Coke oven with duplex symmetrical flame path structure and external adjustable segmented heating system

Abstract

The utility model belongs to the technical field of coke ovens, and particularly relates to a coke oven with a duplex symmetrical flame path structure and an external adjustable sectional heating system. According to the coke oven, the interior of an existing combustion chamber is mainly divided into a plurality of vertical flame paths through homodromous airflow partition walls and heterodromous airflow partition walls which are arranged in a staggered mode, spanning holes and circulating holes are formed in the heterodromous airflow partition walls, and combustion-supporting air channels and lean gas channels are arranged in the homodromous airflow partition walls. A plurality of sections of combustion-supporting air outlets and a plurality of sections of lean gas outlets which are communicated with the two channels are symmetrically formed in the two sides of the same-direction airflow partition wall, so that communication with two adjacent vertical flame paths is realized, and the duplex symmetrical flame path structure is pioneered in domestic coke ovens of the same type. According to the utility model, the amount of gas or air entering each section of the combustion chamber is directly adjusted from the outside of the coke oven, the airflow distribution in the combustion chamber of the coke oven is more uniform due to the reasonable section layout, the accurate control of airflow distribution is realized, the heating uniformity in the height direction of the coke oven is obviously improved, and the nitrogen oxide content in waste gas is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of coke ovens, and in particular relates to a coke oven with a double-connected symmetrical fire channel structure and an externally adjustable segmented heating system. Background Art

[0002] As an indispensable raw material in the ironmaking process, the energy consumption and pollution issues in the production process of coke have always attracted widespread attention. Traditional coke oven technology is considered to be a production device that puts great pressure on the environment due to its high energy consumption and high pollution characteristics. However, with the continuous advancement of science and technology and the improvement of environmental awareness, coke oven technology has made significant improvements and is developing in the direction of green, high efficiency and low pollution.

[0003] As the core device of the coking plant, the coke oven accounts for a significant proportion of the investment in the entire project, and its design service life is relatively long. Therefore, the design of the coke oven body structure is crucial, which is not only related to the overall investment benefits of the coking plant, but also directly affects the production efficiency and quality of coke. With the development of large-scale coke ovens, the complexity and diversity of the furnace structure have also increased, and the types and quantity of refractory bricks have increased significantly, which has not only increased the construction cost of the coke oven, but also put forward higher requirements on the stability and durability of the furnace structure.

[0004] The coke oven structure is usually composed of a regenerator, a ramp area, a combustion chamber (carbonization chamber) and a furnace top area. The carbonization chamber is the main place for coke oven heating and coal distillation. As the height of the coke oven carbonization chamber increases, how to ensure that the heat from the combustion of coke oven gas can be evenly distributed to the coal becomes the key to ensuring the quality and output of coke. The high-direction heating technology of the coke oven, that is, ensuring the uniformity of the temperature distribution in the height direction of the coke oven combustion chamber, is an important means to achieve this goal.

[0005] However, although the traditional coke oven segmented heating technology has solved the high-direction heating problem of large coke ovens to a certain extent, the complexity of the segmented structure has led to complex coke oven bricks and reduced furnace structural strength. In addition, it is difficult to accurately control the amount of gas and air in each segment in actual operation, which affects the high-direction heating effect of the coke oven. In addition, due to the high temperature environment inside the coke oven, it becomes extremely difficult to move the regulating bricks after production, which further increases the difficulty of high-direction heating control of the coke oven, and may cause local high-temperature accidents in the coke oven and increase the emission concentration of NOx.

[0006] How to propose a new type of coke oven combustion chamber segmented structure, based on the optimized coke oven structure, by externally adjusting the amount of gas or air entering each section of the combustion chamber, improve the uniformity and stability of the coke oven's high-direction heating, reduce NOx emissions, and provide new ideas and methods for the green development and technological progress of the coking industry. Utility Model Content

[0007] In order to solve the problem of high-direction heating of large coke ovens and the problem that the gas and air volume of segmented structures cannot be adjusted, we analyzed the existing coke oven structure and redesigned the combustion chamber structure, combined the optimized new coke oven structure with the actual transformation implementation, and this utility model provides a coke oven with a double-connected symmetrical fire channel structure and an externally adjustable segmented heating system.

[0008] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a coke oven with a double-linked symmetrical fire channel structure, comprising a carbonization chamber, a combustion chamber and a heat storage chamber, the combustion chamber is located on both sides of the carbonization chamber, the heat storage chamber is located directly below the carbonization chamber, the combustion chamber is divided into a plurality of vertical fire channels by partition walls, the partition walls are divided into two types: unidirectional airflow partition walls and heterodirectional airflow partition walls, and the two are arranged in a staggered manner, and every two vertical fire channels form a double-linked vertical fire channel, one of which is for ascending airflow and the other is for descending exhaust gas, and a crossing hole and a circulation hole are respectively arranged at the top and the bottom of the heterodirectional airflow partition wall, and a combustion-supporting air channel and a lean coal gas channel are respectively arranged in the unidirectional airflow partition wall, and the combustion-supporting air channel and the lean coal gas channel are respectively provided. The two small flues at the lower part of the heat storage chamber are connected to the exhaust gas shutter through small flue connecting pipes, and multiple sections of first combustion-supporting air outlets and multiple sections of first lean coal gas outlets are respectively arranged in the height direction on both sides of the same-direction airflow partition wall according to the height of the carbonization chamber. The multiple sections of the first combustion-supporting air outlets are all connected to the combustion-supporting air channel, and the multiple sections of the first lean coal gas outlets are all connected to the lean coal gas channel. The multiple sections of first combustion-supporting air outlets and the multiple sections of first lean coal gas outlets on both sides of the same-direction airflow partition wall are arranged symmetrically, and the combustion-supporting air channel and the lean coal gas channel located in the same same-direction airflow partition wall are respectively connected to the two adjacent vertical fire channels through the first combustion-supporting air outlet and the first lean coal gas outlet.

[0009] As a further supplement to the above technical solution, a second combustion air outlet and a second lean coal gas outlet are respectively provided at the bottom of the vertical fire channel on both sides of the same-direction airflow partition wall, and both are connected to separate small grids in the heat storage chamber through ramps.

[0010] As a further supplementary explanation of the above technical solution, the second combustion-supporting air outlet and the second lean coal gas outlet are both square channels.

[0011] As a further supplementary explanation of the above technical solution, the first combustion-supporting air outlet and the first lean coal gas outlet have the same structure, and both are narrowed square channels inclined outward.

[0012] As a further supplement to the above technical solution, a rich gas outlet is provided at the bottom of each of the vertical fire channels. The rich gas outlet, the second combustion air outlet and the second lean gas outlet in the same vertical fire channel are arranged in a triangle. The elevation of the rich gas outlet exceeds the position of the circulation hole to prevent the rich gas supply from short-circuiting due to low temperature or excessive suction in the burner fire channel.

[0013] As a further explanation and limitation of the above technical solution, the asymmetric airflow partition wall is a solid wall, so as to ensure that the ultimate side load of the furnace wall is increased, thereby improving the structural strength of the furnace body.

[0014] As a further supplement to the above technical solution, the first combustion air outlet, the first lean coal gas outlet, the second combustion air outlet and the second lean coal gas outlet are respectively provided with adjustment bricks, and the adjustment bricks adjust the flow cross-sectional area of ​​the outlet by moving.

[0015] As a further supplement to the above technical solution, a nozzle adjustment plate is arranged on the upper part of the small flue in the heat storage chamber, and the amount of gas entering each small grid of the heat storage chamber is adjusted by adjusting the cross-section of the nozzle hole, so as to control the longitudinal airflow distribution.

[0016] As a further supplement to the above technical solution, flame regulating bricks and ox tongue bricks are provided at each of the ramp outlets, and the position of the contact point between gas and air is adjusted by replacing flame regulating bricks of different thicknesses and heights; and the amount of air entering the vertical fire channel is adjusted by moving or replacing ox tongue bricks of different thicknesses.

[0017] An externally adjustable segmented heating system comprises a coke oven with a double-connected symmetrical fire channel structure in the above scheme, each rich gas outlet passes through a heat storage chamber through a gas pipe brick and is connected to the coke oven gas main pipe through a coke oven gas branch pipe, a first regulating orifice plate is arranged on each of the coke oven gas branch pipes, the small flue connecting pipe is connected to the lean gas main pipe through a lean gas branch pipe, and a second regulating orifice plate is arranged on the lean gas branch pipe.

[0018] Compared with the existing coke oven with double-fired section heating structure, the utility model has the following advantages:

[0019] 1. Optimize airflow distribution and improve thermal efficiency: The utility model adopts a double-linked symmetrical structure design, and the same channel supplies gas or discharges exhaust gas to two adjacent fire channels, realizing the reasonable layout of segmented combustion air channels and lean coal gas channels. This design makes the airflow distribution in the coke oven combustion chamber more uniform, improves the high-direction heating uniformity of the coke oven and reduces the nitrogen oxide content of the exhaust gas. At the same time, the coke oven combustion chamber structure of the double-linked symmetrical fire channel is the first of its kind in the domestic coke ovens of the same type, and all indicators have achieved the expected results, providing new technology for the development of the coking industry.

[0020] 2. Enhance the strength of the furnace structure and extend its service life: The utility model adopts a solid wall structure design for all the different airflow partition walls, which effectively increases the ultimate side load of the furnace body and improves the structural strength of the furnace body. During the coking production process, this design can resist the strong side pressure generated by coal expansion and coke pushing, thereby significantly extending the service life of the furnace body.

[0021] 3. Simplify brick structure and reduce construction cost: This utility model reduces the complexity and types of refractory bricks by reducing the number of brick structures used in coke ovens, thereby reducing the investment cost of the project. This design not only simplifies the construction process, but also reduces the subsequent maintenance costs, bringing tangible economic benefits to coking enterprises.

[0022] 4. Strong adaptability and wide application: The coke oven combustion chamber structure designed by the utility model is suitable for both lean gas heating and rich gas heating. This design enables the coke oven to be applicable to various coking production scenarios, providing more options for coking enterprises.

[0023] 5. External adjustment, easy to control combustion temperature: The utility model significantly improves the uniformity of high-direction heating of large coke ovens by directly adjusting the amount of gas or air entering each section of the combustion chamber from the outside of the coke oven, thereby optimizing the production efficiency of the coke oven. Compared with the traditional coke oven adjustment method, there is no need to move the adjustment bricks under high temperature conditions, making the operation simpler and faster. At the same time, the accuracy of external adjustment not only saves the amount of gas required for coke oven heating, but also helps to improve the quality of coke. More importantly, through more precise temperature control, it can help reduce the generation of NOx, reduce environmental pollution, and effectively avoid local high temperatures, thereby significantly extending the service life of the coke oven. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a structural elevation diagram of the coke oven of the utility model;

[0025] Figure 2 for Figure 1 Plan view of the middle AA section;

[0026] Figure 3 It is an elevation view of the segmented structure of the combustion chamber of the coke oven of the utility model;

[0027] Figure 4 for Figure 3 Plan view of the AA section.

[0028] In the figure: the combustion chamber is 1, the heat storage chamber is 2, the partition wall is 3, the co-directional airflow partition wall is 301, the counter-directional airflow partition wall is 302, the vertical fire channel is 4, the crossing hole is 5, the circulation hole is 6, the combustion air channel is 7, the lean gas channel is 8, the ramp is 9, the small flue is 10, the small smoke connecting pipe is 11, the first combustion air outlet is 12, the first lean gas outlet is 13, the second combustion air outlet is 14, the second lean gas outlet is 15, the rich gas outlet is 16, the gas pipe brick is 17, the coke oven gas branch pipe is 18, the coke oven gas main pipe is 19, the first regulating orifice plate is 20, the lean gas branch pipe is 21, the lean gas main pipe is 22, and the second regulating orifice plate is 23. DETAILED DESCRIPTION

[0029] In order to further illustrate the technical solution of the utility model, the following Figures 1 to 4 According to the on-site construction schemes of the lean gas heating coke oven and the rich gas heating coke oven, we further illustrate the utility model through two embodiments. Embodiment 1

[0030] As attached Figures 1 to 4As shown, a coke oven with a double-linked symmetrical fire channel structure is suitable for lean gas heating. The coke oven structure mainly includes a carbonization chamber, a combustion chamber 1 and a heat storage chamber 2. The combustion chamber 1 is located on both sides of the carbonization chamber, and the heat storage chamber 2 is located directly below the carbonization chamber. The combustion chamber 1 is divided into a plurality of vertical fire channels 4 by a partition wall 3. The partition wall 3 is divided into two types: a unidirectional airflow partition wall 301 and a heterodirectional airflow partition wall 302. The two are arranged in a staggered manner. Every two vertical fire channels 4 form a double-linked vertical fire channel, in which one vertical fire channel 4 carries an ascending airflow, and the other vertical fire channel 4 carries a descending exhaust gas. A crossing hole 5 and a circulation hole 6 are respectively provided at the top and bottom of the heterodirectional airflow partition wall 302. A combustion-supporting air channel 7 and a lean gas channel 8 are respectively provided in the unidirectional airflow partition wall 301. The combustion-supporting air channel 7 and the lean gas channel 8 are respectively connected to the separate small grids in the heat storage chamber 2 through ramps 9. The two small flues 10 at the lower part of the heat storage chamber 2 are connected to the exhaust gas shutter through the small flue connecting pipe 11, and on both sides of the co-directional airflow partition wall 301, multiple sections of first combustion-supporting air outlets 12 and multiple sections of first lean coal gas outlets 13 are respectively arranged in the height direction according to the height of the carbonization chamber. The multiple sections of the first combustion-supporting air outlets 12 are all connected to the combustion-supporting air channel 7, and the multiple sections of the first lean coal gas outlets 13 are all connected to the lean coal gas channel 8. The multiple sections of first combustion-supporting air outlets 12 and the multiple sections of first lean coal gas outlets 13 on both sides of the co-directional airflow partition wall 301 are respectively arranged symmetrically, and the combustion-supporting air channel 7 and the lean coal gas channel 8 located in the same co-directional airflow partition wall 301 are respectively connected to the two adjacent vertical fire channels 2 through the first combustion-supporting air outlet 12 and the first lean coal gas outlet 13. At the same time, the bottom of the vertical fire channel on both sides of the same-direction airflow partition wall 301 is respectively provided with a second combustion air outlet 14 and a second lean coal gas outlet 15, and the two are respectively connected to the separate small grids in the heat storage chamber through ramps. At the same time, the first combustion air outlet 12, the first lean coal gas outlet 13, the second combustion air outlet 14 and the second lean coal gas outlet 15 are respectively provided with adjustment bricks, and the adjustment bricks are moved to adjust the flow cross-sectional area of ​​the outlet.

[0031] Furthermore, a nozzle adjustment plate is provided on the upper part of the small flue 10 in the heat storage chamber 2, and the amount of gas entering each small grid of the heat storage chamber is adjusted by adjusting the cross section of the nozzle hole instead of adjusting the cross section of the inclined channel, so as to control the longitudinal airflow distribution.

[0032] Furthermore, flame regulating bricks and tongue bricks are provided at the outlet of each of the ramps 9. The position of the contact point between gas and air can be adjusted by replacing flame regulating bricks of different thicknesses and heights; the amount of air entering the vertical fire channel 4 can be adjusted by moving or replacing tongue bricks of different thicknesses.

[0033] In this embodiment, the asymmetric airflow partition wall 302 is a solid wall, so as to increase the ultimate side load of the furnace wall and thus improve the structural strength of the furnace body. The second combustion air outlet 14 and the second lean coal gas outlet 15 are both square channels. The first combustion air outlet 12 has the same structure as the first lean coal gas outlet 13, and both are narrowed square channels inclined outward.

[0034] In the process of coke oven heating, when lean coal gas (or mixed coal gas) is selected as the heating medium, the entire heating process is as follows:

[0035] 1. Coke oven heating process: When the coke oven is heated by lean coal gas, the lean coal gas first enters through the small flue on the gas side, then passes through the regenerator to exchange heat with the checker bricks, and finally enters the combustion chamber through the ramp. At the same time, the air also passes through the small flue on the air side, the air regenerator, and the ramp, and finally meets the lean coal gas in the combustion chamber.

[0036] 2. In the small flue at the bottom of the regenerator, we specially designed a small partition wall, which can divide the air regenerator and the gas regenerator into two compartments. When the lean gas and air sent from the external pipeline enter the small flue, they will also be separated into two streams, and then evenly distributed along the length and enter the upper part of the regenerator.

[0037] 3. When passing through the regenerator, the lean gas and air exchange heat with the checker bricks and flow into the ramp area from the top of the regenerator. The ramp area is equipped with channels corresponding to the outlets of each section of the combustion chamber to ensure that the preheated lean gas and air can accurately enter each section of the combustion chamber.

[0038] 4. Lean coal gas and air are burned in each section of the vertical flue. Specifically, the lean coal gas and air of the first section are burned above the first section outlet at the bottom of the vertical flue, while the lean coal gas and air of sections 2 to 5 are burned above the corresponding outlet sides. This design ensures uniform high-side temperature in the combustion chamber.

[0039] 5. During the production process, if the temperature of a certain section of the vertical flue is found to be too low, we can increase the supply of gas and air in the corresponding small flue through external regulation, thereby increasing the heat input of the section and raising the temperature. Conversely, if the temperature of a certain section is too high, reduce the amount of gas and air in the corresponding small flue.

[0040] 6. For coke ovens with only air segmentation, the air regenerator is designed with grids, but the gas regenerator is not. In this case, all lean gas enters the combustion chamber from one stage, and the temperature is mainly adjusted by adjusting the air supply.

[0041] In the above implementation process, the exhaust gas switch ventilation operation is as follows: the exhaust gas pull bar directly lifts the exhaust gas disc through the chain and the lifting rod. The exhaust gas switch is mainly composed of a cylinder, a disc, two forks and a flue connection pipe. The two forks are connected to the small flue of the air heat storage chamber and the small flue of the gas heat storage chamber through the small flue connection pipe. There are two dampers on the two forks, which are connected to the small flue of the air heat storage chamber and the small flue of the gas heat storage chamber respectively. The opening and closing of the damper is driven by the small chain of the exhaust gas pull bar. The division of the small flue connection pipe corresponds to the small flue and the heat storage chamber. The small flue connection pipe is provided with an adjustment flap. When the damper falls and the disc in the cylinder is fully lifted, the exhaust gas in the heat storage chamber is introduced into the sub-flue. The exhaust gas volume is adjusted by the adjustment flap. When the coke oven is heated with coke oven gas, the two dampers are connected to the small chain of the exhaust gas pull bar, and the two dampers are opened and closed together according to the exchange program action. When the corresponding heat storage chamber is in the ascending airflow, both the two discs fall down, and both the two dampers of the two forks are opened, thereby letting in the heating air. The amount of air can be adjusted by changing the cross-sectional area of ​​the damper inlet, and the amount of air entering each section of the vertical fire channel is achieved through the adjustment flap on the small flue connecting pipe. When heating with mixed gas, only open the damper on one of the two forks to let in air, and lock the damper on the fork with the lean gas connecting pipe. The lean gas enters the small flue of the gas heat storage chamber through the lean gas connecting pipe and the two forks, and the amount of lean gas entering each section of the vertical fire channel is also achieved through the adjustment flap on the small flue connecting pipe. Embodiment 2

[0042] As shown in Attachments 1 and 2, the coke oven is suitable for rich gas heating. On the basis of the coke oven combustion chamber structure of the above-mentioned embodiment 1, we can choose to only provide a combustion air channel 5 in the co-directional airflow partition wall 102; or keep other structures unchanged and let all lean gas outlets pass through combustion air. In addition, we provide a rich gas outlet 16 at the bottom of each of the vertical fire channels 4. The rich gas outlet 16, the second combustion air outlet 14, and the second lean gas outlet 15 in the same vertical fire channel 4 are arranged in a triangle. The elevation of the rich gas outlet 16 exceeds the position of the circulation hole 6 to prevent the rich gas supply from being short-circuited due to low temperature or excessive suction in the furnace head fire channel.

[0043] In the process of coke oven heating, when rich coal gas is selected as the heating medium, the whole heating process is as follows:

[0044] 1. The rich gas is transported to the gas pipe bricks through the coke oven gas main, and then directly enters the bottom of the vertical fire channel of the combustion chamber (i.e. the first stage outlet).

[0045] 2. At the same time as the rich gas enters the combustion chamber, air enters through the small flues on the air / gas side. These small flues on the air / gas side are carefully designed, including small partitions that separate the small flues on the air side and the small flues on the gas side into two independent parts. After entering the small flues, the ambient air is divided into four streams and then distributed along the length to enter the upper part of the regenerator.

[0046] 3. In the regenerator, the air is preheated by contacting the checker bricks. The preheated air enters the ramp area from the top of the regenerator. The ramp area is provided with channels corresponding to the outlets of each section of the combustion chamber, so that the preheated air can enter the first section and the second to fifth sections of the combustion chamber through these channels.

[0047] 4. In the combustion chamber, the rich gas first undergoes incomplete combustion with the air in the first stage. The remaining gas after combustion continues to rise and continues to burn after mixing with the air supplied from the second to fifth stage outlets.

[0048] 5. In order to keep the temperature of the combustion chamber stable, the air supply needs to be finely adjusted. When the temperature of the first section of the combustion chamber is too low, the air supply of the corresponding small flue can be increased through the adjustment flap on the small flue connecting pipe, so that the gas combustion point moves down, thereby increasing the temperature of the first section. On the contrary, when the temperature of the first section is too high, the air supply of the corresponding small flue can also be reduced through the adjustment flap of the small flue connecting pipe, so that the gas combustion point moves up and the temperature of the first section is reduced. The same adjustment method is also applicable to the second to fifth sections of the combustion chamber.

[0049] Such a heating process ensures the stable operation and efficient heating of the coke oven, while also ensuring the safety and environmental protection of the production process.

[0050] As shown in Attachment 1, an externally adjustable segmented heating system includes a coke oven with a double-connected symmetrical fire channel structure according to the above two embodiments, each rich gas outlet 16 passes through the regenerator through a gas pipe brick 17 and is connected to the coke oven gas main pipe 19 through a coke oven gas branch pipe 18, a first regulating orifice plate 20 is provided on each of the coke oven gas branch pipes 18, the small smoke connecting pipe 11 is connected to the lean gas main pipe 22 through a lean gas branch pipe 21, and a second regulating orifice plate 23 is provided on the lean gas branch pipe 21.

[0051] In the above two embodiments, the exhaust gas after combustion descends from the even-numbered vertical fire channel connected to the odd-numbered fire channel through the crossing hole, enters the even-numbered exhaust gas shutter through each small grid of the even-numbered heat storage chamber, and then passes through the branch flue and the main flue, and is finally discharged into the atmosphere from the chimney.

[0052] In summary, the furnace structure is suitable for coke ovens heated by lean coal gas (or mixed coal gas) and rich coal gas. The furnace structure is suitable for coke ovens with only air supply in sections or only coal gas supply in sections, as well as coke ovens with both air and coal gas supply in sections. It should be noted that the furnace structure is suitable for coke ovens with a carbonization chamber height of 5 to 10 meters. The furnace structure is suitable for coke ovens with 2 to 5 sections of combustion chamber. The furnace structure is suitable for coke ovens with 20 to 50 vertical flues in the combustion chamber. The furnace structure is suitable for coke ovens with a single-sided flue or double-sided flue.

[0053] The above shows and describes the main features and advantages of the utility model. For those skilled in the art, it is obvious that the specific implementation of the utility model is not limited to the details of the above exemplary embodiments, and the creative ideas and design ideas of the utility model can be realized in other specific forms without departing from the spirit or basic features of the utility model, which should be equivalent to the protection scope disclosed in the technical solution of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is limited by the attached claims rather than the above description, so it is intended to include all changes that fall within the meaning and scope of the equivalent elements of the claims in the utility model.

[0054] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A coke oven with a double-linked symmetrical fire channel structure, comprising a carbonization chamber, a combustion chamber (1) and a regenerator (2), wherein the combustion chamber (1) is located on both sides of the carbonization chamber, and the regenerator (2) is located directly below the carbonization chamber. The combustion chamber (1) is divided into a plurality of vertical fire channels (4) by a partition wall (3), and each two vertical fire channels (4) form a double-linked vertical fire channel, wherein one vertical fire channel (4) carries an ascending airflow, and the other vertical fire channel (4) carries a descending exhaust gas. Two small flues (10) at the bottom of the regenerator (2) are connected to an exhaust gas switch via a small flue connecting pipe (11), and the characteristics are as follows: The partition wall (3) is divided into two types: a co-directional airflow partition wall (301) and a counter-directional airflow partition wall (302), and the two are arranged in a staggered manner. A crossing hole (5) and a circulation hole (6) are respectively arranged at the top and the bottom of the counter-directional airflow partition wall (302). A combustion-supporting air channel (7) and a lean coal gas channel (8) are respectively arranged in the co-directional airflow partition wall (301). The combustion-supporting air channel (7) and the lean coal gas channel (8) are respectively connected to the separate small cells in the heat storage chamber (2) through ramps (9). A plurality of first combustion-supporting air outlets (11) are respectively arranged on both sides of the co-directional airflow partition wall (301) according to the height of the carbonization chamber. 2) and multiple first lean coal gas outlets (13), the multiple first combustion-supporting air outlets (12) are all connected to the combustion-supporting air channel (7), the multiple first lean coal gas outlets (13) are all connected to the lean coal gas channel (8), the multiple first combustion-supporting air outlets (12) and the multiple first lean coal gas outlets (13) located on both sides of the co-directional airflow partition wall (301) are arranged symmetrically, and the combustion-supporting air channel (7) and the lean coal gas channel (8) located in the same co-directional airflow partition wall (301) are respectively connected to the two adjacent vertical fire channels (4) through the first combustion-supporting air outlet (12) and the first lean coal gas outlet (13).

2. The coke oven with a double symmetrical fire channel structure according to claim 1, characterized in that: A second combustion-supporting air outlet (14) and a second lean coal gas outlet (15) are respectively provided at the bottom of the vertical fire channel on both sides of the co-directional airflow partition wall (301), and the two outlets are respectively connected to separate small cells in the heat storage chamber through inclined channels.

3. The coke oven with a double symmetrical fire channel structure according to claim 2, characterized in that: The second combustion-supporting air outlet (14) and the second lean coal gas outlet (15) are both square channels.

4. A coke oven with a double symmetrical fire channel structure according to any one of claims 1 to 3, characterized in that: The first combustion-supporting air outlet (12) and the first lean coal gas outlet (13) have the same structure, and both are narrowed square channels inclined outwards.

5. The coke oven with a double symmetrical fire channel structure according to claim 4, characterized in that: A rich gas outlet (16) is provided at the bottom of each of the vertical fire channels (4). The rich gas outlet (16) and the second combustion air outlet (14) and the second lean gas outlet (15) located in the same vertical fire channel (4) are arranged in a triangle. The elevation of the rich gas outlet (16) exceeds the position of the circulation hole (6) to prevent the rich gas supply from being short-circuited due to low temperature or excessive suction in the burner fire channel.

6. A coke oven with a double symmetrical fire channel structure according to any one of claims 1 to 3 or 5, characterized in that: The different-direction airflow partition wall (302) is a solid wall, thereby ensuring that the ultimate side load of the furnace wall is increased, thereby improving the structural strength of the furnace body.

7. The coke oven with a double symmetrical fire channel structure according to claim 6, characterized in that: Adjustment bricks are respectively arranged on the first combustion air outlet (12), the first lean coal gas outlet (13), the second combustion air outlet (14) and the second lean coal gas outlet (15), and the adjustment bricks are moved to adjust the flow cross-sectional area of ​​the outlets.

8. The coke oven with a double symmetrical fire channel structure according to claim 7, characterized in that: A nozzle adjustment plate is provided at the upper part of the small flue (10) in the heat storage chamber (2), and the amount of gas entering each small cell of the heat storage chamber is adjusted by adjusting the cross section of the nozzle hole, thereby controlling the airflow distribution in the longitudinal direction.

9. The coke oven with a double symmetrical fire channel structure according to claim 8, characterized in that: At the outlet of each inclined channel (9), a flame regulating brick and a tongue brick are provided. The position of the contact point between gas and air is adjusted by replacing the flame regulating bricks of different thicknesses and heights; and the amount of air entering the vertical fire channel (4) is adjusted by moving or replacing the tongue bricks of different thicknesses.

10. An externally adjustable segmented heating system, characterized in that: A coke oven with a double symmetrical fire channel structure as claimed in any one of claims 5 to 9, wherein each rich gas outlet (16) passes through a heat storage chamber via a gas pipe brick (17) and is connected to a coke oven gas main pipe (19) via a coke oven gas branch pipe (18), a first regulating orifice plate (20) is provided on each of the coke oven gas branch pipes (18), the small flue connecting pipe (11) is connected to a lean gas main pipe (22) via a lean gas branch pipe (21), and a second regulating orifice plate (23) is provided on the lean gas branch pipe (21).

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