Injection structure of coke oven denitration pipe
By installing a dispersion promoting plate inside the denitrification pipe and optimizing the ammonia injection structure, the problem of insufficient ammonia dispersion was solved, the denitrification efficiency of the coke oven was improved and nitrogen oxide emissions were reduced, achieving a highly efficient denitrification effect.
Patent Information
- Application Number
- CN202520015449.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-06
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2035-01-06
AI Technical Summary
In existing coke oven denitrification technologies, the dispersion of ammonia gas after it is ejected from the nozzle is insufficient, resulting in low denitrification efficiency and easy ammonia escape, which increases investment and operating costs.
A dispersion promoting plate is installed inside the denitrification tube. After ammonia gas is sprayed out from the nozzle, it impacts the dispersion promoting plate. By optimizing the dispersion effect of the airflow, the reaction efficiency of ammonia gas and nitrogen oxides is improved.
It improves the dispersion of ammonia, allowing ammonia to react more fully with nitrogen oxides, thus increasing the denitrification rate and reducing the nitrogen oxide content to below 100 mg/m3, thereby reducing operating costs.
Smart Images
Figure CN223832106U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of refractory materials technology. Specifically, it relates to a coke oven denitrification pipe injection structure. Background Technology
[0002] Coke ovens generate a large amount of combustion waste gas during production, which contains a significant amount of nitrogen oxides (NOx). x Direct emissions of coke oven combustion exhaust gas cause serious environmental pollution. The combustion exhaust gas generated by coking enterprises must undergo denitrification treatment before it can be discharged.
[0003] In existing technologies, combustion exhaust gas denitrification is carried out at the main flue. This denitrification process requires the addition of a denitrification catalyst, and a high-flow-rate, high-temperature fan is needed to overcome the resistance of the catalyst layer. Therefore, this technology involves large investment, high operating costs, and a large footprint. In the new technology, denitrification takes place in a regenerator. A denitrification pipeline is installed in the regenerator, and intermittently arranged nozzles are opened on the pipeline. Ammonia water or ammonia gas flows through the pipeline, and the ammonia gas is injected into the regenerator through the nozzles to react with nitrogen oxides to achieve denitrification. However, after the ammonia gas is injected from the nozzles, the dispersion is insufficient, which greatly reduces the denitrification efficiency and easily causes ammonia escape. Utility Model Content
[0004] Therefore, the technical problem to be solved by this utility model is to provide a coke oven denitrification pipe injection structure that improves the dispersion effect of denitrified ammonia gas after it is sprayed from the nozzle and increases the denitrification rate.
[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a coke oven denitrification pipe injection structure, including a denitrification pipe body, an inner cavity formed within the denitrification pipe body, and a nozzle connected to the fluid in the inner cavity installed on the denitrification pipe body. Ammonia gas is ejected outward through the nozzle within the denitrification pipe body to form a denitrification gas flow stream. A dispersion promoting plate is installed in the direction directly opposite to the injection of the denitrification gas flow stream. On any plane passing through the axis of the denitrification gas flow stream: the surface of the dispersion promoting plate intersects the axis of the denitrification gas flow stream; the gap between the surface of the dispersion promoting plate and the injection end of the nozzle is greater than zero, forming a dispersion gap; ammonia gas is ejected from the nozzle and then sprayed onto the surface of the dispersion promoting plate. By setting the dispersion promoting plate, when the denitrification gas flow stream impacts the dispersion promoting plate, the gas flow stream is dispersed to a certain extent, improving the dispersion effect of ammonia gas, making the reaction between ammonia gas and nitrogen oxides more complete, and increasing the denitrification rate.
[0006] The above-mentioned coke oven denitrification pipe injection structure has an inner diameter of 2-6 mm for the nozzle.
[0007] In the above-mentioned coke oven denitrification pipe injection structure, the width of the dispersion gap is 0.5-5mm.
[0008] In the aforementioned coke oven denitrification pipe injection structure, on a plane perpendicular to the direction of the denitrification airflow, the orthogonal projection area of the dispersion promoting plate on this plane is greater than or equal to the orthogonal projection area of the denitrification airflow on this plane. By setting a dispersion promoting plate with an area larger than the denitrification airflow, the denitrification airflow can disperse to the surroundings after impacting the dispersion promoting plate, thereby improving the dispersion effect.
[0009] In the aforementioned coke oven denitrification pipe injection structure, the angle between the dispersion promoting plate and the axis of the denitrification gas flow is 65-115°. By setting the angle between the dispersion promoting plate and the denitrification gas flow, the dispersion of ammonia gas flow can be promoted.
[0010] In the aforementioned coke oven denitrification pipe injection structure, the denitrification airflow jet is directly facing the center of the dispersion promoting plate, and the axis of the denitrification airflow jet is perpendicular to the dispersion promoting plate. By setting a vertical dispersion promoting plate, the denitrification airflow jet can be evenly dispersed in all directions after impacting the dispersion promoting plate.
[0011] In the above-mentioned coke oven denitrification pipe injection structure, the side wall of the dispersion promoting plate facing the denitrification airflow is a plane, a concave surface, or a convex surface; or the side wall of the dispersion promoting plate facing the denitrification airflow is any combination of two or three of the following: a plane, a concave surface, or a convex surface.
[0012] The above-mentioned coke oven denitrification pipe injection structure has two or more nozzles installed on the denitrification pipe body, and the distance between two adjacent nozzles is 100-300mm.
[0013] The above-mentioned coke oven denitrification tube injection structure has a recessed hole on the denitrification tube body, and the nozzle is installed in the recessed hole, with the injection end of the nozzle flush with the surface of the denitrification tube body.
[0014] In the above-mentioned coke oven denitrification tube injection structure, blind holes are provided on both sides of the nozzle on the denitrification tube body, and the two blind holes are arranged along the axial direction of the denitrification tube body; plate legs are fixedly connected to both sides of the dispersion promoting plate, and the two plate legs are respectively inserted into the two blind holes and fixedly connected to the blind holes.
[0015] The technical solution of this utility model has achieved the following beneficial technical effects:
[0016] By installing a dispersion promoting plate, the dispersion flow field of the denitrification gas stream was optimized, significantly improving the ammonia dispersion effect and reducing the nitrogen oxide content in coke oven exhaust gas to 100 mg / m³. 3 The following measures effectively improved the denitrification rate. Attached Figure Description
[0017] Figure 1 A three-dimensional perspective structural diagram of this utility model;
[0018] Figure 2 A three-dimensional structural diagram of the dispersion promoting plate of this utility model;
[0019] Figure 3 A schematic diagram of the cross-sectional structure of this utility model.
[0020] The reference numerals in the figure are as follows: 1-Denitrification tube body; 2-Inner cavity; 3-Dispersion promoting plate; 4-Blind hole; 5-Sinking platform hole; 6-Nozzle; 7-Leg; 8-Dispersion gap. Detailed Implementation
[0021] This embodiment presents a coke oven denitrification pipe injection structure, such as... Figure 1 , Figure 3 As shown, the device includes a denitrification tube body 1, with an inner cavity 2 formed inside. A nozzle 6, which is in fluid communication with the inner cavity 2, is installed on the denitrification tube body 1. Ammonia gas is ejected outward from the denitrification tube body 1 through the nozzle 6 to form a denitrification gas flow stream. A dispersion promoting plate 3 is installed in the direction directly opposite to the injection of the denitrification gas flow stream. On any plane passing through the axis of the denitrification gas flow stream: the surface of the dispersion promoting plate 3 intersects the axis of the denitrification gas flow stream; the gap between the surface of the dispersion promoting plate 3 and the injection end of the nozzle 6 is greater than zero, and the gap between the surface of the dispersion promoting plate 3 and the injection end of the nozzle 6 forms a dispersion gap 8; ammonia gas is ejected from the nozzle 6 and then sprayed onto the surface of the dispersion promoting plate 3.
[0022] like Figure 1 , Figure 3 As shown, the denitrification tube body 1 has a recessed hole 5, and the nozzle 6 is installed in the recessed hole 5. Fire clay is filled between the recessed hole 5 and the nozzle 6 to improve the fixing effect. The spraying end of the nozzle 6 is flush with the surface of the denitrification tube body 1. There are two or more nozzles 6 installed on the denitrification tube body 1. The distance between two adjacent nozzles 6 is 100-300mm. The inner diameter of the nozzle 6 is 2-6mm, preferably 3mm. The width of the dispersion gap 8 is 0.5-5mm, preferably 1mm.
[0023] like Figure 3 As shown, on a plane perpendicular to the direction of the denitrification airflow: the orthogonal projection area of the dispersion promoting plate 3 on this plane is greater than or equal to the orthogonal projection area of the denitrification airflow on this plane. The dispersion promoting plate 3 adopts a flat plate structure with a length of 70mm, a width of 20mm, and a thickness of 6mm. After the denitrification airflow comes into contact with the dispersion promoting plate 3, it disperses in all directions.
[0024] like Figure 3As shown, the angle between the dispersion promoting plate 3 and the axis of the denitrification airflow is 65-115°. Under different angles, the denitrification airflow is dispersed to different degrees in all directions. In this embodiment, the denitrification airflow is directly facing the center of the dispersion promoting plate 3, and the axis of the denitrification airflow is perpendicular to the dispersion promoting plate 3, so that the denitrification airflow is evenly dispersed in all directions.
[0025] The dispersion promoting plate 3 has a side wall facing the denitrification airflow stream that is flat, concave, or convex; or it can be any combination of two or three of these. In practical applications, the side wall facing the denitrification airflow stream can be designed according to actual needs to achieve different dispersion effects. Concave and convex surfaces refer to the direction relative to the denitrification airflow stream.
[0026] like Figure 1 As shown, blind holes 4 are provided on both sides of the nozzle 6 on the denitrification tube body 1, and the two blind holes 4 are arranged along the axial direction of the denitrification tube body 1; plate legs 7 are fixedly connected to both sides of the dispersion promoting plate 3, and the two plate legs 7 are respectively inserted into the two blind holes 4 and fixedly connected to the blind holes 4. Fire clay is applied between the blind holes 4 and the plate legs 7.
[0027] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of the claims of this patent application.
Claims
1. A coke oven denitrification pipe injection structure, comprising a denitrification pipe body (1), wherein an inner cavity (2) is formed inside the denitrification pipe body (1), and a nozzle (6) fluidly communicating with the inner cavity (2) is installed on the denitrification pipe body (1), wherein ammonia gas is ejected outward from the denitrification pipe body (1) through the nozzle (6) to form a denitrification gas flow stream, characterized in that, A dispersion promoting plate (3) is installed in the direction of the denitrification air jet. On any plane passing through the axis of the denitrification air jet, the surface of the dispersion promoting plate (3) intersects the axis of the denitrification air jet. The gap between the surface of the dispersion promoting plate (3) and the spraying end of the nozzle (6) is greater than zero, and the gap between the surface of the dispersion promoting plate (3) and the spraying end of the nozzle (6) forms a dispersion gap (8); ammonia gas is sprayed from the nozzle (6) and then sprayed onto the surface of the dispersion promoting plate (3).
2. The coke oven denitrification pipe injection structure according to claim 1, characterized in that, The inner diameter of the nozzle (6) is 2-6 mm.
3. The coke oven denitrification pipe injection structure according to claim 1, characterized in that, The width of the dispersion gap (8) is 0.5-5mm.
4. The coke oven denitrification pipe injection structure according to claim 1, characterized in that, On a plane perpendicular to the direction of the denitrification airflow: the orthogonal projection area of the dispersion promoting plate (3) on this plane is greater than or equal to the orthogonal projection area of the denitrification airflow on this plane.
5. The coke oven denitrification pipe injection structure according to claim 1, characterized in that, The angle between the dispersion promoting plate (3) and the axis of the denitrification gas stream is 65-115°.
6. The coke oven denitrification pipe injection structure according to claim 5, characterized in that, The denitrification airflow is directly opposite the center of the dispersion promoting plate (3), and the axis of the denitrification airflow is perpendicular to the dispersion promoting plate (3).
7. A coke oven denitrification pipe injection structure according to any one of claims 1-6, characterized in that, The side wall of the dispersion promoting plate (3) facing the denitrification airflow is a plane, a concave surface, or a convex surface; or the side wall of the dispersion promoting plate (3) facing the denitrification airflow is any combination of two or three of the following: a plane, a concave surface, or a convex surface.
8. The coke oven denitrification pipe injection structure according to claim 1, characterized in that, The denitrification tube body (1) is equipped with two or more nozzles (6), and the distance between two adjacent nozzles (6) is 100-300mm.
9. The coke oven denitrification pipe injection structure according to claim 1, characterized in that, The denitrification tube body (1) is provided with a recessed hole (5), and the nozzle (6) is installed in the recessed hole (5). The spraying end of the nozzle (6) is flush with the surface of the denitrification tube body (1).
10. The coke oven denitrification pipe injection structure according to claim 1, characterized in that, Blind holes (4) are provided on both sides of the nozzle (6) on the denitrification tube body (1), and the two blind holes (4) are arranged along the axial direction of the denitrification tube body (1); plate legs (7) are fixedly connected to both sides of the dispersion promoting plate (3), and the two plate legs (7) are respectively inserted into the two blind holes (4) and fixedly connected to the blind holes (4).