Refractory lining structure of coal injection duct for rotary cement kiln

Abstract

The utility model provides a fire-resistant lining structure of a coal-injection duct for a rotary cement kiln, which relates to the technical field of cement kiln equipment and comprises an anti-coking baffle, a first anchoring part, a fire-resistant prefabricated part and a fire-resistant pouring material. The anti-coking baffle is arranged at the end part of the pipe body; the multiple first anchoring parts are sequentially arranged at intervals in the circumferential direction of the pipe body; the multiple fire-resistant prefabricated parts are sequentially connected in the circumferential direction of the pipe body to form an annular structure, the fire-resistant prefabricated parts abut against the anti-coking baffles, and the fire-resistant prefabricated parts are connected with the first anchoring parts in a one-to-one correspondence mode; and the refractory casting material is filled between the outer wall of the pipe body and the refractory prefabricated part. The fireproof prefabricated part is fixed to the periphery of the pipe body through the first anchoring part, the fireproof pouring material is arranged between the fireproof prefabricated part and the outer wall of the pipe body, the anti-coking baffle can protect the fireproof lining structure, the oxidizing atmosphere can be isolated from the end face of the pipe body, and meanwhile the fireproof lining structure is prevented from being damaged and falling off too early due to high-temperature ablation.

Description

Technical Field

[0001] The utility model relates to the technical field of cement kiln equipment, in particular to a refractory lining structure of a coal injection pipe used in a cement rotary kiln. Background Art

[0002] Cement production requires high-temperature calcination, and the calorific fuel is delivered to the cement kiln through coal injection pipes. These pipes control the speed and direction of the pulverized coal injection for efficient combustion. Located inside the kiln, with its head closest to the flame, these pipes are covered with a refractory lining to protect their proper operation.

[0003] In the related art, when setting a refractory lining structure at the head of a coal injection pipe, it is necessary to first set ordinary V-shaped or other heat-resistant steel anchors on the outside of the coal injection pipe, and then cover the outer periphery of the coal injection pipe with unshaped refractory castables.

[0004] However, the pulverized coal injection pipe head, as it is closest to the flame, operates at temperatures exceeding the industry's typical secondary air temperature of 1150°C. The end face temperature, depending on operating conditions, typically ranges from 1150°C to 1400°C, making it the shortest refractory component in the entire system. According to statistics, the industry average lifespan is 4-6 months. With the development of the industry, the concentration of hazardous chemical elements from co-processing and diversified fuels has increased, making the operating conditions at the pulverized coal injection pipe head increasingly harsh. Existing refractory linings often suffer from premature failure and disassembly due to high-temperature erosion, mechanical cleaning of chemical coke buildup, and failure of the anchoring system. Furthermore, the refractory castable lining is hardened using cement or sol-gel methods, and the rapid temperature rise after material addition makes on-site construction difficult to control. This leads to cracking, low refractory lining density, erratic sinter phases, poor high-temperature wear resistance and chemical corrosion resistance, and an inability to effectively block hazardous chemical elements. Consequently, frequent kiln shutdowns for maintenance impact production efficiency and result in economic losses. Utility Model Content

[0005] The utility model provides a refractory lining structure for a coal injection pipe of a cement rotary kiln, which is used to solve the defects of the prior art refractory lining structure that may be damaged or fall off prematurely due to high temperature ablation, mechanical cleaning of chemical coking and failure of the anchoring system.

[0006] According to the utility model, a refractory lining structure of a coal injection pipe for a cement rotary kiln is provided. The refractory lining structure of the coal injection pipe is used for the coal injection pipe. The coal injection pipe includes a pipe body. The refractory lining structure of the coal injection pipe includes:

[0007] an anti-coking baffle, the anti-coking baffle being arranged at an end of the tube body and extending outwardly in a radial direction of the tube body;

[0008] a first anchoring piece, wherein the number of the first anchoring pieces is plural and the first anchoring pieces are sequentially spaced apart and arranged on the outer wall of the tube body along the circumferential direction of the tube body;

[0009] A plurality of refractory prefabricated parts are connected in sequence along the circumferential direction of the tube body to form an annular structure and are sleeved on the outer circumference of the tube body. The refractory prefabricated parts abut against the anti-coking baffle, and each of the refractory prefabricated parts is connected to the first anchor piece in a one-to-one correspondence;

[0010] Refractory castable material is filled between the outer wall of the tube body and the refractory prefabricated part.

[0011] According to the utility model, a refractory lining structure of a coal injection pipe for a cement rotary kiln is provided, which also includes a second anchor. There are multiple second anchors, and the multiple second anchors are arranged in sequence on the outer wall of the pipe body at intervals along the circumferential direction of the pipe body. The second anchor is located on the inner side of the refractory prefabricated part.

[0012] According to a refractory lining structure of a coal injection pipe for a cement rotary kiln provided by the utility model, the second anchor is a seagull-shaped anchor, the second anchor is fixedly arranged on the outer wall of the pipe body at an angle to the axial direction of the pipe body, and the second anchor and the first anchor are arranged in sequence at intervals in the circumferential direction of the pipe body.

[0013] According to a refractory lining structure of a coal injection pipe for a cement rotary kiln provided by the utility model, the refractory prefabricated part includes: a main body and a clamping portion, the clamping portion is arranged on the inner wall of the main body facing the pipe body, the clamping portion is connected to the first anchor, and the main bodies of adjacent refractory prefabricated parts are sequentially connected to each other along the circumferential direction of the pipe body.

[0014] According to a refractory lining structure of a coal injection pipe for a cement rotary kiln provided by the utility model, the first anchoring piece includes: a support plate, a first extension plate and a second extension plate,

[0015] The support plate is fixedly connected to the outer wall of the tube body, the first extension plate and the second extension plate are respectively connected to opposite sides of the support plate, and the side of the first extension plate away from the support plate and the side of the second extension plate away from the support plate extend outwardly along the radial direction of the tube body and approach each other;

[0016] The clamping portion has a first abutting surface and a second abutting surface in the circumferential direction of the tube body, wherein a side of the first abutting surface away from the body and a side of the second abutting surface away from the body extend inwardly along the radial direction of the tube body and are away from each other;

[0017] The clamping portion is clamped between the first extension plate and the second extension plate, the first abutting surface abuts against the first extension plate, and the second abutting surface abuts against the second extension plate.

[0018] According to the utility model, a refractory lining structure of a coal injection pipe for a cement rotary kiln further includes a nano-insulation plate. An insulation gap is provided between the clamping portion and the support plate, and the nano-insulation plate is arranged in the insulation gap.

[0019] According to a refractory lining structure of a coal injection pipe for a cement rotary kiln provided by the utility model, the main body is respectively provided with a protrusion and a groove on both sides of the circumferential direction of the pipe body, the shape of the protrusion and the shape of the groove match each other, and the protrusion on the main body of the refractory prefabricated part is clamped into the groove on the main body of another adjacent refractory prefabricated part in the circumferential direction of the pipe body.

[0020] According to a refractory lining structure of a coal injection pipe for a cement rotary kiln provided by the utility model, the anti-coking baffle has an expansion gap extending in the radial direction of the pipe body.

[0021] According to a refractory lining structure of a coal injection pipe for a cement rotary kiln provided by the utility model, the refractory prefabricated parts are arranged adjacent to each other in sequence in the axial direction of the pipe body, and multiple refractory prefabricated parts form at least three rows of adjacent annular structures in the axial direction of the pipe body. The total length of the at least three rows of adjacent annular structures formed by the multiple refractory prefabricated parts in the axial direction of the pipe body is not less than 500 mm.

[0022] The present invention provides a refractory lining structure for a coal injection pipe in a cement rotary kiln, comprising an anti-coking baffle, a first anchor, a refractory prefabricated component, and a refractory castable material. Compared to the prior art, the refractory prefabricated component can be fixed to the outer periphery of the pipe body via the first anchor, and the refractory castable material can be disposed between the refractory prefabricated component and the outer wall of the pipe body. Furthermore, the anti-coking baffle protects the refractory lining structure, thereby isolating the pipe end face from the oxidizing atmosphere while effectively preventing premature damage and dislodging of the refractory lining structure due to high-temperature erosion, mechanical cleaning of chemical coking, and failure of the anchoring system.

[0023] Based on the above technical solution, the utility model has the following advantages:

[0024] (1) The refractory lining material structure is reasonably designed and highly operable, which can realize the modular installation of high-performance prefabricated parts of coal injection pipes, effectively avoiding the problem of difficult quality control of traditional refractory castables, and at the same time, saving the cost of making molds on the construction site;

[0025] (2) The anchoring structure can achieve the purpose of increasing the insulation layer and reducing the heat load, which is safer than the traditional single V-shaped anchoring solution;

[0026] (3) The refractory lining structure can achieve sealing interlocking and multi-layer protection functions, which is safe and reliable;

[0027] (4) The solution of the utility model can adapt to the current working conditions of cement kilns, solve the problem of short life of traditional refractory castable lining structures, thereby greatly reducing economic losses, effectively improving the safe operation cycle of cement kiln coal injection pipe equipment, and solving the problem of the barrel effect of the refractory system. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 The present invention is a schematic structural diagram of a refractory lining structure of a coal injection pipe for a cement rotary kiln according to one embodiment of the present invention.

[0030] Figure 2 yes Figure 1 A cross-sectional view of the refractory lining structure of a coal injection pipe for a cement rotary kiln is shown in FIG.

[0031] Figure 3 The present invention is a schematic structural diagram of a refractory prefabricated component in a refractory lining structure of a coal injection pipe for a cement rotary kiln according to one embodiment of the present invention.

[0032] Figure 4 The present invention is a schematic structural diagram of a first anchoring piece in a refractory lining structure of a coal injection pipe for a cement rotary kiln according to one embodiment of the present invention.

[0033] Reference numerals:

[0034] 100. Tube body; 200. Anti-coking baffle; 300. First anchor; 310. Support plate; 320. First extension plate; 330. Second extension plate; 400. Refractory prefabricated part; 410. Main body; 420. Clamping portion; 421. First abutting surface; 422. Second abutting surface; 423. Mounting surface; 430. Protrusion; 440. Groove portion; 500. Second anchor; 600. Nano-insulation board. DETAILED DESCRIPTION

[0035] To make the purpose, technical solutions, and advantages of the present invention more clear, the following will be combined with the accompanying drawings to clearly and completely describe the technical solutions of the present invention. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] In one embodiment according to the present invention, a refractory lining structure of a coal injection pipe for a cement rotary kiln is provided, and the refractory lining structure of the coal injection pipe can be arranged on the outside of the pipe body of the coal injection pipe, and the refractory lining structure of the coal injection pipe includes an anti-coking baffle, a first anchor, a refractory prefabricated part and a refractory castable material. The anti-coking baffle is arranged at the end of the pipe body, and a plurality of refractory prefabricated parts are sequentially connected to form an annular structure and sleeved on the outer periphery of the pipe body. Each refractory prefabricated part can be fixed to the outside of the pipe body by a first anchor, and the refractory castable material is filled between the outer wall of the pipe body and the refractory prefabricated layer. In the refractory lining structure of the coal injection pipe, by arranging the refractory prefabricated part, the refractory castable material can be effectively prevented from being prematurely damaged or falling off due to high-temperature ablation, chemical coking mechanical cleaning, and failure of the anchoring system, and the service life can be improved. The following is combined with Figures 1 to 4 The figure further describes the refractory lining structure of the coal injection pipe for the cement rotary kiln in this embodiment.

[0037] Specifically, if Figure 1 and Figure 2 As shown, the coal injection pipe refractory lining structure for cement rotary kiln in this embodiment can be used for the coal injection pipe, which includes a pipe body 100. The coal injection pipe refractory lining structure includes: an anti-coking baffle 200, a first anchor 300, a refractory prefabricated part 400 and a refractory castable material.

[0038] Among them, the anti-coking baffle 200 is arranged at the end of the pipe body 100, and the anti-coking baffle 200 extends outward in the radial direction of the pipe body 100; the number of first anchors 300 is multiple, and the multiple first anchors 300 are arranged in sequence and spaced along the circumferential direction of the pipe body 100 on the outer wall of the pipe body 100; the number of refractory prefabricated parts 400 is multiple, and the multiple refractory prefabricated parts 400 are connected in sequence along the circumferential direction of the pipe body 100 to form an annular structure and are sleeved on the outer periphery of the pipe body 100, and each refractory prefabricated part 400 is respectively connected to the first anchor 300 in a one-to-one correspondence; the refractory castable material is filled between the outer wall of the pipe body 100 and the refractory prefabricated part 400.

[0039] Exemplarily, the pipe body 100 is the outer shell of the coal injection pipe equipment, which can be made of high-temperature and corrosion-resistant metal pipes. The pipe body 100 can be set inside a high-temperature furnace, and the head of the pipe body 100 is closest to the flame.

[0040] Exemplarily, the anti-coking baffle 200 is fixed on the outer edge of the head of the tube body 100 by welding. The anti-coking baffle 200 is perpendicular to the axial direction of the tube body 100 and extends outward along the radial direction of the tube body 100. The middle part of the anti-coking baffle 200 has a through hole, and the opening of the head of the tube body 100 is adapted to the size of the through hole.

[0041] The anti-coking baffle 200 can reduce the amount of heat radiation from the furnace interior that enters the end portion of the refractory lining structure formed by the refractory prefabricated member 400 and the refractory castable material from the axial end face of the pipe body 100, and can also isolate the high-temperature oxidizing atmosphere from the axial end face of the pipe body 100. In addition, during masonry, the anti-coking baffle 200 can also serve as a baffle on one side when pouring the refractory castable material.

[0042] In one embodiment, the operating temperature of the coal injection pipe head is about 1400° C., and the anti-coking baffle 200 can be made of ZG35Cr20Ni80 material.

[0043] For example, the first anchor 300 can be used to secure the refractory prefabricated member 400. The first anchor 300 can be welded to the outer wall of the tubular body 100. The first anchor 300 can be a wedge-shaped seat, a clamping seat, or a snap-fit structure. Furthermore, in this embodiment, multiple refractory prefabricated members 400 are provided. To effectively secure each of the multiple refractory prefabricated members 400 to the outer circumference of the tubular body 100, multiple first anchors 300 are provided. These multiple first anchors 300 can be sequentially spaced apart along the circumference of the tubular body 100.

[0044] In one embodiment, the first anchor 300 may be made of 06Cr25Ni20 material, and the continuous use temperature of the first anchor 300 may reach 1150°C.

[0045] For example, there are multiple refractory prefabricated members 400, which can be sequentially connected end to end to form an annular structure and sleeved around the outer circumference of the pipe body 100. Each refractory prefabricated member 400 can be sealed and connected to other adjacent refractory prefabricated members 400. Moreover, in this embodiment, the multiple refractory prefabricated members 400 can be provided on the outer sides of the multiple first anchors 300 in a one-to-one correspondence, and each refractory prefabricated member 400 is fixedly connected to the pipe body 100 via the corresponding first anchor 300.

[0046] In this embodiment, the refractory preform 400 can be a preform made of silicon nitride and silicon carbide. For example, the refractory preform 400 can be made from silicon carbide and silicon through nitriding and firing. The refractory preform 400 produced in this manner has a safe operating temperature of no less than 1400°C for high-temperature oxidation resistance, and a maximum operating temperature of up to 1750°C. Furthermore, the refractory preform 400 has a high-temperature flexural strength 4-8 times that of traditional refractory materials, meeting explosion-proof requirements and exhibiting high-temperature properties such as high high-temperature flexural strength, excellent thermal shock stability, and wear resistance.

[0047] A cylindrical gap is formed between the refractory preform 400 and the outer wall of the tube body 100, into which the refractory castable material can be filled. During use, the refractory preform 400 can block harmful chemical elements from the outside, thereby effectively protecting the first anchor 300 and the refractory castable material from damage and extending their service life.

[0048] For example, the refractory castable material can be filled between the refractory prefabricated part 400 and the pipe body 100, and can form a refractory layer on the outside of the pipe body 100 to achieve effective heat insulation. Optionally, the refractory castable material is a corundum mullite refractory self-flowing castable.

[0049] In actual use, multiple refractory preforms 400 can be fixed one by one to the outer periphery of the pipe body 100 with the help of the first anchor 300, and can be formed into an annular structure. The refractory castable material can fill the gap between the annular structure formed by the refractory preform 400 and the pipe body 100, thereby forming an internal working layer on the outside of the pipe body 100, and an anti-coking baffle 200 is provided at the end of the pipe body 100, which can isolate the high-temperature oxidizing atmosphere from the end face of the pipe body 100 in the axial direction, and at the same time reduce the heat radiation transferred to the refractory lining structure.

[0050] Compared with the prior art, in the refractory lining structure of the coal injection pipe in this embodiment, the refractory preform 400 can be fixed to the outer periphery of the pipe body 100 via the first anchor 300, and the refractory castable material can be arranged between the refractory preform 400 and the outer wall of the pipe body 100. Moreover, the anti-coking baffle 200 can protect the refractory lining structure from the end face of the pipe body 100 in the axial direction, thereby isolating the oxidizing atmosphere from the end face of the pipe body while effectively avoiding premature damage and falling off of the refractory lining structure due to high-temperature ablation, mechanical cleaning of chemical coking, and failure of the anchoring system.

[0051] Further, in one embodiment, Figure 1 and Figure 2As shown, the refractory lining structure of the coal injection pipe also includes a second anchor 500. There are multiple second anchors 500, and the multiple second anchors 500 are arranged in sequence and spaced apart on the outer wall of the pipe body 100 along the circumferential direction of the pipe body 100. The second anchor 500 is located on the inner side of the refractory prefabricated part 400.

[0052] For example, the second anchor 500 can be used to improve the fixing effect of the refractory castable material relative to the pipe body 100. Specifically, the second anchor 500 is fixed to the outer wall of the pipe body 100 by welding. After the refractory castable material fills the gap between the annular structure formed by the refractory prefabricated part 400 and the outer wall of the pipe body 100, the second anchor 500 can be embedded in the refractory castable material. It can effectively fix the refractory castable material after the refractory castable material is hardened and sintered, preventing the refractory castable material from loosening from the outer wall of the pipe body 100.

[0053] Furthermore, in one embodiment, the second anchor 500 is a seagull-shaped anchor, and the second anchor 500 is fixedly arranged on the outer wall of the tube body 100 at an angle to the axial direction of the tube body 100, and the second anchor 500 and the first anchor 300 are arranged in sequence at intervals in the circumferential direction of the tube body 100.

[0054] Exemplarily, the second anchor 500 is a seagull-shaped anchor. The second anchor 500 can be roughly constructed as a V-shaped bracket, which includes a first fixing rod and a second fixing rod. The first fixing rod and the second fixing rod are connected to each other and are roughly V-shaped. The position where the first fixing rod and the second fixing rod are connected to each other can be fixed on the outer wall of the tube body 100 by welding. The ends of the first fixing rod and the second fixing rod away from each other are respectively provided with a first transverse section and a second transverse section. The first transverse section and the second transverse section are respectively provided with plastic caps, and the thickness of the plastic caps can be 2 mm.

[0055] Moreover, in order to improve the fixing effect, the plane where the second anchor 500 is located is inclined to the axial direction of the tube body 100. For example, the second anchor 500 can be welded to the outer wall of the tube body 100 at an angle of 45° relative to the axial direction of the tube body 100.

[0056] During masonry, after the refractory castable material fills the gap between the annular structure formed by the refractory prefabricated member 400 and the outer wall of the tube body 100, the second anchor 500 can be embedded into the refractory castable material. Moreover, after the refractory castable material hardens and sinters, the refractory castable material and the second anchor 500 can form a whole. Thus, while forming the second refractory layer, the refractory lining structure can be structurally interlocked, providing multi-layer protection and effectively ensuring the safety of the refractory lining structure.

[0057] In one embodiment, the second anchor 500 may be made of 06Cr25Ni20 material, and the continuous use temperature of the second anchor 500 may reach 1150°C.

[0058] Moreover, in order to improve the fixing effect, the second anchor 500 is arranged between two adjacent first anchors 300, that is, the first anchor 300 and the second anchor 500 are sequentially spaced along the circumferential direction of the tube body 100, and a plurality of second anchors 500 can be arranged between two adjacent first anchors 300. For example, Figure 1 As shown, in one embodiment, two adjacent first anchors 300 are provided with two second anchors 500 , and the two anchors are spaced apart along the axial direction of the tubular body 100 .

[0059] Further, in one embodiment, Figure 3 As shown, the refractory preform 400 includes: a main body 410 and a clamping portion 420. The clamping portion 420 is arranged on the inner wall of the main body 410 facing the pipe body 100. The clamping portion 420 is connected to the first anchor 300. The main bodies 410 of adjacent refractory preforms 400 are sequentially connected to each other along the circumferential direction of the pipe body 100.

[0060] Exemplarily, each refractory preformed part 400 may include a main body 410 and a clamping portion 420, wherein the main body 410 of each refractory preformed part 400 can be connected to each other in sequence and can form an annular structure on the periphery of the pipe body 100, and the refractory castable material can be filled between the main body 410 and the outer wall of the pipe body 100.

[0061] In one embodiment, the body 410 is constructed as a plate-like structure with a certain curvature, and both ends of the body 410 of each refractory prefabricated component 400 in the curvature direction can be sealed with the body 410 of the adjacent refractory prefabricated component 400 .

[0062] The body 410 has an inner wall on the side facing the tubular body 100, on which the engaging portion 420 is disposed. Furthermore, the engaging portion 420 can be connected to the first anchor 300. Optionally, the body 410 and the engaging portion 420 can be integrally formed. Furthermore, to ensure that a continuous space is formed when multiple bodies 410 are connected, the inner wall of the body 410 is configured as a curved surface that matches the outer wall of the tubular body 100.

[0063] In one embodiment, the length of the body 410 in the axial direction of the pipe body 100 is 150 to 200 mm, and the thickness of the body 410 in the radial direction of the pipe body 100 is 40 to 60 mm.

[0064] In order to achieve an effective connection, in one embodiment, Figure 4As shown, the first anchor 300 includes a support plate 310 , a first extension plate 320 and a second extension plate 330 .

[0065] Among them, the support plate 310 is fixedly connected to the outer wall of the tube body 100, the first extension plate 320 and the second extension plate 330 are respectively connected to the opposite sides of the support plate 310, and the side of the first extension plate 320 away from the support plate 310 and the side of the second extension plate 330 away from the support plate 310 extend outward along the radial direction of the tube body 100 and approach each other.

[0066] The clamping portion 420 has a first abutting surface 421 and a second abutting surface 422 in the circumferential direction of the tube body 100 . The first abutting surface 421 and the second abutting surface 422 extend inwardly and away from each other along the radial direction of the tube body 100 away from the side of the body 410 .

[0067] The clamping portion 420 is clamped between the first extension plate 320 and the second extension plate 330 . The first abutting surface 421 can abut against the first extension plate 320 , and the second abutting surface 422 can abut against the second extension plate 330 .

[0068] For example, the first anchor 300 can be formed by sequentially connecting a first extension plate 320, a support plate 310, and a second extension plate 330. The first extension plate 320 and the second extension plate 330 are bent toward the same side relative to the support plate 310. The side of the first extension plate 320 away from the support plate 310 and the side of the second extension plate 330 away from the support plate 310 gradually approach each other. An opening is formed between the side of the first extension plate 320 away from the support plate 310 and the side of the second extension plate 330 away from the support plate 310. In this case, the first anchor 300 can be formed with a wedge-shaped receiving groove.

[0069] During actual installation, the support plate 310 can be fixed to the outer wall of the tube body 100 by welding. For example, a natural slope can be set on the outer edge of the support plate 310 to facilitate welding, and then the outer edge of the support plate 310 and the outer wall of the tube body 100 can be welded together using a welding rod. In addition, to improve the stability of the welding, a welding hole is provided in the middle of the support plate 310. In this case, in addition to welding along the outer edge of the support plate 310, the inner wall edge of the welding hole can also be welded to the outer wall of the tube body 100. In this way, the effective welding area can be increased, thereby improving safety.

[0070] In one embodiment, the length of the first anchor 300 in the axial direction of the tubular body 100 is 50% to 100% of the length of the clamping portion 420. For example, the length of the first anchor 300 in the axial direction of the tubular body 100 is two-thirds of the length of the clamping portion 420. The thickness of the first extension plate 320, the support plate 310, and the second extension plate 330 is 3 to 6 mm, and the angle between the first extension plate 320 and the second extension plate 330 is 60° to 75°.

[0071] Accordingly, in order to enable the clamping portion 420 to be clamped into the wedge-shaped receiving groove formed by the first anchor 300, the clamping portion 420 can also be constructed in a wedge shape, for example, Figure 3 As shown, the clamping portion 420 has a first abutting surface 421 and a second abutting surface 422 on opposite sides, and the first abutting surface 421 and the second abutting surface 422 gradually move away from the side of the body 410. At this time, the clamping portion 420 is roughly formed into a wedge-shaped block.

[0072] In one embodiment, the height of the clamping portion 420 in the radial direction of the tube body 100 can be 40 to 60 mm, and the length of the clamping portion 420 in the axial direction of the tube body 100 can be 30% to 100% of the length of the main body 410. In addition, to ensure a compatible installation, the angle between the first abutting surface 421 and the second abutting surface 422 is 60° to 75°.

[0073] When installing the refractory prefabricated member 400, the first abutting surfaces 421 and the second abutting surfaces 422 are spaced apart in the circumferential direction of the tubular body 100, allowing the first clamping portion 420 to move in the radial direction of the tubular body 100, sliding into the wedge-shaped receiving groove formed by the first anchor 300 through the opening formed between the side of the first extension plate 320 away from the support plate 310 and the side of the second extension plate 330 away from the support plate 310. At this time, the first extension plate 320 and the second extension plate 330 can clamp the clamping portion 420 from both sides, with the first abutting surface 421 abutting the first extension plate 320 and the second abutting surface 422 abutting the second extension plate 330. Furthermore, due to the clamping action of the first extension plate 320 and the second extension plate 330, the clamping portion 420 cannot move radially away from the tubular body 100, effectively securing the refractory prefabricated member 400 to the outer circumference of the tubular body 100.

[0074] In one embodiment, in order to reduce the heat transfer from the refractory prefabricated member 400 to the pipe body 100 and further improve the thermal insulation effect, Figure 2 As shown, the refractory lining structure of the coal injection pipe further includes a nano-insulation plate 600 , and an insulation gap is provided between the clamping portion 420 and the support plate 310 , and the nano-insulation plate 600 is disposed in the insulation gap.

[0075] For example, the nano-insulation plate 600 is a highly efficient thermal insulation material manufactured using nanotechnology. It is resistant to high temperatures and exhibits excellent thermal insulation properties. The clamping portion 420 has a mounting surface 423 on the side facing the tube body 100. A first abutting surface 421 and a second abutting surface 422 are located on either side of the mounting surface 423. When the clamping portion 420 is clamped into the wedge-shaped receiving groove formed by the first anchor 300, the mounting surface 423 faces the support plate 310, and an insulating gap is formed between the mounting surface 423 and the support plate 310. The nano-insulation plate 600 is disposed in this insulating gap.

[0076] It can be understood that by setting the nano-insulation board 600, the heat transfer from the refractory prefabricated part 400 to the pipe body 100 can be reduced. Under the same external wind flux of the coal injection pipe, the operating temperature and heat load of the coal injection pipe head shell and the first anchor 300 will be effectively reduced, making them far lower than the secondary air temperature, keeping them below the safety temperature line and operating at the lowest heat load, thereby ensuring the mechanical properties of the anchoring system.

[0077] In one embodiment, during manufacturing, a heat insulation gap of 5 to 20 mm may be reserved between the support plate 310 and the clamping portion 420 .

[0078] Further, in one embodiment, Figure 1 As shown, the main body 410 is provided with a protrusion 430 and a groove 440 on both sides of the circumferential direction of the tube body 100, respectively. The shape of the protrusion 430 and the shape of the groove 440 match each other. The protrusion 430 on the main body 410 of the refractory preform 400 is clamped into the groove 440 on the main body 410 of another adjacent refractory preform 400 in the circumferential direction of the tube body 100.

[0079] Exemplarily, the protrusion 430 can be constructed as a protrusion structure arranged on one side of the arc direction of the main body 410, and the groove portion 440 can be constructed as a groove structure arranged on the other side of the arc direction of the main body 410 relative to the protrusion 430, and the shape of the protrusion 430 matches the groove formed by the groove portion 440.

[0080] During actual installation, the protrusion 430 on the main body 410 of one refractory preformed part 400 can be snapped into the groove 440 on the main body 410 of another adjacent refractory preformed part 400. Through the installation method of snapping the protrusion 430 into the groove 440, multiple refractory preformed parts 400 can be connected in sequence in the circumferential direction of the pipe body 100, and finally form an annular structure on the outer periphery of the pipe body 100.

[0081] Further, in one embodiment, Figure 1As shown, the anti-coking baffle 200 has an expansion gap extending along the radial direction of the tube body 100 .

[0082] For example, the anti-coking baffle 200 is arranged at the end of the tube body 100. As a consumable part, it needs to withstand the high temperature inside the furnace. The anti-coking baffle 200 will expand under high temperature. In order to improve the service life of the anti-coking baffle 200, multiple expansion gaps can be set on the anti-coking baffle 200 to cope with the expansion of the anti-coking baffle 200 itself.

[0083] In one embodiment, Figure 1 As shown, the anti-coking baffle 200 is constructed as a circular ring structure, and is provided with a plurality of expansion gaps running through the anti-coking baffle 200 along its radial direction. The plurality of expansion gaps separate the anti-coking baffle 200 into a plurality of baffles arranged at intervals along the circumferential direction of the tube body 100.

[0084] For example, in one embodiment, four to six expansion gaps are provided on the anti-coking baffle 200 , and the width of each expansion gap may be 5 to 8 mm.

[0085] Optionally, the anti-coking baffle 200 may have a thickness of 8-12 mm.

[0086] Moreover, in this embodiment, the refractory preforms 400 are arranged adjacent to each other in the axial direction of the tube body 100, and the multiple refractory preforms 400 form at least three rows of adjacent annular structures in the axial direction of the tube body 100. The total length of the at least three rows of adjacent annular structures formed by the multiple refractory preforms 400 in the axial direction of the tube body 100 is not less than 500 mm.

[0087] For example, Figure 1 As shown, the multiple refractory preforms 400 can be formed into three adjacent rows of annular structures in the axial direction of the pipe body 100. The inner sides of the three rows of annular structures can be simultaneously filled with refractory castable material. Moreover, each row of annular structures has a length of 200 mm in the axial direction of the pipe body 100. In this case, the multiple refractory preforms 400 can form an annular structure with a total length of 600 mm around the outer circumference of the pipe body 100.

[0088] Furthermore, in this embodiment, a masonry method is also provided, which includes:

[0089] Welding the anti-coking baffle 200 to the end of the pipe body 100;

[0090] According to the calculation and measurement results, the installation position of the first anchor 300 is marked on the outer wall of the pipe body 100, and the first anchor 300 is welded and fixed to the outer wall of the pipe body 100 in sequence according to the installation position;

[0091] A second anchor 500 is welded and fixed at a middle position between two adjacent first anchors 300 , and the second anchor 500 is tilted relative to the axial direction of the tube body 100 ;

[0092] Use the first anchor 300 to fix the first refractory prefabricated member 400 to the outer periphery of the pipe body 100, and use the remaining first anchors 300 to fix the refractory prefabricated members 400 to the outer periphery of the pipe body 100 in a left-right alternating manner, leaving the last two refractory prefabricated members 400 as pouring holes;

[0093] Installing the nano thermal insulation board 600 into the thermal insulation gap between the refractory preform 400 and the first anchor 300;

[0094] Filling the refractory insulation material into the gap between the refractory prefabricated part 400 and the pipe body 100 through the pouring hole;

[0095] After the refractory castable material is filled, the remaining two refractory prefabricated members 400 are installed.

[0096] For example, in the masonry method of this embodiment:

[0097] First, the anti-coking baffle 200 can be fixed to the end of the pipe body 100 by welding. Then, the number of refractory prefabricated parts 400 required and the installation position of each first anchor 300 on the outer wall of the pipe body 100 can be calculated according to the size of the refractory prefabricated parts 400 and the diameter of the pipe body 100, and these installation positions can be marked on the outer wall of the pipe body 100.

[0098] Next, all first anchors 300 are fixed to the outer wall of the pipe body 100 by welding based on the installation position. Then, a second anchor 500 is welded at the center position between two adjacent first anchors 300 in the circumferential direction of the pipe body 100. Moreover, the second anchor 500 needs to be inclined with respect to the axial direction of the pipe body 100.

[0099] After the first anchor 300 and the second anchor 500 are both fixed to the outer wall of the pipe body 100, the first refractory prefabricated member 400 is moved along the axial direction of the pipe body 100 and fixed to the outer periphery of the pipe body 100 by using the first anchor 300. Then, the remaining refractory prefabricated members 400 are alternately fixed to the outer wall of the pipe body 100 from the left and right sides of the first refractory prefabricated member 400. For example, the second and third refractory prefabricated members 400 can be fixed to the sides of the first refractory prefabricated member 400 by using the first anchor 300, respectively. The fourth and fifth refractory prefabricated members 400 can be fixed to the sides of the second and third refractory prefabricated members 400 away from the first refractory prefabricated member 400 by using the first anchor 300, respectively. When only two refractory prefabricated members 400 are left, the installation can be stopped. The installation area where the last two refractory prefabricated members 400 are located can be formed into a pouring hole for filling the refractory castable material.

[0100] During the installation of the refractory prefabricated member 400 , if a slight installation error occurs, the installation position of the refractory prefabricated member 400 can be adjusted by prying the first extension plate 320 and the second extension plate 330 of the first anchor 300 .

[0101] Moreover, in some embodiments, when the outer periphery of the pipe body 100 needs to be provided with a ring structure formed by multiple rows of refractory preformed parts 400 along its axial direction, the same installation method can be adopted to install each row of refractory preformed parts 400, and the refractory preformed parts 400 in the same position can be reserved at the same time.

[0102] At the same time, in order to prevent the refractory castable material from flowing out, a temporary baffle can be set on the side of the refractory prefabricated part 400 away from the anti-coking baffle 200, and the temporary baffle and the anti-coking baffle 200 are used to block the refractory castable material on both sides of the axial direction of the tube body 100.

[0103] After the refractory preform 400 is installed, the refractory castable material is filled into the gap between the refractory preform 400 and the tube body 100 using the casting hole. Moreover, the height of the refractory castable material in the casting hole needs to be greater than the installation height of the refractory preform 400 to ensure that the refractory castable material is fully filled in the gap.

[0104] Finally, the remaining refractory preforms 400 are sequentially installed along the axial direction of the tube body 100 . During the installation process, excess refractory casting material can be squeezed out, and the last installed refractory preform 400 can seal the casting hole.

[0105] This completes the installation.

[0106] The refractory lining structure of the coal injection pipe in this embodiment has the following advantages:

[0107] (1) The refractory lining material structure is reasonably designed and highly operable, which can realize the modular installation of high-performance prefabricated parts of coal injection pipes, effectively avoiding the problem of difficult quality control of traditional refractory castables, and at the same time, saving the cost of making molds on the construction site;

[0108] (2) The anchoring structure can achieve the purpose of increasing the insulation layer and reducing the heat load, which is safer than the traditional single V-shaped anchoring solution;

[0109] (3) The refractory lining structure can achieve sealing interlocking and multi-layer protection functions, which is safe and reliable;

[0110] (4) This solution can adapt to the current working conditions of cement kilns and solve the problem of short life of traditional refractory castable lining structures, thereby significantly reducing economic losses, effectively improving the safe operation cycle of cement kiln coal injection pipe equipment, and solving the problem of the barrel effect of the refractory system.

[0111] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one location or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of the present embodiment. Persons of ordinary skill in the art will be able to understand and implement the present invention without inventive effort.

[0112] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A refractory lining structure for a coal injection pipe of a cement rotary kiln, characterized in that: The coal injection pipe refractory lining structure is used for the coal injection pipe, and the coal injection pipe includes a pipe body. The coal injection pipe refractory lining structure includes: an anti-coking baffle, the anti-coking baffle being arranged at an end of the tube body and extending outwardly in a radial direction of the tube body; a first anchoring piece, wherein the number of the first anchoring pieces is plural and the first anchoring pieces are sequentially spaced apart and arranged on the outer wall of the tube body along the circumferential direction of the tube body; A plurality of refractory prefabricated parts are connected in sequence along the circumferential direction of the tube body to form an annular structure and are sleeved on the outer circumference of the tube body. The refractory prefabricated parts abut against the anti-coking baffle, and each of the refractory prefabricated parts is connected to the first anchor piece in a one-to-one correspondence; Refractory castable material is filled between the outer wall of the tube body and the refractory prefabricated part.

2. The refractory lining structure of the coal injection pipe for cement rotary kiln according to claim 1, characterized in that: It also includes a second anchor, which is in multiple numbers and is sequentially spaced along the circumferential direction of the tube body on the outer wall of the tube body. The second anchor is located on the inner side of the refractory prefabricated component.

3. The refractory lining structure of the coal injection pipe for cement rotary kiln according to claim 2, characterized in that: The second anchor is a seagull-shaped anchor, and the second anchor is fixedly arranged on the outer wall of the tube body at an angle relative to the axial direction of the tube body.

4. The refractory lining structure of the coal injection pipe for a cement rotary kiln according to claim 2, characterized in that: The second anchoring piece and the first anchoring piece are sequentially spaced apart in the circumferential direction of the tube body.

5. The refractory lining structure of the coal injection pipe for cement rotary kiln according to claim 1, characterized in that: The refractory prefabricated component includes a body and a clamping portion, wherein the clamping portion is arranged on the inner wall of the body facing the tube body and connected to the first anchoring piece. The bodies of adjacent refractory prefabricated components are sequentially connected to each other along the circumferential direction of the tube body.

6. The refractory lining structure of the coal injection pipe for a cement rotary kiln according to claim 5, characterized in that: The first anchoring member includes: a support plate, a first extension plate and a second extension plate, The support plate is fixedly connected to the outer wall of the tube body, the first extension plate and the second extension plate are respectively connected to opposite sides of the support plate, and the side of the first extension plate away from the support plate and the side of the second extension plate away from the support plate extend outwardly along the radial direction of the tube body and approach each other; The clamping portion has a first abutting surface and a second abutting surface in the circumferential direction of the tube body, wherein a side of the first abutting surface away from the body and a side of the second abutting surface away from the body extend inwardly along the radial direction of the tube body and are away from each other; The clamping portion is clamped between the first extension plate and the second extension plate, the first abutting surface abuts against the first extension plate, and the second abutting surface abuts against the second extension plate.

7. The refractory lining structure of the coal injection pipe for a cement rotary kiln according to claim 6, characterized in that: It also includes a nano thermal insulation plate, a thermal insulation gap is provided between the clamping portion and the support plate, and the nano thermal insulation plate is arranged in the thermal insulation gap.

8. The refractory lining structure of the coal injection pipe for a cement rotary kiln according to claim 5, characterized in that: The main body is respectively provided with a protrusion and a groove on both sides of the circumferential direction of the tube body, and the shape of the protrusion matches the shape of the groove. The protrusion on the main body of the refractory preform is clamped into the groove on the main body of another adjacent refractory preform in the circumferential direction of the tube body.

9. The refractory lining structure of the coal injection pipe for a cement rotary kiln according to claim 1, characterized in that: The anti-coking baffle has an expansion gap extending in the radial direction of the tube body.

10. The refractory lining structure of the coal injection pipe for cement rotary kiln according to claim 1, characterized in that: The refractory preforms are arranged adjacent to each other in sequence in the axial direction of the tube body, and multiple refractory preforms form at least three rows of adjacent annular structures in the axial direction of the tube body. The total length of the at least three rows of adjacent annular structures formed by multiple refractory preforms in the axial direction of the tube body is not less than 500 mm.

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