A light manhole device suitable for high temperature combustion chamber

Abstract

This invention discloses a lightweight manhole device suitable for high-temperature combustion chambers, belonging to the technical field of combustion chamber maintenance devices. The high-temperature combustion chamber wall includes a refractory layer, an intermediate layer, and an outer layer arranged from the inside out. The manhole device penetrates the outer and intermediate layers and connects to the refractory layer. The manhole device includes a pipe ring assembly, a baffle plate, and a manhole cover. The pipe ring assembly includes a first pipe ring, a second pipe ring, and multiple hollow air ducts. The first pipe ring has a first cavity inside, the second pipe ring has a second cavity inside, and the air ducts have a third cavity inside. The first cavity communicates with the second cavity through the third cavity. An air inlet and an air outlet are connected to the pipe ring assembly. The airflow entering through the air inlet exchanges heat with the pipe ring assembly in the three cavities and is then discharged through the air outlet. The air-cooled pipe ring assembly of the manhole device of this invention has forced cooling ventilation, which reduces the material selection threshold and manufacturing cost; the heat conduction through the steel is also greatly reduced, which can effectively reduce the surface temperature of the manhole device.

Description

Technical Field

[0001] This invention belongs to the technical field of combustion chamber maintenance devices, specifically relating to a lightweight manhole device suitable for high-temperature combustion chambers. Background Technology

[0002] The combustion chamber of the combustion equipment is constantly exposed to high temperatures (above 1000℃), requiring periodic shutdowns for maintenance. Therefore, a high-temperature maintenance manhole device must be installed. This device must be able to withstand long-term high-temperature operating conditions and possess excellent thermal insulation performance.

[0003] Currently, most common manhole devices are made of heat-resistant steel to ensure performance in high-temperature environments, with the inner side filled with heat-insulating and fire-resistant concrete. The entire inspection device is quite bulky and cannot achieve excellent heat insulation on the entire surface of the door cover. Only the high-temperature heat loss at the door cover accumulates more, which is not conducive to energy saving.

[0004] Therefore, the development of a lightweight manhole device suitable for high-temperature combustion chambers that is made of common materials, resistant to high temperatures, has a long service life, excellent thermal insulation, and is lightweight not only has economic benefits but also certain social benefits. Summary of the Invention

[0005] Technical Problem: In view of the above-mentioned problems existing in the prior art, the technical problem to be solved by the present invention is to provide a lightweight manhole device suitable for high-temperature combustion chambers to solve the problems of high surface temperature, large heat loss, easy high-temperature carbonization of cylinder material after long-term use, and bulky overall device of the current manhole device.

[0006] Technical Solution: To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A lightweight manhole device suitable for high-temperature combustion chambers is disclosed. The high-temperature combustion chamber wall includes a refractory layer, an intermediate layer, and an outer layer arranged from the inside to the outside. The manhole device penetrates the outer layer and the intermediate layer and is connected to the refractory layer. The manhole device includes a pipe ring assembly for forming a manhole passage, a fire baffle for sealing the inner side of the manhole passage, and a manhole cover for sealing the outer side of the manhole passage. The pipe ring assembly includes a first pipe ring, a second pipe ring, and a plurality of hollow air ducts connecting the first pipe ring and the second pipe ring. The first pipe ring has a first cavity inside, the second pipe ring has a second cavity inside, and the air ducts have a third cavity inside. The first cavity communicates with the second cavity through the third cavity. An air inlet and an air outlet are connected to the pipe ring assembly. The airflow entering through the air inlet exchanges heat with the pipe ring assembly in the three cavities and is then discharged from the air outlet.

[0008] Preferably, the tube ring assembly is fitted with a cylindrical body.

[0009] Preferably, the cylindrical body is provided with multiple hollow holes.

[0010] Preferably, the outer side of the cylinder is provided with a heat insulation layer.

[0011] Preferably, the air inlet is located at one end of the second pipe ring, and the air outlet is located at the other end of the second pipe ring.

[0012] Preferably, the second cavity is provided with a sealing plate that blocks the passage from the air inlet to the air outlet. The airflow entering the air inlet enters the first cavity from the second cavity and then exits from the second cavity.

[0013] Preferably, the refractory layer is provided with a refractory brick ring, the refractory brick ring is provided with a first annular groove corresponding to the fire baffle, and a sealing surface is formed between the fire baffle and the first annular groove.

[0014] Preferably, the refractory brick ring is provided with a second annular groove corresponding to the first tube ring.

[0015] Preferably, there is a gap between the fire baffle and the inner wall of the pipe ring assembly.

[0016] Preferably, the manhole cover is connected to the outer layer, and the manhole cover includes a cover plate.

[0017] Beneficial effects: Compared with the prior art, the present invention has the following advantages:

[0018] 1. The air-cooled pipe ring assembly of the manhole device consists of two pipe rings, upper and lower, and is supported and fixed by multiple air ducts. Due to the heat radiation from the high-temperature side of the combustion chamber, heat is conducted to the low-temperature surface of the manhole device through the metal material. Since the temperature conduction inside the metal material is not affected by the internal insulation material of the device, the temperature of the part of the device that is in contact with the metal of the cylinder is still relatively high. However, the air-cooled pipe ring assembly of the manhole device of this invention has forced cooling ventilation inside, which can directly remove the heat from the metal surface, greatly reduce the metal surface temperature, and block the metal heat conduction, thereby directly reducing the surface temperature of the manhole device and reducing surface heat loss. The reduction in metal temperature also greatly improves the service life of the material and lowers the material selection threshold. All the metal materials of the entire device can be made of carbon steel, resulting in low manufacturing cost.

[0019] 2. The outer side of the pipe ring assembly is wrapped with a cylinder, which is made of rolled steel mesh. Compared with conventional steel plate cylinders, the weight and surface area are greatly reduced, and the heat conduction through the steel is also greatly reduced, which can effectively reduce the surface temperature of the manhole device.

[0020] 3. The outer insulation layer of the cylinder provides insulation for the cylinder. The insulation layer is made of aluminum silicate insulation blanket and is used as the insulation and sealing material. The material is conventional and universal, lightweight, and easy to install and replace.

[0021] 4. The high-temperature side of this lightweight manhole device is equipped with a matching refractory brick ring and a fire baffle. The refractory brick ring is integrally cast using high-temperature resistant high-alumina concrete, and the fire baffle is made of zirconium-containing ceramic fiber, which is lightweight, high-temperature resistant, and easy to assemble and disassemble. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention;

[0023] Figure 2 This is a schematic diagram of a rectangular tube ring assembly structure;

[0024] Figure 3 This is a schematic diagram of the refractory brick ring cross-section structure;

[0025] Figure 4 yes Figure 1 Enlarged view of point A in the middle;

[0026] Figure 5 This is a schematic diagram of the cylinder in its unfolded state. Detailed Implementation

[0027] The present invention will be further illustrated below with reference to specific embodiments. These embodiments are implemented based on the technical solutions of the present invention, and it should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0028] like Figure 1 , Figure 3 and Figure 4As shown, a lightweight manhole device suitable for high-temperature combustion chambers is disclosed. The high-temperature combustion chamber wall includes a refractory layer 1, an intermediate layer 2, and an outer layer 3 arranged from the inside out. The refractory layer 1 is generally made of high-temperature resistant high-alumina refractory concrete, the intermediate layer 2 is made of perlite insulating concrete, and the outer layer 3 is made of rolled carbon steel plate. The manhole device penetrates the outer layer 3 and the intermediate layer 2 and connects to the refractory layer 1. The manhole device includes a refractory brick ring 11, a fire baffle 5, a pipe ring assembly 4, and a manhole cover 6 arranged from the inside out. The refractory brick ring 11 is integrally cast in a ring shape using high-temperature high-alumina concrete and is installed through the refractory layer 1. The pipe ring assembly 4 forms a manhole passage 9 in the middle, which is used for personnel access. The fire baffle 5 is made of zirconium-containing ceramic fiber machined board, which is lightweight and high-strength. The outer side of the refractory brick ring 11 has a first annular groove 111 corresponding to the fire baffle 5. In use, the fire baffle 5 is tightly attached to the first annular groove 111 to form a seal to block the inner side of the manhole passage 9, allowing the manhole to pass through. Manhole 9 is separated from the combustion chamber. Since the fire baffle 5 is made of zirconium-containing ceramic fiber machined board, it has good heat insulation effect. The outer diameter of the fire baffle 5 is smaller than the inner diameter of the pipe ring assembly 4, so there is a gap between the fire baffle 5 and the inner wall of the pipe ring assembly 4. For maintenance, the fire baffle 5 can be directly removed from the manhole passage 9, which is convenient and simple. The manhole cover 6 is used to cover the outside of the manhole passage 9. The manhole cover 6 includes a cover plate 61 and a cover body 62. The cover body 62 is welded to the steel plate of the outer layer 3. The cover plate 61 and the cover body 62 are connected by bolts. A matching customized asbestos rubber gasket is used between the cover plate 61 and the cover body 62 to increase the sealing performance of the flange sealing surface. The cover plate 61 is lightweight and easy to disassemble.

[0029] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, the pipe ring assembly 4 includes a first pipe ring 41, a second pipe ring 42, and multiple hollow air ducts 43 connecting the first pipe ring 41 and the second pipe ring 42. The first pipe ring 41 and the second pipe ring 42 are both made of rectangular hollow steel pipes wound together. The air ducts 43 are hollow rectangular steel pipes. The two pipe rings are connected to form a cylindrical shape. A manhole passage 9 for personnel to enter and exit is formed in the middle of the cylindrical pipe ring assembly 4. The first pipe ring 41 is located on the inner side. The refractory brick ring 11 is provided with a second ring groove 112 corresponding to the first pipe ring 41. The first pipe ring 41 is tightly attached to the second ring groove 112 and the two are sealed with refractory mortar. The first pipe ring 41 has a first cavity, the second pipe ring 42 has a second cavity, and the air duct 43 has a third cavity. The first cavity is connected to the second cavity through the third cavity. One end of the second pipe ring 42 is provided with an air inlet 71, and the other end away from the air inlet 71 is provided with an air outlet 72. The airflow entering through the air inlet 71 exchanges heat with the pipe ring assembly 4 in the three cavities and is then discharged through the air outlet 72. The incoming airflow can utilize the cold air from the combustion blower outlet, requiring no additional air source, and is supplied synchronously with combustion. The second cavity is provided with a sealing plate 421 to block the passage from the air inlet 71 to the air outlet 72. Two sealing plates 421 are provided, one located at the upper end of the second pipe ring 42, and the other... Located at the lower end of the second tube ring 42, the annular second cavity is divided into two semi-circular cavities. Under the action of the two sealing plates 421, the airflow entering through the air inlet 71 cannot directly reach the air outlet 72 within the annular second cavity. The airflow entering through the air inlet 71 enters the first cavity through multiple third cavities connected to the left semi-circular cavity, and then returns to the second cavity for discharge through multiple third cavities connected to the right semi-circular cavity. The air-cooling channel is extended, resulting in good heat exchange effect. Due to the air-cooling effect, the metal surface temperature of the entire rectangular tube ring assembly remains low even in high-temperature environments, and the metal strength does not decrease significantly. The entire rectangular tube ring assembly has high strength, and there is no risk of surface high-temperature carbonization during long-term use.

[0030] like Figure 1 , Figure 4 and Figure 5 As shown, the tube ring assembly 4 is surrounded by a cylindrical body 8, which has multiple perforated holes 81. The cylindrical body 8 is made of rolled steel mesh. The cylindrical body 8 can enhance the structural strength of the tube ring assembly 4. While strengthening the overall strength of the tube ring assembly 4, it also facilitates external insulation work and adds a heat insulation layer 82. Moreover, since the circumferential cross-sectional area of ​​the cylindrical body 8 made of steel mesh is much smaller than that of a conventional cylindrical body made of a single piece of steel plate, the heat conduction between the metals is also greatly reduced. The outer side of the cylindrical body 8 is also provided with a heat insulation layer 82, which is made of rolled aluminum silicate fiber insulation blanket. The aluminum silicate fiber insulation blanket serves as a filling material for insulation and sealing outside the cylindrical body 8. The material is conventional and widely available, lightweight, and easy to install and replace.

[0031] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A lightweight manhole device suitable for a high-temperature combustion chamber, wherein the wall of the high-temperature combustion chamber comprises a refractory layer (1), an intermediate layer (2), and an outer layer (3) arranged from the inside to the outside, characterized in that, The manhole device penetrates the outer layer (3) and the intermediate layer (2) and is connected to the fire-resistant layer (1). The manhole device includes a pipe ring assembly (4) for forming a manhole passage (9), a fire baffle (5) for sealing the inner side of the manhole passage (9), and a manhole cover (6) for sealing the outer side of the manhole passage (9). The pipe ring assembly (4) includes a first pipe ring (41), a second pipe ring (42), and a plurality of hollow air ducts (43) connecting the first pipe ring (41) and the second pipe ring (42). The first pipe ring (41) has a first cavity inside, and the second pipe ring (42) has a second cavity inside. The air ducts (43) 3) The first cavity is connected to the second cavity through the third cavity. The pipe ring assembly (4) is connected to an air inlet (71) and an air outlet (72). The airflow entering through the air inlet (71) exchanges heat with the pipe ring assembly (4) in the three cavities and is discharged from the air outlet (72). The pipe ring assembly (4) is covered with a cylinder (8). The cylinder (8) is provided with multiple hollow holes (81). The outer side of the cylinder (8) is provided with a heat insulation layer (82). The air inlet (71) is located at one end of the second pipe ring (42), and the air outlet (72) is located at the other end of the second pipe ring (42). The second cavity is provided with a sealing plate (421) to block the passage from the air inlet (71) to the air outlet (72). The airflow entering the air inlet (71) enters the first cavity from the second cavity and then exits from the second cavity. The refractory layer (1) is provided with a refractory brick ring (11). The refractory brick ring (11) is provided with a first ring groove (111) corresponding to the fire baffle (5). A sealing surface is formed between the fire baffle (5) and the first ring groove (111). The refractory brick ring (11) is provided with a second ring groove (112) corresponding to the first pipe ring (41).

2. The lightweight manhole device suitable for high-temperature combustion chambers according to claim 1, characterized in that, There is a gap between the fire baffle (5) and the inner wall of the pipe ring assembly (4).

3. The lightweight manhole device suitable for high-temperature combustion chambers according to claim 1, characterized in that, The manhole cover (6) is connected to the outer layer (3), and the manhole cover (6) includes a cover plate (61).

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