, the axis of each spiral blade is not parallel to the axis of the furnace body. Therefore, in order to make the outer arc surface contact the inner wall of the furnace body 1 more closely when the shovel plate body 23 slides on the inner wall of the furnace body 1, when observed from the inner side of the shovel plate body 23, the left side of the first guide rod 21 is farther from the nearest end than the right side, and the left side of the second guide rod 22 is closer to the nearest end than the right side, as shown in FIG. Figure 3 As shown, the left side of the first guide rod 21 and the second guide rod 22 is farther from the end than the right side. This structural design allows the outer arc surface to match and fit with the inner wall surface of the furnace body 1 when the shovel plate body 23 slides on the inner wall of the furnace body 1. When the shovel plate body 23 slides along the inner wall of the furnace body 1, the scale on the inner wall of the furnace body 1 can be cleaned more cleanly, and the scale cleaning effect is more ideal. It should be noted that when the shovel plate body 23 falls and slides downward along the inner wall of the furnace body 1, there is not only displacement along the circumferential direction of the inner wall of the furnace body 1, but also displacement along the axial direction of the furnace body 1.

[0046] like Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown, the cleaning of scale mainly relies on the shovel plate body 23. Both ends of the first guide rod 21 and both ends of the second guide rod 22 extend into the slide groove 71 respectively. Under the constraint of the slide groove 71, the ends of the guide rods enable the shovel plate body 23 to always fit the inner wall of the furnace body 1, which can effectively ensure the cleaning effect.

[0047] The distance between two adjacent spiral blades is the pitch, and the width of the shovel plate body 23 is slightly smaller than the pitch, so that when the shovel plate body 23 slides down, it will not be interfered by the spiral blades, and the shovel plate body 23 can slide smoothly between two adjacent spiral blades.

[0048] It should be noted that the shovel plate release assembly is preferably evenly distributed along the circumference of the spiral blade, and the number is determined according to the circumferential distance of each release sliding of the cleaning shovel plate 2, so that the circumferential sliding distance covers the entire inner wall of the furnace body. In order to reduce the interference of materials on the shovel plate release assembly, a protective cover can be installed on the outside of the shovel plate release assembly.

[0049] like Figure 4 , Figure 5 , Figure 6 As shown, the shovel plate release assembly includes a spring fixing pin 3, a spring 4, and a stopper 5. The spring fixing pin 3 and the shaft body 6 are respectively arranged on the side wall of the spiral 7. The stopper 5 is rotatably arranged on the side wall of the spiral 7 through the shaft body 6. One end of the stopper 5 is elastically matched with the spring fixing pin 3 through the spring 4, and the other end of the stopper 5 extends to one side of the slide groove 71 and contacts and abuts against the end of the first guide rod 21 or the second guide rod 22.

[0050] It should be noted that the spring fixing pin 3 and the shaft body 6 are welded to the side wall of the spiral 7 or are integrally formed with the side wall of the spiral 7, the stopper 5 is hinged to the side wall of the spiral 7 through the shaft body 6, and the two ends of the spring 4 are respectively fixed to the end of the stopper 5 and the spring fixing pin 3. The width of the cleaning shovel plate 2 is slightly smaller than the pitch of the spiral 7, and is installed in the spiral slide groove 71 through the first guide rod 21 and the second guide rod 22 provided at both ends, and can slide freely along the slide groove 71.

[0051] In practical applications, other methods may be used, such as adding additional guide grooves, so that the cleaning shovel plate 2 can slide along the spiral direction of the spiral 7. Since the outer arc surface diameter of the shovel plate body 23 is the same as the inner wall diameter of the furnace body 1, there is no gap between the shovel plate body 23 and the inner wall of the furnace body 1. When the spring 4 is in a free state, the length direction of the stopper 5 points to the radial direction of the furnace body.

[0052] The working principle of the present invention is as follows:

[0053] like Figure 1As shown, the cleaning shovel plate 2 is in an initial state, at which time the cleaning shovel plate 2 is at the lower part of the furnace body 1. When the furnace body 1 rotates counterclockwise, both ends of the first guide rod 21 of the cleaning shovel plate 2 are in contact with the stopper 5. Since the friction between the outer arc surface of the cleaning shovel plate 2 and the inner wall of the furnace body 1 and the pressure of the first guide rod 21 on the stopper 5 are less than the tension of the spring 4, the stopper 5 moves along the circumferential direction with the cleaning shovel plate 2. After rotating to a certain angle, when the gravity component of the cleaning shovel plate 2 is greater than the tension of the spring 4, at this time, the cleaning shovel plate 2 is In the disengaged state, the cleaning shovel plate 2 can drive the block 5 to rotate counterclockwise. When the block 5 rotates a certain angle so that the block 5 can no longer support the cleaning shovel plate 2, the cleaning shovel plate 2 will slide down quickly along the slide groove 71 on the spiral 7 due to its own gravity. Since the slide groove 71 on the spiral 7 matches the inner wall of the furnace body 1 in the circumferential direction, the cleaning shovel plate 2 will slide down closely against the inner wall of the furnace body 1 in the circumferential direction. During the sliding process, the inclined edge of the shovel plate body 23 will scoop up the dirt attached to the inner wall of the furnace body 1, effectively preventing the inner wall of the furnace body 1 from scaling. When the cleaning shovel plate 2 slides down to the lower part of the furnace body 1, it stops and will encounter the second set of shovel plate disengagement components distributed along the circumference of the furnace body. The block 5 on the second set of shovel plate disengagement components continues to rotate with the cleaning baffle plate 2, and the above process is repeated. It should be noted that when the furnace body 1 changes to clockwise rotation, the cleaning shovel plate 2 can overcome the pressure of the spring 4 and break free from the restraint of the block 5 and move in the opposite direction to return to its original position.

[0054] In practical applications, it is necessary to appropriately select the stiffness of the spring 4 and match the cleaning shovel plate 2 with an appropriate weight, so that the block 5 can drive the cleaning shovel plate 2 to rise to a certain height, and ensure that after the cleaning shovel plate 2 reaches a certain height, its own weight is greater than the pulling force of the spring 4, so that the support of the block 5 becomes invalid, thereby effectively adjusting the release time of the shovel plate release assembly, that is, the sliding height of the cleaning shovel plate 2, and then controlling the scraping force to ensure the cleaning effect.

[0055] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0056] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. An online anti-scaling device for a rotary kiln, characterized in that: It comprises a driving mechanism, a furnace body (1), a descaling shovel plate (2), a shovel plate release assembly and a screw (7); The driving mechanism is capable of driving the furnace body (1) to rotate, the spiral (7) is arranged inside the furnace body (1) and is capable of rotating simultaneously with the furnace body (1), the spiral (7) is a spiral blade extending in a circular direction, the spiral blade is provided with a slide groove (71) along the direction in which the spiral extends, the spiral blade comprises a plurality of spiral blades arranged in sequence, the descaling shovel plate (2) is slidably arranged between two adjacent spiral blades, and a plurality of the shovel plate release assemblies are evenly arranged on each of the spiral blades; The cleaning shovel plate (2) has an initial state and a disengaged state. When the cleaning shovel plate (2) is in the initial state, the cleaning shovel plate (2) is located at the bottom of the furnace body (1). At this time, the furnace body (1) can drive the spiral (7) to rotate and drive the cleaning shovel plate (2) under the drive of the shovel plate disengagement component and make the cleaning shovel plate (2) in the disengaged state. In the disengaged state, the support of the shovel plate disengagement component for the cleaning shovel plate (2) fails, and the cleaning shovel plate (2) starts to slide along the slide groove (71) to the bottom of the furnace body (1) and can then perform a cleaning operation on the inner wall of the furnace body (1).

2. The online anti-scaling device for a rotary kiln according to claim 1, characterized in that: The scale-cleaning shovel plate (2) comprises a shovel plate body (23), the shovel plate body (23) is used for the scale-cleaning operation, and both ends of the shovel plate body (23) are inclined surfaces.

3. The online anti-scaling device for a rotary kiln according to claim 2, characterized in that: The cleaning shovel plate (2) further comprises a first guide rod (21) and a second guide rod (22) respectively arranged at two ends of the shovel plate body (23); the two ends of the first guide rod (21) and the two ends of the second guide rod (22) respectively extend into the slide groove (71); the ends of the two guide rods both guide the sliding of the shovel plate body (23) under the constraint of the slide groove (71).

4. The online anti-scaling device for a rotary kiln according to claim 2, characterized in that: The outer peripheral surface of the shovel plate body (23) is an outer arc surface, and the diameter of the outer arc surface is the same as the diameter of the inner wall of the furnace body (1).

5. The online anti-scaling device for a rotary kiln according to claim 3, characterized in that: When viewed from the inner side of the shovel plate body (23), the left side of the first guide rod (21) is farther from the end than the right side, and the left side of the second guide rod (22) is closer to the end than the right side.

6. The online anti-scaling device for a rotary kiln according to claim 2, characterized in that: When the shovel plate body (23) slides downward along the inner wall of the furnace body (1) after falling, it is not only displaced in the circumferential direction of the inner wall of the furnace body (1), but also displaced in the axial direction of the furnace body (1).

7. The online anti-scaling device for a rotary kiln according to claim 3, characterized in that: The shovel plate release assembly comprises a spring fixing pin (3), a spring (4) and a stopper (5); The spring fixing pin (3) and the shaft (6) are respectively arranged on the side wall of the spiral (7); the stopper (5) is rotatably arranged on the side wall of the spiral (7) through the shaft (6); one end of the stopper (5) is elastically matched with the spring fixing pin (3) through the spring (4); the other end of the stopper (5) extends to one side of the slide groove (71) and contacts and abuts against the end of the first guide rod (21).

8. The online anti-scaling device for a rotary kiln according to claim 3, characterized in that: The first guide rod (21) and the second guide rod (22) are respectively arranged at two ends of the shovel plate body (23) through rib plates (24), and the rib plates (24) and the guide rods are an integrally formed structure.

9. The online anti-scaling device for a rotary kiln according to claim 2, characterized in that: The distance between two adjacent spiral blades is the pitch, and the width of the shovel plate body (23) is smaller than the pitch.

10. A rotary kiln, characterized in that: An online anti-scaling device for a rotary kiln comprising any one of claims 1 to 9.

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