Clean coke oven vertical flue capable of uniform and diffuse combustion
By setting up an air supply tower and spiral fins in the flue, a spiral airflow channel is formed, which solves the problems of uneven heating and nitrogen oxide generation in the coke oven, and achieves uniform combustion and improved environmental performance of the coke oven.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU ZHONGLEI ENERGY SAVING TECH DEV CO LTD
- Filing Date
- 2025-05-27
- Publication Date
- 2026-07-07
Smart Images
Figure CN224467718U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a clean heat recovery coke oven, and more particularly to an improvement of the vertical flue structure of the clean heat recovery coke oven, which includes a descending flue and an ascending flue. Background Technology
[0002] Clean heat recovery coke ovens can efficiently recover heat energy from coke oven exhaust gas, and the nitrogen oxide content in the combustion exhaust gas of clean heat recovery coke ovens is low, so they can be directly emitted. Therefore, heat recovery coke ovens have significant advantages in heat energy recovery, environmental protection and energy saving, which are unmatched by traditional coke ovens.
[0003] Clean heat recovery coke ovens mainly consist of a carbonization chamber and a combustion chamber. The combustion chamber, which provides heat for coking, mainly includes rising and falling flues located in the partition walls of the carbonization chamber. Currently, most heat recovery coke ovens use wide carbonization chambers for coking, resulting in larger coke pieces and better thermal stability. However, an excessively wide carbonization chamber can affect heat transfer efficiency, prolong coking time, and require a large footprint, leading to high investment costs. While narrowing the coke carbonization chamber can solve the heat transfer problem and reduce the coke oven's footprint, it also increases the height of the carbonization chamber and the length of the rising and falling flues in the main wall. Longer flues directly affect the thermal efficiency of the carbonization chamber walls and easily lead to uneven distribution of combustible raw gas and combustion air in the rising and falling flues. This results in differences in the combustion of raw gas in the rising and falling flues, causing uneven heating of the coke oven and consequently affecting heating efficiency and coke quality. Narrowing the carbonization chamber and lengthening the vertical flue will exacerbate the generation of nitrogen oxides. Due to the lengthening of the vertical flue, localized intense combustion will form within it, creating high-temperature zones. Under high-temperature conditions, nitrogen in the combustion air will react with oxidation to generate thermal nitrogen oxides. Nitrogen oxides are a major source of air pollution. Large emissions of nitrogen oxides will undermine the environmentally friendly characteristics of clean heat recovery coke ovens. The presence of localized high-temperature zones within the vertical flue becomes a major source of pollutants from coke ovens. Utility Model Content
[0004] In view of the above-mentioned shortcomings of the existing technology, the technical problem to be solved by this utility model is to provide a clean coke oven vertical flue that can effectively suppress the generation of nitrogen oxides and reduce the coke oven floor space and can uniformly disperse combustion.
[0005] To solve the above-mentioned technical problems, the present invention provides a clean coke oven vertical flue capable of uniformly diffused combustion, comprising a carbonization chamber main wall, wherein the carbonization chamber is located between two adjacent carbonization chamber main walls, and a vertical flue is arranged along the height direction inside the carbonization chamber main wall, wherein a flue spiral fin is provided on the inner wall surface of the vertical flue; an air supply tower is arranged in the chamber of the vertical flue, wherein an air tower spiral fin is provided on the outer tower surface of the air supply tower, and an air supply hole is arranged between two adjacent air tower spiral fins; an air supply channel is also arranged in the air supply channel, wherein the air supply channel leads to the chamber of the vertical flue through the air supply hole.
[0006] Furthermore, the spiral fins of the wind tower spirally surround the tower body of the wind supply tower, and the spiral fins of the fire channel spirally surround the inner wall surface of the fire channel.
[0007] Furthermore, the spiral air duct formed by the spiral fins of the wind tower on the wind supply tower corresponds to the spiral air duct formed by the spiral fins of the fire channel inside the fire channel.
[0008] Furthermore, the spiral lift of the wind tower spiral duct is equal to the spiral lift of the fire duct spiral duct.
[0009] Furthermore, the vertical fire channel has a square column tube structure; the cross-section of the air supply tower and the air supply channel is rectangular.
[0010] Furthermore, the air supply channel on the air supply tower is a blind hole, the upper end of the air supply channel is a closed end, and the lower end of the air supply channel leads to the air supply port.
[0011] Furthermore, the vertical fire channel includes a descending fire channel and an ascending fire channel, which are located alternately within the main wall of the carbonization chamber.
[0012] In the above structure, because an air supply tower is installed in the chamber of the vertical combustion channel, the air supply tower can evenly deliver the combustion air to all levels of the vertical combustion channel, so that the combustion air can be fully and evenly mixed with the combustible raw coal gas in the vertical combustion channel to form a balanced combustion degree. This avoids the formation of nitrogen oxides in the intense combustion zone in the vertical combustion channel, effectively suppressing the high temperature formed by intense combustion, thereby avoiding the formation of thermal nitrogen oxides. The balanced combustion degree in the vertical combustion channel also makes the coke oven heated evenly, improving the heating efficiency and forming quality of the coke oven. Furthermore, the spiral fins of the air supply tower and the spiral fins of the fire channel form a spiral airflow channel. This spiral airflow channel guides the high-temperature flue gas to flow along a spiral path in the fire channel, causing the high-temperature airflow to form a diffuse combustion state. This not only increases the uniformity of combustion and is beneficial to the quality of coke, but also greatly increases the heat transfer efficiency and improves thermal efficiency due to the spiral flow of the high-temperature airflow. At the same time, the spiral airflow channel guides the high-temperature flue gas to flow along a spiral path in the fire channel, balancing the combustion temperature in the fire channel, disrupting the conditions for nitrogen oxide formation, and avoiding the formation of nitrogen oxides, making coke production cleaner and more environmentally friendly. Moreover, the structure of this invention makes it possible to narrow the coke oven carbonization chamber, which effectively reduces the footprint of the coke oven and saves on the investment cost of coke oven construction. Attached Figure Description
[0013] The following description, in conjunction with the accompanying drawings and specific embodiments, provides a further detailed explanation of the clean coke oven vertical flue capable of uniformly dispersing combustion according to this utility model.
[0014] Figure 1 This is a schematic diagram of a specific embodiment of the clean coke oven vertical flue that can uniformly disperse combustion according to this utility model;
[0015] Figure 2 yes Figure 1 Sectional view A-A;
[0016] Figure 3 yes Figure 2 F-direction view;
[0017] Figure 4 yes Figure 2 Cross-sectional view of the neutral fire channel;
[0018] Figure 5 yes Figure 2 Structural diagram of the China Power Supply Tower;
[0019] Figure 6 yes Figure 5 A sectional view;
[0020] Figure 7 This is a front view of winged refractory bricks used for constructing wind supply towers;
[0021] Figure 8 yes Figure 7 Top view;
[0022] Figure 9 yes Figure 7 The left view;
[0023] Figure 10 This is a front view of perforated refractory bricks used for building wind towers;
[0024] Figure 11 yes Figure 10 B-B cross-section view.
[0025] In the diagram, 1—main wall of the carbonization chamber, 2—air supply tower, 21—spiral fin of the air supply tower, 22—air supply hole, 23—air supply passage, 3—fire passage, 31—spiral fin of the fire passage, 4—carbonization chamber, 5—winged refractory brick, 51—refractory brick fin, 6—perforated refractory brick. Detailed Implementation
[0026] like Figure 1 , Figure 2 The clean-type furnace vertical flue shown includes mutually spaced, vertically spaced carbonization chamber main walls 1, forming a carbonization chamber 4 between two carbonization chamber main walls 1. Several vertical flues 3 are arranged along the height of the carbonization chamber main walls 1. Each vertical flue 3 includes several mutually vertical and parallel descending and ascending flues, which are alternately arranged within the carbonization chamber main walls 1. Alternatively, the descending and ascending flues can be arranged in pairs or triplets alternately within the carbonization chamber main walls 1. The arrangement of the descending and ascending flues within the furnace walls is determined according to the coke oven design.
[0027] like Figure 3 As shown, the vertical flue 3 is a vertical rectangular pipe, and the air supply tower pipe 2 has a rectangular column structure, located at the center of the vertical flue 3. The inner wall of the vertical flue 3 is provided with spiral ribs, and two adjacent spiral ribs form a spiral air duct. These spiral ribs are formed by a continuous arrangement of spiral fins 31. Similarly, the outer wall of the air supply tower pipe 2 is also provided with spiral ribs, and two adjacent spiral ribs form a spiral air duct. These spiral ribs are formed by a continuous arrangement of spiral fins 21. The spiral air duct formed by the spiral fins 21 on the air supply tower 2 corresponds to the spiral air duct formed by the spiral fins 31 inside the vertical flue 3, thereby guiding the high-temperature flue gas in the vertical flue along a spiral path.
[0028] like Figure 4 As shown, the vertical fire channel 3 is a rectangular tube with both ends open to the outside. The vertical fire channel 3 is constructed of winged refractory bricks 5 and hexagonal refractory bricks. The refractory brick protrusions 51 on the winged refractory bricks 5 are connected to each other in sequence to form a spiral protruding rib-shaped fire channel spiral protrusion 31. The fire channel spiral protrusion 31 is located on the inner wall of the vertical fire channel 3.
[0029] like Figure 5 , Figure 6 As shown, the air supply tower pipe 2 is a square column shape. A blind-hole air supply channel 23 is provided in the middle of the air supply tower pipe 2. The upper end of the air supply channel 23 is closed, and the lower end is open, leading to the air supply source of the air supply tower pipe. Several air supply holes 22 are provided on opposite sides of the air supply tower pipe 2, located between the spiral fins 21 of two adjacent air supply towers.
[0030] The air supply tower pipe 2 is constructed from winged refractory bricks 5, perforated refractory bricks 6 and hexagonal refractory bricks. The refractory brick protrusions 51 on the winged refractory bricks 5 are connected to each other in sequence to form a spiral rib-shaped wind tower spiral protrusion 21. The wind tower spiral protrusion 21 is located on the outer wall surface of the air supply tower pipe 2.
[0031] like Figure 7 , Figure 8 and Figure 9 The winged refractory brick 5 shown has a body that is a regular hexahedron. The winged refractory brick 5 has an outwardly protruding refractory brick wing 51 on its surface. The refractory brick wing 51 is an arc-shaped protrusion.
[0032] like Figure 10 and Figure 11 The perforated refractory brick 6 shown has a body that is a regular hexahedron. An air supply hole 22 with a through-hole structure is provided on the body of the perforated refractory brick 6. The air supply hole 22 connects one brick surface of the perforated refractory brick 6 to the other opposite brick surface.
[0033] The above are some preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make improvements and substitutions to the technical solutions described in the foregoing embodiments. Such substitutions and improvements that violate the spirit and principles of the present utility model shall fall within the protection scope of the present utility model.
Claims
1. A clean coke oven vertical flue capable of uniformly diffused combustion, comprising a carbonization chamber main wall (1), a carbonization chamber (4) located between two adjacent carbonization chamber main walls (1), wherein a vertical flue (3) is provided along the height direction within the carbonization chamber main wall (1), characterized in that: The inner wall of the fire channel (3) is provided with a fire channel spiral wing (31); the chamber of the fire channel (3) is provided with an air supply tower (2), the outer tower surface of the air supply tower (2) is provided with an air tower spiral wing (21), and an air supply hole (22) is provided between two adjacent air tower spiral wing (21); an air supply channel (23) is also provided in the air supply tower (2), and the air supply channel (23) leads to the chamber of the fire channel (3) through the air supply hole (22).
2. The clean coke oven vertical flue capable of uniformly dispersed combustion according to claim 1, characterized in that: The wind tower spiral fin (21) spirally surrounds the tower body of the wind supply tower (2), and the fire channel spiral fin (31) spirally surrounds the inner wall surface of the fire channel (3).
3. The clean coke oven vertical flue capable of uniformly dispersed combustion according to claim 1, characterized in that: The spiral air duct formed by the spiral fins (21) on the upper wind tower of the wind tower (2) corresponds to the spiral air duct formed by the spiral fins (31) on the inner fire channel of the fire channel (3).
4. The clean coke oven vertical flue capable of uniformly dispersed combustion according to claim 3, characterized in that: The spiral lift of the wind tower spiral duct is equal to that of the fire duct spiral duct.
5. The clean coke oven vertical flue capable of uniformly dispersed combustion according to claim 1, characterized in that: The fire channel (3) has a square column tube structure; the air supply tower (2) and the air supply channel (23) both have rectangular cross sections.
6. The clean coke oven vertical flue capable of uniformly dispersed combustion according to claim 1, characterized in that: The air supply channel (23) on the air supply tower (2) is a blind hole, the upper end of the air supply channel (23) is a closed end, and the lower end of the air supply channel (23) leads to the air supply port.
7. The clean coke oven vertical flue capable of uniformly dispersed combustion according to claim 1, characterized in that: The vertical fire channel (3) includes a descending fire channel and an ascending fire channel, which are located alternately within the main wall (1) of the carbonization chamber.