SNCR (selective non-catalytic reduction) denitration system
By using a flat mixing pipe and a multi-jet device in the SNCR system, combined with a cooling device, the problem of insufficient contact between ammonia and nitrogen oxides was solved, achieving a highly efficient denitrification effect, reducing costs and extending equipment life.
Patent Information
- Application Number
- CN202423230684.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-26
- Publication Date
- 2025-12-12
- Estimated Expiration
- 2034-12-26
AI Technical Summary
In existing SNCR technology, the contact and reaction between ammonia and nitrogen oxides are insufficient, resulting in low denitrification efficiency. Furthermore, traditional methods rely on catalysts, which can lead to problems such as poisoning and dust accumulation.
A flat mixing pipe and multiple jetting devices are used. The jetting devices are evenly distributed on both sides and along the length of the mixing pipe, and multiple jetting holes are provided inside. Combined with a cooling device, the jetting pipe is cooled to ensure that ammonia and flue gas are fully mixed and react at high temperature.
It improves the contact and reaction efficiency between ammonia and nitrogen oxides, resulting in higher denitrification efficiency, avoids the use of catalysts, reduces costs, and can work continuously for a long time.
Smart Images
Figure CN223654743U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of denitrification, and more specifically, to an SNCR denitrification system. Background Technology
[0002] Flue gas denitrification refers to the process of removing nitrogen oxides (NOx) generated during chemical production. X A common method for flue gas denitrification is selective catalytic reduction (SCR) technology, which involves injecting ammonia, a reducing agent, into flue gas at 280℃~450℃ and mixing it evenly. Under the action of a catalyst, ammonia (NH3) reduces nitrogen oxides (NOx) in the flue gas into nitrogen and water, thereby achieving the purpose of removing NOx from the mixed gas. However, traditional catalyst methods suffer from problems such as catalyst poisoning, dust accumulation, and sulfate production.
[0003] Therefore, there is also SNCR technology, or non-catalytic reduction technology. In the absence of a catalyst, ammonia gas is injected into the inlet of the transition section of a primary converter at an appropriate location, reducing NOx to harmless nitrogen and water within a temperature range of 850-1100℃. This eliminates catalyst-related issues. However, this technology relies heavily on the contact reaction between ammonia and flue gas. Conventional flue gas exhaust channels have large cross-sectional areas, which may lead to insufficient contact and reaction between ammonia and nitrogen oxides, thus affecting denitrification efficiency. Utility Model Content
[0004] The purpose of this invention is to provide an SNCR denitrification system that can effectively improve the contact and reaction efficiency between ammonia and nitrogen oxides in the mixing tube, thereby fully achieving denitrification.
[0005] This utility model is achieved through the following technical solution: The SNCR denitrification system of this utility model includes a mixing pipe and multiple jet devices connected to the mixing pipe; the mixing pipe has a flat structure and both ends are connected to the flue; the jet device includes a jet pipe connected to the mixing pipe and an ammonia source connected to the jet pipe; the jet pipe is connected to a cooling device.
[0006] Furthermore, multiple jet devices are evenly distributed on both sides of the mixing pipe.
[0007] Furthermore, the plurality of jet devices are evenly distributed along the length of the mixing tube.
[0008] Furthermore, the jet pipe portion is located inside the mixing pipe.
[0009] Furthermore, the jet pipe is provided with a plurality of first jet holes at one end of the jet pipe located inside the mixing pipe.
[0010] Furthermore, the jet pipe has a plurality of second jet holes on one end sidewall inside the mixing pipe.
[0011] Furthermore, the cooling device includes a cooling jacket fitted over the jet pipe, an intake pipe and an exhaust pipe connected to the cooling jacket, and a nitrogen source connected to the intake pipe; the cooling jacket is partially located inside the mixing pipe.
[0012] Furthermore, the cooling device also includes a partition plate disposed between the cooling jacket and the jet pipe; the intake pipe and the exhaust pipe are both connected to the end of the cooling jacket disposed outside the mixing pipe; the partition plate is fixedly connected to the end of the cooling jacket disposed outside the mixing pipe, and a gap is provided between the partition plate and the end of the cooling jacket disposed inside the mixing pipe; the intake pipe and the exhaust pipe are respectively disposed on both sides of the partition plate.
[0013] The technical solution of this utility model has at least the following advantages and beneficial effects: The SNCR denitrification system of this utility model introduces the flue gas in the flue into the mixing pipe so that it mixes and reacts with the ammonia gas sprayed by the jet device before returning to the flue. The use of a flat mixing pipe in conjunction with multiple jet devices can effectively react the sprayed ammonia gas with the nitrogen oxides in the flue gas, reducing it to nitrogen gas before it is discharged (the denitrification process). This eliminates the need for catalysts and additional equipment, allowing for better cost control and higher denitrification efficiency. Since the entire process is carried out at high temperatures, a cooling device is required to cool the jet pipe, enabling it to operate continuously for a long time. Attached Figure Description
[0014] Figure 1 A schematic diagram of the SNCR denitrification system provided in this embodiment of the utility model;
[0015] Figure 2 This is a schematic diagram of the structure of the mixing tube portion provided in an embodiment of the present utility model;
[0016] Figure 3 A schematic diagram of the internal structure of the jet pipe provided in an embodiment of this utility model;
[0017] Figure 4 This is a two-view structural diagram of the interior of the jet pipe provided in an embodiment of the present invention.
[0018] Icons: 11-Ammonia source, 12-Nitrogen source, 13-Flue, 14-Mixing pipe, 20-Jet device, 21-Jet pipe, 22-First jet hole, 23-Second jet hole, 31-Cooling jacket, 32-Inlet pipe, 33-Exhaust pipe, 34-Baffle. Detailed Implementation
[0019] Example
[0020] The following description, in conjunction with specific embodiments, further illustrates the point, as shown in the appendix. Figure 1 -Appendix Figure 4 As shown, the SNCR denitrification system of this embodiment includes a mixing pipe 14 and multiple jet devices 20 connected to the mixing pipe 14. The mixing pipe 14 has a flat structure and both ends are connected to the flue 13. The jet device 20 includes a jet pipe 21 connected to the mixing pipe 14 and an ammonia source 11 connected to the jet pipe 21. The jet pipe 21 is connected to a cooling device. Specifically, the flue gas in the flue 13 is introduced into the mixing pipe 14 to mix and react with the ammonia gas sprayed by the jet device 20, and then returned to the flue 13. The use of the flat mixing pipe 14 in conjunction with multiple jet devices 20 can effectively react the sprayed ammonia gas with the nitrogen oxides in the flue gas, reducing it to nitrogen gas before discharge (the denitrification process). This eliminates the need for catalysts and additional equipment, better controls costs, and achieves higher denitrification efficiency. Since the entire process is carried out at high temperatures, a cooling device is required to cool the jet pipe 21 to enable it to operate continuously for extended periods.
[0021] In this embodiment, multiple jetting devices 20 are evenly distributed on both sides of the mixing pipe 14. The multiple jetting devices 20 are evenly distributed along the length of the mixing pipe 14. Specifically, this allows ammonia gas to be injected more fully into the mixing pipe 14, and to more fully contact and react with the nitrogen oxides in the mixing tank.
[0022] In this embodiment, the jet pipe 21 is partially located inside the mixing pipe 14. Specifically, this allows ammonia gas to be better injected into the interior of the mixing pipe 14 and to be fully and evenly dispersed within the mixing pipe 14.
[0023] In this embodiment, the jet pipe 21, located within the mixing pipe 14, has multiple first jet holes 22 at one end. The side wall of the jet pipe 21 within the mixing pipe 14 also has multiple second jet holes 23. Specifically, the multiple first jet holes 22 and multiple second jet holes 23 are provided to ensure that ammonia gas can be more fully and quickly dispersed within the mixing pipe 14.
[0024] The cooling device in this embodiment includes a cooling jacket 31 fitted over the jet pipe 21, an inlet pipe 32 and an exhaust pipe 33 connected to the cooling jacket 31, and a nitrogen source 12 connected to the inlet pipe 32; the cooling jacket 31 is partially located inside the mixing pipe 14. Specifically, the nitrogen source 12 delivers low-temperature (or room-temperature) nitrogen gas into the cooling jacket 31 through the inlet pipe 32 to cool the jet pipe 21 before discharging it through the exhaust pipe 33. The nitrogen gas discharged through the exhaust pipe 33 can be collected and fully utilized.
[0025] The cooling device in this embodiment also includes a partition 34 disposed between the cooling jacket 31 and the jet pipe 21; the intake pipe 32 and the exhaust pipe 33 are both connected to the end of the cooling jacket 31 located outside the mixing pipe 14; the partition 34 is fixedly connected to the end of the cooling jacket 31 located outside the mixing pipe 14, and a gap is provided between the partition 34 and the end of the cooling jacket 31 located inside the mixing pipe 14; the intake pipe 32 and the exhaust pipe 33 are respectively disposed on both sides of the partition 34. Specifically, as shown in the attached figure... Figure 3 and attached Figure 4 As shown, by setting the baffle 34, nitrogen gas can pass fully over the surface of the jet pipe 21, thereby effectively cooling the jet pipe 21.
[0026] In summary, the SNCR denitrification system of this embodiment introduces the flue gas in the flue 13 into the mixing pipe 14 so that it mixes and reacts with the ammonia gas sprayed by the jet device 20 before returning to the flue 13. The use of the flat mixing pipe 14 in conjunction with multiple jet devices 20 can effectively react the sprayed ammonia gas with the nitrogen oxides in the flue gas, reducing it to nitrogen gas before discharge (the denitrification process). This eliminates the need for catalysts and additional equipment, allowing for better cost control and higher denitrification efficiency. Since the entire process is carried out at high temperatures, a cooling device is required to cool the jet pipe 21 to enable it to operate continuously for extended periods.
[0027] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. An SNCR denitrification system, characterized in that: It includes a mixing tube (14) and a plurality of jet devices (20) connected to the mixing tube (14); The mixing pipe (14) has a flat structure and both ends are connected to the flue (13); the jetting device (20) includes a jetting pipe (21) connected to the mixing pipe (14) and an ammonia source (11) connected to the jetting pipe (21); the jetting pipe (21) is connected to a cooling device.
2. The SNCR denitrification system according to claim 1, characterized in that: Multiple jet devices (20) are evenly distributed on both sides of the mixing pipe (14).
3. The SNCR denitrification system according to claim 2, characterized in that: Multiple jet devices (20) are evenly distributed along the length of the mixing tube (14).
4. The SNCR denitrification system according to claim 1, characterized in that: The jet pipe (21) is partially located inside the mixing pipe (14).
5. The SNCR denitrification system according to claim 4, characterized in that: The jet pipe (21) is located inside the mixing pipe (14) and has a plurality of first jet holes (22) at one end.
6. The SNCR denitrification system according to claim 5, characterized in that: The jet pipe (21) is located inside the mixing pipe (14) and has a plurality of second jet holes (23) on one end side wall.
7. The SNCR denitrification system according to claim 1, characterized in that: The cooling device includes a cooling sleeve (31) fitted over the jet pipe (21), an intake pipe (32) and an exhaust pipe (33) connected to the cooling sleeve (31), and a nitrogen source (12) connected to the intake pipe (32); the cooling sleeve (31) is partially located inside the mixing pipe (14).
8. The SNCR denitrification system according to claim 7, characterized in that: The cooling device also includes a partition (34) disposed between the cooling jacket (31) and the jet pipe (21); The intake pipe (32) and the exhaust pipe (33) are both connected to the end of the cooling jacket (31) located outside the mixing pipe (14); The partition (34) is fixedly connected to the cooling sleeve (31) at one end outside the mixing pipe (14), and a gap is provided between the partition (34) and the cooling sleeve (31) at one end inside the mixing pipe (14); the air inlet pipe (32) and the exhaust pipe (33) are respectively located on both sides of the partition (34).