Coal-fired boiler tail flue dust removal device

Abstract

The utility model relates to the field of boiler tail gas dust removal, concretely relates to a coal-fired boiler tail smoke dust removal device, include: dust removal cylinder and be located dust removal cylinder lower end intake pipe and water inlet pipe, intake pipe and water inlet pipe are located dust removal cylinder's both sides respectively, the surface of water inlet pipe detachably installs a plurality of sprays along the circumference equidistance, the baffle group for prolonging and disturbing airflow path is equipped in dust removal cylinder upper portion inner wall, the utility model discloses through spacing arrangement along the axial direction of water inlet pipe to multiple sprays, and makes the spray direction of every height's sprays encircle the axis distribution on its circumference, and the three -dimensional water curtain network that a whole inner wall surface of dust removal cylinder is covered is constituted together, this arrangement mode effectively eliminates the possible spray dead angle of traditional arrangement, ensures that the flue gas of entering dust removal cylinder can all with water fog fully contact, has improved the initial dust removal effect and dust particle's wetting capture rate significantly.

Description

Technical Field

[0001] This utility model relates to the field of boiler exhaust gas dust removal, and in particular to a dust removal device for coal-fired boiler exhaust gas. Background Technology

[0002] Coal-fired boilers generate a large amount of flue gas during operation, which contains pollutants such as dust and sulfides. Direct emission of these flue gas would cause serious air pollution. Currently, wet scrubbing technology is widely used in boiler flue gas treatment. Its principle is to wet dust particles with water mist, causing them to settle and thus achieving dust removal. Existing wet dust collection devices typically combine spray dust suppression with physical interception. Specifically, nozzles are installed in dust collection towers or dust collection cylinders to spray water mist, causing dust particles to be captured by the droplets, gain weight, and settle. At the same time, baffles, swirl plates, and other components are installed in the airflow channel to further separate the gas-liquid two-phase flow by changing the airflow path and using principles such as inertial collision and centrifugal separation, capturing the droplets carried within, thereby achieving deep dust removal and demisting. However, these devices still have some shortcomings in actual operation. First, if the nozzles are not arranged properly, the water mist may not cover the cross-section of the dust collector, resulting in spray dead zones. This prevents some flue gas from fully contacting the water mist, affecting the initial dust suppression effect. Second, although traditional fixed baffle groups can change the airflow path, their flow channel shape is simple and their adaptability to droplets and dust particles of different sizes is limited. Especially when the flue gas flow fluctuates due to changes in boiler load, the fixed airflow path is difficult to maintain a high gas-liquid separation efficiency over a wide load range. Utility Model Content

[0003] In view of this, the purpose of this utility model is to propose a dust removal device for flue gas from coal-fired boilers to solve the technical problems in the prior art.

[0004] To achieve the above objectives, this utility model provides a dust removal device for flue gas from a coal-fired boiler, comprising: The dust collector includes an air inlet pipe and a water inlet pipe located at the lower end of the dust collector. The air inlet pipe and the water inlet pipe are located on both sides of the dust collector. Several nozzles are detachably installed on the surface of the water inlet pipe at equal intervals along the circumference. A baffle group is provided on the upper inner wall of the dust collector to extend and disturb the airflow path. The baffle group includes a first series of baffles and a second series of baffles located on opposite sides of the inner wall of the dust collector. The first series of baffles and the second series of baffles are staggered in the axial direction of the dust collector, and both the first series of baffles and the second series of baffles are inclined relative to the radial direction of the dust collector.

[0005] Preferably, the plurality of nozzles are spaced apart along the axial direction of the water inlet pipe, and the spray direction of each nozzle at each height is distributed around the axis of the water inlet pipe in the circumferential direction of the water inlet pipe, so that the jet flow of all the nozzles together covers the entire inner wall surface of the dust collector.

[0006] Preferably, the inclination directions of the first series of baffles and the second series of baffles are symmetrical about the central axis of the dust collector.

[0007] Preferably, both the first series of baffles and the second series of baffles are inclined downwards, and the inclination angle ranges from 15° to 60°.

[0008] Preferably, the bottom surfaces of both the first series of baffles and the second series of baffles are provided with continuous tooth-like structures, which are composed of multiple periodically arranged protrusions and grooves.

[0009] Preferably, the dust removal device further includes an adjustment assembly disposed on the dust removal cylinder for adjusting the angle of the first series of baffles and the second series of baffles, the adjustment assembly comprising: A rotating shaft is fixedly installed inside the first series baffle and the second series baffle, respectively, near the inner wall of the dust collector. One end of the rotating shaft is rotatably installed outside the dust collector through a rotating seal. A gear is fixedly installed at the end of the rotating shaft. An electric push rod is fixed to the outer wall of the dust collector. A connecting plate is fixedly installed at the output end of the electric push rod, and racks are fixedly installed at both ends of the connecting plate. The two racks mesh with the adjacent gears respectively.

[0010] Preferably, the ends of the first series baffles and the second series baffles near the inner wall of the dust collector are provided with arc surfaces, and the arc surfaces of the first series baffles and the second series baffles abut against the inner wall of the dust collector.

[0011] Preferably, a sealing cover is fixedly installed on the side of the dust collector near the electric push rod, and the adjustment component is located inside the sealing cover.

[0012] The beneficial effects of this utility model are as follows: The coal-fired boiler flue gas dust removal device of this utility model, by arranging multiple nozzles at intervals along the axial direction of the water inlet pipe and distributing the spray direction of each nozzle at a certain height around the axis in the circumferential direction, together forms a three-dimensional water curtain network covering the entire inner wall of the dust removal cylinder. This arrangement effectively eliminates the spray dead zones that may exist in traditional arrangements, ensuring that all flue gas entering the dust removal cylinder can fully contact the water mist, significantly improving the initial dust suppression effect and the wetting and capture rate of dust particles. By arranging the first and second series of baffles in an alternating and inclined manner, and setting a continuous toothed structure on the bottom surface of the first and second series of baffles, this design promotes the convergence and rapid dripping of captured droplets at the tips of the serrations. In addition, the adjustable angle of the first and second series of baffles allows for a larger angle to be adjusted to reduce resistance under high load, and a smaller angle to be adjusted to maintain sufficient flow channel tortuosity and gas-liquid contact time under low load. This enables the baffles to maintain high efficiency in dust removal and demisting under a wide range of operating conditions, making them highly practical. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in 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 for this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a perspective view of the present utility model; Figure 2 This is a schematic diagram of the main cross-section of the present invention; Figure 3 This is a top view of the water inlet pipe and nozzle of this utility model; Figure 4 This is a partial structural diagram of the dust collector, electric push rod, and rack of this utility model; Figure 5 This is a partial structural diagram of the first series of baffles, gears, and electric push rods of this utility model; Figure 6 for Figure 5 Enlarged schematic diagram of the structure at point A in the middle.

[0015] The diagram is marked as follows: 1. Dust collector; 101. Air inlet pipe; 2. Water inlet pipe; 201. Nozzle; 3. First series baffle; 4. Second series baffle; 5. Rotating shaft; 6. Gear; 7. Electric push rod; 8. Connecting plate; 9. Rack; 10. Sealing cover; 11. Toothed structure. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments.

[0017] It should be noted that, unless otherwise defined, the technical or scientific terms used in this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0018] The first aspect of this utility model proposes a dust removal device for flue gas from a coal-fired boiler, such as... Figure 1-6 As shown, it includes: The dust collector 1 includes an air inlet pipe 101 and a water inlet pipe 2 located at the lower end of the dust collector 1. The air inlet pipe 101 and the water inlet pipe 2 are located on both sides of the dust collector 1. Several nozzles 201 are detachably installed at equal intervals along the circumference of the surface of the water inlet pipe 2. The nozzles 201 are detachable by threaded connection for easy maintenance. A baffle assembly is provided on the upper inner wall of the dust collector 1 to extend and disturb the airflow path. The baffle assembly includes a first series of baffles 3 and a second series of baffles 4 located on opposite sides of the inner wall of the dust collector 1. The first series of baffles 3 and the second series of baffles 4 are staggered in the axial direction of the dust collector 1, and both the first series of baffles 3 and the second series of baffles 4 are inclined relative to the radial direction of the dust collector 1.

[0019] In the process of dust removal from the flue gas of a coal-fired boiler, the flue gas that needs to be dusted is discharged into the dust collector 1 through the air inlet pipe 101, and water is pumped through the water inlet pipe 2 to the nozzle 201 to spray water mist. The flue gas that has been dusted by the water mist passes through the first series of baffles 3 and the second series of baffles 4. The airflow carries some tiny droplets. The first series of baffles 3 and the second series of baffles 4 change the airflow path to capture the droplets. The captured droplets flow down the baffles under the action of gravity and eventually return to the tower body.

[0020] In this embodiment, multiple nozzles 201 are spaced apart along the axial direction of the water inlet pipe 2. Furthermore, the spray direction of each nozzle 201 at each height is distributed around the axis of the water inlet pipe 2 in the circumferential direction of the pipe, ensuring that the spray streams from all nozzles 201 collectively cover the entire inner wall of the dust collector 1. This method of nozzle installation creates a three-dimensional water curtain network covering the entire inner wall of the dust collector 1. It avoids the problem of insufficient circumferential length of the water inlet pipe 2, which would limit the number of nozzles 201 that can be installed, resulting in incomplete water mist coverage, dead zones, and situations where a small amount of airflow mist cannot penetrate the water mist to effectively capture dust particles.

[0021] In this embodiment, the inclination directions of the first series of baffles 3 and the second series of baffles 4 are symmetrical about the central axis of the dust collector 1. This symmetrical arrangement causes the airflow to repeatedly impact the baffles during its ascent, forming an "S"-shaped path and significantly extending the residence time.

[0022] In this embodiment, both the first series baffles 3 and the second series baffles 4 are inclined downwards, and the inclination angle ranges from 15° to 60°.

[0023] When saturated flue gas carrying droplets is forced to change direction and follow an "S" shaped path, the larger droplets, due to their greater inertia, cannot flexibly follow the airflow as they do with smaller gas molecules. Therefore, they directly collide with the surface of the baffle and are captured. The captured droplets flow down the baffle under the action of gravity and eventually return to the dust collector 1. The first baffle captures most of the large droplets, while the second baffle can more effectively handle the remaining, more difficult-to-capture small droplets.

[0024] In this embodiment, the bottom surfaces of both the first series of baffles 3 and the second series of baffles 4 are provided with continuous toothed structures 11, which are composed of multiple periodically arranged protrusions and grooves. By providing the toothed structures 11 on the bottom surfaces of the first series of baffles 3 and the second series of baffles 4, droplets are more easily gathered and dripped at the tips of the teeth, reducing the risk of the liquid film being torn apart again by the airflow.

[0025] In this embodiment: the dust removal device further includes an adjustment assembly disposed on the dust removal cylinder 1 for adjusting the angle of the first series baffles 3 and the second series baffles 4. The adjustment assembly includes: A rotating shaft 5 is fixedly installed inside the first series baffle 3 and the second series baffle 4, respectively, near the inner wall of the dust collector 1. One end of the rotating shaft 5 is rotatably installed outside the dust collector 1 through a rotary seal. A gear 6 is fixedly installed at the end of the rotating shaft 5. It should be noted that a rotary seal is provided between the end of the rotating shaft 5 and the dust collector 1, and the rotary seal is used to seal the gap between the dust collector 1 and the rotating shaft 5.

[0026] An electric push rod 7 is fixed to the outer wall of the dust collector 1. A connecting plate 8 is fixedly installed at the output end of the electric push rod 7, and racks 9 are fixedly installed at both ends of the connecting plate 8. The two racks 9 mesh with adjacent gears 6 respectively.

[0027] Since the boiler load is not constant, at high loads, the flue gas volume is large and the flow rate is fast, which may require a wider baffle angle to reduce resistance; at low loads, the flow rate is slow, which may require a more tortuous angle to ensure demisting efficiency. When it is necessary to adjust the angles of the first series baffles 3 and the second series baffles 4 according to different operating conditions, the rack 9 is moved by the electric push rod 7, which drives the gear 6 to rotate, thereby adjusting the angle of each baffle to adapt to different flue gas flow rates and dust concentrations. The adjustable design enables it to maintain high-efficiency dust removal and demisting performance under various loads, improving practicality.

[0028] In this embodiment, the ends of the first series baffles 3 and the second series baffles 4 near the inner wall of the dust collector 1 are designed with arc surfaces, and the arc surfaces of one end of the first series baffles 3 and the second series baffles 4 abut against the inner wall of the dust collector 1. When the angle of the first series baffles 3 and the second series baffles 4 is adjusted, the first series baffles 3 and the second series baffles 4 always remain in contact with the inner wall of the dust collector 1 to prevent mist from flowing out from the gap between the baffles and the dust collector 1.

[0029] In this embodiment, a sealing cover 10 is fixedly installed on the side of the dust collector 1 closest to the electric push rod 7, and the adjustment component is located inside the sealing cover 10. By setting the sealing cover 10, the adjustment component is completely covered to prevent dust and moisture from entering and to ensure the stable operation of the adjustment component.

[0030] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; within the framework of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.

[0031] This utility model is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A dust removal device for flue gas from a coal-fired boiler, characterized in that, include: The dust collector (1) and the air inlet pipe (101) and water inlet pipe (2) located at the lower end of the dust collector (1), the air inlet pipe (101) and the water inlet pipe (2) are respectively located on both sides of the dust collector (1), and a number of nozzles (201) are detachably installed on the surface of the water inlet pipe (2) at equal intervals along the circumference. A baffle group is provided on the upper inner wall of the dust collector (1) to extend and disturb the airflow path. The baffle group includes a first series of baffles (3) and a second series of baffles (4) located on opposite sides of the inner wall of the dust collector (1). The first series of baffles (3) and the second series of baffles (4) are staggered in the axial direction of the dust collector (1), and both the first series of baffles (3) and the second series of baffles (4) are inclined relative to the radial direction of the dust collector (1).

2. The dust removal device for flue gas from a coal-fired boiler according to claim 1, characterized in that, Multiple nozzles (201) are spaced apart along the axial direction of the water inlet pipe (2), and the spray direction of each nozzle (201) at each height is distributed around the axis of the water inlet pipe (2) in the circumferential direction of the water inlet pipe (2), so that the jet flow of all the nozzles (201) together covers the entire inner wall surface of the dust removal cylinder (1).

3. The dust removal device for flue gas from a coal-fired boiler according to claim 1, characterized in that, The inclination directions of the first series of baffles (3) and the second series of baffles (4) are symmetrical about the central axis of the dust collector (1).

4. The dust removal device for flue gas from a coal-fired boiler according to claim 3, characterized in that, Both the first series of baffles (3) and the second series of baffles (4) are inclined downwards, and the inclination angle ranges from 15° to 60°.

5. The dust removal device for flue gas from a coal-fired boiler according to claim 4, characterized in that, The bottom surfaces of the first series of baffles (3) and the second series of baffles (4) are provided with continuous tooth-like structures (11), which are composed of multiple periodically arranged protrusions and grooves.

6. The dust removal device for flue gas from a coal-fired boiler according to claim 4, characterized in that, The dust removal device further includes an adjustment component disposed on the dust removal cylinder (1) for adjusting the angle of the first series of baffles (3) and the second series of baffles (4), the adjustment component comprising: A rotating shaft (5) is fixedly installed on the first series baffle (3) and the second series baffle (4) respectively, and is located near the inner wall of the dust collector (1). One end of the rotating shaft (5) is rotatably installed on the outside of the dust collector (1) through a rotating seal. A gear (6) is fixedly installed at the end of the rotating shaft (5). An electric push rod (7) is fixed to the outer wall of the dust collector (1). A connecting plate (8) is fixedly installed at the output end of the electric push rod (7), and racks (9) are fixedly installed at both ends of the connecting plate (8). The two racks (9) mesh with the adjacent gears (6) respectively.

7. The dust removal device for flue gas from a coal-fired boiler according to claim 6, characterized in that, The ends of the first series baffle (3) and the second series baffle (4) near the inner wall of the dust collector (1) are set as arc surfaces, and the arc surfaces of the first series baffle (3) and the second series baffle (4) are attached to the inner wall of the dust collector (1).

8. A dust removal device for flue gas from a coal-fired boiler according to claim 6, characterized in that, A sealing cover (10) is fixedly installed on the side of the dust collector (1) near the electric push rod (7), and the adjustment component is located inside the sealing cover (10).

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