Coke oven combustion chamber structure with duplex symmetrical flame path structure

Abstract

The utility model belongs to the technical field of coke ovens, and particularly relates to a coke oven combustion chamber structure with a duplex symmetrical flame path structure. The interior of the coke oven combustion chamber is 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, crossing holes and circulating holes are formed in the heterodromous airflow partition walls, combustion-supporting air channels and lean gas channels are arranged in the homodromous airflow partition walls, and the combustion-supporting air channels and the lean gas channels are communicated with regenerative chamber cells through chutes respectively. Meanwhile, multiple sections of combustion-supporting air outlets and multiple sections of lean gas outlets which are communicated with the two channels are formed in the two sides of the same-direction airflow partition wall respectively in the height direction, and accurate control over airflow distribution is achieved. According to the utility model, through the structural design of the duplex symmetrical flame paths, the same channel supplies the gas of the two adjacent flame paths and is initiative in the same type of domestic coke ovens, and the segmented reasonable layout enables the gas flow distribution in the combustion chamber of the coke oven to be more uniform, so that the heating uniformity in the height direction of the coke oven is improved, and the nitrogen oxide content in the waste gas is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of coke ovens, and particularly relates to a coke oven combustion chamber structure with a double-connected symmetrical flue structure. Background Art

[0002] As the core equipment of a coking plant, the coke oven body is carefully built with various refractory bricks. Its investment accounts for as high as 30% to 40% of the entire project. Taking a 2-million-ton coking unit as an example, the investment in the coke oven and its supporting facilities is as high as 700 million to 900 million yuan. Moreover, the designed service life of the coke oven generally exceeds 25 years, which means that the rationality of its furnace body structure is decisive for the return on investment of the entire project. Among them, the combustion chamber, as the core part, is not only the place where gas burns but also the key area where coal materials are heated and carbonized.

[0003] With the enlargement of the coke oven, the height of the carbonization chamber can even reach 10 meters. How to ensure that the heat generated by the combustion of coke oven gas can be evenly distributed to the coal materials and ensure that all coal materials can be converted into coke on time has become an urgent technical problem to be solved, that is, the problem of high-level heating.

[0004] For this reason, the sectional heating technology of the coke oven combustion chamber has emerged as the times require and has become the main strategy to solve the high-level heating of large coke ovens. However, the introduction of the sectional heating structure has also brought challenges such as the complication of coke oven brick types and the decline of the furnace body structure strength. With the continuous expansion of the coke oven scale, to meet the requirements of its structure strength and gas flow channels, there are more than a thousand types of refractory bricks for large coke ovens, which undoubtedly increases the cost of the coke oven. Therefore, the research and development of the furnace body structure must be rigorous and prudent. From the initial concept to the mature application, it often requires years of painstaking research and continuous improvement. A reasonable furnace body structure design is particularly important and can effectively control and reduce the overall cost. Content of the Utility Model

[0005] Aiming at the many technical challenges existing in the research on the problem of high-level heating in the transformation of the sectional heating structure of the coke oven combustion chamber in the background art, the utility model provides a coke oven combustion chamber structure with a double-connected symmetrical flue structure.

[0006] To achieve the above object, the present utility model adopts the following technical solutions: A coke oven combustion chamber structure with double-connected symmetric flues. The interior of the coke oven combustion chamber is divided into multiple vertical flues by partition walls. Every two vertical flues form a double-connected vertical flue. The partition walls are divided into two types: co-directional gas flow partition walls and counter-directional gas flow partition walls, and the two are arranged alternately. A crossover hole and a circulation hole are respectively arranged at the top and bottom of the counter-directional gas flow partition wall. A combustion-supporting air channel and a lean gas channel are respectively arranged in the co-directional gas flow partition wall. The combustion-supporting air channel and the lean gas channel are respectively connected to separate small cells in the regenerator through ramps. On both sides of the co-directional gas flow partition wall, multiple sections of first combustion-supporting air outlets and multiple sections of first lean gas outlets are respectively arranged along the height direction according to the height of the carbonization chamber. Multiple sections of the first combustion-supporting air outlets are all connected to the combustion-supporting air channel, and multiple sections of the first lean gas outlets are all connected to the lean gas channel.

[0007] As a further supplementary description of the above technical solution, the multiple sections of first combustion-supporting air outlets and multiple sections of first lean gas outlets located on both sides of the co-directional gas flow partition wall are respectively arranged symmetrically. The combustion-supporting air channel and the lean gas channel located in the same co-directional gas flow partition wall are connected to two adjacent vertical flues.

[0008] As a further supplementary description of the above technical solution, second combustion-supporting air outlets and second lean gas outlets are respectively arranged at the bottoms of the vertical flues on both sides of the co-directional gas flow partition wall, and the two are respectively connected to separate small cells in the regenerator through ramps.

[0009] As a further supplementary description of the above technical solution, a rich gas outlet is arranged at the bottom of each vertical flue. The elevation of the rich gas outlet exceeds the position of the circulation hole to prevent short-circuit of rich gas supply due to low temperature or excessive suction in the furnace head flue. Each rich gas outlet is connected to the coke oven gas pipe through a rich gas channel after passing through the regenerator.

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

[0011] As a further supplementary description of the above technical solution, regulating bricks are respectively arranged on the first combustion-supporting air outlet, the first lean gas outlet, the second combustion-supporting air outlet, and the second lean gas outlet. The regulating bricks are moved to adjust the cross-sectional area of the outlet.

[0012] As a further explanation and limitation of the above technical solution, the rich gas outlet, the second combustion-supporting air outlet, and the second lean gas outlet located in the same vertical flue are arranged in a triangle.

[0013] As a further supplementary description of the above technical solution, the structures of the first combustion-supporting air outlet and the first lean gas outlet are the same, and both are narrowing square channels that slope outward.

[0014] As a further explanation and limitation of the above technical solution, the counter-flow air partition wall is a solid wall, which ensures an increase in the ultimate side load of the furnace wall and thus improves the structural strength of the furnace body.

[0015] Compared with the combustion chambers of the existing double-flue segmented heating structures, the double-flue symmetric structure coke oven combustion chamber designed by the present utility model has the following advantages:

[0016] 1. Optimize air flow distribution and improve thermal efficiency: Through the double-flue symmetric structure design of the present utility model, the gas in the same channel supplies adjacent two flues, realizing a reasonable layout of the segmented combustion-supporting air channels and lean gas channels, and ensuring the gas supply to adjacent two flues within the co-directional air partition wall. This design makes the air flow distribution in the coke oven combustion chamber more uniform, improves the vertical heating uniformity of the coke oven and reduces the content of waste gas nitrogen oxides. At the same time, the coke oven combustion chamber structure with this double-flue symmetric flue is a pioneer among the same type of coke ovens in China, and all indicators have achieved the expected results, providing new technologies for the development of the coking industry.

[0017] 2. Enhance the structural strength of the furnace body and extend the service life: The present utility model designs all the counter-flow air partition walls with a solid wall structure, effectively increasing the ultimate side load of the furnace body and improving the structural strength of the furnace body. During the coking production process, this design can resist the strong side pressure generated by the coal material expansion and coke pushing, thus significantly extending the service life of the furnace body.

[0018] 3. Simplify the brick type structure and reduce the construction cost: By reducing the number of brick type structures used in the coke oven, the present utility model reduces the complexity and types of refractory bricks, thereby reducing the investment cost of the project. This design not only simplifies the construction process but also reduces the later maintenance cost, bringing real economic benefits to coking enterprises.

[0019] 4. Strong adaptability and wide application: The coke oven combustion chamber structure designed by the present utility model is applicable to both lean gas heating mode and rich gas heating mode. This design enables the coke oven to be applicable to various coking production scenarios, providing more choice spaces for coking enterprises. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is the elevation view of the segmented structure of the coke oven combustion chamber in the present utility model;

[0021] Figure 2 is Figure 1 the plan view of the A-A section in

[0022] In the figure: the partition wall is 1, the counter-flow partition wall is 101, the co-flow partition wall is 102, the flue is 2, the crossover hole is 3, the circulation hole is 4, the combustion air passage is 5, the lean gas passage is 6, the first combustion air outlet is 7, the first lean gas outlet is 8, the second combustion air outlet is 9, the second lean gas outlet is 10, and the rich gas outlet is 11. Specific embodiments

[0023] In order to further elaborate on the technical solution of the present invention, the following combines the attached Figure 1 and 2 , and according to the on-site construction plan, the present invention is further described through two embodiments. Embodiment 1

[0024] As shown in FIGS. 1 and 2, the coke oven combustion chamber structure is suitable for lean gas heating. A coke oven combustion chamber structure with double-connected symmetric flues, the interior of the coke oven combustion chamber is divided into multiple flues 2 by a partition wall 1, and every two flues 2 form a double-connected flue. The partition wall 1 is divided into two types: co-flow partition wall 102 and counter-flow partition wall 101, and the two are arranged alternately. Crossover holes 3 and circulation holes 4 are respectively arranged at the top and bottom of the counter-flow partition wall 101. The counter-flow partition wall 101 is a solid wall, so as to ensure an increase in the ultimate side load of the furnace wall and thus improve the structural strength of the furnace body. A combustion air passage 5 and a lean gas passage 6 are respectively arranged in the co-flow partition wall 102. The combustion air passage 5 and the lean gas passage 6 are respectively connected to separate small cells in the regenerator through ramps. Along the height direction according to the height of the carbonization chamber, multiple sections of first combustion air outlets 7 and multiple sections of first lean gas outlets 8 are respectively arranged on both sides of the co-flow partition wall 102. Multiple sections of the first combustion air outlets 7 are all connected to the combustion air passage 5, and multiple sections of the first lean gas outlets 8 are all connected to the lean gas passage 6, that is, multiple sections of the first combustion air outlets 7 and multiple sections of the first lean gas outlets 8 located on both sides of the co-flow partition wall 102 are respectively arranged symmetrically. The combustion air passage 5 and the lean gas passage 6 located in the same co-flow partition wall 102 are connected to two adjacent flues 2. In addition, second combustion air outlets 9 and second lean gas outlets 10 are respectively arranged at the bottoms of the flues on both sides of the co-flow partition wall 102, and the two outlets are respectively connected to separate small cells in the regenerator through ramps. At the same time, regulating bricks are respectively arranged on the first combustion air outlet 7, the first lean gas outlet 8, the second combustion air outlet 9, and the second lean gas outlet 10, and the regulating bricks are moved to adjust the flow cross-sectional area of the outlet.

[0025] Further, the structures of the first combustion-supporting air outlet 7 and the first lean coal gas outlet 8 are the same, and both are narrowing square channels that slope outward; the second combustion-supporting air outlet 9 and the second lean coal gas outlet 10 are both square channels.

[0026] In this embodiment, when heating with lean coal gas, the lean coal gas and air enter each small grid of the regenerator through the small flue at the waste gas collector. The gas volume entering each small grid of the regenerator is adjusted by the regulating plate to control the longitudinal gas flow distribution. Therefore, in order to completely adjust the heating of the coke oven at the lower part, it is necessary to divide the regenerator into grids during subsequent construction. Moreover, each small grid of the regenerator is connected to the combustion-supporting air channel and the lean coal gas channel by inclined flues. The second combustion-supporting air outlet and the second lean coal gas outlet at the bottom of each flue are also respectively connected to the separate small grids in the regenerator through inclined flues. A pair of adjacent flues and the connected small grids of the regenerator form a separately controlled minimum heating unit. Each group of combustion-supporting air channels and lean coal gas channels can supply gas for heating two adjacent flues simultaneously. When heating with lean coal gas, the lean coal gas enters the small flue from the waste gas collector, then enters the vertical flue through the regenerator and the inclined flue, and mixes and burns with air at the bottom of the vertical flue. The air enters each small grid of the regenerator from the small flue and enters the combustion chamber through the inclined flue to mix and burn with the lean coal gas; at the same time, the sectional combustion-supporting air and the lean coal gas enter the flue through the combustion-supporting air channel and the lean coal gas channel respectively to mix and burn. During this process, we can control the amount of lean coal gas and air entering by adjusting the opening area of the regulating plate provided between the regenerator and the small flue. Embodiment 2

[0027] As shown in Attachments 1 and 2, the coke oven combustion chamber structure is applicable to heating with rich coal gas. On the basis of the coke oven combustion chamber structure in the above Embodiment 1, we can choose to only have the combustion-supporting air channel 5 in the co-directional gas flow partition wall 102; or keep other structures unchanged and connect all the lean coal gas outlets to the combustion-supporting air. Additionally, a rich coal gas outlet 11 is provided at the bottom of each of the said vertical flues 2. The rich coal gas outlet 11 and the second combustion-supporting air outlet 9 and the second lean coal gas outlet 10 in the same said vertical flue 2 are arranged in a triangle. Each of the said rich coal gas outlets 11 is connected to the coke oven gas pipe through a rich coal gas channel passing through the regenerator.

[0028] Further, the elevation of the rich coal gas outlet 11 exceeds the position of the circulation hole 4. This design prevents the low temperature or excessive suction in the furnace head flue from causing a short circuit in the rich coal gas supply.

[0029] In this embodiment, when heating with coke oven gas, the coke oven gas directly reaches the bottom of the vertical flue through the rich coal gas channel and mixes and burns with air. The air enters each small grid of the regenerator from the small flue and enters the flue through the bottom combustion-supporting air outlet of the inclined flue to mix and burn with the coke oven gas; at the same time, the air enters the flue through the combustion-supporting air channel through the sectional combustion-supporting air outlets to mix and burn with the coke oven gas.

[0030] In the above two embodiments, the combustion exhaust gas descends from the even-numbered vertical flues connected to the odd-numbered flues through the crossover holes, enters each small cell of the even-numbered regenerators, then enters the even-numbered exhaust gas switch regulators, and then passes through the branch flue and the main flue, and finally is discharged into the atmosphere from the chimney.

[0031] The above has shown and described the main features and advantages of the present invention. For those skilled in the art, it is obvious that the specific implementation manners of the present invention are not limited to the details of the above exemplary embodiments. Moreover, without departing from the spirit or basic features of the present invention, the creative ideas and design concepts of the present invention can be implemented in other specific forms, and should be equally regarded as belonging to the protection scope disclosed in the technical solution of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be encompassed within the present invention.

[0032] In addition, it should be understood that although this specification is described according to the embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A coke oven combustion chamber structure with a double symmetrical fire channel structure, wherein the interior of the coke oven combustion chamber is divided into a plurality of vertical fire channels (2) by a partition wall (1), and every two vertical fire channels (2) form a double vertical fire channel, characterized in that: The partition wall (1) is divided into two types: a co-directional airflow partition wall (102) and a counter-directional airflow partition wall (101), and the two are arranged in a staggered manner. A crossing hole (3) and a circulation hole (4) are respectively arranged at the top and the bottom of the counter-directional airflow partition wall (101). A combustion-supporting air channel (5) and a lean coal gas channel (6) are respectively arranged in the co-directional airflow partition wall (102). The combustion-supporting air channel (5) and the lean coal gas channel (6) are respectively connected to separate small cells in the heat storage chamber through inclined channels. A plurality of first combustion-supporting air outlets (7) and a plurality of first lean coal gas outlets (8) are respectively arranged in a height direction on both sides of the co-directional airflow partition wall (102) according to the height of the carbonization chamber. The plurality of first combustion-supporting air outlets (7) are all connected to the combustion-supporting air channel (5), and the plurality of first lean coal gas outlets (8) are all connected to the lean coal gas channel (6).

2. The coke oven combustion chamber structure with a double symmetrical fire channel structure according to claim 1 is characterized in that: The multiple sections of first combustion-supporting air outlets (7) and the multiple sections of first lean coal gas outlets (8) located on both sides of the co-directional airflow partition wall (102) are arranged symmetrically, and the combustion-supporting air channel (5) and the lean coal gas channel (6) located in the same co-directional airflow partition wall (102) are connected to the two adjacent vertical fire channels (2).

3. A coke oven combustion chamber structure with a double symmetrical fire channel structure according to claim 1 or 2, characterized in that: A second combustion-supporting air outlet (9) and a second lean coal gas outlet (10) are respectively provided at the bottom of the vertical fire channel on both sides of the co-directional airflow partition wall (102), and the two outlets are respectively connected to separate small cells in the heat storage chamber through inclined channels.

4. The coke oven combustion chamber structure with a double symmetrical fire channel structure according to claim 3 is characterized in that: A rich gas outlet (11) is provided at the bottom of each vertical fire channel (2). The elevation of the rich gas outlet (11) exceeds the position of the circulation hole (4) to prevent the rich gas supply from being short-circuited due to low temperature or excessive suction in the furnace head fire channel. Each of the rich gas outlets (11) is connected to the coke oven gas pipe after passing through the heat storage chamber through the rich gas channel.

5. The coke oven combustion chamber structure with a double symmetrical fire channel structure according to claim 4 is characterized in that: The second combustion air outlet (9) and the second lean coal gas outlet (10) are both square channels.

6. The coke oven combustion chamber structure with a double symmetrical fire channel structure according to claim 5, characterized in that: Adjustment bricks are respectively arranged on the first combustion air outlet (7), the first lean coal gas outlet (8), the second combustion air outlet (9) and the second lean coal gas outlet (10), and the adjustment bricks are moved to adjust the flow cross-sectional area of ​​the outlets.

7. A coke oven combustion chamber structure with a double symmetrical fire channel structure according to any one of claims 4 to 6, characterized in that: The rich coal gas outlet (11), the second combustion air outlet (9), and the second lean coal gas outlet (10) located in the same vertical fire channel (2) are arranged in a triangle.

8. The coke oven combustion chamber structure with a double symmetrical fire channel structure according to claim 7 is characterized in that: The first combustion-supporting air outlet (7) and the first lean coal gas outlet (8) have the same structure, and both are narrowed square channels inclined outwards.

9. A coke oven combustion chamber structure with a double symmetrical fire channel structure according to any one of claims 1 to 2 or any one of claims 4 to 6 or 8, characterized in that: The different-direction airflow partition wall (101) 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.

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