Spherical ammonia spraying device suitable for small industrial boiler SCR denitration system

Abstract

The utility model discloses a spherical ammonia spraying device suitable for a small industrial boiler SCR (Selective Catalytic Reduction) denitration system, which relates to the technical field of SCR denitration and comprises a spherical ammonia spraying buffer chamber, the interior of the spherical ammonia spraying buffer chamber is hollow, and a plurality of ammonia ejectors communicated with an inner cavity of the spherical ammonia spraying buffer chamber are arranged on the outer side wall of the spherical ammonia spraying buffer chamber. A plurality of ammonia injectors are arranged on the outer surface of the spherical ammonia injection buffer chamber in a divergent manner; the ammonia gas ejector comprises an ammonia spraying pipe and a rotary driving assembly; one end of the ammonia spraying pipe is fixed to the outer side wall of the spherical ammonia spraying buffer chamber, a plurality of annularly-arranged spraying openings are formed in the end face of the other end of the ammonia spraying pipe, and the rotation driving assembly comprises a connecting shaft, a rotating body and turbulent flow blades. The connecting shaft is detachably connected to the end face of the ammonia spraying pipe and located on the inner side of the spraying opening, the rotating body is rotationally connected to the end, away from the ammonia spraying opening, of the connecting shaft, and the turbulent flow blades are fixed to the outer side wall of the rotating body; flue gas flows to drive the spoiler blades to rotate so as to disturb mixing of ammonia gas and flue gas and prevent the injection orifice from being blocked.

Description

Technical Field

[0001] This utility model relates to the field of SCR denitrification technology, and more specifically to a spherical ammonia injection device suitable for SCR denitrification systems in small industrial boilers. Background Technology

[0002] With increasingly stringent environmental regulations, the control of nitrogen oxide (NOx) emissions from industrial boilers has become a crucial issue. Selective catalytic reduction (SCR) technology is widely used in flue gas treatment systems for industrial boilers due to its highly efficient NOx removal capabilities.

[0003] However, for small industrial boilers, the flue space is narrow, the flue gas volume is relatively small, but the NOx emission concentration is high; existing ammonia injection devices are bulky and difficult to adapt to small industrial boilers; for example, in-line ammonia injection pipes require a large horizontal installation area, which obstructs the airflow in the flue and limits the ammonia coverage area; the mixing efficiency is low; traditional single-point or unidirectional injection modes are prone to causing local accumulation of ammonia, making it difficult to mix fully with the flue gas; at the same time, the flue gas may contain a large amount of particulate matter and corrosive gases, which are easy to accumulate inside the injector and cause blockage.

[0004] Therefore, how to provide a spherical ammonia injection device that improves mixing effect, effectively prevents ammonia injector blockage, and is suitable for small industrial boiler SCR denitrification systems is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, the present invention provides a spherical ammonia injection device suitable for SCR denitrification systems of small industrial boilers, aiming to solve the above-mentioned technical problems.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A spherical ammonia injection device suitable for SCR denitrification systems of small industrial boilers includes a spherical ammonia injection buffer chamber. The interior of the spherical ammonia injection buffer chamber is hollow. Multiple ammonia injectors communicating with the interior cavity are installed on the outer wall of the spherical ammonia injection buffer chamber. The multiple ammonia injectors are arranged in a divergent manner on the outer surface of the spherical ammonia injection buffer chamber.

[0008] The ammonia injector includes an ammonia injection pipe and a rotary drive assembly. One end of the ammonia injection pipe is fixed to the outer wall of the spherical ammonia injection buffer chamber, and the other end has multiple annularly arranged injection ports. The rotary drive assembly includes a connecting shaft, a rotating body, and baffle blades. The connecting shaft is detachably connected to the end face of the ammonia injection pipe and is located inside the injection ports. The rotating body is rotatably connected to the end of the connecting shaft away from the injection ports, and the baffle blades are fixed to the outer wall of the rotating body. The baffle blades are rotated by the flow of flue gas to agitate the mixing of ammonia and flue gas and prevent the injection ports from becoming blocked.

[0009] Through the above technical solution, this utility model provides a spherical ammonia injection device suitable for SCR denitrification systems in small industrial boilers. The spherical ammonia injection buffer chamber effectively solves the problem that existing ammonia injection devices are bulky and difficult to adapt to small industrial boilers. The spherical design makes the device more compact and suitable for narrow flue spaces. At the same time, the injection direction of multiple ammonia injectors is away from the center of the sphere, expanding the ammonia coverage area and ensuring that the ammonia is evenly dispersed to the flue section. The flue gas flow drives the turbulence blades to rotate, forming turbulent disturbances, forcing the ammonia to mix with the flue gas, and improving the denitrification reaction efficiency. The blade rotation can remove ash accumulation near the injection port and avoid blockage caused by particulate matter deposition.

[0010] Preferably, in the above-mentioned spherical ammonia injection device suitable for SCR denitrification systems in small industrial boilers, an arc-shaped buffer plate is installed inside the spherical ammonia injection buffer chamber. The arc-shaped buffer plate reduces the ammonia gas velocity entering the buffer chamber in layers, preventing high-speed airflow from directly impacting the ammonia injection pipe, reducing local over-injection, and ensuring that ammonia gas is evenly distributed to each injector; the arc-shaped flow guide optimizes the airflow path, reduces the generation of eddies in the buffer chamber, reduces energy loss, and improves ammonia gas delivery efficiency.

[0011] Preferably, in the above-mentioned spherical ammonia injection device suitable for a small industrial boiler SCR denitrification system, the arc-shaped buffer plate is located inside the spherical ammonia injection buffer chamber, on the side away from the flue gas flow direction. The flue gas flow rate is relatively low on the outer side of the spherical ammonia injection buffer chamber away from the flue gas flow direction. The purpose of placing the arc-shaped buffer plate inside the spherical ammonia injection buffer chamber, on the side away from the flue gas flow direction, is to disperse the ammonia gas there and prevent excessive ammonia gas, thus avoiding unnecessary waste.

[0012] Preferably, in the above-mentioned spherical ammonia injection device suitable for SCR denitrification systems in small industrial boilers, the connecting shaft is threadedly connected to the end face of the ammonia injection pipe. The threaded connection simplifies the disassembly and assembly process of the rotary drive assembly, facilitates quick replacement or cleaning of the rotating body and blades during maintenance, and reduces maintenance costs.

[0013] Preferably, in the above-mentioned spherical ammonia injection device suitable for a small industrial boiler SCR denitrification system, the rotating body is an impeller body, and the number of turbulence blades is multiple, which are arranged in a ring and fixed on the side wall of the impeller body. The ring-arranged blades create multi-directional turbulence, breaking the laminar flow state of flue gas and ammonia, forcing mixing, and shortening the mixing time; the impeller body provides a larger moment of inertia, so that the blades can still maintain stable rotation when the flue gas velocity fluctuates, avoiding uneven mixing caused by intermittent stoppage.

[0014] Preferably, the spherical ammonia injection device for a small industrial boiler SCR denitrification system further includes an ammonia delivery pipe, the output end of which is connected to the interior of the spherical ammonia injection buffer chamber. Supplying ammonia to the buffer chamber via an independent delivery pipe avoids the uneven pressure drop caused by multiple branch pipes, ensures stable ammonia flow, and the centralized delivery design reduces pipeline complexity and adapts to the space constraints of small flues.

[0015] Preferably, in the above-mentioned spherical ammonia injection device suitable for SCR denitrification systems in small industrial boilers, the ammonia delivery pipe is perpendicular to the flue gas flow direction. This vertical arrangement reduces the obstruction of the delivery pipe to the flue gas flow field and prevents flue gas turbulence from affecting the ammonia injection direction; the ammonia enters the flue vertically, forming a cross-jet with the horizontally flowing flue gas, and utilizes shear force to accelerate mixing.

[0016] Preferably, in the above-mentioned spherical ammonia injection device suitable for SCR denitrification systems in small industrial boilers, an electromagnetic flow valve is installed on the ammonia delivery pipe. The electromagnetic valve adjusts the ammonia supply in real time, dynamically matching changes in NOx concentration in the flue gas, reducing ammonia escape, and lowering operating costs. It also links with the SCR system control system to improve the response speed and accuracy of the denitrification process, adapting to the load fluctuations of the industrial boiler.

[0017] As can be seen from the above technical solution, compared with the prior art, this utility model discloses a spherical ammonia injection device suitable for SCR denitrification systems in small industrial boilers, which has the following beneficial effects:

[0018] 1. This utility model uses multiple ammonia injectors arranged in a ring on the outer wall of a spherical ammonia injection buffer chamber, with the injection direction away from the center of the sphere. This design can ensure the uniform distribution of ammonia in the flue, avoid local accumulation of ammonia, improve the selectivity and efficiency of the denitrification reaction, and the turbulence blades in the rotary drive assembly can effectively improve the mixing efficiency of ammonia and flue gas, ensuring that ammonia can be evenly distributed in the flue gas, thereby improving the efficiency of the denitrification reaction.

[0019] 2. The use of the injection port and rotary drive assembly of this utility model can prevent particulate matter and corrosive gases in the flue gas from accumulating inside the injector, thereby effectively avoiding injection port blockage and ensuring the long-term stable operation of the ammonia injection device.

[0020] 3. This utility model has a compact structure and is particularly suitable for installation in small industrial boilers with narrow flue spaces. It will not cause excessive resistance to flue gas flow, while meeting the denitrification efficiency requirements of small boilers. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0022] Figure 1 The attached figure is an isometric view of the spherical ammonia injection device for a small industrial boiler SCR denitrification system provided by this utility model;

[0023] Figure 2 The attached figure is a schematic diagram of the ammonia injector provided by this utility model;

[0024] Figure 3 The attached figure is a schematic diagram of the structure of the spherical ammonia spraying buffer chamber with an arc-shaped buffer plate installed inside, as provided by this utility model.

[0025] Figure 4 The attached figure is a front view of the spherical ammonia injection device for SCR denitrification systems of small industrial boilers provided by this utility model;

[0026] Figure 5 The attached figure is a top view of the spherical ammonia injection device for SCR denitrification systems of small industrial boilers provided by this utility model.

[0027] in:

[0028] 1-Spherical ammonia injection buffer chamber; 2-Ammonia injector; 21-Ammonia injection pipe; 211-Injection port; 22-Rotary drive assembly; 221-Connecting shaft; 222-Rotating body; 223-Breakthrough blade; 3-Arc-shaped buffer plate; 4-Ammonia delivery pipe; 5-Solenoid flow valve. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] See appendix Figure 1 To be continued Figure 5 This utility model discloses a spherical ammonia injection device suitable for SCR denitrification system of small industrial boilers, including a spherical ammonia injection buffer chamber 1. The spherical ammonia injection buffer chamber 1 is hollow inside. Multiple ammonia injectors 2 that communicate with the inner cavity are installed on the outer wall of the spherical ammonia injection buffer chamber 1. The multiple ammonia injectors 2 are arranged in a divergent manner on the outer surface of the spherical ammonia injection buffer chamber 1.

[0031] The ammonia injector 2 includes an ammonia injection pipe 21 and a rotary drive assembly 22. One end of the ammonia injection pipe 21 is fixed to the outer wall of the spherical ammonia injection buffer chamber 1, and the other end face is provided with a plurality of annularly arranged injection ports 211. The rotary drive assembly 22 includes a connecting shaft 221, a rotating body 222, and a baffle blade 223. The connecting shaft 221 is detachably connected to the end face of the ammonia injection pipe 21 and is located inside the injection port 211. The rotating body 222 is rotatably connected to the end of the connecting shaft 221 away from the injection port 211. The baffle blade 223 is fixed to the outer wall of the rotating body 222. The baffle blade 223 is rotated by the flow of flue gas to agitate the mixing of ammonia and flue gas and prevent the injection port 211 from being blocked.

[0032] To further optimize the above technical solution, an arc-shaped buffer plate 3 is installed inside the spherical ammonia injection buffer chamber 1.

[0033] To further optimize the above technical solution, the arc-shaped buffer plate 3 is located in the spherical ammonia injection buffer chamber and is on the side away from the direction of flue gas flow.

[0034] To further optimize the above technical solution, the connecting shaft 221 is threaded to the end face of the ammonia injection pipe 21.

[0035] To further optimize the above technical solution, the rotating body 222 is the impeller body, and the number of turbulence blades 223 is multiple, with multiple turbulence blades 223 arranged in a ring and fixed on the side wall of the impeller body.

[0036] To further optimize the above technical solution, an ammonia gas delivery pipe 4 is also included, the output end of which is connected to the interior of the spherical ammonia injection buffer chamber 1.

[0037] To further optimize the above technical solution, the ammonia delivery pipe 4 is perpendicular to the flue gas flow direction.

[0038] To further optimize the above technical solution, an electromagnetic flow valve 5 is installed on the ammonia gas delivery pipe 4.

[0039] Small stoker furnaces have narrow spaces and low flue gas flow rates. Spherical devices achieve efficient mixing in a small area through multi-directional injection, while reducing the size of the device and adapting to a compact layout. Ammonia injectors are distributed at multiple angles to maximize the use of limited space.

[0040] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0041] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A spherical ammonia injection device suitable for a small industrial boiler SCR denitration system, characterized in that, The application relates to a spherical ammonia injection buffer chamber (1) which is hollow inside, and a plurality of ammonia injectors (2) are arranged on the outer wall of the spherical ammonia injection buffer chamber (1) and communicate with the inner cavity of the spherical ammonia injection buffer chamber (1); the ammonia injectors (2) are arranged in a diverging manner on the outer surface of the spherical ammonia injection buffer chamber (1). The ammonia injector (2) comprises an ammonia injection pipe (21) and a rotating drive assembly (22); one end of the ammonia injection pipe (21) is fixed on the outer wall of the spherical ammonia injection buffer chamber (1), and a plurality of annularly arranged injection ports (211) are formed in the end face of the other end of the ammonia injection pipe (21); the rotating drive assembly (22) comprises a connecting shaft (221), a rotating body (222) and a spoiler blade (223); the connecting shaft (221) is detachably connected to the end face of the ammonia injection pipe (21) and is located on the inner side of the injection port (211); the rotating body (222) is rotationally connected to one end of the connecting shaft (221) which is away from the injection port (211); and the spoiler blade (223) is fixed on the outer wall of the rotating body (222); the spoiler blade (223) is rotated by the flue gas flow to disturb the mixing of ammonia and flue gas and prevent the injection port (211) from being blocked.

2. The spherical ammonia injection device suitable for the SCR denitration system of a small industrial boiler according to claim 1, characterized in that, An arc-shaped buffer plate (3) is arranged in the spherical ammonia injection buffer chamber (1).

3. The spherical ammonia injection device suitable for the SCR denitration system of a small industrial boiler according to claim 2, characterized in that, The arc-shaped buffer plate (3) is located in the spherical ammonia injection buffer chamber and is away from the direction of the flue gas flow.

4. The spherical ammonia injection device suitable for the SCR denitration system of a small industrial boiler according to claim 1, characterized in that, The connecting shaft (221) is screw-connected to the end face of the ammonia injection pipe (21).

5. The spherical ammonia injection device suitable for the SCR denitration system of small industrial boilers according to claim 1, characterized in that, The rotating body (222) is a impeller body, and the number of the spoiler blades (223) is multiple; the multiple spoiler blades (223) are annularly fixed on the side wall of the impeller body.

6. The spherical ammonia injection device suitable for the SCR denitration system of small industrial boilers according to claim 1, characterized in that, An ammonia delivery pipe (4) is further arranged, and the output end of the ammonia delivery pipe (4) communicates with the interior of the spherical ammonia injection buffer chamber (1).

7. The spherical ammonia injection device suitable for the SCR denitration system of small industrial boilers according to claim 6, characterized in that, The ammonia delivery pipe (4) is perpendicular to the direction of the flue gas flow.

8. The spherical ammonia injection device suitable for the SCR denitration system of small industrial boilers according to claim 7, characterized in that, An electromagnetic flow valve (5) is arranged on the ammonia delivery pipe (4).

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