Anti-blocking ammonia-air mixer

Abstract

The utility model discloses an anti-blocking ammonia-air mixer, which belongs to the technical field of gas mixing and comprises a shell, an air inlet is arranged at one end of the shell, an ammonia inlet is arranged on the side wall of the shell, and a mixed gas outlet is arranged at the other end of the shell; the turbulent flow part is obliquely arranged in the shell in the direction close to the mixed gas outlet, the turbulent flow part comprises a first turbulent flow part and a second turbulent flow part, the first turbulent flow part and the second turbulent flow part are distributed on the inner wall of the shell in a staggered sorting mode in the air flowing direction, the first turbulent flow part is connected with a first position of the inner wall of the shell, and the second turbulent flow part is connected with a second position of the inner wall of the shell. The second turbulent flow part is connected with a second position of the inner wall of the shell, and the first position and the second position are located on the two opposite sides of the inner wall of the shell correspondingly. The problem that the outlet of the ammonia spraying branch pipe is blocked due to the fact that moisture in ammonia stays in the pipeline for a long time, is condensed into water and is bonded and deposited with dust in the air is solved, the turbulent flow part plays a certain role in guiding flow, the turbulent flow strength is increased, and the mixing effect of the ammonia and the air is improved.

Description

Technical Field

[0001] This utility model belongs to the field of gas mixing technology and relates to an anti-clogging ammonia-air mixer. Background Technology

[0002] Selective Catalytic Reduction (SCR) technology is a widely adopted and highly efficient denitrification method, boasting advantages such as mature technology and high denitrification efficiency (up to 85% or more). Its working principle involves using ammonia (NH3) as a reducing agent under the action of a catalyst to convert nitrogen oxides into harmless nitrogen gas and water vapor. To ensure the safety of the SCR denitrification process, an ammonia-air mixer is required to dilute the ammonia gas to below its explosion limit. According to the standard DL / T5480 "Technical Specification for Flue Gas Denitrification Design of Thermal Power Plants," the ammonia concentration at the outlet of the ammonia-air mixer must not exceed 5% (volume fraction). Whether ammonia and air can be mixed evenly is a crucial factor affecting the SCR denitrification efficiency. Uneven mixing of ammonia and air will severely impact the removal efficiency of nitrogen oxides and may also cause excessive ammonia escape.

[0003] Traditional ammonia-air mixers come in many varieties, but they suffer from problems such as complex structure, difficult maintenance, and low mixing efficiency. In addition, to increase the diffusion effect of ammonia, most ammonia supply pipelines consist of a main pipe and multiple branch pipes. Moisture in the ammonia will condense into water if it stays in the pipeline for a long time. This water will adhere to and deposit with dust in the air, causing blockage at the outlet of the ammonia injection branch pipe. At the same time, the ammonia decelerates as it enters the branch pipe from the main pipe, which will also exacerbate the blockage.

[0004] Therefore, it is necessary to provide a simple, anti-clogging ammonia-air mixer. Utility Model Content

[0005] To at least address the problem of easy clogging in traditional ammonia-air mixers in the prior art, this utility model provides the following technical solution: an anti-clogging ammonia-air mixer, the ammonia-air mixer comprising:

[0006] A housing, one end of which is an air inlet, and an ammonia inlet is provided on the side wall of the housing; the other end of the housing is a mixed gas outlet; and

[0007] A flow-dispersing section is provided within the housing at an angle toward the outlet of the mixed gas. The flow-dispersing section includes a first flow-dispersing section and a second flow-dispersing section. Along the airflow direction, the first flow-dispersing section and the second flow-dispersing section are alternately arranged on the inner wall of the housing. The first flow-dispersing section is connected to a first position on the inner wall of the housing, and the second flow-dispersing section is connected to a second position on the inner wall of the housing. The first position and the second position are respectively located on opposite sides of the inner wall of the housing.

[0008] Optionally, in the above-described anti-clogging ammonia-air mixer, the ammonia inlet is opposite to the first or second turbulence section located on the other side of the housing near the air inlet.

[0009] Optionally, in the above-mentioned anti-clogging ammonia-air mixer, the turbulence-disrupting part is a semi-circular plate, the turbulence-disrupting part has a free end and a connecting end, the connecting end is arc-shaped and its bottom is connected to the inner wall of the shell, and the free end is planar and its length is equal to the diameter of the cylindrical shell.

[0010] Optionally, in the above-mentioned anti-clogging ammonia-air mixer, the free end of the turbulence section is 2-4 cm away from the centerline of the housing.

[0011] Optionally, in the above-mentioned anti-clogging ammonia-air mixer, the included angle α between the turbulence section and the axis of the housing is 45° to 60°.

[0012] Optionally, in the above-described anti-clogging ammonia-air mixer, a plurality of second or first turbulence sections located on the same side as the ammonia inlet are spaced apart on the inner wall of the housing between the ammonia inlet and the mixed gas outlet.

[0013] Multiple first or second turbulence sections, located on different sides from the ammonia inlet, are spaced apart on the wall inside the housing between the air inlet and the mixed gas outlet.

[0014] Optionally, in the aforementioned anti-clogging ammonia-air mixer, a first electrically operated regulating valve is installed on the air supply pipe connected to the air inlet for automatically regulating the air flow; and

[0015] A second electric regulating valve is installed on the ammonia supply pipeline connected to the ammonia inlet for automatically regulating the ammonia flow rate.

[0016] Optionally, in the above-mentioned anti-clogging ammonia-air mixer, the concentration of the air-ammonia mixture flowing out of the mixed gas outlet does not exceed 5%.

[0017] Optionally, in the above-mentioned anti-clogging ammonia-air mixer, the ammonia supply pipe is arranged perpendicular to the shell, and the ammonia supply pipe is connected to the shell through a flange;

[0018] The air supply duct is connected to the housing via a flange.

[0019] Optionally, in the above-mentioned anti-clogging ammonia-air mixer, an inspection port is provided on the housing for cleaning and maintenance.

[0020] The beneficial effects of the technical solution provided by this utility model embodiment are:

[0021] The flow-deflecting section of this application is inclined and positioned within the casing towards the outlet of the mixed gas. This flow-deflecting section serves a guiding function. Furthermore, by arranging the first and second flow-deflecting sections alternately on opposite sides of the inner wall of the casing along the airflow direction, this application increases the flow-deflecting force and enhances the mixing effect of ammonia and air (or, in other words, the dilution effect of ammonia). This ammonia-air mixer only has one ammonia inlet on the casing, or in other words, only an ammonia supply pipe as the main ammonia injection pipe, without any branch ammonia injection pipes. There is no turning or deceleration; the ammonia directly enters the casing to mix with the air, avoiding the problem of moisture in the ammonia condensing into water and adhering to dust in the air, causing blockage of the ammonia injection branch pipe outlet. Attached Figure Description

[0022] Figure 1 A schematic axial cross-sectional view of an anti-clogging ammonia-air mixer provided in this embodiment of the present invention;

[0023] Figure 2 A schematic diagram of the structure of an anti-clogging ammonia-air mixer provided in an embodiment of this utility model;

[0024] In the diagram: 1. Air inlet; 2. Inspection port; 3. Shell; 4. Mixed gas outlet; 5. Ammonia inlet; 6. Baffle section; 601. First baffle section; 602. Second baffle section; a is the angle between the baffle and the axis (or side wall) of the shell. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0026] In the description of this utility model, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and do not require that this utility model be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model. The terms "connected," "linked," and "set up" used in this utility model should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a direct connection or an indirect connection through intermediate components; a wired connection, a radio connection, or a wireless communication signal connection. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0027] Please see Figure 1-2This utility model provides the following technical solution: an anti-clogging ammonia-air mixer, comprising: a housing 3 and a flow-disrupting part 6. One end of the housing 3 is an air inlet 1, which is connected to an air supply pipe (not shown in the figure) for conveying air. An ammonia inlet 501 is provided on the side wall of the housing 3, which is connected to an ammonia supply pipe (not shown in the figure) for conveying ammonia. The ammonia supply pipe (which can also be the ammonia inlet 5) is perpendicular to the housing 3. It is understood that, to facilitate the mixing of ammonia and air, the ammonia inlet 5 should not be too far from the air inlet 1 under normal circumstances; the specific distance can be flexibly set according to the actual needs of the site. The other end of the housing 3 is a mixed gas outlet 4, which is connected to equipment requiring ammonia-air mixing (not shown in the figure). To facilitate gas flow, the air inlet 1 and the mixed gas outlet 4 are located on the same straight line (referring to the axis of the housing 3). The flow-deflecting section 6 is inclined and disposed within the housing 3 towards the direction of the mixed gas outlet 4. The angle α between the flow-deflecting section 6 and the axis (or sidewall) of the housing 3 is 45° to 60°, for example: 45°, 46°, 48°, 50°, 52°, 54°, 55°, 58°, 60°, or other values. In this way, the flow-deflecting section 6 can play a certain guiding role. The flow-deflecting section 6 includes: a first flow-deflecting section 601 and a second flow-deflecting section 602. Along the airflow direction, the first flow-deflecting section 601 and the second flow-deflecting section 602 are alternately arranged on the inner wall of the housing 3. Specifically, the first flow-deflecting section 601 is connected to a first position on the inner wall of the housing 3, and the second flow-deflecting section 602 is connected to a second position on the inner wall of the housing 3. The first position and the second position are respectively located on opposite sides of the inner wall of the housing 3. This can increase the turbulence force and improve the mixing effect of ammonia and air, or in other words, dilute the ammonia. It should be noted that the first spoiler 601 and the second spoiler 602 have the same structure, differing only in their position on the inner wall of the housing 3. For ease of description, the prefixes "first" and "second" are added before the spoiler to distinguish them. Figure 1In the diagram, air enters the housing 3 through air inlet 1, and ammonia gas is supplied into the housing 3 via an ammonia supply pipe. The air flows from left to right along the axis of the housing 3, while ammonia gas enters downwards through ammonia inlet 5 and mixes with the air. A flow-deflecting section 6 obstructs the mixture, ensuring thorough mixing of ammonia and air. Simultaneously, the first flow-deflecting section 601 and the second flow-deflecting section 602 are alternately arranged on the inner walls of both sides of the housing 3, increasing the flow intensity and improving the mixing effect of ammonia and air. The mixed gas, guided by the flow-deflecting section 6, quickly flows out from the mixed gas outlet 4 of the housing 3 into equipment requiring ammonia-air mixing. This application only has one ammonia inlet 5, or in other words, only an ammonia supply pipe as the main ammonia injection pipe, without any branch ammonia injection pipes. There is no turning or deceleration; the ammonia gas directly enters the housing 3 to mix with the air, avoiding the problem of moisture in the ammonia gas condensing into water and adhering to dust in the air, causing blockage of the ammonia injection branch pipe outlet.

[0028] Furthermore, the ammonia inlet 5 is opposite to the first turbulence section 601 or the second turbulence section 602 located on the other side of the casing 3 (meaning not on the same side as the ammonia inlet 5) near the air inlet 1, i.e. Figure 1 In the diagram shown, when the ammonia inlet 5 is located at the first position on the inner wall of the housing 3, a second turbulence part 602 is directly below the ammonia inlet 5. This second turbulence part 602 is close to the air inlet 1 and can increase the turbulence effect on the airflow, thereby enhancing the mixing effect of ammonia and air. Similarly, when the ammonia inlet 5 is located at the second position on the inner wall of the housing 3, a first turbulence part 601 is directly below the ammonia inlet 5. This first turbulence part 601 is close to the air inlet 1 and can increase the turbulence effect on the airflow, thereby enhancing the mixing effect of ammonia and air.

[0029] As an embodiment of the specific structure of the aforementioned baffle 6, in this embodiment, the baffle 6 is a semi-circular plate with a diameter equal to that of the shell 3. Specifically, the baffle 6 has a free end and a connecting end. The connecting end is arc-shaped and its bottom is fixedly connected to the inner wall of the shell 3. The free end is planar (e.g., rectangular) and its length is equal to the diameter of the cylindrical shell 3. Thus, the area of ​​the baffle 6 reaches the maximum radial acceptance of the shell 3, resulting in a large baffle area and a strong obstruction effect on the airflow, thereby enhancing the mixing effect of ammonia and air. In actual production, the shell 3 can be composed of two semi-circular tubes (and may also include two end caps, the specific size of which can be flexibly set according to the size of the air inlet 1 and the mixed gas outlet 4). After all the baffles 6 are installed (e.g., welded) on the inner wall of the shell according to the design drawings, the two semi-circular tube shells are then spliced ​​together to form a complete shell 3.

[0030] With the turbulence-disrupting section 6 inclined towards the mixed gas outlet 4, the free end of the turbulence-disrupting section 6 is 2-4 cm (minimum distance) from the axis of the housing 3. This serves both to block and guide the flow without affecting the overall direction of the mixed gas flow. Preferably, refer to Figure 1 As shown, the angle α between the flow-deflecting part 6 and the axis (or sidewall) of the housing 3 is 45° to 60°, for example: 45°, 46°, 48°, 50°, 52°, 54°, 55°, 58°, 60°, or other values. In this way, the flow-deflecting part 6 can play a certain guiding role. It can be understood that the area of ​​the flow-deflecting part 6 projected on the axial section of the housing 3 is less than half of the axial section area of ​​the housing 3.

[0031] Reference Figure 1 As shown, multiple second flow-disrupting sections 602 or first flow-disrupting sections 601, located on the same side as the ammonia inlet 5, are spaced apart on the inner wall of the housing 3 between the ammonia inlet 5 and the mixed gas outlet 4. Multiple first flow-disrupting sections 601 or second flow-disrupting sections 602, located on different sides from the ammonia inlet 5, are spaced apart on the inner wall of the housing 3 between the air inlet 1 and the mixed gas outlet 4. This arrangement allows the first flow-disrupting sections 601 and second flow-disrupting sections 602 to be staggered on the inner wall of the housing 3, creating conditions for the ammonia inlet 5 to be directly opposite the first flow-disrupting section 601 or second flow-disrupting section 602 near the air inlet 1. Whether the ammonia inlet 5 is specifically located at a first or second position on the inner wall of the housing 3 can be flexibly set according to actual needs; this embodiment does not impose any limitations. Multiple flow-dispersing sections 6 are spaced apart on the same side of the housing 3. The distance between two adjacent flow-dispersing sections 6 on the same side should not be too large, such as 30 cm, as this would affect the mixing effect of ammonia and air. However, it should not be too small, such as 5 cm, because we have found in applications that scale easily forms when the distance is less than 12 cm. Therefore, the reasonable spacing is 12-18 cm. ， Thus, while ensuring a certain level of turbulence, this reasonable spacing can prevent moisture in the ammonia from adhering to and depositing with dust in the air (scaling).

[0032] As a preferred embodiment of the above embodiments, in this embodiment, a first electrically controlled regulating valve (not shown in the figure) is installed on the air supply pipe near the air inlet 1 to automatically regulate the air flow rate; and a second electrically controlled regulating valve (not shown in the figure) is installed on the ammonia supply pipe near the ammonia inlet 5 to automatically regulate the ammonia flow rate. By simultaneously regulating and controlling the inlet ammonia flow rate and the air flow rate, this application can ensure that the concentration of the mixed gas (i.e., diluted ammonia) flowing out of the mixed gas outlet 4 does not exceed 5%.

[0033] For ease of installation and disassembly, the ammonia supply pipeline is connected to the housing 3 via a flange. The air supply pipeline is also connected to the housing 3 via a flange.

[0034] Reference Figure 2 As shown, the housing 3 has an inspection port 2 for cleaning and maintenance. It should be noted that during normal operation, the inspection port 2 is in a closed (i.e., blind) state.

[0035] As is known from common technical knowledge, this utility model can be implemented through other embodiments that do not depart from its spirit or essential characteristics. Therefore, the disclosed embodiments described above are merely illustrative in all respects and are not the only ones. All modifications within the scope of this utility model or its equivalents are included in this utility model.

Claims

1. A clog-resistant ammonia-air mixer, characterized in that, The ammonia-air mixer includes: A housing, one end of which is an air inlet, and an ammonia inlet is provided on the side wall of the housing; the other end of the housing is a mixed gas outlet; and A flow-dispersing section is provided within the housing at an angle toward the outlet of the mixed gas. The flow-dispersing section includes a first flow-dispersing section and a second flow-dispersing section. Along the airflow direction, the first flow-dispersing section and the second flow-dispersing section are alternately arranged on the inner wall of the housing. The first flow-dispersing section is connected to a first position on the inner wall of the housing, and the second flow-dispersing section is connected to a second position on the inner wall of the housing. The first position and the second position are respectively located on opposite sides of the inner wall of the housing.

2. The anti-clogging ammonia-air mixer according to claim 1, characterized in that, The ammonia inlet is opposite to the first or second turbulence section located on the other side of the housing near the air inlet.

3. The anti-clogging ammonia-air mixer according to claim 1, characterized in that, The turbulence-disrupting part is a semi-circular plate, which has a free end and a connecting end. The connecting end is arc-shaped and its bottom is connected to the inner wall of the shell. The free end is planar and its length is equal to the diameter of the cylindrical shell.

4. The anti-clogging ammonia-air mixer according to claim 3, characterized in that, The free end of the turbulence section is 2-4 cm away from the axis of the housing.

5. The anti-clogging ammonia-air mixer according to claim 1, characterized in that, The angle α between the turbulence-disrupting part and the axis of the housing is 45° to 60°.

6. The anti-clogging ammonia-air mixer according to claim 1, characterized in that, Multiple second or first turbulence sections located on the same side as the ammonia inlet are spaced apart on the inner wall of the housing between the ammonia inlet and the mixed gas outlet; Multiple first or second turbulence sections, located on different sides from the ammonia inlet, are spaced apart on the wall inside the housing between the air inlet and the mixed gas outlet.

7. The anti-clogging ammonia-air mixer according to claim 1, characterized in that, A first electrically operated regulating valve is installed on the air supply duct connected to the air inlet for automatically regulating the airflow; and A second electric regulating valve is installed on the ammonia supply pipeline connected to the ammonia inlet to automatically regulate the ammonia flow rate.

8. The anti-clogging ammonia-air mixer according to claim 7, characterized in that, The concentration of the air-ammonia mixture exiting the mixed gas outlet does not exceed 5%.

9. The anti-clogging ammonia-air mixer according to claim 7, characterized in that, The ammonia supply pipeline is arranged perpendicular to the shell, and the ammonia supply pipeline is connected to the shell via a flange; The air supply duct is connected to the housing via a flange.

10. The anti-clogging ammonia-air mixer according to claim 1, characterized in that, The housing has an inspection port for cleaning and maintenance.

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