Electrically calcined coal waste gas denitration device
By introducing a preheater, mixer, and multi-layer catalyst into the denitrification device for calcined coal exhaust gas, the problem of low inertia of ammonia gas injected into the spray gun was solved, achieving full mixing and conversion of NOx in the exhaust gas, improving denitrification efficiency and reducing costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-17
- Publication Date
- 2026-03-31
AI Technical Summary
In existing electrocalcining waste gas denitrification devices, the ammonia gas injected by the spray gun has low inertia and cannot be fully mixed with the flue gas, resulting in serious loss of reducing agent, high denitrification cost and poor effect.
A structure including a preheater, a mixer, and a multi-layer catalyst was designed. The preheater preheats the waste gas, the mixer mixes the ammonia water with the flue gas evenly, and then the multi-layer catalyst converts it into harmless substances. The reaction is carried out using catalysts made of titanium dioxide, vanadium pentoxide, and molybdenum trioxide.
It achieves full mixing and conversion of NOx in exhaust gas, reduces the loss of reducing agent, improves denitrification effect and reduces cost.
Smart Images
Figure CN224057091U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of flue gas treatment equipment, specifically relating to a denitrification device for flue gas from electric calcined coal. Background Technology
[0002] The electro-calcining exhaust gas denitrification unit is a device used to treat nitrogen oxide (NOx) emissions from industrial waste gas, mainly applied in thermal power plants, petrochemical, steel, and chemical industries. Its core technology is SCR (Selective Catalytic Reduction) technology, which involves injecting a urea aqueous solution into the exhaust gas emitted from combustion, using a catalyst to convert NOx into harmless nitrogen and water vapor.
[0003] Most existing denitrification devices for calcined coal exhaust gas use spray guns on both sides of the boiler channel to fully mix the liquid with the flue gas. However, the ammonia gas injected into the spray gun has low inertia and a limited spray distance, which makes it difficult to fully mix and react with the flue gas, resulting in a large loss of reducing agent, excessive denitrification cost and poor effect. Therefore, we propose a denitrification device for calcined coal exhaust gas. Utility Model Content
[0004] The purpose of this invention is to provide a denitrification device for calcined coal exhaust gas to solve the problems mentioned in the background art.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a denitrification device for calcined coal waste gas, comprising a preheater, an air inlet connected to the top of the preheater, a connecting pipe on one side of the preheater, a pipeline at one end of the connecting pipe, a main water pipe on the outside of the pipeline, a through pipe above the pipeline, a tower body at one end of the through pipe, a fan at the bottom of the tower body, an air outlet at the bottom of the fan, a nozzle pipe on the inside of the pipeline, a first mixer layer and a second mixer layer on the inside of the pipeline, and a rectifier heater, a first catalyst, a second catalyst, a third catalyst and a spare catalyst sequentially arranged on the inside of the tower body.
[0006] Preferably, the preheater and the pipeline are connected by a connecting pipe, and the main water pipe is connected to an external ammonia tank.
[0007] Preferably, the upper part of the pipe is connected to the tower body via a connecting pipe, and a fan is fixedly installed at the bottom of the tower body.
[0008] Preferably, the bottom of the fan is fixedly connected to an air outlet, and the nozzle pipe is connected to the main water pipe.
[0009] Preferably, a first layer of mixers is fixedly installed on the upper inner side of the pipe, and a second layer of mixers is provided below the first layer of mixers.
[0010] Preferably, a rectifier heater is installed on the upper inner side of the tower body, a first catalyst is disposed below the rectifier heater, a second catalyst is disposed below the first catalyst, a third catalyst is disposed below the second catalyst, and a spare catalyst is disposed below the third catalyst.
[0011] Compared with the prior art, the beneficial effects of this utility model are:
[0012] The heating structure, mixer, and catalyst structure allow for thorough mixing of the nitrates in the exhaust gas, preventing the loss of a large amount of reducing agent and further improving the denitrification effect of the device. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0014] Figure 2 This is a schematic diagram of the front cross-section structure of this utility model.
[0015] In the diagram: 1. Preheater; 2. Air inlet; 3. Connecting pipe; 4. Pipeline; 5. Main water pipe; 6. Through pipe; 7. Tower body; 8. Fan; 9. Air outlet; 10. Nozzle pipe; 11. Mixer layer 1; 12. Mixer layer 2; 13. Rectifier heater; 14. First catalyst; 15. Second catalyst; 16. Third catalyst; 17. Backup catalyst. Detailed Implementation
[0016] 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.
[0017] Please see Figure 1-2 This utility model provides a technical solution: a denitrification device for calcined coal waste gas, including a preheater 1, an air inlet 2 connected to the top of the preheater 1, a connecting pipe 3 on one side of the preheater 1, a pipe 4 at one end of the connecting pipe 3, a main water pipe 5 on the outside of the pipe 4, a through pipe 6 above the pipe 4, a tower body 7 at one end of the through pipe 6, a fan 8 at the bottom of the tower body 7, an air outlet 9 at the bottom of the fan 8, a nozzle pipe 10 on the inside of the pipe 4, a first mixer layer 11 and a second mixer layer 12 on the inside of the pipe 4, and a rectifier heater 13, a first catalyst 14, a second catalyst 15, a third catalyst 16 and a spare catalyst 17 arranged sequentially on the inside of the tower body 7.
[0018] Specifically, the preheater 1 and the pipe 4 are connected by a connecting pipe 3. The main water pipe 5 is connected to the external ammonia tank. The top of the pipe 4 is connected to the tower body 7 by a connecting pipe 6. A fan 8 is fixedly installed at the bottom of the tower body 7. An air outlet 9 is fixedly connected to the bottom of the fan 8. The nozzle pipe 10 is connected to the main water pipe 5. A first-layer mixer 11 is fixedly installed on the upper inner side of the pipe 4. A second-layer mixer 12 is installed below the first-layer mixer 11. A rectifier heater 13 is installed on the upper inner side of the tower body 7. A first catalyst 14 is installed below the rectifier heater 13. A second catalyst 15 is installed below the first catalyst 14. A third catalyst 16 is installed below the second catalyst 15. A spare catalyst 17 is installed below the third catalyst 16.
[0019] In this embodiment, after the exhaust gas is connected to the exhaust pipe of the equipment through the air inlet 2, the exhaust gas enters the interior of the preheater 1 to increase the gas temperature. Then, it enters the interior of the pipe 4 through the connecting pipe 3. At this time, ammonia water will be sprayed out from the nozzle pipe 10. Under the action of the first mixer layer 11 and the second mixer layer 12, it will be evenly mixed with the flue gas. Then, it will enter the interior of the tower body 7 through the through pipe 6. The flue gas can be heated to 300 to 400 degrees Celsius by the rectifier heater 13. Then, under the action of the first catalyst 14, the second catalyst 15, the third catalyst 16 and the spare catalyst 17, ammonia water and water will be generated. Then, it will be discharged from the tower body 7 by the fan 8 through the exhaust port 9.
[0020] The first catalyst 14, the second catalyst 15, the third catalyst 16, and the backup catalyst 17 are made of titanium dioxide and mixed with vanadium pentoxide, molybdenum trioxide, and tungsten trioxide.
[0021] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A device for denitration of waste gas from electrically calcined coal, comprising a preheater (1), characterized in that: The upper side of the preheater (1) is connected with the air inlet (2), one side of the preheater (1) is equipped with the connecting pipe (3), one end of the connecting pipe (3) is equipped with the pipeline (4), the outer side of the pipeline (4) is equipped with the main water pipe (5), the upper side of the pipeline (4) is equipped with the through pipe (6), one end of the through pipe (6) is equipped with the tower body (7), the bottom of the tower body (7) is equipped with the fan (8), the bottom of the fan (8) is equipped with the air outlet (9), the inner side of the pipeline (4) is equipped with the nozzle pipe (10), the inner side of the pipeline (4) is equipped with the mixer layer one (11) and the mixer layer two (12), the inner side of the tower body (7) is sequentially equipped with the rectifier heater (13), the first catalyst (14), the second catalyst (15), the third catalyst (16) and the standby catalyst (17).
2. The electrically-grinding-coal waste gas denitration device according to claim 1, characterized in that: The preheater (1) and the pipeline (4) are connected through the connecting pipe (3), the main water pipe (5) is connected with the ammonia water tank outside.
3. The electrically-grinding-coal waste gas denitration device according to claim 1, characterized in that: The upper side of the pipeline (4) and the tower body (7) are connected through the through pipe (6), the bottom of the tower body (7) is fixedly installed with the fan (8).
4. The electrically-grinding-coal waste gas denitration device according to claim 1, characterized in that: The bottom of the fan (8) is fixedly connected with the air outlet (9), the nozzle pipe (10) is connected with the main water pipe (5).
5. The electrically-grinding-coal waste gas denitration device according to claim 1, characterized in that: The inner side of the pipeline (4) is fixedly installed with the mixer layer one (11) on the upper side, the lower side of the mixer layer one (11) is equipped with the mixer layer two (12).
6. The electrically-grinding-coal waste gas denitration device according to claim 1, characterized in that: The inner side of the tower body (7) is installed with the rectifier heater (13) on the upper side, the lower side of the rectifier heater (13) is provided with the first catalyst (14), the lower side of the first catalyst (14) is provided with the second catalyst (15), the lower side of the second catalyst (15) is provided with the third catalyst (16), the lower side of the third catalyst (16) is provided with the standby catalyst (17).