Heat recovery coke oven door

Abstract

This invention discloses a heat recovery coke oven door, comprising an upper door and a lower door. The upper door has an upper door surface heating plate installed on the hot end of the arched brick wall and the bottom brick wall within its shell. A heat-insulating filling layer for the upper door is filled in the cavity formed by the back plate of the upper door shell, the arched brick wall, the bottom brick wall, and the upper door surface heating plate. Similarly, a lower door surface heating plate is installed on the hot end of the frame-shaped brick wall of the lower door shell. A heat-insulating filling layer for the lower door is also filled in the cavity formed by the back plate of the lower door shell, the frame-shaped brick wall, and the lower door surface heating plate. A door perimeter seal is installed on the outer periphery of the lower door shell. A lintel seal is embedded on the outer wall of the frame-shaped brick wall. A bottom lintel is detachably installed on the lower side of the bottom brick wall. This invention not only has excellent sealing performance, effectively blocking the intake of external air and the leakage of internal heat, but also has extremely high high temperature resistance and thermal shock resistance, greatly improving the fire resistance and heat insulation performance of the furnace door.

Description

Technical Field

[0001] This invention relates to a clean heat recovery coke oven, and more particularly to a door of a clean heat recovery coke oven with high thermal shock resistance and high thermal resistance. Background Technology

[0002] The coke oven door is a crucial component of the coke oven structure. Located on both sides of the carbonization chamber, each door consists of an upper and a lower section. The upper door is fixed, while the lower door is movable. During coking production, the doors serve to insulate, seal, and facilitate coal charging and coke discharging. Because coking is inherently a high-temperature dry distillation process, the carbonization chamber is under high temperatures. Furthermore, the coke oven's carbonization chamber undergoes periodic coal charging and discharging, resulting in significant temperature fluctuations. Combined with the corrosive effects of tar, dust, and flue gas within the carbonization chamber, as well as the impacts from various mechanical equipment, the refractory materials used for the door lining require high-temperature resistance, good thermal shock stability, corrosion resistance, and high surface abrasion resistance.

[0003] During production, the carbonization chamber of a heat recovery coke oven operates under a slight negative pressure. Under this pressure, external air is drawn into the carbonization chamber through the sealing surfaces of the oven doors on both sides. This drawn-in air encounters the raw coal gas within the carbonization chamber near the door sealing surfaces, causing combustion and generating high temperatures in the localized combustion area. In severe cases, this can lead to melting of the door body and other metal structural components such as brick troughs, resulting in production accidents. The upper part of the coke oven door directly faces the combustion space above the carbonization chamber, while the lower part is close to the coal cake in the carbonization chamber, creating an inherent temperature difference between the upper and lower sides of the door. The coke oven door not only has to withstand extremely high coking temperatures but also experiences significant temperature differences between its upper and lower sides and in specific areas. These temperature differences can cause door deformation, exacerbating sealing surface failure and leakage. Therefore, the operating environment of the heat recovery coke oven door is extremely harsh, requiring it to withstand extremely high coking temperatures and experiencing significant temperature differences between its upper and lower sides and in specific areas.

[0004] Traditional heat recovery coke oven doors use heavy castable refractories as the lining. However, the weight of castable doors is unfavorable for coal charging and coke discharging operations. The temperature difference between the upper and lower sides of the door is more likely to generate thermal stress, causing cracks or even collapse of the door lining, resulting in a short service life. Castable linings also have drawbacks such as high thermal conductivity and poor insulation performance. Significant heat loss not only easily leads to low furnace head flue temperatures, resulting in undercooked coke and low coke strength, but also results in the loss of a large amount of energy during the coking process. Furthermore, it leads to high temperatures in the working space, which is detrimental to operation and monitoring during production.

[0005] While the use of refractory bricks improves thermal shock resistance, the furnace door suffers from poor overall integrity, sealing, and wear resistance, and has a high thermal conductivity and density. Furthermore, the refractory bricks contain numerous gaps in the brickwork. Over time, the furnace door, subjected to mechanical and thermal stress, is prone to loosening, leading to widening gaps. This not only causes heat loss through the gaps but also allows high-temperature airflow to melt and damage the furnace door itself and its metal components. Localized damage often necessitates complete removal, which is labor-intensive, time-consuming, and reduces the furnace door's lifespan.

[0006] Although fire-resistant and flame-retardant fibers are used as furnace door linings, they have the advantages of high temperature resistance and light weight. However, they have low mechanical strength and are prone to crystallization, brittleness, shrinkage, or even powdering under long-term high temperature, resulting in a short service life.

[0007] To prevent outside air from being drawn into the carbonization chamber, the doors on both sides of the carbonization chamber in heat recovery coke ovens often employ a sealing structure. Most existing door sealing structures use a "metal-to-metal" knife-edge seal, where the metal components of the coke oven door directly contact the metal door frame to form a seal. However, given the extremely high coking temperatures of heat recovery coke ovens, the knife-edge metal components are easily burned and melted, failing to provide a proper seal. Furthermore, the temperature difference between the doors can easily cause the door frame to bend and deform due to thermal expansion. This bending deformation creates unevenness between the door and the frame, exacerbating the intake of outside air and making it easier to generate localized high temperatures during combustion.

[0008] Therefore, the thermal insulation and sealing performance of heat recovery coke oven doors have always been technical challenges of concern in the industry. Summary of the Invention

[0009] In view of the above-mentioned shortcomings of the existing technology, the technical problem to be solved by the present invention is to provide a heat recovery coke oven door that not only has good sealing performance, effectively blocking the intake of external air and the leakage of internal heat energy, but also has extremely high high temperature resistance, thermal shock resistance and long service life.

[0010] To solve the above-mentioned technical problems, the present invention provides a heat recovery coke oven door, comprising an upper oven door and a lower oven door arranged opposite to each other. The upper oven door includes an upper oven door shell. An arched brick wall and a bottom brick wall are built along the inner circumference of the shell wall of the upper oven door shell in the upper oven door insulation cavity. An upper oven door hot plate is installed on the hot end of the arched brick wall and the bottom brick wall. An upper oven door heat-insulating filling layer is filled in the cavity formed by the back plate of the upper oven door shell, the arched brick wall, the bottom brick wall and the upper oven door hot plate.

[0011] The lower furnace door includes a lower furnace door shell. A frame-shaped brick wall is built along the inner circumference of the shell wall in the lower furnace door insulation cavity of the lower furnace door shell. A lower furnace door hot plate is installed on the hot end of the frame-shaped brick wall. A lower furnace door heat-insulating filling layer is filled in the cavity formed by the back plate of the lower furnace door shell, the frame-shaped brick wall and the lower furnace door hot plate.

[0012] The outer periphery of the shell wall of the lower furnace door is equipped with a door periphery seal; the outer wall surface of the frame-shaped brick wall is embedded with a lintel seal.

[0013] Preferably, a bottom wall lintel is detachably installed on the lower side of the bottom brick wall.

[0014] Preferably, the arched brick wall and the bottom brick wall are installed in the upper furnace door insulation cavity of the upper furnace door shell through the upper furnace door insulation brick and the upper furnace door insulation pad in sequence.

[0015] Preferably, the upper furnace door hot plate is inserted into the insertion slots of the arched brick wall and the bottom brick wall; the upper furnace door hot plate is composed of several panel units, and the door panel gaps between adjacent panel units are filled with high-temperature mortar or ceramic fiber.

[0016] Preferably, the bottom wall lintel extends over the upper furnace door insulation pad and covers the upper furnace door shell, and the upper furnace door insulation pad is laid in the upper furnace door insulation cavity of the upper furnace door shell; the bottom side brick wall and the bottom wall lintel are connected to each other by an insert structure or a locking structure, and the bottom side brick wall and the bottom wall lintel have the same or similar coefficient of thermal expansion.

[0017] Preferably, the upper furnace door hot plate, arch wall locking brick, arch wall pressing brick, bottom wall locking brick, bottom wall pressing brick, and bottom wall lintel are made of zero-expansion silica bricks or low-expansion mullite bricks; the upper furnace door heat-insulating filling layer is filled with ceramic fiber folded blocks; the upper furnace door heat-insulating bricks are made of mullite heat-insulating bricks, high-alumina heat-insulating bricks, or alumina hollow sphere bricks; and the upper furnace door heat-insulating pad is made of nano-ceramic fiber board or nano-ceramic fiber blanket.

[0018] Preferably, the lintel seal is embedded in the mounting groove on the outer wall of the upper brick wall of the frame-shaped brick wall, and the lintel seal is made of ceramic fiber board or ceramic fiber blanket.

[0019] Preferably, the door perimeter seal includes a sealing strip arranged along the outer periphery of the shell wall of the lower furnace door housing, the sealing strip being embedded in a sealing strip support plate, and a plurality of compression springs being supported on the sealing strip support plate.

[0020] Preferably, the lower furnace door hot plate is inserted into the insertion groove on the inner periphery of the frame-shaped brick wall; the lower furnace door hot plate is composed of several panel units, and the door panel gap between adjacent panel units is filled with high-temperature mortar or ceramic fiber.

[0021] Preferably, the frame-shaped brick wall is installed in the lower furnace door insulation cavity of the lower furnace door shell in sequence through the lower furnace door insulation brick and the lower furnace door insulation pad.

[0022] Preferably, a frame wall limiting plate is provided between the heat insulation bricks of the lower furnace door and the heat-insulating filling layer of the lower furnace door; the frame-shaped brick wall is constructed by sequentially laying frame wall facing bricks; the frame wall facing bricks are fixedly installed on the lower furnace door shell by lower furnace door anchor bolts.

[0023] Preferably, the frame wall bricks and the lower furnace door hot plate are made of zero-expansion silica bricks or low-expansion mullite; the lower furnace door heat-insulating filling layer is made of ceramic fiber folded blocks; and the lower furnace door heat insulation pad is made of nano-ceramic fiber board or nano-ceramic fiber blanket.

[0024] In this invention, the cavity formed by the upper furnace door hot plate, the arched brick wall, the bottom brick wall, and the upper furnace door shell back plate is filled with a heat-insulating fiber layer. Similarly, the cavity formed by the lower furnace door hot plate, the frame brick wall, and the lower furnace door shell back plate is also filled with a lower heat-insulating fiber layer. On the one hand, the use of a plate structure for the hot plate instead of the traditional brick structure allows for the formation of a larger space for the heat-insulating fiber-filled cavity, thus leveraging the advantages of the refractory insulating ceramic fiber: lightweight, high-temperature resistance, low thermal conductivity, and good thermal stability. On the other hand, the use of an integrally structured fire-facing hot plate effectively blocks the erosion of the furnace door body by the high-temperature flames and gas inside the carbonization chamber, providing effective protection for the refractory insulating ceramic fiber filling layer. This helps overcome the shortcomings of low mechanical strength, high brittleness, and poor resistance to erosion, better utilizing the performance advantages of the heat-insulating filling layer and forming an extremely superior refractory insulating composite structure. The integral hot plate structure also effectively protects the metal body of the furnace door and its metal components. Furthermore, using plate-type heating plates not only reduces the weight of the furnace door but also improves its cost-effectiveness. The heating plates are made of refractory materials with extremely low coefficients of thermal expansion, excellent thermal shock resistance, strong chemical stability, and superior high-temperature performance. This plate structure reduces the relative cost of the furnace door while providing superior vibration and thermal shock resistance. Using plate-type heating plates also facilitates construction and maintenance, shortens maintenance time, and reduces maintenance costs.

[0025] Furthermore, since a perimeter seal is installed on the outer circumference of the lower furnace door shell wall, and a lintel seal is also embedded in the frame brick wall of the lower furnace door, the perimeter seal and the lintel seal constitute two seals with different functions. The lintel seal is located between the refractory insulating bricks of the upper and lower furnace doors, directly resisting and blocking the overflow and infiltration of high-temperature airflow in the coke oven carbonization chamber. The perimeter seal is located between the upper and lower furnace shells, blocking the intrusion of outside air into the furnace, and also preventing the leakage of high-temperature gas in the kiln. The two seals each have their own focus and have the same coordinated function, achieving a comprehensive sealing effect that strictly prevents external leakage and internal intrusion.

[0026] Furthermore, because a bottom wall lintel is detachably installed on the lower side of the bottom brick wall of the upper furnace door, the working environment at the lower side of the bottom brick wall of the upper furnace door is extremely harsh. The lower side of the bottom brick wall corresponds to the combustion space above the carbonization chamber and is also the contact point where the upper and lower furnace doors are closed. The infiltration of external air will generate extremely high combustion temperatures at this location, aggravating its burn-out. After burn-out, more air will enter, resulting in more intense combustion. Replacing the burnt upper furnace door not only seriously affects the production efficiency of the coke oven, but also greatly increases the furnace door maintenance cost. The bottom wall lintel structure not only facilitates quick maintenance of the upper furnace door and ensures stable sealing performance between the upper and lower furnace doors, but also greatly reduces the use and maintenance costs of the furnace door and improves the production efficiency of the coke oven.

[0027] Furthermore, the arched brick walls and bottom brick walls of the upper furnace door, as well as the frame-shaped brick walls of the lower furnace door, are successively installed on the furnace door shell through corresponding heat-insulating bricks and heat-insulating pads, which enhances the resistance to thermal shock and high heat resistance performance. The use of heat-insulating pads also gives the furnace door an ultimate heat insulation effect, greatly reducing the heat loss of the coke oven, protecting the metal shell of the furnace door, and extending its service life. Attached Figure Description

[0028] The heat recovery coke oven door of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] Figure 1 This is a front view of the outer side of a specific embodiment of the heat recovery coke oven door of the present invention;

[0030] Figure 2 yes Figure 1 Cross-sectional view of line A-A;

[0031] Figure 3 yes Figure 1 Frontal structural diagram of the inner side of the upper and middle furnace doors;

[0032] Figure 4 yes Figure 3 Left sectional view;

[0033] Figure 5 yes Figure 3 B-B cross-section view;

[0034] Figure 6 yes Figure 3 Structural diagram of the upper and middle furnace door shell;

[0035] Figure 7 yes Figure 6 Left sectional view;

[0036] Figure 8 yes Figure 3 Assembly structure diagram of the central arched brick wall and the bottom side brick wall;

[0037] Figure 9 yes Figure 8 A schematic diagram of the C-C cross-sectional structure;

[0038] Figure 10 yes Figure 8 Schematic diagram of the D-D cross-sectional structure;

[0039] Figure 11 yes Figure 3 Another implementation diagram of the upper furnace door is shown;

[0040] Figure 12 yes Figure 1 Frontal structural diagram of the inner side of the middle and lower furnace door;

[0041] Figure 13 yes Figure 12 Left sectional view;

[0042] Figure 14 yes Figure 12 E-E cross-section;

[0043] Figure 15 yes Figure 12 Structural diagram of the lower furnace door shell;

[0044] Figure 16 yes Figure 15 Left sectional view;

[0045] Figure 17 yes Figure 13 Cross-sectional view of the central door perimeter seal;

[0046] Figure 18 yes Figure 12 Installation structure diagram of the medium-frame brick wall;

[0047] Figure 19 yes Figure 18 Sectional view of G-G;

[0048] Figure 20 yes Figure 12 The diagram shows a cross-sectional view of another implementation of the furnace door.

[0049] In the diagram: 1—Upper furnace door: 101—Upper furnace door shell, 102—Arched brick wall, 103—Upper furnace door face hot plate, 104—Arch wall locking brick, 105—Arch wall pressing brick, 106—Bottom side brick wall, 107—Bottom wall locking brick, 108—Bottom wall pressing brick, 109—Bottom wall lintel, 110—Upper furnace door anchor bolt, 111—Upper furnace door bolt protective plug, 112—Upper furnace door heat insulation pad, 113—Upper furnace door heat insulation brick, 114—Upper furnace door heat insulation filling layer, 115—Upper furnace door heat insulation cavity, 116—Upper furnace door anchor bolt hole, 117—Upper furnace door face hot plate slot, 118—Upper furnace door brick body bolt hole, 119—Locking brick, 120—Support brick; 2—Lower furnace door: 2 01—Lower furnace door shell, 202—Door perimeter seal, 203—Frame-shaped brick wall, 204—Frame wall facing brick, 205—Lower furnace door facing hot plate, 206—Insertion facing hot plate, 207—Door lintel seal, 208—Lower furnace door insulation pad, 209—Lower furnace door insulation brick, 210—Frame wall limiting plate, 211—Lower furnace door heat-insulating filling layer, 212—Lower furnace door anchor bolt, 213—Lower furnace door bolt protective plug, 214—Lower furnace door insulation cavity, 215—Lower furnace door anchor bolt hole, 216—Lower furnace door brick body bolt hole, 217—Lower furnace door facing hot plate slot, 218—Sealing strip, 219—Sealing strip support plate, 220—Pressure sliding shaft, 221—Pressure spring, 222—Sealing support. Detailed Implementation

[0050] like Figure 1 , Figure 2 The heat recovery coke oven door shown includes an upper door 1 and a lower door 2. The upper door 1 is fixedly installed on the door frame of the heat recovery coke oven, while the lower door 2 is a movable door. It is opened when the coke oven discharges coke and charges coal. When the coke oven is undergoing high-temperature dry distillation, the left, right, and bottom sides of the lower door are pressed against the coke oven door frame, and the upper side of the lower door is in sealed contact with the bottom edge of the upper door. The upper door shell 101 of the upper door 1 and the lower door shell 201 of the lower door 2 are made of high-temperature cast iron or high-temperature cast steel, or other metal materials. Accessories for hoisting and installing the doors are provided on the outer surfaces of the upper door 1 and the lower door 2. The inner surfaces of the upper door 1 and the lower door 2 face the coke oven carbonization chamber. The bottom wall lintel 109 of the upper furnace door 1 is in sealed contact with one side of the frame brick wall 203 of the lower furnace door through the lintel seal 207; the upper furnace door shell 101 is in sealed contact with the lower furnace door shell 201 through the door seal 202.

[0051] like Figure 3 , Figure 4 and Figure 5 As shown, the outer side of the upper furnace door shell 101 of the upper furnace door 1 faces the outside of the coke oven, and the side of the upper furnace door shell 101 facing the inside of the furnace is the upper furnace door insulation cavity 115 with an inward opening. The upper furnace door insulation cavity 115 is formed by the arched shell wall on the upper side and the straight shell wall on the lower side.

[0052] An arched brick wall 102 is built on the inner side of the arched shell wall of the upper furnace door shell 101, and a bottom brick wall 106 is built on the inner side of the straight shell wall of the upper furnace door shell 101. The arched brick wall 102 and the bottom brick wall 106 are respectively fixed to the back plate of the upper furnace door shell 101 by corresponding upper furnace door anchor bolts 110. The upper furnace door anchor bolt 110 adopts a countersunk hole fixing structure, and its screw hole end is filled with an upper furnace door bolt protective plug 111. The upper furnace door bolt protective plug 111 includes a high-temperature mortar section at the outer end and a ceramic fiber filling section at the inner end. The bolt body of the upper furnace door anchor bolt 110 is covered with a nano-ceramic fiber sleeve.

[0053] The inner perimeter of the arched brick wall 102 and the bottom brick wall 106 is provided with interconnected upper furnace door hot plate slots 117, into which upper furnace door hot plates 103 are inserted. The upper furnace door hot plate 103 is composed of seven panel units of varying sizes, with high-temperature mortar or ceramic fiber filling the gaps between adjacent panel units. Besides employing the aforementioned multi-panel unit modular structure, the upper furnace door hot plate 103 can also utilize a single-piece panel structure.

[0054] The arched brick wall 102 and the bottom brick wall 106 are built on the upper furnace door insulating brick 113. The upper furnace door insulating brick 113 is made of mullite insulating brick, or it can be high-alumina insulating brick or alumina hollow spherical brick. Upper furnace door insulating pads 112 are placed between the upper furnace door insulating brick 113 and the shell wall and back plate of the upper furnace door shell 101 corresponding to the arched brick wall 102 and the bottom brick wall 106. The upper furnace door insulating pads 112 are made of zirconium-containing nano-ceramic fiber board or zirconium-containing nano-ceramic fiber felt, or other corresponding alumina, silicon silicide, and silicon nitride nano-ceramics. The upper furnace door hot plate 103, the arched brick wall 102, and the bottom brick wall 106 are made of the same refractory insulating material.

[0055] An upper furnace door heat-insulating filling layer 114 is filled in the arc-shaped cavity formed by the arched brick wall 102, the bottom side brick wall 106, the upper furnace door hot plate 103, and the back plate of the upper furnace door shell 101. This upper furnace door heat-insulating filling layer 114 is made of ceramic fiber folded blocks, or it can be made of other high-temperature resistant ceramic fiber materials such as ceramic fiber blankets. This ceramic fiber material located in the arc-shaped cavity not only takes advantage of its advantages of being lightweight, high-temperature resistant, low thermal conductivity, and high thermal stability, but also avoids the limitations of its insufficient physical and mechanical properties.

[0056] like Figure 6 and Figure 7As shown, the upper furnace door shell 101 is made of high-temperature cast iron or high-temperature cast steel. The arched shell wall, the straight shell wall and the back plate of the upper furnace door shell 101 form an arched groove-shaped upper furnace door insulation cavity 115. Several upper furnace door anchor bolt holes 116 are provided on the back plate of the upper furnace door shell 101 at positions corresponding to the arched brick wall 102 and the bottom brick wall 106. These upper furnace door anchor bolt holes 116 are used to install upper furnace door anchor bolts 110.

[0057] like Figure 8 As shown, the bottom brick wall 106 is constructed by alternating bottom wall locking bricks 107 and bottom side pressing bricks 108, which interlock with each other using stepped surfaces (see...). Figure 5 The bottom wall locking brick 107 and the bottom side pressing brick 108 are respectively provided with interlocking tenons and mortises. The upper furnace door anchor bolts 110 pass through the bottom wall locking brick 107, the upper furnace door heat insulation brick 113 and the upper furnace door heat insulation pad 112 in sequence and are locked and fixed to the back plate of the upper furnace door shell 101.

[0058] Correspondingly, the arched brick wall 102 is constructed by alternating arched locking bricks 104 and arched pressing bricks 105. The arched locking bricks 104 are fixedly installed on the upper furnace door shell 101 by the upper furnace door anchor bolts 110, while the arched pressing bricks 105 are pressed onto the upper furnace door shell 101 by the arched locking bricks 10. The upper furnace door anchor bolts 110 pass through the arched locking bricks 104, the upper furnace door heat insulation bricks 113, and the upper furnace door heat insulation pads 112 in sequence and are locked and fixed to the back plate of the upper furnace door shell 101.

[0059] like Figure 9 As shown, the inner periphery of the brick wall formed by the bottom wall locking brick 107, the bottom side pressing brick 108, the arched locking brick 104, and the arched pressing brick 105 is provided with a communicating upper furnace door hot plate slot 117 for inserting the upper furnace door hot plate 103.

[0060] like Figure 10 As shown, the middle section of the arched brick wall 102 is the insertion section, and the hot end face of this section adopts an inward structure, which facilitates the insertion of the upper furnace door hot plate 103 into the upper furnace door hot plate slot 117. The inner circumference of the bottom brick wall 106 also has an upper furnace door hot plate slot 117. During insertion, each hot plate unit is inserted into the insertion slot in order from smallest to largest. The upper furnace door hot plate 103 is located at the hot end of the arched brick wall 102 and the bottom brick wall 106, and the upper furnace door hot plate slot 117 adopts a rectangular groove.

[0061] like Figure 9 and Figure 10As shown, a bottom wall lintel 109 is detachably connected to the bottom wall locking brick 107 and the bottom side pressing brick 108 via a dovetail insert structure. The bottom wall lintel 109 is also composed of several interconnected bricks. The bottom wall lintel 109, bottom wall locking brick 107, and bottom side pressing brick 108 are made of the same material and have the same coefficient of thermal expansion to avoid thermal stress caused by different coefficients of thermal expansion. The bottom wall lintel 109 has an outwardly extending flange at its lower end (e.g., ...). Figure 4 (As shown), the flange can extend beyond the upper furnace door insulation pad 112 and cover the lower end of the upper furnace door housing 101 to form protection for the upper furnace door housing.

[0062] The upper furnace door hot plate 103, arch wall locking brick 104, arch wall pressing brick 105, bottom wall locking brick 107, bottom wall pressing brick 108 and bottom wall lintel 109 are made of zero-expansion silica bricks or low-expansion mullite.

[0063] like Figure 11 As shown, this embodiment differs from the previous embodiment in that the upper furnace door panel slot 117 adopts a trapezoidal slot, and the outer surface of the upper furnace door hot plate 103 is located on the same vertical plane as the end face of the arched brick wall 102 and / or the bottom brick wall 106. The bottom wall lintel 109 is interlocked with the bottom wall locking brick 107 and the bottom side pressing brick 108 by anchoring brick 119. In addition to the above two structures, the installation structure of the bottom wall lintel 109 with the bottom wall locking brick 107 and the bottom side pressing brick 108 can also adopt adhesive joint, tenon joint, and other connection structures. A support brick 120 is embedded in the upper furnace door insulation pad 112, which is placed on the flat shell wall of the upper furnace door shell 101. The support brick 120 is a mullite heat insulation brick, which plays a role in load bearing and support.

[0064] like Figure 12 , Figure 13 and Figure 14 As shown, the lower furnace door 2 has a rectangular recessed lower furnace door insulation cavity 214 in its lower furnace door shell 2. A frame-shaped brick wall 203 is installed circumferentially on the inner side of the rectangular perimeter of the lower furnace door shell 201. The frame-shaped brick wall 203 is constructed by interlocking frame wall facing bricks 204 with tenons and mortises. The frame wall facing bricks 204 constituting the frame-shaped brick wall 203 are sequentially installed in the lower furnace door insulation cavity 214 of the lower furnace door shell 201 via lower furnace door insulation bricks 209 and lower furnace door insulation pads 208.

[0065] The lower furnace door anchor bolt 212 passes through the frame wall brick 204, the lower furnace door heat insulation brick 209, and the lower furnace door heat insulation pad 208 and is fixed to the back plate of the lower furnace door shell 201. The lower furnace door anchor bolt 212 adopts a countersunk hole fixing structure, and its bolt hole end is filled with a lower furnace door bolt protective plug 213. The lower furnace door bolt protective plug 213 includes a high-temperature mortar section at the outer end and a ceramic fiber filling section at the inner end; the bolt body of the lower furnace door anchor bolt 212 is covered with a nano-ceramic fiber sleeve.

[0066] A slot 217 for the furnace door hot plate is provided on the inner side of the frame wall bricks 204 that constitute the frame-shaped brick wall 203. The furnace door hot plate 205 includes six panel units, and the furnace door hot plate 205 is inserted into the furnace door hot plate slot 217 from the insertion end on one side of the frame-shaped brick wall 203. The furnace door hot plate located at the insertion end is an insertion hot plate 206 with bolt holes. The brick joints between two adjacent furnace door hot plates 205 and insertion hot plates 206 are filled with high-temperature mortar or high-temperature resistant ceramic fiber. Of course, in addition to the above-mentioned multi-panel unit split combination structure, the furnace door hot plate 205 can also be a single panel structure.

[0067] A lintel seal 207 is fitted into the outer wall surface of the frame wall facing bricks 204 that constitute the frame-shaped brick wall 203 via an embedding groove. The lintel seal 207 is made of high-temperature resistant ceramic fiber board or high-temperature resistant ceramic fiber blanket. The furnace door hot plate 205 and the frame wall facing bricks 204 are made of zero-expansion silica bricks or low-expansion mullite. The lintel seal 207 may also be fitted only into the embedding groove on the outer wall surface of the upper brick wall of the frame-shaped brick wall (203).

[0068] The frame wall bricks 204 are laid on the lower furnace door insulation bricks 209. The lower furnace door insulation bricks 209 are made of mullite insulation bricks, or they can be alumina-enhanced insulation bricks or alumina hollow spherical bricks. A lower furnace door insulation pad 208 is laid between the lower furnace door insulation bricks 209 and the shell wall and back plate of the lower furnace door shell 201. The lower furnace door insulation pad 208 is made of zirconium-containing nano-ceramic fiber board or zirconium-containing nano-ceramic fiber blanket, or it can be made of corresponding nano-ceramic fibers such as alumina, silicon carbide and silicon nitride.

[0069] A heat-insulating filling layer 211 for the lower furnace door is filled within the rectangular cavity formed by the frame-shaped brick wall 203, the lower furnace door hot plate 205, and the back plate of the lower furnace door shell 201. This heat-insulating filling layer 211 is made of ceramic fiber folded blocks, or it can be made of other high-temperature resistant ceramic fiber materials such as ceramic fiber blankets. A door perimeter seal 202 is installed circumferentially around the outer perimeter of the lower furnace shell 201.

[0070] like Figure 15 and Figure 16 As shown, the shell wall and back plate of the lower furnace door housing 201 form a U-shaped lower furnace door insulation cavity 214. Multiple lower furnace door anchor bolt holes 215 are provided at corresponding positions on the frame wall bricks 204. A frame wall limiting plate 210 is installed in the lower furnace door insulation cavity 214 of the lower furnace door housing 201. This frame wall limiting plate 210 is an angle iron fixed to the inner wall of the back plate of the lower furnace door housing 201. A frame-shaped brick wall 203 is located between the shell wall of the lower furnace door housing 201 and the frame wall limiting plate 210. Besides adopting a rectangular frame structure, the frame wall limiting plate 210 can also be a single angle iron structure located at the upper part of the lower furnace door insulation cavity 214.

[0071] like Figure 17 As shown, the door perimeter seal 202 includes a strip-shaped sealing strip 218, which can be an asbestos strip or a sealing strip made of ceramic fiber. The sealing strip 218 is embedded in the mounting groove of a similarly elongated sealing strip support plate 219. The sealing strip support plate 219 is fixedly connected to several pressing slide shafts 220. Each pressing slide shaft 220 is slidably supported on a sealing support 222, and the sealing supports 222 are all fixedly installed on the outer periphery of the lower furnace door shell 201. A pressing spring 221 is supported between the pressing shaft 220 and the sealing support 222. The pressing spring 221 presses the sealing strip 218 against the outer wall of the upper furnace door shell 101 through the pressing slide shaft 220 and the sealing strip support plate 219 in sequence.

[0072] like Figure 18 and Figure 19 As shown, the frame-shaped brick wall 203 is a rectangular frame structure composed of several mutually stacked frame wall bricks 204. Three inner wall surfaces of the frame-shaped brick wall 203 are provided with lower furnace door hot plate slots 217, and another wall surface of the frame-shaped brick wall 203 is provided with an insertion groove, so that the insertion plate unit can be inserted into the lower furnace door hot plate slot 217 of the frame-shaped brick wall 203, and the insertion hot plate 206 is located at the aforementioned insertion groove position.

[0073] The masonry surfaces of adjacent frame wall bricks 204 are respectively provided with interlocking tenons and mortises, and each frame wall brick 204 is provided with a screw hole 216 for the furnace door brick body. Of course, the frame brick wall 203 can also adopt the following... Figure 5 The alternating fixed structure shown.

[0074] like Figure 20 As shown, the difference between this embodiment and the above embodiment is that the slot 217 of the lower furnace door hot plate on the frame wall brick 204 adopts a trapezoidal slot, and the surface of the lower furnace door hot plate 205 and the surface of the frame brick wall 203 are on the same vertical plane.

[0075] The above are only some preferred embodiments of the present invention, but the present invention is not limited thereto, and many improvements and modifications can be made. Any improvements and modifications made based on the basic principles of the present invention should be considered to fall within the protection scope of the present invention.

Claims

1. A heat recovery coke oven door, comprising an upper oven door (1) and a lower oven door (2) arranged opposite to each other, characterized in that: The upper furnace door (1) includes an upper furnace door shell (101). An arched brick wall (102) and a bottom brick wall (106) are built along the inner circumference of the shell wall of the upper furnace door shell (101) in the upper furnace door insulation cavity (115) of the upper furnace door shell (101). An upper furnace door surface heating plate (103) is installed on the hot end of the arched brick wall (102) and the bottom brick wall (106). An upper furnace door heat-insulating filling layer (114) is filled in the cavity formed by the back plate of the upper furnace door shell (101), the arched brick wall (102), the bottom brick wall (106) and the upper furnace door surface heating plate (103). The lower furnace door (2) includes a lower furnace door shell (201). A frame-shaped brick wall (203) is built along the inner circumference of the shell wall of the lower furnace door shell (201) in the lower furnace door insulation cavity (214) of the lower furnace door shell (201). A lower furnace door surface heating plate (205) is installed on the hot end of the frame-shaped brick wall (203). A lower furnace door heat-insulating filling layer (211) is filled in the cavity formed by the back plate of the lower furnace door shell (201), the frame-shaped brick wall (203), and the lower furnace door surface heating plate (205). The outer periphery of the shell wall of the lower furnace door housing (201) is equipped with a door periphery seal (202); the outer wall surface of the frame-shaped brick wall (203) is inlaid with a door lintel seal (207).

2. The heat recovery coke oven door according to claim 1, characterized in that: A bottom wall lintel (109) is detachably installed on the lower side of the bottom brick wall (106).

3. The heat recovery coke oven door according to claim 1, characterized in that: The arched brick wall (102) and the bottom brick wall (106) are installed in the upper furnace door insulation cavity (115) of the upper furnace door shell (101) through the upper furnace door insulation brick (113) and the upper furnace door insulation pad (112) in sequence.

4. The heat recovery coke oven door according to claim 1, 2 or 3, characterized in that: The upper furnace door hot plate (103) is inserted into the corresponding insertion slots of the arched brick wall (102) and the bottom side brick wall (106); the upper furnace door hot plate (103) is composed of several panel units, and the door panel gaps between adjacent panel units are filled with high-temperature mortar or ceramic fiber.

5. The heat recovery coke oven door according to claim 2, characterized in that: The bottom lintel (109) extends over the upper furnace door insulation pad (112) and covers the upper furnace door shell (101). The upper furnace door insulation pad (112) is laid in the upper furnace door insulation cavity (115) of the upper furnace door shell (101). The bottom side brick wall (106) and the bottom lintel (109) are connected to each other by an insertion structure or a locking structure. The bottom side brick wall (106) and the bottom lintel (109) have the same or similar coefficients of thermal expansion.

6. The heat recovery coke oven door according to claim 1, 2 or 3, characterized in that: The upper furnace door hot plate (103), arch wall locking brick (104), arch wall pressing brick (105), bottom wall locking brick (107), bottom wall pressing brick (108) and bottom wall lintel (109) are made of zero-expansion silica bricks or low-expansion mullite bricks; the upper furnace door heat-insulating filling layer (114) is filled with ceramic fiber blankets or ceramic fiber folded blocks; the upper furnace door heat insulation brick (113) is made of mullite heat insulation bricks, high-alumina heat insulation bricks or alumina hollow sphere bricks; the upper furnace door heat insulation pad (112) is made of nano-ceramic fiber board or nano-ceramic fiber blanket.

7. The heat recovery coke oven door according to claim 1, characterized in that: The lintel seal (207) is embedded in the mounting groove on the outer wall of the upper brick wall of the frame brick wall (203), and the lintel seal (207) is made of ceramic fiber board or ceramic fiber blanket.

8. The heat recovery coke oven door according to claim 1, characterized in that: The door perimeter seal (202) includes a sealing strip (218) arranged along the outer periphery of the shell wall of the lower furnace door shell (201). The sealing strip (218) is embedded in a sealing strip support plate (219), and a plurality of compression springs (221) are supported on the sealing strip support plate (219).

9. The heat recovery coke oven door according to claim 1, 7, or 8, characterized in that: The lower furnace door hot plate (205) is inserted into the insertion groove on the inner periphery of the frame brick wall (203); the lower furnace door hot plate (205) is composed of several panel units, and the door panel gap between two adjacent panel units is filled with high-temperature mortar or ceramic fiber.

10. The heat recovery coke oven door according to claim 1, 7, or 8, characterized in that: The frame-shaped brick wall (203) is installed in the lower furnace door insulation cavity (214) of the lower furnace door shell (201) in sequence through the lower furnace door insulation brick (209) and the lower furnace door insulation pad (208).

11. The heat recovery coke oven door according to claim 1, 6, 7 or 8, characterized in that: A frame wall limiting plate (210) is provided between the heat insulation brick (209) of the lower furnace door and the heat-insulating filling layer (211) of the lower furnace door; the frame-shaped brick wall (203) is constructed by sequentially building frame wall facing bricks (204); the frame wall facing bricks (204) are fixedly installed on the lower furnace door shell (201) by lower furnace door anchor bolts (212).

12. The heat recovery coke oven door according to claim 1, 6, 7 or 8, characterized in that: The frame wall bricks (204) and the lower furnace door hot plate (205) are made of zero-expansion silica bricks or low-expansion mullite; the lower furnace door heat-insulating filling layer (211) is filled with ceramic fiber blankets or ceramic fiber folded blocks; the lower furnace door heat insulation pad (208) is made of nano-ceramic fiber boards or nano-ceramic fiber blankets.

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