Denitration rotational flow vortex street ammonia-air mixer

Abstract

The utility model relates to a denitration rotational flow vortex street ammonia-air mixer, which comprises a main pipeline, a vortex street ammonia-air mixer, a gas inlet pipe, a gas outlet pipe, a gas inlet pipe and a gas outlet pipe, one end of the ammonia pipeline is connected with the side wall of the main pipeline and is close to the air input end of the main pipeline; the vortex street turbulent flow columns are arranged in the main pipeline and are sequentially arranged at intervals in the axial direction of the main pipeline, the section of each vortex street turbulent flow column is in a V shape, the vertex angle of each vortex street turbulent flow column faces the air input end of the main pipeline, a swirl vane is arranged between every two adjacent vortex street turbulent flow columns, and the swirl vanes can rotate around the axis of the main pipeline; and the cyclone blades are driven to rotate through airflow. Ammonia gas and air can be fully mixed in a short distance, the mixed gas passes through the Karman vortex street generated by the last vortex street turbulent flow column and continues to use the flowing space in the airflow pipeline connected with the rear end of the main pipeline, and the mixing distance of the ammonia gas and the air is prolonged on the premise that the length of the main pipeline is not increased; the length of the whole mixer is shortened while the mixing effect is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas denitration, in particular to a denitration swirl vortex ammonia-air mixer. Background Art

[0002] The flue gas emitted by thermal power plants usually contains a large amount of nitrogen oxides NOx such as NO and NO2. These nitrogen oxides will form highly oxidizing photochemical smog under the action of ultraviolet rays, so the flue gas must be denitrated before being discharged. At present, there are two relatively mature flue gas denitrification technologies, selective catalytic reduction (SCR) technology and selective non-catalytic reduction (SNCR) technology. Both technologies convert NOx into ammonia (N2) and water vapor (H2O) by evenly spraying denitrification reducing agents (ammonia / urea) into the flue gas to achieve harmlessness of NOx. Among them, the SCR technology sets a reactor with a catalyst bed in the flue. When the flue gas and ammonia mixture passes through the catalyst, it will combine with the active sites on the catalyst, pass through the new reaction path, and cross the reaction energy barrier to achieve efficient removal of NOx.

[0003] In order to ensure efficient utilization of the catalyst and safety at the same time, ammonia must be fully mixed with dilution wind (air) before entering the SCR reactor and diluted into an ammonia-air mixture with a volume fraction of less than 5%. Therefore, an ammonia-air mixer must be installed after the ammonia / air mixing point to deconstruct and fully mix the ammonia / air mixed gas mass.

[0004] In order to ensure the mixing effect, the current ammonia-air mixer usually has a longer air flow channel, which results in a longer overall length of the mixer and requires a larger space during installation. Utility Model Content

[0005] Based on the above description, the utility model provides a denitration swirl vortex ammonia-air mixer to solve the problem that the current ammonia-air mixer has a long overall length and requires a large space during installation.

[0006] The technical solution of the utility model to solve the above technical problems is as follows:

[0007] The present application provides a denitration swirl vortex ammonia-air mixer, and the technical solution adopted is as follows:

[0008] A denitration swirl vortex ammonia-air mixer, comprising:

[0009] A main pipeline, one end of which is used to input air and the other end is used to output the mixed gas;

[0010] an ammonia pipeline, one end of which is connected to the side wall of the main pipeline and is close to the air input end of the main pipeline;

[0011] At least three vortex spoiler columns are arranged in the main pipeline, and the at least three vortex spoiler columns are arranged in sequence along the axial direction of the main pipeline. The cross-section of the vortex spoiler column is V-shaped and the top angle is facing the air input end of the main pipeline. Swirl blades are arranged between adjacent vortex spoiler columns. The swirl blades can rotate around the axis of the main pipeline and are suitable for driving the swirl blades to rotate through airflow.

[0012] Preferably, the axis of the ammonia pipeline is perpendicular to the axis of the main pipeline, and the center line of the output airflow of the ammonia pipeline is tangent to the inner circle of the main pipeline.

[0013] Preferably, the axis of the vortex spoiler column intersects the axis of the main pipeline at right angles.

[0014] Preferably, the axes of adjacent vortex spoiler columns are perpendicular.

[0015] Preferably, adjacent swirl blades rotate in opposite directions.

[0016] Preferably, it also includes a baffle assembly arranged in the main pipe, which includes a plurality of first baffles, the first baffles are conical in shape and coaxial with the main pipe, and the diameter of the first baffles gradually increases along the airflow direction, the maximum diameter of the first baffles is smaller than the inner diameter of the main pipe, and a second baffle is arranged between adjacent first baffles, the second baffles are truncated cone-shaped and coaxial with the main pipe, the maximum diameter of the second baffles is the same as the inner diameter of the main pipe, and the diameter of the first baffles gradually decreases along the airflow direction.

[0017] Preferably, the deflector assembly is located between the last vortex spoiler column and the last swirl blade along the airflow direction.

[0018] Preferably, at least two ammonia pipelines are provided, and the at least two ammonia pipelines are evenly spaced and distributed along the circumference of the main pipeline.

[0019] Compared with the prior art, the technical solution of this application has the following beneficial technical effects:

[0020] 1. When the ammonia-air mixer of the present application is in operation, air enters from the air input end of the main pipeline along the axial direction of the main pipeline, ammonia enters from the side of the main pipeline through the ammonia pipeline, ammonia and air are preliminarily mixed, and the preliminarily mixed mixed gas passes through the first vortex street spoiler column to generate a vortex, and the fluid is peeled off from the edge of the vortex street spoiler column to form an alternating vortex at the rear, and the ammonia and air are fully mixed in the vortex, and then pass through the first swirl blade, the swirl blade rotates under the action of the airflow, and drives the mixed gas to rotate to form a swirl perpendicular to the axis of the main pipeline, and the ammonia and air are fully mixed in the swirl, and then pass through the second vortex street spoiler column, the first vortex street spoiler column, the second ... The second swirl blade, the third vortex spoiler column, etc., the mixed gas passes through the last vortex spoiler column to generate a Karman vortex street, and the wide flow space of the airflow duct connected to the rear of the main duct is utilized to fully develop the vortex, and the ammonia and air are fully mixed; the application uses multi-stage vortex spoiler columns and swirl blades to enable ammonia and air to be fully mixed in a shorter distance. The Karman vortex street generated by the mixed gas after the last vortex spoiler column continues to utilize the flow space in the airflow duct connected to the rear end of the main duct, and the mixing distance of ammonia and air is extended without increasing the length of the main duct, thereby ensuring the mixing effect while shortening the length of the entire mixer;

[0021] 2. The center line of the ammonia pipeline output airflow of the present application is tangent to the inner circle of the main pipeline, and the ammonia pipeline output airflow enters the main pipeline from the tangential direction. The ammonia airflow enters the main pipeline and generates a vortex around the axis of the main pipeline, which is initially mixed with the air entering the main pipeline axially, thereby improving the effect of subsequent mixing;

[0022] 3. In the present application, a baffle assembly is provided, and when the mixed gas passes through the first baffle, it passes through the first baffle and the inner wall of the main pipe and enters between the first baffle and the second baffle. The mixed gas further passes through the center of the second baffle under the guidance of the second baffle. The mixed gas passes through multiple first baffles and second baffles in sequence. The first baffles and the second baffles are alternately arranged to extend the flow path of the mixed gas, shorten the length of the mixer and ensure the mixing effect of ammonia and air. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the structure of a denitration swirl vortex ammonia-air mixer provided in an embodiment of the utility model;

[0024] Figure 2 A schematic structural diagram of the denitration swirl vortex ammonia-air mixer from another perspective provided in an embodiment of the utility model;

[0025] Figure 3 This is a schematic structural diagram of a denitration swirl vortex ammonia-air mixer provided in an embodiment of the utility model when a baffle assembly is provided.

[0026] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0027] 1. Main pipeline; 2. Ammonia pipeline; 3. Vortex street spoiler column; 4. Swirl blade; 5. Rotating shaft; 6. First baffle; 7. Second baffle. DETAILED DESCRIPTION

[0028] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0030] It will be appreciated that spatial relationship terms such as "under," "beneath," "below," "under," "above," "above," etc., may be used herein to describe the relationship of an element or feature shown in the figures to other elements or features. It will be appreciated that, in addition to the orientations shown in the figures, spatial relationship terms also include different orientations of the device in use and operation. For example, if the device in the accompanying drawings is flipped, an element or feature described as "under other elements" or "under it" or "under it" will be oriented as being "above" the other elements or features. Thus, the exemplary terms "under" and "under" may include both upper and lower orientations. In addition, the device may also include additional orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptors used herein are interpreted accordingly.

[0031] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element, or connected to the other element through an intermediate element. The "connection" in the following embodiments should be understood as "electrical connection", "communication connection", etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0032] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" etc. specify the presence of stated features, wholes, steps, operations, components, parts or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof.

[0033] Reference Figure 1-3 As shown, an embodiment of the present application provides a denitration swirl vortex ammonia-air mixer, which includes a main pipeline 1 and an ammonia pipeline 2. One end of the main pipeline 1 is used to input air, and the other end is used to output the mixed gas. One end of the ammonia pipeline 2 is connected to the side wall of the main pipeline 1 and is close to the air input end of the main pipeline 1. At least three vortex spoiler columns 3 are arranged in sequence along the axial direction of the main pipeline 1. The cross-section of the vortex spoiler column 3 is V-shaped and the top angle is facing the air input end of the main pipeline 1. Swirl blades 4 are provided between adjacent vortex spoiler columns 3. The swirl blades 4 can rotate around the axis of the main pipeline 1, and are suitable for driving the swirl blades 4 to rotate by airflow.

[0034] During operation, air enters the main pipeline 1 axially from the air input end of the main pipeline 1, and ammonia enters from the side of the main pipeline 1 through the ammonia pipeline 2. The ammonia and air are preliminarily mixed. The preliminarily mixed mixed gas passes through the first vortex spoiler column 3 to generate a vortex. The fluid is peeled off from the edge of the vortex spoiler column 3 to form an alternating vortex at the rear. The ammonia and air are fully mixed in the vortex, and then pass through the first swirl blade 4. The swirl blade 4 rotates under the action of the airflow, driving the mixed gas to rotate to form a swirl perpendicular to the axis of the main pipeline 1. The ammonia and air are fully mixed in the swirl, and then pass through the second vortex spoiler column 3, the second swirl blade 4, the third vortex spoiler column 3, etc. in sequence. The mixed gas passes through the last vortex spoiler column 3 to generate a Karman vortex street. Using the wide flow space of the airflow pipeline connected to the rear of the main pipeline 1, the vortex is fully developed, the ammonia and air are fully mixed, and the mixing distance of the ammonia and air is extended without increasing the length of the main pipeline 1, thereby ensuring the mixing effect while shortening the length of the entire mixer.

[0035] Reference Figure 1-2 As shown, specifically, the main pipeline 1 and the ammonia pipeline 2 are both pipelines with circular cross-sections, which can be made of stainless steel or other materials as long as they meet the design specifications. Flanges are provided at both ends of the main pipeline 1 and at the end of the ammonia pipeline 2 away from the main pipeline 1 to facilitate connection with other pipelines.

[0036] Reference Figure 1-2 As shown, further, the ammonia pipeline 2 is set with its axis perpendicular to the axis of the main pipeline 1, and the center line of the airflow output by the ammonia pipeline 2 is tangent to the inner circle of the main pipeline 1. When ammonia is input into the main pipeline 1 through the ammonia pipeline 2, the ammonia airflow is input into the main pipeline 1 tangentially along the inner circle of the main pipeline 1. The ammonia airflow enters the main pipeline 1 to generate a vortex around the axis of the main pipeline 1, and is preliminarily mixed with the air axially entering the main pipeline 1 to improve the subsequent mixing effect.

[0037] Furthermore, at least two ammonia pipelines 2 can be provided, and at least two ammonia pipelines 2 are evenly spaced along the circumference of the main pipeline 1, and at least two ammonia pipelines 2 have the same output airflow direction, so that ammonia is input into the main pipeline 1 through multiple paths, thereby improving the initial mixing effect of ammonia and air.

[0038] Reference Figure 1-2 As shown, further, the axis of the vortex spoiler column 3 intersects the axis of the main pipeline 1 at right angles, and the axes of adjacent vortex spoiler columns 3 are perpendicular, and the rotation directions of adjacent swirl blades 4 are opposite, so that when the mixed gas passes through two adjacent vortex spoiler columns 3, vortices in different directions are generated, and when the mixed gas passes through two adjacent swirl blades 4, swirls in different rotation directions are generated, thereby improving the mixing effect of ammonia and air.

[0039] Reference Figure 1-2 As shown, specifically, when the vortex spoiler column 3 and the swirl blade 4 are installed, both ends of the vortex spoiler column can be directly fixed to the inner wall of the main pipe 1, and two adjacent swirl blades 4 are connected by a rotating shaft 5, and the rotating shaft 5 is fixed to the vortex spoiler column 3 between the two adjacent swirl blades 4. In this embodiment, three vortex spoiler columns 3 and two swirl blades 4 are provided for illustration.

[0040] Specifically, the spacing between adjacent swirl blades 4, the spacing between adjacent vortex flow columns, the spacing between adjacent vortex flow columns and swirl blades 4, and the size parameters of the vortex flow columns and swirl blades 4 are designed according to actual conditions to ensure the mixing effect of ammonia and air.

[0041] Reference Figure 3 As shown, further, in other embodiments, a baffle assembly can be arranged in the main pipe 1, and the baffle assembly includes a plurality of first baffles 6, the first baffles 6 are conical in shape and coaxial with the main pipe 1, and the diameter of the first baffles 6 gradually increases along the airflow direction, and the maximum diameter of the first baffles 6 is smaller than the inner diameter of the main pipe 1, and second baffles 7 are arranged between adjacent first baffles 6, the second baffles 7 are truncated cone-shaped and coaxial with the main pipe 1, the maximum diameter of the second baffles 7 is the same as the inner diameter of the main pipe 1, and the diameter of the first baffles 6 gradually decreases along the airflow direction.

[0042] Specifically, the baffle assembly is arranged between the last vortex street spoiler column 3 and the last swirl blade 4 along the airflow direction, and the first baffle 6 can be fixedly connected to the inner wall of the main pipeline 1 by multiple connecting rods, and the second baffle 7 is attached to and fixed to the inner wall of the main pipeline 1. Through this arrangement, when the mixed gas passes through the first baffle 6, it passes between the first baffle 6 and the inner wall of the main pipeline 1 and enters between the first baffle 6 and the second baffle 7. The mixed gas further passes through the center of the second baffle 7 under the guidance of the second baffle 7. The mixed gas passes through multiple first baffles 6 and second baffles 7 in sequence. The first baffles 6 and the second baffles 7 are alternately arranged to extend the flow path of the mixed gas, shorten the length of the mixer and ensure the mixing effect of ammonia and air. In this embodiment, three first baffles 6 and two second baffles 7 are provided for illustration.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A denitration swirl vortex ammonia-air mixer, characterized in that: include: A main pipeline (1), one end of which is used to input air and the other end of which is used to output mixed gas; an ammonia pipeline (2), one end of which is connected to the side wall of the main pipeline (1) and is close to the air input end of the main pipeline (1); At least three vortex spoiler columns (3) are arranged in the main pipeline (1), and the at least three vortex spoiler columns (3) are arranged in sequence and spaced apart along the axial direction of the main pipeline (1). The cross-section of the vortex spoiler columns (3) is V-shaped, and the top angle faces the air input end of the main pipeline (1). Swirl blades (4) are arranged between adjacent vortex spoiler columns (3), and the swirl blades (4) can rotate around the axis of the main pipeline (1), and are suitable for driving the swirl blades (4) to rotate by airflow.

2. The denitration swirl vortex ammonia-air mixer according to claim 1, characterized in that: The axis of the ammonia pipeline (2) is perpendicular to the axis of the main pipeline (1), and the center line of the output airflow of the ammonia pipeline (2) is tangent to the inner circle of the main pipeline (1).

3. The denitration swirl vortex ammonia-air mixer according to claim 1, characterized in that: The axis of the vortex spoiler column (3) intersects the axis of the main pipeline (1) at right angles.

4. The denitration swirl vortex ammonia-air mixer according to claim 3, characterized in that: The axes of adjacent vortex spoiler columns (3) are perpendicular.

5. The denitration swirl vortex ammonia-air mixer according to claim 1, characterized in that: The adjacent swirl blades (4) rotate in opposite directions.

6. The denitration swirl vortex ammonia-air mixer according to claim 1, characterized in that: It also includes a baffle assembly arranged in the main pipe (1), which includes a plurality of first baffles (6), the first baffles (6) are conical and coaxial with the main pipe (1), and the diameter of the first baffles (6) gradually increases along the airflow direction, and the maximum diameter of the first baffles (6) is smaller than the inner diameter of the main pipe (1), and second baffles (7) are arranged between adjacent first baffles (6), the second baffles (7) are truncated cone-shaped and coaxial with the main pipe (1), the maximum diameter of the second baffles (7) is the same as the inner diameter of the main pipe (1), and the diameter of the first baffles (6) gradually decreases along the airflow direction.

7. The denitration swirl vortex ammonia-air mixer according to claim 6, characterized in that: The deflector assembly is located between the last vortex spoiler column (3) and the last swirl blade (4) along the airflow direction.

8. The denitration swirl vortex ammonia-air mixer according to claim 1, characterized in that: At least two ammonia pipelines (2) are provided, and the at least two ammonia pipelines (2) are evenly spaced and distributed along the circumference of the main pipeline (1).

Images