Ammonia and flue gas efficient mixing device for sintering flue gas denitration

Abstract

The utility model provides a kind of ammonia gas and flue gas high-efficiency mixing device for sintering flue gas denitration, it is related to sintering process equipment field, including: main body, mixing cavity is set up in main body inside, gas inlet pipe is set up in the both sides of main body, gas inlet pipe gas inlet is located in main body lower end, the gas outlet of gas inlet pipe is located in mixing cavity upper end, exhaust pipe is set up in main body inside, the gas inlet of exhaust pipe is located in the bottom end of mixing cavity, the gas outlet of exhaust pipe is located in main body top end;Mixing assembly, mixing assembly is located in mixing cavity inside, for agitating airflow to improve mixing degree.This kind of device is formed by the circulating pipe of mixing assembly and fan active forced convection, traditional passive mixing is upgraded to dynamic circulation stirring, make ammonia gas and flue gas form multidirectional turbulent flow in mixing cavity, mixed uniformity improves, while cleaning assembly is automatically removed inner wall dust in equipment operation, can prevent the condition that device internal dust accumulation leads to device through-flow is poor occurs.

Description

Technical Field

[0001] This utility model relates to the field of sintering process equipment, specifically a high-efficiency mixing device for ammonia and flue gas in sintering flue gas denitrification. Background Technology

[0002] Sintering is a significant stage in steel production, generating substantial amounts of nitrogen oxides in its flue gas, a major source of air pollution. Selective catalytic reduction (SCR) technology has become the mainstream process for denitrification of sintering flue gas due to its high denitrification efficiency and stable operation. The core of this process lies in the uniform mixing of ammonia and flue gas; the mixing effect directly impacts the denitrification reaction efficiency and catalyst lifespan. However, sintering flue gas is characterized by large flow rates, high dust content, and wide temperature fluctuations. Traditional mixing devices struggle to achieve efficient mixing under these complex conditions, and dust easily accumulates on the inner walls of the equipment, leading to channel blockage, reduced mixing efficiency, and even equipment malfunctions.

[0003] Currently, the commonly used mixing devices in sintering flue gas denitrification systems mainly include pipeline mixers, static mixers, and simple nozzle injection structures. Pipeline mixers achieve mixing by creating turbulence in the airflow through the installation of guide vanes or bends.

[0004] However, the equipment commonly available on the market usually has the following defects. First, the common fixed turbulence solution is prone to dust accumulation and failure of the guide plate in high dust environments. Second, the static mixer relies on internal fixed components to divide the airflow. Although it can improve the mixing uniformity, the surface of the components is rough and easily becomes a dust adhesion point. Moreover, it cannot actively remove the dust accumulation and needs to be stopped regularly for manual disassembly and cleaning. Utility Model Content

[0005] The present invention aims to address the shortcomings of the prior art, such as the low mixing efficiency caused by common passive turbulence schemes in equipment, and to improve the problem of airflow obstruction caused by easy dust accumulation.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a high-efficiency mixing device for ammonia and flue gas in sintering flue gas denitrification, comprising: a main body, wherein a mixing chamber is provided inside the main body, and air inlet pipes are provided on both sides of the main body, with the air inlet of the air inlet pipe located at the lower end of the main body and the air outlet of the air inlet pipe located at the upper end of the mixing chamber; an exhaust pipe is provided inside the main body, with the air inlet of the exhaust pipe located at the bottom end of the mixing chamber and the air outlet of the exhaust pipe located at the top end of the main body; a mixing component, wherein the mixing component is disposed inside the mixing chamber for agitating the airflow to improve the mixing degree; and a cleaning component, wherein the cleaning component is disposed inside the mixing chamber for cleaning the interior of the mixing chamber.

[0007] Furthermore, the mixing assembly includes: a plurality of circulation pipes disposed on the inner wall of the mixing chamber; and an air passage opened inside the circulation pipes, wherein a fan is disposed inside the air passage.

[0008] Furthermore, the cleaning assembly includes: a cleaning platform disposed inside the mixing chamber, the cleaning platform having multiple receiving cavities inside, a cleaning plate slidably connected inside each receiving cavity, and multiple cleaning brushes disposed on one side of the cleaning plate; a threaded rod disposed inside the mixing chamber, the threaded rod being threadedly engaged with the cleaning platform; and an electric push rod disposed at the top of the mixing chamber, the bottom of the electric push rod being connected to a drive block, the top of the cleaning platform having an annular drive groove, and the drive block being slidably connected to the drive groove.

[0009] Furthermore, the circulation pipe is arranged in a semi-circular structure, with both the air inlet and outlet facing upwards.

[0010] Furthermore, a cleaning plate is provided inside the receiving cavity, and a traction spring is connected to one side of the cleaning plate and the inner wall of the receiving cavity.

[0011] Furthermore, the end of the cleaning brush is configured with a semi-circular structure.

[0012] Furthermore, the intake pipe, mixing chamber, and exhaust pipe are interconnected, and the outlet of the intake pipe is located above the intake of the exhaust pipe.

[0013] Furthermore, a control panel is provided on one side of the main body, and the control panel is electrically connected to the fan and the electric push rod respectively.

[0014] This invention provides a high-efficiency mixing device for ammonia and flue gas in sintering flue gas denitrification, which has the following advantages:

[0015] The advantages of this invention are that by forming active forced convection between the circulation pipe of the mixing component and the fan, the traditional passive mixing is upgraded to dynamic circulation stirring, which makes ammonia and flue gas form multi-directional turbulence in the mixing chamber, improving the mixing uniformity. At the same time, the cleaning component can prevent the accumulation of dust inside the device from causing poor flowability by automatically removing dust from the inner wall during the operation of the equipment. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0017] Figure 2 This is a cross-sectional view of the overall structure of this utility model.

[0018] Figure 3 This is a top view of the cleaning table structure of this utility model.

[0019] Figure 4 This is a schematic diagram of the circulation pipe structure of this utility model.

[0020] Figure 5 This is a schematic diagram of the cleaning table structure of this utility model.

[0021] Figure 6 For the present utility model Figure 2 A magnified schematic diagram of the structure at point A in the diagram.

[0022] Figure 1-6 In the middle: 100-Main body; 110-Intake pipe; 120-Mixing chamber; 130-Exhaust pipe; 140-Control panel; 200-Mixing assembly; 210-Circulation pipe; 220-Air passage; 230-Fan; 300-Cleaning assembly; 310-Cleaning platform; 311-Receiving chamber; 312-Cleaning plate; 313-Cleaning brush; 314-Traction spring; 315-Drive slot; 320-Threaded rod; 321-Electric push rod; 322-Drive block. Detailed Implementation

[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0024] The following disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0025] This application provides a high-efficiency mixing device for ammonia and flue gas in sintering flue gas denitrification. This device utilizes the circulation pipe of the mixing component and a fan to create active forced convection, upgrading traditional passive mixing to dynamic circulation and stirring. This results in multi-directional turbulence between the ammonia and flue gas within the mixing chamber, improving mixing uniformity. Simultaneously, a cleaning component automatically removes dust from the inner wall during operation, preventing dust accumulation and poor flowability. The following provides a detailed description of this high-efficiency mixing device for ammonia and flue gas in sintering flue gas denitrification. It should be noted that the order of description in the following embodiments is not intended to limit the preferred order of the embodiments.

[0026] The present application will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0027] Please see Figure 1-6 This embodiment provides a high-efficiency mixing device for ammonia and flue gas in sintering flue gas denitrification, comprising: a main body 100, a mixing chamber 120 inside the main body 100, air inlet pipes 110 on both sides of the main body 100, the air inlet of the air inlet pipe 110 being located at the lower end of the main body 100, the air outlet of the air inlet pipe 110 being located at the upper end of the mixing chamber 120, an exhaust pipe 130 inside the main body 100, the air inlet of the exhaust pipe 130 being located at the bottom end of the mixing chamber 120, and the air outlet of the exhaust pipe 130 being located at the top end of the main body 100; a mixing component 200, disposed inside the mixing chamber 120, used to agitate the airflow to improve the mixing degree; and a cleaning component 300, disposed inside the mixing chamber 120, used to clean the inside of the mixing chamber 120.

[0028] During use, external ammonia and flue gas flow in through the inlet of the inlet pipe 110 at the lower end of the main body 100, rise along the inlet pipe 110 to the outlet at the upper end of the mixing chamber 120, and flow downwards within the mixing chamber 120. The mixed gas enters through the inlet of the exhaust pipe 130 at the bottom of the mixing chamber 120 and exits through the exhaust pipe 130 from the outlet at the top of the main body 100. The outlet of the inlet pipe 110 is located at the upper end of the mixing chamber 120, allowing the gas to enter the mixing space in a "top-down" manner, forming convection with the "bottom-up" exhaust path of the exhaust pipe 130, thus prolonging the residence time of the gas in the mixing chamber 120. The internal flow channel layout of the main body 100 is reasonable, forming a unidirectional circulation path of "inlet-mixing-exhaust", avoiding airflow short-circuiting and providing a stable working space for the subsequent mixing component 200 and cleaning component 300. Furthermore, as the airflow passes through the mixing chamber 120, the mixing component 200 will guide the airflow to circulate and continuously agitate and mix it by flowing back and forth, thereby improving the mixing degree. During the mixing process, the cleaning component 300 can clean the dust deposited inside the mixing chamber 120 to prevent dust accumulation from affecting the airflow mixing.

[0029] Furthermore, the mixing component 200 includes: multiple circulation pipes 210 disposed on the inner wall of the mixing chamber 120; and an air passage 220 opened inside the circulation pipes 210. A fan 230 is installed inside the air passage 220. During use, after the fan 230 is started, it drives the air passage 220 in the circulation pipes 210 to form an airflow circulation: the gas in the mixing chamber 120 is drawn in from the air inlet of the circulation pipes 210, accelerated by the fan 230, flows along the air passage 220, and is discharged from the air outlet of the circulation pipes 210 to the upper end of the mixing chamber 120, continuously stirring the ammonia and flue gas in the mixing chamber. At this time, the circulation pipes 210 and the fan 230 form forced convection, breaking the laminar flow state of the gas, cutting the large airflow into small streams, significantly improving the mixing uniformity. At the same time, multiple sets of circulation pipes 210 are distributed on the inner wall of the mixing chamber 120, which can cover different areas and avoid mixing dead zones. It is suitable for high-flow, large-volume sintering flue gas denitrification scenarios.

[0030] Furthermore, the cleaning assembly 300 includes: a cleaning platform 310 disposed inside the mixing chamber 120, the cleaning platform 310 having multiple receiving cavities 311 inside, a cleaning plate 312 slidably connected inside the receiving cavities 311, and multiple cleaning brushes 313 disposed on one side of the cleaning plate 312; a threaded rod 320 disposed inside the mixing chamber 120, the threaded rod 320 being threadedly engaged with the cleaning platform 310; an electric push rod 321 disposed at the top of the mixing chamber 120, a drive block 322 connected to the bottom of the electric push rod 321, an annular drive groove 315 being formed at the top of the cleaning platform 310, and the drive block 322 being slidably connected to the drive groove 315;

[0031] During operation, the electric push rod 321 pushes the drive block 322 downwards, causing it to slide within the drive groove 315 at the top of the cleaning table 310. This drives the cleaning table 310 to rotate and move linearly along the threaded rod 320. As the cleaning table 310 moves, the cleaning brush 313 on the cleaning plate 312 contacts the inner wall of the mixing chamber 120, removing dust or crystals adhering to the wall surface. After cleaning, the electric push rod 321 resets, and the cleaning plate 312 retracts into the receiving cavity 311 under the action of the traction spring 314. The threaded rod 320 and the electric push rod 321 cooperate to realize the spiral reciprocating motion of the cleaning table 310, ensuring that the inner wall is cleaned without any omissions. The modular cleaning structure can automatically clean the equipment periodically during operation, avoiding manual downtime maintenance and improving the continuous operation capability of the device.

[0032] Furthermore, the circulation pipe 210 is designed with a semi-circular structure. Both the air inlet and outlet of the circulation pipe 210 face upwards. The air inlet of the circulation pipe 210 draws in the gas from the upper part of the mixing chamber 120. After being guided by the semi-circular pipe, the gas is discharged upwards from the outlet to the top of the mixing chamber 120, forming an airflow trajectory of "upward intake - arc-shaped circulation - upward discharge". This creates an orthogonal disturbance with the main airflow "from top to bottom" in the main body 100. This method can further enhance the mixing of materials.

[0033] Furthermore, a cleaning plate 312 is provided inside the receiving cavity 311. A traction spring 314 is connected to one side of the cleaning plate 312 and the inner wall of the receiving cavity 311. During use, when the cleaning table 310 moves, the cleaning plate 312 moves outward under the action of centrifugal force, overcoming the pulling force of the traction spring 314 and extending outward, so that the cleaning brush 313 fits tightly against the wall surface. When the cleaning table 310 stops moving, the traction spring 314 elastically resets and automatically retracts when stationary to prevent airflow from being obstructed by the cleaning brush 313.

[0034] Furthermore, the cleaning brush 313 has a semi-circular end. When the cleaning brush 313 moves with the cleaning plate 312, the semi-circular end first contacts the arc transition area of ​​the inner wall of the mixing chamber 120. Through the bending and deformation of the flexible bristles, in conjunction with the semi-circular end, the sharp edges are prevented from scratching the anti-corrosion coating of the inner wall, thus improving cleaning safety.

[0035] Furthermore, the intake pipe 110, mixing chamber 120, and exhaust pipe 130 are interconnected, and the outlet of the intake pipe 110 is located above the inlet of the exhaust pipe 130. The intake pipe 110, mixing chamber 120, and exhaust pipe 130 form a fully continuous flow channel: ammonia and flue gas are discharged from the upper end of the intake pipe 110 into the mixing chamber 120, and move downward under the action of gravity and airflow disturbance. After being fully mixed, they are drawn in from the bottom end of the exhaust pipe 130 and finally discharged from the top end. The outlet of the intake pipe 110 is higher than the inlet of the exhaust pipe 130. By utilizing the pressure difference effect of "high-level intake and low-level exhaust", natural gas convection is promoted, and the energy consumption of the fan is reduced.

[0036] Furthermore, a control panel 140 is provided on one side of the main body 100. The control panel 140 is electrically connected to the fan 230 and the electric push rod 321 respectively. The operator can input commands through the control panel 140 on one side of the main body 100 to control the speed of the fan 230 to adjust the mixing intensity and the start / stop and stroke control of the electric push rod 321 to control the cleaning frequency and range, thereby improving the ease of use of the device.

[0037] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0038] The above provides a detailed description of an efficient ammonia and flue gas mixing device for sintering flue gas denitrification provided in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A high-efficiency mixing device for ammonia and flue gas in sintering flue gas denitrification, characterized in that, include: The main body (100) has a mixing chamber (120) inside. Both sides of the main body (100) have air inlet pipes (110). The air inlet of the air inlet pipe (110) is located at the lower end of the main body (100), and the air outlet of the air inlet pipe (110) is located at the upper end of the mixing chamber (120). The main body (100) has an exhaust pipe (130) inside. The air inlet of the exhaust pipe (130) is located at the bottom end of the mixing chamber (120), and the air outlet of the exhaust pipe (130) is located at the top end of the main body (100). A mixing component (200) is disposed inside the mixing chamber (120) and is used to agitate the airflow to improve the mixing degree; A cleaning component (300) is disposed inside the mixing chamber (120) and is used to clean the inside of the mixing chamber (120).

2. The device for mixing ammonia gas and flue gas efficiently according to claim 1, characterized in that, The hybrid component (200) includes: Multiple circulation pipes (210) are provided on the inner wall of the mixing chamber (120); An air passage (220) is provided inside the circulation pipe (210), and a fan (230) is provided inside the air passage (220).

3. The device for mixing ammonia gas and flue gas efficiently according to claim 1, characterized in that, The cleaning component (300) includes: A cleaning platform (310) is provided inside the mixing chamber (120). The cleaning platform (310) has multiple receiving cavities (311) inside. A cleaning plate (312) is slidably connected inside the receiving cavity (311). Multiple cleaning brushes (313) are provided on one side of the cleaning plate (312). A threaded rod (320) is provided inside the mixing chamber (120), and the threaded rod (320) is threadedly engaged with the cleaning table (310); An electric push rod (321) is provided at the top of the mixing chamber (120), and a drive block (322) is connected to the bottom of the electric push rod (321). An annular drive groove (315) is provided at the top of the cleaning table (310), and the drive block (322) and the drive groove (315) are slidably connected.

4. The device for mixing ammonia gas and flue gas efficiently according to claim 2, characterized in that, The circulation pipe (210) is arranged in a semi-circular structure, and both the air inlet and the air outlet of the circulation pipe (210) are arranged facing upwards.

5. The device for mixing ammonia and flue gas according to claim 3, characterized in that, The cavity (311) is provided with a cleaning plate (312), and a traction spring (314) is connected to the inner wall of the cavity (311) on one side of the cleaning plate (312).

6. The device for mixing ammonia gas and flue gas efficiently according to claim 3, characterized in that, The cleaning brush (313) has a semi-circular structure at its end.

7. The device for mixing ammonia gas and flue gas efficiently according to claim 1, characterized in that, The intake pipe (110), mixing chamber (120) and exhaust pipe (130) are interconnected, and the outlet of the intake pipe (110) is located above the intake of the exhaust pipe (130).

8. The device for mixing ammonia gas and flue gas efficiently according to claim 2, characterized in that, The main body (100) is provided with a control panel (140) on one side, and the control panel (140) is electrically connected to the fan (230) and the electric push rod (321).

Images