Explosion door special for heating furnace and closed combustion heating furnace
By using rupture discs and multi-layer insulation modules in the explosion-proof door of the heating furnace, the problems of sealing and inaccurate opening pressure control of traditional explosion-proof doors are solved, achieving efficient pressure relief and insulation effects, and improving equipment safety and combustion efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANDONG CHAMBROAD PETROCHEMICALS CO LTD
- Filing Date
- 2025-05-21
- Publication Date
- 2026-05-12
AI Technical Summary
Traditional explosion-proof doors for heating furnaces are inadequate in terms of sealing performance and opening sensitivity, leading to frequent leaks and inaccurate control of opening pressure, which affects equipment safety and combustion efficiency.
A rupture disc with a rupture guide wire is used as a safety component of the explosion-proof door, and multiple layers of insulation modules are stacked inside the door frame to improve sealing and insulation performance, ensuring accurate rupture and rapid pressure relief of the rupture disc.
It improves the opening sensitivity and sealing performance of explosion-proof doors, reduces heat loss, ensures production safety and combustion efficiency, and lowers maintenance costs.
Smart Images
Figure CN224230702U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of heating furnace technology, and more specifically, to a special explosion-proof door for heating furnaces. Furthermore, this utility model also relates to a sealed combustion heating furnace including the aforementioned special explosion-proof door. Background Technology
[0002] In industrial production, heating furnaces, as common heat energy conversion equipment, are widely used in many fields such as petroleum, chemical, and metallurgy. Explosion-proof doors, as important safety components of heating furnaces, play a crucial role. When the pressure inside the heating furnace suddenly rises above the safety threshold due to various reasons (such as abnormal fuel combustion, pressure control system malfunction, etc.), the explosion-proof door can open in time to release pressure, preventing serious accidents such as explosions, thereby ensuring the safety of equipment and personnel.
[0003] Traditional explosion-proof doors for heating furnaces primarily employ a standard gravity-operated door structure, controlling opening pressure through springs or counterweights. However, this traditional structure suffers from several insurmountable drawbacks. First, regarding sealing performance, traditional explosion-proof doors, subjected to prolonged exposure to harsh conditions such as high temperature, high pressure, and vibration, are prone to aging and deformation of the seals between the door body and frame, leading to frequent leaks. Leaks not only waste energy but can also release high-temperature gases and flames from the furnace into the surrounding environment, posing a serious threat to the safety of operators. Second, the opening pressure control of traditional explosion-proof doors is not precise enough. Over time, the elasticity or weight of springs or counterweights changes, causing a deviation between the actual opening pressure and the design pressure. If the opening pressure is too high, the door may fail to open in time to release pressure when the internal pressure of the furnace reaches a dangerous level, increasing the risk of explosion; if the opening pressure is too low, the door may open erroneously at normal operating pressure, affecting the normal operation of the furnace. Furthermore, after repeated opening and closing, traditional explosion-proof doors experience increased wear between the door body and frame, further reducing their sealing performance and service life. This necessitates frequent maintenance and replacement, increasing production costs and equipment downtime. For sealed heating furnaces, the sealing requirements of the combustion environment are extremely high. These leakage problems with traditional explosion-proof doors severely affect the achievement of sealed combustion conditions, thereby impacting the furnace's combustion efficiency and energy utilization.
[0004] In conclusion, how to solve the problems of insufficient opening sensitivity and inadequate sealing of explosion-proof doors is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content
[0005] In view of this, the purpose of this utility model is to provide a special explosion-proof door for heating furnaces. By using a rupture disc with a rupture guide line as a safety component of the explosion-proof door, the opening sensitivity of the explosion-proof door is effectively improved and the sealing performance of the explosion-proof door is effectively improved. At the same time, the addition of a heat insulation component inside the door frame increases the heat insulation performance of the explosion-proof door and further reduces the energy waste caused by heat loss at the rupture disc.
[0006] Another objective of this utility model is to provide a sealed combustion heating furnace that includes the aforementioned explosion-proof door for heating furnaces, possessing the same technical features and capable of solving the same technical problems.
[0007] To achieve the above objectives, this utility model provides the following technical solution:
[0008] An explosion-proof door for heating furnaces is used for installation within the furnace wall and insulation layer of the heating furnace; the explosion-proof door for heating furnaces includes:
[0009] The door frame is fixedly and extends through the furnace wall and insulation layer;
[0010] The insulation component is disposed inside the door frame and together with the furnace wall and the insulation layer, forms the insulation layer of the heating furnace. The insulation component is provided with at least three layers of insulation module stacks along the center line of the door frame, and the stacking directions of the insulation modules in two adjacent layers of insulation module stacks are different.
[0011] A rupture disc, which is fixed and sealed by bolts at one end of the door frame outside the heating furnace, has a rupture guide line on its surface to guide the rupture direction.
[0012] Preferably, the thermal insulation component includes, in sequence along the centerline of the door frame, a nano-insulation module stack layer, a nanofiber blanket stack layer, and a ceramic nanofiber blanket stack layer;
[0013] The stacking direction of the nano-insulation module stack layer and the ceramic nanofiber blanket stack layer is coplanar with the surface where the furnace wall and the insulation layer are located.
[0014] The stacking direction of the nanofiber blanket stack is perpendicular to the surface where the furnace wall and the insulation layer are located.
[0015] Preferably, the seams of the nano-insulation modules between two adjacent stacked layers within the nano-insulation module stack layer are not aligned.
[0016] And / or,
[0017] The seams of the nanofiber blankets between two adjacent stacked layers within the nanofiber blanket stack are not aligned.
[0018] And / or,
[0019] The ceramic nanofiber blankets in the stacked layers do not have misaligned seams between adjacent stacked layers.
[0020] Preferably, an expanded graphite sealing strip is filled between two adjacent nano-insulation modules in the stacked layer of the nano-insulation modules and / or between the nano-insulation module and the adjacent inner wall of the door frame;
[0021] And / or,
[0022] The expanded graphite sealing strip is filled between two adjacent nanofiber blankets in the nanofiber blanket stack layer and / or between the nanofiber blanket and the adjacent inner wall of the door frame.
[0023] And / or,
[0024] The expanded graphite sealing strip is filled between two adjacent ceramic nanofiber blankets in the stacked layer of ceramic nanofiber blankets and / or between the ceramic nanofiber blanket and the adjacent inner wall of the door frame.
[0025] Preferably, the blasting guide line includes a frame-type guide line and a cross-type guide line, wherein the endpoints of the cross-type guide line overlap with the corner endpoints of the frame-type guide line.
[0026] Preferably, the rupture disc has a square structure, the frame-shaped guide line is a square guide line, the cross-shaped guide line is an X-shaped guide line, and the four endpoints of the X-shaped guide line overlap with the four corner endpoints of the square guide line.
[0027] Preferably, the rupture disc is pressed against the end of the door frame by a pressure ring, and the pressure ring is fixedly connected to the door frame by bolts;
[0028] Furthermore, sealing rings are respectively provided between the two sides of the rupture disc and the end face of the door frame and the pressing surface of the pressure ring.
[0029] Preferably, the sealing ring between the rupture disc and the end face of the door frame is a high-temperature silicone rubber sealing ring;
[0030] The sealing ring between the rupture disc and the pressure ring is a metal spiral wound gasket sealing ring.
[0031] Preferably, it also includes a protective frame assembly disposed outside the heating furnace for containing fragments after the rupture disc explodes;
[0032] The protective frame assembly is fixedly connected to the door frame.
[0033] A sealed combustion heating furnace, including any one of the above-mentioned explosion-proof doors for heating furnaces.
[0034] The explosion-proof door for heating furnaces provided by this utility model has at least the following advantages compared with the prior art:
[0035] 1. Using rupture discs as safety components of explosion-proof doors, when the pressure inside the heating furnace exceeds the safety value, the rupture discs can quickly burst, thereby rapidly releasing the pressure inside the heating furnace and ensuring production safety. Compared with the traditional flip-opening explosion-proof doors, rupture discs have the advantages of precise burst pressure and no wear, i.e., high sensitivity and no decrease in airtightness due to wear.
[0036] 2. A rupture guide line is set on the surface of the rupture disc to effectively guide the rupture direction of the rupture disc and prevent the fragments after rupture from obstructing the pressure relief channel; and the addition of the rupture guide line can further improve the control accuracy of the rupture pressure.
[0037] 3. Install no less than three layers of insulation modules inside the door frame to further improve the insulation performance of the explosion-proof door, reduce internal heat loss, and reduce the impact of internal high temperature on the burst pressure of the rupture disc.
[0038] 4. The insulation modules inside the insulation component are stacked, which allows the insulation component to be quickly blown open by the airflow when depressurization occurs, without obstructing the depressurization channel. Furthermore, the insulation modules can be reused when the explosion-proof door is repaired, thereby reducing the cost of use. At the same time, the stacking directions of the insulation modules in the stacked layers of adjacent insulation modules are different, thereby preventing the gaps between the insulation modules from forming heat dissipation channels, thus improving the overall insulation performance of the insulation component.
[0039] The sealed combustion heating furnace provided by this utility model includes the aforementioned explosion-proof door for heating furnaces and has the same beneficial effects. Attached Figure Description
[0040] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.
[0041] Figure 1 This is a structural schematic diagram of the explosion-proof door for heating furnaces provided by this utility model;
[0042] Figure 2 for Figure 1 Enlarged view of point A in the middle;
[0043] Figure 3 This is a schematic diagram of the assembly of the rupture disc provided by this utility model;
[0044] Figure 4This is a schematic diagram of the stacked layer of the nano-insulation module provided by this utility model;
[0045] Figure 5 This is a schematic diagram of the structure of the ceramic nanofiber blanket stacked layer provided by this utility model.
[0046] In the picture:
[0047] 1. Door frame;
[0048] 2. Thermal insulation components; 21. Nano-insulation module stacked layer; 22. Nanofiber blanket stacked layer; 23. Ceramic nanofiber blanket stacked layer; 24. Expanded graphite sealing strip;
[0049] 3. Rupture disc; 31. Frame-type guide wire; 32. Fork-type guide wire;
[0050] 4. Protective frame assembly; 41. Pressure ring;
[0051] 5. Furnace wall and insulation layer;
[0052] 6. High-temperature silicone rubber sealing ring; 7. Metal spiral wound gasket sealing ring. Detailed Implementation
[0053] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0054] The core of this utility model is to provide a special explosion-proof door for heating furnaces. By using a rupture disc with a rupture guide line as a safety component of the explosion-proof door, the opening sensitivity of the explosion-proof door is effectively improved and the sealing performance of the explosion-proof door is effectively improved. At the same time, an insulation component is added inside the door frame to increase the insulation performance of the explosion-proof door and further reduce energy waste caused by heat loss at the rupture disc.
[0055] Another core aspect of this utility model is to provide a sealed combustion heating furnace that includes the aforementioned explosion-proof door for heating furnaces, possessing the same technical features and capable of solving the same technical problems.
[0056] Please refer to Figure 1 An explosion-proof door for heating furnaces, used for installation within the furnace wall and insulation layer 5 of the heating furnace; the explosion-proof door for heating furnaces includes:
[0057] The door frame 1 is fixed and extends through the furnace wall and the insulation layer 5;
[0058] The insulation component 2 is located inside the door frame 1 and together with the furnace wall and the insulation layer 5, forms the insulation layer of the heating furnace. The insulation component 2 has at least three layers of insulation module stacking along the center line of the door frame 1, and the stacking directions of the insulation modules in two adjacent layers of insulation module stacking are different.
[0059] The rupture disc 3 is fixed and sealed at one end of the door frame 1 outside the heating furnace by bolts, and the surface of the rupture disc 3 is provided with a rupture guide line for guiding the rupture direction.
[0060] like Figure 1 As shown, the door frame 1 is installed through and fixed inside the furnace wall and insulation layer 5. The door frame 1 can be used as a pressure relief channel. The explosion-proof door can be sealed by simply closing the door frame 1, and the heating furnace can be depressurized by opening the door frame 1.
[0061] Meanwhile, an insulation component 2 is installed inside the door frame 1 so that the insulation component 2 and the insulation layer of the furnace wall together form a complete insulation layer, reducing heat loss inside the furnace, that is, reducing heat loss at the explosion-proof door location.
[0062] The insulation component 2 is provided with at least three sets of insulation module stacking layers along the center line of the door frame 1. By stacking different insulation module stacking layers in different directions, the conduction of seams in different stacking layers is avoided, thereby reducing the heat dissipation channels in the insulation component 2 and further improving the insulation performance of the insulation component 2.
[0063] Meanwhile, the insulation module stacking layer is used to form insulation component 2, which enables the insulation module to be quickly blown away when the heating furnace is depressurized, thereby reducing the blockage of the pressure relief channel by insulation component 2, thus achieving rapid pressure relief and ensuring production safety.
[0064] Moreover, by using the rupture disc 3 as a safety component of the explosion-proof door, when the internal pressure of the heating furnace reaches the bursting pressure of the rupture disc 3, the rupture disc 3 can burst rapidly, opening the passage of the door frame 1 and achieving rapid pressure relief. It has the characteristics of high pressure relief sensitivity. Furthermore, the rupture disc 3 and the door frame 1 are fixedly connected, and there is no overturning or wear, thus effectively ensuring the airtightness of the heating furnace.
[0065] Meanwhile, the rupture disc 3 is placed at one end of the door frame 1 outside the heating furnace, and the heat inside the heating furnace is isolated by the heat insulation component 2, thus reducing the influence of the heat inside the heating furnace on the rupture pressure of the rupture disc 3.
[0066] In some embodiments, the thermal insulation component 2 includes, in sequence along the center line of the door frame 1, a nano-thermal insulation module stack layer 21, a nanofiber blanket stack layer 22, and a ceramic nanofiber blanket stack layer 23;
[0067] The stacking direction of the nano-insulation module stack layer 21 and the ceramic nanofiber blanket stack layer 23 is coplanar with the surface where the furnace wall and insulation layer 5 are located.
[0068] The stacking direction of the nanofiber blanket stack layer 22 is perpendicular to the surface where the furnace wall and the insulation layer 5 are located.
[0069] like Figure 1 As shown, the insulation component 2 includes, in sequence along the center line of the door frame 1, a nano-insulation module stack layer 21, a nanofiber blanket stack layer 22, and a ceramic nanofiber blanket stack layer 23. The stacking direction of the nano-insulation module stack layer 21 and the ceramic nanofiber blanket stack layer 23 is coplanar with the surface of the furnace wall and the insulation layer 5. Therefore, when the nano-insulation module and the ceramic nanofiber blanket are stacked, their stacking stability is ensured only by the mirror extrusion force. Their stacking direction is perpendicular to the airflow direction during depressurization. Therefore, the depressurized airflow can quickly blow the nano-insulation module stack layer 21 and the ceramic nanofiber blanket stack layer 23 apart, thereby reducing the obstruction to the depressurization channel.
[0070] A nanofiber blanket stack layer 22 is set between the nano-insulation module stack layer 21 and the ceramic nanofiber blanket stack layer 23. The stacking direction of the nanofiber blanket is consistent with the direction of the pressure relief airflow. Therefore, the nanofiber blanket can directly block the seam gaps in the nano-insulation module stack layer 21 and the ceramic nanofiber blanket stack layer 23, that is, block the heat dissipation channel in the insulation component 2 and reduce the heat passing through the insulation component 2.
[0071] In some embodiments, the seams of the nano-insulation modules between two adjacent stacked layers within the nano-insulation module stack 21 are not aligned.
[0072] And / or,
[0073] The seams of the nanofiber blankets between two adjacent stacked layers within the nanofiber blanket stacked layer 22 are not aligned.
[0074] And / or,
[0075] The joints of the ceramic nanofiber blankets between two adjacent stacked layers within the ceramic nanofiber blanket stacked layer 23 are not aligned.
[0076] like Figure 4 and Figure 5 As shown, the insulation modules or fiber blankets in the nano-insulation module stacking layer 21, nanofiber blanket stacking layer 22 and ceramic nanofiber blanket stacking layer 23 are all stacked in a staggered manner to avoid the seams of different stacking layers from touching. Therefore, the insulation modules or fiber blankets in adjacent stacking layers can provide friction to each other to improve the overall stability.
[0077] In some embodiments, an expanded graphite sealing strip 24 is filled between two adjacent nano-insulation modules in the nano-insulation module stack layer 21 and / or between the nano-insulation module and the inner wall of the adjacent door frame 1.
[0078] And / or,
[0079] An expanded graphite sealing strip 24 is filled between two adjacent nanofiber blankets in the nanofiber blanket stack layer 22 and / or between the nanofiber blanket and the inner wall of the adjacent door frame 1.
[0080] And / or,
[0081] An expanded graphite sealing strip 24 is filled between two adjacent ceramic nanofiber blankets in the ceramic nanofiber blanket stack layer 23 and / or between the ceramic nanofiber blanket and the inner wall of the adjacent door frame 1.
[0082] like Figure 4 and Figure 5 As shown, due to the influence of the cross-sectional shape of the door frame 1, the specifications of the insulation module and the fiber blanket, there are certain gaps between the insulation modules and the fiber blankets, between the fiber blankets, between the insulation modules and the inner wall of the door frame 1, and between the fiber blankets and the inner wall of the door frame 1 when the insulation modules and fiber blankets are stacked. Therefore, the gaps are filled with expanded graphite sealing strips 24. When the expanded graphite sealing strips 24 are heated, they can expand and fill the original gaps, reduce the heat dissipation channels in the insulation component 2, and improve the insulation effect.
[0083] In some embodiments, the blasting guide line includes a frame-shaped guide line 31 and a cross-shaped guide line 32, wherein the endpoint of the cross-shaped guide line 32 overlaps with the corner endpoint of the frame-shaped guide line 31.
[0084] like Figure 3 As shown, the setting of the frame-shaped guide line 31 and the fork-shaped guide line 32 helps to further improve the accuracy control of the burst pressure of the rupture disc 3, that is, to further improve the sensitivity of the explosion-proof door opening.
[0085] In some embodiments, the rupture disc 3 has a square structure, the frame-shaped guide line 31 is a square guide line, and the cross-shaped guide line 32 is an X-shaped guide line. The four endpoints of the X-shaped guide line overlap with the four corner endpoints of the square guide line.
[0086] like Figure 3 As shown, when the pressure inside the heating furnace reaches the safety preset value, the rupture disc 3 rapidly ruptures along the rupture guide line. With the help of the square guide line and X-shaped guide line design, the rupture disc 3 ruptures completely within the projected area of the pressure relief channel, reducing the blockage of the pressure relief channel and helping to release the pressure inside the heating furnace quickly, thus ensuring production safety.
[0087] In some embodiments, the rupture disc 3 is pressed against the end of the door frame 1 by a pressure ring 41, and the pressure ring 41 is fixedly connected to the door frame 1 by bolts;
[0088] Furthermore, sealing rings are provided between the two sides of the rupture disc 3 and the end face of the door frame 1 and the pressing surface of the pressure ring 41, respectively.
[0089] like Figure 1 and Figure 2 As shown, the rupture disc 3 is pressed and fixed by the pressure ring 41, which helps to reduce the difficulty of replacing the rupture disc 3 and improve the sealing between the rupture disc 3 and the door frame 1, and facilitates the rapid replacement of the rupture disc 3 after it ruptures.
[0090] Meanwhile, sealing rings are installed on both sides of the sealing surface of the rupture disc 3, which helps to further improve the sealing performance of the rupture disc 3 and reduce energy loss at the explosion-proof door.
[0091] In some embodiments, the sealing ring between the rupture disc 3 and the end face of the door frame 1 is a high-temperature silicone rubber sealing ring 6;
[0092] The sealing ring between the rupture disc 3 and the pressure ring 41 is a metal spiral wound gasket sealing ring 7.
[0093] like Figure 2 As shown, a high-temperature silicone rubber sealing ring 6 is used in the sealing surface between the rupture disc 3 and the door frame 1, which helps to reduce the impact of high temperature on the sealing performance.
[0094] A metal spiral wound gasket 7 is provided between the rupture disc 3 and the pressure ring 41, which has excellent resilience and high temperature resistance, further improving the sealing performance of the rupture disc 3 after installation.
[0095] In some embodiments, a protective frame assembly 4 disposed outside the heating furnace is also included for containing fragments of the rupture disc 3 after it explodes;
[0096] The protective frame assembly 4 is fixedly connected to the door frame 1.
[0097] like Figure 1 As shown, a protective frame assembly 4 is installed on the outside of the explosion-proof door. The fragments after the rupture disc 3 explodes can be blocked and contained by the protective frame assembly 4, preventing the fragments from injuring people, and will not affect the release of the pressure relief airflow.
[0098] In some embodiments, the protective frame assembly 4 is fixedly connected to the pressure ring 41. After the pressure ring 41 is removed, the protective frame assembly 4 is detached from the door frame 1, which facilitates the replacement of the rupture disc 3.
[0099] In addition to the explosion-proof door for heating furnaces disclosed in the above embodiments, this utility model also provides a sealed combustion heating furnace including the above-mentioned explosion-proof door for heating furnaces. For the structure of other parts of the sealed combustion heating furnace, please refer to the prior art, which will not be described in detail here.
[0100] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.
[0101] The above provides a detailed description of the explosion-proof door for heating furnaces and the sealed combustion heating furnace provided by this utility model. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that those skilled in the art can make various improvements and modifications to this utility model without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this utility model.
Claims
1. A special explosion-proof door for heating furnaces, used for installation inside the furnace wall and insulation layer (5) of a heating furnace, characterized in that, The explosion-proof door for the heating furnace includes: The door frame (1) is fixed and penetrates the furnace wall and the insulation layer (5); The heat insulation component (2) is disposed inside the door frame (1) and together with the furnace wall and the heat insulation layer (5) forms the heat insulation layer of the heating furnace. The heat insulation component (2) is provided with at least three layers of heat insulation module stacking along the center line of the door frame (1), and the stacking directions of the heat insulation modules in adjacent two layers of heat insulation module stacking are different. A rupture disc (3) is fixed and sealed at one end of the door frame (1) outside the heating furnace by bolts, and a rupture guide line is provided on the surface of the rupture disc (3) to guide the rupture direction.
2. The explosion-proof door for heating furnaces according to claim 1, characterized in that, The thermal insulation component (2) includes, in sequence along the center line of the door frame (1), a nano thermal insulation module stack layer (21), a nanofiber blanket stack layer (22), and a ceramic nanofiber blanket stack layer (23). The stacking direction of the nano-insulation module stack layer (21) and the ceramic nanofiber blanket stack layer (23) is coplanar with the surface where the furnace wall and insulation layer (5) are located; The stacking direction of the nanofiber blanket stack (22) is perpendicular to the surface where the furnace wall and the insulation layer (5) are located.
3. The explosion-proof door for heating furnaces according to claim 2, characterized in that, The nano-insulation module joints between two adjacent stacked layers in the nano-insulation module stack layer (21) are not aligned. And / or, The nanofiber blanket seams between two adjacent stacked layers in the nanofiber blanket stacked layer (22) are not aligned; And / or, The ceramic nanofiber blanket seams between adjacent stacked layers (23) are not aligned.
4. The explosion-proof door for heating furnaces according to claim 2, characterized in that, Expanded graphite sealing strips (24) are filled between two adjacent nano-insulation modules in the stacked layer (21) of the nano-insulation modules and / or between the nano-insulation modules and the inner wall of the adjacent door frame (1). And / or, The expanded graphite sealing strip (24) is filled between two adjacent nanofiber blankets in the nanofiber blanket stack layer (22) and / or between the nanofiber blanket and the inner wall of the adjacent door frame (1). And / or, The expanded graphite sealing strip (24) is filled between two adjacent ceramic nanofiber blankets in the stacked layer (23) and / or between the ceramic nanofiber blanket and the inner wall of the adjacent door frame (1).
5. The explosion-proof door for heating furnaces according to claim 1, characterized in that, The blasting guide line includes a frame-type guide line (31) and a cross-type guide line (32), the endpoints of which overlap with the corner endpoints of the frame-type guide line (31).
6. The explosion-proof door for heating furnaces according to claim 5, characterized in that, The rupture disc (3) has a square structure, the frame-shaped guide line (31) is a square guide line, the cross-shaped guide line (32) is an X-shaped guide line, and the four endpoints of the X-shaped guide line overlap with the four corner endpoints of the square guide line.
7. The explosion-proof door for heating furnaces according to claim 1, characterized in that, The rupture disc (3) is pressed against the end of the door frame (1) by a pressure ring (41), and the pressure ring (41) is fixedly connected to the door frame (1) by bolts; Furthermore, sealing rings are respectively provided between the two sides of the rupture disc (3) and the end face of the door frame (1) and the pressing surface of the pressure ring (41).
8. The explosion-proof door for heating furnaces according to claim 7, characterized in that, The sealing ring between the rupture disc (3) and the end face of the door frame (1) is a high-temperature silicone rubber sealing ring (6). The sealing ring between the rupture disc (3) and the pressure ring (41) is a metal spiral wound gasket sealing ring (7).
9. The explosion-proof door for heating furnaces according to any one of claims 1-8, characterized in that, It also includes a protective frame assembly (4) disposed outside the heating furnace for containing fragments after the rupture disc (3) explodes; The protective frame assembly (4) is fixedly connected to the door frame (1).
10. A sealed combustion heating furnace, characterized in that, Includes the explosion-proof door for heating furnaces as described in any one of claims 1-9.