Flue gas denitration system
By injecting ammonia gas outside the furnace and setting up ammonia spray grilles and spoilers in the reaction tank, the problems of uncontrollable ammonia gas volume and insufficient reaction in traditional flue gas denitrification systems are solved, and efficient nitrogen oxide removal effect is achieved , reducing resource waste.
Patent Information
- Application Number
- CN202421096685.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-20
- Publication Date
- 2025-01-14
- Estimated Expiration
- 2034-05-20
AI Technical Summary
In traditional flue gas denitrification systems, the amount of ammonia in the reaction tank is uncontrollable, and the reaction between ammonia and nitrogen oxides is insufficient, resulting in the unsatisfactory nitrogen oxide removal effect and serious waste of resources.
The ammonia gas is injected outside the furnace, and an ammonia spray grid and a spoiler are installed in the first reaction chamber. The ammonia gas is uniformly sprayed into the reaction tank through the ammonia gas delivery pipeline to ensure that the ammonia gas fully reacts with nitrogen oxides. Multiple reaction chambers and catalyst support frames improve reaction efficiency.
Controllable injection of ammonia gas and efficient removal of nitrogen oxides are achieved, reducing resource waste and improving the flue gas treatment effect.
Smart Images
Figure CN222342469U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of environmental protection technology, and more specifically, to a flue gas denitrification system. Background Art
[0002] With the improvement of environmental awareness and the tightening of environmental regulations, the removal of nitrogen oxides in flue gas is very important. The traditional denitrification method is to add urea to the reaction tank, and then urea is pyrolyzed to produce ammonia to remove nitrogen oxides in flue gas. However, the amount of ammonia in the reaction tank of the traditional denitrification method is uncontrollable and easily affected by the boiler operating conditions. The reaction is incomplete, resulting in a waste of resources. Secondly, the reaction of ammonia and nitrogen oxides is not sufficient, resulting in unsatisfactory nitrogen oxide removal effect. Therefore, the development of an efficient and stable nitrogen oxide denitrification system is of great significance to improving the flue gas treatment effect and protecting the environment. Utility Model Content
[0003] The utility model provides a flue gas denitration system, which solves the problem of uncontrollable ammonia amount in the reaction tank, insufficient reaction of ammonia with nitrogen oxides, and unsatisfactory nitrogen oxide removal effect by injecting ammonia outside the furnace and cooperating with a baffle in the first reaction chamber.
[0004] The utility model is realized through the following technical solutions.
[0005] A flue gas denitrification system comprises: a urea pyrolysis device, a reaction tank is arranged on one side of the urea pyrolysis device, the reaction tank comprises a first reaction chamber and a second reaction chamber, the first reaction chamber is connected with the second reaction chamber through a horizontal downward tapered hole, an air inlet 1 and an air inlet 2 are fixedly arranged on the first reaction chamber, the urea pyrolysis device is connected with the air inlet 1 through an ammonia delivery pipeline, the air inlet 2 is connected with a flue gas delivery channel, an ammonia spraying grid is arranged on the ammonia delivery pipeline, and an air pump is arranged between the ammonia delivery pipeline between the reaction tank and the urea pyrolysis device.
[0006] Flue gas is introduced into the second air inlet of the reaction tank, and the flue gas enters the first reaction chamber. Urea in the urea pyrolysis device is pyrolyzed into ammonia and water. Ammonia enters the ammonia delivery pipeline and is transported to the first reaction chamber by an air pump. An ammonia spray grid is arranged in the ammonia delivery pipeline. In order to make the ammonia diffuse evenly in the reactor, the spoiler in the first reaction chamber makes the ammonia fully react with the nitrogen oxides in the flue gas to remove the nitrogen oxides in the flue gas. The flue gas in the first reaction chamber passes through the cone hole and enters the second reaction chamber to react again, thereby improving the removal effect of nitrogen oxides in the flue gas.
[0007] In a further technical solution, in order to make the ammonia gas sprayed evenly, the ammonia spray grid includes a grid support, on which a plurality of branch pipes are installed, on which a plurality of nozzles are evenly spaced, and the branch pipes are connected to the ammonia gas delivery pipeline.
[0008] Furthermore, in order to allow ammonia to fully react with nitrogen oxides in the flue gas, a plurality of downward-inclined spoilers are fixedly provided at equal intervals on the first reaction chamber, and the angle between the spoiler and the inner wall of the first reaction chamber is 40° to 45°
[0009] Furthermore, in order to prevent ammonia leakage, the ammonia delivery pipeline is made of corrosion-resistant and high-temperature resistant materials.
[0010] Furthermore, in order to facilitate the placement of the catalyst, a catalyst support frame is fixedly provided in the first reaction chamber and the second reaction chamber.
[0011] Furthermore, in order to facilitate the reaction between nitrogen oxides and ammonia in the flue gas, the catalyst support frame is in a mesh shape.
[0012] Furthermore, in order to facilitate the discharge of the gas after the reaction and the water in the second reaction chamber, a drain port is provided at the bottom of the second reaction chamber, and an exhaust port is provided at one side of the second reaction chamber.
[0013] The technical effects of the utility model are:
[0014] The present application adopts the method of injecting ammonia outside the furnace, and injects the ammonia generated by the urea pyrolysis device into the reaction tank stably and evenly at the ammonia spraying grid, and then sets a baffle in the first reaction chamber to make the ammonia and nitrogen oxides react fully. The urea pyrolysis device is set to achieve controllable ammonia amount introduced into the reaction tank, reduce resource waste, and improve the removal effect of nitrogen oxides in flue gas. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 This is a schematic diagram of the structure of the reaction tank of the utility model;
[0016] Figure 2 It is a schematic diagram of the overall structure of the utility model;
[0017] Figure 3 This is a schematic diagram of the internal structure of the reaction tank of the utility model;
[0018] Figure 4 It is a schematic diagram of the enlarged structure of local A of the utility model;
[0019] Figure 5 This is a schematic diagram of the structure of the reaction tank of the utility model without the catalyst inside;
[0020] In the figure: 1. urea pyrolysis device; 2. reaction tank; 201. first reaction chamber; 202. second reaction chamber; 203. conical hole; 204. spoiler; 205. air inlet 1; 206. air inlet 2; 207. drain outlet; 208. exhaust outlet; 3. ammonia delivery pipeline; 4. ammonia spraying grid; 401. grid bracket; 402. branch pipe; 403. nozzle; 5. air pump; 6. catalyst support frame; 7. catalyst. DETAILED DESCRIPTION
[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other technical solutions can be obtained based on the provided drawings without paying creative work.
[0022] Example 1
[0023] Combination Figure 1 to Figure 4 The utility model is a flue gas denitrification system, comprising: a urea pyrolysis device 1, a reaction tank 2 is provided on one side of the urea pyrolysis device 1, the reaction tank 2 comprises a first reaction chamber 201 and a second reaction chamber 202, the first reaction chamber 201 is connected with the second reaction chamber 202 through a horizontal downward tapered hole 203, an air inlet 1 205 and an air inlet 206 are fixedly provided on the first reaction chamber 201, the urea pyrolysis device 1 is connected with the air inlet 1 205 through an ammonia delivery pipeline 3, the air inlet 206 is connected with the flue gas delivery channel, and the ammonia delivery pipeline 3 is provided with an ammonia spraying grid 4, an air pump 5 is provided between the ammonia delivery pipeline 3 between the reaction tank 2 and the urea pyrolysis device 1, the ammonia spraying grid 4 includes a grid support 401, a plurality of branch pipes 402 are installed on the grid support 401, a plurality of nozzles 403 are evenly spaced on the branch pipes 402, the branch pipes 402 are connected with the ammonia delivery pipeline 3, a catalyst support frame 6 is fixedly provided in the first reaction chamber 201 and the second reaction chamber 202, a drain outlet 207 is provided at the bottom of the second reaction chamber 202, and an exhaust port 208 is provided on one side of the second reaction chamber 202.
[0024] During the implementation process, urea is thermally decomposed into water and ammonia in the urea pyrolysis device 1, and the ammonia enters the ammonia delivery pipeline 3. The air pump 5 allows the ammonia to pass through the branch pipe 402 of the ammonia spray grid 4 and spray out from the nozzle 403, and then enter the first reaction chamber 201 from the air inlet 205 of the reaction tank 2. The ammonia spray grid 4 allows the ammonia to evenly enter the first reaction chamber 201 in the reaction tank 2, and the flue gas flows into the air inlet 206 of the reaction tank 2 through the flue gas delivery channel, and then enters the first reaction chamber 201. A catalyst 7 is placed on the catalyst support frame 6 in the first reaction chamber 201. Under the action of the catalyst, the ammonia reacts with the nitrogen oxides in the flue gas to remove the nitrogen oxides in the flue gas, and the disturbance in the first reaction chamber 201 is removed. The flow plate 204 can change the flow direction of the airflow and increase the turbulence of the airflow, thereby promoting the full mixing and reaction of ammonia and nitrogen oxides in the flue gas, which is helpful to improve the removal effect of nitrogen oxides in the flue gas. The ammonia and flue gas in the first reaction chamber 201 pass through the conical hole 203 to mix the ammonia and unreacted nitrogen oxides in the flue gas and enter the second reaction chamber 202. The second reaction chamber 202 is also provided with a catalyst 7 to make the ammonia and unreacted nitrogen oxides in the flue gas react again to ensure that the ammonia and nitrogen oxides in the flue gas react fully and improve the removal effect. The flue gas treated with denitrification is discharged from the exhaust port 208, and the water generated by the reaction of ammonia and nitrogen oxides in the flue gas is discharged from the drain port 207 of the second reaction chamber 202.
[0025] Example 2
[0026] Combination Figure 5 On the basis of the first embodiment, the ammonia delivery pipeline 4 is made of corrosion-resistant and high-temperature-resistant materials, and the catalyst support frame 6 is in a mesh shape.
[0027] During the implementation process, ammonia coming out of the urea pyrolysis device 1 has a certain temperature and is corrosive, so the ammonia delivery pipeline 3 is made of corrosion-resistant and high-temperature resistant materials, and the catalyst support frame 6 is mesh-shaped to allow ammonia and nitrogen oxides in the flue gas to react fully.
[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solution recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solution to deviate from the scope of the technical solution of the embodiments of the utility model.
Claims
1. A flue gas denitrification system, characterized in that: include: A urea pyrolysis device (1) is provided with a reaction tank (2) on one side of the urea pyrolysis device (1). The reaction tank (2) comprises a first reaction chamber (201) and a second reaction chamber (202). The first reaction chamber (201) and the second reaction chamber (202) are connected via a horizontal downward tapered hole (203). An air inlet 1 (205) and an air inlet 2 (206) are fixedly provided on the first reaction chamber (201). The urea pyrolysis device (1) is connected to the air inlet 1 (205) via an ammonia delivery pipeline (3). The air inlet 2 (206) is connected to a flue gas delivery channel. An ammonia spraying grid (4) is provided on the ammonia delivery pipeline (3). An air pump (5) is provided between the ammonia delivery pipeline (3) between the reaction tank (2) and the urea pyrolysis device (1).
2. A flue gas denitrification system according to claim 1, characterized in that: The ammonia spray grid (4) comprises a grid support (401), a plurality of branch pipes (402) are installed on the grid support (401), a plurality of nozzles (403) are arranged at equal intervals on the branch pipes (402), and the branch pipes (402) are connected to the ammonia delivery pipeline (3).
3. A flue gas denitrification system according to claim 1, characterized in that: A plurality of downwardly inclined spoilers (204) are fixedly provided at equal intervals on the first reaction chamber (201), and the spoilers (204) form an angle of 40° to 45° with the inner wall of the first reaction chamber (201).
4. A flue gas denitrification system according to claim 1, characterized in that: The ammonia delivery pipeline (3) is made of corrosion-resistant and high-temperature-resistant materials.
5. A flue gas denitrification system according to claim 1, characterized in that: A catalyst support frame (6) is fixedly provided in each of the first reaction chamber (201) and the second reaction chamber (202).
6. A flue gas denitrification system according to claim 5, characterized in that: The catalyst support frame (6) is in a mesh shape.
7. A flue gas denitrification system according to claim 1, characterized in that: A drain port (207) is provided at the bottom of the second reaction chamber (202), and an exhaust port (208) is provided at one side of the second reaction chamber (202).