Device for preventing ammonia escape in flue gas denitrification

Abstract

The utility model relates to the technical field of flue gas denitration towers, and discloses an ammonia escape prevention device for flue gas denitration, which comprises a denitration reaction tower, an ammonia gas injection assembly, a mixing device, a catalyst layer, an ammonia escape monitor and ammonia gas recovery equipment, and is characterized in that the ammonia gas injection assembly is arranged at the bottom of the denitration reaction tower and is used for injecting ammonia gas into the denitration reaction tower; and the mixing device is positioned above the ammonia gas spraying assembly, so that ammonia gas can be fully mixed with flue gas entering the denitration reaction tower. According to the utility model, ammonia gas is accurately injected through the ammonia gas injection assembly, the mixing device promotes full mixing of ammonia gas and flue gas, good conditions are provided for reaction, the catalyst layer accelerates denitration reaction and improves denitration efficiency, the ammonia escape monitor monitors the ammonia escape condition at an outlet in real time, the ammonia gas recovery equipment timely recovers unreacted ammonia gas, and ammonia gas emission is reduced; therefore, flue gas denitration is effectively realized, ammonia escape is prevented, and pollution to the environment is reduced.

Description

Technical Field

[0001] This utility model relates to the field of flue gas denitrification tower technology, and in particular to a flue gas denitrification device to prevent ammonia escape. Background Technology

[0002] A flue gas denitrification tower is a device used to remove nitrogen oxides (NOx) from flue gas. Through catalytic reduction or non-catalytic reduction reactions, it converts NOx in the flue gas into nitrogen and water vapor, thereby reducing the pollutant content in the flue gas and minimizing environmental pollution. It is widely used in coal-fired power plants, industrial boilers, and other fields to help control NOx emissions and meet environmental standards.

[0003] Traditional flue gas denitrification towers typically consist of multiple functional units, including an airflow distribution system, a reaction zone, and an absorption zone. Within these zones, the flue gas reacts with a reducing agent (such as ammonia or urea) to remove nitrogen oxides. This structural design helps improve reaction efficiency and pollutant removal effectiveness.

[0004] Traditional flue gas denitrification towers are prone to ammonia escape, primarily due to insufficient contact time between ammonia and flue gas in the reaction zone or low reaction efficiency, resulting in incomplete ammonia participation in the reduction reaction. Simultaneously, uneven airflow distribution or inadequate distribution of the reducing agent causes excess ammonia in certain areas to fail to react effectively with nitrogen oxides, thus escaping into the flue gas. This ammonia escape not only affects denitrification efficiency but also causes ammonia pollution in the air, leading to secondary pollution problems such as acid rain. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a flue gas denitrification device to prevent ammonia escape, aiming to improve the problem of ammonia escape that easily occurs in traditional flue gas denitrification towers, which can lead to secondary pollution problems such as acid rain and other environmental issues.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a flue gas denitrification device for preventing ammonia escape, comprising a denitrification reaction tower, an ammonia injection assembly, a mixing device, a catalyst layer, an ammonia escape monitor, and an ammonia recovery device. The ammonia injection assembly is located at the bottom of the denitrification reaction tower and is used to inject ammonia into the denitrification reaction tower. The mixing device is located above the ammonia injection assembly and can fully mix the ammonia with the flue gas entering the denitrification reaction tower. The catalyst layer is installed above the mixing device to accelerate the denitrification reaction. The ammonia escape monitor is located at the outlet of the denitrification reaction tower to monitor ammonia escape in real time. The ammonia recovery device is connected to the outlet of the denitrification reaction tower to recover unreacted ammonia. An opening and closing assembly is provided on the side wall of the denitrification reaction tower.

[0007] Furthermore, the opening and closing assembly includes an opening and closing platform, which is fixedly connected to the side wall of the denitrification reaction tower.

[0008] Furthermore, an opening and closing frame is fixedly connected to the side wall of the opening and closing platform, and a sealing plate is provided inside the opening and closing frame.

[0009] Furthermore, a connector is fixedly connected to the side wall of the sealing plate, and another connector is fixedly connected to the side wall of the opening and closing frame.

[0010] Furthermore, a rotating rod is rotatably connected between the plurality of the connecting members, and a side frame is rotatably connected to the side wall of the sealing plate.

[0011] Furthermore, a gear is fixedly connected to the side wall of the side frame, an electric push rod is fixedly connected to the side wall of the opening and closing frame, and a push table is fixedly connected to the output end of the electric push rod.

[0012] Furthermore, a rack is fixedly connected to the top of the push platform, and the rack meshes with the gear.

[0013] This utility model has the following beneficial effects:

[0014] 1. In this utility model, ammonia gas is first precisely injected through an ammonia injection component, and a mixing device promotes full mixing of ammonia gas and flue gas, providing favorable conditions for the reaction. The catalyst layer accelerates the denitrification reaction and improves the denitrification efficiency. The ammonia escape monitor monitors the ammonia escape at the outlet in real time, and the ammonia recovery equipment recovers unreacted ammonia gas in a timely manner, reducing ammonia emissions. Thus, flue gas denitrification is effectively achieved, ammonia escape is prevented, and environmental pollution is reduced.

[0015] 2. In this utility model, the electric push rod 14 pushes the push table 15 and the rack 16 on its top. The rack 16 further pushes the gear 13. Finally, the sealing plate 9 is displaced after being subjected to force, and the rotating rod 11 rotates synchronously inside the opening and closing frame 8 and the connecting piece 10 to change the tilt angle, so as to realize the convenient opening and closing of the sealing plate 9 to the opening and closing table 7, reduce downtime and improve maintenance efficiency. Attached Figure Description

[0016] Figure 1 This is a perspective view of a flue gas denitrification device for preventing ammonia escape proposed in this utility model;

[0017] Figure 2 This is a schematic diagram of the denitrification reaction tower structure of a flue gas denitrification device to prevent ammonia escape proposed in this utility model;

[0018] Figure 3 This is a schematic diagram of the opening and closing frame structure of a flue gas denitrification device to prevent ammonia escape proposed in this utility model.

[0019] Legend:

[0020] 1. Denitrification reaction tower; 2. Ammonia injection assembly; 3. Mixing device; 4. Catalyst layer; 5. Ammonia escape monitor; 6. Ammonia recovery equipment; 7. Opening and closing platform; 8. Opening and closing frame; 9. Sealing plate; 10. Connecting parts; 11. Rotating rod; 12. Side frame; 13. Gear; 14. Electric push rod; 15. Pushing table; 16. Rack. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Reference Figures 1-2 This utility model provides an embodiment of a flue gas denitrification device to prevent ammonia escape, comprising a denitrification reaction tower 1, an ammonia injection assembly 2, a mixing device 3, a catalyst layer 4, an ammonia escape monitor 5, and an ammonia recovery device 6. The ammonia injection assembly 2 is located at the bottom of the denitrification reaction tower 1 and is used to inject ammonia into the denitrification reaction tower 1. The mixing device 3 is located above the ammonia injection assembly 2 and can fully mix the ammonia with the flue gas entering the denitrification reaction tower 1. The catalyst layer 4 is installed above the mixing device 3 to accelerate the denitrification reaction. The ammonia escape monitor 5 is located at the outlet of the denitrification reaction tower 1 to monitor the ammonia escape in real time. The ammonia recovery device 6 is connected to the outlet of the denitrification reaction tower 1 to recover unreacted ammonia. The side wall of the denitrification reaction tower 1 is provided with an opening and closing assembly.

[0023] Specifically, after the flue gas containing nitrogen oxides flows into the denitrification reaction tower 1, the ammonia injection assembly 2 inside the tower starts working, injecting ammonia into the tower in a metered and uniform manner to ensure uniform distribution of ammonia so that the subsequent reaction can proceed efficiently. Next, the mixing device 3 located above the reaction tower uses multiple layers of staggered baffles arranged at certain angles to continuously separate, redirect, and mix the ammonia and flue gas during the flow process. This process promotes full contact and fusion of flue gas and ammonia, forming a uniform mixed gas and optimizing the reaction conditions. The fully mixed gas continues to flow upward and finally reaches the honeycomb structure. A catalyst layer 4, composed of active catalytic components supported on a ceramic carrier, allows nitrogen oxides to undergo a denitrification reaction with ammonia under the action of the catalyst. This reaction efficiently converts nitrogen oxides into nitrogen and water vapor. The resulting gas flows to the outlet of the denitrification reaction tower 1. An ammonia escape monitor 5 monitors the ammonia concentration in the outlet gas in real time. When the ammonia escape exceeds a set threshold, the ammonia recovery device 6 connected to the outlet will be activated immediately. The unreacted ammonia is captured and recovered by means of absorbent spraying or adsorbent adsorption, ensuring the high efficiency of the denitrification reaction and effectively preventing ammonia escape, thus reducing environmental pollution.

[0024] Reference Figure 3 The opening and closing assembly includes an opening and closing platform 7, which is fixedly connected to the side wall of the denitrification reaction tower 1. An opening and closing frame 8 is fixedly connected to the side wall of the opening and closing platform 7. A sealing plate 9 is provided inside the opening and closing frame 8. A rotating rod 11 is rotatably connected between multiple connecting parts 10. A side frame 12 is rotatably connected to the side wall of the sealing plate 9. A gear 13 is fixedly connected to the side wall of the side frame 12. An electric push rod 14 is fixedly connected to the side wall of the opening and closing frame 8. A push table 15 is fixedly connected to the output end of the electric push rod 14. A rack 16 is fixedly connected to the top of the push table 15. The rack 16 meshes with the gear 13.

[0025] Specifically, when it is necessary to open and close the denitrification reaction tower 1 for cleaning or to maintain the internal ammonia spray structure, the electric push rod 14 is first activated. The movement of the electric push rod 14 pushes the push platform 15, which in turn drives the rack 16 on the top of the push platform 15. The movement of the rack 16 further drives the gear 13 to rotate. The rotation of the gear 13 then drives the side frame 12 to rotate on the side wall of the sealing plate 9, pushing the sealing plate 9 upward. As the sealing plate 9 is displaced under force, the rotating rod 11 rotates synchronously inside the opening and closing frame 8 and the connecting piece 10. By rotating and changing the tilt angle of the rotating rod 11, the sealing plate 9 can smoothly realize the opening and closing operation of the opening and closing platform 7. This ensures that the sealing plate 9 can be easily opened and closed during equipment maintenance or cleaning, reducing equipment downtime and improving equipment maintenance efficiency, thus making the entire maintenance process more efficient.

[0026] Working Principle: Flue gas containing nitrogen oxides flows into the denitrification reaction tower 1. At this time, the ammonia injection assembly 2 at the bottom of the denitrification reaction tower 1 is activated, injecting ammonia gas quantitatively and evenly into the tower. Next, the mixing device 3 above is equipped with multiple layers of staggered, angled baffles. As the ammonia gas and flue gas pass through these baffles, the gases are continuously divided, redirected, and mixed, promoting thorough fusion and forming a homogeneous mixture, creating favorable conditions for subsequent reactions. The mixed gas continues to rise, reaching the catalyst layer 4, which consists of active catalytic components supported on a honeycomb ceramic carrier. Under the action of the catalyst, nitrogen oxides and ammonia undergo a denitrification reaction, efficiently converting into nitrogen and water. After the reaction, the gas reaches the outlet of the denitrification reaction tower 1. The ammonia escape monitor 5 monitors the ammonia content in real time. Once the ammonia escape exceeds the preset threshold, the ammonia recovery equipment 6 connected to the outlet is quickly activated. The unreacted ammonia is captured and recovered through methods such as absorbent spraying or adsorption, thereby achieving efficient denitrification and effectively preventing ammonia escape, reducing environmental pollution. When it is necessary to open and close the denitrification reaction tower 1 for cleaning or to maintain the internal ammonia spray structure, the electric push rod 14 is activated to push the push platform 15 and the rack 16 on its top. The rack 16 further pushes the gear 13, which causes the gear 13 to drive the side frame 12 to rotate on the side wall of the sealing plate 9 and lift the sealing plate 9. After the sealing plate 9 is subjected to force, it is displaced and causes the rotating rod 11 to rotate synchronously inside the opening and closing frame 8 and the connecting part 10, changing the tilt angle. This enables the sealing plate 9 to be conveniently opened and closed to the opening and closing platform 7, reducing downtime and improving maintenance efficiency.

[0027] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is 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 modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A device for preventing ammonia escape in flue gas denitration, comprising a denitration reaction tower (1), an ammonia gas injection assembly (2), a mixing device (3), a catalyst layer (4), an ammonia escape monitor (5) and an ammonia gas recovery device (6), characterized in that: The ammonia injection assembly (2) is arranged at the bottom of the denitration reaction tower (1) and is used for injecting ammonia into the denitration reaction tower (1); the mixing device (3) is located above the ammonia injection assembly (2) and can mix the ammonia with flue gas entering the denitration reaction tower (1); the catalyst layer (4) is installed above the mixing device (3) and accelerates the denitration reaction; the ammonia escape monitor (5) is arranged at the outlet of the denitration reaction tower (1) and can monitor the ammonia escape in real time; the ammonia recovery equipment (6) is connected with the outlet of the denitration reaction tower (1) and recovers and processes the unreacted ammonia, and the side wall of the denitration reaction tower (1) is provided with an opening and closing assembly.

2. The device for flue gas denitration and preventing ammonia escape according to claim 1, characterized in that: The opening and closing assembly comprises an opening and closing table (7), and the opening and closing table (7) is fixedly connected to the side wall of the denitration reaction tower (1).

3. The device for flue gas denitration and preventing ammonia escape according to claim 2, characterized in that: The side wall of the opening and closing table (7) is fixedly connected with an opening and closing frame (8), and the opening and closing frame (8) is internally provided with a sealing plate (9).

4. The device for flue gas denitration and preventing ammonia escape according to claim 3, characterized in that: The side wall of the sealing plate (9) is fixedly connected with a connecting piece (10), and the side wall of the opening and closing frame (8) is fixedly connected with another connecting piece (10).

5. The device for flue gas denitration and preventing ammonia escape according to claim 4, characterized in that: A rotating rod (11) is rotatably connected between a plurality of connecting pieces (10), and the side wall of the sealing plate (9) is rotatably connected with a side frame (12).

6. The device for flue gas denitration and preventing ammonia escape according to claim 5, characterized in that: The side wall of the side frame (12) is fixedly connected with a gear (13), the side wall of the opening and closing frame (8) is fixedly connected with an electric push rod (14), and the output end of the electric push rod (14) is fixedly connected with a push table (15).

7. The device for flue gas denitration and preventing ammonia escape according to claim 6, characterized in that: The top of the push table (15) is fixedly connected with a rack (16), and the rack (16) is engaged with the gear (13).

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