Clean type ascending and descending flame path of heat recovery coke oven

Abstract

The utility model discloses a clean type heat recovery coke oven ascending and descending flame path which comprises carbonization chamber main walls, a carbonization chamber is positioned between two adjacent carbonization chamber main walls, and a descending flame path, an ascending flame path and an air supply pipe are vertically arranged in the carbonization chamber main walls; the descending flame path and the ascending flame path are located on the two sides of the air supply pipe respectively, and air supply holes formed in the pipe walls of the two sides of the air supply pipe lead to the descending flame path or the ascending flame path on the corresponding side respectively. Flame path guide plates are obliquely mounted on two opposite side walls of the descending flame path and the ascending flame path. And the flame path guide plates are obliquely arranged on the inner side walls of the descending flame path and the ascending flame path in a staggered manner. And the front end of the flame path guide plate extends out of the center line of the descending flame path or the ascending flame path. And the air supply pipe is built by air hole bricks. The device has the characteristics of uniform heating, excellent coking quality and capability of effectively inhibiting the generation of nitrogen oxides.

Description

Technical Field

[0001] This utility model relates to a clean heat recovery coke oven, and more particularly to the rising and falling fire channels in the carbonization chamber fire channels of a clean heat recovery coke oven. Background Technology

[0002] Clean heat recovery coke ovens are production facilities that achieve coke-power cogeneration by recovering and transporting hot gas under negative pressure to waste heat boilers during coking production. During the coking process, the raw coal gas containing harmful and toxic gases is completely burned off at high temperatures, which not only greatly reduces the environmental pollution hazards of the coking process, but also makes full and comprehensive use of waste heat resources.

[0003] Clean heat recovery coke ovens mainly consist of a carbonization chamber, an ascending flue, a descending flue, a flue, and an air inlet. 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 a narrower 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 ascending and descending flues in the main wall. The increased height of the ascending and descending flues directly affects the thermal efficiency of the carbonization chamber walls and easily leads to uneven combustion of combustible raw gas and combustion air in the ascending and descending flues. This results in differences in the combustion of raw gas in the ascending and descending flues, causing uneven heating of the coke oven and consequently affecting heating efficiency and coke quality. Narrowing the carbonization chamber and increasing the height and length of the flue will exacerbate the generation of nitrogen oxides. Due to the increased height and length of the vertical flue, localized intense combustion will form within the flue, 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. The large-scale emission of nitrogen oxides will undermine the environmentally friendly characteristics of clean heat recovery coke ovens. The existence of localized high-temperature zones in the vertical flue becomes a major source of pollutants from coke ovens. Summary of the Invention

[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 heat recovery coke oven rising and falling fire channel that can uniformly heat and effectively suppress the generation of nitrogen oxides.

[0005] To solve the above-mentioned technical problems, the present invention provides a clean heat recovery coke oven rising and falling fire channels, including a carbonization chamber main wall, the carbonization chamber being located between two adjacent carbonization chamber main walls, and a falling fire channel, a rising fire channel, and an air supply pipe vertically arranged inside the carbonization chamber main wall; the falling fire channel and the rising fire channel are respectively located on both sides of the air supply pipe, and the air supply holes provided on the pipe walls on both sides of the air supply pipe lead to the falling fire channel or the rising fire channel on the corresponding side; fire channel guide plates are installed obliquely on the opposite side walls of the falling fire channel and the rising fire channel.

[0006] Preferably, fire guide plates are installed downwardly and alternately on the inner wall of the descending fire channel.

[0007] Preferably, fire guide plates are installed on the inner wall of the rising fire channel in an upwardly inclined and staggered manner.

[0008] Preferably, the front ends of the guide plates on the opposite side walls of the descending fire channel and the ascending fire channel extend beyond the centerline of the descending fire channel or the ascending fire channel.

[0009] Preferably, the air supply pipe is constructed by stacking perforated bricks, with a stacking groove on the upper stacking surface of the perforated bricks and a stacking tenon on the lower stacking surface of the perforated bricks, the stacking groove and the stacking tenon fitting together.

[0010] Preferably, the building groove is a groove with an inclined groove edge, and the building tenon is a tenon with an inclined tenon edge.

[0011] In the above structure, since the main wall of the carbonization chamber is vertically equipped with descending and ascending fire channels, and the descending and ascending fire channels are located on both sides of the air supply pipe, combustion air is uniformly supplied to the descending and ascending fire channels along the height direction through the air supply holes on the side wall of the air supply pipe. This allows the combustion air to be fully mixed with the combustible raw coal gas in the descending and ascending fire channels, forming a balanced degree of combustion. This avoids the formation of nitrogen oxides in the violent combustion zones in the ascending and descending fire channels, effectively suppressing the high temperature formed by violent combustion, thereby avoiding the formation of thermal nitrogen oxides. The balanced degree of combustion in the ascending and descending fire channels also makes the coke oven heated evenly, improving the heating efficiency and forming quality of the coke oven. Furthermore, because the descending and ascending flues are equipped with inclined baffles on their respective side walls, the staggered and inclined baffles create a tortuous airflow channel. This not only ensures thorough mixing of the blast furnace gas and combustion air, improving combustion efficiency and heating uniformity, which is beneficial for coke quality, but also significantly increases heat transfer efficiency due to the tortuous flow of the high-temperature airflow, allowing for full utilization of the high-temperature flue gas's thermal energy. This structure allows for a reduction in the width and an increase in the height of the carbonization chamber, thereby reducing the footprint of the coke oven and lowering the construction and investment costs of the heat recovery coke oven. Attached Figure Description

[0012] The following detailed description of the clean heat recovery coke oven rising and falling fire channels of this utility model, in conjunction with the accompanying drawings and specific embodiments, provides further details.

[0013] Figure 1 This is a schematic diagram of a specific embodiment of the rising and falling fire channels of the clean heat recovery coke oven of this utility model;

[0014] Figure 2 yes Figure 1 Schematic diagram of the A-A section of the middle descending fire channel;

[0015] Figure 3 yes Figure 1 Schematic diagram of the structure of the B-B section of the central ascent flue;

[0016] Figure 4 yes Figure 1 A schematic diagram of the C-C cross-section of the central air supply duct;

[0017] Figure 5 yes Figure 4 Cross-sectional structural diagram of the stroke-hole brick;

[0018] Figure 6 yes Figure 5 Top view;

[0019] Figure 7 yes Figure 5 There is a left view.

[0020] In the diagram, 1—main wall of the carbonization chamber, 2—descending fire channel, 3—ascending fire channel, 4—fire channel guide plate, 5—air supply pipe, 6—air supply hole, 7—carbonization chamber, 8—air hole brick, 9—ventilation channel. Detailed Implementation

[0021] like Figure 1 , Figure 2 and Figure 3 The clean heat recovery coke oven shown includes vertically spaced carbonization chamber main walls 1, forming a carbonization chamber 7 between two spaced-apart carbonization chamber main walls 1. Several flue pipes are vertically arranged within the carbonization chamber main walls 1. The cavity of each flue pipe is divided into a descending flue 2 and an ascending flue 3 by an air supply pipe 5. The descending flue 2 and ascending flue 3 are located on opposite sides of the air supply pipe 5. Three air supply holes 6 are provided on the sidewall of the air supply pipe 5 corresponding to the descending flue 2 and ascending flue 3. The cavity of the air supply pipe 5 connects to the descending flue 2 and ascending flue 3 on the corresponding side through the corresponding air supply holes 6.

[0022] Fire channel guide plates 4 are fixedly installed downwardly and alternately on the opposite side walls of the descending fire channel 2. The fire channel guide plates 4 are made of refractory cement. The longitudinal direction of the fire channel guide plate 4 is consistent with the center line of the air supply hole 6, that is, the two ends of the fire channel guide plate 4 are fixedly connected to the outer pipe wall of the air supply pipe 5 and the inner pipe wall of the descending fire channel 2, respectively; one side of the fire channel guide plate 4 is also fixedly installed on one side inner wall of the descending fire channel 2, and the other side of the fire channel guide plate 4 is an outwardly extended end.

[0023] Similarly, fire guide plates 4 are fixedly installed upwardly and alternately on the opposite side walls of the rising fire channel 3. The fire guide plates 4 are made of refractory cement. The longitudinal direction of the fire guide plate 4 is consistent with the center line of the air supply hole 6. That is, the two ends of the fire guide plate 4 are fixedly connected to the outer pipe wall of the air supply pipe 5 and the inner pipe wall of the rising fire channel 3, respectively. One side of the fire guide plate 4 is also fixedly installed on one side of the inner wall of the rising fire channel 3, and the other side of the fire guide plate 4 is the outward extension end.

[0024] The fire channel guide plates 4 on the inner wall of the descending fire channel 2 are inclined downwards and are staggered and fixedly installed on the corresponding fire channel sidewalls. For example... Figure 2 As shown, in the descending fire channel 2, from top to bottom, there are fire channel guide plates 4 extending downwards on the left, 4 extending downwards on the right, 4 extending downwards on the left, 4 extending downwards on the right, and so on. They are installed downwards in an alternating manner, and the extended front ends of the fire channel guide plates 4 fixed on the left and right sides all extend beyond the center line of the descending fire channel 2, thus forming a fire channel that flows downwards in a tortuous manner.

[0025] The fire guide plates 4 on the inner wall of the ascending fire channel 3 are inclined upwards and staggeredly fixed to the corresponding fire channel sidewalls. For example... Figure 3 As shown, in the same rising fire channel 3, from top to bottom, there are fire channel guide plates 4 extending upwards on the left, fire channel guide plates 4 extending upwards on the right, fire channel guide plates 4 extending upwards on the left, fire channel guide plates 4 extending upwards on the right, and so on. They are installed in an alternating upward tilt, and the extended front ends of the fire channel guide plates 4 fixed on the left and right sides all extend beyond the center line of the rising fire channel 3, thus forming a fire channel that flows upwards in a tortuous manner.

[0026] like Figure 4 As shown, the air supply pipe 5 is constructed by stacking air hole bricks 8 from bottom to top, and the ventilation channels 9 on each air hole brick 8 are stacked to form the air supply pipe 5.

[0027] like Figure 5 , Figure 6 and Figure 7As shown, the body of the perforated brick 8 is a hexahedron, with a ventilation channel 9 provided in the middle of the body. The upper stacking surface of the perforated brick 8 is a stacking groove for stacking, and the groove side is an inclined edge. The lower stacking surface of the perforated brick 8 is a stacking tenon for stacking, and the tenon side has an inclined edge. The structural shapes of the stacking groove and the stacking tenon of the perforated brick 8 match so that two adjacent perforated bricks 8 can be stacked together to form an air supply pipe 5.

[0028] The two air supply holes 6 on the opposite sides of the ventilation brick 8 are aligned on the same straight line, and these two air supply holes 6 extend from the ventilation channel 9 to both sides of the outer brick wall. The air supply holes 6 and the ventilation channel 9 are perpendicular to each other. Of course, the air supply holes 6 and the ventilation channel 9 can also be set at an angle to each other.

[0029] 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 rising and falling flue, comprising a carbonization chamber main wall (1), wherein a carbonization chamber (7) is located between two adjacent carbonization chamber main walls (1), characterized in that: The main wall (1) of the carbonization chamber is vertically provided with a descending fire channel (2), an ascending fire channel (3) and an air supply pipe (5); the descending fire channel (2) and the ascending fire channel (3) are located on both sides of the air supply pipe (5), and the air supply holes (6) set on the pipe walls on both sides of the air supply pipe (5) lead to the descending fire channel (2) or the ascending fire channel (3) on the corresponding side; the fire channel guide plates (4) are installed obliquely on the opposite side walls of the descending fire channel (2) and the ascending fire channel (3).

2. The clean heat recovery coke oven rising and falling flue as described in claim 1, characterized in that: Fire guide plates (4) are installed downwardly and alternately on the inner wall of the descending fire channel (2).

3. The clean heat recovery coke oven rising and falling flue as described in claim 1, characterized in that: Fire guide plates (4) are installed on the inner wall of the rising fire channel (3) at an upward angle and in an alternating manner.

4. The clean-type heat recovery coke oven rising and falling flues according to claim 1, 2 or 3, characterized in that: The front ends of the fire guide plates (4) on the opposite side walls of the descending fire channel (2) and the ascending fire channel (3) extend beyond the center line of the descending fire channel (2) or the ascending fire channel (3).

5. The clean heat recovery coke oven rising and falling flue according to claim 1, 2 or 3, characterized in that: The air supply pipe (5) is constructed from air-hole bricks (8). The upper surface of the air-hole bricks (8) is provided with a building groove, and the lower surface of the air-hole bricks (8) is provided with a building tenon. The building groove and the building tenon match each other.

6. The clean heat recovery coke oven rising and falling flue as described in claim 5, characterized in that: The stacking groove is a groove with an inclined groove edge, and the stacking tenon is a tenon with an inclined tenon edge.

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