High sealing coke oven door

Abstract

The present application relates to the technical field of energy saving and environmental protection industry, and in particular to a high-sealing coke oven door, which comprises a door body, a sealing blade edge, a door frame, a blade edge web, a small door, a top brick groove, door bricks and a main sealing gasket. The top of the door body is provided with the top brick groove, the small door is embedded in the top brick groove in a press-in structure, a multi-stage stepped sealing surface is arranged between the small door and the top brick groove, and the small door is provided with an elastic pre-tightening assembly arranged in a circumferential direction. The small door with the embedded multi-stage stepped sealing, the blade edge web with the long waist hole array, the sealing blade edge with the sealing surface of the door frame formed by precise grinding, the main sealing gasket and the auxiliary sealing gasket made of polycrystalline ceramic fiber material, and the spring pre-tightening assembly arranged in the whole region form an overall collaborative sealing structure, so that the door can stably maintain a sealing pressure of 600 mm water column under the alternating operation environment of high and low temperatures in the carbonization chamber.

Description

Technical Field

[0001] This invention relates to the field of energy-saving and environmental protection equipment technology, and more specifically, to a highly airtight coke oven door. Background Technology

[0002] Coke oven doors are auxiliary devices used to open and close the furnace openings at both ends of the coke oven's carbonization chamber. When closed, they isolate the carbonization chamber from the atmosphere; when open, they allow the coke pusher rod to push out coke. They are divided into machine-side doors (small doors through which the coal leveling rod passes) and coke-side doors. Their structure includes components such as the outer shell, lining bricks, knife-edge doors, and crossbars. Modern coke ovens mostly use self-sealing knife-edge doors, which achieve a seal by using springs or bolts to keep the knife edge tightly against the door frame.

[0003] According to existing technology, the traditional coke oven door is a sealing component at both ends of the carbonization chamber. It consists of a cast iron door body, refractory lining bricks, elastic knife-edge seal, horizontal iron, upper and lower top screws, and a small furnace door. Its core function is to isolate the high-temperature carbonization chamber and seal the raw coal gas. The traditional small furnace door has a simple flat butt joint structure. Due to the lack of a multi-layer interlocking sealing structure, the high-temperature airflow inside the furnace directly contacts the sealing component. The continuous high temperature will quickly destroy the sealing gasket and contact plate, resulting in a problem of continuous leakage points. Summary of the Invention

[0004] This invention provides a high-sealing coke oven door, which forms an integrated and synergistic sealing structure through an embedded multi-stage stepped sealing small door, a bladed web plate with an array of elongated holes, a sealing blade edge and door frame sealing mating surface formed by precision grinding, a main sealing gasket and a secondary sealing gasket made of polycrystalline ceramic fiber material, and a spring pre-tightening assembly arranged throughout the entire area. This allows the oven door to stably maintain a sealing pressure of 600 mm water column under the alternating high and low temperature operating environment of the carbonization chamber. Compared with conventional coke oven doors, it can significantly suppress the leakage of raw coal gas and meet the ultra-low emission control requirements of coking production. This solves the problem mentioned in the background technology, namely: due to the lack of a multi-layer embedded sealing structure, the high-temperature airflow inside the oven directly contacts the sealing components, and the continuous high temperature burning will quickly destroy the sealing gasket and contact plate, resulting in the problem of continuous leakage points.

[0005] To achieve the above objectives, a high-sealing coke oven door is provided, comprising a door body, a sealing blade, a door frame, a blade web, a small door, a top brick groove, a door brick, and a main sealing gasket. The top of the door body is provided with a top brick groove, and the small door is an embedded pressing structure located inside the top brick groove. A multi-stage stepped sealing surface is provided between the small door and the top brick groove, and an elastic pre-tightening component is provided on the outside of the small door arranged circumferentially. The blade edge web is provided with an array of elongated holes, and the array of elongated holes has multiple elongated holes inside. The blade edge web slides with the furnace door body through the elongated holes to compensate for the expansion and contraction deformation of the furnace door caused by heat. The cutting edge of the sealing blade and the sealing surface of the furnace door frame form a line contact sealing fit when the furnace door is closed; A main sealing gasket is laid between the furnace door brick and the furnace door body; The furnace door is also equipped with a spring preload assembly, which includes a door bolt spring and multiple top pressure seats distributed at intervals along the circumference of the furnace door. The preload force of the top pressure seats is transmitted and distributed outside the sealing blade edge to drive the cutting edge of the sealing blade edge to press against the sealing surface of the furnace door frame.

[0006] In the above technical solution, the elastic pre-tightening assembly includes multiple high-temperature resistant disc springs arranged circumferentially along the stepped sealing surface. The multi-stage stepped sealing surface is a stepped annular sealing surface with two or more interlocking stages. The elastic pre-tightening assembly also includes a secondary sealing gasket. The thickness of the secondary sealing gasket after compression is 3mm. A sliding plate is provided between the secondary sealing gasket and the blade edge web, and the sliding plate is arranged circumferentially along the stepped sealing surface. The sliding plate is a thin metal plate. One side of the sliding plate is attached to the blade edge web, and the side of the sliding plate away from the blade edge web is attached to the secondary sealing gasket and the stepped sealing surface. The sliding plate generates sliding displacement relative to the secondary sealing gasket to distribute the clamping force of the elastic pre-tightening assembly and adapt to the high-temperature expansion and contraction deformation of the blade edge web.

[0007] Secondly, the blade edge web is a stainless steel plate structure. The elongated holes are arranged in multiple rows along the height direction of the furnace door, with each row of elongated holes equally spaced and staggered between adjacent rows. The long axis of the elongated holes is consistent with the height direction of the furnace door, and the length of the long axis is 3 to 8 times the length of the short axis. The distance between two adjacent elongated holes is 1.2 to 2.0 times the length of the long axis. The grinding accuracy of the sealing blade edge is ≤0.02mm. The blade edge forms a closed annular precision line sealing blade edge along its entire length. The cross-sectional shape of the blade edge is a pointed angle, and the pointed angle of the pointed angle is 30° to 60°.

[0008] Furthermore, based on the above, the flatness of the sealing surface of the furnace door frame is ≤0.03mm / m, the surface roughness Ra is ≤1.6μm, and the grinding texture of the sealing surface is a continuous annular texture. The main sealing gasket is made of polycrystalline ceramic fiber composite material with an alumina content ≥72%, a temperature resistance ≥1250℃, a compression resilience ≥85%, and a compression permanent deformation rate ≤5%. The thickness of the main sealing gasket is 5mm to 15mm, and it is laid on the outside of the furnace door bricks and the furnace door body. When the furnace door is in operation, it is compressed to 40% to 60% of its original thickness.

[0009] Meanwhile, two sets of door bolt springs are provided, respectively located at both ends of the furnace door in the height direction. 78 sets of top pressure seats are provided, evenly distributed along the circumference of the furnace door. Each set of top pressure seats includes a top pressure spring and a guide sleeve. The preload of the top pressure spring is 200N to 500N. The stepped sealing surface of the small furnace door isolates the sealing blade and blade web from the high-temperature airflow inside the furnace when the furnace door is in operation. The auxiliary sealing element in the elastic preload assembly forms an elastic compensation layer outside the stepped sealing surface. The embedded stepped sealing structure of the small furnace door, together with the elastic preload assembly, the elongated hole structure of the blade web, the ground mating surface of the sealing blade and the furnace door frame, the secondary sealing gasket, and the spring preload assembly, constitute a quadruple sealing system, which keeps the furnace door sealing pressure stably at 600mm water column under the high-temperature alternating conditions of the coke oven carbonization chamber.

[0010] Compared with the prior art, the beneficial effects of the present invention are as follows: This high-sealing coke oven door utilizes an embedded multi-stage stepped sealing small door, a blade edge web with an array of elongated holes, a precision-ground sealing blade and a sealing mating surface with the door frame, a main and secondary sealing gasket made of polycrystalline ceramic fiber, and a spring pre-tightening assembly arranged throughout the entire area to form an integrated and synergistic sealing structure. This allows the door to stably maintain a 600mm water column sealing pressure under the alternating high and low temperature operating environment of the carbonization chamber. Compared with conventional coke oven doors, it can significantly suppress the leakage of raw coal gas, meeting the ultra-low emission control requirements of coking production. The staggered elongated holes on the blade edge web rely on their own sliding fit characteristics to offset the component expansion and contraction differences caused by high temperature, disperse the thermal stress generated during operation, and reduce the possibility of local warping failure of the sealing blade. The sealing fit can remain stable during long-term operation. The sharp corners of the sealing blade and the sealing surface of the door frame are all made of polycrystalline ceramic fiber. High-precision grinding is used to create a continuous line contact seal with low-roughness annular texture, reducing the microscopic leakage gap at the metal mating surface. The ceramic fiber main sealing gasket laid between the furnace door brick and the furnace door body has the material characteristics of high temperature resistance, high resilience, and low compression permanent deformation. Combined with the secondary sealing gasket with a compression thickness of 3mm inside the small furnace door and the sliding plate structure arranged along the stepped sealing surface, it isolates the high-temperature airflow inside the furnace from the direct scouring of the sealing components and simultaneously distributes the local compression load of the elastic pre-tightening component. The furnace door is equipped with two sets of door bolt springs and a top pressure seat with 78 sets of matching guide sleeves evenly distributed along the circumference. The graded elastic pre-tightening structure evenly transmits the compression force to the sealing blade edge, adapting to the small deformation of each component to complete the gap compensation. The entire device is compatible with both top-loading and tamping coke ovens, reducing the frequency of equipment maintenance and spare parts consumption while improving the recovery and utilization rate of raw coal gas. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a partial structural diagram of the furnace door body in this invention; Figure 3 This is a schematic diagram of the planar structure of the long waist hole array in this invention; Figure 4 This is a schematic diagram of the left side of the elongated hole array in this invention; Figure 5 This is a schematic diagram of the right side of the long waist hole array in this invention; Figure 6 This is a schematic diagram of the planar structure of the blade-edge web in this invention. Figure 7 This is a side view of the furnace door brick structure in this invention; Figure 8 This is a schematic diagram of the planar structure of the top pressure seat in this invention; Figure 9 This is a cross-sectional view of the small furnace door in this invention; Figure 10 This is a partial structural diagram of the small furnace door in this invention.

[0012] The meanings of the labels in the diagram are as follows: 1. Furnace door body; 2. Small furnace door; 3. Sealing blade edge; 4. Furnace door frame; 5. Long waist hole array; 6. Blade edge web plate; 7. Long hole; 8. Furnace door brick; 9. Door bolt spring; 10. Top pressure seat; 11. Main sealing gasket; 12. Secondary sealing gasket; 13. Slide plate; 14. Top brick groove; 15. Stepped sealing surface. Detailed Implementation

[0013] The technical solutions of this invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0014] Because there is no multi-layered interlocking sealing structure, the high-temperature airflow inside the furnace directly contacts the sealing components. The continuous high-temperature burning will quickly damage the sealing gasket and the contact plate, resulting in persistent leakage points.

[0015] Therefore, in view of the above-mentioned problems, the present invention provides a coke oven door with high sealing performance, with reference to... Figure 1 , Figure 2 , Figure 3 , Figure 7 , Figure 8 , Figure 9 and Figure 10As shown, it includes a furnace door body 1, a sealing blade 3, a furnace door frame 4, a blade web 6, a small furnace door 2, a top brick groove 14, a furnace door brick 8, and a main sealing gasket 11. The top of the furnace door body 1 is provided with a top brick groove 14. The small furnace door 2 is an embedded pressing structure set inside the top brick groove 14. A multi-level stepped sealing surface 15 is provided between the small furnace door 2 and the top brick groove 14. The small furnace door 2 is provided with an elastic pre-tightening component arranged circumferentially on the outside. The elastic pre-tightening component can form a continuous circumferential sealing barrier at the top of the furnace door, eliminating the weak point of flue gas leakage caused by the simple sealing of the traditional small furnace door 2. At the same time, the stepped structure blocks the high-temperature airflow inside the furnace from directly scouring the sealing component, delaying the high-temperature aging failure of the sealing structure and extending the replacement cycle of the sealing components of the small furnace door 2. The blade edge web 6 is provided with an array of elongated holes 5, and multiple elongated holes 7 are provided inside the array of elongated holes 5. The blade edge web 6 slides with the furnace door body 1 through the elongated holes 7 to compensate for the expansion and contraction deformation caused by the furnace door being heated. The arrangement of the elongated holes 5 evenly disperses the thermal stress generated inside the blade edge web 6 under high temperature conditions, avoiding the twisting and deformation of the blade edge web 6, which would cause the sealing blade edge 3 to locally lift or fail to fit. At the same time, it maintains the stability of the sealing contact state during the production process, reducing repeated adjustment operations caused by thermal deformation. The cutting edge of the sealing blade edge 3 and the sealing surface of the furnace door frame 4 form a line contact sealing fit when the furnace door is closed. Relying on the precise metal fitting to seal the micro gap of the mating surface, the overflow channel of raw coal gas is reduced from a physical level, significantly reducing the fugitive emissions of flue gas from the carbonization chamber and meeting the industry's ultra-low emission control requirements. A main sealing gasket 11 is laid between the furnace door brick 8 and the furnace door body 1. The main sealing gasket 11 flexibly fills the assembly gap to form a flexible compensation sealing layer, which adapts to the gap fluctuation caused by the high temperature deformation of each component, continuously fills the assembly gap, and further blocks the gas leakage path. The furnace door is also equipped with a spring pre-tightening assembly, which includes a door bolt spring 9 and multiple top pressure seats 10 distributed circumferentially along the furnace door. The pre-tightening force of the top pressure seats 10 is transmitted and distributed outside the sealing blade edge 3 to drive the cutting edge of the sealing blade edge 3 to press against the sealing surface of the furnace door frame 4. The overall sealing pressure is increased by the uniformly distributed pressing load throughout the entire area, and the sealed environment of the carbonization chamber is stably maintained. While reducing the leakage of flue gas, the wear rate of the sealing components is reduced, and the overall operation and maintenance costs caused by spare parts procurement and shutdown maintenance are reduced.

[0016] refer to Figure 9 and Figure 10As shown, the elastic pre-tightening assembly includes multiple high-temperature resistant disc springs arranged circumferentially along the stepped sealing surface 15. The multi-stage stepped sealing surface 15 is a stepped annular sealing surface with two or more interlocking stages. The multi-stage annular interlocking structure, combined with the surrounding high-temperature resistant disc springs, forms a uniform and continuous pre-tightening constraint force around the small furnace door 2, avoiding insufficient local clamping force and resulting sealing gaps. At the same time, the disc springs themselves have high-temperature resistance characteristics and can maintain elasticity for a long time in the high-temperature environment inside the furnace. The elastic pre-tightening assembly also includes a secondary sealing gasket 12. The thickness of the secondary sealing gasket 12 after compression is 3mm. The secondary sealing gasket 12 with a fixed compression thickness forms a stable flexible sealing buffer layer, compensating for the minor gaps generated during the processing and assembly of the stepped sealing surface 15, and maintaining... To further seal the flue gas infiltration channel, a sliding plate 13 is provided between the secondary sealing gasket 12 and the blade edge web 6. The sliding plate 13 is arranged circumferentially along the stepped sealing surface 15. The sliding plate 13 is a thin metal plate. One side of the sliding plate 13 is attached to the blade edge web 6, and the side of the sliding plate 13 away from the blade edge web 6 is attached to the secondary sealing gasket 12 and the stepped sealing surface 15. The sliding plate 13 slides relative to the secondary sealing gasket 12 to distribute the clamping force of the elastic pre-tightening component and adapt to the high-temperature expansion and contraction deformation of the blade edge web 6. The metal sliding plate 13 disperses the clamping load concentrated by the disc spring, preventing the secondary sealing gasket 12 from being damaged due to excessive local pressure. At the same time, the sliding displacement of the sliding plate 13 adapts to the expansion and contraction deformation of the blade edge web 6 after heating, avoiding the deformation pulling and tearing of the secondary sealing gasket 12.

[0017] refer to Figure 3 - Figure 6 As shown, the blade-edge web 6 is a stainless steel plate structure. Multiple rows of elongated holes 7 are arranged along the height of the furnace door, with each row of holes 7 evenly spaced and staggered between adjacent rows. The major axis of the elongated holes 7 is aligned with the height of the furnace door, and its length is 3 to 8 times the minor axis. The distance between two adjacent elongated holes 7 is 1.2 to 2.0 times the length of the major axis. The stainless steel material is resistant to high-temperature oxidation. Combined with the staggered arrangement and standardized dimensions of the elongated holes 7, it can evenly dissipate the thermal stress accumulated inside the plate at high temperatures, providing sufficient displacement space for the thermal expansion and contraction of the blade-edge web 6, effectively avoiding localized stress. The twisting or warping caused by force concentration is prevented from being damaged in the overall fit of the sealing blade edge 3. The grinding accuracy of the sealing blade edge 3 is ≤0.02mm. The blade edge forms a closed annular precision line sealing blade edge along its entire length. The cross-sectional shape of the blade edge is pointed, and the angle of the pointed angle is 30°~60°. Grinding eliminates the micro-defects of unevenness on the surface of the blade edge. The complete annular pointed blade edge forms a narrow and tight line contact with the furnace door frame 4. The pressure in the contact area is higher, which can fill the tiny gaps in the metal mating surface, reduce the channels for raw coal gas to leak out along the contact surface, and stabilize and improve the overall sealing effect.

[0018] refer to Figure 1 , Figure 7 and Figure 8As shown, the flatness of the sealing surface of the furnace door frame 4 is ≤0.03mm / m, the surface roughness Ra is ≤1.6μm, and the grinding texture of the sealing surface is a continuous annular texture. The low flatness and roughness reduce the fitting gap between the sealing blade edge 3 and the furnace door frame 4. The continuous annular grinding texture can prevent flue gas from penetrating laterally along the contact surface, and together with the sharp blade edge, it forms a complete and continuous metal sealing surface, reducing the gas leakage channel. The main sealing gasket 11 is made of polycrystalline ceramic fiber composite material with an alumina content ≥72%, a temperature resistance ≥1250℃, a compression resilience ≥85%, and a compression permanent deformation rate ≤5%. The thickness of the main sealing gasket 11 is 5mm~15mm, and it is laid on the outside of the furnace door brick 8 and the furnace door body 1. When the furnace door is in operation, it is compressed to 40%~60% of its original thickness. The high alumina ratio enhances the high temperature resistance and thermal corrosion resistance of the main sealing gasket 11. The material's high resilience and low permanent deformation properties allow it to adapt to the gap changes caused by the high temperature deformation of the furnace door over a long period of time. The reasonable working compression range ensures the sealing and filling effect, while preventing rapid aging and pulverization due to excessive compression. Two sets of door bolt springs 9 are set at both ends of the furnace door height direction. 78 sets of top pressure seats 10 are evenly distributed along the circumference of the furnace door. Each set of top pressure seats 10 includes a top pressure spring and a guide sleeve. The preload of the top pressure spring is 200N~500N. The door bolt springs 9 arranged at both ends, together with the top pressure seats 10, evenly transmit the stable and controllable preload to the entire sealing blade edge 3. The guide sleeve constrains the spring's running trajectory to avoid deviation and loss of force. The balanced clamping force can eliminate the defect of insufficient local clamping.

[0019] refer to Figure 1 , Figure 9 and Figure 10 As shown, the stepped sealing surface 15 of the small furnace door 2 isolates the sealing blade 3 and the blade web 6 from the high-temperature airflow inside the furnace when the furnace door is in operation. The auxiliary sealing element in the elastic pre-tightening assembly forms an elastic compensation layer outside the stepped sealing surface 15. The stepped sealing surface 15 blocks the high-temperature airflow from directly impacting the sealing and key stress components, reducing the aging loss caused by high-temperature heat radiation and airflow scouring. The outer elastic compensation layer can adapt to the gap fluctuations caused by the thermal deformation of the components and continuously fill the tiny gaps. The embedded stepped sealing structure of the small furnace door 2, together with the elastic pre-tightening assembly, the elongated hole 7 structure of the blade web 6, the grinding mating surface of the sealing blade 3 and the furnace door frame 4, the secondary sealing gasket 12, and the spring pre-tightening assembly, constitute a quadruple sealing system, which keeps the furnace door sealing pressure stable at 600 mm water column under the high-temperature alternating conditions of the coke oven carbonization chamber. The entire structure can achieve multi-layer progressive sealing, and relies on the elongated hole 7 structure of the blade web 6 to dissipate thermal stress and ensure the stability of the structural shape and position, maintaining a stable sealing pressure threshold under the alternating high-temperature environment of frequent temperature rise and fall.

[0020] Working principle of the invention: When the furnace door is closed, the door bolt spring 9 and the top pressure seat 10 work simultaneously. The guide sleeve in the top pressure seat 10 constrains the running trajectory of the spring. Each set of springs will output a preload force of 200N to 500N. The force is transmitted to the sealing blade edge 3 through the furnace door body 1, driving the blade edge to move towards the sealing surface of the furnace door frame 4 and press it down at the same time.

[0021] After the coke oven carbonization chamber is put into production, the temperature inside the furnace gradually increases. The blade edge web plate 6 is heated and undergoes thermal expansion. The blade edge web plate 6 slides relative to the furnace door body 1 through the external elongated hole 7. The structure of the elongated hole 7 also plays the role of uniformly dispersing thermal stress and reducing the torsional deformation of the blade edge web plate 6 caused by the temperature gradient.

[0022] The sealing blade edge 3 is ground and, driven by pre-tightening force, the pointed blade edge forms a narrow annular line contact with the sealing surface of the furnace door frame 4. The sealing effect is achieved by blocking the micro gaps through the adhesion of the metal surface.

[0023] The small furnace door 2 at the top of the furnace door is installed in the top brick groove 14 with an embedded structure. During the operation of the furnace door, the stepped sealing surface 15 separates the sealing blade edge 3 and the blade edge web plate 6 from the high-temperature airflow inside the furnace, reducing the impact of heat radiation on the sealing components. The secondary sealing gasket 12 in the elastic pre-tightening assembly has a thickness of 3mm after compression, which fills the tiny gaps generated during the processing and assembly of the stepped sealing surface 15. The sliding plate 13 and the secondary sealing gasket 12 will slide relative to each other to disperse the concentrated clamping force of the disc spring and to accommodate the expansion and contraction displacement of the blade edge web plate 6 after heating.

[0024] The main sealing gasket 11 is made of polycrystalline ceramic fiber composite material. Relying on the flexibility and resilience of the material itself, the main sealing gasket 11 fills the assembly gap between the furnace door brick 8 and the furnace door body 1, forming a compensating sealing layer to adapt to the dimensional changes of each component under high temperature conditions.

[0025] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-sealing coke oven door, comprising a door body (1), a sealing blade (3), a door frame (4), a blade web (6), a small door (2), a top brick groove (14), door bricks (8), and a main sealing gasket (11), characterized in that: The top of the furnace door body (1) is provided with a top brick groove (14), and the small furnace door (2) is an embedded pressing structure set inside the top brick groove (14). A multi-level stepped sealing surface (15) is provided between the small furnace door (2) and the top brick groove (14), and an elastic pre-tightening component is provided on the outside of the small furnace door (2) along the circumferential direction. The blade edge web (6) is provided with an array of long waist holes (5), and the long waist hole array (5) is provided with multiple long holes (7). The blade edge web (6) slides with the furnace door body (1) through the long holes (7) to compensate for the expansion and contraction deformation of the furnace door caused by heat. The cutting edge of the sealing blade (3) and the sealing surface of the furnace door frame (4) form a line contact sealing fit when the furnace door is closed; A main sealing gasket (11) is laid between the furnace door brick (8) and the furnace door body (1). The furnace door is also provided with a spring preload assembly, which includes a door bolt spring (9) and multiple top pressure seats (10) spaced apart along the circumference of the furnace door. The preload force of the top pressure seats (10) is transmitted and distributed outside the sealing blade edge (3) to drive the cutting edge of the sealing blade edge (3) to press against the sealing surface of the furnace door frame (4).

2. The high-sealing coke oven door according to claim 1, characterized in that: The elastic preload assembly includes multiple high-temperature resistant disc springs arranged circumferentially along the stepped sealing surface (15), and the multi-stage stepped sealing surface (15) is a stepped annular sealing surface with two or more stages that interlock with each other.

3. The high-sealing coke oven door according to claim 2, characterized in that: The elastic pre-tightening assembly is also embedded with a secondary sealing gasket (12). The thickness of the secondary sealing gasket (12) after compression is 3mm. A sliding plate (13) is provided between the secondary sealing gasket (12) and the blade edge web (6). The sliding plate (13) is arranged circumferentially along the stepped sealing surface (15). The sliding plate (13) is a thin metal plate. One side of the sliding plate (13) is attached to the blade edge web (6). The side of the sliding plate (13) away from the blade edge web (6) is attached to the secondary sealing gasket (12) and the stepped sealing surface (15). The sliding plate (13) generates a sliding displacement relative to the secondary sealing gasket (12) to distribute the clamping force of the elastic pre-tightening assembly and adapt to the high-temperature expansion and contraction deformation of the blade edge web (6).

4. A high-sealing coke oven door according to claim 1, characterized in that: The blade edge web (6) is a stainless steel plate structure. The elongated holes (7) are arranged in multiple rows along the height direction of the furnace door. Each row of elongated holes (7) is evenly spaced, and adjacent rows of elongated holes (7) are staggered. The long axis of the elongated holes (7) is consistent with the height direction of the furnace door. The length of the long axis is 3 to 8 times the length of the short axis. The distance between two adjacent elongated holes (7) is 1.2 to 2.0 times the length of the long axis.

5. A high-sealing coke oven door according to claim 1, characterized in that: The cutting edge grinding accuracy of the sealing blade edge (3) is ≤0.02mm. The cutting edge forms a closed annular precision line sealing cutting edge over its entire length. The cross-sectional shape of the cutting edge is a pointed angle, and the pointed angle of the pointed angle is 30° to 60°.

6. A high-sealing coke oven door according to claim 1, characterized in that: The flatness of the sealing surface of the furnace door frame (4) is ≤0.03mm / m, the surface roughness Ra is ≤1.6μm, and the grinding texture direction of the sealing surface is a continuous annular texture.

7. A high-sealing coke oven door according to claim 6, characterized in that: The main sealing gasket (11) is made of polycrystalline ceramic fiber composite material with an alumina content of ≥72%, a temperature resistance of ≥1250℃, a compression resilience of ≥85%, and a compression permanent deformation rate of ≤5%. The thickness of the main sealing gasket (11) is 5mm to 15mm. It is laid on the outside of the furnace door brick (8) and the furnace door body (1) and is compressed to 40% to 60% of its original thickness when the furnace door is in operation.

8. A high-sealing coke oven door according to claim 1, characterized in that: The door bolt spring (9) is provided in two sets, which are respectively provided at both ends of the furnace door height direction. The top pressure seat (10) is provided in 78 sets evenly distributed along the circumference of the furnace door. Each set of the top pressure seat (10) includes a top pressure spring and a guide sleeve. The preload of the top pressure spring is 200N to 500N.

9. A high-sealing coke oven door according to claim 2, characterized in that: The stepped sealing surface (15) of the small furnace door (2) isolates the sealing blade (3) and the blade web (6) from the high-temperature airflow inside the furnace when the furnace door is in operation. The auxiliary sealing element in the elastic pre-tightening assembly forms an elastic compensation layer outside the stepped sealing surface (15).

10. A high-sealing coke oven door according to claim 1, characterized in that: The embedded stepped sealing structure of the small furnace door (2), together with the elastic pre-tightening component, the elongated hole (7) structure of the blade edge web plate (6), the grinding mating surface of the sealing blade edge (3) and the furnace door frame (4), the secondary sealing gasket (12) and the spring pre-tightening component, constitute a quadruple sealing system, which keeps the furnace door sealing pressure stable at 600 mm water column under the high temperature alternating working conditions of the coke oven carbonization chamber.

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