A coarse powder separator that can dynamically guide the flow concentration of pulverized coal.

Abstract

This utility model discloses a coarse coal separator with dynamically guiding coal powder flow concentration, including a raw coal feed pipe, a fine coal powder outlet pipe, a separator outer shell, and a separator inner shell connected to each other. The conical inner surface of the separator outer shell and the conical outer surface of the separator inner shell form an annular channel. An adjusting guide assembly and an axial baffle assembly are installed in the annular channel. The adjusting guide assembly includes an adjustable dynamic guide baffle disposed in the annular channel. A connecting rod is fixed to one side of the adjustable dynamic guide baffle. One end of the connecting rod is installed in the separator inner shell, and the other end extends out of the separator outer shell and is connected to an actuator. The axial baffle assembly includes multiple separator axial baffles, which are installed on a rotating shaft. The two ends of the rotating shaft are respectively installed on the separator outer shell and the separator inner shell. This separator can dynamically adjust the coal powder concentration entering the annular channel, so that the coal powder concentration of each fine coal powder outlet pipe is basically uniform and the coal powder fineness meets the requirements.

Description

Technical Field

[0001] This utility model belongs to the field of thermal power generation technology, and relates to coal mill systems. Specifically, it is applied to a coarse powder separator at the outlet of a coal mill that can dynamically guide the flow concentration of pulverized coal. Background Technology

[0002] The separator is one of the key pieces of equipment in the pulverizing system of a thermal power plant, and its performance has a significant impact on the operation and efficiency of the boiler. Although the separators currently in use can adjust the fineness of the pulverized coal, they cannot adjust the concentration of the pulverized coal. This leads to problems during operation, such as large deviations in the concentration of pulverized coal in various pulverized coal pipelines, the inability to dynamically adjust the concentration of pulverized coal resulting in poor pulverized coal separation, severe wear, and high pulverizing power consumption. These problems directly affect the economy and reliability of the boiler and the entire unit. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a coarse powder separator that can dynamically guide the flow concentration of pulverized coal, thereby solving the technical problem that the concentration of pulverized coal is not adjustable in the existing technology.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A coarse coal separator capable of dynamically guiding the flow concentration of pulverized coal includes a raw coal feed pipe, a separator outer shell, and a separator inner shell arranged coaxially. The separator inner shell is fitted inside the separator outer shell. Both the separator outer shell and the separator inner shell are inverted cones with open bottoms. The conical inner surface of the separator outer shell and the conical outer surface of the separator inner shell form an annular channel. The bottom end of the raw coal feed pipe passes through the top ends of the separator outer shell and the separator inner shell in sequence, extending to the bottom end of the separator inner shell. The bottom end of the separator outer shell is connected to a coal mill. The top end of the separator outer shell is connected to multiple fine coal powder outlet pipes. Multiple equally spaced adjusting guide components are installed at the bottom of the annular channel, and an axial baffle assembly is installed at the top of the annular channel.

[0006] The adjustable guide assembly includes an actuator, a connecting rod, and an adjustable dynamic guide baffle connected in sequence. One end of the connecting rod is connected to the outer surface of the separator inner shell, and the other end of the connecting rod extends out of the separator outer shell and is connected to the actuator. The adjustable dynamic guide baffle is disposed in the annular channel, and one side of the adjustable dynamic guide baffle is fixedly installed on the connecting rod.

[0007] The axial baffle assembly includes multiple separator axial baffles that are radially and equally spaced along the annular channel. The separator axial baffles are movably mounted on a rotating shaft with its two ends respectively mounted on the inner surface of the separator housing and the outer surface of the separator inner housing.

[0008] This utility model also includes the following technical features:

[0009] The adjustable dynamic guide baffle is an isosceles trapezoidal structure. The lower base of the adjustable dynamic guide baffle is fixedly connected to the side wall of the connecting rod. The connecting rod is perpendicular to the conical inner surface of the separator housing and the conical outer surface of the separator housing. There is an angle between the adjustable dynamic guide baffle and the cross-section of the annular channel.

[0010] The angle between the adjustable dynamic guide baffle and the cross-section of the annular channel is 30° to 75°.

[0011] The actuator is a drive motor, and the other end of the connecting rod is fixedly connected to the drive shaft of the drive motor.

[0012] The aforementioned adjustment guide components consist of three parts.

[0013] The separator axial baffle has a hexagonal structure. The rotating shaft coincides with the long axis of the separator axial baffle. The rotating shaft is perpendicular to the conical inner surface of the separator housing and the conical outer surface of the separator inner housing. The separator axial baffle can rotate around the rotating shaft.

[0014] The adjustable dynamic guide baffle and the separator axial baffle are made of wear-resistant steel plates.

[0015] Compared with the prior art, this utility model has the following technical effects:

[0016] This invention can dynamically adjust the coal powder concentration entering the annular channel, so that the coal powder concentration in each fine coal powder outlet pipe is basically uniform, and the coal powder fineness meets the requirements of boiler combustion, ensuring that the boiler can burn stably and economically under different loads. Attached Figure Description

[0017] Figure 1 This is a front sectional view of the overall structure of this utility model.

[0018] Figure 2 This is a schematic diagram of the distribution structure of the adjustment guide component of this utility model.

[0019] Figure 3 This is a schematic diagram of the distribution structure of the axial baffle assembly of this utility model.

[0020] The meanings of the labels in the diagram are as follows:

[0021] 1. Raw coal feed pipe; 2. Separator outer shell; 3. Separator inner shell; 4. Fine coal powder outlet pipe; 5. Adjustment and guide assembly; 6. Axial baffle assembly.

[0022] 51. Actuator; 52. Connecting rod; 53. Adjustable dynamic guide baffle;

[0023] 61. Separator axial baffle; 62. Rotary shaft.

[0024] The specific content of this utility model will be further explained in detail below with reference to the embodiments. Detailed Implementation

[0025] Following the above technical solution, the following are specific embodiments of this utility model. It should be noted that this utility model is not limited to the following specific embodiments, and all equivalent modifications made based on the technical solution of this application fall within the protection scope of this utility model.

[0026] In this utility model, unless otherwise stated, directional terms such as "upper", "lower", "left", and "right" are generally defined based on the drawing in the corresponding figure; "inner" and "outer" refer to the inner and outer contours of the corresponding components; and "longitudinal", "transverse", and "vertical" refer to the directions marked in the figure.

[0027] Example:

[0028] This embodiment provides a coarse powder separator that can dynamically guide the flow concentration of pulverized coal, such as... Figures 1 to 3 As shown, the system includes a raw coal feed pipe 1, a separator outer shell 2, and a separator inner shell 3 arranged coaxially. The separator inner shell 3 is fitted inside the separator outer shell 2. Both the separator outer shell 2 and the separator inner shell 3 are inverted cones with open bottoms. The conical inner surface of the separator outer shell 2 and the conical outer surface of the separator inner shell 3 form an annular channel. The bottom end of the raw coal feed pipe 1 passes through the top ends of the separator outer shell 2 and the separator inner shell 3 in sequence and extends to the bottom end of the separator inner shell 3. The bottom end of the separator outer shell 2 is connected to the coal mill. The top end of the separator outer shell 2 is connected to multiple fine coal powder outlet pipes 4. Multiple equally spaced adjusting guide components 5 are installed at the bottom of the annular channel. An axial baffle assembly 6 is installed at the top of the annular channel.

[0029] The adjusting guide assembly 5 includes an actuator 51, a connecting rod 52, and an adjustable dynamic guide baffle 53 connected in sequence. One end of the connecting rod 52 is connected to the outer surface of the separator inner shell 3, and the other end of the connecting rod 52 extends out of the separator outer shell 2 and is connected to the actuator 51. The adjustable dynamic guide baffle 53 is disposed in the annular channel. One side of the adjustable dynamic guide baffle 53 is fixedly installed on the connecting rod 52. The actuator 51 drives the connecting rod 52 to adjust the area of ​​the adjustable dynamic guide baffle 53 covering the annular channel, thereby adjusting the concentration of coal powder entering the annular channel.

[0030] The axial baffle assembly 6 includes a plurality of separator axial baffles 61 that are radially and equally spaced along the annular channel. The separator axial baffles 61 are movably mounted on a rotating shaft 62, which is mounted at both ends on the inner surface of the separator housing 2 and the outer surface of the separator inner housing 3, respectively. The angle between the separator axial baffles 61 and the cross-section of the annular channel is adjustable.

[0031] In this embodiment, raw coal is transported from the raw coal feed pipe 1 to the coal mill at the bottom of the separator. The raw coal is crushed and ground into coal powder by the coal mill. The coarse and fine coal powders are sent to the bottom of the separator shell 2 by airflow. Multiple adjusting guide components 5 are used to adjust the inlet interface of the annular channel to adjust the coal powder concentration entering the annular channel. The coarse and fine powders are separated by the interception and inertia caused by the impact and deflection of the axial baffle 61 of the separator. When the airflow carries the coal powder through the axial baffle 61 of the separator, the larger coal powder particles have greater inertia and collide with the axial baffle 61 of the separator, falling back into the coal mill through the annular channel. The smaller coal powder particles have less inertia and pass through the axial baffle 61 of the separator with the airflow, finally being output from the fine coal powder outlet pipe 4. The coal powder concentration is controlled by the adjustable guide components 5 to improve the separation effect of the axial baffle components 6, so that the coal powder concentration of each fine coal powder outlet pipe 4 is basically uniform and the coal powder fineness meets the requirements of boiler combustion, ensuring that the boiler can burn stably and economically under different loads.

[0032] As a preferred embodiment, the adjustable dynamic guide baffle 53 is an isosceles trapezoidal structure. The bottom of the adjustable dynamic guide baffle 53 is fixedly connected to the side wall of the connecting rod 52. The connecting rod 52 is perpendicular to the conical inner surface of the separator housing 2 and the conical outer surface of the separator inner housing 3. The adjustable dynamic guide baffle 53 is rotated toward the bottom of the separator housing 2 with the connecting rod 52 as the axis and has an angle with the cross-section of the annular channel. The adjustable dynamic guide baffles 53 of the multiple adjustable guide components 5 are rotated in the same direction. The multiple equally spaced adjustable dynamic guide baffles 53 rotate at the same angle, rotating and guiding the coal powder to be separated carried by the airflow into the annular channel. By adjusting the angle between the adjustable dynamic guide baffle 53 and the cross-section of the annular channel, the concentration of coal powder entering the annular channel can be controlled.

[0033] Specifically, the angle between the adjustable dynamic guide baffle 53 and the cross-section of the annular channel is 30° to 75°.

[0034] As a preferred embodiment, the actuator 51 is a drive motor, and the other end of the connecting rod 52 is fixedly connected to the drive shaft of the drive motor. The angle between the adjustable dynamic guide baffle 53 and the cross-section of the annular channel is controlled by the drive motor.

[0035] Specifically, there are 3 adjustment guide components 5.

[0036] As a preferred embodiment, the separator axial baffle 61 is hexagonal in structure. The rotating shaft 62 coincides with the long axis of the separator axial baffle 61. The rotating shaft 62 is perpendicular to the conical inner surface of the separator outer shell 2 and the conical outer surface of the separator inner shell 3. The separator axial baffle 61 can rotate around the rotating shaft 62. The angle between the separator axial baffle 61 and the cross-section of the annular channel can also be adjusted. When the separator axial baffle 61 is adjusted to be parallel to the cross-section of the annular channel, the multiple equally spaced separator axial baffles 61 can divide the annular channel into two parts. Coarse coal powder cannot enter the upper part of the annular channel from the lower part, thus achieving coarse-fine separation.

[0037] As a preferred embodiment, the adjustable dynamic guide baffle 53 and the separator axial baffle 61 are made of wear-resistant steel plates, which can reduce wear and increase service life.

Claims

1. A coarse coal powder separator capable of dynamically guiding the flow concentration of pulverized coal, comprising a raw coal feed pipe (1), a separator outer shell (2), and a separator inner shell (3) arranged coaxially, wherein the separator inner shell (3) is fitted inside the separator outer shell (2), both the separator outer shell (2) and the separator inner shell (3) are inverted cones with open bottoms, the conical inner surface of the separator outer shell (2) and the conical outer surface of the separator inner shell (3) form an annular channel, the bottom end of the raw coal feed pipe (1) passes through the top ends of the separator outer shell (2) and the separator inner shell (3) in sequence and extends to the bottom end of the separator inner shell (3), the bottom end of the separator outer shell (2) is connected to a coal mill, and the top end of the separator outer shell (2) is connected to a plurality of fine coal powder outlet pipes (4), characterized in that, The bottom of the annular channel is equipped with multiple equally spaced adjusting guide components (5), and the top of the annular channel is equipped with an axial baffle assembly (6). The adjustable guide assembly (5) includes an actuator (51), a connecting rod (52), and an adjustable dynamic guide baffle (53) connected in sequence. One end of the connecting rod (52) is connected to the outer surface of the separator inner shell (3), and the other end of the connecting rod (52) extends out of the separator outer shell (2) and is connected to the actuator (51). The adjustable dynamic guide baffle (53) is disposed in the annular channel, and one side of the adjustable dynamic guide baffle (53) is fixedly installed on the connecting rod (52). The axial baffle assembly (6) includes a plurality of separator axial baffles (61) that are radially and equally spaced along the annular channel. The separator axial baffles (61) are movably mounted on a rotating shaft (62) with its two ends respectively mounted on the inner surface of the separator outer shell (2) and the outer surface of the separator inner shell (3).

2. The coarse powder separator with dynamically guided coal powder flow concentration as described in claim 1, characterized in that, The adjustable dynamic guide baffle (53) is an isosceles trapezoidal structure. The bottom of the adjustable dynamic guide baffle (53) is fixedly connected to the side wall of the connecting rod (52). The connecting rod (52) is perpendicular to the conical inner surface of the separator housing (2) and the conical outer surface of the separator inner housing (3). There is an angle between the adjustable dynamic guide baffle (53) and the cross-section of the annular channel.

3. The coarse powder separator with dynamically guided coal powder flow concentration as described in claim 2, characterized in that, The angle between the adjustable dynamic guide baffle (53) and the cross-section of the annular channel is 30° to 75°.

4. The coarse powder separator with dynamically guided coal powder flow concentration as described in claim 1, characterized in that, The actuator (51) is a drive motor, and the other end of the connecting rod (52) is fixedly connected to the drive shaft of the drive motor.

5. The coarse powder separator with dynamically guided coal powder flow concentration as described in claim 1, characterized in that, The aforementioned adjustment guide component (5) consists of 3 units.

6. The coarse powder separator with dynamically guided coal powder flow concentration as described in claim 1, characterized in that, The separator axial baffle (61) has a hexagonal structure. The rotating shaft (62) coincides with the long axis of the separator axial baffle (61). The rotating shaft (62) is perpendicular to the conical inner surface of the separator outer shell (2) and the conical outer surface of the separator inner shell (3). The separator axial baffle (61) can rotate around the rotating shaft (62).

7. The coarse powder separator with dynamically guided coal powder flow concentration as described in claim 1, characterized in that, The adjustable dynamic guide baffle (53) and the separator axial baffle (61) are both made of wear-resistant steel plate.

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