Clean heat recovery coke oven double-layer horizontal fireway structure
By adopting a double-layer horizontal flue structure in the heat recovery coke oven, the problems of uneven temperature and nitrogen oxide pollution have been solved, resulting in improved heating efficiency and reduced footprint, thus improving coke quality and production efficiency.
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
- 2025-06-09
- Publication Date
- 2026-07-03
AI Technical Summary
The existing lower flue structure of heat recovery coke ovens suffers from problems such as uneven temperature, low heating efficiency, large footprint, and serious nitrogen oxide pollution.
It adopts a double-layer horizontal fire channel structure, with descending fire channels and ascending fire channels alternately set. The fire channel partition is used to separate the upper and lower horizontal fire channel cavities. An air supply pipe is installed in the lower fire channel cavity to adjust the air supply volume and improve temperature controllability and uniformity.
It achieves a uniform temperature field distribution at the furnace bottom, improves heating efficiency, reduces nitrogen oxide generation, reduces floor space, and enhances coke maturation quality and production efficiency.
Smart Images
Figure CN224450583U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a clean heat recovery coke oven, and more particularly to an improvement in the lower flue structure of the heat recovery coke oven. Background Technology
[0002] The clean heat recovery coke oven mainly consists of a roof, main walls of the carbonization chamber, the carbonization chamber itself, descending and ascending flues, and a multi-unit bottom flue. The heating and coking process in the clean heat recovery coke oven involves two methods: direct heating and indirect heating. In the carbonization chamber, the coal undergoes pyrolysis to produce combustible raw coal gas. Part of this raw coal gas mixes with air entering from the top of the carbonization chamber and combusts, directly heating the coal. The remaining unburned raw coal gas flows sequentially through the descending and ascending flues, then into the multi-unit bottom flue below the carbonization chamber. In this flue, the combustible gas mixes with air and combusts completely, with heat indirectly transferred to the coal via the bottom of the carbonization chamber. The exhaust gas from the combustion process finally exits the heat recovery coke oven body and enters the flue gas output pipe through the ascending pipe at the top.
[0003] Most multi-unit bottom flues in the lower part of heat recovery coke ovens adopt an S-shaped multi-return series horizontal flue structure. This series-return horizontal flue has a long flue gas flow path, high system resistance, and uneven temperature distribution at the bottom of the furnace. On the one hand, the series-return horizontal flues only have secondary air inlets in some of the lower horizontal flues, making it impossible to regulate the amount of secondary air in each section of the lower horizontal flue. This results in poor temperature controllability in the lower flues of the heat recovery coke oven, uneven temperature at the bottom of the carbonization chamber, and ultimately uneven heating of the coal cake, leading to a longer coking time and reduced production efficiency. On the other hand, due to the uneven air distribution in the multi-return flues, localized intense combustion can easily form high-temperature zones. Under high-temperature conditions, nitrogen in the combustion air reacts with oxidants to generate thermal nitrogen oxides, which are a major source of air pollution.
[0004] Currently, most heat recovery coke ovens employ wide carbonization chambers for coking, resulting in larger coke pieces. However, excessively wide carbonization chambers severely impact heat transfer, leading to prolonged coking time, large footprint, and high investment costs. While narrowing the carbonization chamber reduces the footprint, it also narrows the overall width of the multi-connected bottom flues at the bottom of the chamber, affecting the uniformity of heating at the bottom. The descending flues are rich in combustible raw gas and have a higher temperature, while the ascending flues contain higher levels of post-combustion flue gas and have a relatively lower temperature. The horizontal flues at the bottom of the carbonization chamber include both those leading to the descending and ascending flues. In this structure, the lower-temperature horizontal flues leading to the ascending flues actually encroach on the space of the higher-temperature descending flues, shortening the descending flues and resulting in insufficient heat gain at the bottom of the chamber. Furthermore, the inconsistency in combustion temperatures between the two types of flues also leads to lower and uneven heating in the carbonization chamber, affecting coking quality and heating efficiency. Utility Model Content
[0005] 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 heat recovery coke oven double-layer horizontal fire channel structure with uniform temperature field distribution at the furnace bottom and high heating efficiency.
[0006] To solve the above-mentioned technical problems, the present invention provides a clean heat recovery coke oven double-layer horizontal fire channel structure, including a carbonization chamber main wall, a carbonization chamber located between two adjacent carbonization chamber main walls, and a descending fire channel and an ascending fire channel arranged in the carbonization chamber main wall, wherein the descending fire channel and the ascending fire channel are arranged alternately and at intervals in the carbonization chamber main wall.
[0007] The bottom of the carbonization chamber is divided into an upper horizontal fire passage cavity and a lower horizontal fire passage cavity by a fire passage partition. The fire passage partition is provided with a partition through hole.
[0008] The upper horizontal fire channel cavity is provided with an upper fire channel intermediate partition wall. A first upper fire channel partition wall and a second upper fire channel partition wall are provided at intervals between the upper fire channel intermediate partition wall and the main wall of the carbonization chamber. A first upper horizontal fire channel is formed between the main wall of the carbonization chamber and the first upper fire channel partition wall. A second upper horizontal fire channel is formed between the first upper horizontal fire channel partition wall and the second upper horizontal fire channel partition wall. An upper sunken fire channel is formed between the second upper horizontal fire channel partition wall and the upper fire channel intermediate partition wall.
[0009] The lower horizontal fire channel cavity is provided with a lower fire channel partition wall, which forms a lower horizontal fire channel between the lower fire channel partition wall and the main wall of the carbonization chamber; a lower make-up air pipe is provided in the lower horizontal fire channel.
[0010] Preferably, a plurality of descending fire channels and ascending fire channels are vertically arranged inside the main wall of the carbonization chamber, and the descending fire channels and ascending fire channels are arranged adjacent to each other.
[0011] Preferably, the upper space of the carbonization chamber leads to the first upper horizontal fire channel via a descending fire channel inlet, a descending fire channel, and a descending fire channel outlet. The first upper horizontal fire channel leads to the upper lower fire channel via a tortuous second upper horizontal fire channel. The upper lower fire channel leads to the upper fire channel via a partition through-hole, a lower horizontal fire channel, and an upper fire channel inlet.
[0012] Preferably, the upper horizontal fire channel cavity is further provided with an upper fire channel rib wall in the width direction. The upper fire channel intermediate partition wall and the upper fire channel rib wall, which are perpendicular to each other, divide the upper horizontal fire channel cavity into four upper cavity areas. Each upper cavity area is provided with a tortuous and interconnected first upper horizontal fire channel, second upper horizontal fire channel and upper sunken fire channel.
[0013] Preferably, the lower horizontal fire channel cavity is further provided with a lower fire channel rib wall in the width direction. The mutually perpendicular lower fire channel rib wall and lower fire channel partition wall divide the lower horizontal fire channel cavity into four lower cavity areas, and a lower air supply pipe is provided in each lower cavity area.
[0014] Preferably, the top wall of the air supply pipe is an arc-shaped top wall, and air supply ports facing different directions are provided on the arc-shaped top wall.
[0015] Preferably, the outward port of the air supply duct is provided with an air supply duct control valve.
[0016] Preferably, the through hole in the partition is located at the bottom of the upper-level sinking fire channel.
[0017] Preferably, an arc-shaped furnace top is provided between the tops of the main walls of two adjacent carbonization chambers, and a furnace top air distributor is provided on the furnace top, which leads to the carbonization chamber.
[0018] In the above structure, since the descending fire channel and the ascending fire channel are arranged alternately, it is beneficial to reduce the uneven heating of the carbonization chamber caused by the uneven heating temperature of the descending fire channel and the ascending fire channel, so as to ensure uniform heating of the carbonization chamber and coking quality. Furthermore, the presence of an upper-level fire channel partition wall in the upper fire channel cavity creates a symmetrical upper-level horizontal fire channel structure, significantly shortening the length of the upper-level horizontal fire channel and reducing the resistance of the fire channel system. This not only facilitates the uniform distribution of the temperature field at the furnace bottom and reduces the heating temperature difference within the fire channel, but also prevents the occurrence of localized intense combustion within the fire channel due to the shorter horizontal fire channel, reducing the probability of nitrogen oxide formation in the flue gas and minimizing environmental pollution during coke oven emissions. In the lower-level horizontal fire channel cavity, the lower fire channel partition wall divides the space into multiple lower chamber areas, and each lower chamber area is equipped with a lower-level air supply pipe. This not only increases the uniformity of air supply, facilitating the thorough mixing and combustion of combustible gas and air, but also allows for easier adjustment of the air supply amount through the air supply pipe control valve or regulating brick, improving the temperature controllability and uniformity of the bottom fire channel in the heat recovery coke oven. Furthermore, the double-layer horizontal flue structure at the bottom of the carbonization chamber, with the upper horizontal flue connected to the descending flue rich in raw coal gas, generates a higher heating temperature in the carbonization chamber. The lower horizontal flue, after being supplemented with combustion air, enters the ascending flue. This double-layer structure effectively lengthens the combustion path, balances and reduces the intensity of combustion in the bottom flue, which is beneficial for coke maturation and improving coking quality, as well as suppressing the formation of nitrogen oxides. The double-layer horizontal flue structure also effectively reduces the width of the carbonization chamber, thereby reducing the width of the carbonization chamber and the footprint of the coke oven without affecting the coke production rate. Attached Figure Description
[0019] The following description, in conjunction with the accompanying drawings and specific embodiments, further illustrates the double-layer horizontal flue structure of the clean heat recovery coke oven of this utility model.
[0020] Figure 1 This is a schematic diagram of a specific embodiment of the clean heat recovery coke oven double-layer horizontal flue structure of this utility model;
[0021] Figure 2 yes Figure 1 Schematic diagram of the structure along section A-A;
[0022] Figure 3 yes Figure 1 Schematic diagram of the structure of section B-B;
[0023] Figure 4 yes Figure 1 Schematic diagram of the structure of the central flue partition;
[0024] Figure 5 yes Figure 4 C-C section view;
[0025] Figure 6 yes Figure 1 Schematic diagram of the middle and lower layer make-up air duct;
[0026] Figure 7 yes Figure 6 D-D cross-sectional view.
[0027] In the diagram, 1—main wall of the carbonization chamber, 2—ascending flue, 3—ascending flue outlet, 4—carbonization chamber, 5—furnace top, 6—furnace top air distributor, 7—descending flue inlet, 8—descending flue, 9—descending flue outlet, 10—first upper-level horizontal flue, 11—second upper-level horizontal flue, 12—upper-level sunken flue, 13—partition hole, 14—flue partition, 15—ascending flue inlet, 16—lower-level make-up air pipe, 17—lower-level flue partition wall, 18—lower-level horizontal flue, 19—upper-level flue rib wall, 20—first upper-level flue partition wall, 21—second upper-level flue partition wall, 22—upper-level flue rib wall, 23—lower-level flue rib wall, 24—make-up air inlet, 25—make-up air pipe control valve. Detailed Implementation
[0028] like Figure 1The clean-type heat recovery coke oven with a double-layer horizontal flue structure shown includes two vertically parallel carbonization chamber main walls 1. A carbonization chamber 4 is located between the two carbonization chamber main walls 1. An arched furnace roof 5 is provided at the top of the two adjacent carbonization chamber main walls 1. A furnace roof air distributor 6 for supplying air to the carbonization chamber 4 is installed on the furnace roof 5. The furnace roof air distributor 6 adopts a common air distributor structure in heat recovery coke ovens. A descending flue 8 and an ascending flue 2 are alternately arranged on each carbonization chamber main wall 1, i.e., one of two adjacent flues is a descending flue 8, and the other is an ascending flue 2. The descending flue 8 and the ascending flue 2 are located adjacent to each other within the carbonization chamber main wall 1. The end of the descending flue 8 is located above the flue partition 4, and the beginning of the ascending flue 2 is located below the flue partition 14.
[0029] The bottom of the carbonization chamber 4 is divided into an upper horizontal flue chamber and a lower horizontal flue chamber by a flue partition 14, and a partition through hole 13 is provided on the flue partition 14. The upper horizontal flue chamber is connected to the lower horizontal flue chamber through the partition through hole 13. The upper space of the carbonization chamber 4 is connected to the first upper horizontal flue 10 of the upper horizontal flue chamber through the descending flue inlet 7, descending flue 8, and descending flue outlet 9 in sequence; the lower horizontal flue chamber is connected to the ascending flue outlet 3 through the lower horizontal flue 18, ascending flue inlet 15, and ascending flue 2 in sequence, and the ascending flue outlet 3 enters the high-temperature flue gas pipeline through the ascending pipe to the boiler used for power generation.
[0030] like Figure 2 As shown, descending fire channels 8 and ascending fire channels 2 are alternately arranged on the main wall 1 of the carbonization chamber. In the space enclosed by two adjacent main walls 1 of the carbonization chamber, as well as the coke oven walls and machine oven walls at both ends of the main walls 1 of the carbonization chamber, an upper fire channel partition wall 22 is arranged along the length, and an upper fire channel rib wall 19 is arranged along the width. The mutually perpendicular upper fire channel rib walls 19 and upper fire channel partition walls 22 divide the upper horizontal fire channel cavity into four upper cavity regions. In each upper cavity region, a first upper fire channel partition wall 20 and a second upper fire channel partition wall 21 are also arranged at intervals. The first upper fire channel partition wall 20 forms a first upper horizontal fire channel 10 with the main wall 1 of the carbonization chamber, and a reversing passage is left between the first upper fire channel partition wall 20 and the upper fire channel rib wall 19. A reversing passage is also left between the second upper fire channel partition wall 21 and the coke oven end wall (coke oven side end wall or machine oven side end wall). A second upper-level horizontal fire channel 11 is formed between the first upper-level fire channel partition wall 20 and the second upper-level fire channel partition wall 21, and an upper-level sunken fire channel 12 is formed between the second upper-level fire channel partition wall 21 and the upper-level fire channel intermediate partition wall 22. The partition through hole 13 on the fire channel partition 14 is located at the bottom of the upper-level sunken fire channel 12.
[0031] like Figure 3As shown, the rising flue 2 on the main wall 1 of the carbonization chamber extends to this cross-section, so only the rising flue 2 exists on the main wall 1 of the carbonization chamber at this cross-section. In this cross-section, in the space enclosed by two adjacent main walls 1 of the carbonization chamber and the coke side furnace wall and the machine side furnace wall at both ends of the main wall 1 of the carbonization chamber, a lower flue partition wall 17 is arranged along the length and a lower flue rib wall 23 is arranged along the width. The mutually perpendicular lower flue partition wall 17 and lower flue rib wall 23 divide the lower horizontal flue cavity into four lower cavity areas. A lower air supply pipe 16 is arranged in each lower cavity area. An air supply pipe regulating valve 25 is arranged at the outward port of the lower air supply pipe 16 to regulate and control the air supply of the lower air supply pipe 16. The air supply pipe regulating valve 25 can be an outward opening door in the coke oven, a sliding door, or can be adjusted by stacking bricks.
[0032] like Figure 4 , Figure 5 The fire channel partition 14 shown is a rectangular plate made of refractory cement. Two rows of partition through holes 13 are provided on the fire channel partition 14, and each row of partition through holes 13 corresponds to an upper-level sunken fire channel 12.
[0033] like Figure 6 , Figure 7 As shown, the lower-level make-up air duct 16 is an arched blind path made of refractory cement, with its inner end closed and its outer end being a make-up air duct control valve 25. Several make-up air inlets 24 are provided on the arched top wall of the lower-level make-up air duct 16, and three make-up air inlets 24 facing different directions are provided on the same pipe cross section, so as to supply combustion air to the lower-level horizontal fire channel 18.
[0034] During coking, the raw coal gas produced by pyrolysis in the upper space of the coking chamber 4 is mixed with the combustion air supplied through the furnace top air distributor 6 and then burned to form high-temperature flue gas. The high-temperature flue gas and the unburned raw coal gas in it descend sequentially through the lower flue inlet 7, the lower flue 8, and the lower flue outlet 9 into the first upper horizontal flue 10 of the upper horizontal flue chamber. The high-temperature flue gas and raw coal gas then meander through the first upper horizontal flue 10 and the second upper horizontal flue 11 into the upper lower flue 12. The high-temperature flue gas and raw coal gas in the upper lower flue 12 pass through the partition through hole 13 into the lower horizontal flue 18 and are mixed with the combustion air supplied by the lower air supply pipe 16 again. After being burned again, they enter the rising flue inlet 15 and the rising flue 2 into the rising flue outlet 3, and then are transported to the waste heat boiler for power generation through the rising pipe and the high-temperature flue gas conveying pipe.
[0035] 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 heat recovery coke oven double-layer horizontal flue structure, comprising a carbonization chamber main wall (1), a carbonization chamber (4) located between two adjacent carbonization chamber main walls (1), and a descending flue (8) and an ascending flue (2) disposed within the carbonization chamber main wall (1), characterized in that: The descending fire channel (8) and the ascending fire channel (2) are alternately arranged in the main wall (1) of the carbonization chamber; The bottom of the carbonization chamber (4) is divided into an upper horizontal fire channel cavity and a lower horizontal fire channel cavity by a fire channel partition (14), and the fire channel partition (14) is provided with a partition through hole (13). The upper horizontal fire channel cavity is provided with an upper fire channel middle partition wall (22). A first upper fire channel partition wall (20) and a second upper fire channel partition wall (21) are provided at intervals between the upper fire channel middle partition wall (22) and the main wall (1) of the carbonization chamber. A first upper horizontal fire channel (10) is formed between the main wall (1) of the carbonization chamber and the first upper fire channel partition wall (20). A second upper horizontal fire channel (11) is formed between the first upper fire channel partition wall (20) and the second upper horizontal fire channel partition wall (21). An upper sunken fire channel (12) is formed between the second upper fire channel partition wall (21) and the upper fire channel middle partition wall (22). The lower horizontal fire channel cavity is provided with a lower fire channel partition wall (17), and a lower horizontal fire channel (18) is formed between the lower fire channel partition wall (17) and the main wall (1) of the carbonization chamber; a lower make-up air pipe (16) is provided in the lower horizontal fire channel (18).
2. The cleaning type heat recovery coke oven double layer horizontal fireway structure according to claim 1, characterized in that: Several descending fire channels (8) and ascending fire channels (2) are vertically arranged inside the main wall (1) of the carbonization chamber, and the descending fire channels (8) and ascending fire channels (2) are arranged adjacent to each other.
3. The cleaning type heat recovery coke oven dual layer horizontal fireway structure according to claim 1, characterized in that: The upper space of the carbonization chamber (4) passes through the descending fire channel inlet (7), descending fire channel (8), and descending fire channel outlet (9) to the first upper horizontal fire channel (10). The first upper horizontal fire channel (10) passes through the second upper horizontal fire channel (11) to the upper sunken fire channel (12). The upper sunken fire channel (12) passes through the partition through hole (13), lower horizontal fire channel (18), and rising fire channel inlet (15) to the rising fire channel (2).
4. The clean type heat recovery coke oven dual layer horizontal fireway structure according to claim 1, 2 or 3, characterized in that: The upper horizontal fire channel cavity is also provided with an upper fire channel rib wall (19) in the width direction. The upper fire channel middle partition wall (22) and the upper fire channel rib wall (19) are perpendicular to each other and divide the upper horizontal fire channel cavity into four upper cavity areas. Each upper cavity area is provided with a tortuous and connected first upper horizontal fire channel (10), second upper horizontal fire channel (11) and upper sunken fire channel (12).
5. The clean type heat recovery coke oven dual layer horizontal fireway structure according to claim 1, 2 or 3, characterized in that: The lower horizontal fire channel cavity is also provided with a lower fire channel rib wall (23) in the width direction. The lower fire channel rib wall (23) and the lower fire channel partition wall (17) that are perpendicular to each other divide the lower horizontal fire channel cavity into four lower cavity areas. Each lower cavity area is provided with a lower air supply pipe (16).
6. The cleaning type heat recovery coke oven dual layer horizontal fireway structure according to claim 5, characterized in that: The top wall of the air supply pipe (16) is an arc-shaped top wall, and air supply ports (24) facing different directions are provided on the arc-shaped top wall.
7. The cleaning type heat recovery coke oven dual layer horizontal fireway structure according to claim 6, characterized in that: The outward port of the make-up air pipe (16) is provided with a make-up air pipe control valve (25).
8. The clean heat recovery coke oven double-layer horizontal flue structure according to claim 1, characterized in that: The through hole (13) of the partition is located at the bottom of the upper sinking fire channel (12).
9. The clean heat recovery coke oven double-layer horizontal flue structure according to claim 1, characterized in that: An arc-shaped furnace top (5) is provided between the tops of the main walls (1) of two adjacent carbonization chambers. A furnace top air distributor (6) is provided on the furnace top (5), and the air distributor (6) leads to the carbonization chamber (4).