A composite energy-saving furnace cover for coking ovens

Abstract

This utility model relates to the field of coking oven technology. More specifically, this utility model relates to a composite energy-saving furnace cover for coking ovens, comprising: a furnace cover body, the furnace cover body having an independent heat insulation cavity and a vacuum cavity inside, the inner wall of the heat insulation cavity being coated with a nano-heat insulation coating; a heat insulation layer filling the heat insulation cavity; and a vacuum pumping assembly disposed within the furnace cover body and connecting the heat insulation cavity and the vacuum cavity. The composite energy-saving furnace cover of this utility model has an internal heat insulation cavity, which is evacuated by the vacuum pumping assembly. The vacuum in the heat insulation cavity blocks heat conduction within the furnace cover body, and the heat insulation layer filling the heat insulation cavity further reduces heat conduction between the upper and lower cover bodies. This significantly reduces heat conduction within the furnace cover body, thereby lowering the surface temperature of the upper part of the furnace cover. During the coking cycle of the coking oven, the surface temperature of the furnace cover is reduced by more than 150°C, reducing heat loss of the furnace cover by more than 50%, resulting in good economic and environmental benefits.

Description

Technical Field

[0001] This utility model relates to the field of coking oven technology. More specifically, this utility model relates to a composite energy-saving furnace cover for a coking oven. Background Technology

[0002] Coking ovens are key equipment for refining coke, producing coke through the dry distillation of coking coal under air-isolated conditions. Currently, the commonly used top-charging coking ovens require frequent opening of the oven cover during the coal charging process, an operation typically handled by the automatic cover-opening mechanism of the top-charging coking oven charging car. However, existing top-charging coking oven covers present several technical problems that urgently need to be addressed. Traditional covers are mostly made of cast iron, and during the 18-24 hour coking cycle, the surface temperature of the cover remains consistently above 300°C. This not only causes significant heat loss but also raises the ambient temperature around the cover to over 50°C, creating a harsh high-temperature working environment that greatly increases the risk of burns to operators. More seriously, the existing covers lack sufficient sealing performance, making it difficult to maintain a good seal under high-temperature conditions. This allows raw coal gas generated in the carbonization chamber to leak out through gaps around the cover. This leaked raw coal gas contains numerous harmful components, posing a serious threat to the respiratory system of operators, causing environmental pollution, and also presents flammable and explosive safety hazards. Furthermore, the heat radiation from the high-temperature furnace cover accelerates metal fatigue in surrounding equipment, shortening its service life. These technical defects severely restrict the improvement of energy efficiency and safe production in coking ovens, necessitating the development of new energy-saving furnace cover structures to address these issues. Utility Model Content

[0003] The purpose of this invention is to provide a composite energy-saving furnace cover that can reduce the surface temperature of the furnace cover and reduce heat loss from the furnace cover. When applied to a coking oven, it can effectively reduce the heat loss of the furnace cover.

[0004] To achieve these objectives and other advantages according to the present invention, a composite energy-saving furnace cover for a coking oven is provided, comprising: The furnace cover body has an independent heat insulation cavity and a vacuum cavity inside, and the inner wall of the heat insulation cavity is coated with a nano heat insulation coating. A heat insulation layer that fills the heat insulation cavity; A vacuum assembly is disposed within the furnace cover body and connects the heat insulation cavity and the vacuum cavity.

[0005] Furthermore, in the composite energy-saving furnace cover for coking ovens, the heat insulation layer has a multi-layer structure, and a heat insulation plate is provided between two adjacent heat insulation layers. The two sides of the heat insulation plate that contact the heat insulation layer are both mirror-reflective structures.

[0006] Furthermore, in the composite energy-saving furnace cover for a coking oven, the bottom of the furnace cover body is mirror-polished.

[0007] Furthermore, in the composite energy-saving furnace cover for coking ovens, the top of the furnace cover body is provided with multiple annular grooves to form an annular fin structure.

[0008] Furthermore, in the composite energy-saving furnace cover for a coking oven, the bottom wall of the vacuum chamber is provided with a refractory mud layer.

[0009] Furthermore, in the aforementioned composite energy-saving furnace cover for a coking oven, the furnace cover body comprises: The upper cover has an upper groove at its bottom; The lower cover has a lower groove at its top, the vacuum chamber is located below the lower groove, the vacuum pumping assembly is located on the bottom wall of the lower groove, and the bottom wall of the lower groove has a connection port, through which the vacuum pumping assembly communicates with the vacuum chamber; The bottom of the upper cover and the top of the lower cover are detachably connected, and the upper and lower grooves constitute the heat insulation cavity.

[0010] Furthermore, in the aforementioned composite energy-saving furnace cover for a coking oven, the furnace cover body further includes: A first heat-insulating gasket is disposed between the upper cover and the lower cover; A connecting component is provided, through which the upper cover and the lower cover are detachably connected.

[0011] Furthermore, in the aforementioned composite energy-saving furnace cover for a coking oven, the connecting assembly includes: Multiple fastening screws have their nuts coated with heat-insulating material. The top of the lower cover has threaded holes corresponding to the number of fastening screws. The upper cover has multiple screw slots that are equal in number and correspond one-to-one with the threaded holes. The screw slots and the corresponding threaded holes form a space for installing the fastening screws. The fastening screws pass through the first heat-insulating washer, and their screw threads are installed in the threaded holes. The gap between the fastening screws and the screw slots is filled with heat-insulating material, and a second heat-insulating washer is provided between the nuts and the bottom wall of the screw slots.

[0012] This utility model also provides a coking oven, including a coking oven body, wherein the top of the coking oven body is provided with the composite energy-saving oven cover described in any of the above-mentioned claims.

[0013] The beneficial effects of this utility model are: 1. The composite energy-saving furnace cover of this utility model has an internal heat insulation cavity, which is evacuated by a vacuum pumping assembly. The vacuum cavity blocks heat conduction between the upper and lower cover bodies. Furthermore, the heat insulation cavity is filled with an insulation layer, which further reduces heat conduction between the upper and lower cover bodies. Compared to traditional solid furnace covers, this significantly reduces heat conduction from the lower end to the upper end of the cover, thereby lowering the surface temperature of the upper end. When applied to coking ovens, the composite energy-saving furnace cover reduces the surface temperature of the cover by more than 150°C during the coking cycle compared to a traditional solid furnace cover of the same size, reducing heat loss by more than 50%, resulting in significant economic and environmental benefits. 2. The composite energy-saving furnace cover of this utility model is equipped with a heat insulation cavity and a vacuum cavity inside, which can reduce the weight of the furnace cover. Compared with the traditional solid furnace cover of the same size, the overall weight is reduced by more than 25%, which can reduce the burden on the automatic opening mechanism of the coke oven charging car and extend the service life of the automatic opening mechanism of the coke oven charging car.

[0014] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the composite energy-saving furnace cover described in this utility model; Figure 2 This is a side view of the composite energy-saving furnace cover described in this utility model; Figure 3 This is a cross-sectional view of the composite energy-saving furnace cover described in this utility model; Figure 4 for Figure 3 Detailed view of point A in the middle.

[0016] The attached figures are labeled as follows: Upper cover 1; lower cover 2; heat insulation cavity 3; vacuum cavity 4; heat insulation layer 5; vacuum pumping assembly 6; annular fin structure 7; refractory mud layer 8; first heat insulation gasket 9; fastening screw 10; heat insulation material 11; second heat insulation gasket 12; central cone sleeve 13. Detailed Implementation

[0017] The present invention will now be described in detail and completely with reference to the accompanying drawings. Those skilled in the art will be able to implement the present invention based on these descriptions. Before describing the present invention with reference to the accompanying drawings, it should be particularly noted that the technical solutions and features provided in the various parts of the present invention, including the following description, can be combined with each other without conflict.

[0018] Furthermore, the embodiments of the present invention described below are generally only a part of the embodiments of the present invention, and not all of the embodiments. Therefore, based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without inventive effort should fall within the protection scope of the present invention.

[0019] like Figures 1-4 As shown, an embodiment of this utility model provides a composite energy-saving furnace cover for a coking oven, comprising: The furnace cover body has an independent heat insulation cavity 3 and a vacuum cavity 4 inside. The inner wall of the heat insulation cavity 3 is coated with a nano heat insulation coating. The heat insulation layer 5 fills the heat insulation cavity 3; The vacuum assembly 6 is disposed within the furnace cover body and connects the heat insulation cavity 3 and the vacuum cavity 4.

[0020] In this embodiment, the furnace cover body can be made of cast iron, stainless steel, or heat-resistant alloy materials, with cast iron being generally sufficient. The nano-insulation coating of the insulation cavity 3 can be made of zirconium oxide, silicon carbide, or boron nitride nanomaterials, with the coating thickness controlled within the range of 0.1-0.5 mm. The insulation layer 5 can be made of aluminum silicate fiber, aerogel, or vacuum insulation board material, with a filling density maintained at 200-400 kg / m³. The vacuum assembly 6 can use existing technology, generally including a vacuum pump interface and a sealing valve. In this embodiment, the double insulation structure of the vacuum cavity 4 and the insulation cavity 3, combined with the radiative heat reflection characteristics of the nano-coating, effectively blocks the transfer of heat from the furnace to the outside. The vacuum assembly 6 can maintain a stable low-pressure state in the vacuum cavity 4, reducing gas convection heat conduction. Specifically, the insulation cavity 3 is evacuated by the vacuum assembly 6. The vacuum insulation cavity 3 blocks heat conduction between the upper and lower parts of the furnace cover body. Furthermore, the insulation cavity 3 is filled with an insulation layer 5, which further reduces heat conduction between the upper and lower parts of the furnace cover body. Compared to a traditional solid furnace cover, this significantly reduces heat conduction from the lower end to the upper end, thereby lowering the surface temperature of the upper end of the furnace cover. When the composite energy-saving furnace cover is applied to a coking oven, compared to a traditional solid furnace cover of the same size, the surface temperature of the furnace cover is reduced by more than 150°C during the coking cycle, reducing heat loss by more than 50%. This demonstrates good economic and environmental benefits and is worthy of promotion. In addition, the composite energy-saving furnace cover of this embodiment has an insulation cavity 3 and a vacuum cavity 4 inside, which reduces the weight of the furnace cover. Compared to a traditional solid furnace cover of the same size, the overall weight is reduced by more than 25%, reducing the burden on the automatic opening mechanism of the coking oven charging car and extending its service life.

[0021] Preferably, in another embodiment of the present invention, the heat insulation layer 5 has a multi-layer structure, and a heat insulation plate is provided between two adjacent heat insulation layers 5, and both sides of the heat insulation plate in contact with the heat insulation layer have a mirror reflective structure.

[0022] In this embodiment, the multi-layer insulation structure effectively reduces heat conduction efficiency by arranging insulation materials 11 of different materials in layers. The insulation plate between adjacent insulation layers 5 can be made of metal, with its ends mirror-polished to form a reflective surface, which can reflect radiant heat back into the insulation cavity 3. As a preferred embodiment, the insulation plate can be made of stainless steel sheet with a thickness controlled in the range of 0.5-2mm and a surface roughness Ra≤0.8μm. The mirror reflective structure is achieved through vacuum coating or mechanical polishing, and the reflectivity can reach more than 85%. The insulation layer 5 can be made of different insulation materials 11 such as aluminum silicate fiber felt and aerogel felt, which are stacked alternately, and the thickness of each layer can be adjusted between 10-50mm according to the actual working conditions. In this embodiment, the heat insulation performance of the furnace cover is significantly improved through the synergistic effect of the multi-layer insulation structure and mirror reflection. The multi-layer structure effectively blocks the heat conduction path, while the mirror reflective plate blocks the heat radiation transfer. Compared to traditional single-layer insulation structures, this design reduces the temperature of the furnace lid's outer surface by approximately 40-60°C, significantly minimizing heat loss. Simultaneously, the mirror-reflective structure prevents the insulation material 11 from being directly exposed to high-temperature environments, extending its service life.

[0023] Preferably, in another embodiment of the present invention, the bottom of the furnace cover body is mirror polished.

[0024] In this embodiment, mirror polishing refers to processing the metal surface to a mirror finish using mechanical or chemical methods. As a preferred implementation, multi-stage polishing can be performed using diamond polishing paste. First, coarse grinding is done with 400# sandpaper, followed by fine grinding with 800#, 1200#, and 2000# sandpaper, and finally mirror polishing with chromium oxide polishing paste. Alternatively, electrolytic polishing can be used, employing a phosphoric acid-sulfuric acid mixture as the electrolyte to achieve a mirror finish at a specific current density. Mirror polishing significantly reduces the thermal radiation rate of the furnace lid bottom; tests show that the thermal radiation coefficient of the mirror-polished surface can be reduced to below 0.05. Specifically, when the furnace lid is closed, the polished surface reflects most of the thermal radiation back into the furnace chamber, effectively reducing heat loss through the lid. Furthermore, the dense oxide layer formed on the mirror surface prevents high-temperature oxidation and extends the service life of the furnace lid. Compared with the thermal radiation coefficient of 0.7-0.8 on the surface of ordinary cast iron in the existing technology, this technical solution can reduce the surface temperature of the furnace cover by about 40-50℃, while improving the thermal radiation environment around the furnace cover.

[0025] Preferably, as another embodiment of the present invention, the top of the furnace cover body is provided with a plurality of annular grooves to form an annular fin structure 7.

[0026] In this embodiment, the annular groove is formed by milling on the top surface of the furnace cover body through machining. The annular fin structure 7 can be integrally cast with the furnace cover body, or the prefabricated fin ring can be welded to the furnace cover body. The inner wall of the annular groove can be polished to enhance the heat radiation reflection effect. In this embodiment, by setting the annular fin structure 7 on the top of the furnace cover, the heat dissipation area is effectively increased, and the convection diffusion of heat on the surface of the furnace cover is accelerated. The specific geometric parameters of the annular groove design ensure both structural strength and optimized heat exchange efficiency. Compared with the planar structure of cast iron furnace covers in the prior art, this structure can reduce the surface temperature of the furnace cover by about 80-120°C, significantly improving the safety of the operating environment. At the same time, the rapid heat dissipation characteristics of the annular fin structure 7 reduce the radiation of heat to the surrounding environment of the furnace cover, lowering the ambient temperature of the working area. This structural design also avoids the problem of furnace cover deformation caused by thermal stress concentration, which helps to maintain the sealing performance between the furnace cover and the furnace body.

[0027] Preferably, in another embodiment of the present invention, the bottom wall of the vacuum chamber 4 is provided with a refractory mud layer 8.

[0028] In this embodiment, the refractory mortar layer 8 is made of refractory material, specifically aluminosilicate refractory mortar or high-alumina refractory mortar. The refractory mortar layer 8 is fixed to the bottom wall of the vacuum chamber 4 by coating or spraying, with a thickness controlled within the range of 5-15 mm. As a preferred embodiment, a metal mesh layer can be added between the refractory mortar layer 8 and the bottom wall of the vacuum chamber 4 to enhance the bonding strength. The surface of the refractory mortar layer 8 can be smoothed to ensure a tight fit with the bottom wall of the vacuum chamber 4. The refractory mortar layer 8 maintains structural stability under high-temperature conditions, with a thermal conductivity of less than 0.5 W / (m·K). The refractory mortar layer 8 effectively blocks the conduction of high-temperature heat radiation to the furnace cover body after being installed on the bottom wall of the vacuum chamber 4. The low thermal conductivity of the refractory mortar layer 8 reduces heat transfer through the bottom wall of the vacuum chamber 4 to other parts of the furnace cover. Simultaneously, the refractory mortar layer 8 can withstand the operating temperature of the coking oven, preventing deformation of the bottom wall of the vacuum chamber 4 due to high temperatures. Compared to the design without the refractory mortar layer 8, this structure improves the overall thermal insulation performance of the furnace cover by approximately 15%, and reduces the outer surface temperature of the furnace cover by 20-30°C. The refractory mortar layer 8 also extends the service life of the vacuum chamber 4 structure and reduces metal fatigue caused by high temperatures.

[0029] Preferably, in another embodiment of this utility model, the furnace cover body includes: The upper cover 1 has an upper groove at its bottom; The lower cover 2 has a lower groove at its top. The vacuum chamber 4 is located below the lower groove. The vacuum pumping assembly 6 is located on the bottom wall of the lower groove. The bottom wall of the lower groove has a connection port. The vacuum pumping assembly 6 communicates with the vacuum chamber 4 through the connection port. The bottom of the upper cover 1 and the top of the lower cover 2 are detachably connected, and the upper and lower grooves constitute the heat insulation cavity 3.

[0030] In this embodiment, the furnace cover body adopts a split design of upper cover 1 and lower cover 2, which facilitates manufacturing and maintenance. The upper and lower covers cooperate to form a heat insulation cavity 3, which helps to improve the heat insulation effect. The vacuum assembly 6 is connected to the vacuum cavity 4 through a connection port, which facilitates the vacuuming operation of the vacuum cavity 4. The detachable connection method can adopt bolt connection, snap connection or other mechanical connection method, which facilitates disassembly and maintenance. In this embodiment, the split design makes the manufacturing and maintenance of the furnace cover body more convenient. The heat insulation cavity 3 structure formed by the upper and lower covers, together with the setting of the vacuum cavity 4, effectively improves the heat insulation effect. The vacuum assembly 6 is reasonably positioned, which facilitates operation and maintenance. This solution solves the problems of complex overall structure and difficult maintenance of the furnace cover in the prior art, while improving heat insulation performance and ease of operation.

[0031] Preferably, in another embodiment of the present invention, the furnace cover body further includes: The first heat insulation gasket 9 is disposed between the upper cover 1 and the lower cover 2; The upper cover 1 and the lower cover 2 are detachably connected via the connecting component.

[0032] In this embodiment, the first heat-insulating gasket 9 can be made of high-temperature resistant ceramic fiber material, with a thickness ranging from 5-15 mm, preferably 10 mm. This gasket can be designed as a ring structure, with its inner diameter matching the outer diameter of the heat insulation cavity 3, and its outer diameter slightly larger than the contact surface diameter between the upper cover 1 and the lower cover 2. The first heat-insulating gasket 9 can have a multi-layer structure, with each layer bonded together using a high-temperature resistant adhesive. In this embodiment, by setting the first heat-insulating gasket 9, the heat conduction path between the upper cover 1 and the lower cover 2 can be effectively blocked. Simultaneously, the detachable connection facilitates maintenance and repair of the internal structure of the furnace cover. This technical solution solves the problem of heat energy waste caused by the integral casting of traditional cast iron furnace covers, reduces maintenance difficulty through modular design, and ensures the sealing performance of the furnace cover.

[0033] Preferably, in another embodiment of the present invention, the connecting component includes: Multiple fastening screws 10, the top of which is coated with heat-insulating material 11, the lower half of the screw shank of the fastening screw 10 is threaded, and the upper half is not threaded.

[0034] The lower cover 2 has a number of threaded holes corresponding to the number of fastening screws 10 on its top. The upper cover 1 has a number of screw slots that are equal to and correspond one-to-one with the number of threaded holes. The screw slots and the corresponding threaded holes form a space for installing the fastening screws 10. The fastening screws 10 pass through the first heat-insulating washer 9, and the threaded portion of their shanks is threaded into the threaded holes, with their nuts abutting against the bottom wall of the screw slots. The gap between the shank of the fastening screw 10 and the screw slot is filled with heat-insulating material 11, and a second heat-insulating washer 12 is provided between the nut and the screw slot.

[0035] In this embodiment, the gap between the screw and the screw groove of the fastening screw 10 is filled with heat-insulating material 11, and a second heat-insulating washer 12 is provided between the nut and the bottom wall of the screw groove. The heat-insulating material 11 can be ceramic fiber or high-temperature resistant silicone, and the second heat-insulating washer 12 is preferably a graphite washer or a mica washer. During installation, a pre-tightening force ensures a tight fit with the nut and the bottom wall of the screw groove. As a preferred embodiment, the heat-insulating material 11 sprayed on the top of the nut of the fastening screw 10 is an alumina coating. The depth of the screw groove is 1-2 mm greater than the height of the nut to allow for compression space for the second heat-insulating washer 12. In this embodiment, by employing a multi-layer heat-insulating design in the connecting assembly, the heat conduction path is effectively blocked while ensuring a reliable connection between the upper cover 1 and the lower cover 2. The contact surfaces between the fastening screw 10 and the metal parts are all provided with heat-insulating material 11 or washers, significantly reducing the heat conducted through the connecting parts. Compared to traditional direct metal connections, this structure reduces the outer surface temperature of the furnace cover by approximately 40%, improving operational safety and reducing heat loss. In practice, all fastening screws 10 should be tightened evenly in three stages along a diagonal sequence to ensure uniform compression of the first insulating washer 9 and the second insulating washer 12.

[0036] An embodiment of this utility model also provides a coking oven, including a coking oven body, the top of which is provided with the aforementioned composite energy-saving oven cover.

[0037] In this embodiment, the composite energy-saving furnace cover includes a furnace cover body, inside which there are independent heat insulation cavities 3 and vacuum cavities 4. The inner wall of the heat insulation cavity 3 is coated with a nano heat insulation coating. The heat insulation layer 5 fills the heat insulation cavity 3, and the vacuum pumping component 6 is disposed in the furnace cover body and connects the heat insulation cavity 3 and the vacuum cavity 4. The heat insulation layer 5 has a multi-layer structure, with heat insulation plates between adjacent heat insulation layers 5, and both ends of the heat insulation plates have a mirror reflective structure. The bottom of the furnace cover body is mirror polished, and the top has multiple annular grooves to form an annular fin structure 7. The bottom wall of the vacuum cavity 4 is provided with a refractory mud layer 8. The furnace cover body is composed of an upper cover 1 and a lower cover 2. The bottom of the upper cover 1 has an upper groove, and the top of the lower cover 2 has a lower groove. The vacuum cavity 4 is disposed below the lower groove, and the vacuum pumping component 6 is disposed on the bottom wall of the lower groove and communicates with the vacuum cavity 4 through a connection port. The upper cover 1 and the lower cover 2 are detachably connected, and the upper groove and the lower groove constitute the heat insulation cavity 3. The first heat insulation washer 9 is disposed between the upper cover 1 and the lower cover 2. The connecting assembly includes multiple fastening screws 10. The top of the nut of the fastening screw 10 is coated with heat insulation material 11. The gap between the screw and the screw groove is filled with heat insulation material 11. A second heat insulation washer 12 is provided between the nut and the screw groove.

[0038] The composite energy-saving furnace cover effectively reduces the surface temperature of the furnace cover through a dual insulation structure of vacuum chamber 4 and insulation chamber 3. Vacuum chamber 4 is maintained in a vacuum state by vacuum pumping component 6 to block heat conduction, while the multi-layer insulation structure and mirror-reflective structure within insulation chamber 3 reflect heat radiation. The mirror-polished bottom of the furnace cover body and the annular fin structure 7 at the top enhance heat reflection and heat dissipation capabilities, respectively. The refractory mortar layer 8 improves the high-temperature resistance of vacuum chamber 4. The detachable connection structure of the upper cover 1 and lower cover 2 facilitates maintenance and replacement of internal components, and the first and second insulation gaskets 9 and 12 further reduce the heat conduction path. The heat-insulating treatment and gap filling of the fastening screws 10 effectively block the thermal bridging effect at the screw locations. By adopting the composite energy-saving furnace cover, the coking oven significantly reduces the surface temperature of the furnace cover and surrounding heat radiation, improving the safety of the operating environment. The dual vacuum and insulation structure effectively reduces heat waste, while the mirror-reflective treatment and annular fin structure 7 optimize thermal management performance. The detachable connection design and multi-layer thermal insulation ensure the reliability and ease of maintenance of the device, solving the problems of high temperature and poor sealing of traditional cast iron furnace covers.

[0039] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and embodiments shown and described herein.

Claims

1. A composite energy saving cover for coke ovens, characterized in that, include: The furnace cover body has an independent heat insulation cavity and a vacuum cavity inside, and the inner wall of the heat insulation cavity is coated with a nano heat insulation coating. A heat insulation layer that fills the heat insulation cavity; A vacuum assembly is disposed within the furnace cover body and connects the heat insulation cavity and the vacuum cavity.

2. A composite energy saving cover for coke ovens as claimed in claim 1, wherein, The heat insulation layer has a multi-layer structure, and a heat insulation board is provided between two adjacent heat insulation layers. Both sides of the heat insulation board that are in contact with the heat insulation layer have a mirror reflective structure.

3. A composite energy saving cover for coke ovens as claimed in claim 1 wherein, The bottom of the furnace cover body is mirror-polished.

4. A composite energy saving cover for coke ovens as claimed in claim 1 wherein, The top of the furnace cover body is provided with multiple annular grooves to form an annular fin structure.

5. A composite energy saving cover for coke ovens as claimed in claim 1 wherein, The bottom wall of the vacuum chamber is provided with a refractory mud layer.

6. A composite energy saving cover for coke ovens as claimed in claim 1 wherein, The furnace cover body includes: The upper cover has an upper groove at its bottom; The lower cover has a lower groove at its top, the vacuum chamber is located below the lower groove, the vacuum pumping assembly is located on the bottom wall of the lower groove, and the bottom wall of the lower groove has a connection port, through which the vacuum pumping assembly communicates with the vacuum chamber; The bottom of the upper cover and the top of the lower cover are detachably connected, and the upper and lower grooves constitute the heat insulation cavity.

7. A composite energy saving cover for coke ovens as claimed in claim 6 wherein, The furnace cover body also includes: A first heat-insulating gasket is disposed between the upper cover and the lower cover; A connecting component is provided, through which the upper cover and the lower cover are detachably connected.

8. A composite energy saving cover for coke ovens as claimed in claim 7 wherein, The connection component includes: Multiple fastening screws have their nuts coated with heat-insulating material. The top of the lower cover has threaded holes corresponding to the number of fastening screws. The upper cover has multiple screw slots that are equal in number and correspond one-to-one with the threaded holes. The screw slots and the corresponding threaded holes form a space for installing the fastening screws. The fastening screws pass through the first heat-insulating washer, and their screw threads are installed in the threaded holes. The gap between the fastening screws and the screw slots is filled with heat-insulating material, and a second heat-insulating washer is provided between the nuts and the bottom wall of the screw slots.

9. A coke oven comprising a coke oven body, characterized by, The top of the coking furnace body is provided with a composite energy-saving furnace cover as described in any one of claims 1-8.

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