A mud spraying device for desulfurization absorption tower of CFB boiler

Abstract

This utility model belongs to the field of desulfurization technology, and specifically relates to a slurry spraying device for a CFB boiler desulfurization absorption tower. It includes a spraying mechanism and a flue gas distribution mechanism, with the latter located below the spraying mechanism. The flue gas distribution mechanism includes a perforated plate and a gas distribution hood, with the hood positioned at the center of the perforated plate. The outer diameter of the gas distribution hood is smaller than the outer diameter of the perforated plate, and the hood communicates with the holes on the perforated plate. The hood also has several ventilation holes. The spraying mechanism includes a liquid supply pipe and spray pipes, each with nozzles. The spray pipes are spaced circumferentially along the gas distribution hood, with one end connected to the liquid supply pipe and the other end extending to the edge of the perforated plate. This slurry spraying device for a CFB boiler desulfurization absorption tower ensures that the flue gas can more fully contact the slurry sprayed from the nozzles of the spray pipes, thus improving the overall desulfurization effect and uniformity of the slurry spraying device.

Description

Technical Field

[0001] This utility model belongs to the field of desulfurization technology, and in particular relates to a mud spraying device for a CFB boiler desulfurization absorption tower. Background Technology

[0002] Sulfur dioxide is produced during the combustion process of circulating fluidized bed boilers. To control emissions, a desulfurization absorption tower is usually installed at the rear, with multiple layers of slurry spraying equipment arranged inside. The spraying equipment atomizes the desulfurizing agent slurry into droplets, which come into countercurrent contact with the upward flue gas. Through the adsorption, dissolution, and chemical reaction of sulfur dioxide by the droplets, desulfurization and purification are achieved. At the same time, the droplets also have a capturing effect on some dust in the flue gas. Therefore, the spraying equipment is the core component of the absorption tower.

[0003] Currently, most absorption towers employ a method of uniformly arranging nozzles across the tower's cross-section, with nozzle density and diameter remaining consistent across layers. The slurry coverage area is designed according to conventional flue gas flow field principles. However, in actual operation, due to the uneven distribution of flue gas flow, high-speed airflow often occurs near the tower center or in localized areas. These areas experience short flue gas residence times and insufficient contact between the slurry and flue gas, leading to decreased desulfurization efficiency and fluctuations in outlet sulfur dioxide concentration. Furthermore, the high-speed airflow can carry droplets, exacerbating the demister load and creating a "gypsum rain" phenomenon. Existing spraying equipment lacks targeted enhanced spraying in high-speed airflow areas, resulting in poor desulfurization absorption efficiency and uniformity. Utility Model Content

[0004] In view of this, the present invention aims to propose a mud spraying device for a CFB boiler desulfurization absorption tower, so as to solve the problems of poor desulfurization absorption effect and uniformity of existing spraying devices.

[0005] A mud spraying device for a CFB boiler desulfurization absorption tower includes a spraying mechanism and a flue gas distribution mechanism, wherein the flue gas distribution mechanism is located below the spraying mechanism. The flue gas distribution mechanism includes a perforated plate and a gas distribution hood, wherein the gas distribution hood is disposed at the center of the perforated plate, the outer diameter of the gas distribution hood is smaller than the outer diameter of the perforated plate, the gas distribution hood communicates with the holes on the perforated plate, and the gas distribution hood is provided with a plurality of vent holes. The spraying mechanism includes a liquid supply pipe and a spray pipe, wherein the spray pipe is provided with nozzles, and the spray pipes are spaced apart circumferentially along the gas distribution hood. Each spray pipe has one end connected to the liquid supply pipe and the other end extending to the edge of the perforated plate.

[0006] Furthermore, the air distribution hood is conical, and the large-diameter end of the air distribution hood is fixed to the perforated plate.

[0007] Furthermore, the spray pipe includes an inclined portion and a horizontal portion, the inclined portion being arranged parallel to the outer wall of the air distribution hood, and the horizontal portion being arranged parallel to the perforated plate.

[0008] Furthermore, the vent is a strip-shaped hole, and the length direction of each vent is the same as the generatrix direction of the air distribution hood.

[0009] Furthermore, the vents are spaced apart along the generatrix of the air distribution hood.

[0010] Furthermore, a liquid collection groove is provided on the air distribution hood at the position between two adjacent air vents, and the length direction of the liquid collection groove is the same as the generatrix direction of the air distribution hood.

[0011] Furthermore, the porous plate is provided with a liquid guiding groove, one end of which is connected to the liquid collecting groove, and the other end extends toward the middle of the porous plate. The liquid guiding groove is connected to the holes on the porous plate.

[0012] Furthermore, the perforated plate is provided with a baffle at its edge. The baffle is an annular structure. There is a liquid collection gap between the inner wall of the baffle and the outer wall of the air distribution hood. The liquid collection gap is connected to the holes on the perforated plate.

[0013] Furthermore, the nozzle is a spiral hollow cone nozzle.

[0014] To achieve the above objectives, the technical solution of this utility model is implemented as follows: Compared with existing technologies, the mud spraying equipment for CFB boiler desulfurization absorption towers described in this utility model has the following advantages: This utility model describes a mud spraying device for a CFB boiler desulfurization absorption tower. By arranging a gas distribution hood in the middle of a perforated plate and installing several ventilation holes on the hood, it effectively slows down the high-speed flue gas in areas with uneven flue gas flow distribution and high-speed airflow near the tower center or in localized areas. The perforated plate first intercepts and disperses the high-speed flue gas in the center or localized areas, while the gas distribution hood further intercepts and disperses the high-speed flue gas in the center, guiding it outwards and extending its flow path within the tower. This further reduces the flue gas velocity and improves the uniformity of gas dispersion, ensuring more thorough contact between the flue gas and the mud sprayed from the nozzles. This improves the overall desulfurization effect and uniformity of the mud spraying device. Attached Figure Description

[0015] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings: Figure 1This is a schematic diagram of the structure of a mud spraying device for a CFB boiler desulfurization absorption tower according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the perforated plate in a mud spraying device for a CFB boiler desulfurization absorption tower according to an embodiment of the present invention.

[0016] Explanation of reference numerals in the attached figures: 1. Perforated plate; 2. Air distribution hood; 3. Liquid supply pipe; 4. Spray pipe; 5. Inclined section; 6. Horizontal section; 7. Nozzle; 8. Baffle; 9. Liquid collection tank; 10. Vent hole; 11. Liquid guide tank. Detailed Implementation

[0017] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0018] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, 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," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0019] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0020] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0021] This utility model embodiment provides a mud spraying device for a CFB boiler desulfurization absorption tower, such as... Figure 1 and Figure 2As shown, the system includes a spraying mechanism and a flue gas distribution mechanism, with the flue gas distribution mechanism located below the spraying mechanism. The flue gas distribution mechanism includes a perforated plate 1 and a gas distribution hood 2. The gas distribution hood 2 is positioned at the center of the perforated plate 1, and its outer diameter is smaller than that of the perforated plate 1. The gas distribution hood 2 communicates with the holes on the perforated plate 1, and it has several ventilation holes 10. The spraying mechanism includes a liquid supply pipe 3 and a spray pipe 4. The spray pipe 4 has nozzles 7 and is spaced apart along the circumference of the gas distribution hood 2. Each spray pipe 4 has one end connected to the liquid supply pipe 3 and the other end extending to the edge of the perforated plate 1.

[0022] In this embodiment, both the spraying mechanism and the flue gas distribution mechanism need to be installed inside the absorption tower. After installation, it is necessary to ensure that the flue gas distribution mechanism is located below the spraying mechanism and that the gas distribution hood 2 is located in the center of the absorption tower. This allows the flue gas to be dispersed and evenly distributed through the flue gas distribution mechanism during its ascent, and allows the flue gas to pass through the spraying mechanism in a more dispersed manner, thereby improving the desulfurization effect and efficiency of the spraying mechanism on the flue gas.

[0023] Using the above configuration, a gas distribution hood 2 is arranged in the middle of the perforated plate 1, and several ventilation holes 10 are arranged on the gas distribution hood 2. In view of the uneven distribution of flue gas flow and the high-speed airflow that often occurs near the center of the tower or in local areas, the perforated plate 1 and the gas distribution hood 2 can effectively slow down the high-speed flue gas in the center of the tower or in local areas. The perforated plate 1 can first intercept and disperse the high-speed flue gas in the center of the tower or in local areas, so that the high-speed airflow is dispersed. The gas distribution hood 2 can further intercept and disperse the high-speed flue gas in the center of the tower, guide the flue gas in the center of the tower to the surrounding areas of the tower, extend the flow path of the flue gas in the tower, thereby further reducing the flow velocity of the flue gas and improving the uniformity of flue gas dispersion. This ensures that the flue gas can come into more full contact with the slurry sprayed from the nozzles 7 of the spray pipe 4, which is beneficial to improving the overall spray desulfurization effect and desulfurization uniformity of this slurry spraying equipment.

[0024] In a preferred embodiment of this example, the air distribution hood 2 is conical, and the large-diameter end of the air distribution hood 2 is fixed on the perforated plate 1.

[0025] Specifically, the vents 10 are located on the outer wall of the gas distribution hood 2, allowing the flue gas entering the gas distribution hood 2 from the holes in the perforated plate 1 to be dispersed and distributed to the outside of the gas distribution hood 2 through the vents 10. Simultaneously, since the large-diameter end of the gas distribution hood 2 is fixed to the perforated plate 1, some of the vents 10 on the outer wall of the gas distribution hood 2 are aligned with the holes in the perforated plate 1, allowing the flue gas passing through the perforated plate 1 to flow directly upwards through these vents 10. This helps reduce the obstruction of the flue gas flow by the gas distribution hood 2 and improves the smoothness of the flue gas flow.

[0026] Using the above-mentioned setup, the conical gas distribution hood 2 not only improves the dispersion effect of the gas distribution hood 2 on the flue gas, but also prevents the gas distribution hood 2 from causing too much obstruction to the flue gas flow. The flue gas can always pass through the perforated plate 1 and the gas distribution hood 2 stably and smoothly, ensuring the stability of the flue gas flow. This is conducive to improving the stable contact between the slurry sprayed from the nozzle of the spray pipe 4 and the flue gas to achieve desulfurization absorption.

[0027] In a preferred embodiment of this example, the spray pipe 4 includes an inclined portion 5 and a horizontal portion 6. The inclined portion 5 is arranged parallel to the outer wall of the air distribution hood 2, and the horizontal portion 6 is arranged parallel to the perforated plate 1.

[0028] Specifically, three, four, or more spray pipes 4 are evenly arranged around the circumference of the gas distribution hood 2. Each spray pipe 4 is fixed with multiple nozzles 7, and each nozzle 7 is connected to the spray pipe 4. The spray pipe 4 is connected to the liquid supply pipe 3 to achieve stable liquid supply. By evenly arranging multiple spray pipes 4, the slurry sprayed from the nozzles 7 of the multiple spray pipes 4 can form a dense and uniform slurry water curtain around the outer circumference of the gas distribution hood 2 and above the perforated plate 1. During the rising process of the flue gas, it can fully contact the slurry, allowing the slurry to adsorb the sulfides in the flue gas.

[0029] Using the above-mentioned configuration, the inclined part on the spray pipe 4 can not only be set close to the outer wall of the gas distribution hood 2, thus ensuring that the mud sprayed from the nozzle 7 can effectively contact the flue gas discharged from the vent 10, but also the horizontal part 6 can be set closer to the perforated plate 1, ensuring that the flue gas discharged through the holes of the perforated plate 1 can also fully contact the mud sprayed from the nozzle 7, which is conducive to further improving the overall desulfurization absorption effect and uniformity of this mud spraying equipment.

[0030] In a preferred embodiment of this example, the vent 10 is a strip-shaped hole, and the length direction of each vent 10 is the same as the generatrix direction of the air distribution cover 2.

[0031] Using the above-described configuration, the strip-shaped holes have a relatively long length. Especially when arranged along the generatrix of the gas distribution hood 2, one vent 10 can cover multiple holes on the perforated plate 1. Some holes on the perforated plate 1 can also overlap with the vent 10, allowing the flue gas to flow directly upwards. Other holes may be blocked by the inner wall of the gas distribution hood 2. During the upward movement of the flue gas, its flow direction changes due to collision with the inner wall of the gas distribution hood 2, and it eventually flows outwards through the vent 10. This achieves the effect of reducing the flow velocity of the flue gas, which is beneficial to improving the contact effect between the flue gas and the slurry sprayed from the nozzle 7.

[0032] In a preferred embodiment of this example, the vents 10 are spaced apart along the generatrix direction of the air distribution hood 2.

[0033] Specifically, multiple sets of vent holes 10 can be evenly arranged around the circumference of the gas distribution hood 2, with each set of vent holes 10 spaced apart along the generatrix of the gas distribution hood 2. By arranging multiple vent holes 10 spaced apart along the generatrix of the gas distribution hood 2, it is beneficial to further disperse the flue gas, improve the uniformity of flue gas flow, and prevent high-speed flue gas from concentrating at a certain vent hole 10. This results in a more consistent flue gas flow velocity discharged through the vent holes 10 of the gas distribution hood 2, thereby improving the spray desulfurization effect of the slurry sprayed by the nozzle 7 on the entire flue gas flow.

[0034] In a preferred embodiment of this invention, a liquid collection groove 9 is provided on the air distribution cover 2 at a position corresponding to the position between two adjacent air vents 10, and the length direction of the liquid collection groove 9 is the same as the generatrix direction of the air distribution cover 2.

[0035] Specifically, the liquid collection tank 9 can be a recess on the outer wall surface of the air distribution hood 2, and one or more liquid collection tanks 9 can be provided between two adjacent sets of air vents 10.

[0036] Using the above-mentioned setup, by setting a liquid collection tank 9 on the outer wall of the gas distribution hood 2 with the same direction as its generatrix, when the slurry sprayed from the nozzle 7 comes into full contact with the flue gas, it will splash onto the outer wall of the gas distribution hood 2. As the slurry continues to spray, it will gather in the liquid collection tank 9 and flow down. At this time, the liquid collection tank 9 can play a good role in gathering the slurry, guiding the slurry to gather quickly and flow down, avoiding the slurry from staying on the gas distribution hood 2 for a long time, reducing the possibility of the slurry blocking the ventilation hole 10, and helping to ensure the stability of the flue gas flow.

[0037] In a preferred embodiment of this example, a liquid guiding groove 11 is provided on the porous plate 1. One end of the liquid guiding groove 11 is connected to the liquid collecting groove 9, and the other end extends toward the middle of the porous plate 1. The liquid guiding groove 11 is connected to the holes on the porous plate 1.

[0038] Specifically, the liquid guiding channel 11 and the liquid collecting channel 9 are set up one-to-one. By setting the liquid guiding channel 11 on the perforated plate 1, the liquid guiding channel 11 can not only collect the mud on the surface of the perforated plate 1, but also guide the mud flowing down from the liquid collecting channel 9 to the middle of the perforated plate 1, and make the mud fall through the holes in the middle of the perforated plate 1. In this way, the mud can not only play a certain role in sealing the holes of the perforated plate 1 in the center of the tower, reducing the flue gas velocity through these holes, and driving the flue gas to flow around the perforated plate 1, improving the uniformity of flue gas passing through the perforated plate 1, thereby improving the uniformity of desulfurization absorption; moreover, the mud flowing down through the guiding channel and the holes of the perforated plate 1 can also contact the flue gas, realizing the pre-desulfurization absorption of the flue gas entering the gas distribution hood 2, so that the high-speed flue gas in the center of the tower can improve the desulfurization effect under the two desulfurization absorptions of the mud.

[0039] In a preferred embodiment of this example, a baffle 8 is provided at the edge of the perforated plate 1. The baffle 8 is an annular structure. There is a liquid collection gap between the inner wall of the baffle 8 and the outer wall of the air distribution hood 2. The liquid collection gap is connected to the holes on the perforated plate 1.

[0040] Specifically, the perforated plate 1 is circular, and the perforated plate 1, baffle 8 and gas distribution hood 2 are arranged coaxially, with the gas distribution hood 2 located at the center of the tower.

[0041] Using the above configuration, the baffle 8 can effectively collect the slurry sprayed from the nozzle 7 of the spray pipe 4, allowing the slurry to accumulate in the liquid collection gap and eventually flow down through the holes of the perforated plate 1. The flowing slurry can also play a certain role in desulfurization absorption of the flue gas that has not yet passed through the perforated plate 1.

[0042] In a preferred embodiment of this example, nozzle 7 is a spiral hollow cone nozzle.

[0043] Specifically, the nozzle 7 and the spray pipe 4 are fixedly connected, for example by threaded connection or welding.

[0044] Using the above-described configuration, the spiral hollow cone nozzle 7 serves as the nozzle 7 of the spray pipe 4. Its unique spiral groove structure offers significant technical advantages. Liquid enters tangentially along the spiral groove, forming an annular liquid film under centrifugal force. Upon exiting the nozzle, the film instantly breaks into a cluster of fine and uniform droplets. The atomized particle size is typically between 50 and 200 micrometers, with a narrow distribution range, significantly improving gas-liquid contact efficiency. This makes it particularly suitable for processes with limited mass transfer, such as desulfurization, cooling, and dust removal. Structurally, the spiral hollow cone nozzle 7 is typically a one-piece molded design without internal inserts, simplifying manufacturing and maintenance. It can be directly replaced as a whole after wear without adjustment. Combined with wear-resistant and corrosion-resistant materials such as 316L stainless steel and silicon carbide, its service life can be significantly extended, reducing the frequency of system downtime for maintenance.

[0045] Furthermore, under the same pipe diameter conditions, the flow cross-sectional area of ​​the spiral groove is much larger than that of the traditional swirl structure, possessing greater flow capacity. This allows for higher flow output without increasing the number of main pipe openings, reducing the complexity of the spray layer piping and system pressure drop. Therefore, the spiral hollow cone nozzle 7 combines five major advantages: high flow rate, anti-clogging, fine atomization, wide angle, and maintenance-free operation, making it an ideal choice for applications such as CFB boiler desulfurization absorption towers that demand extremely high operational stability and desulfurization efficiency.

[0046] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. 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 mud spraying device for a CFB boiler desulfurization absorption tower, characterized in that: The system includes a spraying mechanism and a flue gas distribution mechanism, with the flue gas distribution mechanism located below the spraying mechanism. The flue gas distribution mechanism includes a perforated plate (1) and a gas distribution hood (2). The gas distribution hood (2) is positioned at the center of the perforated plate (1), and its outer diameter is smaller than that of the perforated plate (1). The gas distribution hood (2) communicates with the holes on the perforated plate (1), and the gas distribution hood (2) is provided with several ventilation holes (10). The spraying mechanism includes a liquid supply pipe (3) and a spray pipe (4). The spray pipe (4) is provided with nozzles (7), and the spray pipes (4) are spaced apart along the circumference of the gas distribution hood (2). Each spray pipe (4) is connected at one end to the liquid supply pipe (3) and extends to the edge of the perforated plate (1) at the other end.

2. The mud spraying equipment for a CFB boiler desulfurization absorption tower according to claim 1, characterized in that: The air distribution hood (2) is conical, and the large-diameter end of the air distribution hood (2) is fixed on the perforated plate (1).

3. The mud spraying equipment for a CFB boiler desulfurization absorption tower according to claim 2, characterized in that: The spray pipe (4) includes an inclined part (5) and a horizontal part (6). The inclined part (5) is arranged parallel to the outer wall of the air distribution hood (2), and the horizontal part (6) is arranged parallel to the perforated plate (1).

4. The mud spraying equipment for a CFB boiler desulfurization absorption tower according to claim 2, characterized in that: The ventilation hole (10) is a strip-shaped hole, and the length direction of each ventilation hole (10) is the same as the generatrix direction of the air distribution cover (2).

5. The mud spraying equipment for a CFB boiler desulfurization absorption tower according to claim 4, characterized in that: The ventilation holes (10) are spaced apart along the generatrix direction of the air distribution hood (2).

6. A mud spraying device for a CFB boiler desulfurization absorption tower according to claim 4 or 5, characterized in that: The air distribution hood (2) is provided with a liquid collection tank (9) at the position between two adjacent air vents (10), and the length direction of the liquid collection tank (9) is the same as the generatrix direction of the air distribution hood (2).

7. The mud spraying equipment for a CFB boiler desulfurization absorption tower according to claim 6, characterized in that: The porous plate (1) is provided with a liquid guiding groove (11), one end of which is connected to the liquid collecting groove (9), and the other end extends to the middle of the porous plate (1). The liquid guiding groove (11) is connected to the holes on the porous plate (1).

8. The mud spraying equipment for a CFB boiler desulfurization absorption tower according to claim 1, characterized in that: The porous plate (1) is provided with a baffle (8) at its edge. The baffle (8) is an annular structure. There is a liquid collection gap between the inner wall of the baffle (8) and the outer wall of the air distribution hood (2). The liquid collection gap is connected to the holes on the porous plate (1).

9. The mud spraying equipment for a CFB boiler desulfurization absorption tower according to claim 1, characterized in that: The nozzle (7) is a spiral hollow cone nozzle.

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