Online anti-scaling device for rotary furnace and rotary furnace

Abstract

The utility model relates to the technical field of chemical equipment, and provides an on-line anti-scaling device for a rotary furnace and the rotary furnace, the on-line anti-scaling device for the rotary furnace comprises a furnace body, a scale cleaning shovel plate, a shovel plate tripping assembly and a spiral, the spiral is arranged in the furnace body, the spiral is a spiral piece extending along the annular direction, a sliding groove is formed in the spiral piece, and the shovel plate tripping assembly is arranged on the spiral piece. 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 self-adaptive cleaning action of the inner wall of the furnace body is achieved, cleaning is thorough, operation is easy, durability is achieved, and practicability is high.

Description

Technical Field

[0001] This utility model relates to the field of chemical equipment technology, specifically to an online anti-scaling device for rotary kilns and a rotary kiln, and more particularly to a device for preventing scaling in pyrolysis rotary kilns during fly ash resource utilization processes. Background Technology

[0002] In fly ash resource utilization processes, horizontal rotary kilns are widely used in the pyrolysis reaction of fly ash materials to remove dioxins (by heating to a certain temperature and rapidly cooling in an oxygen-free environment). Rotary kilns are often installed at an angle, with intermittent or continuous spiral blades on the inner wall. The fly ash material is heated during its movement, and the heating temperature needs to reach a certain value. However, because some materials have low melting points, they melt inside the furnace during heating, subsequently forming scale in the cooling section and adhering to the inner wall of the rotary kiln, forming a thick scale that significantly reduces the furnace's heat transfer efficiency, affects the reaction effect, and consequently impacts the dioxin removal efficiency.

[0003] Given that scale easily forms on the inner wall of a rotary kiln during operation, various design schemes exist in the prior art, but the cleaning effect is poor, and the scale remains on the inner wall of the kiln evenly. For example, patent document CN108267002B discloses an externally heated rotary kiln, including a drum. At least one cleaning chain is provided on the outer wall of the drum, which deforms naturally with the movement of the drum to contact and scrape the outer wall surface of the drum. In the externally heated rotary kiln, because the cleaning chain is a chain structure, it can deform naturally with the movement of the drum, thereby cleaning the scale on the inner wall of the rotary kiln. However, it still has the defect of not cleaning thoroughly, and a lot of scale remains on the inner wall of the kiln. The structural design is unreasonable. Utility Model Content

[0004] In view of the deficiencies in the prior art, the purpose of this utility model is to provide an online anti-scaling device for rotary kilns and a rotary kiln.

[0005] According to the present invention, an online anti-scaling device for a rotary kiln is provided, comprising a kiln body, a scale removal scraper, a scraper release assembly, and a spiral.

[0006] The spiral is welded inside the furnace body. The spiral is a spiral blade extending in a circumferential direction. The spiral blade has a sliding groove along the spiral extension direction. The spiral blade includes multiple spiral blades arranged in sequence. The scale removal scraper is slidably configured between two adjacent spiral blades. Multiple scraper release assemblies are spaced apart on each spiral blade.

[0007] The cleaning scraper has an initial state and a disengaged state. When the cleaning scraper is in the initial state, it 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 scraper to move synchronously under the drive of the scraper disengagement assembly until the cleaning scraper is in the disengaged state. In the disengaged state, the scraper disengagement assembly fails to support the cleaning scraper, and the cleaning scraper starts to slide along the slide groove towards the bottom of the furnace body by its own weight, thereby enabling the cleaning operation of the inner wall of the furnace body.

[0008] The cleaning scraper includes a scraper body, which is used for the cleaning operation. During the process of sliding the scraper body towards the bottom of the furnace, its outer surface matches and fits against the inner wall of the furnace.

[0009] Preferably, the cleaning scraper also includes a scraper body and a first guide rod and a second guide rod respectively disposed at both ends of the scraper body, wherein both ends of the scraper body are inclined surfaces.

[0010] Preferably, the outer circumferential 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.

[0011] Preferably, when viewed from the inner side of the shovel 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 falls and slides downward along the inner wall of the furnace, there is not only displacement along the circumferential direction of the inner wall of the furnace, but also displacement along the axial direction of the furnace body.

[0013] Preferably, the spiral blade has a groove along the spiral extension direction, and the two ends of the first guide rod and the two ends of the second guide rod extend into the groove respectively. The ends of the two guide rods are constrained by the groove so that the shovel body can always fit against the inner wall of the furnace.

[0014] Preferably, the shovel plate release assembly includes a spring retaining pin, a spring, and a stop block;

[0015] The spring fixing pin and the shaft are respectively disposed on the spiral sidewall. The stop block is rotatably disposed on the spiral sidewall via the shaft. One end of the stop block is elastically engaged with the spring fixing pin via a spring, and the other end of the stop block extends to one side of the slide groove and contacts and abuts against the end of the first guide rod.

[0016] Preferably, the first guide rod and the second guide rod are respectively disposed at both ends of the shovel plate body by means of ribs, and the ribs and guide rods are integrally formed.

[0017] Preferably, the distance between two adjacent spiral blades is the pitch, and the width of the shovel body is slightly smaller than the pitch.

[0018] A rotary kiln according to the present invention includes the aforementioned online anti-scaling device for the rotary kiln.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] This invention features a shovel body that fits and conforms to the inner wall of a rotary kiln. When the shovel is in the disengaged state, the shovel body can slide along the inner wall of the kiln to clean it. The shovel body remains in contact with the inner wall during this sliding process, eliminating the defects of incomplete cleaning and residual scale on the inner wall. This invention achieves self-adaptive cleaning of the inner wall, is simple to operate, durable, and highly practical. Attached Figure Description

[0021] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0022] Figure 1 A schematic diagram of the cross-sectional structure of the furnace body;

[0023] Figure 2 for Figure 1 Enlarged schematic diagram of the local structure of part A in the middle;

[0024] Figure 3 This is a schematic diagram of the structure of the cleaning scraper.

[0025] Figure 4 This is a schematic diagram of a spiral structure;

[0026] Figure 5 for Figure 4 Enlarged schematic diagram of the local structure of part A in the middle;

[0027] Figure 6 for Figure 5 A magnified schematic diagram of the local structure of part B in the middle section.

[0028] The diagram shows:

[0029] Furnace body 1

[0030] Scale removal scraper 2

[0031] First guide rod 21

[0032] Second guide rod 22

[0033] Shovel body 23

[0034] Rib 24

[0035] Spring retaining pin 3

[0036] Spring 4

[0037] Block 5

[0038] Shaft 6

[0039] Spiral 7

[0040] Slide 71 Detailed Implementation

[0041] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0042] This utility model provides an online anti-scaling device for rotary kilns, such as... Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, the furnace includes a furnace body 1, a descaling scraper 2, a scraper release assembly, and a spiral 7. The spiral 7 is disposed on the inner wall of the furnace body 1 and can rotate simultaneously with the furnace body 1. The spiral 7 is preferably coaxially arranged with the furnace body 1. The spiral 7 is preferably welded and fixed to the inner wall of the furnace body 1. The spiral 7 is a spiral blade extending in a circular direction. Due to the spiral extension, the spiral blade forms multiple spiral blades arranged in sequence. The spiral blade has a sliding groove 71 along the spiral extension direction. The descaling scraper 2 is slidably disposed between two adjacent spiral blades. Multiple scraper release assemblies are evenly arranged on each spiral blade.

[0043] The cleaning scraper plate 2 has an initial state and a disengaged state during operation. When the cleaning scraper plate 2 is in the initial state, it is located at the bottom of the furnace body 1. When the cleaning scraper plate 2 is in the disengaged state, it moves to the highest position. In the disengaged state, the scraper plate disengagement assembly fails to support the cleaning scraper plate 2, and the cleaning scraper plate 2 begins to slide along the slide groove 71 towards the bottom of the furnace body 1. During the sliding process, it performs cleaning operations on the inner wall of the furnace body 1.

[0044] It should be noted that the furnace body 1 can drive the spiral 7 to rotate and drive the cleaning scraper 2 to rotate under the drive of the scraper release assembly. When the cleaning scraper 2 reaches the highest position, it can be released from the support of the scraper release assembly under the drive of the scraper 2's gravity 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.

[0045] like Figure 3As shown, the scale removal scraper 2 includes a scraper body 23 and a first guide rod 21 and a second guide rod 22 respectively disposed at both ends of the scraper body 23. The first guide rod 21 and the second guide rod 22 are respectively disposed at both ends of the scraper body 23 by ribs 24. Preferably, the first guide rod 21 and the second guide rod 22 are both welded to the scraper body 23 by ribs 24. The ribs 24 and the guide rods are integrally formed. Both ends of the scraper body 23 are beveled. The length of the outer surface of the scraper body 23 is greater than the length of the inner surface. The beveled design facilitates scale removal.

[0046] Furthermore, the outer circumferential surface of the shovel body 23 is an outer arc surface, the diameter of which is the same as the diameter of the inner wall of the furnace body 1. Since the spiral blades extend along the spiral direction, the axis of each spiral blade is not parallel to the axis of the furnace body. Therefore, in order to ensure a tighter contact between the outer arc surface and the inner wall of the furnace body 1 when the shovel body 23 slides on the inner wall, when viewed from the inner side of the shovel body 23, the left side of the first guide rod 21 is farther from its nearest end than the right side, and the left side of the second guide rod 22 is closer to its nearest end than the right side. 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 of the scraper body 23 to match and fit against the inner wall surface of the furnace body 1 when it slides on the inner wall. When the scraper body 23 slides along the inner wall of the furnace body 1, it can clean the scale on the inner wall of the furnace body 1 more thoroughly, resulting in a more ideal scale removal effect. It should be noted that when the scraper 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.

[0047] like Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown, the cleaning of scale mainly relies on the scraper body 23. The two ends of the first guide rod 21 and the two ends of the second guide rod 22 extend into the slide groove 71 respectively. Under the constraint of the slide groove 71, the scraper body 23 can always fit against the inner wall of the furnace body 1, which can effectively ensure the scale removal effect.

[0048] The distance between two adjacent spiral blades is the pitch. The width of the shovel body 23 is slightly smaller than the pitch, so that the shovel body 23 is not interfered with by the spiral blades when it slides down, and the shovel body 23 can slide smoothly between two adjacent spiral blades.

[0049] It should be noted that the scraper release assembly is preferably evenly distributed along the circumference of the spiral blades, and the number is determined according to the circumferential distance of each release sliding of the scale removal scraper 2, ensuring that the circumferential sliding distance covers the entire inner wall of the furnace. To reduce material interference with the scraper release assembly, a protective cover can be installed on the outside of the scraper release assembly.

[0050] 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 stop block 5. The spring fixing pin 3 and the shaft 6 are respectively provided on the side wall of the spiral 7. The stop block 5 is rotatably mounted on the side wall of the spiral 7 through the shaft 6. One end of the stop block 5 is elastically engaged with the spring fixing pin 3 through the spring 4, and the other end of the stop block 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.

[0051] It should be noted that the spring fixing pin 3 and the shaft 6 are both welded to the side wall of the spiral 7 or integrally formed with the side wall of the spiral 7. The stop block 5 is hinged to the side wall of the spiral 7 through the shaft 6. The two ends of the spring 4 are respectively fixed to the end of the stop block 5 and the spring fixing pin 3. The width of the cleaning scraper 2 is slightly smaller than the pitch of the spiral 7, and it is installed in the spiral's groove 71 through the first guide rod 21 and the second guide rod 22 set at both ends, and can slide freely along the groove 71.

[0052] In practical applications, other methods can also be used, such as adding additional guide rail grooves, to allow the cleaning scraper 2 to slide along the spiral direction of the spiral 7. Since the outer arc diameter of the scraper body 23 is the same as the inner wall diameter of the furnace body 1, there is no gap between the scraper body 23 and the inner wall of the furnace body 1. When the spring 4 is in the free state, the length direction of the stop block 5 points to the radial direction of the furnace body.

[0053] The working principle of this utility model is as follows:

[0054] like Figure 1As shown, the cleaning scraper 2 is in its initial state, located 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 scraper 2 contact the stop block 5. Since the friction between the outer arc surface of the cleaning scraper 2 and the inner wall of the furnace body 1 and the pressure of the first guide rod 21 on the stop block 5 are less than the tension of the spring 4, the stop block 5 moves the cleaning scraper 2 circumferentially. After rotating to a certain angle, when the weight component of the cleaning scraper 2 is greater than the tension of the spring 4, the cleaning scraper 2... In the disengaged state, the cleaning scraper 2 drives the stop block 5 to rotate counterclockwise. When the stop block 5 rotates to a certain angle and can no longer support the cleaning scraper 2, the cleaning scraper 2, due to its own gravity, will quickly slide down along the groove 71 on the spiral 7. Since the groove 71 on the spiral 7 matches the inner wall of the furnace body 1 circumferentially, the cleaning scraper 2 will slide down circumferentially close to the inner wall of the furnace body 1. During the descent, the inclined edge of the scraper body 23 will scrape up the scale attached to the inner wall of the furnace body 1, effectively preventing scale buildup on the inner wall of the furnace body 1. When the cleaning scraper 2 slides down to the lower part of the furnace body 1, it stops and encounters the second set of scraper disengagement components distributed along the circumference of the furnace body. The stop block 5 on the second set of scraper disengagement components continues to rotate the cleaning scraper 2, repeating the above process. It should be noted that when the furnace body 1 rotates clockwise, the cleaning scraper 2 can also overcome the pressure of the spring 4 and break free from the restraint of the stop block 5 to move in the opposite direction and return to its original position.

[0055] In practical applications, it is necessary to appropriately select the stiffness of the spring 4 and match it with a cleaning scraper 2 of appropriate weight. This ensures that the stop block 5 can drive the cleaning scraper 2 to a certain height, while also ensuring that the weight of the cleaning scraper 2 exceeds the tension of the spring 4 after reaching a certain height, causing the stop block 5 to fail to support it. This allows for effective adjustment of the disengagement time of the scraper release assembly, i.e., the sliding height of the cleaning scraper 2, thereby controlling the scraping force and ensuring the cleaning effect.

[0056] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0057] The specific embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the substantive content of this utility model. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. An on-line anti-fouling device for a rotary kiln, characterized in that, The device comprises a furnace body (1), a scale removing shovel plate (2), a shovel plate tripping assembly and a spiral (7); The spiral (7) is welded inside the furnace body (1), the spiral (7) is a spiral sheet extending in the annular direction, the spiral sheet is provided with a sliding groove (71) in the direction of spiral extension, the spiral sheet comprises a plurality of spiral blades arranged in sequence, the scale removing shovel plate (2) is slidably arranged between two adjacent spiral blades, a plurality of shovel plate tripping assemblies are arranged on each spiral blade at intervals; The scale removing shovel plate (2) has an initial state and a tripped state, when the scale removing shovel plate (2) is in the initial state, the scale removing shovel plate (2) is located at the bottom of the inside of the furnace body (1), at this time, the furnace body (1) can drive the spiral (7) to rotate and drive the scale removing shovel plate (2) to move synchronously under the driving of the shovel plate tripping assembly until the scale removing shovel plate (2) is in the tripped state, in the tripped state, the support of the shovel plate tripping assembly to the scale removing shovel plate (2) is invalid, the scale removing shovel plate (2) starts to slide along the sliding groove (71) to the bottom of the furnace body (1) by relying on its own gravity and can perform scale removing work on the inner wall of the furnace body (1); The scale removing shovel plate (2) comprises a shovel plate body (23), the shovel plate body (23) is used for the scale removing work, the outer surface of the shovel plate body (23) matches and is attached to the inner wall of the furnace body (1) during the sliding process of the shovel plate body (23) to the bottom of the furnace body (1).

2. The on-line anti-fouling device for a rotary furnace according to claim 1, characterized in that, Both ends of the shovel plate body (23) are bevels.

3. The on-line anti-fouling device for a rotary furnace according to claim 2, characterized in that, The scale removing shovel plate (2) further comprises a first guide rod (21) and a second guide rod (22) arranged at both ends of the shovel plate body (23) respectively, both ends of the first guide rod (21) and both ends of the second guide rod (22) extend into the sliding groove (71) respectively, and the end portions of the two guide rods guide the sliding of the shovel plate body (23) under the constraint of the sliding groove (71).

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

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

6. The in-line anti-fouling device for a rotary kiln of claim 2, wherein, When the shovel plate body (23) falls and slides downward along the inner wall of the furnace body (1), it not only has displacement in the circumferential direction of the inner wall of the furnace body (1), but also has displacement in the axial direction of the furnace body (1).

7. The in-line anti-fouling device for a rotary kiln of claim 3, wherein, The shovel plate tripping assembly comprises a spring fixing pin (3), a spring (4) and a stop block (5); The spring fixing pin (3) and the shaft body (6) are arranged on the side wall of the spiral (7) respectively, the stop block (5) is rotatably arranged on the side wall of the spiral (7) through the shaft body (6), one end of the stop block (5) is elastically matched with the spring fixing pin (3) through the spring (4), and the other end of the stop block (5) extends to one side of the sliding groove (71) and abuts against the end portion of the first guide rod (21).

8. The in-line anti-fouling device for a rotary kiln of claim 3, wherein, The first guide rod (21) and the second guide rod (22) are arranged at two ends of the blade body (23) through the web plates (24) which are integrally formed with the guide rods.

9. The in-line anti-fouling device for a rotary kiln of claim 2, wherein, The distance between two adjacent spiral blades is a pitch, and the width of the blade body (23) is less than the pitch.

10. A rotary furnace, characterized by An online anti-fouling device for a rotary furnace according to any one of claims 1 to 9.

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