High-temperature denitration device capable of removing ash and controlling ammonia for cement kiln tail gas

Abstract

The utility model relates to the technical field of cement kiln tail gas denitration, and discloses a cement kiln tail gas high-temperature denitration device capable of removing ash and controlling ammonia, which comprises an inlet pipe and a liquid storage tank, the bottom end of the right side of the inlet pipe is fixedly connected with a connecting pipe, and the top end of the right side of the inlet pipe is fixedly connected with a through pipe; a guide pipe is fixedly connected to the top end of the connecting pipe, two filter plates are fixedly connected to the left side of the interior of the guide pipe, a booster water pump is fixedly connected to the top end of the liquid storage tank, a liquid outlet pipe is fixedly connected to the output end of the booster water pump, and a half shell is rotatably connected to the interior of the top end of the liquid outlet pipe; the left side of the liquid outlet pipe is fixedly connected with a protective cover, and the middle of the protective cover is rotationally connected with a worm gear rod. According to the utility model, by adjusting the flow of ammonia water, the supply amount of a denitration reducing agent can be accurately controlled, ammonia escape or insufficiency is avoided, and meanwhile, the fan capable of rotating at multiple angles can more uniformly clean the surface of a catalyst and reduce accumulated dust or sediments, so that the activity of the catalyst is kept.

Description

Technical Field

[0001] This utility model relates to the technical field of cement denitrification, and in particular to a high-temperature denitrification device for cement kiln exhaust gas that can remove ash and control ammonia. Background Technology

[0002] With the maturation of nitrogen oxide (NOx) control in coal-fired power plants, more and more industries are being included in the ultra-low NOx emission requirements. Cement kiln flue gas NOx is the third largest source of pollution after thermal power plants and vehicle exhaust. The most prominent characteristic of cement kiln flue gas is its high dust concentration, reaching 60-120 g / Nm3, and it contains poisoning components such as alkaline earth metals. The dust particles are small, with 75-90% being smaller than 10 μm, making dust removal difficult. NH3-SCR has become a mature NOx removal technology due to its high denitrification efficiency and long catalyst life.

[0003] Existing denitrification devices suffer from several significant design flaws. Firstly, their overly simplistic designs often lack precise flow control mechanisms. Ammonia, a crucial reducing agent in the denitrification reaction, requires precise flow control to ensure reaction efficiency and minimize environmental pollution. However, these simple devices typically only feature basic pumping systems, failing to accurately regulate ammonia flow. This leads to waste and compromises denitrification effectiveness during operation. Furthermore, traditional denitrification equipment lacks effective cleaning mechanisms, causing dust and other deposits to accumulate on the catalyst surface—a core component of the denitrification reaction. These deposits clog the catalyst's micropores, reducing the reaction area and consequently lowering catalytic efficiency. Therefore, this paper proposes a high-temperature denitrification device for cement kiln exhaust gas, featuring dust removal and ammonia control, to address these issues. Utility Model Content

[0004] To overcome the above deficiencies, this utility model provides a high-temperature denitrification device for cleaning and controlling ammonia in cement kiln exhaust gas, aiming to improve the problems of simple design and lack of effective cleaning mechanism in some existing denitrification devices, which leads to ammonia waste, poor denitrification effect and reduced catalyst efficiency.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A high-temperature denitrification device for cleaning ash and controlling ammonia in cement kiln exhaust gas includes an inlet pipe and a storage tank. A connecting pipe is fixedly connected to the bottom right side of the inlet pipe, and a through pipe is fixedly connected to the top right side of the inlet pipe. A guide pipe is fixedly connected to the top of the connecting pipe. Two filter plates are fixedly connected to the left side of the inside of the guide pipe. A booster pump is fixedly connected to the top of the storage tank. An outlet pipe is fixedly connected to the output end of the booster pump. A half-shell is rotatably connected to the top of the outlet pipe. A protective cover is fixedly connected to the left side of the outlet pipe. A worm gear is rotatably connected to the middle of the protective cover. A worm is rotatably connected to the top left side of the outlet pipe. An inlet pipe is fixedly connected to the top of the outlet pipe. A water pipe is fixedly connected to the top of the inlet pipe. A spray plate is fixedly connected to the top of the water pipe. A reaction assembly is fixedly connected to the right side of the guide pipe.

[0007] As a further description of the above technical solution:

[0008] The reaction assembly includes a reaction chamber. The top of the reaction chamber is fixedly connected to the right side of the bottom end of the conduit. A heating motor is fixedly connected to the right side of the top of the reaction chamber. A heating tube is fixedly connected to the left side of the heating motor. Two catalyst plates are fixedly connected to the upper and lower sides inside the reaction chamber. A catalyst is fixedly connected to the middle of the reaction chamber. A drive motor is fixedly connected to the middle left side of the reaction chamber. A guide plate is fixedly connected to the drive end of the drive motor. An L-shaped rod is fixedly connected to the left side of the guide plate. A fan is fixedly connected to the left side of the L-shaped rod. A fixing frame is fixedly connected to the left side inside the reaction chamber. Square rings are rotatably connected to the upper and lower ends of the left side of the fixing frame. Rotating shafts are rotatably connected to the middle of the front and rear sides of the square rings.

[0009] As a further description of the above technical solution:

[0010] The left and right sides of the through pipe are fixedly connected to the bottom left side of the conduit, and the outside of the spray plate is fixedly connected to the inside left side of the conduit.

[0011] As a further description of the above technical solution:

[0012] The right end of the worm is fixedly connected to the left end of the half-shell, and the outer side of the worm wheel is meshed with the outer side of the worm.

[0013] As a further description of the above technical solution:

[0014] The top end of the water pipe is fixedly connected to the left end of the conduit, and the heating pipe is fixedly connected to the top end of the inside of the reaction chamber.

[0015] As a further description of the above technical solution:

[0016] The right side of the mounting bracket is fixedly connected to the inside right side of the reaction chamber;

[0017] As a further description of the above technical solution:

[0018] The two rotating shafts are fixedly connected to the front and rear sides of the fan on their adjacent sides.

[0019] As a further description of the above technical solution:

[0020] The right side of the guide plate is rotatably connected to the middle left side of the fixed frame, and the outside of the fan is rotatably connected to the inner wall of the square ring.

[0021] This utility model has the following beneficial effects:

[0022] 1. In this utility model, by rotating the worm gear and engaging the worm, the worm drives the fixed half-shell to rotate at the top of the inside of the liquid outlet pipe. This allows for precise control of the reducing agent supply by adjusting the ammonia flow rate, preventing ammonia escape or insufficiency, and improving the overall performance and economic benefits of the device.

[0023] 2. In this utility model, the L-shaped rod is driven by the start of the drive motor to pull the fan to rotate. Then, the fan is restricted to the middle of the square ring by the rotating shaft and the square ring to rotate flexibly at multiple angles. This allows the fan to rotate at multiple angles to clean the catalyst surface more evenly, reduce dust or deposits, and thus maintain the activity of the catalyst. Attached Figure Description

[0024] Figure 1 This is a three-dimensional schematic diagram of a high-temperature denitrification device for cleaning and controlling ammonia in cement kiln exhaust gas, as proposed in this utility model.

[0025] Figure 2 This is a schematic diagram of the reaction chamber of a high-temperature denitrification device for cleaning and controlling ammonia in cement kiln exhaust gas, as proposed in this utility model.

[0026] Figure 3 This is a schematic diagram of the storage tank of a high-temperature denitrification device for cleaning and controlling ammonia in cement kiln exhaust gas, as proposed in this utility model.

[0027] Figure 4 This is a schematic diagram of the liquid outlet pipe of a high-temperature denitrification device for cleaning and controlling ammonia in cement kiln exhaust gas, as proposed in this utility model.

[0028] Figure 5 This is a schematic diagram of the liquid inlet pipe of a high-temperature denitrification device for cleaning and controlling ammonia in cement kiln tail gas, as proposed in this utility model.

[0029] Figure 6 This is a schematic diagram of the drive motor of a high-temperature denitrification device for cleaning ash and controlling ammonia in cement kiln exhaust gas, as proposed in this utility model.

[0030] Legend:

[0031] 1. Inlet pipe; 2. Connecting pipe; 3. Through pipe; 4. Guide pipe; 5. Filter plate; 6. Storage tank; 7. Booster pump; 8. Outlet pipe; 9. Half-shell; 10. Protective cover; 11. Worm gear; 12. Worm; 13. Inlet pipe; 14. Water pipe; 15. Spray plate; 16. Reaction chamber; 17. Heating motor; 18. Heating tube; 19. Catalyst plate one; 20. Catalyst two; 21. Drive motor; 22. Guide plate; 23. L-shaped rod; 24. Fan; 25. Fixing frame; 26. Square ring; 27. Rotating shaft. Detailed Implementation

[0032] 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.

[0033] Reference Figures 1 to 3 This utility model provides an embodiment of a high-temperature denitrification device for cleaning and controlling ammonia in cement kiln exhaust gas. The device includes an inlet pipe 1 and a storage tank 6. A connecting pipe 2 is fixedly connected to the bottom right side of the inlet pipe 1, and a through pipe 3 is fixedly connected to the top right side of the inlet pipe 1. A conduit 4 is fixedly connected to the top of the connecting pipe 2. This design allows flue gas to flow smoothly from the inlet pipe 1 into the conduit 4. The through pipe 3 is fixedly connected to the bottom left side of the conduit 4 on both sides, assisting in the flow of flue gas and ensuring its uniform distribution within the device. Two filter plates 5 are fixedly connected to the left side of the inside of the conduit 4 for preliminary filtration of large particles in the flue gas, preventing damage to subsequent components. The design of the filter plates 5 considers both filtration efficiency and durability to ensure long-term stable operation.

[0034] refer to Figure 3 , Figure 4 A booster pump 7 is fixedly connected to the top of the storage tank 6. The storage tank 6 is used to store ammonia or other reducing agents, and the booster pump 7 is fixedly connected to its top. The tank body of the storage tank 6 is designed with airtightness and corrosion resistance in mind to ensure the safe storage of the reducing agent. A discharge pipe 8 is fixedly connected to the output end of the booster pump 7, which is used to draw ammonia from the storage tank 6 and transport it upwards. A half-shell 9 is rotatably connected to the top of the discharge pipe 8, and the rotation angle of the half-shell 9 determines the flow rate of the discharge. A protective cover 10 is fixedly connected to the left side of the discharge pipe 8, which protects the internal components. A worm gear 11 is rotatably connected to the middle of the protective cover 10, and the ammonia flow rate is controlled by the meshing of the worm gear 11.

[0035] refer to Figure 2 , Figure 5 A worm gear 12 is rotatably connected to the top left side of the outlet pipe 8. The right end of the worm gear 12 is fixedly connected to the left end of the half-shell 9. The worm gear 12 passes through the outlet pipe 8 and is fixedly connected to the half-shell 9. An inlet pipe 13 is fixedly connected to the top of the outlet pipe 8, and the top of the inlet pipe 13 covers the top of the outlet pipe 8. The outer side of the worm wheel 11 is meshed with the outer side of the worm gear 12. The ammonia flow rate is controlled by the meshing of the worm wheel 11 and the worm gear 12.

[0036] A water pipe 14 is fixedly connected to the top of the inlet pipe 13. The top of the water pipe 14 is fixedly connected to the left end of the conduit 4. A spray plate 15 is fixedly connected to the top of the water pipe 14. The spray plate 15 is fixedly connected to the left side of the inside of the conduit 4. Ammonia water flows into the spray plate 15 and is sprayed out through the inlet pipe 13 and the water pipe 14. The inlet pipe 13, the water pipe 14 and the spray plate 15 are all made of corrosion-resistant materials.

[0037] refer to Figure 2 , Figure 6 A reaction assembly is fixedly connected to the right side of the conduit 4. The reaction assembly includes a reaction chamber 16. The top of the reaction chamber 16 is fixedly connected to the right side of the bottom end of the conduit 4. A heating motor 17 is fixedly connected to the right side of the top of the reaction chamber 16. A heating tube 18 is fixedly connected to the left side of the heating motor 17. The outside of the heating tube 18 is fixedly connected to the top of the inside of the reaction chamber 16. The heating motor 17 is fixedly connected to the right side of the top of the reaction chamber 16. The flue gas is heated through the heating tube 18 to improve the reaction efficiency.

[0038] Two catalyst plates 19 are fixedly connected to the upper and lower sides of the interior of the reaction chamber 16, and catalyst 20 is fixedly connected to the middle of the reaction chamber 16. The reaction chamber 16 is the main place where flue gas and ammonia water react. At the bottom of the heating tube 18, two catalyst plates 19 are fixedly connected to the upper and lower sides of the interior of the reaction chamber 16, and catalyst 20 is fixedly connected to the middle.

[0039] A drive motor 21 is fixedly connected to the middle of the left side of the reaction chamber 16. A guide plate 22 is fixedly connected to the drive end of the drive motor 21. An L-shaped rod 23 is fixedly connected to the left side of the guide plate 22. The drive motor 21 drives the guide plate 22 and the L-shaped rod 23 to rotate. A fan 24 is fixedly connected to the left side of the L-shaped rod 23. The L-shaped rod 23 is tilted and fixed to the top of the fan 24.

[0040] A mounting bracket 25 is fixedly connected to the left side of the interior of the reaction chamber 16. The right side of the mounting bracket 25 is fixedly connected to the right side of the interior of the reaction chamber 16. The right side of the guide plate 22 is rotatably connected to the middle left side of the mounting bracket 25, enabling the guide plate 22 to rotate stably. Square rings 26 are rotatably connected to the upper and lower ends of the left side of the mounting bracket 25. The mounting bracket 25 is used to support and fix components such as the fan 24 and the guide plate 22. The outside of the fan 24 is rotatably connected to the inner wall of the square ring 26. Rotating shafts 27 are rotatably connected to the middle of the front and rear sides of the square ring 26. The adjacent sides of the two rotating shafts 27 are fixedly connected to the outside of the front and rear sides of the fan 24. The multi-angle blowing function of the fan 24 is realized by the rotation of the rotating shafts 27.

[0041] Working Principle: In operation, the drive motor 21 is first started, causing the guide plate 22 to rotate. The guide plate 22 is connected to the blower 24 via an L-shaped rod 23. When the guide plate 22 rotates, it drives the blower 24 to rotate as well. Since the blower 24 has rotating shafts 27 fixed at both ends, and these rotating shafts 27 are installed in the middle of the square ring 26, and the square ring 26 rotates in the middle of the fixed frame 25 via rotating rollers on the upper and lower sides, when the L-shaped rod 23 pulls the blower 24 to rotate, the blower 24 will rotate 360 ​​degrees within the square ring 26 under the drive of the rotating shafts 27. This design allows the blower 24 to blow air from multiple angles to the middle position inside the reaction chamber 16, effectively pushing away dust from the surfaces of the two catalyst plates 19 and 20, preventing dust residue from falling through gaps, and thus avoiding dust accumulation that could affect the activity of the catalyst plates.

[0042] Once no more dust is observed falling from the opening, the drive motor 21 can be turned off. Then, by rotating the worm gear 11, it meshes with the worm 12 fixed to the half-shell 9, causing the half-shell 9 to rotate at the top of the outlet pipe 8, adjusting the ammonia flow rate to prevent waste. After all settings are adjusted, flue gas is introduced. Since flue gas is less dense than air, it enters the interior of the duct 4 through the connecting pipe 2 and the through pipe 3. At this time, the booster pump 7 at the top of the storage tank 6 starts, drawing ammonia from the storage tank 6 through the outlet pipe 8 and delivering it to the spray plate 15 through the inlet pipe 13 and the water pipe 14. The ammonia sprayed from the nozzle of the spray plate 15 is sprayed upwards, encountering and reacting with the flue gas in the room. Simultaneously, the ammonia also cleans the surface of the duct. The cleaned ammonia flows along the inner wall of the duct 4 and the inner walls of the connecting pipe 2 and the through pipe 3, eventually flowing into the inlet pipe 1 and exiting from the opening at the bottom of the inlet pipe 1.

[0043] Meanwhile, the flue gas after reaction is filtered and flows into the reaction chamber 16 through the conduit 4. At this time, the heating motor 17 starts and heats the flue gas through the heating tube 18. After the heated flue gas passes through the catalyst plate 19 and the rotating shaft 27 for catalyst reaction, it successfully completes the denitrification process and is discharged from the bottom of the reaction chamber 16.

[0044] 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 cement kiln tail gas dust removal and ammonia control high-temperature denitration device, comprising an inlet pipe (1) and a liquid storage tank (6), characterized in that: The right side bottom end of the inlet pipe (1) is fixedly connected with a connecting pipe (2), the right side top end of the inlet pipe (1) is fixedly connected with a through pipe (3), the top end of the connecting pipe (2) is fixedly connected with a guide pipe (4), the inside left side of the guide pipe (4) is fixedly connected with two filter plates (5), the top end of the liquid storage tank (6) is fixedly connected with a booster water pump (7), the output end of the booster water pump (7) is fixedly connected with a liquid outlet pipe (8), the inside top end of the liquid outlet pipe (8) is rotatably connected with a half shell (9), the left side of the liquid outlet pipe (8) is fixedly connected with a protective cover (10), the middle part of the protective cover (10) is rotatably connected with a worm gear rod (11), the left side top end of the liquid outlet pipe (8) is rotatably connected with a worm (12), the top end of the liquid outlet pipe (8) is fixedly connected with a liquid inlet pipe (13), the top end of the liquid inlet pipe (13) is fixedly connected with a water pipe (14), the top end of the water pipe (14) is fixedly connected with a liquid spraying disc (15), the right side of the guide pipe (4) is fixedly connected with a reaction assembly.

2. The high-temperature denitration device for cleaning and controlling ammonia of cement kiln tail gas according to claim 1, characterized in that: The reaction assembly comprises a reaction box (16), the top end of the reaction box (16) is fixedly connected to the bottom right side of the guide pipe (4), the top right side of the reaction box (16) is fixedly connected with a heating motor (17), the left side of the heating motor (17) is fixedly connected with a heating pipe (18), the inside upper and lower sides of the reaction box (16) are fixedly connected with two catalyst plates I (19), the middle part of the reaction box (16) is fixedly connected with a catalyst II (20), the left middle part of the reaction box (16) is fixedly connected with a driving motor (21), the driving end of the driving motor (21) is fixedly connected with a guide disc (22), the left side of the guide disc (22) is fixedly connected with an L-shaped rod (23), the left side of the L-shaped rod (23) is fixedly connected with a fan (24), the inside left side of the reaction box (16) is fixedly connected with a fixing frame (25), the left side upper and lower ends of the fixing frame (25) are rotatably connected with square rings (26), the front and rear sides of the square rings (26) are rotatably connected with rotating shafts (27).

3. The high-temperature denitration device for cleaning and controlling ammonia of cement kiln tail gas according to claim 1, characterized in that: The left and right sides of the through pipe (3) are fixedly connected to the left bottom end of the guide pipe (4), the outside of the liquid spraying disc (15) is fixedly connected to the inside left side of the guide pipe (4).

4. The high-temperature denitration device for cleaning and controlling ammonia of cement kiln tail gas according to claim 1, characterized in that: The right end of the worm (12) is fixedly connected to the left end of the half shell (9), the outside of the worm gear rod (11) is meshingly connected with the outside of the worm (12).

5. The high-temperature denitration device for cleaning and controlling ammonia of cement kiln tail gas according to claim 2, characterized in that: The top end outside of the water pipe (14) is fixedly connected to the left end of the guide pipe (4), the outside of the heating pipe (18) is fixedly connected to the inside top end of the reaction box (16).

6. The high-temperature denitration device for cleaning and controlling ammonia of cement kiln tail gas according to claim 2, characterized in that: The right side of the fixing frame (25) is fixedly connected to the inside right side of the reaction box (16).

7. The high-temperature denitration device for cleaning and controlling ammonia of cement kiln tail gas according to claim 2, characterized in that: The proximal sides of the two rotating shafts (27) are fixedly connected to the front and rear sides outside of the fan (24).

8. The high-temperature denitration device for cleaning and controlling ammonia of cement kiln tail gas according to claim 2, characterized in that: The right side of the guide disc (22) is rotatably connected to the left middle part of the fixing frame (25), the outside of the fan (24) is rotatably connected to the inner wall of the square ring (26).

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