Rotary kiln head device and sealing method

Abstract

This invention provides a rotary kiln head device and sealing method, including a kiln head cylinder assembly, a sealing device, a kiln head end face assembly, and a feed cylinder. The kiln head end face assembly is fixedly connected to the feed cylinder, and the kiln head cylinder assembly and the kiln head end face assembly are connected by the sealing device. The sealing device includes a labyrinth-type sealing module, a graphite ring sealing module, and a multi-layer composite fish scale sealing module. This invention eliminates the need for a kiln head hood, resulting in a simple device structure. Based on this, a triple seal is employed: a labyrinth-type seal, a graphite ring seal, and a multi-layer composite fish scale seal. The labyrinth seal effectively prevents materials, fly ash, and high-temperature flue gas from entering the sealing gaps and corroding the graphite ring. The graphite ring seal prevents internal high-temperature flue gas from escaping and external air from entering, maintaining stable negative pressure at the kiln head. The multi-layer composite fish scale seal ensures that the feed cylinder and the kiln head end face assembly can rotate smoothly relative to the kiln head cylinder assembly during operation, while simultaneously enhancing the sealing performance and stability.

Description

Technical Field

[0001] This invention belongs to the field of hazardous waste incineration technology, and specifically relates to a rotary kiln head device and sealing method for hazardous waste incineration. Background Technology

[0002] In recent years, with the acceleration of urbanization and industrialization, as well as increasingly stringent environmental policies, my country's hazardous waste production and disposal demand will continue to grow. Currently, my country's hazardous waste treatment and disposal mainly focuses on resource utilization and harmless treatment.

[0003] In recent years, hazardous waste incineration and secure landfill technologies have matured, while cement kiln co-processing has developed rapidly, becoming an effective supplement to harmless and resource-based utilization. However, co-processing is significantly limited by the operating conditions of industrial kilns. Although industrial kilns operate at high temperatures, the thermochemical and thermal treatment processes and mechanisms for co-processing various types of hazardous waste require further research. Furthermore, industrial kilns have specific operating conditions, process regulations, and disciplinary requirements, thus limiting the types and quantities of waste suitable for co-processing in industrial kilns. Currently, hazardous waste kiln treatment remains the mainstream method.

[0004] A hazardous waste rotary kiln system generally consists of a rotary kiln shell, kiln head and kiln tail components, transmission components, and a supporting feeding mechanism. Hazardous waste rotary kilns evolved from cement rotary kilns, and traditional rotary kilns use a kiln head hood and fish-scale seal. This kiln head hood and seal method has several drawbacks. First, because it covers the rotary kiln shell, it occupies a large space and is heavy, requiring an independent foundation to support the kiln head hood. Second, the lower end of the kiln head hood has a material leakage (ash) port, leading to significant hazardous waste backflow during operation. Some flammable, volatile, or corrosive waste falls into the kiln, posing a safety hazard and significantly impacting the on-site environment. Summary of the Invention

[0005] To address the above problems, a new kiln head design was invented that eliminates the kiln head hood and material discharge port. This design solves the problem of material leakage at the kiln head and environmental pollution. Simultaneously, a new sealing method, employing triple sealing, is used to maintain the kiln head's sealing effect.

[0006] The specific technical solution adopted in this invention is as follows: A rotary kiln head device includes a kiln head cylinder assembly, a sealing device, a kiln head end face assembly, and a feed cylinder. The kiln head end face assembly is fixedly connected to the feed cylinder, and the kiln head cylinder assembly and the kiln head end face assembly are connected by the sealing device. The sealing device includes a labyrinth-type sealing module, a graphite ring sealing module, and a multi-layer composite fish-scale sealing module. The labyrinth-type sealing module consists of several labyrinth rings, which are arranged alternately on both sides of the rear wall of the gap formed by the kiln head cylinder assembly and the kiln head end face assembly, making the gap channel a labyrinth. Structure: The graphite ring sealing module includes several graphite rings and a sealing and pressing device. The graphite rings are arranged sequentially at the front end of the gap formed by the kiln head cylinder assembly and the kiln head end face assembly. The sealing and pressing device is fixed on the kiln head end face assembly and is used to press the graphite rings. The multi-layer composite fish scale sealing module includes multi-layer composite fish scales, a tensioning ring and a contact plate. The contact plate has a cylindrical structure and is fixedly connected to the sealing and pressing device. One end of the multi-layer composite fish scales contacts the contact plate and is tightened by the tensioning ring, while the other end is fixed on the kiln head cylinder assembly.

[0007] The labyrinth-type sealing module effectively prevents backflow of material and mitigates high-temperature corrosion and damage to the sealing components caused by the backflow of high-temperature flue gas; the labyrinth structure provides the first layer of sealing. The graphite ring sealing module uses several elastic graphite rings, filling and pressing them into the sealing gap. The graphite ring seal, combined with the pressing assembly, provides the second layer of sealing. The multi-layer composite fish-scale sealing module features a double-layer fish-scale design. The inner layer is a wear-resistant layer made of special wear-resistant and high-temperature-resistant fish-scale material, thickened at contact friction points to improve service life; the middle layer is filled with a carbon-silicon-aluminum fiber composite board to enhance sealing flexibility; the outer layer uses corrosion-resistant fish-scale material, primarily protecting the inner layer and fixing the tensioning device to tighten the sealing ring overall. This multi-layer composite fish-scale design provides the third layer of sealing.

[0008] Furthermore, the kiln head cylinder assembly includes a structure consisting of an inner baffle, a vertical plate, and an outer ring, and a refractory filling the structure. The inner baffle and the outer ring are coaxial columnar structures, while the vertical plate is a ring-shaped structure. The inner and outer ring edges of the vertical plate are fixed to one end of the inner baffle and the outer ring, respectively. The other end of the inner baffle is constructed with refractory at a 30-50° slope, forming an inverted J-shaped inward snap to prevent hazardous waste from falling back into the sealing gap and corroding or wearing the sealing components.

[0009] Furthermore, the kiln head end face assembly includes an inner end face baffle and an end face panel. The inner end face baffle and the inner cylinder baffle are coaxial columnar structures, and the end face panel is a disc-shaped structure. The outer ring edge of the end face panel is fixed to one end of the inner end face baffle. The end face panel has an opening in the middle, and the feed cylinder is inserted into and passes through the end face panel. The kiln head end face assembly is supported by the feed cylinder or by a separate support column set on the end face panel.

[0010] Furthermore, the sealing and clamping device includes an outer retaining ring, a clamping spring, a fixing plate, a clamping pin, and a positioning and clamping device. The positioning and clamping device includes a fixing bolt, a first positioning plate, a clamping bolt, a second positioning plate, and a contact plate. The outer retaining ring is a circular ring-shaped structure, positioned on the outermost side of the gap formed by the kiln head cylinder assembly and the kiln head end face assembly. One end of the clamping spring is fixed to one side of the outer retaining ring, and the other end is fixedly connected to the bottom end of the clamping pin. The top end of the clamping pin is fixedly connected to the clamping bolt. The first positioning plate has a through hole that mates with the clamping pin. The second positioning plate is threadedly connected to the clamping bolt. The first and second positioning plates are fixedly connected by two coaxial columnar plates. The first positioning plate and the fixing plate are fixed to the end face panel by fixing bolts.

[0011] Furthermore, the annular width of the maze rings (first maze ring, second maze ring, inner baffle ring) and outer baffle ring is slightly smaller than the gap width formed by the kiln head cylinder assembly and the kiln head end face assembly, leaving room for expansion and contraction.

[0012] Furthermore, the first positioning plate, the second positioning plate, and the contact plate adopt a multi-segment structure.

[0013] Furthermore, the multi-layer composite fish scale is composed of two layers of fish scale filled with a carbon silicon aluminum fiber composite board.

[0014] Based on the same inventive concept, this invention also provides a rotary kiln head sealing method, wherein the kiln head cylinder assembly and the kiln head end face assembly are connected by a sealing device; the sealing device includes a labyrinth sealing module, a graphite ring sealing module, and a multi-layer composite fish scale sealing module; wherein, the labyrinth sealing module is composed of several labyrinth rings, which are arranged alternately on both sides of the rear wall of the gap formed by the kiln head cylinder assembly and the kiln head end face assembly, making the gap channel a labyrinth structure; the graphite ring sealing module includes several graphite rings and a sealing and pressing device, which are arranged sequentially at the front end of the gap formed by the kiln head cylinder assembly and the kiln head end face assembly, and the sealing and pressing device is fixed on the kiln head end face assembly to press the graphite rings; the multi-layer composite fish scale sealing module includes multi-layer composite fish scales, a tensioning ring, and a contact plate, the contact plate is a cylindrical structure, the contact plate is fixedly connected to the sealing and pressing device, one end of the multi-layer composite fish scales contacts the contact plate and is tightened by the tensioning ring, and the other end is fixed to the kiln head cylinder assembly.

[0015] The beneficial effects of this invention are: The kiln head device of the present invention has no kiln head cover, which saves kiln head space, simplifies the kiln head structure, and eliminates the need for an independent foundation for the kiln head cover, resulting in a simple device structure.

[0016] The kiln head device of this invention has no material discharge port and is sealed to prevent ash discharge. By combining the arrangement of the kiln head feed port (insertion depth), the sealing method (maze-type partition), and the refractory masonry method (inverted J-shaped slope masonry), the backflow of material and ash at the kiln head are avoided.

[0017] This invention employs a triple sealing method: a labyrinth seal, double graphite rings, and multi-layer composite fish-scale seals. The labyrinth seal effectively prevents materials, fly ash, and high-temperature flue gas from entering the sealing gaps and corroding the graphite rings, thus extending the service life of the double graphite rings and ensuring sealing performance. The double graphite rings utilize two flexible graphite ring seals to prevent internal high-temperature flue gas from escaping and external air from entering, maintaining stable negative pressure at the kiln head. The multi-layer composite fish-scale seals reinforce the double graphite ring seal, enhancing the stability of the sealing performance.

[0018] The sealing and clamping device of this invention adopts a multi-section structure, which allows for quick disassembly and installation. It solves the problems of large size, heavy weight, and high manpower and material costs of the device; as well as the problems of numerous and complex devices in the kiln head space, and the difficulty in moving and disassembling the clamping components due to limitations imposed by the feed cylinder, air ducts, etc., during installation and maintenance. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the kiln head device of the present invention; Figure 2 This is a schematic diagram of the components of the sealing device of the present invention; Figure 3 This is an axial view of some components of the present invention; 1. Kiln head cylinder assembly; 2. Sealing device; 3. Kiln head end face assembly; 4. Feed cylinder; 101. Inner baffle of the cylinder; 102. Vertical plate of the cylinder; 201. First labyrinth ring; 202. Second labyrinth ring; 203. Inner retaining ring; 204. First graphite ring; 205. Second graphite ring; 206. Outer retaining ring; 207. Compression spring; 208. Fixing plate; 209. Compression pin; 210. Positioning and clamping device; 211. First fish scale plate; 212. Tensioning ring; 213. Carbon silicon aluminum composite plate; 214. Second fish scale plate; 215. Scale positioning bolt; 216. Scale positioning plate; 301. Inner baffle of the end face; 302. End panel; 2101. Fixing bolt; 2102. First positioning plate; 2103. Compression bolt; 2104. Second positioning plate; 2105. Contact plate. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0021] like Figure 1 and Figure 2As shown, the rotary kiln head device of the present invention includes a kiln head cylinder assembly 1; a sealing device 2; a kiln head end face assembly 3; and a feed cylinder 4. The kiln head cylinder assembly 1 mainly consists of an inner baffle 101, a vertical plate 102, and an outer ring. The inner baffle 101 and the outer ring are coaxial columnar structures, while the vertical plate 102 is a ring-shaped structure. The inner and outer ring edges of the vertical plate 102 are fixed to one end of the inner baffle 101 and the outer ring, respectively. The outer ring is lined with castable refractory. The other end of the inner baffle 101 is lined with castable refractory at a 30-50° slope towards the outer ring, forming an inverted J-shaped inward buckle. This reduces the dead corner of the kiln head, prevents material accumulation in the dead corner, and prevents material from returning to the sealing device 2. The actual slope selection depends on the characteristics of the incinerated material. The inner baffle 101 is made of heat-resistant steel plate. The kiln head end face assembly 3 includes an inner end face baffle 301 and an end face panel 302. The inner end face baffle 301 is made of heat-resistant steel and is coaxial with the inner baffle 101 of the cylinder. The end face panel 302 is a disc-shaped structure. The outer periphery of the end face panel 302 is fixed to one end of the inner end face baffle 301, and the end face panel 302 has an opening in the middle. The feed cylinder 4 is the main feed cylinder of the rotary kiln, which mainly serves two functions: supporting the kiln head end face assembly 3 and providing a feeding channel. The feed cylinder 4 passes through the opening of the end face panel 302 and is inserted into the kiln, extending beyond the inner side of the end face panel to pour refractory material, preventing material from falling back into the sealing structure. Alternatively, a separate support column can be installed on the end face panel 302 to support the kiln head end face assembly 3. In the rotary kiln head device of the present invention, the kiln head cylinder assembly 1 and the kiln head end face assembly 3 are connected by a sealing device 2. While ensuring the operation of the rotary kiln head device, the kiln head end face assembly 3 can rotate smoothly relative to the kiln head cylinder assembly 1 while simultaneously achieving a seal, ensuring that internal high-temperature flue gas escapes and external air enters, thus maintaining stable negative pressure at the kiln head. Specifically, as... Figure 1 and Figure 2 As shown, the sealing device 2 includes a labyrinth sealing module, a graphite ring sealing module, and a multi-layer composite fish scale sealing module; wherein, the labyrinth sealing module is composed of several labyrinth rings, which are arranged alternately on both sides of the rear wall of the gap formed by the kiln head cylinder assembly 1 and the kiln head end face assembly 3, so that the gap channel forms a labyrinth structure. Figure 2 The diagram shows a labyrinthine sealing module consisting of three labyrinth rings—a first labyrinth ring 201, a second labyrinth ring 202, and an inner retaining ring 203. Figure 2As shown, the first maze ring 201, the second maze ring 202, and the inner baffle ring 203 are circular ring-shaped structures. The outer ring diameter of the first maze ring 201 and the inner baffle ring 203 is the same as the inner diameter of the inner baffle 101 inside the cylinder. The inner ring diameter of the second maze ring 202 is the same as the outer diameter of the inner baffle 301 on the end face. The outer ring edge of the first maze ring 201 is fixed to the inner baffle 101 inside the cylinder and has a gap with the inner baffle 301 on the end face. The inner ring edge of the second maze ring 202 is fixed to the inner baffle 301 on the end face and has a gap with the inner baffle 101 inside the cylinder. The outer ring edge of the inner baffle ring 203 is fixed to the inner baffle 101 inside the cylinder and has a gap with the inner baffle 301 on the end face. The first maze ring 201, the second maze ring 202, and the inner baffle ring 203 are arranged alternately to form a maze structure. The first labyrinth ring 201, the second labyrinth ring 202, and the inner retaining ring 203 are made of heat-resistant steel to prevent contact with high-temperature flue gas and avoid high-temperature thermal deformation. The labyrinth-type sealing module is the first barrier of the sealing device 2. On the one hand, it reduces the thermal shock and flue gas corrosion of the graphite ring component in the graphite ring sealing module caused by high-temperature flue gas. On the other hand, it blocks materials and fly ash from entering the graphite ring and preventing it from aggravating wear and chemical corrosion.

[0022] The graphite ring sealing module comprises several graphite rings and a sealing and pressing device, and is also an important component of the sealing device 2. Several graphite rings are sequentially arranged at the front end of the gap formed by the kiln head cylinder assembly 1 and the kiln head end face assembly 3. The sealing and pressing device is fixed to the kiln head end face assembly 3 to press the graphite rings. The graphite rings are made of elastic material and can fit well against the upper and lower steel plates—the inner baffle 101 of the cylinder and the inner baffle 301 of the end face—achieving a sealing effect. The number of graphite rings can be set according to requirements. Figure 2 Two are shown, including a first graphite ring 204 and a second graphite ring 205; the sealing and clamping device can be of various types, and this embodiment shows a sealing and clamping device that uses a clamping spring and a pin, such as... Figure 2 As shown, it includes an outer retaining ring 206, a compression spring 207, a fixing plate 208, a compression pin 209, and a positioning and pressing device 210. The positioning and pressing device 210 includes a fixing bolt 2101, a first positioning plate 2102, a pressing bolt 2103, a second positioning plate 2104, and two coaxial columnar plates. One end of the compression spring 207 is fixed to one side of the outer retaining ring 206, and the other end is fixedly connected to the bottom end of the compression pin 209. The top end of the compression pin 209 is fixedly connected to the compression bolt 2103. The first positioning plate 2102 has a through hole that mates with the compression pin 209, allowing the first positioning plate 2102 to be movably connected to the compression pin 209. The second positioning plate 2104 is threadedly connected to the compression bolt 2103. The first positioning plate 2102 and the second positioning plate 2104 are fixedly connected by two coaxial columnar plates. The first positioning plate 2102 and the fixing plate 208 are fixed to the end panel 302 by fixing bolts 2101. Figure 2As shown, the clamping effect is achieved by adjusting the clamping bolt 2103, which transmits the force to the clamping pin 209 and the clamping spring 207, and finally, the outer retaining ring 206 presses against the second graphite ring 205 and the first graphite ring 204. The clamping spring 207 also acts as a buffer when the graphite ring shifts due to uneven force at different parts of the kiln head, maintaining the graphite ring in a clamped state at all times. After long-term wear, if the graphite ring loosens, resulting in a poor sealing effect, the clamping bolt 2103 can be tightened to clamp the graphite ring and ensure the sealing effect.

[0023] The multi-layer composite fish scale sealing module consists of a contact plate 2105, a first fish scale 211, a tension ring 212, a carbon silicon aluminum composite plate 213, a second fish scale 214, scale positioning bolts 215, and a scale positioning plate 216. The contact plate 2105 is cylindrical and fixedly connected to the second positioning plate 2104. The first fish scale 211 and the second fish scale 214 are filled with a carbon silicon aluminum fiber composite plate 213, forming a multi-layer composite fish scale to improve the flexibility of the seal and cope with the vertical movement and horizontal swaying of the rotary kiln. The inner side of one end of the multi-layer composite fish scale, i.e., the first fish scale 211, contacts the contact plate 2105, and the contact surface is in a state of friction; therefore, the first fish scale 211 and the contact plate 2105 are made of wear-resistant material. The outer side of the multi-layer composite fish scale, namely the second fish scale 214, is made of corrosion-resistant material due to its long-term exposure to the hazardous waste disposal environment. Additionally, the second fish scale 214 has a tension ring 212, composed of a spring and a steel wire rope, which is fastened to the outside of the multi-layer composite fish scale to maintain a tight fit between the multi-layer composite fish scale and the contact plate 2105, ensuring the tightness of the fish scale sealing structure. The other end of the multi-layer composite fish scale is fixed to the kiln head cylinder assembly 1 via scale positioning bolts 215 and scale positioning plates 216. This multi-layer composite fish scale is the final sealing element of the sealing device 2, primarily ensuring that the kiln head end face assembly 3 can rotate smoothly relative to the kiln head cylinder assembly 1 during the operation of the rotary kiln head device, while simultaneously strengthening the seal and guaranteeing the sealing effect.

[0024] Furthermore, since the gap section formed by the kiln head cylinder assembly 1 and the kiln head end face assembly 3 is a circular cross-section, the positioning and clamping device 210 is also a circular structure to ensure a sealing effect. Figure 3 As shown, Figure 3 This is an axial view of a partial sealing assembly. The first positioning plate 2102 and the second positioning plate 2104 are both annular plate structures, on which multiple clamping springs 207, clamping pins 209, and clamping bolts 2103 are installed for fixation and control. Furthermore, the first positioning plate 2102, the second positioning plate 2104, and the contact plate 2105 adopt a multi-segment structure, which can be divided into 2, 3, or 4 segments depending on the size of the kiln and the kiln head arrangement conditions, facilitating quick disassembly and installation.

[0025] The rotary kiln head device of this invention eliminates the need for a kiln head hood, saving kiln head space, simplifying the kiln head structure, and eliminating the need for an independent foundation for the kiln head hood, resulting in a concise device structure. Based on this, a sealing device 2 achieves a triple seal: a labyrinth-style seal with double graphite rings and multi-layer composite fish-scale seals. The labyrinth-style seal effectively prevents materials, fly ash, and high-temperature flue gas from entering the sealing gaps and corroding the graphite rings, thus improving the service life of the double graphite rings and ensuring a good seal. The double graphite rings employ two flexible graphite ring seals to prevent internal high-temperature flue gas from escaping and external air from entering, maintaining stable negative pressure at the kiln head. The multi-layer composite fish-scale seals, based on the double graphite ring seals, enhance the seal while ensuring the kiln head end face assembly 3 can rotate smoothly relative to the kiln head cylinder assembly 1 during operation, thereby improving the stability of the sealing performance.

[0026] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A rotary kiln head device, characterized in that, The system includes a kiln head cylinder assembly, a sealing device, a kiln head end face assembly, and a feed cylinder. The kiln head end face assembly is fixedly connected to the feed cylinder, and the kiln head cylinder assembly and the kiln head end face assembly are connected by the sealing device. The kiln head end face assembly includes an inner end face baffle and an end face panel. The inner end face baffle and the kiln head cylinder assembly are coaxial columnar structures, while the end face panel is a disc-shaped structure. The outer periphery of the end face panel is fixed to one end of the inner end face baffle. An opening is located in the center of the end face panel, through which the feed cylinder is inserted and passes. The kiln head end face assembly is supported by the feed cylinder or has a separate support on the end face panel. Support column for support; the sealing device includes a labyrinth sealing module, a graphite ring sealing module, and a multi-layer composite fish scale sealing module; wherein, the labyrinth sealing module is composed of several labyrinth rings, which are arranged alternately on both sides of the rear wall of the gap formed by the kiln head cylinder assembly and the kiln head end face assembly, making the gap channel a labyrinth structure; the graphite ring sealing module includes several graphite rings and a sealing and pressing device, which are arranged sequentially at the front end of the gap formed by the kiln head cylinder assembly and the kiln head end face assembly, and the sealing and pressing device is fixed to the kiln. On the head end assembly, a graphite ring is used for pressing; the multi-layer composite fish scale sealing module includes multi-layer composite fish scales, a tensioning ring, and a contact plate. The contact plate has a cylindrical structure and is fixedly connected to the sealing and pressing device. One end of the multi-layer composite fish scales contacts the contact plate and is tightened by the tensioning ring, while the other end is fixed to the kiln head cylinder assembly; the sealing and pressing device includes an outer retaining ring, a pressing spring, a fixing plate, a pressing pin, and a positioning pressing device, wherein the positioning pressing device includes a fixing bolt, a first positioning plate, a pressing bolt, and a second positioning... The system consists of a plate and two coaxial columnar plates; the outer retaining ring is a circular plate structure, located on the outermost side of the gap formed by the kiln head cylinder assembly and the kiln head end face assembly; one end of the compression spring is fixed to one side of the outer retaining ring, and the other end is fixedly connected to the bottom end of the compression pin; the top end of the compression pin is fixedly connected to the compression bolt; the first positioning plate has a through hole that mates with the compression pin; the second positioning plate is threadedly connected to the compression bolt; the first positioning plate and the second positioning plate are fixedly connected by two coaxial columnar plates; the first positioning plate and the fixing plate are fixed to the end panel by fixing bolts.

2. The rotary kiln head device according to claim 1, characterized in that, The kiln head cylinder assembly includes a structure consisting of an inner baffle, a vertical plate, and an outer ring, and a refractory filling the structure. The inner baffle and the outer ring are coaxial columnar structures, while the vertical plate is a ring-shaped structure. The inner and outer ring edges of the vertical plate are fixed to one end of the inner baffle and the outer ring, respectively. The other end of the inner baffle is lined with refractory at a 30-50° slope, forming an inverted J-shaped slope.

3. The rotary kiln head device according to claim 1, characterized in that, The width of the maze ring and the outer baffle ring is smaller than the width of the gap formed by the kiln head cylinder assembly and the kiln head end face assembly.

4. The rotary kiln head device according to claim 1, characterized in that, The first positioning plate, the second positioning plate, and the contact plate adopt a multi-segment structure.

5. The rotary kiln head device according to claim 1, characterized in that, The multi-layer composite fish scale consists of two layers of fish scale filled with a carbon silicon aluminum fiber composite board.

Images