Dual-channel flue gas mixing device for desulfurization and denitrification

Abstract

The utility model relates to environmental protection equipment technical field discloses a kind of double-channel flue gas mixing devices for desulfurization and denitrification, solve the problem that existing device mixing effect is poor, it is difficult to adapt to complex flue gas source;It includes main flue assembly, recirculation flue assembly, mixing cavity and mixing assembly: main flue and recirculation flue respectively transport two flue gas, after pretreatment by filter screen flange, into mixing cavity;Two groups of guide vanes in cavity are rotated by motor drive, form spiral disturbance, cooperate with the opposing flow field guided by arc deflector, and the uniformity of mixing is improved;Rectifier grid in output pipe mixes flue gas into laminar flow, and the reaction efficiency is improved after entering flue gas treatment tank;The inner wall of main, recirculation pipeline is provided with anticorrosive layer, the inner wall of mixing cavity has heat insulation layer, and the guide vane is covered with wear-resistant coating, which prolongs the service life of the equipment;Detachable flange design is convenient for maintenance, and the reliability of continuous operation is improved, and it is suitable for the desulfurization and denitrification demand of complex flue gas in thermal power generation, steel and other industries.

Description

Technical Field

[0001] This utility model relates to the field of environmental protection equipment technology, specifically a dual-channel flue gas mixing device for desulfurization and denitrification. Background Technology

[0002] Flue gas desulfurization and denitrification technologies are widely used in industrial emission control, such as in thermal power plants, steel mills, chemical plants, and waste incineration plants. Common flue gas treatment processes include wet desulfurization, dry desulfurization, and selective catalytic reduction (SCR) denitrification. These technologies typically require flue gas mixing devices to ensure sufficient contact between the reactants and the flue gas, thereby improving desulfurization and denitrification efficiency.

[0003] A search revealed existing technology (application number: CN113996178B), which describes "a flue gas mixing reaction device". This utility model includes a flue, a reagent injection assembly, and a mixing reaction assembly disposed between the injection assembly and the denitrification catalyst reactor. The mixing reaction assembly consists of a shell and several guide plates fixed to the inner wall.

[0004] However, although the existing technology rectifyes and disturbs the flue gas flow field through the guide plate to promote full contact between the reaction reagent and the flue gas pollutants, it still has some shortcomings: its guide plate adopts a static fixed structure, which makes it difficult to adjust the airflow direction and disturbance intensity, which may lead to a decrease in the mixing effect; in addition, the device does not fully consider the problem of uneven initial distribution of multiple flue gas streams before entering the mixing zone, lacks the ability to coordinate and control dual-channel flue gas sources, and has certain limitations in meeting the high-efficiency mixing requirements under complex flue gas sources. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a dual-channel flue gas mixing device for desulfurization and denitrification.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a dual-channel flue gas mixing device for desulfurization and denitrification, comprising: a main flue gas duct assembly: including a main flue gas pipe for conveying main flue gas; a recirculation flue gas duct assembly: including a recirculation flue gas pipe disposed on one side of the main flue gas pipe for conveying recirculated flue gas; a cavity assembly: including a mixing cavity disposed between the main flue gas pipe and the recirculation flue gas pipe; an output assembly: including an output pipe fixedly connected to the bottom of one side of the mixing cavity for outputting the mixed gas; a flue gas treatment tank fixedly connected to the end of the output pipe away from the mixing cavity for subsequent desulfurization and denitrification treatment of the mixed gas; and a mixing assembly: including guide vanes disposed inside the mixing cavity, and having two sets for promoting the mixing of flue gas.

[0007] As a further description of the above technical solution:

[0008] The main flue assembly also includes: the main flue pipe having a first air inlet and a first air outlet; a filter flange, located at the first air inlet of the main flue pipe, for pre-treating the main flue gas; and a connecting flange, located at the first air outlet of the main flue pipe, for detachable connection with an external main flue gas pipeline.

[0009] As a further description of the above technical solution:

[0010] The recirculation flue assembly also includes: the recirculation flue pipe having a second air inlet and a second air outlet; a second filter flange, located at the second air inlet of the recirculation flue pipe, for pre-treating the recirculated flue gas; and a second connecting flange, located at the first air outlet of the recirculation flue pipe, for detachable connection with an external recirculation flue gas pipeline.

[0011] As a further description of the above technical solution:

[0012] The cavity assembly also includes: a baffle plate, which is bolted to the inner wall of the main flue gas duct to guide the flow of flue gas; a third air inlet, which is fixedly installed through the mixing cavity on the side near the main flue gas duct and connected to the main flue gas duct via a flange, for delivering main flue gas into the mixing cavity; and a fourth air inlet, which is fixedly installed through the mixing cavity on the side near the recirculation flue gas duct and connected to the recirculation flue gas duct via a flange, for delivering recirculated flue gas into the mixing cavity.

[0013] As a further description of the above technical solution:

[0014] The output assembly also includes a rectifier grille, which is fixed inside the output pipe near the mixing chamber and includes multiple parallel grille bars for further rectifying the mixed flue gas.

[0015] As a further description of the above technical solution:

[0016] The mixing assembly also includes: a central rotating shaft, fixed between two sets of guide vanes, used to drive the guide vanes to rotate; and a motor, fixed to the top of the mixing chamber, with its output end connected to the central rotating shaft via a coupling, and the output end rotating through the mixing chamber, used to drive the central rotating shaft to rotate.

[0017] As a further description of the above technical solution:

[0018] The cross-sectional shape of the guide plate is arc-shaped; the surface of the guide blade is provided with a wear-resistant coating; the inner wall of the mixing chamber is provided with a heat insulation layer; the inner walls of the main smoke duct and the recirculation smoke duct are both provided with an anti-corrosion layer.

[0019] This utility model has the following beneficial effects:

[0020] 1. Two sets of guide vanes within the mixing chamber rotate via a central shaft driven by a motor, creating a spiral airflow disturbance. This allows the main flue gas and recirculated flue gas to achieve turbulent mixing within the chamber, improving mixing uniformity compared to traditional static mixing methods. An arc-shaped guide plate guides the main flue gas along a preset path into the mixing chamber, forming an opposing flow field with the recirculated flue gas. This, combined with the fourth air inlet, further enhances the airflow disturbance. The rectifier grid within the output pipe uses parallel grid bars to organize the mixed flue gas into a laminar flow state, ensuring uniform gas distribution upon entering the flue gas treatment tank. This improves the efficiency of desulfurization and denitrification reactions, mitigating the problems of reagent waste and incomplete treatment caused by uneven mixing.

[0021] 2. Filter flange one and filter flange two are respectively installed at the air inlets of the main flue and the recirculation flue to intercept particulate matter in the flue gas and reduce wear on subsequent mixing components and treatment tanks; the anti-corrosion layer on the inner wall of the main flue and the recirculation flue can withstand flue gas corrosion, the heat insulation layer on the inner wall of the mixing chamber reduces the temperature of the outer wall, and the wear-resistant coating on the surface of the guide vanes extends the service life of the vanes; the detachable connection flange design facilitates regular cleaning and maintenance, and the continuous operation reliability of the entire unit is improved compared with the traditional integrated structure, making it suitable for long-term high-load flue gas treatment scenarios. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of a dual-channel flue gas mixing device for desulfurization and denitrification proposed in this utility model;

[0023] Figure 2 This is a partial structural cross-sectional view of a dual-channel flue gas mixing device for desulfurization and denitrification proposed in this utility model;

[0024] Figure 3 This is a partial structural diagram of a dual-channel flue gas mixing device for desulfurization and denitrification proposed in this utility model. Figure 1 ;

[0025] Figure 4 This is a partial structural diagram of a dual-channel flue gas mixing device for desulfurization and denitrification proposed in this utility model. Figure 2 ;

[0026] Legend:

[0027] 101. Main flue; 102. Filter flange one; 103. Connecting flange one; 201. Recirculating flue; 202. Filter flange two; 203. Connecting flange two; 301. Mixing chamber; 302. Baffle plate; 303. Third air inlet; 304. Fourth air inlet; 401. Output pipe; 402. Rectifying grille; 5. Flue gas treatment tank; 601. Guide vane; 602. Central rotating shaft; 603. Motor. Detailed Implementation

[0028] 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.

[0029] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The utility model will be further described in detail below with reference to the accompanying drawings.

[0030] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," 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 or an electrical connection; 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] Example 1:

[0032] like Figures 1 to 4 As shown in the figure, this embodiment provides a dual-channel flue gas mixing device for desulfurization and denitrification, comprising: a main flue assembly including a main flue pipe 101 for conveying main flue gas; a recirculation flue assembly including a recirculation flue pipe 201 disposed on one side of the main flue pipe 101 for conveying recirculated flue gas; a cavity assembly including a mixing cavity 301 disposed between the main flue pipe 101 and the recirculation flue pipe 201; an output assembly including an output pipe 401 fixedly connected to the bottom of one side of the mixing cavity 301 for outputting the mixed gas; a flue gas treatment tank 5 fixedly connected to the end of the output pipe 401 away from the mixing cavity 301 for subsequent desulfurization and denitrification treatment of the mixed gas; and a mixing assembly including guide vanes 601 disposed inside the mixing cavity 301, and having two sets for promoting the mixing of flue gas.

[0033] In this embodiment, the cavity assembly and the mixing assembly constitute a dual-channel flue gas mixing device for desulfurization and denitrification according to this application.

[0034] It should also be noted that the dual-channel flue gas mixing device in this application refers to a flue gas mixing device for desulfurization and denitrification.

[0035] Specifically, the main flue assembly also includes: the main flue duct 101 is provided with a first air inlet and a first air outlet; a filter flange 102 is provided at the first air inlet of the main flue duct 101 for pre-treating the main flue gas; and a connecting flange 103 is provided at the first air outlet of the main flue duct 101 for detachable connection with an external main flue gas pipeline.

[0036] In this embodiment, the filter flange 102 filters impurities in the main flue gas, and the connecting flange 103 connects the main flue gas duct 101 to the external pipeline; the main flue gas is purified, which facilitates the installation and disassembly of the main flue gas duct 101.

[0037] Specifically, the recirculation flue assembly also includes: the recirculation flue duct 201 is provided with a second air inlet and a second air outlet; a filter flange 202 is provided at the second air inlet of the recirculation flue duct 201 for pre-treating the recirculated flue gas; and a connecting flange 203 is provided at the first air outlet of the recirculation flue duct 201 for detachable connection with an external recirculation flue gas pipeline.

[0038] As a preferred implementation, filter flange 202 filters impurities in the recirculated flue gas, and connecting flange 203 connects the recirculated flue gas duct 201 to the external pipeline; the recirculated flue gas is purified, and the recirculated flue gas duct 201 is easy to install and disassemble.

[0039] Example 2:

[0040] Based on Example 1, in order to further improve the mixing efficiency, a cavity assembly is arranged between the main smoke duct 101 and the recirculation smoke duct 201;

[0041] Specifically, the cavity assembly also includes: a guide plate 302, which is bolted to the inner wall of the main flue duct 101 to guide the flow of flue gas; a third air inlet 303, which is fixedly installed in the mixing cavity 301 near the main flue duct 101 and connected to the main flue duct 101 via a flange, for conveying the main flue gas into the mixing cavity 301; and a fourth air inlet 304, which is fixedly installed in the mixing cavity 301 near the recirculation flue duct 201 and connected to the recirculation flue duct 201 via a flange, for conveying recirculated flue gas into the mixing cavity 301.

[0042] In this embodiment, the guide plate 302 guides the main flue gas flow to the third air inlet 303, and the main flue gas and the recirculated flue gas enter the mixing chamber 301 through the third and fourth air inlets respectively; the flue gas flow path is optimized to ensure that the two flue gases enter the mixing chamber 301 stably.

[0043] Specifically, the output component also includes: a rectifier grille 402, which is fixed inside the output pipe 401 near the mixing chamber 301 and includes multiple parallel grille bars for further rectifying the mixed flue gas.

[0044] With this configuration, when the mixed flue gas passes through the rectifier grille 402, the grille bars smooth the airflow, making the flue gas flow uniform; reducing the turbulence of the mixed flue gas, and ensuring the stability of the airflow entering the flue gas treatment tank 5.

[0045] Example 3:

[0046] Based on Example 2, in order to further improve the mixing efficiency, a mixing component is arranged inside the mixing cavity 301;

[0047] Specifically, the mixing assembly also includes: a central rotating shaft 602, which is fixed between two sets of guide vanes 601 and is used to drive the guide vanes 601 to rotate; and a motor 603, which is fixed to the top of the mixing chamber 301 and whose output end is connected to the central rotating shaft 602 through a coupling and whose output end rotates through the mixing chamber 301, and is used to drive the central rotating shaft 602 to rotate.

[0048] Among them, the motor 603 drives the central shaft 602 to rotate, which in turn drives the guide vane 601 to rotate, stirring the flue gas in the mixing chamber 301; thus enhancing the mixing effect of the two flue gases and improving the mixing uniformity.

[0049] Specifically, the cross-sectional shape of the guide plate 302 is arc-shaped; the surface of the guide blade 601 is provided with a wear-resistant coating; the inner wall of the mixing chamber 301 is provided with a heat insulation layer; and the inner walls of the main smoke duct 101 and the recirculation smoke duct 201 are both provided with an anti-corrosion layer.

[0050] In this embodiment, the radius of curvature of the arc is 100mm, which reduces resistance during airflow while ensuring sufficient rigidity of the diverter plate to withstand the impact of high-speed airflow; the thickness of the wear-resistant coating is 0.3mm, and the material is tungsten carbide coating, which effectively extends the service life of the guide vanes while ensuring good wear resistance without significantly increasing the weight of the guide vanes; the thickness of the heat insulation layer is 20mm, and the material is ceramic fiber, which effectively reduces the heat conduction of high-temperature flue gas to the outer wall of the mixing chamber, while ensuring good heat insulation performance without significantly increasing the overall size of the mixing chamber; the thickness of the anti-corrosion layer is 0.6mm, and the material is epoxy resin, which effectively prevents corrosive substances in the flue gas from eroding the inner wall of the flue, while ensuring good anti-corrosion performance without significantly increasing the weight of the flue.

[0051] In actual use, motor 603 is first turned on; the main flue gas enters the main flue duct 101 through the first inlet, is initially filtered by filter flange 102 to remove impurities, and then flows into the mixing chamber 301 through the first outlet to the third inlet 303; the recirculated flue gas enters the recirculated flue duct 201 through the second inlet, is initially filtered by filter flange 202 to remove impurities, and then flows into the mixing chamber 301 through the second outlet to the fourth inlet 304; the two flue gases enter... After entering the mixing chamber 301, the flue gas is first guided by the guide plate 302, so that the main flue gas and the recirculated flue gas can be evenly distributed when entering the mixing chamber 301. Then, the two flue gas enters the area where the guide vane 601 is located. The motor 603 drives the guide vane 601 to rotate, thereby changing the airflow direction and turbulence intensity, promoting the full mixing of the main flue gas and the recirculated flue gas. Finally, the mixed flue gas is rectified by the rectifier grille 402 to reduce airflow turbulence, and is discharged from the output pipe 401 into the flue gas treatment tank 5 for further treatment.

[0052] It should be noted that all electrical components mentioned in this article are connected to an external main controller and 220V AC mains power. The main controller can be a conventional known device that can be controlled by a computer or other means. The detailed description of known functions and known components is omitted in the specific implementation of this disclosure. In order to ensure the compatibility of the device, the operating methods used are consistent with the parameters of commercially available instruments.

[0053] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A dual-channel flue gas mixing device for desulfurization and denitrification, characterized in that: Main flue assembly: includes main flue duct (101) for conveying main flue gas; Recirculation flue assembly: includes a recirculation flue (201), which is located on one side of the main flue (101) and is used to transport recirculated flue gas; Cavity assembly: includes a mixing cavity (301) disposed between the main smoke duct (101) and the recirculation smoke duct (201); Output component: includes an output tube (401), which is fixed to the bottom of one side of the mixing chamber (301) for outputting the mixed gas; The flue gas treatment tank (5) is fixed to the end of the output pipe (401) away from the mixing chamber (301) and is used to perform subsequent desulfurization and denitrification treatment on the mixed gas. Mixing assembly: includes guide vanes (601) disposed inside the mixing chamber (301), and two sets are provided to promote the mixing of flue gas.

2. The dual-channel flue gas mixing device for desulfurization and denitrification according to claim 1, characterized in that: The main flue assembly also includes: The main flue (101) is provided with a first air inlet and a first air outlet; Filter flange 1 (102) is installed at the first air inlet of the main flue gas duct (101) and is used to pre-treat the main flue gas; Connecting flange 1 (103) is located at the first outlet of the main flue gas duct (101) and is used for detachable connection with the external main flue gas duct.

3. The dual-channel flue gas mixing device for desulfurization and denitrification according to claim 2, characterized in that: The recirculation flue assembly also includes: The recirculating flue (201) is provided with a second air inlet and a second air outlet; The filter flange 2 (202) is installed at the second air inlet of the recirculation flue gas duct (201) and is used to pre-treat the recirculation flue gas. Connecting flange 2 (203) is located at the first outlet of the recirculation flue gas duct (201) and is used for detachable connection with the external recirculation flue gas duct.

4. The dual-channel flue gas mixing device for desulfurization and denitrification according to claim 3, characterized in that: The cavity assembly also includes: The guide plate (302) is bolted to the inner wall of the main flue (101) to guide the flow of flue gas; The third air inlet (303) is fixedly installed in the mixing chamber (301) on the side near the main flue gas duct (101) and is connected to the main flue gas duct (101) through a flange, and is used to deliver the main flue gas into the mixing chamber (301); The fourth air inlet (304) is fixedly installed in the mixing chamber (301) on the side near the recirculation flue (201) and is connected to the recirculation flue (201) through a flange, for conveying recirculated flue gas into the mixing chamber (301).

5. A dual-channel flue gas mixing device for desulfurization and denitrification according to claim 4, characterized in that: The output assembly also includes a rectifier grille (402), which is fixed inside the output pipe (401) near the mixing chamber (301) and includes multiple parallel grille bars for further rectifying the mixed flue gas.

6. The dual-channel flue gas mixing device for desulfurization and denitrification according to claim 5, characterized in that: The hybrid components also include: The central rotating shaft (602) is fixed between the two sets of guide vanes (601) and is used to drive the guide vanes (601) to rotate. The motor (603) is fixed to the top of the mixing chamber (301), and its output end is connected to the central rotating shaft (602) through a coupling. The output end rotates through the mixing chamber (301) to drive the central rotating shaft (602) to rotate.

7. A dual-channel flue gas mixing device for desulfurization and denitrification according to claim 6, characterized in that: The cross-sectional shape of the guide plate (302) is arc-shaped; The surface of the guide vane (601) is provided with a wear-resistant coating; The inner wall of the mixing chamber (301) is provided with a heat insulation layer; The inner walls of both the main flue (101) and the recirculating flue (201) are provided with anti-corrosion layers.

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