Ammonia gas nozzle and denitration device
By installing a guide on the outside of the ammonia nozzle, the injection range is expanded, solving the problem of uneven mixing in the ammonia nozzle, achieving a more efficient reaction between ammonia and flue gas, and reducing ammonia escape and operating costs.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- HOHHOT KELIN THERMOELECTRICITY CO LTD
- Filing Date
- 2025-11-10
- Publication Date
- 2026-06-18
Smart Images
Figure CN2025133754_18062026_PF_FP_ABST
Abstract
Description
Ammonia nozzles and denitrification devices Technical Field
[0001] This invention relates to the field of denitrification equipment technology, specifically to an ammonia nozzle and a denitrification device. Background Technology
[0002] Most ammonia nozzles in denitrification systems are made of short tubes for direct injection. This type of nozzle has a simple structure and low manufacturing cost. However, the ammonia gas is injected along the nozzle axis, forming an ammonia gas flow with a diameter of about 150-250mm. This shape of ammonia gas flow can only mix with a small amount of flue gas. The flue gas near the nozzle has a high mixing ratio with ammonia, while the flue gas far from the nozzle has a low mixing ratio with ammonia. The mixing effect is not ideal, and some NOx in the flue gas does not mix with ammonia, so it cannot undergo a sufficient chemical reaction. This results in high NOx levels in the boiler exhaust gas. Flue gas with a high mixing ratio has a large ammonia escape (NH3) after chemical reaction. Long-term operation can cause air preheater blockage and high ammonia consumption.
[0003] In addition, due to the uneven mixing of flue gas and ammonia, the chemical reaction is slow, and the denitrification control cannot be automatically controlled, forcing the use of manual control, which increases the unit's operating costs and safety risks. Summary of the Invention
[0004] The technical problem to be solved by the present invention is to address the defects and deficiencies of the prior art by proposing an ammonia nozzle that can spray over a wider area, increase the mixing ratio, reduce ammonia escape, increase the chemical reaction rate, and thus improve the denitrification effect.
[0005] The ammonia nozzle of this invention includes a body and a guide member. The body has an injection chamber extending along its axial direction. One end of the injection chamber is connected to a nozzle pipe, and the other end is an injection port. The guide member is located outside the injection port and its front end is connected to the body. The orthographic projection of the front end of the guide member on a first plane is located inside the injection port. At least a portion of the outer peripheral edge of the orthographic projection of the tail end of the guide member on the first plane is located outside the injection port. The first plane is the plane where the injection port is located.
[0006] In the ammonia nozzle of this embodiment of the invention, the guide member is located outside the injection port and its front end is connected to the body. The orthographic projection of the front end of the guide member on a first plane is located inside the injection port, and at least a portion of the outer peripheral edge of the orthographic projection of the tail end of the guide member on the first plane is located outside the injection port. The first plane is the plane where the injection port is located. Thus, under the guidance of the guide member, the injection port can spray over a wider range, increase the mixing ratio, reduce ammonia escape, increase the chemical reaction rate, and thereby improve the denitrification effect.
[0007] In some embodiments, the connection surface between the front end and the rear end of the guide member is a guide surface, and the cross-sectional area of the guide surface gradually increases in the direction away from the body.
[0008] In some embodiments, the guide surface is an inwardly concave arc surface.
[0009] In some embodiments, the tangent at the end of the guide surface away from the body is parallel to the injection port.
[0010] In some embodiments, the orthographic projection of the tail end of the guide surface onto the first plane is a circle.
[0011] In some embodiments, the inner wall of the injection port is provided with an inwardly extending connecting rod, and the guide is connected to the connecting rod.
[0012] In some embodiments, the connecting rods are a plurality of rods arranged circumferentially at intervals along the nozzle, and the inner ends of the plurality of connecting rods are connected to each other.
[0013] In some embodiments, the orthographic projection of the connection point of the plurality of connecting rods onto the first plane coincides with the center of the injection port.
[0014] In some embodiments, the injection chamber includes an acceleration section and a flaring section connected together. The acceleration section is connected to the nozzle and the cross-sectional area of the acceleration section gradually decreases in the direction away from the nozzle. The flaring section is connected to the injection port and the cross-sectional area of the flaring section gradually increases in the direction close to the injection port.
[0015] The denitrification device of this invention includes the ammonia nozzle described in the above embodiments.
[0016] The denitrification device of this invention employs the aforementioned ammonia nozzle, with a guide member located outside the injection port and its front end connected to the main body. The orthographic projection of the front end of the guide member on a first plane is located inside the injection port, and at least a portion of the outer peripheral edge of the orthographic projection of the tail end of the guide member on the first plane is located outside the injection port. The first plane is the plane where the injection port is located. Thus, under the guidance of the guide member, the injection port can spray over a wider range, increasing the mixing ratio, reducing ammonia escape, increasing the chemical reaction rate, and thereby improving the denitrification effect. Attached Figure Description
[0017] Figure 1 is a schematic diagram of the structure of the ammonia nozzle according to an embodiment of the present invention.
[0018] Figure label:
[0019] Body 1, injection chamber 11, guide component 2, guide surface 21. Detailed Implementation
[0020] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.
[0021] As shown in Figure 1, the ammonia nozzle of this embodiment of the invention includes a body 1 and a guide member 2. The body 1 has a spray chamber 11 extending along its axial direction. One end of the spray chamber 11 is connected to a nozzle pipe, and the other end is a spray port. The guide member 2 is located outside the spray port and its front end is connected to the body 1. The orthographic projection of the front end of the guide member 2 on a first plane is located inside the spray port. At least a portion of the outer peripheral edge of the orthographic projection of the tail end of the guide member 2 on the first plane is located outside the spray port. The first plane is the plane where the spray port is located.
[0022] Understandably, the ammonia gas ejected from the nozzle will flow under the guidance of the guide component 2. Since the outer end of the guide component 2 expands outward and exceeds the range of the nozzle, it can guide the ammonia gas to be injected over a large area, so that the ammonia gas can be fully mixed with the flue gas over a larger area, thereby increasing the mixing ratio, reducing ammonia escape, increasing the chemical reaction rate, and thus improving the denitrification effect.
[0023] In the ammonia nozzle of this embodiment of the invention, the guide member 2 is located outside the injection port and its front end is connected to the body 1. The orthographic projection of the front end of the guide member 2 on the first plane is located inside the injection port, and at least part of the outer peripheral edge of the orthographic projection of the tail end of the guide member 2 on the first plane is located outside the injection port. The first plane is the plane where the injection port is located. Thus, under the guidance of the guide member 2, the injection port can spray over a wider range, increase the mixing ratio, reduce ammonia escape, increase the chemical reaction rate, and thus improve the denitrification effect.
[0024] In some embodiments, the connecting surface between the front end and the rear end of the guide member 2 is a guide surface 21, and the cross-sectional area of the guide surface 21 gradually increases in the direction away from the body 1. As a result, the ammonia gas ejected from the injection port can gradually expand outward along the guide surface 21, thereby increasing the injection range.
[0025] Optionally, the guide surface 21 is an inwardly concave arc surface. As a result, the flow of ammonia gas along the guide member 2 is more stable, and the arc surface structure can change the airflow direction, causing the ammonia gas to disperse outward.
[0026] Preferably, the tangent at the end of the guide surface 21 furthest from the body 1 is parallel to the injection port. In other words, the tail end of the guide surface 21 extends parallel to the injection port, allowing ammonia gas to be horizontally injected outward along the tail end of the guide surface 21, thus forming a large-scale injection ring. This maximizes the ammonia injection range, effectively increasing the amount of ammonia gas mixed with flue gas, ensuring the mixing ratio of flue gas and ammonia gas, and improving the denitrification chemical reaction rate. Furthermore, by changing the ammonia gas injection direction, the guide surface 21 prevents the ammonia gas from being injected back and forth, thus solving the problem of high flue gas mixing ratio with traditional ammonia nozzles and nozzle accessories, low mixing ratio with flue gas farther from the nozzle, and a large difference in the mixing ratio between near and far flue gas.
[0027] Preferably, the orthographic projection of the tail end of the guide surface 21 onto the first plane is circular. That is, if the tail end of the guide 2 is circular, the ammonia gas can be injected outward along the tail end of the guide 2 to form an annular injection ring, resulting in a large injection range and a large amount of ammonia gas mixed with flue gas. Specifically, as shown in Figure 1, the guide 2 is trumpet-shaped, with its front tip serving as a connecting end connected to the body 1. The outwardly expanding arc-shaped guide surface 21 can guide the flow of ammonia gas and ultimately inject it horizontally outward from the edge, forming a large-range annular injection ring.
[0028] In some embodiments, the inner wall of the injection nozzle is provided with an inwardly extending connecting rod, and the guide member 2 is connected to the connecting rod. That is, the inner wall of the body 1 is provided with a connecting rod, which extends inward and its end serves as a fulcrum to connect to the guide member 2.
[0029] Furthermore, multiple connecting rods are arranged circumferentially around the injection port, with their inner ends connected together. In other words, the inner ends of the multiple connecting rods are connected together to form an installation fulcrum. The connecting rods are spaced apart, which does not affect the ammonia gas injection. The multiple connecting rods can provide more stable support and ensure the stability of the guide 2 installation.
[0030] Preferably, the orthographic projection of the connection point of the multiple connecting rods on the first plane coincides with the center of the injection port. Thus, the guide 2 is installed at the center of the injection port, facilitating the uniform outward diffusion of ammonia gas.
[0031] In some embodiments, the injection chamber 11 includes an acceleration section and a flaring section connected together. The acceleration section is connected to the nozzle and its cross-sectional area gradually decreases in the direction away from the nozzle. The flaring section is connected to the injection port and its cross-sectional area gradually increases in the direction closer to the injection port. In other words, the injection chamber 11 has a structure design that first contracts and then expands along the injection direction, thereby increasing the ammonia gas velocity at the nozzle outlet, improving the ammonia gas stiffness at the nozzle outlet, and expanding the mixing range of ammonia gas and flue gas.
[0032] The denitrification device of this invention includes the ammonia nozzle of the above embodiment.
[0033] In the denitrification device of this embodiment, by employing the aforementioned ammonia nozzle, the guide member 2 is located outside the injection port and its front end is connected to the main body 1. The orthographic projection of the front end of the guide member 2 on the first plane is located inside the injection port, and at least a portion of the outer peripheral edge of the orthographic projection of the tail end of the guide member 2 on the first plane is located outside the injection port. The first plane is the plane where the injection port is located. Thus, under the guidance of the guide member 2, the injection port can spray over a wider range, increase the mixing ratio, reduce ammonia escape, increase the chemical reaction rate, and thereby improve the denitrification effect.
[0034] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" 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 invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.
[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0036] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0037] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0038] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0039] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.
Claims
1. An ammonia nozzle, characterized in that, The device includes a body and a guide member. The body has a spray chamber extending along its axial direction. One end of the spray chamber is connected to a nozzle, and the other end is a spray port. The guide member is located outside the spray port, and its front end is connected to the body. The orthographic projection of the front end of the guide member on a first plane is located inside the spray port. At least a portion of the outer peripheral edge of the orthographic projection of the tail end of the guide member on the first plane is located outside the spray port. The first plane is the plane where the spray port is located.
2. The ammonia nozzle according to claim 1, characterized in that, The connecting surface between the front end and the rear end of the guide member is a guide surface, and the cross-sectional area of the guide surface gradually increases in the direction away from the body.
3. The ammonia nozzle according to claim 2, characterized in that, The guide surface is an inwardly concave arc surface.
4. The ammonia nozzle according to claim 3, characterized in that, The tangent at the end of the guide surface furthest from the body is parallel to the injection port.
5. The ammonia nozzle according to claim 2, characterized in that, The orthographic projection of the tail end of the guide surface onto the first plane is a circle.
6. The ammonia nozzle according to claim 1, characterized in that, The inner wall of the injection nozzle is provided with an inwardly extending connecting rod, and the guide is connected to the connecting rod.
7. The ammonia nozzle according to claim 6, characterized in that, The connecting rods are a plurality of rods arranged at circumferential intervals along the nozzle, and the inner ends of the plurality of connecting rods are connected together.
8. The ammonia nozzle according to claim 7, characterized in that, The orthographic projection of the connection points of the multiple connecting rods onto the first plane coincides with the center of the injection port.
9. The ammonia nozzle according to claim 1, characterized in that, The injection chamber includes an acceleration section and a flaring section connected together. The acceleration section is connected to the nozzle and the cross-sectional area of the acceleration section gradually decreases in the direction away from the nozzle. The flaring section is connected to the injection port and the cross-sectional area of the flaring section gradually increases in the direction close to the injection port.
10. A denitrification device, characterized in that, Includes an ammonia nozzle according to any one of claims 1-9.