Vertical heat recovery coke oven

Abstract

The embodiment of the invention provides a vertical heat recovery coke oven. The vertical heat recovery coke oven comprises a coke oven bed bottom, a lower flue, a heat exchange chamber, a chute, a plurality of carbonization chambers, a plurality of combustion chambers and an oven top which are sequentially arranged in the height direction. The lower flue comprises a plurality of transverse arches which are sequentially arranged at intervals, a plurality of longitudinal arches which are sequentially arranged at intervals, at least one flue outlet and a plurality of flue gas inlets, and the transverse arches and the longitudinal arches are mutually crossed and communicated to form a multi-split linked arch. When the lower flue bears a load, the load of the upper masonry is dispersed to a plurality of arch structures through the crossed layout of the multi-split arch, so that an integral stress system is formed, and the furnace body structure of the vertical heat recovery coke oven is more stable. In a high-temperature environment, the arch size of the multi-split combined arch is small, so that the expansion deformation of the arch structure is small, and the problem of leakage is not easy to occur. Meanwhile, high-temperature flue gas is divided by the multi-division structure of the multi-division combined arch, so that the gas flow distribution is more uniform, and the thermal regulation of the coke oven is facilitated.

Description

Technical Field

[0001] This application relates to the field of coke oven technology, and in particular to a vertical heat recovery coke oven. Background Technology

[0002] Vertical heat recovery coke ovens are efficient and environmentally friendly coking equipment that recovers the waste heat from the high-temperature flue gas generated by burning raw coal gas to generate electricity or heat, achieving cascaded energy utilization. However, there are still pressing issues to be addressed regarding the high-temperature flue gas ducts of vertical heat recovery coke ovens.

[0003] Compared to the flue gas temperature of conventional coke ovens (not exceeding 300℃), the flue gas temperature in the flue gas of a vertical heat recovery coke oven (hereinafter referred to as the lower flue gas) is extremely high (approximately 1300℃). Furthermore, the lower flue gas is located directly below the coke oven and bears the entire load of the oven body. During long-term operation, this combined load can easily lead to deformation or even partial collapse of the flue gas support structure, causing serious safety accidents. In addition, the refractory materials constituting the flue gas inevitably undergo thermal expansion under high-temperature conditions, which can easily lead to problems such as leakage within the high-temperature flue gas. Summary of the Invention

[0004] The purpose of this application is to provide a vertical heat recovery coke oven to improve the structural stability of the flue gas duct, reduce flue gas leakage, and improve the uniformity of stress and airflow distribution under high-temperature (approximately 1300°C) flue gas conditions. The specific technical solution is as follows:

[0005] A vertical heat recovery coke oven, comprising:

[0006] roof;

[0007] Multiple carbonization chambers and multiple combustion chambers extend laterally along the vertical heat recovery coke oven, and the multiple carbonization chambers and multiple combustion chambers are arranged alternately in sequence along the longitudinal direction of the vertical heat recovery coke oven;

[0008] ramp;

[0009] Heat exchange chamber;

[0010] The lower flue is located at the bottom of multiple carbonization chambers and multiple combustion chambers. The lower flue includes multiple transverse arches, multiple longitudinal arches, at least one flue outlet, and multiple flue gas inlets arranged at intervals. The positions of the multiple transverse arches and multiple combustion chambers are arranged one-to-one in the height direction of the vertical heat recovery coke oven. The multiple transverse arches and multiple longitudinal arches intersect and connect with each other to form a multi-segmented arch. Along the longitudinal direction, the flue outlet is located on at least one side of the lower flue and connects with the multi-segmented arch. The multiple flue gas inlets are located at the top of the lower flue and connect the flue gas outlets of the multiple combustion chambers and the multi-segmented arch.

[0011] Coke oven bottom;

[0012] The coke oven bottom, the lower flue, the heat exchange chamber, the inclined flue, multiple carbonization chambers and multiple combustion chambers, and the furnace top are arranged sequentially along the height direction.

[0013] In some embodiments, the transverse arch is an arcuate arch or a cantilevered polygonal arch; and / or, the longitudinal arch is an arcuate arch or a cantilevered polygonal arch; and / or, the flue outlet is an arcuate arch or a cantilevered polygonal arch.

[0014] In some embodiments, the longitudinal arch is a semi-circular arch, and the transverse arch and the flue outlet are both cantilevered polygonal arches.

[0015] In some embodiments, along the height direction, the multi-span arch is at least one layer or more layers.

[0016] In some embodiments, the multi-span arch includes a top wall, a bottom wall, and side walls; the side walls include an inner side wall, a middle side wall, and an outer side wall extending from the inside to the outside of the multi-span arch, wherein the top wall, the bottom wall, and the inner side wall are made of silica bricks, the middle side wall is made of clay bricks, and the outer side wall is made of perlite bricks.

[0017] In some embodiments, the lower flue includes multiple observation holes and multiple plug bricks. Along the longitudinal direction, the multiple observation holes are opened at different positions on the sidewalls of the machine side and coke side of the lower flue and are connected to the multi-section arch. The openings of the multiple plug bricks and the multiple observation holes are detachably sealed one by one.

[0018] The wall of the observation hole is made of high-alumina brick.

[0019] In some embodiments, each of the transverse and longitudinal arches is provided with a crossbeam, the two ends of which abut against the arch columns on both sides of the arch.

[0020] In some embodiments, a support member is provided between the bottom and the arch columns on both sides of each of the transverse and longitudinal arches.

[0021] In some embodiments, each transverse arch and a plurality of longitudinal arches are connected, and each longitudinal arch and a plurality of transverse arches are connected.

[0022] In some embodiments, it also includes:

[0023] Coke oven concrete foundation;

[0024] The coke oven bottom is provided with the coke oven concrete foundation, the coke oven bottom and the lower flue arranged in sequence along the height direction. At least one of the machine side and coke side of the coke oven bottom is provided with a cold air inlet.

[0025] The lower flue includes a supplementary air duct that is independent of the multi-section arch;

[0026] A heat exchange chamber is disposed between the combustion chamber and the lower flue.

[0027] The cold air inlet, the supplementary air duct, the heat exchange chamber, and the combustion chamber are connected in sequence.

[0028] Beneficial effects of the embodiments in this application:

[0029] This application provides a vertical heat recovery coke oven, comprising a coke oven base, a lower flue, a heat exchange chamber, an inclined duct, multiple carbonization chambers, multiple combustion chambers, and a furnace top arranged sequentially along its height. The lower flue includes multiple transverse arches, multiple longitudinal arches arranged sequentially at intervals, at least one flue outlet, and multiple flue gas inlets. The transverse and longitudinal arches intersect and connect to form multiple interconnected arches. Along the longitudinal direction, the flue outlet is located on at least one side of the lower flue and connects to the multiple interconnected arches. The multiple flue gas inlets are located at the top of the lower flue and connect the flue gas outlets of the multiple combustion chambers and the multiple interconnected arches.

[0030] When the lower flue bears the load of the upper masonry, the intersecting layout of the multi-arched structure evenly distributes the load across multiple arches, reducing stress concentration at the arch feet and forming a unified load-bearing system. This makes the structure of the vertical heat recovery coke oven more stable. In high-temperature environments, the smaller arch size of the multi-arched structure results in less expansion and deformation, reducing the likelihood of leakage. Furthermore, this multi-arched structure diverts the high-temperature flue gas, resulting in a more uniform airflow distribution and facilitating coke oven thermal regulation.

[0031] Of course, implementing any product or method of this application does not necessarily require achieving all of the advantages described above at the same time. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other embodiments can be obtained based on these drawings.

[0033] Figure 1 A schematic diagram of the lower flue of a vertical heat recovery coke oven provided in an embodiment of this application;

[0034] Figure 2 for Figure 1 A schematic diagram of the internal structure of the lower flue of a vertical heat recovery coke oven is shown.

[0035] Figure 3 for Figure 1 A schematic diagram of the fluid domain in the lower flue of a vertical heat recovery coke oven.

[0036] Figure 4 for Figure 3 A magnified view of a portion of the fluid domain shown;

[0037] Figure 5 for Figure 1 A schematic diagram of the partial internal structure of the lower flue of a vertical heat recovery coke oven after cross-section.

[0038] Figure 6 for Figure 5 The diagram shows a cross-sectional view of AA.

[0039] Figure 7 for Figure 5 The diagram shows a cross-sectional view of BB.

[0040] Figure 8 for Figure 1 A partial cross-sectional view of the machine side of the lower flue of a vertical heat recovery coke oven.

[0041] Figure 9 for Figure 8 A partial structural diagram of a transverse arch is shown.

[0042] Figure 10 for Figure 1 The diagram shows the structure of the flue outlet of the lower flue of a vertical heat recovery coke oven.

[0043] Figure 11 A cross-sectional view of another longitudinal arch structure of the lower flue of a vertical heat recovery coke oven provided in an embodiment of this application;

[0044] Figure 12 A cross-sectional view of another longitudinal arch structure of the lower flue of a vertical heat recovery coke oven provided in an embodiment of this application;

[0045] Figure 13 A cross-sectional view of a longitudinal arch structure of the lower flue of a vertical heat recovery coke oven provided in this application embodiment;

[0046] Figure 14 for Figure 1 The diagram shows a partial cross-sectional view of the flue outlet of the lower flue of a vertical heat recovery coke oven.

[0047] The attached figures are labeled as follows:

[0048] Lower flue 1, transverse arch 11, longitudinal arch 12, flue outlet 13, flue gas inlet 14, crossbeam 15, support member 16, observation hole 17, hole wall 171, supplementary air duct 18.

[0049] Top wall 101, bottom wall 102, side wall 103, inner side wall 1031, middle side wall 1032, outer side wall 1033.

[0050] Horizontal fluid 111, longitudinal fluid 121, outlet fluid 131.

[0051] Horizontal direction X, vertical direction Y, vertical direction Z. Detailed Implementation

[0052] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art based on this application are within the scope of protection of this application.

[0053] In practical applications of vertical heat recovery coke ovens, the high-temperature flue area is continuously exposed to a flue gas environment of approximately 1300°C. In order to improve the structural stability of the lower flue, reduce leakage, and improve the operational reliability and process continuity of the vertical heat recovery coke oven, embodiments of this application propose a vertical heat recovery coke oven.

[0054] Figure 1 A schematic diagram of the lower flue 1 of a vertical heat recovery coke oven provided in an embodiment of this application; Figure 2 for Figure 1 A schematic diagram of the internal structure of the lower flue 1 of the vertical heat recovery coke oven shown; Figure 3 for Figure 1 A schematic diagram of the fluid domain of the lower flue 1 of the vertical heat recovery coke oven shown. Figure 4 for Figure 3 A magnified view of a portion of the fluid domain shown; Figure 5 for Figure 1 The diagram shows a partial internal structure of the lower flue 1 of the vertical heat recovery coke oven after cross-section. Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, the vertical heat recovery coke oven includes a coke oven bottom, a lower flue, a heat exchange chamber, an inclined duct, multiple carbonization chambers, multiple combustion chambers, and a furnace top. The coke oven bottom, the lower flue, the heat exchange chamber, the inclined duct, the multiple carbonization chambers, the multiple combustion chambers, and the furnace top are arranged sequentially along the height direction Z.

[0055] Each carbonization chamber extends along the transverse X direction of the vertical heat recovery coke oven, and each combustion chamber extends along the transverse X direction of the vertical heat recovery coke oven. Multiple carbonization chambers and multiple combustion chambers are arranged alternately along the longitudinal Y direction of the vertical heat recovery coke oven. A lower flue 1 is located at the bottom of the multiple carbonization chambers and multiple combustion chambers. The lower flue 1 includes multiple transverse arches 11, multiple longitudinal arches 12, at least one flue outlet 13, and multiple flue gas inlets 14, arranged at intervals in sequence. The positions of the multiple transverse arches 11 and multiple combustion chambers are correspondingly arranged in the height Z direction of the vertical heat recovery coke oven. The multiple transverse arches 11 and multiple longitudinal arches 12 intersect and connect to form multiple interconnected arches. Along the longitudinal Y direction, the flue outlet 13 is located on at least one side of the lower flue 1 and connects to the multiple interconnected arches. The multiple flue gas inlets 14 are located at the top of the lower flue 1, connecting the flue gas outlets of the multiple combustion chambers and the multiple interconnected arches.

[0056] Specifically, each combustion chamber is connected to at least one flue gas inlet 14. For example, along the transverse X of the vertical heat recovery coke oven, each combustion chamber is connected to multiple flue gas inlets 14, the specific number and cross-sectional area of ​​which depend on the amount of flue gas discharged from the combustion chamber.

[0057] Among them, multiple transverse arches 11 and multiple longitudinal arches 12 intersect and connect to form a multi-branched arch. The multi-branched arch refers to a grid-like support structure formed by multiple transverse arches 11 and multiple longitudinal arches 12 intersecting and connecting to each other. Both the transverse arches 11 and the longitudinal arches 12 serve as flues, and they can be implemented as a layout of multiple flues intersecting each other, so that the multi-branched arch serves as both a high-temperature flue gas passage and a foundation supporting the vertical heat recovery coke oven.

[0058] In practice, each transverse arch 11 and multiple longitudinal arches 12 are connected, and each longitudinal arch 12 and multiple transverse arches 11 are connected, thus forming an intersecting grid-like flue passage.

[0059] Combination Figure 3 and Figure 4 As shown, during the operation of the vertical heat recovery coke oven, the flue gas generated in the combustion chamber enters the multi-arched structure through the flue gas inlet 14. The flue gas flows within the transverse arch 11 to form a transverse fluid 111, and within the longitudinal arch 12 to form a longitudinal fluid 121. Finally, it enters the flue outlet 13 to form the outlet fluid 131. The flue gas is then discharged from the flue outlet 13 and sent to a waste heat boiler for power generation or discharged through a chimney.

[0060] like Figure 5 As shown, the vertical heat recovery coke oven also includes: a coke oven concrete foundation, a coke oven floor, and a heat exchange chamber. Along the height direction Z, the coke oven concrete foundation, the coke oven floor, and the lower flue 1 are arranged sequentially. At least one side of the coke oven floor, on the machine side and the coke side, is provided with a cold air inlet. The lower flue 1 includes a supplementary air duct 18 that is independent of the multi-arch structure. The heat exchange chamber is located between the combustion chamber and the lower flue 1. The cold air inlet, the supplementary air duct 18, the heat exchange chamber, and the combustion chamber are connected sequentially.

[0061] Specifically, the coke oven concrete foundation refers to the bottom support structure used to bear the load of the masonry above it, which can be achieved by the integral casting process of reinforced concrete.

[0062] Supplemental air duct 18 refers to an independent airflow channel physically isolated from the multi-branch arch, with the purpose of introducing external air into the combustion chamber.

[0063] Specifically, after the cold air inlet at the bottom of the coke oven introduces ambient air, it is transported to the heat exchange chamber through the supplementary air duct 18. This independent duct avoids intersecting with the flue gas path of the multi-arched structure. The heat exchange chamber uses the high-temperature flue gas discharged from the combustion chamber to indirectly heat the air flowing through it, so that the preheated air enters the combustion chamber to participate in combustion. This connection path is based on the flue gas temperature gradient change law, so that the cold air completes the heat exchange process before entering the combustion chamber, which not only reduces the flue gas temperature entering the lower flue duct 1, but also optimizes the thermal energy state of the combustion air.

[0064] As a specific implementation method, the solution of this application is implemented as follows: For example, two supplementary air ducts 18 are provided below each combustion chamber, and each combustion chamber is connected to its corresponding supplementary air duct 18. Cold air inlets are provided on both the machine side and the coke side of the coke oven bottom. After the cold air enters the cold air inlet, it absorbs the heat transferred downward by the flue gas in the lower flue duct 1. On the one hand, it can reduce the temperature of the coke oven concrete foundation to below 100°C, and on the other hand, it can preheat the incoming cold air to 150°C. The air preheated to 150°C is sent to the heat exchange chamber through the supplementary air duct 18 for further heat exchange with the high-temperature flue gas for preheating. After further preheating, it enters the combustion chamber from the heat exchange chamber.

[0065] Through the above scheme, in the embodiments of this application, the cold air first absorbs the heat transferred downward by the flue gas in the lower flue 1 and preheats it to 150°C, and then is sent to the heat exchange chamber by the supplementary air duct 18 for further preheating, which optimizes the preheating process of the combustion air and improves the combustion efficiency.

[0066] Figure 6 for Figure 5 The diagram shows a cross-sectional view of AA. Figure 7 for Figure 5 The schematic diagram of the cross-sectional structure of BB is shown below; as follows: Figure 5 , Figure 6 and Figure 7 As shown, when the lower flue 1 bears the load of the upper masonry, the cross-layout of the multi-arch structure distributes the load of the upper masonry to multiple arch structures. The resulting horizontal thrust is partially transferred to adjacent arches (the downward pressure is converted into downward-sloping components on both sides). By increasing the number of arches, the load of the upper masonry of the flue can be evenly distributed, reducing stress concentration at the arch feet and forming a unified force system, making the structure of the vertical heat recovery coke oven more stable. Compared to a single-arch structure, the multi-arch structure satisfies the correspondence between arch height and span, ensuring the flue gas flow area while effectively reducing the arch height, thereby reducing the overall height of the vertical heat recovery coke oven and saving investment. In high-temperature environments, the smaller arch size of the multi-arch structure results in less expansion and deformation, making leakage less likely. Simultaneously, this multi-arch structure diverts the high-temperature flue gas, making the airflow distribution more uniform and beneficial for coke oven thermal regulation.

[0067] Multiple transverse arches 11 are arranged one-to-one with the combustion chamber positions in the height direction Z, ensuring that the high-temperature flue gas discharged from each combustion chamber is collected in a targeted manner. Along the longitudinal direction Y, the flue outlet 13 is located on one or both sides of the lower flue 1 and is connected to the multiple branch arches, which facilitates the concentrated and orderly discharge of high-temperature flue gas from the side of the lower flue 1.

[0068] Specifically, the multi-span arch is a single-layer structure, that is, a layer of horizontal arch 11 and a layer of vertical arch 12 intersect and connect to form a multi-span arch.

[0069] like Figure 5 , Figure 6 and Figure 7 As shown, there are multiple longitudinal arches 12, which are spaced apart along the transverse X direction.

[0070] Specifically, the longitudinal arch 12 refers to the arched load-bearing structure extending longitudinally Y along the lower flue 1. It can be an arc-shaped arch, specifically a semi-circular arch. The purpose is to uniformly distribute stress during thermal expansion through the symmetrical arc structure, thereby avoiding material cracking caused by local stress concentration.

[0071] Specifically, the solution of this application achieves uniform distribution of thermal expansion stress through the semi-circular arch structure of the longitudinal arch 12, avoiding local stress concentration caused by sharp corners or asymmetrical shapes.

[0072] As one specific implementation, the longitudinal arch 12 of this application can be specifically a semi-circular arch structure constructed of silica bricks.

[0073] Figure 8 for Figure 1A partial cross-sectional view of the machine side of the lower flue 1 of the vertical heat recovery coke oven shown. Figure 9 for Figure 8 The diagram shows a partial structural schematic of the transverse arch 11; as shown. Figure 8 and Figure 9 As shown, there are multiple transverse arches 11, which are spaced apart along the longitudinal direction Y, forming a cantilevered polygonal arch.

[0074] The transverse arch 11 refers to the arched channel structure that extends transversely along the lower flue 1. It can be a cantilevered polygonal arch, specifically a polygonal arch (the top of the arch can be trapezoidal and the bottom of the arch can be rectangular). The purpose is that the thermal expansion deformation of the polygon is controllable and predictable.

[0075] The transverse arch 11 can be specifically a cantilevered polygonal arch constructed of bricks. On the one hand, its trapezoidal hypotenuse forms an angle with the horizontal plane to enhance the support rigidity. On the other hand, the use of a cantilevered polygonal arch facilitates the brick-making process.

[0076] Figure 10 for Figure 1 The diagram shows the structure of the flue outlet 13 of the lower flue 1 of the vertical heat recovery coke oven; as shown. Figure 10 As shown, the flue outlet 13 is a cantilevered polygonal arch.

[0077] The flue outlet 13 refers to the channel structure in the lower flue 1 used to discharge high-temperature flue gas. It can be a cantilevered polygonal arch, specifically a hexagonal arch (the top of the arch can be trapezoidal and the bottom of the arch can be rectangular). The purpose is that the thermal expansion deformation of the polygonal arch structure is controllable and predictable.

[0078] The flue outlet 13 can be specifically a cantilevered hexagonal arch constructed of bricks (the top of the arch can be trapezoidal and the bottom of the arch can be rectangular). On the one hand, the inclined side of the trapezoid forms an angle with the horizontal plane to enhance the support rigidity. On the other hand, the use of a cantilevered hexagonal arch facilitates the brick making process.

[0079] Through the above-mentioned solution, this application effectively suppresses the tendency of the arch to crack in a high-temperature environment, reduces structural compression damage caused by limited expansion, ensures the sealing integrity of the flue gas channel, significantly reduces the risk of high-temperature flue gas leakage, and thus improves the structural stability and safety of the lower flue duct 1 in a high-temperature environment of 1300℃.

[0080] In other embodiments, the longitudinal arch 12 can also be a polygonal arch, specifically a hexagonal arch (the top of the arch can be trapezoidal, and the bottom of the arch can be rectangular). The transverse arch 11 and the flue outlet 13 can also be arc-shaped arches, specifically semi-circular arches.

[0081] The number of arches and the flow area of ​​the multi-arch structure are determined by a combination of factors, including the stress analysis of the vertical heat recovery coke oven structure and the fluid resistance of high-temperature flue gas. In some specific embodiments, the multi-arch structure is not limited to a single layer and can also be designed in layers along the height direction Z. The multi-arch structure can be designed as a two-, three- or more-layered structure. Specifically, it can adopt a stacked layout of refractory bricks. The purpose is to further enhance the overall structural strength of the multi-arch structure through layered arrangement.

[0082] Specifically, the multi-layered structural design along the height direction Z increases the number of arches (transverse arches 11 and longitudinal arches 12) while reducing their height. This layered arrangement disperses the vertical load on the coke oven body and reduces deformation due to heat absorption. In other words, when high-temperature flue gas causes material expansion, the relative displacement between layers is small, reducing the risk of refractory material cracking and thus strengthening the overall sealing and anti-collapse capability of the flue system.

[0083] Figure 11 A cross-sectional view of another longitudinal arch 12 of the lower flue 1 of a vertical heat recovery coke oven provided in this application embodiment is shown below. Figure 11 As shown, the first layer of transverse arches 11 and the first layer of longitudinal arches 12 intersect and connect with each other to form the first layer of multi-segmented arches, and the second layer of transverse arches 11 and the second layer of longitudinal arches 12 intersect and connect with each other to form the second layer of multi-segmented arches.

[0084] Through the above-mentioned solution, this application effectively improves the problems of structural instability, collapse and flue leakage caused by thermal expansion and concentrated load on the coke oven body, and ensures the safe flow of high-temperature flue gas and the long-term reliable operation of equipment.

[0085] Figure 12 This application provides a cross-sectional view of another longitudinal arch 12 of the lower flue 1 of a vertical heat recovery coke oven, as shown in the embodiments of this application. Figure 12 As shown, each of the transverse arches 11 and the longitudinal arches 12 is provided with a crossbeam 15, the two ends of which abut against the arch columns on both sides of the arch.

[0086] Among them, the crossbeam 15 is a supporting component used to enhance the stability of the arch structure. In the embodiments of this application, by setting the crossbeam 15, the probability of cracking and flue gas leakage in the lower flue 1 can be further reduced, ensuring the structural stability of the lower flue 1 in a high-temperature environment and improving the problem of decreased sealing performance caused by thermal expansion.

[0087] Figure 13 A cross-sectional view of a longitudinal arch 12 of the lower flue 1 of a vertical heat recovery coke oven provided in this application embodiment; as shown. Figure 13As shown, each of the transverse arches 11 and the longitudinal arches 12 has a support member 16 between its bottom and the arch columns on both sides.

[0088] Among them, the support component 16 is a refractory material component used to enhance the stability of the arch structure, and it can be a bracket, support block, etc.

[0089] As a specific implementation method, the solution of this application is implemented as follows: the support member 16 can be a triangular bracket, one side of which is fixedly connected to the bottom of the arch and the other side is fixedly connected to the arch column to provide support.

[0090] Through the above-described solution, the embodiments of this application, by setting the support member 16, effectively reduce the arch deformation, cracking, and high-temperature flue leakage caused by high-temperature thermal expansion, improve the structural safety of the lower flue 1 under high-temperature and high-load environments, and extend its service life.

[0091] Figure 14 for Figure 1 The diagram shows a partial cross-sectional view of the flue outlet of the lower flue of a vertical heat recovery coke oven, where... Figure 14 For illustrative purposes only, the machine side of the lower flue 1 is used as an example. In practice, the coke side of the lower flue 1 can also be constructed using the same method as the machine side. Figure 14 and combined Figure 6 As shown, taking a multi-layered arch as an example, the multi-layered arch includes a top wall 101, a bottom wall 102, and side walls 103 on the coke side and machine side; the side walls 103 include an inner side wall 1031, a middle side wall 1032, and an outer side wall 1033 from the inside to the outside of the multi-layered arch. The top wall 101, bottom wall 102, and inner side wall 1031 are made of silica bricks, the middle side wall 1032 is made of clay bricks, and the outer side wall 1033 is made of cenosphere bricks.

[0092] Specifically, the lower flue 1 includes multiple observation holes 17 and multiple plug bricks. Along the longitudinal direction Y, the multiple observation holes 17 are opened at different positions on the sidewalls 103 of the machine side and coke side of the lower flue 1, and are connected to multiple branch arches. The openings of the multiple plug bricks and the multiple observation holes 17 are detachably sealed one by one. The hole wall 171 of the observation hole 17 includes high alumina bricks.

[0093] Among them, the top wall 101 and the bottom wall 102 refer to the load-bearing structural layers that constitute the top and bottom of the multi-segmented arch. They can be made of silica bricks, which have high load softening temperature, good thermal conductivity, and good resistance to acid erosion.

[0094] The inner sidewall 1031 refers to the portion of the wall directly exposed to the high-temperature flue gas environment. It can be made of silica brick, which has a high load softening temperature, good thermal conductivity, and excellent resistance to acid corrosion. The middle sidewall 1032 can be understood as the portion located between the inner sidewall 1031 and the outer sidewall 1033. It can be made of clay brick, which has good thermal shock stability and can ensure the integrity and tightness of the masonry structure over a wide temperature range.

[0095] The outer sidewall 1033 refers to the outer wall layer facing the external environment of the lower flue 1. It can be made of perlite brick material, which is a lightweight porous heat insulation material. Its purpose is to reduce the loss of heat from high-temperature flue gas and ensure the safety of operation on the outside of the coke oven.

[0096] The wall 171 of the observation hole 17 is made of high-alumina brick material, which has good fire resistance and thermal shock stability, ensuring structural integrity and sealing reliability.

[0097] Taking a multi-layered arch as an example, the multi-layered arch is designed as a two-layer structure. The upper and lower layers each include a top wall 101, a bottom wall 102, and a side wall 103. The side wall 103 includes an inner side wall 1031, a middle side wall 1032, and an outer side wall 1033 from the inside out. Each layer is constructed of refractory materials. The top wall 101 and bottom wall 102 are made of silica bricks, the middle side wall 1032 is made of clay bricks, and the outer side wall 1033 is made of perlite bricks.

[0098] In practice, the refractory material selected for the lower flue 1 of the vertical heat recovery coke oven can be replaced according to the physical and chemical properties and the operating conditions.

[0099] The embodiments of this application have at least one of the following advantages:

[0100] 1) The high-temperature flue of the vertical heat recovery coke oven is designed as a multi-arch structure, making it an integral load-bearing system, which makes the furnace structure more stable.

[0101] 2) The multi-arch structure can effectively reduce the arch height while satisfying the corresponding relationship between the arch height and the span, thereby reducing the overall height of the vertical heat recovery coke oven.

[0102] 3) Setting up multiple arch structures (each arch is small in size) results in less expansion and deformation under high temperature conditions, and more uniform overall stress distribution;

[0103] 4) The multi-arch structure diverts the high-temperature flue gas, making the airflow distribution more uniform and beneficial to the thermal regulation of the coke oven.

[0104] The above description is merely a preferred embodiment of this application and is not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application are included within the scope of protection of this application.

Claims

1. A vertical heat recovery coke oven, characterized in that, include: roof; ramp; Multiple carbonization chambers and multiple combustion chambers extend laterally (X) along the vertical heat recovery coke oven, and the multiple carbonization chambers and multiple combustion chambers are arranged alternately in sequence along the longitudinal direction (Y) of the vertical heat recovery coke oven; Heat exchange chamber; The lower flue (1) is located at the bottom of multiple carbonization chambers and multiple combustion chambers. The lower flue (1) includes multiple transverse arches (11) arranged at intervals, multiple longitudinal arches (12) arranged at intervals, at least one flue outlet (13) and multiple flue gas inlets (14). The positions of the multiple transverse arches (11) and multiple combustion chambers are arranged one-to-one in the height direction (Z) of the vertical heat recovery coke oven. The multiple transverse arches (11) and multiple longitudinal arches (12) are interconnected to form a multi-segmented arch. Along the longitudinal direction (Y), the flue outlet (13) is located on at least one side of the lower flue (1) and is connected to the multi-segmented arch. The multiple flue gas inlets (14) are located at the top of the lower flue (1) and are connected to the flue gas outlets of multiple combustion chambers and the multi-segmented arch. Coke oven bottom; The coke oven bottom, the lower flue, the heat exchange chamber, the inclined channel, multiple carbonization chambers and multiple combustion chambers, and the furnace top are arranged sequentially along the height direction (Z).

2. The vertical heat recovery coke oven according to claim 1, characterized in that, The transverse arch (11) is an arc arch or a cantilevered polygonal arch; and / or, the longitudinal arch (12) is an arc arch or a cantilevered polygonal arch; and / or, the flue outlet (13) is an arc arch or a cantilevered polygonal arch.

3. The vertical heat recovery coke oven according to claim 2, characterized in that, The longitudinal arch (12) is a semi-circular arch, and the transverse arch (11) and the flue outlet (13) are both cantilevered polygonal arches.

4. The vertical heat recovery coke oven according to claim 1, characterized in that, Along the height direction (Z), the multi-span arch is one or more layers.

5. The vertical heat recovery coke oven according to claim 1, characterized in that, The multi-section arch includes a top wall (101), a bottom wall (102), and a side wall (103); the side wall (103) includes an inner side wall (1031), a middle side wall (1032), and an outer side wall (1033) from the inside to the outside of the multi-section arch. The top wall (101), the bottom wall (102), and the inner sidewall (1031) are made of silica bricks, the middle sidewall (1032) is made of clay bricks, and the outer sidewall (1033) is made of cenosphere bricks.

6. The vertical heat recovery coke oven according to claim 5, characterized in that, The lower flue (1) includes multiple observation holes (17) and multiple plug bricks. Along the longitudinal direction (Y), the multiple observation holes (17) are opened at different positions on the sidewalls (103) of the machine side and coke side of the lower flue (1) and are connected to the multi-section arch. The openings of the multiple plug bricks and the multiple observation holes (17) are sealed in a one-to-one correspondence and detachably. The wall (171) of the observation hole (17) comprises high-alumina brick.

7. The vertical heat recovery coke oven according to claim 1, characterized in that, Each of the transverse arch (11) and the longitudinal arch (12) is provided with a crossbeam (15), the two ends of which abut against the arch columns on both sides of the arch.

8. The vertical heat recovery coke oven according to claim 1, characterized in that, Each of the transverse arches (11) and the longitudinal arches (12) has a support member (16) between the bottom and the arch columns on both sides.

9. The vertical heat recovery coke oven according to claim 1, characterized in that, Each transverse arch (11) and multiple longitudinal arches (12) are connected, and each longitudinal arch (12) and multiple transverse arches (11) are connected.

10. The vertical heat recovery coke oven according to any one of claims 1 to 9, characterized in that, Also includes: Coke oven concrete foundation; Along the height direction (Z), the coke oven concrete foundation, the coke oven floor and the lower flue (1) are arranged in sequence, and at least one side of the machine side and the coke side of the coke oven floor is provided with a cold air inlet; The lower flue (1) includes a supplementary air duct (18) that is independent of the multi-section arch. The heat exchange chamber is located between the combustion chamber and the lower flue (1); The cold air inlet, the supplementary air duct (18), the heat exchange chamber and the combustion chamber are connected in sequence.

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