Air inlet adjusting device for coal-fired unit boiler

Abstract

The utility model provides an air inlet adjusting device for a coal-fired unit boiler, which is arranged between an air inlet pipeline and a hearth and comprises a first channel, a second channel, a first rotating plate and a second rotating plate, the first channels and the second channels group all the air outlets into multiple groups of air outlet areas; a first baffle and a second baffle which can be opened and closed are arranged on the two sides of the first channel respectively, and a third baffle and a fourth baffle which can be opened and closed are arranged on the two sides of the second channel respectively. And the first rotating plate and the second rotating plate are rotatably arranged between the second baffle and the third baffle, and the positions of the first rotating plate and the second rotating plate are automatically adjusted according to the air inlet mode of the air inlet pipeline so as to adjust the air quantity flowing into the hearth in each group of air outlet areas. The air outlet is divided into a plurality of air outlet areas through the first channel and the second channel, and under the action of the first rotating plate and the second rotating plate, each air inlet mode of the air inlet pipeline can achieve uniform air outlet, so that the problem of insufficient coal combustion is avoided.

Description

Technical Field

[0001] This utility model belongs to the field of air intake technology for coal-fired power units, and particularly relates to an air intake regulating device for a coal-fired power unit boiler. Background Technology

[0002] Currently, the large air box structure for secondary air boxes in coal-fired power units is quite common. However, the existing large air box structure has operational drawbacks: under normal operating conditions, air enters the furnace relatively easily from both sides, but has difficulty entering the central area, resulting in oxygen deficiency during combustion in the central region. Oxygen deficiency combustion leads to increased carbon monoxide emissions. On the one hand, carbon monoxide, as a major component of incomplete combustion, affects the boiler's heat loss from incomplete combustion, reducing the boiler's thermal efficiency; on the other hand, excessive carbon monoxide affects the coking characteristics of coal, making coking more likely in the central region, thus affecting the safe operation of the coal-fired power unit. Therefore, ensuring balanced air supply to the boiler under normal operating conditions is of significant economic and safety importance.

[0003] Furthermore, due to the complexity of the system structure, boilers frequently experience auxiliary equipment failures, potentially requiring the operation of only one side of the fan. However, with a large wind box structure, single-sided operation can lead to a phenomenon similar to the central air shortage under dual-sided air supply mode: the air volume on one side tends to be excessive, while the other side receives almost no air. Excessive air volume can delay combustion and ignition, shift the flame center upwards, increase incomplete combustion losses in the boiler, and affect heat exchange on various heating surfaces. Conversely, the side with insufficient air volume will produce excessive carbon monoxide. Simultaneously, for the boiler as a whole, there is a significant heat dissipation between the left and right sides under these conditions, greatly increasing the risk of major accidents such as water-cooled wall tearing due to thermal stress concentration. Therefore, ensuring the uniformity of air supply under special operating conditions, namely single-sided air supply, is also significant for boiler operation. Utility Model Content

[0004] To address the problem of uneven air intake in existing furnaces leading to incomplete coal combustion, as described in the background art, this utility model proposes the following technical solution:

[0005] An air intake regulating device for a coal-fired boiler unit, disposed between an air intake duct and a furnace, includes: a first channel, a second channel, a first rotating plate, and a second rotating plate; the first channel and the second channel are respectively disposed above the air outlets of the air intake duct to group each air outlet into multiple air outlet areas; the first channel has an openable and closable first baffle and a second baffle on its two sides, and the second channel has an openable and closable third baffle and a fourth baffle on its two sides; the first rotating plate and the second rotating plate are rotatably disposed between the second baffle and the third baffle, and the first rotating plate and the second rotating plate adjust their positions automatically according to the air intake mode of the air intake duct to adjust the air volume flowing into the furnace from each group of air outlet areas; when the first rotating plate and the second rotating plate are parallel to each other, one of the first baffle and the fourth baffle is opened, and the other of the first baffle and the fourth baffle is closed.

[0006] During the air intake process of the air intake duct, one of the first baffle and the second baffle is opened, and the other of the first baffle and the second baffle is closed; one of the third baffle and the fourth baffle is opened, and the other of the third baffle and the fourth baffle is closed.

[0007] Furthermore, the rotation range of the first rotating plate is between 0° and 60°, and the rotation range of the second rotating plate is between 0° and 60°.

[0008] Furthermore, when the first rotating plate and the second rotating plate are parallel to each other, one of the first baffle and the fourth baffle is opened, and the other of the first baffle and the fourth baffle is closed.

[0009] Furthermore, when the first rotating plate and the second rotating plate intersect, the second baffle and the third baffle close simultaneously.

[0010] Furthermore, in the cross-section of the air inlet duct, the first channel and the second channel overlap each other.

[0011] Furthermore, in the longitudinal section of the air inlet duct, the line connecting the axis of rotation of the first rotating plate and the axis of rotation of the second rotating plate is collinear with the top of the first channel.

[0012] Beneficial effects: This utility model divides the air outlet into multiple air outlet areas through the first and second channels. Under the action of the first and second rotating plates, each air inlet mode of the air inlet pipe can achieve uniform air outlet, so as to avoid the problem of incomplete coal combustion. Attached Figure Description

[0013] Figure 1This is a schematic diagram of the longitudinal section of an air intake regulating device for a coal-fired boiler unit according to an embodiment of the present invention. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of this application clearer, the present invention will be described in further detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the scope of the present invention.

[0015] It should be understood that the terms “center,” “upper,” “lower,” “front,” “back,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this patent 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. Therefore, they should not be construed as limitations on this patent.

[0016] Figure 1 This is a schematic diagram of the longitudinal section of an air intake regulating device for a coal-fired boiler unit according to an embodiment of the present invention.

[0017] Reference Figure 1 According to an embodiment of the present invention, an air intake regulating device for a coal-fired boiler is disposed between an air intake duct 1 and a furnace 2, comprising: a first channel 3, a second channel 4, a first rotating plate 5, and a first rotating plate 6. The cavity of the air intake duct 1 is connected to the furnace 2 through multiple air outlets 11 at its bottom. The first channel 3 and the second channel 4 are respectively fixedly disposed above the air outlets 11 of the air intake duct 1, and the bottom of the first channel 3 is fixedly connected to the bottom of the air intake duct 1, and the bottom of the second channel 4 is also fixedly connected to the bottom of the air intake duct 1. After the first channel 3 and the second channel 4 are fixed, the air outlets 11 are divided into multiple groups, thereby forming multiple air outlet areas. The first channel 3 has an openable first baffle 31 and a second baffle 32 on both sides, and the second channel 4 has a third baffle 41 and a fourth baffle 42 on both sides. The first rotating plate 5 and the first rotating plate 6 are rotatably disposed between the second baffle 32 and the third baffle 41.

[0018] Specifically, there are three groups of air outlet zones, with an equal number of air outlets 11 in each group. One air outlet zone is located within the first channel 3, another within the second channel 4, and the third between the first and second channels 3 and 4. During the air intake process in the air intake channel, the first rotating plate 5 and the first rotating plate 6 adjust their positions according to the air intake mode of the air intake channel, thereby ensuring a stable and uniform flow of air into the furnace 2 from each group of air outlet zones.

[0019] Furthermore, the rotation range of the first rotating plate 5 is between 0° and 60°, and the rotation range of the first rotating plate 6 is also between 0° and 60°. In the cross-section of the air inlet duct 1, the first channel 3 and the second channel 4 coincide. In the longitudinal section of the air inlet duct 1, the line connecting the rotation axes of the first rotating plate 5 and the first rotating plate 6 is collinear with the top of the first channel 3.

[0020] The air intake modes include: bidirectional air intake mode, left-side air intake mode, and right-side air intake mode. When the air intake channel is in bidirectional air intake mode, the first baffle 31 is open, the second baffle 32 is closed, the third baffle 41 is closed, and the fourth baffle 42 is open. Air entering from the left side is split after passing through the first channel 3. Part of the air flows into the furnace 2 through the outlet area within the first channel 3, while the other part flows into the furnace 2 through the outlet area between the first channel 3 and the second channel 4. Similarly, air entering from the right side is split after passing through the second channel 4. Part of the air flows into the furnace 2 through the outlet area within the second channel 4, while the other part mixes with the air entering from the left side and flows into the furnace 2 through the outlet area between the first channel 3 and the second channel 4. During this process, there is an angle between the first rotating plate 5 and the first rotating plate 6 to allow the air entering from the left and right sides to mix.

[0021] When the air inlet channel is in left-side air inlet mode, the first baffle 31 is open, the second baffle 32 is closed, the third baffle 41 is open, and the fourth baffle 42 is closed. The air entering from the left is split after passing through the first channel 3. One part flows into the furnace 2 through the air outlet area in the first channel 3, while the other part enters between the first channel 3 and the second channel 4 and is split into the first and second parts. The first part flows into the furnace 2 through the air outlet area between the first channel 3 and the second channel 4, and the second part enters the second channel 4 through the third baffle 41 and then flows into the furnace 2 through the air outlet area in the second channel 4. In the above process, the first rotating plate 5 and the first rotating plate 6 are parallel to each other, and with the second baffle 32 as a reference, both the first rotating plate 5 and the first rotating plate 6 are tilted to the left, so that the other part of the air entering between the first channel 3 and the second channel 4 can be evenly split into the first and second parts, thereby ensuring that the air volume flowing into the furnace 2 from each group of air outlet areas is uniform.

[0022] Similarly, when the air duct is in the right-side air intake mode, the first baffle 31 is closed, the second baffle 32 is open, the third baffle 41 is closed, and the fourth baffle 42 is open. The air entering from the right side is split after passing through the first channel 3. One part flows into the furnace 2 through the air outlet area in the second channel 4, while the other part enters the space between the first channel 3 and the second channel 4 and is split into the third and fourth parts. The third part flows into the furnace 2 through the air outlet area between the first channel 3 and the second channel 4, and the fourth part enters the first channel 3 through the second baffle 32 and then flows into the furnace 2 through the air outlet area in the first channel 3. In the above process, the first rotating plate 5 and the first rotating plate 6 are parallel to each other, and with the third baffle 41 as a reference, both the first rotating plate 5 and the first rotating plate 6 are tilted to the right, so that the other part of the air entering the space between the first channel 3 and the second channel 4 can be evenly split into the third and fourth parts, thereby ensuring that the air volume flowing into the furnace 2 from each group of air outlet areas is uniform.

[0023] In summary, this utility model divides the air outlet into multiple air outlet areas through the first and second channels. Under the action of the first and second rotating plates, each air inlet mode of the air inlet pipe can achieve uniform air outlet, thereby avoiding the problem of incomplete coal combustion.

[0024] The above description describes specific embodiments of the utility model. Other embodiments are within the scope of the appended claims.

[0025] The terms “exemplary,” “example,” etc., used throughout this specification mean “serving as an example, instance, or illustration” and do not imply “preferred” or “advantageous” than other embodiments. Detailed descriptions are included for the purpose of providing an understanding of the described techniques. However, these techniques can be practiced without these detailed descriptions. In some instances, well-known structures and apparatuses are shown in block diagram form to avoid obscuring the concepts of the described embodiments.

[0026] The optional embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the embodiments of the present utility model are not limited to the specific details in the above embodiments. Within the scope of the technical concept of the embodiments of the present utility model, various simple modifications can be made to the technical solutions of the embodiments of the present utility model, and these simple modifications all fall within the protection scope of the embodiments of the present utility model.

[0027] The foregoing description of this specification is provided to enable any person skilled in the art to implement or use the content of this specification. Various modifications to the content of this specification will be apparent to those skilled in the art, and the general principles defined herein can be applied to other variations without departing from the scope of protection of this specification. Therefore, this specification is not limited to the examples and designs described herein, but is consistent with the widest scope of the principles and novel features disclosed herein.

Claims

1. An air intake regulating device for a coal-fired boiler unit, disposed between the air intake duct (1) and the furnace (2), characterized in that, include: The first channel (3), the second channel (4), the first rotating plate (5), and the second rotating plate (6) are arranged above the air outlet (11) of the air inlet duct (1), so as to group each air outlet (11) into multiple air outlet areas; the first channel (3) is provided with an openable first baffle (31) and a second baffle (32) on both sides, and the second channel (4) is provided with an openable third baffle (41) and a fourth baffle (42) on both sides; the first rotating plate (5) and the second rotating plate (6) are respectively provided with an openable third baffle (41) and a fourth baffle (42) on both sides; the first rotating plate (5) and the second rotating plate (6) are respectively provided with an openable third baffle (41) and a fourth baffle (42) on both sides. The second rotating plate (6) is rotatably disposed between the second baffle (32) and the third baffle (41). The first rotating plate (5) and the second rotating plate (6) adjust their positions according to the air intake mode of the air intake duct (1) to adjust the air volume flowing into the furnace (2) of each group of air outlet areas. When the first rotating plate (5) and the second rotating plate (6) are parallel to each other, one of the first baffle (31) and the fourth baffle (42) is opened, and one of the first baffle (31) and the fourth baffle (42) is closed.

2. The air intake regulating device for a coal-fired boiler unit according to claim 1, characterized in that, During the air intake process of the air intake duct (1), one of the first baffle (31) and the second baffle (32) is opened, and the other of the first baffle (31) and the second baffle (32) is closed; one of the third baffle (41) and the fourth baffle (42) is opened, and one of the third baffle (41) and the fourth baffle (42) is closed.

3. The air intake regulating device for a coal-fired boiler unit according to claim 2, characterized in that, The rotation range of the first rotating plate (5) is between 0° and 60°, and the rotation range of the second rotating plate (6) is between 0° and 60°.

4. The air intake regulating device for a coal-fired boiler unit according to claim 2, characterized in that, When the first rotating plate (5) and the second rotating plate (6) intersect, the second baffle (32) and the third baffle (41) close simultaneously.

5. The air intake regulating device for a coal-fired boiler unit according to claim 4, characterized in that, On the cross-section of the air inlet duct (1), the first channel (3) and the second channel (4) overlap each other.

6. The air intake regulating device for a coal-fired boiler unit according to claim 5, characterized in that, On the longitudinal section of the air inlet duct (1), the line connecting the axis of rotation of the first rotating plate (5) and the axis of rotation of the second rotating plate (6) is collinear with the top of the first channel (3).

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