Rotary kiln opening enclosure structure and rotary kiln

Abstract

The utility model relates to the technical field of rotary kilns, in particular to a rotary kiln mouth enclosure structure and a rotary kiln. The rotary kiln mouth enclosure structure comprises a kiln mouth supporting piece, a fire-resistant protection structure, a kiln mouth anchoring structure, a pouring material body and a flexible pad. The fireproof protection structure comprises a plurality of fireproof brick units which are adjacently arranged in the first direction. The kilneye anchoring structure comprises a plurality of anchoring parts, and the anchoring parts are arranged on the kilneye supporting part. The pouring material body is filled between the kilneye supporting piece and the refractory protection structure, and an expansion gap is formed between the pouring material body and the refractory brick unit on the outermost side; and the flexible pad is arranged in the expansion gap. According to the rotary kiln opening enclosure structure and the rotary kiln, the scheme that a traditional rotary kiln uses a brick retaining ring to rigidly limit the refractory bricks is omitted, the refractory protection structure is flexibly connected with the pouring material body through the flexible pad, and damage to the refractory bricks due to mechanical stress and thermal stress can be reduced; therefore, the service lives of the fireproof protection structure and the pouring material body are prolonged, and the effect of reducing energy consumption is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to rotary kiln technical field especially relates to a rotary kiln mouth surrounding fender structure and rotary kiln. BACKGROUND

[0002] In recent years, with the promotion of double carbon economy background, the cement industry is facing higher requirements, such as the large-scale of rotary kiln, the application of co-processing solid waste technology, and the normalization of industry peak-shaving production. Under these changes, the thermal load of rotary kiln increases, and the frequent operation of kiln start-stop makes the working conditions in the kiln change significantly, especially the working environment of refractory materials in the kiln mouth area becomes more demanding. The kiln mouth not only suffers the erosion of high-temperature clinker, but also bears greater mechanical stress due to the speed-up of rotary kiln, which accelerates the damage of refractory materials and seriously affects the output improvement of cement kiln.

[0003] In the prior art, a fender brick ring is usually arranged at the kiln mouth area of the rotary kiln, and the first ring of refractory bricks is tightly built against the fender brick ring, and then castable is constructed, so as to prevent the refractory bricks from sliding down or extruding the castable at the kiln mouth during operation. However, in actual operation, the fender brick ring is often affected by large thermal stress and mechanical stress, resulting in damage of the first ring of refractory bricks and castable in contact with it. With the passage of time, the refractory bricks close to the fender brick ring may be twisted and broken, and other refractory bricks around them may also be loose and extrude the castable. Finally, the entire ring of refractory bricks and the castable at the kiln mouth may fall off, causing the surface temperature of the cylinder to rise, thereby affecting the safety of the cylinder. SUMMARY

[0004] The utility model provides a kind of rotary kiln kiln mouth surrounding fender structure and rotary kiln to solve the problems of refractory material easy to damage, anchor fastener fixed effect unstable in the connection of fender brick ring and rotary kiln cylinder in prior art, which leads to the refractory material at kiln mouth falls off, affects the safety and production efficiency of rotary kiln.

[0005] The utility model provides a kind of rotary kiln kiln mouth surrounding fender structure on one hand, comprising: kiln mouth support, refractory protection structure, kiln mouth anchoring structure, castable and flexible pad.

[0006] The refractory protection structure includes a plurality of refractory brick units arranged adjacent in a first direction, each refractory brick unit includes a plurality of refractory bricks arranged adjacent in a second direction; the kiln mouth anchoring structure includes a plurality of anchor fasteners, the anchor fasteners are provided on the kiln mouth support; the castable is filled between the kiln mouth support and the refractory protection structure, the kiln mouth anchoring structure is anchored in the castable, and an expansion joint is provided between the castable and the outermost refractory brick unit; the flexible pad is provided in the expansion joint.

[0007] According to the rotary kiln inlet enclosure structure provided by this utility model, the width of the expansion joint is 3mm to 7mm.

[0008] According to the rotary kiln inlet enclosure structure provided by this utility model, the thickness of the flexible pad is 3mm to 7mm.

[0009] According to the rotary kiln inlet enclosure structure provided by this utility model, the flexible pad is a ceramic fiber felt / board / blanket, rock wool felt / board / blanket, zirconium-containing aluminum silicate fiber felt / board / blanket, or alumina crystal fiber blanket / felt / board.

[0010] The rotary kiln inlet enclosure structure provided by this utility model also includes a temporary retaining brick structure. When the refractory protection structure is being built, the temporary retaining brick structure is placed on the kiln inlet support, and one side of the temporary retaining brick structure abuts against the outermost refractory brick unit.

[0011] According to the rotary kiln inlet enclosure structure provided by this utility model, the temporary retaining brick structure is an angle steel or an I-beam.

[0012] According to the rotary kiln inlet enclosure structure provided by this utility model, the temporary retaining brick structure is welded to the kiln inlet support.

[0013] According to the rotary kiln inlet enclosure structure provided by this utility model, at least part of the anchors are connected to the outermost refractory brick unit.

[0014] According to the rotary kiln inlet enclosure structure provided by this utility model, the anchor includes a connecting part and at least one anchoring arm, the anchoring arm is connected to the connecting part, and the connecting part is welded to the kiln inlet support.

[0015] In another aspect, this utility model provides a rotary kiln, comprising: a cylindrical body and a rotary kiln inlet enclosure structure as described in any of the preceding claims, wherein the inlet support is connected to the cylindrical body.

[0016] The rotary kiln inlet enclosure structure and rotary kiln provided by this utility model eliminate the traditional method of using retaining brick rings to rigidly limit the refractory bricks. The refractory protection structure is flexibly connected to the cast refractory material through flexible pads, which can reduce mechanical and thermal stress damage to the refractory bricks, thereby extending the service life of the refractory protection structure and the cast refractory material, and thus achieving the effect of reducing energy consumption. At the same time, the rotary kiln inlet enclosure structure provided by this utility model is simple in process and convenient in construction.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] 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.

[0019] Figure 1 This is one of the schematic diagrams of the rotary kiln inlet enclosure structure provided in this embodiment of the utility model.

[0020] Figure 2 This is the second schematic diagram of the rotary kiln inlet enclosure structure provided in this embodiment of the utility model.

[0021] Figure 3 This is a schematic diagram of the refractory protection structure being built into the rotary kiln inlet enclosure structure provided in this embodiment of the utility model.

[0022] Figure label:

[0023] 100. Kiln mouth support; 200. Refractory protection structure; 210. Refractory brick unit; 211. Refractory brick; 300. Kiln mouth anchoring structure; 310. Anchor; 400. Castable material; 500. Flexible pad; 600. Temporary retaining brick structure. Detailed Implementation

[0024] 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 protection scope of this utility model.

[0025] In the description of the embodiments of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model 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 the embodiments of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model according to the specific circumstances.

[0027] In this embodiment of the utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0028] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0029] The following is combined Figures 1 to 3 This invention describes the rotary kiln inlet enclosure structure and the rotary kiln provided by this utility model.

[0030] See Figure 1 and Figure 2 As shown in the figure, the rotary kiln inlet enclosure structure provided in this embodiment of the present invention includes: kiln inlet support 100, fire-resistant protection structure 200, kiln inlet anchoring structure 300, castable material 400, and flexible pad 500.

[0031] The refractory protection structure 200 includes multiple refractory brick units 210 arranged adjacent to each other along a first direction, and each refractory brick unit 210 includes multiple refractory bricks 211 arranged adjacent to each other along a second direction; the kiln mouth anchoring structure 300 includes multiple anchors 310, which are located on the kiln mouth support 100; the castable material 400 is filled between the kiln mouth support 100 and the refractory protection structure 200, and the kiln mouth anchoring structure 300 is anchored within the castable material 400; an expansion joint is provided between the castable material 400 and the outermost refractory brick unit 210; and a flexible pad 500 is located within the expansion joint.

[0032] It should be noted that the aforementioned "first direction" specifically refers to Figure 1 The arrow direction shown above, specifically the "second direction" refers to... Figure 2 The arrow direction is shown.

[0033] The rotary kiln inlet enclosure structure provided by this utility model eliminates the traditional method of using retaining brick rings to rigidly limit the refractory bricks 211 in rotary kilns. The refractory protection structure 200 is flexibly connected to the castable material 400 through a flexible pad 500, which can reduce mechanical and thermal stress damage to the refractory bricks 211, thereby extending the service life of the refractory protection structure 200 and the castable material 400, thus achieving the effect of reducing energy consumption. At the same time, the rotary kiln inlet enclosure structure provided by this utility model has a simple process and is easy to construct.

[0034] Specifically, when the refractory bricks 211 in the refractory protection structure 200 are subjected to large thermal and mechanical stresses, the flexible pad 500 located between the refractory protection structure 200 and the castable 400 can play a buffering role, absorbing and dispersing these stresses, thereby reducing the pressure and deformation on the refractory bricks 211 and the castable 400.

[0035] To adapt to high-temperature working environments, the flexible mat 500 is preferably made of high-temperature refractory materials, such as ceramic fiber felt, rock wool felt, glass fiber felt, silicone fiber felt or aluminum silicate fiber felt, etc., all of which have excellent high-temperature resistance. In addition, the flexible mat 500 can be configured as flexible felt, flexible board or flexible blanket according to actual needs.

[0036] See Figure 1 and Figure 2 As shown, according to some embodiments of the present invention, the width of the expansion joint is 3mm to 7mm.

[0037] By setting the width of the expansion joint to 3mm to 7mm, it is possible to effectively cope with the expansion and contraction caused by temperature changes, reduce structural stress, maintain structural stability, and ensure the stability of the rotary kiln inlet enclosure structure in environments with large temperature differences.

[0038] Specifically, the width of the expansion joint can be 3mm, 4mm, 5mm, 6mm, or 7mm, etc. Preferably, the width of the expansion joint in this embodiment is 5mm.

[0039] See Figure 1 and Figure 2 As shown, according to some embodiments of the present invention, the thickness of the flexible pad 500 is 3mm to 7mm.

[0040] By setting the thickness of the flexible pad 500 to 3mm to 7mm, the stress between the fire-resistant protective structure 200 and the castable material 400 can be effectively absorbed and buffered, reducing stress concentration caused by temperature changes, vibration or mechanical pressure, thereby avoiding structural damage or cracks.

[0041] Specifically, the thickness of the flexible pad 500 can be 3mm, 4mm, 5mm, 6mm, or 7mm, etc. Preferably, the thickness of the flexible pad 500 in this embodiment is 5mm.

[0042] See Figure 3 As shown, according to some embodiments of the present invention, the rotary kiln inlet enclosure structure also includes a temporary brick retaining structure 600. When the refractory protection structure 200 is stacked, the temporary brick retaining structure 600 is provided on the kiln inlet support 100, and one side of the temporary brick retaining structure 600 abuts against the outermost refractory brick unit 210.

[0043] By setting up a temporary brick retaining structure 600, the refractory protection structure 200 can be limited during its construction, ensuring that the refractory brick units 210 maintain the correct position and stability during the stacking process. This allows for precise control of the stacking process and prevents structural displacement or instability caused by errors or uneven stacking. Furthermore, the temporary brick retaining structure 600 effectively supports and fixes the refractory brick units 210, preventing displacement or loosening during construction, thereby improving construction efficiency and ensuring the safety and durability of the kiln enclosure structure.

[0044] It should be noted that once the fire-resistant protective structure 200 is completed, the temporary retaining brick structure 600 can be removed. After removal, the fire-resistant protective structure 200 will be completely self-stabilized and able to withstand the stress and heat load during normal operation. Furthermore, the removal of the temporary retaining brick structure 600 will not affect the overall stability of the fire-resistant protective structure 200.

[0045] See Figure 3 As shown, according to some embodiments of this utility model, the temporary retaining brick structure 600 is an angle steel or an I-beam.

[0046] By setting the temporary brick retaining structure 600 as angle steel or I-beam, stronger support and structural stability can be provided, thus effectively limiting its position during the stacking of the fire-resistant protective structure 200.

[0047] Specifically, angle steel or I-beams possess high strength and rigidity, effectively resisting the mechanical pressure and stress generated during the stacking of the fire-resistant protective structure 200. This ensures that the firebrick units 210 remain in a fixed position during stacking, preventing displacement or deformation. Furthermore, the structural form of angle steel or I-beams makes the temporary retaining brick structure 600 more robust and durable, capable of withstanding greater external forces and extending its service life. During dismantling, these steel structures are easy to operate and disassemble, minimizing disruption to subsequent work and improving construction efficiency.

[0048] See Figure 3 As shown, according to some embodiments of the present invention, the temporary brick retaining structure 600 is welded to the kiln mouth support 100.

[0049] By configuring the temporary brick retaining structure 600 and the kiln mouth support 100 to be welded together, the fixation and overall stability between the two can be enhanced.

[0050] Specifically, the welded connection provides a robust link, ensuring that the temporary retaining brick structure 600 does not loosen or shift during the stacking of the refractory protection structure 200. The welded connection forms a solid whole between the temporary retaining brick structure 600 and the kiln mouth support 100, better distributing and transferring external pressure and stress, thereby ensuring the precise positioning of the refractory brick unit 210. Furthermore, the welded connection simplifies the construction process, reduces the complexity that may arise when using temporary supports, and improves work efficiency.

[0051] See Figure 1 As shown, according to some embodiments of the present invention, at least a portion of the anchor 310 is connected to the outermost refractory brick unit 210.

[0052] By connecting at least some of the anchors 310 to the outermost refractory brick unit 210, the anchors 310 can provide additional fixation and support to the refractory protection structure 200, preventing the refractory protection structure 200 from shifting or falling off during subsequent use, thereby improving the overall stability and safety of the refractory protection structure 200. In addition, this connection method can also enhance the structure's resistance to thermal expansion, vibration and other external pressures, ensuring that the refractory brick unit 210 maintains stability and long-term performance in high-temperature environments.

[0053] See Figure 1 and Figure 2As shown, according to some embodiments of the present invention, the anchor 310 includes a connecting part and at least one anchoring arm, the anchoring arm being connected to the connecting part, and the connecting part being welded to the kiln mouth support 100.

[0054] By welding the connecting portion of the anchor 310 to the kiln mouth support 100, a stable connection is ensured between the anchor 310 and the kiln mouth support 100, effectively transferring the force of the anchor arm to the kiln mouth support 100. The connection between the anchor arm and the connecting portion further enhances the fixing force between the refractory brick unit 210 and the supporting structure, improving the stability of the refractory protective layer. Thus, the anchor 310 can provide continuous support when the refractory brick unit 210 is subjected to thermal expansion, external stress, or vibration, preventing displacement or detachment of the refractory brick unit 210 and ensuring the safety and durability of the overall structure.

[0055] The construction process of the rotary kiln inlet enclosure structure provided by this utility model is described below. (See attached diagram.) Figures 1 to 3 As shown.

[0056] Welding temporary retaining brick structure 600: Draw a circular line along a set path on the kiln mouth support 100, and weld the temporary retaining brick structure 600 along the circular line. The temporary retaining brick structure 600 is made of angle steel or I-beam.

[0057] Constructing the fire-resistant protective structure 200: Construct the first fire-resistant brick unit 210 (the first fire-resistant brick unit 210 is the fire-resistant brick unit 210 adjacent to the temporary retaining brick structure 600) on one side. After completion, construct the subsequent fire-resistant brick units 210 in sequence to form the fire-resistant protective structure 200. After the fire-resistant protective structure 200 is constructed, remove the temporary retaining brick structure 600.

[0058] Attaching flexible pad 500: Attach a flexible pad 500 of a set thickness to the outer wall of the first refractory brick unit 210 facing the kiln opening. The flexible pad 500 is preferably made of ceramic fiber felt, rock wool felt, glass fiber felt, silicone fiber felt or aluminum silicate fiber felt, etc., and the thickness is preferably 3mm to 7mm.

[0059] Welded kiln opening anchorage structure 300: Anchors 310 adopt a kiln opening-specific design model. Some anchors 310 are connected to the outermost refractory brick unit 210. This part of the anchors 310 needs to be welded more densely and the welding quality must be ensured.

[0060] Material casting: High-strength castable refractory specifically for kiln openings is used. During casting, construction is carried out in groups according to the protective iron. When setting up the formwork, a 5mm thick flexible pad is used with 500mm reserved expansion joints, and a 50mm diameter vibrator is used for compaction. After casting one set of molds, wait for the material to harden. Continue installing the next set of molds, casting, and vibrating until the entire cast material is completed.

[0061] As can be seen from the above description of the embodiments, the rotary kiln inlet enclosure structure provided by this utility model has at least the following advantages.

[0062] (1) The rotary kiln inlet enclosure structure provided by this utility model can reduce mechanical stress and thermal stress damage to refractory bricks 211, thereby extending the service life of refractory protection structure 200 and castable material 400, thus achieving the effect of reducing energy consumption.

[0063] (2) The rotary kiln inlet enclosure structure provided by this utility model, by setting a temporary brick retaining structure 600, can flexibly adjust the starting position of the first refractory brick unit 210 when the refractory brick 211 is difficult to lay due to the deformation of the kiln inlet cylinder, without increasing the replacement of the brick retaining ring, reducing construction time and saving maintenance costs.

[0064] (3) The rotary kiln inlet enclosure structure provided by this utility model adopts segmented casting of the kiln inlet castable, which can reduce the amount of water added to the castable, which is conducive to full vibration and improves the density and erosion resistance of the castable.

[0065] The rotary kiln provided in this embodiment includes: a cylinder and a rotary kiln inlet enclosure structure as described in any of the above embodiments, wherein the kiln inlet support 100 is connected to the cylinder.

[0066] The rotary kiln provided by this utility model, by adopting the rotary kiln inlet enclosure structure as described in any of the above embodiments, can reduce mechanical stress and thermal stress damage to the refractory bricks 211, thereby extending the service life of the refractory protection structure 200 and the castable material 400, and thus achieving the effect of reducing energy consumption.

[0067] 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 rotary kiln inlet enclosure structure, characterized in that, include: Kiln opening support components; A fire-resistant protective structure, the fire-resistant protective structure comprising a plurality of fire-resistant brick units arranged adjacent to each other along a first direction, each fire-resistant brick unit comprising a plurality of fire-resistant bricks arranged adjacent to each other along a second direction; A kiln opening anchoring structure, comprising multiple anchors, wherein the anchors are disposed on the kiln opening support member; A castable material is filled between the kiln opening support and the refractory protection structure. The kiln opening anchoring structure is anchored to the castable material. An expansion joint is provided between the castable material and the outermost refractory brick unit. A flexible pad is disposed within the expansion joint.

2. The rotary kiln inlet enclosure structure according to claim 1, characterized in that, The width of the expansion joint is 3mm to 7mm.

3. The rotary kiln inlet enclosure structure according to claim 2, characterized in that, The thickness of the flexible pad is 3mm to 7mm.

4. The rotary kiln inlet enclosure structure according to claim 1, characterized in that, The flexible pad is a ceramic fiber felt / board / blanket, rock wool felt / board / blanket, zirconium-containing aluminum silicate fiber felt / board / blanket, or alumina crystal fiber blanket / felt / board.

5. The rotary kiln inlet enclosure structure according to claim 1, characterized in that, It also includes a temporary brick retaining structure, which is installed on the kiln opening support when the refractory protection structure is being built, and one side of the temporary brick retaining structure abuts against the outermost refractory brick unit.

6. The rotary kiln inlet enclosure structure according to claim 5, characterized in that, The temporary retaining brick structure is made of angle steel or I-beams.

7. The rotary kiln inlet enclosure structure according to claim 5, characterized in that, The temporary retaining brick structure is welded to the kiln opening support.

8. The rotary kiln inlet enclosure structure according to claim 1, characterized in that, At least a portion of the anchor is connected to the outermost refractory brick unit.

9. The rotary kiln inlet enclosure structure according to claim 1, characterized in that, The anchor includes a connecting part and at least one anchoring arm, the anchoring arm being connected to the connecting part, and the connecting part being welded to the kiln mouth support.

10. A rotary kiln, characterized in that, include: cylindrical body; The rotary kiln inlet enclosure structure as described in any one of claims 1 to 9, wherein the kiln inlet support is connected to the cylinder.

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