Atomizing lance for a denitration process

Abstract

The utility model discloses a kind of atomization spray guns for denitration process, including solution pipe, gas inlet, outlet ring and air jet head. Solution pipe outer sleeve flange, import main body pipe, outlet screw sprayer nozzle;Gas inlet is located in main body pipe side, liquid inlet is located in flange side, main body pipe is inserted with the gas tube coaxial with solution pipe;Outlet ring screw sprayer nozzle and insert protection piece, sprayer nozzle inner wall is equipped with thread groove, coating wear-resistant layer, outlet edge is equipped with fillet chamfer;Air jet head is equipped in gas pipe outlet, circumferentially first air jet hole is equipped, side second air jet hole is equipped. The atomization spray gun for denitration process, by thread groove and oblique stirring, forward boost double-layer air jet, make gas-liquid mixing path from straight line into spiral plus bidirectional impact, improve atomization particle uniformity and reducing agent coverage, avoid jam;Wear-resistant layer, fillet chamfer and outlet ring that can be replaced alone, improve sprayer nozzle wear resistance, reduce spare part cost and maintenance difficulty.

Description

Technical Field

[0001] This utility model relates to the field of industrial flue gas treatment applications, and in particular to an atomizing spray gun for denitrification processes. Background Technology

[0002] In industrial denitrification processes, SNCR technology is widely used due to its low cost and ease of modification. Its core is to uniformly spray a reducing agent (such as urea solution) into the furnace reaction zone using an atomizing spray gun.

[0003] Common spray gun nozzles have two major problems: First, the gas-liquid mixing path is simple, mostly a single method of "airflow directly hitting liquid", resulting in uneven atomized particles and insufficient contact between reducing agent and nitrogen oxides; second, the inner wall of the spray gun nozzle is in direct contact with high-speed gas-liquid mixture and high-temperature dust, which is prone to erosion and wear, with an average service life of only 3-6 months, requiring frequent shutdowns for replacement, increasing the company's operation and maintenance costs, and failing to meet the working requirements of industrial flue gas treatment applications. Therefore, an atomizing spray gun for denitrification process is proposed. Utility Model Content

[0004] This utility model provides the following technical solution: an atomizing spray gun for denitrification processes, comprising: The solution pipe has a flange on its exterior, a main pipe installed at its inlet, and a spray nozzle screwed onto its outlet. The flange on the outside of the solution pipe ensures a stable connection between the atomizing spray gun and the furnace or denitrification system pipeline, preventing loosening due to vibration during long-term operation and ensuring stable gas-liquid transport. The main pipe at the inlet provides a stable support for the insertion of the gas pipe and the assembly of the air inlet, ensuring the coaxiality of the gas pipe and solution pipe and preventing structural misalignment from affecting the gas-liquid mixing effect. The spray nozzle is screwed onto the outlet of the solution pipe. An air inlet is installed on the outer side of the main tube. A liquid inlet is installed on the outer side of the solution tube, located on the flange side. An air pipe is inserted inside the main tube. The air inlet's location on the outer side of the main tube allows for convenient access to compressed air, and its integrated design with the main tube reduces the complexity of external piping and lowers the risk of leakage. The liquid inlet, located on the flange side, ensures convenient connection to external reducing agent delivery pipelines while leveraging the flange's support to enhance its load-bearing capacity and prevent breakage due to long-term stress. The air pipe inserted inside the main tube forms a coaxial nested structure with the solution tube, ensuring that compressed air and reducing agent enter the mixing area from the same axial direction during subsequent mixing. This lays the structural foundation for uniform gas-liquid mixing and prevents uneven mixing caused by deviations in the gas-liquid delivery direction. An outlet ring is screwed onto the outside of the spray nozzle. The inner wall of the spray nozzle has threaded grooves and is coated with a wear-resistant layer. The outlet edge of the spray nozzle has a rounded chamfer. The air outlet of the air pipe penetrates the inside of the spray nozzle. The threaded grooves on the inner wall of the spray nozzle guide the gas-liquid mixture along a spiral path, prolonging the gas-liquid contact time and breaking the limitations of the traditional straight mixing path, resulting in more thorough gas-liquid mixing and improved uniformity of atomized particles. The wear-resistant coating on the inner wall enhances the spray nozzle's resistance to high-speed gas-liquid mixtures and high-temperature dust. The nozzle has excellent resistance to erosion and wear, extending its service life. The rounded chamfer at the outlet edge prevents excessive erosion of the gas-liquid mixture due to localized stress concentration at the outlet, preventing wear and deformation at the outlet edge, ensuring dimensional stability of the atomization outlet, and maintaining consistent atomization performance over the long term. The air outlet of the air pipe penetrates the inside of the nozzle, allowing compressed air to be directly delivered to the mixing area inside the nozzle. This ensures efficient mixing of compressed air and reducing agent within the nozzle, preventing leakage or pressure loss during compressed air delivery and guaranteeing sufficient power for gas-liquid mixing. A jet head, installed at the outlet of the air pipe, has a first jet hole circumferentially mounted on its outer side and a second jet hole on its outer side. A protective component is inserted inside the outlet ring. The jet head, installed at the air pipe outlet, provides a mounting carrier for the first and second jet holes, allowing compressed air to be precisely ejected through specific orifices, achieving directional airflow control. The first jet hole circumferentially mounted on the outer side of the jet head allows compressed air to be ejected obliquely circumferentially, creating a stirring effect on the reducing agent inside the nozzle, breaking the traditional single-flow direct mixing method and promoting initial gas-liquid mixing. The second jet hole on the outer side... The ejected forward airflow propels the initially mixed gas-liquid mixture, accelerating its flow towards the nozzle outlet. Simultaneously, it further enhances gas-liquid turbulence, achieving secondary mixing. Through a dual-layer jet pattern of oblique stirring and forward propulsion, the uniformity of gas-liquid mixing is significantly improved. A protective component is inserted inside the outlet ring, providing dual protection for both the internal structure of the outlet ring and the nozzle outlet area. This prevents high-temperature dust from entering the gap between the outlet ring and the nozzle, avoiding dust accumulation and blockage. The protective component also withstands some of the erosion from the gas-liquid mixture, reducing wear on the outlet ring and nozzle and extending the overall structural lifespan.

[0005] Preferably, the trachea penetrates the interior of the solution tube, the inner cavity of the air inlet is connected to the inner cavity of the trachea, and the inner cavity of the liquid inlet is connected to the interior of the solution tube.

[0006] Preferably, the diameter of the gas tube is smaller than the diameter of the solution tube, and the wear-resistant layer is a ceramic coating.

[0007] Preferably, the number of the first jet holes is 4-6 sets, all of which are inclined and the inclination angle of the first jet hole is set at 30° with the axis of the air pipe. The second jet hole is horizontal and the number of the second jet holes is 3-5 sets.

[0008] Preferably, the outlets of the first jet holes are all oriented towards the threaded groove, and the outlets of the second jet holes are all oriented towards the outlet ring.

[0009] Preferably, the protective component has an L-shaped cross-section, with its short side connected to the inner wall of the outlet ring, its long side inserted into the inner outlet of the spray nozzle, and a guide surface provided on the inner side of the long side of the protective component, the guide surface being inclined.

[0010] In summary, compared with the prior art, this utility model provides an atomizing spray gun for denitrification processes, which has the following beneficial effects: This atomizing spray gun for denitrification processes, through the threaded grooves on the inner wall of the nozzle and the jet head added to the air outlet, can form a dual-layer jet mode combining oblique stirring and forward propulsion through the first and second jet holes. Furthermore, the threaded grooves change the gas-liquid mixing path from a straight line to a spiral and bidirectional impact, improving the uniformity of the atomized particles and increasing the coverage of the reducing agent. This also prevents the spray gun from getting clogged. The outlet ring screwed onto the outside of the nozzle, along with the wear-resistant layer and rounded chamfer design, enhances the nozzle's wear resistance, preventing excessive scouring of the nozzle by the gas-liquid mixture. When the protective components inside the outlet ring wear excessively, only the outlet ring needs to be replaced, without replacing the entire nozzle, thus improving the ease of use of the atomizing spray gun. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model.

[0012] Figure 2 This is a schematic diagram of the main tube structure of this utility model.

[0013] Figure 3 This is a schematic diagram of the longitudinal cross-sectional structure of the main tube of this utility model.

[0014] Figure 4 This is a schematic diagram of the transverse structure of the main tube of this utility model.

[0015] Figure 5 This is a cross-sectional structural diagram of the solution tube and spray nozzle of this utility model.

[0016] Figure 6 This is a schematic diagram of the cross-sectional structure of the outlet ring of this utility model.

[0017] Explanation of reference numerals in the attached figures: 1. Solution pipe; 2. Flange; 3. Main pipe; 4. Spray nozzle; 5. Air inlet; 6. Liquid inlet; 7. Air pipe; 8. Outlet ring; 9. Jet head; 10. Threaded groove; 11. Wear-resistant layer; 12. First jet hole; 13. Second jet hole; 14. Rounded chamfer; 15. Protective component; 16. Guide surface. Detailed Implementation

[0018] This utility model provides a technical solution: an atomizing spray gun for denitrification processes, comprising a solution pipe 1, a flange 2, a main body pipe 3, a spray nozzle 4, an air inlet 5, a liquid inlet 6, an air pipe 7, an outlet ring 8, a jet head 9, a threaded groove 10, a wear-resistant layer 11, a first jet hole 12, a second jet hole 13, a rounded chamfer 14, a protective component 15, and a guide surface 16. Please see Figure 1 The solution tube 1 is fitted with a flange 2. Please refer to [link / reference]. Figure 2 The main body tube 3 is installed at the inlet of solution tube 1. Please refer to [link / reference]. Figure 1 A spray nozzle 4 is screwed onto the external outlet of the solution tube 1; Please see Figure 2 The air inlet 5 is installed on the outside of the main body pipe 3. The liquid inlet 6 is installed on the outside of the solution pipe 1, located on the side of the flange 2. Please refer to [link / reference]. Figure 3 An air tube 7 is inserted inside the main tube 3; Please see Figure 5 The outlet ring 8 is screwed onto the outside of the spray nozzle 4. The inner wall of the spray nozzle 4 is provided with a threaded groove 10. The inner wall of the spray nozzle 4 is coated with a wear-resistant layer 11. The outlet edge of the spray nozzle 4 is provided with a rounded chamfer 14. The air outlet of the air pipe 7 passes through the inside of the spray nozzle 4. The jet head 9 is installed at the outlet of the air pipe 7. A first jet hole 12 is provided circumferentially on the outer side of the jet head 9, and a second jet hole 13 is provided on the outer side of the jet head 9. (See also...) Figure 6 A protective component 15 is inserted inside the outlet ring 8. The protective component 15 has an L-shaped cross-section. The short side of the protective component 15 is connected to the inner wall of the outlet ring 8. The long side of the protective component 15 is inserted into the inner outlet of the spray nozzle 4. A guide surface 16 is provided on the inner side of the long side of the protective component 15. The guide surface 16 is inclined. By using the threaded groove 10 on the inner wall of the nozzle 4 and the jet head 9 added to the outlet of the air pipe 7, a dual-layer jet mode combining oblique stirring and positive boosting can be formed through the first jet hole 12 and the second jet hole 13. In addition, the threaded groove 10 can change the gas-liquid mixing path from a straight line to a spiral and bidirectional impact, which improves the uniformity of the atomized particles of the nozzle and increases the coverage of the reducing agent. At the same time, it avoids the problem of nozzle clogging. Furthermore, the design of the outlet ring 8 screwed on the outside of the nozzle 4 and the wear-resistant layer 11 and the rounded chamfer 14 improves the wear resistance of the nozzle 4 and avoids excessive scouring of the nozzle 4 by the gas-liquid mixture. When the protective part 15 inside the outlet ring 8 is worn excessively, only the outlet ring 8 needs to be replaced, without replacing the entire nozzle, which improves the ease of use of the atomizing spray gun. Please see Figure 3 and Figure 4 The trachea 7 penetrates the interior of the solution tube 1. The inner cavity of the air inlet 5 is connected to the inner cavity of the trachea 7, and the inner cavity of the liquid inlet 6 is connected to the interior of the solution tube 1. The diameter of the trachea 7 is smaller than the diameter of the solution tube 1. Please refer to [link / reference]. Figure 5 The wear-resistant layer 11 is a ceramic coating, the depth of the thread groove 10 is 0.8-1mm, and the pitch of the thread groove 10 is 3-5mm. The number of first jet holes 12 is 4-6 sets, and all first jet holes 12 are inclined. The inclination angle of the first jet hole 12 is set at a 30° angle with the axis of the air pipe 7. The number of second jet holes 13 is 3-5 sets, and the outlet of the first jet hole 12 is facing the threaded groove 10. The outlet of the second jet hole 13 is facing the outlet ring 8. The chamfer radius of the arc chamfer 14 is 0.5-1mm.

[0019] This design, through the threaded groove 10 on the inner wall of the nozzle 4 and the jet head 9 added to the outlet of the air pipe 7, can form a dual-layer jet mode combining oblique stirring and forward propulsion through the first jet hole 12 and the second jet hole 13. In addition, the threaded groove 10 can change the gas-liquid mixing path from a straight line to a spiral and bidirectional impact, which improves the uniformity of the atomized particles of the nozzle and increases the coverage of the reducing agent. At the same time, it avoids the problem of nozzle clogging. Furthermore, the design of the outlet ring 8 screwed on the outside of the nozzle 4 and the wear-resistant layer 11 and the rounded chamfer 14 improves the wear resistance of the nozzle 4, avoiding excessive scouring of the nozzle 4 by the gas-liquid mixture. When the protective part 15 inside the outlet ring 8 is worn excessively, only the outlet ring 8 needs to be replaced, without replacing the entire nozzle, which improves the ease of use of the atomizing spray gun.

Claims

1. An atomizing spray gun for denitrification processes, characterized in that, include: Solution tube (1), a flange (2) is fitted on the outside of the solution tube (1), a main tube (3) is installed at the inlet of the solution tube (1), and a spray nozzle (4) is screwed on at the outlet of the solution tube (1). An air inlet (5) is installed on the outside of the main tube (3). An inlet (6) is installed on the outside of the solution tube (1) at the side of the flange (2). An air tube (7) is inserted inside the main tube (3). The outlet ring (8) is screwed onto the outside of the spray nozzle (4). The inner wall of the spray nozzle (4) is provided with a threaded groove (10). The inner wall of the spray nozzle (4) is coated with a wear-resistant layer (11). The outlet edge of the spray nozzle (4) is provided with a rounded chamfer (14). The air outlet of the air pipe (7) penetrates the interior of the spray nozzle (4). A jet head (9) is installed at the outlet of the air pipe (7). A first jet hole (12) is installed on the outer circumference of the jet head (9), and a second jet hole (13) is provided on the outer side of the jet head (9). A protective member (15) is inserted inside the outlet ring (8).

2. The atomizing spray gun for denitrification process according to claim 1, characterized in that: The air tube (7) penetrates the interior of the solution tube (1), the inner cavity of the air inlet (5) is connected to the inner cavity of the air tube (7), and the inner cavity of the liquid inlet (6) is connected to the interior of the solution tube (1).

3. The atomizing spray gun for denitrification process according to claim 1, characterized in that: The diameter of the air tube (7) is smaller than the diameter of the solution tube (1), the wear-resistant layer (11) is a ceramic coating, the depth of the threaded groove (10) is 0.8-1mm, and the pitch of the threaded groove (10) is 3-5mm.

4. The atomizing spray gun for denitrification process according to claim 1, characterized in that: The number of the first jet holes (12) is 4-6 sets. The first jet holes (12) are all inclined. The inclination angle of the first jet holes (12) is set at a 30° angle with the axis of the air pipe (7). The second jet holes (13) are horizontally set. The number of the second jet holes (13) is 3-5 sets.

5. An atomizing spray gun for denitrification process according to claim 4, characterized in that: The outlet of the first jet hole (12) is facing the threaded groove (10), and the outlet of the second jet hole (13) is facing the outlet ring (8). The chamfer radius of the arc chamfer (14) is 0.5-1mm.

6. The atomizing spray gun for denitrification process according to claim 1, characterized in that: The protective component (15) has an L-shaped cross section. The short side of the protective component (15) is connected to the inner wall of the outlet ring (8). The long side of the protective component (15) is inserted into the inner outlet of the spray nozzle (4). A guide surface (16) is provided on the inner side of the long side of the protective component (15). The guide surface (16) is inclined.

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