Flue gas denitration ammonia injection device

Abstract

This utility model relates to a flue gas denitrification ammonia injection device, including a support frame and an ammonia water evaporator. The ammonia water evaporator is fixed on the support frame and includes an air inlet, an air outlet, and a feed inlet. A hot steam supply component is connected to the air inlet, an ammonia water supply component is connected to the feed inlet, and an air outlet pipe is connected to the air outlet. An ammonia injection grid is provided on the air outlet pipe. The advantages of this utility model are: the ammonia water is converted into ammonia gas through the ammonia water evaporator, enabling 100% atomization and evaporation of the ammonia water, ensuring the ammonia gas generation efficiency. The converted ammonia gas can be sprayed into the flue gas through the air outlet pipe and the ammonia injection grid. The ammonia injection grid can achieve uniform spraying of ammonia gas, thereby better utilizing the catalyst and allowing ammonia gas to fully contact and react with nitrogen oxides, thereby improving the conversion rate of nitrogen oxides, thus improving the overall denitrification efficiency and reducing the emission concentration of nitrogen oxides.

Description

Technical Field

[0001] This utility model relates to a flue gas denitrification and ammonia injection device. Background Technology

[0002] SCR (Selective Catalytic Reduction) flue gas denitrification technology utilizes ammonia as a reducing agent to react with nitrogen oxides in flue gas under the action of a catalyst, producing harmless nitrogen and water, thereby achieving denitrification. SCR is currently a relatively mature flue gas treatment process for removing nitrogen oxides from flue gas. Ammonia is a commonly used reducing agent in SCR flue gas denitrification; ensuring the uniform distribution of ammonia-containing gas within the flue gas duct section before the denitrification reactor is crucial for achieving effective denitrification and high denitrification efficiency.

[0003] Traditional ammonia injection systems suffer from problems such as uneven ammonia atomization, low ammonia vaporization efficiency, low reducing agent utilization, and high ammonia escape rate. These issues not only affect denitrification efficiency but may also lead to secondary pollution, such as the potential harm of ammonia to the environment and human health. Utility Model Content

[0004] The purpose of this invention is to solve the problem of uneven ammonia atomization in existing ammonia injection systems, which affects denitrification efficiency. This invention proposes a flue gas denitrification ammonia injection device that converts ammonia water into ammonia gas through an ammonia water evaporator, enabling 100% atomization and evaporation of the ammonia water and ensuring efficient ammonia production. The ammonia gas is then injected into the flue gas through an ammonia injection grid, which ensures uniform ammonia spraying and better utilizes the catalyst, allowing for sufficient contact and reaction between ammonia gas and nitrogen oxides. This improves the conversion rate of nitrogen oxides, thereby enhancing the overall denitrification efficiency and reducing the emission concentration of nitrogen oxides.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: a flue gas denitrification ammonia injection device, applied to a flue gas pipeline, the flue gas denitrification ammonia injection device includes a support and an ammonia water evaporator, the ammonia water evaporator is fixed on the support, the ammonia water evaporator includes an air inlet, an air outlet and a feed inlet, the air inlet is connected to a hot steam supply component for conveying hot steam into the ammonia water evaporator, the feed inlet is connected to an ammonia water supply component for conveying ammonia water into the ammonia water evaporator, the air outlet is connected to an air outlet pipe, the air outlet pipe is provided with an ammonia injection grid, and the ammonia injection grid is installed inside the flue gas pipeline.

[0006] Preferably, the hot steam supply assembly includes a steam heater, a dilution fan, and a first connecting pipe. The dilution fan is connected to the steam heater, one end of the first connecting pipe is connected to the steam heater, and the other end of the first connecting pipe is connected to an air inlet. One end of the steam heater is connected to an air inlet pipe for supplying steam to the steam heater, and one end of the steam heater is connected to an exhaust pipe for discharging saturated steam.

[0007] Preferably, the hot steam supply assembly further includes a temperature regulation assembly, which includes a controller and a temperature regulator connected to the controller, both of which are connected to the steam heater.

[0008] Preferably, the ammonia supply assembly includes a nozzle, an ammonia pipe, and an air pipe. The nozzle is provided with a mixing pipe, and both the ammonia pipe and the air pipe are connected to the mixing pipe.

[0009] Preferably, the ammonia water pipeline is equipped with a flow regulating valve.

[0010] Preferably, the ammonia water pipeline is connected to an inlet pipe for supplying demineralized water to the ammonia water, and the inlet pipe is equipped with a first control valve.

[0011] Preferably, the air outlet is provided with a U-shaped pipe for installing an air outlet pipe.

[0012] Preferably, the bracket is provided with a mounting bracket for fixing the air outlet pipe.

[0013] Preferably, the ammonia spraying grid includes a gas supply pipe, a gas outlet pipe, and a second connecting pipe disposed between the gas supply pipe and the gas outlet pipe. The gas outlet pipe is provided with a plurality of gas outlet nozzles, and both the gas supply pipe and the gas outlet pipe are provided with protective plates.

[0014] Preferably, the outlet pipe is provided with a vent pipe connected to the gas supply pipe, and the vent pipe is provided with a second control valve.

[0015] In summary, the advantages of this invention are as follows: Ammonia water is converted into ammonia gas through an ammonia water evaporator, enabling 100% atomization and evaporation of the ammonia water, thus ensuring high ammonia gas production efficiency. Because the outlet of the ammonia water evaporator is connected to an outlet pipe, and an ammonia spraying grid is installed inside the flue gas duct, the converted ammonia gas can be sprayed into the flue gas through the outlet pipe and the ammonia spraying grid. The ammonia spraying grid ensures uniform ammonia spraying, thereby better utilizing the catalyst and allowing ammonia gas to fully contact and react with nitrogen oxides, thus improving the conversion rate of nitrogen oxides and enhancing the overall denitrification efficiency by 10-15%. This also reduces the emission concentration of nitrogen oxides. Furthermore, ammonia spraying effectively reduces the resistance within the flue gas duct. Ammonia gas is directly installed in the flue gas duct through the outlet pipe, effectively preventing ammonia escape. Secondly, hot steam is supplied to the ammonia water evaporator through the hot steam supply component, and ammonia water is supplied to the ammonia water evaporator through the ammonia water supply component. Therefore, continuous supply of hot steam and ammonia water can be achieved. No additional heating source is required on the ammonia water evaporator during operation, resulting in low operating costs. Moreover, the hot steam can be boiler hot steam, thus realizing the recovery and utilization of waste heat and achieving energy saving and consumption reduction. Finally, the ammonia water evaporator is mounted on a support, which provides stable support for the ammonia water evaporator, reducing the shaking or displacement of the equipment caused by external factors, ensuring the stability of equipment operation, and facilitating subsequent inspection and maintenance, meeting different installation requirements. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings:

[0017] Figure 1 This is a schematic diagram of the structure of a flue gas denitrification ammonia injection device according to the present invention;

[0018] Figure 2 This is a schematic diagram of the structure of the hot steam supply component of this utility model;

[0019] Figure 3 This is a schematic diagram of the ammonia supply component in this utility model;

[0020] Figure 4 This is a schematic diagram of the structure of the ammonia injection grid in this utility model.

[0021] Figure label:

[0022] 1. Bracket, 11. Mounting rack, 2. Ammonia evaporator, 21. Air inlet, 22. Air outlet, 23. Feed inlet, 24. U-tube, 3. Hot steam supply assembly, 31. Steam heater, 32. Dilution fan, 33. First connecting pipe, 34. Air inlet pipe, 35. Exhaust pipe, 36. Temperature control assembly, 37. Controller, 38. Temperature regulator, 4. Ammonia supply assembly, 41. Nozzle, 42. Ammonia pipeline, 43. Air pipeline, 44. Mixing pipe, 45. Flow control valve, 46. Liquid inlet pipe, 47. First control valve, 5. Air outlet pipeline, 51. Vent pipe, 52. Second control valve, 6. Ammonia injection grille, 61. Gas delivery pipe, 62. Air outlet pipe, 63. Second connecting pipe, 64. Air outlet nozzle, 65. Protective plate, 7. Flue gas pipeline. Detailed Implementation

[0023] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, a flue gas denitrification ammonia injection device is applied to a flue gas pipeline. The flue gas denitrification ammonia injection device includes a support 1 and an ammonia water evaporator 2. The ammonia water evaporator 2 is fixed on the support 1. The ammonia water evaporator 2 includes an air inlet 21, an air outlet 22, and a feed inlet 23. A hot steam supply component 3 for supplying hot steam to the ammonia water evaporator 2 is connected to the air inlet 21. An ammonia water supply component 4 for supplying ammonia water to the ammonia water evaporator 2 is connected to the feed inlet 23. An air outlet pipe 5 is connected to the air outlet 22. An ammonia injection grille 6 is provided on the air outlet pipe 5 and is installed inside the flue gas pipeline.

[0024] Ammonia water is converted into ammonia gas through an ammonia evaporator, ensuring 100% atomization and evaporation of the ammonia water and maximizing ammonia production efficiency. Since the outlet of the ammonia evaporator is connected to an outlet pipe, and an ammonia injection grid is installed inside the flue gas duct, the converted ammonia gas is injected into the flue gas through the outlet pipe and the ammonia injection grid. The ammonia injection grid ensures uniform ammonia spraying, thereby better utilizing the catalyst and allowing ammonia gas to fully contact and react with nitrogen oxides, thus improving the conversion rate of nitrogen oxides and enhancing the overall denitrification efficiency by 10-15%. This reduces the emission concentration of nitrogen oxides, and the ammonia spraying effectively reduces the resistance within the flue gas duct. Furthermore, the ammonia gas is directly discharged through the outlet... The pipeline is installed inside the flue gas duct, effectively preventing ammonia escape. Secondly, hot steam is supplied to the ammonia evaporator via a hot steam supply component, and ammonia water is supplied to the ammonia evaporator via an ammonia water supply component. Therefore, continuous supply of hot steam and ammonia water is achieved. No additional heating source is needed for the ammonia evaporator during operation, resulting in low operating costs. Furthermore, the hot steam can utilize boiler steam, thus achieving waste heat recovery and energy saving. Finally, the ammonia evaporator is mounted on a support frame, which provides stable support, reducing shaking or displacement caused by external factors, ensuring stable operation, and facilitating subsequent inspection and maintenance, meeting various installation requirements.

[0025] The hot steam supply assembly 3 includes a steam heater 31, a dilution fan 32, and a first connecting pipe 33. The dilution fan 32 is connected to the steam heater 31. One end of the first connecting pipe 33 is connected to the steam heater 31, and the other end is connected to an air inlet 21. One end of the steam heater 31 is connected to an air inlet pipe 34 for supplying steam to the steam heater 31. In this embodiment, the air inlet pipe can be connected to a boiler, enabling the recycling of boiler steam, greatly reducing the energy consumption of the steam heater, and achieving energy saving and consumption reduction. One end of 1 is connected to an exhaust pipe 35 that discharges saturated steam. The hot steam supply component is configured as a steam heater, a dilution fan, and a first connecting pipe. Since the steam heater is connected to an inlet pipe and an exhaust pipe, the steam is heated by the steam heater, the dilution fan adjusts the steam concentration, and the first connecting pipe delivers the heated steam to the inlet of the ammonia evaporator. This ensures a stable supply of hot steam, prevents the dilution fan from causing ammonia leakage and environmental pollution, and also avoids corrosion of the dilution fan by ammonia, thus improving the service life of the dilution fan. The hot steam supply assembly 3 also includes a temperature regulation assembly 36. The temperature regulation assembly 36 includes a controller 37 and a temperature regulator 38 connected to the controller 37. Both the controller 37 and the temperature regulator 38 are connected to the steam heater 31. The temperature regulation assembly effectively regulates the temperature of the steam heater to meet different production needs. Specifically, the controller receives the temperature signal from the steam heater 31. When the received temperature signal is lower or higher than the set temperature, the controller sends a temperature regulation command to the temperature regulator. Upon receiving the command, the temperature regulator automatically adjusts the temperature of the steam heater, thus achieving automated temperature regulation. The controller and temperature regulator are existing technologies, and their specific structures are not described in detail in this embodiment.

[0026] The ammonia supply assembly 4 includes a nozzle 41, an ammonia pipe 42, and an air pipe 43. The nozzle 41 is equipped with a mixing pipe 44, and both the ammonia pipe 42 and the air pipe 43 are connected to the mixing pipe 44. By configuring the ammonia supply assembly as a nozzle, ammonia pipe, and air pipe, the mixing pipe on the nozzle allows for mixing of ammonia and air at the nozzle, promoting ammonia decomposition and improving ammonia utilization. Furthermore, the nozzle enables uniform ammonia spraying. In this embodiment, the nozzle and mixing pipe are connected by threads, allowing for quick installation and removal of the nozzle, facilitating cleaning and replacement. The ammonia pipe 42 is equipped with a flow regulating valve 45, which effectively regulates the flow rate within the ammonia pipe, ensuring the stability of the entire process and achieving precise control and regulation of ammonia gas to meet different production needs. The ammonia water pipeline 42 is connected to an inlet pipe 46 for supplying demineralized water to the ammonia water. The inlet pipe 46 is equipped with a first control valve 47. Supplying demineralized water to the ammonia water through the inlet pipe effectively adjusts the pH value of the ammonia water and dilutes its concentration, thereby improving reaction efficiency. Furthermore, the first control valve on the inlet pipe allows for precise control of its opening and closing, meeting various operational requirements. The gas outlet 22 is equipped with a U-shaped pipe 24 for mounting the gas outlet pipe 5. The U-shaped pipe prevents ammonia gas from flowing back into the evaporator, improving its overall service life, and also acts as a buffer, ensuring a smooth flow of ammonia gas into the gas outlet pipe. The support 1 is equipped with a mounting bracket 11 for fixing the gas outlet pipe 5. This mounting bracket simplifies the installation structure of the gas outlet pipe on the support and improves the stability of the gas outlet pipe.

[0027] The ammonia spraying grid 6 includes a gas supply pipe 61, a gas outlet pipe 62, and a second connecting pipe 63 disposed between the gas supply pipe 61 and the gas outlet pipe 62. The gas outlet pipe 62 is provided with a plurality of gas outlet nozzles 64. Both the gas supply pipe 61 and the gas outlet pipe 62 are provided with protective plates 65. The ammonia spraying grid is configured with a structure of a gas supply pipe, a gas outlet pipe, and a second connecting pipe. Since the gas outlet pipe is provided with a plurality of gas outlet nozzles, ammonia gas can be sprayed out through the gas outlet nozzles after passing through the gas supply pipe, the second connecting pipe, and the gas outlet pipe. The overall structure is compact and easy to install and disassemble. The gas outlet nozzles can ensure the uniformity of ammonia gas spraying, which greatly improves the ammonia spraying effect. Secondly, the setting of the protective plates can effectively reduce the wear of the gas supply pipe and the gas outlet pipe, and improve the service life of the entire ammonia spraying grid. The outlet pipe 5 is equipped with a vent pipe 51 connected to the gas supply pipe 61. The vent pipe 51 is equipped with a second control valve 52. The vent pipe is designed so that the flow rate and pressure of ammonia can be effectively adjusted, ensuring stable ammonia injection from the ammonia injection grid and improving safety performance.

[0028] In addition to the preferred embodiments described above, there are other embodiments of this utility model. Those skilled in the art can make various changes and modifications based on this utility model. As long as they do not depart from the spirit of this utility model, they should all fall within the scope defined by the appended claims.

Claims

1. A flue gas denitrification ammonia injection device, applied to a flue gas duct, characterized in that: The flue gas denitrification ammonia injection device includes a support (1) and an ammonia water evaporator (2). The ammonia water evaporator (2) is fixed on the support (1). The ammonia water evaporator (2) includes an air inlet (21), an air outlet (22), and a feed inlet (23). A hot steam supply component (3) for supplying hot steam to the ammonia water evaporator (2) is connected to the air inlet (21). An ammonia water supply component (4) for supplying ammonia water to the ammonia water evaporator (2) is connected to the feed inlet (23). An air outlet pipe (5) is connected to the air outlet (22). An ammonia injection grid (6) is provided on the air outlet pipe (5), and the ammonia injection grid is installed inside the flue gas pipe.

2. The flue gas denitrification ammonia injection device according to claim 1, characterized in that: The hot steam supply assembly (3) includes a steam heater (31), a dilution fan (32), and a first connecting pipe (33). The dilution fan (32) is connected to the steam heater (31). One end of the first connecting pipe (33) is connected to the steam heater (31), and the other end of the first connecting pipe (33) is connected to the air inlet (21). One end of the steam heater (31) is connected to an air inlet pipe (34) for supplying steam to the steam heater (31), and one end of the steam heater (31) is connected to an exhaust pipe (35) for discharging saturated steam.

3. The flue gas denitrification ammonia injection device according to claim 2, characterized in that: The hot steam supply assembly (3) also includes a temperature regulation assembly (36), which includes a controller (37) and a temperature regulator (38) connected to the controller. Both the controller (37) and the temperature regulator (38) are connected to the steam heater (31).

4. The flue gas denitrification ammonia injection device according to claim 1, characterized in that: The ammonia supply component (4) includes a nozzle (41), an ammonia pipe (42), and an air pipe (43). The nozzle (41) is provided with a mixing pipe (44), and the ammonia pipe (42) and the air pipe (43) are both connected to the mixing pipe (44).

5. The flue gas denitrification ammonia injection device according to claim 4, characterized in that: The ammonia water pipeline (42) is equipped with a flow regulating valve (45).

6. The flue gas denitrification ammonia injection device according to claim 4, characterized in that: The ammonia water pipeline (42) is connected to an inlet pipe (46) for conveying demineralized water into the ammonia water, and the inlet pipe (46) is equipped with a first control valve (47).

7. The flue gas denitrification ammonia injection device according to claim 1, characterized in that: The air outlet (22) is provided with a U-shaped pipe (24) for installing the air outlet pipe (5).

8. The flue gas denitrification ammonia injection device according to claim 7, characterized in that: The bracket (1) is provided with a mounting bracket (11) for fixing the air outlet pipe (5).

9. The flue gas denitrification ammonia injection device according to claim 1, characterized in that: The ammonia spraying grid (6) includes a gas supply pipe (61), a gas outlet pipe (62), and a second connecting pipe (63) disposed between the gas supply pipe (61) and the gas outlet pipe (62). The gas outlet pipe (62) is provided with a plurality of gas outlet nozzles (64), and both the gas supply pipe (61) and the gas outlet pipe (62) are provided with protective plates (65).

10. A flue gas denitrification ammonia injection device according to claim 9, characterized in that: The gas outlet pipe (5) is provided with a vent pipe (51) connected to the gas supply pipe (61), and the vent pipe (51) is provided with a second control valve (52).

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