Organic heat carrier gas heating furnace outer insulation flue gas sealing structure

Abstract

The utility model discloses an organic heat carrier gas heating furnace outer thermal insulation flue gas sealing structure, including the casing, furnace top cover, furnace bottom plate, combustor and inner ring furnace pipe and outer ring furnace pipe, still include first sealing board, first supporting board ring, second supporting board ring, casing flange and second sealing board, first supporting board ring inner wall surface and casing top surface full -welding sealing fixed connection, casing flange outer wall surface and furnace top cover bottom surface full -welding sealing fixed connection, second sealing board top surface and casing flange inner wall surface full -welding sealing fixed connection, second sealing board lower part and first supporting board ring top surface full -welding sealing fixed connection, first sealing board lower part is covered on the outer ring furnace pipe upper portion outside pipe wall and with outer ring furnace pipe full -welding sealing fixed connection, second supporting board ring outer wall surface and first supporting board ring top surface full -welding sealing fixed connection, second supporting board ring inside bottom surface and first sealing board outer wall surface full -welding sealing fixed connection. The utility model avoids the outer thermal insulation layer to leak smoke, and the sealing performance is better, and the safety performance is high.

Description

Technical Field

[0001] This utility model relates to an organic heat carrier gas-fired heating furnace for industrial heat exchange, and in particular to an external insulation flue gas sealing structure for an organic heat carrier gas-fired heating furnace, belonging to the field of industrial boiler technology. Background Technology

[0002] An existing organic heat carrier gas-fired heater includes a cylindrical shell, a furnace top cover installed on the top of the shell, a furnace bottom plate installed at the bottom of the shell, a burner, and vertical spiral inner and outer ring furnace tubes spaced apart inside the shell cavity. A through hole is opened in the middle of the furnace bottom plate, the burner is installed below the furnace bottom plate, and the burner head passes through the through hole and is placed inside the shell cavity. A flue for exhausting flue gas is opened on the lower side wall of the shell. The inner and outer ring furnace tubes are installed sequentially from the inside to the outside in the shell cavity. An outer insulation layer is covered on the outer wall of the shell, which is usually made of insulation cotton. A cylindrical outer shell plate made of metal is wrapped around the outside of the outer insulation layer.

[0003] In organic heat carrier gas-fired heaters, due to the characteristics of the gas, the burner injects the gas upwards for combustion. Therefore, the top of the furnace is where the flue gas temperature is highest. To ensure the normal and safe operation of the heater, the sealing and insulation of the flue gas at the top of the furnace is crucial. Currently, the sealing between the furnace top cover and the furnace shell is achieved by inserting insulation cotton between the shell and the top cover and securing it with stainless steel wire mesh. Then, a ring of stainless steel round bars is welded onto the shell to support the insulation cotton. A flange is then welded to the outside of the top of the shell. Several rings of aluminum silicate fiber rope are laid between the furnace top cover and the flange. Finally, the furnace top cover and flange are connected and tightened with bolts to achieve a seal. This sealing structure has several drawbacks in actual use: Firstly, the insulation cotton between the shell and the furnace top cover is easily blown off by high-temperature flue gas after long-term use, leading to seal failure. Secondly, the furnace top cover and flange are fixed with bolts, and rainwater can erode into the outer insulation layer of the heating furnace through the bolt holes. After long-term erosion, the outer insulation layer will become moldy, rotten, and loose, and may even create holes. Not only will it fail to provide insulation, but it will also cause smoke leakage. Furthermore, the outer shell panel will be burned due to high temperature, which is not only unsightly but also poses a risk of burns. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide an external insulation flue gas sealing structure for an organic heat carrier gas heating furnace that can effectively prevent smoke leakage from the outer insulation layer of the heating furnace, prevent the outer shell plate from burning due to high temperature, has better sealing performance, higher safety performance, and a simple structure.

[0005] To solve the above-mentioned technical problems, this utility model adopts an external insulation flue gas sealing structure for an organic heat carrier gas-fired heating furnace, including a cylindrical shell, a furnace top cover installed on the top of the shell, a furnace bottom plate installed on the bottom of the shell, a burner, and vertical spiral inner and outer ring furnace tubes spaced apart within the shell cavity; a vertically arranged cylindrical top cover bottom plate is installed on the bottom surface of the furnace top cover, a through hole is opened in the middle of the furnace bottom plate, the burner is installed below the furnace bottom plate, and the burner head is... The furnace tubes pass through the through hole and are placed inside the housing cavity. A flue gas outlet is provided on the lower side wall of the housing for discharging flue gas. The inner and outer ring furnace tubes are installed sequentially from the inside to the outside of the housing cavity. An outer insulation layer is covered on the outer wall of the housing. A cylindrical outer shell plate made of metal is covered on the outside of the outer insulation layer. The housing also includes a cylindrical first sealing plate, a circular first support ring, a circular second support ring, a circular housing flange, and a cylindrical second sealing plate. The first support ring is arranged horizontally, and the first support ring is located inside the housing cavity. The wall surface is fully welded and sealed to the top surface of the shell. The shell flange is horizontally arranged and located on the outside of the shell, and the outer wall surface of the shell flange is fully welded and sealed to the bottom surface of the furnace top cover. The second sealing plate is vertically arranged, and the top surface of the second sealing plate is fully welded and sealed to the inner wall surface of the shell flange. The lower part of the second sealing plate is fully welded and sealed to the top surface of the first support ring. The first sealing plate is vertically arranged and located between the shell and the top cover bottom plate, and the lower part of the first sealing plate covers the upper outer wall of the outer ring furnace tube and is connected to the outer ring furnace tube. The furnace tubes are fully welded and sealed. The second support ring is horizontally arranged and located between the first sealing plate and the second sealing plate. The outer wall of the second support ring is fully welded and sealed to the top surface of the first support ring. The inner bottom surface of the second support ring is fully welded and sealed to the outer wall of the first sealing plate. In the annular space formed by the furnace top cover, the second sealing plate, the first support ring, the second support ring, the first sealing plate and the top cover bottom plate, a lower sealing layer made of lightweight castable material and an upper sealing and heat insulation layer made of lightweight refractory fiber material are filled from bottom to top.

[0006] In a preferred embodiment of this utility model, the inner cavity of the top cover bottom plate is filled with lightweight castable material, and the inner top surface of the second support plate ring is fully welded and sealed to the outer wall surface of the first sealing plate.

[0007] As a preferred embodiment of this utility model, it also includes a vertically arranged cylindrical rainproof steel ring, which is located outside the outer insulation layer, and the upper part of the rainproof steel ring is fully welded and sealed to the bottom surface of the furnace top cover.

[0008] By adopting the above structure, this utility model has the following beneficial effects: This utility model comprises a cylindrical first sealing plate, an annular first support ring, an annular second support ring, an annular shell flange, and a cylindrical second sealing plate. The first support ring is horizontally arranged and its inner wall is fully welded and sealed to the top surface of the shell. The shell flange is horizontally arranged and located on the outside of the shell, and its outer wall is fully welded and sealed to the bottom surface of the furnace top cover. The second sealing plate is vertically arranged and its top surface is fully welded and sealed to the inner wall of the shell flange. The lower part of the second sealing plate is fully welded and sealed to the top surface of the first support ring. The first sealing plate is vertically arranged and located between the shell and the top cover. Between the bottom plates, the lower part of the first sealing plate covers the upper outer wall of the outer ring furnace tube and is fully welded and sealed to the outer ring furnace tube. The second support plate ring is arranged horizontally and located between the first sealing plate and the second sealing plate. The outer wall of the second support plate ring is fully welded and sealed to the top surface of the first support plate ring. The inner bottom surface of the second support plate ring is fully welded and sealed to the outer wall of the first sealing plate. In the annular space formed by the furnace top cover, the second sealing plate, the first support plate ring, the second support plate ring, the first sealing plate and the top cover bottom plate, a lower sealing layer made of lightweight castable material and an upper sealing and heat insulation layer made of lightweight refractory fiber material are filled from bottom to top. This structure not only isolates high-temperature flue gas within the furnace chamber, preventing it from leaking into the outer shell or insulation layer, but also ensures that the outer wall of the shell flange is fully welded and sealed to the bottom of the furnace top cover. This eliminates the need for bolted connections used in existing technologies, thus preventing rainwater from seeping into the outer insulation layer through the bolt holes. This ensures the outer insulation layer maintains its insulation function over a long period, preventing the leakage and escape of high-temperature flue gas. It effectively prevents smoke leakage from the outer insulation layer and avoids damage to the outer insulation layer and shell panels caused by high-temperature flue gas, significantly improving the sealing and safety performance of the furnace.

[0009] The second support ring of this invention is fully welded and sealed to the outer wall of the first sealing plate, which makes the connection between the second support ring and the first sealing plate more secure, thereby making the overall sealing structure more robust and reliable.

[0010] This invention features a vertically arranged cylindrical rainproof steel ring, the upper part of which is fully welded and sealed to the bottom surface of the furnace top cover. This structure effectively prevents rainwater from seeping into the outer insulation layer of the heating furnace, further improving the furnace's sealing and safety performance.

[0011] This utility model has a simple structure, low manufacturing cost, convenient construction, better sealing performance, and higher safety performance, ensuring the long-term safe use of the equipment. Attached Figure Description

[0012] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0013] Figure 1This is a schematic diagram of an external insulation flue gas sealing structure for an organic heat carrier gas heating furnace according to this utility model.

[0014] Figure 2 for Figure 1 A magnified structural diagram of point A in the middle. Detailed Implementation

[0015] See Figure 1 , 2The diagram illustrates an external insulation flue gas sealing structure for an organic heat carrier gas-fired heating furnace, comprising a cylindrical shell 1, a furnace top cover 2 mounted on the top of the shell 1, a furnace bottom plate 3 mounted on the bottom of the shell 1, a burner 4, and vertically arranged spiral inner and outer ring furnace tubes 5 and 6 spaced apart within the inner cavity of the shell 1. The shell 1 and furnace bottom plate 3 are typically made of ordinary carbon steel. A vertically arranged cylindrical top cover bottom plate 2-1 is mounted on the bottom surface of the furnace top cover 2. A through hole 3-1 is formed in the middle of the furnace bottom plate 3. The burner 4 is bolted to the bottom of the furnace bottom plate 3, and the burner head 4-1 of the burner 4 passes through the through hole 3-1 and is positioned within the furnace bottom plate 3. The inner cavity of the shell 1 has a flue vent 1-1 on the lower side wall for discharging flue gas. The inner ring furnace tube 5 and the outer ring furnace tube 6 are installed sequentially from the inside to the outside of the inner cavity of the shell 1. An outer insulation layer 7 is covered on the outer wall of the shell 1. The outer insulation layer 7 is usually made of insulation cotton. A cylindrical outer shell plate 8 made of metal is covered on the outside of the outer insulation layer 7. It also includes a cylindrical first sealing plate 9, a circular first support ring 10, a circular second support ring 11, a circular shell flange 12, and a cylindrical second sealing plate 13. The first support ring 10 is arranged horizontally, and the inner wall surface of the first support ring 10 is fully welded and sealed to the top surface of the shell 1. The shell flange 12 is horizontally arranged and located outside the shell 1, and its outer wall is fully welded and sealed to the bottom surface of the furnace top cover 2. The second sealing plate 13 is vertically arranged, and its top surface is fully welded and sealed to the inner wall of the shell flange 12. The lower part of the second sealing plate 13 is fully welded and sealed to the top surface of the first support plate ring 10. The first sealing plate 9 is vertically arranged and located between the shell 1 and the top cover bottom plate 2-1, and its lower part covers the upper outer wall of the outer ring furnace tube 6 and is fully welded and sealed to the outer ring furnace tube 6. The second support plate ring 11 is horizontally arranged and located between the first sealing plate 9 and the second sealing plate 10. Between the plates 13, the outer wall of the second support plate ring 11 is fully welded and sealed to the top surface of the first support plate ring 10, and the inner bottom surface of the second support plate ring 11 is fully welded and sealed to the outer wall of the first sealing plate 9. In the annular space formed by the furnace top cover 2, the second sealing plate 13, the first support plate ring 10, the second support plate ring 11, the first sealing plate 9 and the top cover bottom plate 2-1, a lower sealing layer 14 made of lightweight castable and an upper sealing and heat insulation layer 15 made of lightweight refractory fiber material are sequentially filled from bottom to top. The lightweight castable is preferably made of aluminate cement, high alumina fine material, ceramsite, and some additives. Of course, other conventional materials can also be used, or refractory concrete can be used.The external insulation layer 7 and the lightweight refractory fiber material are preferably made of aluminum silicate fiber cotton. The first support ring 10, the second support ring 11, the shell flange 12, and the second sealing plate 13 are preferably made of boiler steel plate. The outer shell plate 8 and the top cover bottom plate 2-1 are preferably made of ordinary steel plate. The first sealing plate 9 is preferably made of stainless steel plate or chromium-molybdenum steel plate.

[0016] As a preferred embodiment of this utility model, such as Figure 1 , 2 As shown, the inner cavity of the top cover bottom plate 2-1 is filled with lightweight castable material, and the inner top surface of the second support plate ring 11 is fully welded and sealed to the outer wall surface of the first sealing plate 9.

[0017] As a preferred embodiment of this utility model, such as Figure 1 , 2 As shown, this utility model also provides a vertically arranged cylindrical rainproof steel ring 16, which is located outside the outer insulation layer 7, and the upper part of the rainproof steel ring 16 is fully welded and sealed to the bottom surface of the furnace top cover 2.

[0018] When this utility model is working, such as Figure 1 As shown, the burner 4 injects the gas upward for combustion. The high-temperature flue gas generated by combustion flows from bottom to top in the furnace, and then flows back from between the inner ring furnace tube 5 and the outer ring furnace tube 6 to the lower flue outlet 1-1 for discharge.

[0019] After trial use, this utility model avoids the drawbacks of smoke leakage from the outer insulation layer of existing heating furnaces, prevents the outer shell from burning due to high temperature, and has good sealing performance, high safety performance, and simple structure, achieving good practical results.

Claims

1. An external insulation flue gas sealing structure for an organic heat carrier gas-fired heating furnace, comprising a cylindrical shell (1), a furnace top cover (2) installed on the top of the shell (1), a furnace bottom plate (3) installed on the bottom of the shell (1), a burner (4), and vertically arranged spiral inner ring furnace tubes (5) and outer ring furnace tubes (6) spaced apart within the inner cavity of the shell (1); a vertically arranged cylindrical top cover bottom plate (2-1) is installed on the bottom surface of the furnace top cover (2), and a through hole (3-1) is opened in the middle of the furnace bottom plate (3), wherein the burner... The burner (4) is installed below the furnace bottom plate (3), and the burner head (4-1) of the burner (4) passes through the through hole (3-1) and is placed in the inner cavity of the shell (1). A flue (1-1) for discharging flue gas is provided on the lower side wall of the shell (1). The inner ring furnace tube (5) and the outer ring furnace tube (6) are installed in the inner cavity of the shell (1) from the inside to the outside. An outer heat insulation layer (7) is covered on the outer wall of the shell (1), and a cylindrical outer shell plate (8) made of metal is covered on the outside of the outer heat insulation layer (7). The characteristic is that: It also includes a cylindrical first sealing plate (9), an annular first support ring (10), an annular second support ring (11), an annular shell flange (12), and a cylindrical second sealing plate (13); the first support ring (10) is arranged horizontally, and the inner wall of the first support ring (10) is fully welded and sealed to the top surface of the shell (1); the shell flange (12) is arranged horizontally and located outside the shell (1), and the outer wall of the shell flange (12) is fully welded and sealed to the bottom surface of the furnace top cover (2); the second sealing plate (13) is arranged vertically, and the top surface of the second sealing plate (13) is fully welded and sealed to the inner wall of the shell flange (12); the lower part of the second sealing plate (13) is fully welded and sealed to the top surface of the first support ring (10); the first sealing plate (9) is arranged vertically and located on the shell (1). Between the top cover and bottom plate (2-1), and the lower part of the first sealing plate (9) covers the upper outer wall of the outer ring furnace tube (6) and is fully welded and sealed to the outer ring furnace tube (6). The second support plate ring (11) is arranged horizontally and located between the first sealing plate (9) and the second sealing plate (13). The outer wall surface of the second support plate ring (11) is fully welded and sealed to the top surface of the first support plate ring (10). The inner bottom surface of the second support plate ring (11) is fully welded and sealed to the outer wall surface of the first sealing plate (9). In the annular space formed by the furnace top cover (2), the second sealing plate (13), the first support plate ring (10), the second support plate ring (11), the first sealing plate (9) and the top cover and bottom plate (2-1), a lower sealing layer (14) made of lightweight castable material and an upper sealing and heat insulation layer (15) made of lightweight refractory fiber material are sequentially filled from bottom to top.

2. The external insulation flue gas sealing structure for an organic heat carrier gas-fired heating furnace according to claim 1, characterized in that: The inner cavity of the top cover bottom plate (2-1) is filled with lightweight castable material, and the inner top surface of the second support plate ring (11) is fully welded and sealed to the outer wall surface of the first sealing plate (9).

3. The external insulation flue gas sealing structure for an organic heat carrier gas-fired heating furnace according to claim 1 or 2, characterized in that: It also includes a vertically arranged cylindrical rainproof steel ring (16), which is located outside the outer insulation layer (7), and the upper part of the rainproof steel ring (16) is fully welded and sealed to the bottom surface of the furnace top cover (2).

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