Heat insulation fireproof lining structure and cascade type rotary kiln
By using a bolted connection structure consisting of an insulation layer and refractory fiber modules in the rotary kiln, the problems of severe heat loss and short service life of the rotary kiln are solved, achieving the effects of lightweighting, energy saving and cost reduction.
Patent Information
- Application Number
- CN202520191349.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-07
- Publication Date
- 2026-02-17
- Estimated Expiration
- 2035-02-07
AI Technical Summary
The existing rotary kiln's internal lining structure is heavy and has a high thermal conductivity, resulting in severe heat loss, difficult maintenance, short service life, and high cost.
A heat-insulating and refractory fiber module is formed by fixing it with bolts, including materials such as nanoboards, ceramic fiber blankets or ceramic fiber boards, and is fixed between the outer wall of the kiln and the inner steel liner with bolts.
Reduce heat loss, lower weight, increase service life, reduce production costs, simplify construction process, and extend the service life of rotary kilns.
Smart Images
Figure CN223925378U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of heat -insulating refractory equipment, more specifically, a kind of heat -insulating refractory lining structure and cascade rotary kiln. BACKGROUND
[0002] Unlike traditional rotary kiln without inner container, cascade in cascade inner steel container rotary kiln refers to the scattered mode of material in inner steel container, heated material is placed in inner steel container, and the material in inner steel container is heated by flame burner on both sides, and the production is completed by rotating heating mode, and the finished product is discharged, and the periodic production mode of adding raw material again for processing.
[0003] In the existing rotary kiln, the structure of the kiln body lining part is generally castable structure or refractory brick structure, the self weight of this structure is large, the rotary kiln has high cost, is easy to damage and difficult to maintain during use, since the thermal conductivity of castable or refractory brick lining is large, heat dissipation is relatively fast, resulting in large heat loss of rotary kiln, and the process of production, transportation, construction and removal is very complicated, in actual operation, since the thermal conductivity of castable or refractory brick itself is large, and there are many heat dissipation bridges, heat loss is very serious, the heat preservation effect is poor, in addition, strict furnace heating system is also needed, which increases the construction period and use cost.
[0004] The lining structure of refractory brick is also not good in integrity, and is block-mounted for construction and use, which is easy to cause block-shaped refractory bricks to fall off during use, resulting in short service life under high temperature, thereby reducing the service life of the rotary kiln, and the removal operation of the old furnace is time-consuming and laborious, and the old lining cannot be recycled.
[0005] In summary, how to reduce the heat loss of rotary kiln, reduce the self weight, seek a light heat -insulating refractory lining, improve the service life of heat -insulating refractory lining and reduce production cost is a problem to be solved by the technical personnel in the field at present. UTILITY MODEL CONTENT
[0006] Therefore, the utility model aims at providing a heat -insulating refractory lining structure and cascade rotary kiln, which effectively reduces the heat loss of rotary kiln, reduces the self weight, improves the service life of heat -insulating refractory lining and reduces production cost.
[0007] In order to achieve the above purpose, the utility model provides the following technical scheme:
[0008] A kind of heat -insulating refractory lining structure, including heat preservation flat layer and refractory fiber module distributed successively from outermost cold face to hot face, the heat preservation flat layer and the refractory fiber module are fixed to the part to be connected simultaneously by bolt connecting piece.
[0009] Preferably, the heat preservation paving layer comprises at least one of nanometer plate, ceramic fiber blanket and ceramic fiber plate, and the thickness of the heat preservation paving layer is 10-50mm.
[0010] Preferably, the heat preservation paving layer comprises composite nanometer plate and ceramic fiber blanket or composite ceramic fiber blanket and ceramic fiber plate.
[0011] Preferably, the refractory fiber module is ceramic fiber module, aluminum silicate fiber module or alumina fiber module, and the thickness of the refractory fiber module is 150-300mm.
[0012] Preferably, the bolt connecting piece comprises a plurality of stainless steel bolts arranged at equal intervals in sequence.
[0013] Preferably, the arrangement interval of the stainless steel bolts is 200-350mm.
[0014] A cascade rotary kiln comprises a kiln body outer wall and an inner steel liner arranged in the kiln body outer wall, and a heat insulation refractory lining structure according to any one of the preceding embodiments is arranged between the kiln body outer wall and the inner steel liner.
[0015] Preferably, the part to be connected is the kiln body outer wall.
[0016] Preferably, a support is arranged between the kiln body outer wall and the inner steel liner, and the support comprises a plurality of block-shaped refractory pieces arranged uniformly between the kiln body outer wall and the inner steel liner, wherein the length of the block-shaped refractory piece is 300-500mm, the width of the block-shaped refractory piece is 300-500mm, and the thickness of the block-shaped refractory piece is 150-300mm.
[0017] Preferably, the arrangement interval of the block-shaped refractory pieces in the length direction of the rotary kiln is 1000-2000mm, and the block-shaped refractory pieces are arranged at equal intervals at an angle of 120° in the circumferential direction of the rotary kiln.
[0018] The heat insulation refractory lining structure comprises a heat preservation paving layer and a refractory fiber module arranged in sequence from the outermost cold surface to the hot surface, and the heat preservation paving layer and the refractory fiber module are fixed to the part to be connected by bolt connecting pieces.
[0019] The heat insulation refractory lining structure provided by the application fixes the heat preservation paving layer and the refractory fiber module to the part to be connected by bolt connecting pieces, so that the previous castable lining structure or refractory brick structure is changed, heat loss is reduced, and the heat preservation effect is improved.
[0020] The cascade rotary kiln provided by the utility model has a kiln body outer wall and an inner steel bladder arranged in the kiln body outer wall, and the kiln body outer wall and the inner steel bladder are provided with the heat insulation refractory lining structure. BRIEF DESCRIPTION OF DRAWINGS
[0021] In order to more clearly illustrate the technical solutions of the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only a part of the embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of the provided drawings.
[0022] Figure 1 It is a forward sectional view of the cascade rotary kiln in the embodiment;
[0023] Figure 2 It is a lateral sectional view of the cascade rotary kiln in the embodiment.
[0024] Figures 1-2 In the drawings, the reference signs include:
[0025] 1, heat preservation flat layer; 2, refractory fiber module; 3, support; 4, kiln body outer wall; 5, inner steel bladder. DETAILED DESCRIPTION
[0026] The technical solutions in the embodiments of the utility model will be clearly and completely described in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the utility model.
[0027] Unless otherwise defined, technical terms or scientific terms used in the present disclosure shall have the ordinary meaning as understood by a person of ordinary skill in the art to which the present disclosure belongs. The terms "first", "second", and similar terms used in the present disclosure do not denote any order, quantity, or importance, but are used to distinguish one element from another. The terms "connected" or "coupled" or similar terms do not limit to a physical or mechanical connection or coupling, but can include electrical connection or coupling, whether direct or indirect. The terms "upper", "lower", "left", "right", and the like are used only to indicate relative positions, and when the absolute positions of the described objects are changed, the relative positions can also be changed accordingly. The embodiments of the present disclosure disclose a heat-insulating refractory lining structure and a cascade rotary kiln.
[0028] The core of the present disclosure is to provide a heat-insulating refractory lining structure.
[0029] Another core of the present disclosure is to provide a cascade rotary kiln, which comprises the heat-insulating refractory lining structure described above.
[0030] Please refer to Figures 1-2 .
[0031] The heat-insulating refractory lining structure provided by the present disclosure comprises a heat-insulating paving layer 1 and a refractory fiber module 2 distributed in turn from the outermost cold surface to the hot surface, and the heat-insulating paving layer 1 and the refractory fiber module 2 are fixed to the connecting part by using a bolt connecting piece.
[0032] Specifically, the cold surface refers to the part in contact with the external environment and having a relatively low temperature. The cold surface mainly plays a role in protecting the kiln body, isolating the influence of the external environment on the temperature inside the kiln, and preventing heat loss. The hot surface refers to the part inside the rotary kiln directly in contact with high-temperature materials or flames, and the hot surface needs to withstand extremely high temperature and pressure. The heat-insulating paving layer 1 and the refractory fiber module 2 are fixed to the connecting part by using a bolt connecting piece, and the anchor is in point contact, which can reduce heat loss and improve heat-insulating effect, and also realizes the lightness and energy saving of the rotary kiln. At the same time, the construction is simple and convenient, which saves investment and use costs. Of course, in order to ensure the stability of the structure.
[0033] The heat-insulating refractory lining structure described above fixes the heat-insulating paving layer 1 and the refractory fiber module 2 to the connecting part by using a bolt connecting piece, which changes the previous castable lining structure or refractory brick structure, reduces heat loss, and improves heat-insulating effect. At the same time, the construction is simple and convenient, which saves investment and use costs.
[0034] The heat-insulating refractory lining structure provided by the present disclosure will be described in more detail below in combination with the drawings and specific embodiments.
[0035] In one specific embodiment, reference is made to Figure 1 andFigure 2 The thermal insulation layer 1 includes at least one of nanoboard, ceramic fiber blanket and ceramic fiber board, and the thickness of the thermal insulation layer 1 is 10mm-50mm.
[0036] Specifically, the thickness of the thermal insulation layer 1 is 10mm to 50mm, and the material of the thermal insulation layer 1 can preferably be nanoboard, ceramic fiber blanket or ceramic fiber board. The material selected for the thermal insulation layer 1 can be one or multiple materials combined.
[0037] It should be noted that this nanoboard is made of nano-aerogel powder, ceramic fiber materials, and water glass, which are then mixed, pressed, and molded. It has better thermal insulation performance and can more effectively prevent heat loss. Ceramic fiber blankets and ceramic fiber boards can also have the same heat insulation and high temperature resistance effects, which can save costs, reduce construction time, and improve the safety of rotary kiln use. It can also perform well under high temperature and high pressure conditions. This can be selected according to actual needs and is not limited here. Moreover, this thermal insulation layer can be made of various heat-resistant materials by compression.
[0038] Based on any of the above embodiments, refer to Figure 1 and Figure 2 The thermal insulation layer 1 includes a composite nanoplate and a ceramic fiber blanket or a composite ceramic fiber blanket and a ceramic fiber plate.
[0039] Specifically, when the insulation layer 1 uses a composite nanoboard and ceramic fiber blanket, this design combines the insulation performance of the nanoboard with the excellent flexibility and thermal insulation properties of the ceramic fiber blanket. The nanoboard, as the core insulation layer, effectively blocks heat transfer paths with its dense nano-aerogel structure, significantly reducing heat loss. The outer ceramic fiber blanket not only enhances the overall structural strength but also provides an additional thermal barrier, further improving the insulation effect. Furthermore, the ease of installation of the ceramic fiber blanket simplifies the construction process and improves work efficiency. If a composite ceramic fiber blanket and ceramic fiber board are chosen, the focus is on structural stability and durability under high-temperature conditions. The ceramic fiber blanket, as the base layer, provides uniform thermal insulation, while the ceramic fiber board, as the reinforcing layer, effectively prevents deformation or detachment of the insulation layer under high-temperature operation through its rigidity and high-temperature resistance, ensuring the safety and stability of the rotary kiln during long-term operation. This composite structure not only optimizes thermal insulation performance but also simplifies the positioning and fixing steps during installation by utilizing the limiting effect of ceramic fiber boards, thus reducing construction difficulty. Regardless of the composite method, the design of the insulation layer 1 fully considers the complementary advantages of materials and practical application needs, aiming to solve the thermal insulation problem of rotary kilns through an efficient and economical solution, while also taking into account ease of construction and long-term reliability. In practical applications, the most suitable combination of insulation materials can be flexibly selected based on factors such as the specific operating conditions of the rotary kiln, temperature requirements, and cost budget to achieve the best insulation effect and economic benefits.
[0040] Based on any of the above embodiments, refer to Figure 1 and Figure 2 The refractory fiber module 2 is a ceramic fiber module, an aluminum silicate fiber module, or an alumina fiber module, and the thickness of the refractory fiber module 2 is 150mm-300mm.
[0041] Specifically, the thickness of the refractory fiber module 2 is 150mm-300mm. The refractory fiber module 2 can preferably be a ceramic fiber module, an aluminum silicate fiber module, or an alumina fiber module. It can be prefabricated into a rectangular or square shape that is easy to splice. It has good heat insulation and fire resistance and can significantly reduce heat loss.
[0042] Furthermore, the refractory fiber modules 2 are preferably arranged in rows and can have a certain amount of compression, that is, a reserved amount for expansion, so that they can expand when the rotary kiln starts to heat up, achieving a better sealing effect and forming a solid intermediate insulation lining structure. This significantly reduces the temperature of the outer wall of the furnace, and the further insulation by the insulation layer greatly reduces the heat loss of the rotary kiln and improves the insulation effect.
[0043] Based on any of the above embodiments, refer to Figure 1 andFigure 2 The bolted connectors consist of multiple stainless steel bolts arranged at equal intervals in sequence.
[0044] Specifically, multiple stainless steel bolts are directly welded to the inner surface of the outer wall 4 of the kiln. Nuts can be placed inside the refractory fiber module 2 to fix the refractory fiber module to the outer wall 4 of the kiln, thereby fixing the insulation layer 1 to the outer wall 4 of the kiln. The anchors make point contact, which can reduce heat loss and improve the insulation effect. This also realizes the lightweight and energy-saving design of the rotary kiln, while simplifying and facilitating construction and saving investment and operating costs. This improves construction efficiency and provides better anchoring. Of course, other types of connectors can be selected according to actual needs; there are no restrictions here.
[0045] Furthermore, the spacing between the multiple stainless steel bolts is 200mm-350mm. This effectively increases the stability of the installation of the insulation layer 1 and the fire-resistant fiber module 2.
[0046] Please refer to Figures 1-2 .
[0047] The cascade rotary kiln provided by this utility model includes an outer wall 4 of the kiln and an inner steel liner 5 disposed within the outer wall 4. The aforementioned heat-insulating and refractory lining structure is provided between the outer wall 4 and the inner steel liner 5. The part to be connected is the outer wall 4 of the kiln.
[0048] Specifically, a cascade rotary kiln can be a horizontally cylindrical kiln; see further reference. Figure 1 The rotary kiln may include a feed inlet on one side, a discharge outlet on one side, an outer wall 4 of the kiln, and an inner steel liner 5. The outer wall 4 of the kiln may preferably be a steel plate and is fitted with a heat-insulating and refractory lining as described above on its inner surface. The inner steel liner 5 is fixed to the inner wall 4 of the kiln. The heat-insulating and refractory lining is located between the outer wall 4 of the kiln and the inner steel liner 5, and serves to provide heat insulation and refractory function.
[0049] The aforementioned cascade rotary kiln includes an outer kiln wall 4 and an inner steel liner 5, with an insulating refractory lining as described above in the intermediate layer. Because the outer kiln wall 4 is fitted with this insulating refractory lining, during heating of the inner steel liner 5, the space between the inner steel liner 5 and the outer kiln wall 4 forms a low-heat-loss insulating refractory layer structure. Therefore, it reduces heat loss in the rotary kiln, lowers costs, and extends its service life. It is evident that adopting this structure reduces heat dissipation, thus minimizing heat loss in the rotary kiln, lowering costs, and extending its service life.
[0050] The aforementioned rotary kiln eliminates the cumbersome kiln drying process, shortens the construction cycle, and seals the kiln body through the insulation layer 1, making the installation surface of the refractory fiber module 2 flat. At the same time, the refractory fiber module 2 has a certain degree of adjustability, which can well ensure the flatness of the heat insulation refractory lining. This results in a flat refractory lining with low heat dissipation, convenient installation, easy removal of old furnaces, good insulation effect, and construction is not limited by season. After the old furnace is removed, it is conducive to waste utilization.
[0051] Based on any of the above embodiments, refer to Figure 1 and Figure 2 A support member 3 is provided between the outer wall 4 of the kiln and the inner steel liner 5. The support member 3 includes multiple block refractory parts evenly arranged between the outer wall 4 of the kiln and the inner steel liner 5. The length of the block refractory parts is 300mm-500mm, the width of the block refractory parts is 300mm-500mm, and the thickness of the block refractory parts is 150mm-300mm.
[0052] Specifically, to ensure structural stability, the inner steel liner 5 of the rotary kiln is fixed with castable support members 3. Heated material is placed inside the inner steel liner 5, fed through the feeding port, and rotated to heat the liner 5. After completion, the material is discharged from the discharge port. This process is repeated, with material changes occurring over a period of 5 to 24 hours per kiln cycle, depending on the particle size of the processed product. The aforementioned castable support members 3 are made of refractory castable, with a service temperature reaching 1500℃ and better refractory performance. This increases the service temperature of the entire lining's refractory insulation and extends the service life of the rotary kiln. Furthermore, the support members 3 can be installed in blocks, with dimensions of 300mm to 500mm in length, 300mm to 500mm in width, and 150mm to 300mm in thickness, forming square pieces. Their main function is to fix the inner steel liner under the support of the outer wall 4 of the kiln. The aforementioned support members 3, under the support of the outer wall 4 of the kiln, fix the inner steel liner 5, thereby reducing heat loss, lowering production costs, and increasing the overall service life of the refractory insulation lining.
[0053] Furthermore, the block refractory components are arranged at intervals of 1000mm-2000mm along the length of the rotary kiln, and at equal intervals of 120° along the circumference of the rotary kiln.
[0054] Specifically, the block refractory components are placed with a spacing of 1000 mm to 2000 mm along their length. This spacing is chosen to ensure the stability of the support structure and effective management of material thermal expansion. An overly dense arrangement may increase material costs and construction difficulty, while also restricting heat flow within the kiln and affecting heating efficiency; conversely, an overly sparse arrangement may result in insufficient support, affecting the stability and service life of the inner steel liner 5. Therefore, this spacing range is an optimized solution determined after comprehensive consideration. Placing them at a 120° angle along the arc direction not only ensures uniform support of the inner steel liner 5 in the circumferential direction but also contributes to the uniform distribution of heat, reducing stress concentration and deformation problems caused by localized overheating or uneven cooling. The 120° interval means that there are at least three support points on the cross-section of each kiln body. This distribution provides good structural stability while facilitating construction and maintenance, as the distance between each support point is relatively uniform, making installation and inspection easier. Furthermore, this arrangement helps improve the overall rigidity and deformation resistance of the rotary kiln, especially in high-temperature operating environments, effectively resisting thermal stress caused by temperature changes and extending the service life of the rotary kiln. In summary, the arrangement strategy of block refractory components not only considers the stability and thermal efficiency of the supporting structure, but also takes into account the convenience and economy of construction, which is an important technical guarantee for achieving efficient and stable operation of rotary kilns.
[0055] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.
[0056] The above provides a detailed description of the heat-insulating refractory lining structure and the cascade rotary kiln provided by this utility model. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of this utility model.
Claims
1. An insulating refractory lining structure, characterized by, The heat insulation paving layer (1) and the refractory fiber module (2) are fixed to the connecting part by the bolt connecting piece.
2. A thermally insulated refractory lining structure according to claim 1, characterized in that The heat insulation paving layer (1) comprises at least one of nano plate, ceramic fiber blanket and ceramic fiber plate, and the thickness of the heat insulation paving layer (1) is 10-50 mm.
3. A thermally insulated refractory lining structure according to claim 2, characterized in that The heat insulation paving layer (1) comprises composite nano plate and ceramic fiber blanket or composite ceramic fiber blanket and ceramic fiber plate.
4. A thermally insulated refractory lining structure according to claim 1, wherein The refractory fiber module (2) is ceramic fiber module, aluminum silicate fiber module or alumina fiber module, and the thickness of the refractory fiber module (2) is 150-300 mm.
5. A thermally insulated refractory lining structure according to any one of claims 1-4, characterized in that The bolt connecting piece comprises a plurality of stainless steel bolts arranged at equal intervals.
6. A thermally insulated refractory lining structure according to claim 5, wherein The arrangement interval of the plurality of stainless steel bolts is 200-350 mm.
7. A cascade rotary kiln comprising a kiln body outer wall (4) and an inner steel shell (5) disposed within the kiln body outer wall (4), characterised in that, The kiln body outer wall (4) and the inner steel cylinder (5) are provided with the heat insulation refractory lining structure as claimed in any one of claims 1-6.
8. A cascade rotary kiln according to claim 7, characterised in that, The connecting part is the kiln body outer wall (4).
9. A cascade rotary kiln according to any one of claims 7 or 8, characterised in that, The kiln body outer wall (4) and the inner steel cylinder (5) are provided with the support piece (3), and the support piece (3) comprises a plurality of block-shaped refractory pieces arranged uniformly between the kiln body outer wall (4) and the inner steel cylinder (5), the length of the block-shaped refractory piece is 300-500 mm, the width of the block-shaped refractory piece is 300-500 mm, and the thickness of the block-shaped refractory piece is 150-300 mm.
10. A cascade rotary kiln according to claim 9, wherein, The arrangement interval of the block-shaped refractory piece in the length direction of the rotary kiln is 1000-2000 mm, and the block-shaped refractory piece is arranged at equal intervals in the circumferential direction of the rotary kiln at an angle of 120°.