Device for improving pulverized coal distribution uniformity of boiler pulverizing system

Abstract

The utility model provides a device for improving pulverized coal distribution uniformity of a boiler pulverizing system. The device comprises a horizontal pulverized coal pipeline, a first horizontal buffer pipeline, an elbow, a second horizontal buffer pipeline, a pulverized coal equally-distributing device and a flow guiding device. An inlet of the elbow is connected with the horizontal pulverized coal pipeline through a first horizontal buffer pipeline, and an outlet of the elbow is connected with the pulverized coal equipartition device through a second horizontal buffer pipeline; the flow guide device is arranged in the first horizontal buffer pipeline, the elbow and the second horizontal buffer pipeline, the flow guide device comprises at least one vertical flow guide plate and at least one horizontal flow guide plate, and any vertical flow guide plate is perpendicular to any horizontal flow guide plate. According to the device for improving the pulverized coal distribution uniformity of the boiler pulverizing system, uniform distribution of the concentration of pulverized coal entering the pulverized coal uniform distributor in the horizontal direction can be achieved at the elbow in front of the pulverized coal uniform distributor through the flow guiding device, and the pulverized coal distribution uniformity is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of safe operation of boilers, and in particular to a device for improving uniformity of coal powder distribution in a boiler pulverizing system. BACKGROUND

[0002] For a coal-fired boiler with a capacity of 600 MW or more, a coal powder distributor is used in a main coal powder pipeline of a boiler pulverizing system to realize secondary distribution of coal powder before entering a furnace. Due to a limitation of space for arranging the pipeline, the coal powder distributor is often arranged with a horizontal bend.

[0003] Referring to Figure 1 , Figure 1 is a schematic diagram of concentration distribution of coal powder flowing through a bend in the prior art. As shown in Figure 1 , due to the bend and a large difference in density of the coal powder, high-density coal powder adheres to a wall to change a moving direction, and concentration distribution of the coal powder at an outlet is horizontally distributed with sparse coal powder on an inner side of the bend and dense coal powder on an outer side of the bend, which results in uneven distribution of the coal powder entering the coal powder distributor, poor distribution effect of the coal powder distributor, and further causes uneven burning of the boiler. CONTENT OF THE INVENTION

[0004] Therefore, the present application aims to provide a device for improving uniformity of coal powder distribution in a boiler pulverizing system, which can realize uniform distribution of concentration of coal powder entering a coal powder distributor in a horizontal direction by using a flow guide device at a bend in front of the coal powder distributor, and improve the uniformity of the coal powder distribution.

[0005] In a first aspect, the present application provides a device for improving uniformity of coal powder distribution in a boiler pulverizing system, which comprises a horizontal coal powder pipeline, a first horizontal buffer pipeline, a bend, a second horizontal buffer pipeline, a coal powder distributor, and a flow guide device. An inlet of the bend is connected to the horizontal coal powder pipeline through the first horizontal buffer pipeline, and an outlet of the bend is connected to the coal powder distributor through the second horizontal buffer pipeline. The flow guide device is arranged inside the first horizontal buffer pipeline, the bend, and the second horizontal buffer pipeline, and comprises at least one vertical flow guide plate and at least one horizontal flow guide plate. Any vertical flow guide plate is perpendicular to any horizontal flow guide plate.

[0006] This application provides a device for improving the uniformity of pulverized coal distribution in a boiler pulverizing system. The device includes a horizontal pulverized coal pipeline, a first horizontal buffer pipeline, an elbow, a second horizontal buffer pipeline, a pulverized coal distributor, and a flow guiding device. The inlet of the elbow is connected to the horizontal pulverized coal pipeline via the first horizontal buffer pipeline, and the outlet of the elbow is connected to the pulverized coal distributor via the second horizontal buffer pipeline. The flow guiding device is disposed inside the first horizontal buffer pipeline, the elbow, and the second horizontal buffer pipeline. The flow guiding device includes at least one vertical flow guide plate and at least one horizontal flow guide plate, with any vertical flow guide plate perpendicular to any horizontal flow guide plate. The device for improving the uniformity of pulverized coal distribution in a boiler pulverizing system provided by this application can achieve uniform horizontal distribution of pulverized coal concentration entering the pulverized coal distributor at the elbow before the pulverized coal distributor using the flow guiding device, thereby improving the uniformity of pulverized coal distribution.

[0007] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0008] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0009] Figure 1 This diagram illustrates the concentration distribution of pulverized coal as it flows through a bend in the prior art.

[0010] Figure 2 This invention provides a front view schematic diagram of a device for improving the uniformity of pulverized coal distribution in a boiler pulverizing system, according to an embodiment of this application.

[0011] Figure 3 The diagram shows a top view of a device for improving the uniformity of pulverized coal distribution in a boiler pulverizing system, as provided in an embodiment of this application.

[0012] In the diagram: 1-Horizontal pulverized coal pipeline; 2-First horizontal buffer pipeline; 3-Elbow; 4-Second horizontal buffer pipeline; 5-Pulverized coal distributor; 6-Flow guiding device; 7-Vertical guide plate; 8-Horizontal guide plate. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0014] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0015] In the description of this utility model, it should be noted that the terms "inner" and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are only for the convenience of describing this application 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 on this application. In addition, the terms "first" and "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0016] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" 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 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 application based on the specific circumstances.

[0017] Please see Figure 2 and Figure 3 , Figure 2 This is a front view schematic diagram of a device for improving the uniformity of pulverized coal distribution in a boiler pulverizing system, provided in an embodiment of this application. Figure 3 This application provides a top view of a device for improving the uniformity of pulverized coal distribution in a boiler pulverizing system.

[0018] like Figure 2 and Figure 3As shown in the figure, this application provides a device for improving the uniformity of pulverized coal distribution in a boiler pulverizing system, including a horizontal pulverized coal pipeline 1, a first horizontal buffer pipeline 2, an elbow 3, a second horizontal buffer pipeline 4, a pulverized coal distributor 5, and a flow guiding device 6; the inlet of the elbow 3 is connected to the horizontal pulverized coal pipeline 1 through the first horizontal buffer pipeline 2, and the outlet of the elbow 3 is connected to the pulverized coal distributor 5 through the second horizontal buffer pipeline 4; the flow guiding device 6 is disposed inside the first horizontal buffer pipeline 2, the elbow 3, and the second horizontal buffer pipeline 4, and the flow guiding device 6 includes at least one vertical flow guiding plate 7 and at least one horizontal flow guiding plate 8, wherein any vertical flow guiding plate 7 is perpendicular to any horizontal flow guiding plate 8.

[0019] The vertical guide plate 7 primarily functions to divide the flow field, evenly distribute pulverized coal, and reduce resistance at the bend. The horizontal guide plate 8 mainly provides structural support for the vertical guide plate 7. The guide device 6 ensures even distribution of the pulverized coal before it enters the bend 3, reducing the horizontal non-uniformity of pulverized coal concentration before it enters the pulverized coal distributor. This reduces the non-uniformity of pulverized coal before it enters the distributor, allowing the distributor to better achieve the desired distribution and reducing the possibility of uneven combustion under wide loads. Furthermore, the guide device 6 at the bend reduces the secondary horizontal flow of pulverized coal in the pipeline, thereby reducing the resistance of the primary air-coal pipeline at the bend and consequently reducing the output of the primary air fan, achieving a certain energy-saving effect.

[0020] Furthermore, the surface material of at least one vertical guide plate 7 and at least one horizontal guide plate 8 is wear-resistant ceramic to reduce the erosion of the guide device 6 by air dust.

[0021] Furthermore, the internal material of at least one vertical guide plate 7 and at least one horizontal guide plate 8 is stainless steel, which is used to resist the erosion of the airflow on the guide device 6.

[0022] Furthermore, at least one vertical guide plate 7 and at least one horizontal guide plate 8 have a thickness of 6 mm or more, which are also used to resist the erosion of the guide device 6 by the airflow.

[0023] Furthermore, the flow guiding device 6 is connected to the inner walls of the first horizontal buffer pipe 2, the elbow 3, and the second horizontal buffer pipe 4 by argon arc welding to improve the connection strength.

[0024] Furthermore, the length of the horizontal pulverized coal pipeline 1 is greater than or equal to six times the inner diameter of the elbow 3, in order to ensure that the pulverized coal before entering the elbow 3 is fully mixed in the horizontal pulverized coal pipeline 1.

[0025] Furthermore, the length of the first horizontal buffer pipe 2 is greater than or equal to one-quarter of the inner diameter of the elbow 3, in order to reduce the impact of gas resistance at the inlet of the elbow 3 on the equalization effect.

[0026] Furthermore, the length of the second horizontal buffer pipe 4 is greater than or equal to one-quarter of the inner diameter of the elbow 3, in order to prevent air and powder deviation at the outlet of the elbow 3.

[0027] Furthermore, the vertical guide plates 7 are vertically symmetrically distributed to refine the water content of the pulverized coal; the horizontal guide plates 8 are horizontally symmetrically distributed to improve the support strength.

[0028] Furthermore, at least one vertical guide plate 7 in the bend 3 shares a common center with the bend 3 in the horizontal direction, which is used to reduce the resistance of the air and powder flow through the bend 3.

[0029] This application provides a device for improving the uniformity of pulverized coal distribution in a boiler pulverizing system. The device includes a horizontal pulverized coal pipeline, a first horizontal buffer pipeline, an elbow, a second horizontal buffer pipeline, a pulverized coal distributor, and a flow guiding device. The inlet of the elbow is connected to the horizontal pulverized coal pipeline via the first horizontal buffer pipeline, and the outlet of the elbow is connected to the pulverized coal distributor via the second horizontal buffer pipeline. The flow guiding device is disposed inside the first horizontal buffer pipeline, the elbow, and the second horizontal buffer pipeline. The flow guiding device includes at least one vertical flow guide plate and at least one horizontal flow guide plate, with any vertical flow guide plate perpendicular to any horizontal flow guide plate. The device for improving the uniformity of pulverized coal distribution in a boiler pulverizing system provided by this application can achieve uniform horizontal distribution of pulverized coal concentration entering the pulverized coal distributor at the elbow before the pulverized coal distributor using the flow guiding device, thereby improving the uniformity of pulverized coal distribution.

[0030] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The scope of protection of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the scope of the technology disclosed in this application. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A device for improving the uniformity of pulverized coal distribution in a boiler pulverizing system, characterized in that, It includes a horizontal pulverized coal pipeline (1), a first horizontal buffer pipeline (2), an elbow (3), a second horizontal buffer pipeline (4), a pulverized coal distributor (5), and a flow guiding device (6); the inlet of the elbow (3) is connected to the horizontal pulverized coal pipeline (1) through the first horizontal buffer pipeline (2), and the outlet of the elbow (3) is connected to the pulverized coal distributor (5) through the second horizontal buffer pipeline (4); the flow guiding device (6) is disposed inside the first horizontal buffer pipeline (2), the elbow (3), and the second horizontal buffer pipeline (4), and the flow guiding device (6) includes at least one vertical flow guiding plate (7) and at least one horizontal flow guiding plate (8), wherein any vertical flow guiding plate (7) is perpendicular to any horizontal flow guiding plate (8).

2. The device for improving the uniformity of pulverized coal distribution in a boiler pulverizing system according to claim 1, characterized in that, The surface material of at least one vertical guide plate (7) and at least one horizontal guide plate (8) is wear-resistant ceramic.

3. The device for improving the uniformity of pulverized coal distribution in a boiler pulverizing system according to claim 1, characterized in that, The internal material of at least one vertical guide plate (7) and at least one horizontal guide plate (8) is stainless steel.

4. The device for improving the uniformity of pulverized coal distribution in a boiler pulverizing system according to claim 1, characterized in that, The thickness of the at least one vertical guide plate (7) and the at least one horizontal guide plate (8) is greater than or equal to 6 mm.

5. The device for improving the uniformity of pulverized coal distribution in a boiler pulverizing system according to claim 1, characterized in that, The flow guiding device (6) is connected to the inner wall of the first horizontal buffer pipe (2), the elbow (3), and the second horizontal buffer pipe (4) by argon arc welding.

6. The device for improving the uniformity of pulverized coal distribution in a boiler pulverizing system according to claim 1, characterized in that, The length of the horizontal pulverized coal pipeline (1) is greater than or equal to six times the inner diameter of the elbow (3).

7. The device for improving the uniformity of pulverized coal distribution in a boiler pulverizing system according to claim 1, characterized in that, The length of the first horizontal buffer pipe (2) is greater than or equal to one-quarter of the inner diameter of the elbow (3).

8. The device for improving the uniformity of pulverized coal distribution in a boiler pulverizing system according to claim 1, characterized in that, The length of the second horizontal buffer pipe (4) is greater than or equal to one-quarter of the inner diameter of the elbow (3).

9. The device for improving the uniformity of pulverized coal distribution in a boiler pulverizing system according to claim 1, characterized in that, Each of the vertical guide vanes (7) is vertically symmetrically distributed; each of the horizontal guide vanes (8) is horizontally symmetrically distributed.

10. The device for improving the uniformity of pulverized coal distribution in a boiler pulverizing system according to claim 1, characterized in that, The portion of the at least one vertical guide plate (7) in the bend (3) shares a common center with the bend (3) in the horizontal direction.

Images