A new type of impeller device for flow splitting

Abstract

This invention provides a novel flow-dividing impeller device, relating to the field of medium-speed coal mills. It includes at least a wind speed regulating ring, outer ring blades, an outer ring plate, a flow-dividing plate, inner ring blades, and an inner ring plate. The flow-dividing plate is located between the outer and inner ring plates, separating the impeller device into an inner channel and an outer channel. This novel flow-dividing impeller device can achieve efficient separation of pulverized coal particles and coke stones, effectively controlling the discharge of coke stones and improving the coal utilization rate of power plants.

Description

Technical Field

[0001] This invention relates to the field of medium-speed coal mills, and more specifically, to a novel flow-diverting impeller device. Background Technology

[0002] Currently, the impeller device is one of the key components of medium-speed coal mills used for coal powder separation. It is generally composed of parts such as inner ring, outer ring, blades, airfoil blades, throttling ring, and regulating ring. It is connected to the grinding bowl and rotates with it. Its function is to make the hot air blown from the primary air chamber more evenly distributed after passing through the impeller device, to separate the ground coal powder particles and stone coal, and to transport the coal powder particles to the coal mill separator for coal powder screening. During operation, the coal dust and coke particles ejected from the grinding bowl fall directly into the primary air chamber as they pass through the impeller. Due to the higher density of the coke particles, they are scraped out of the machine by the scraper. The coal dust particles can be carried away by the primary hot air. However, if the coal quality is poor or the operating conditions are poor, the amount of coke particles will increase, and the coal dust particles will be easily carried by the coke particles through the impeller and discharged with them. Therefore, it is necessary to adjust the ventilation area by using airfoil blades and throttling rings to increase the flow velocity at the impeller and reduce the discharge of coke particles and coke particles. However, this also increases the resistance of the impeller and the energy consumption of the coal mill. Turbulence and changes in airflow direction will also occur at the blades, which will increase the wear of the blades themselves, shorten the service life of the impeller, reduce the uniformity of airflow and air volume at the impeller, change the internal flow field distribution of the coal mill, and add additional wear-prone areas to the coal mill. This can easily lead to increased wear on the fit clearance between the regulating ring and the impeller, thus exacerbating the above problems. Summary of the Invention

[0003] The purpose of this invention is to provide a novel flow-diverting impeller device to solve the above problems.

[0004] This invention provides a novel impeller device for flow diversion, comprising at least a wind speed regulating ring, an outer ring blade, an outer ring plate, a flow diversion plate, an inner ring blade, and an inner ring plate. The flow diversion plate is disposed between the outer ring plate and the inner ring plate, thereby dividing the impeller device into an inner channel and an outer channel.

[0005] Optionally, the inner channel is not equipped with airfoil blades or throttling rings.

[0006] Optionally, the inner ring blades are uniformly arranged oblique blades.

[0007] Optionally, the top of the splitter plate is not lower than the top of the inner ring plate.

[0008] Optionally, the bottom of the diverter plate is not lower than the bottom of the inner ring plate.

[0009] Optionally, the position of the diverter plate is adjustable.

[0010] Optionally, the outer ring blades are uniformly arranged vertical blades.

[0011] Optionally, the outer channel is provided with a wind speed regulating ring.

[0012] Optionally, the width of the wind speed regulating ring is adjustable.

[0013] Optionally, the wind speed regulating ring is arranged laterally.

[0014] The novel impeller device of this invention enables efficient separation of pulverized coal and coke, effectively controlling the discharge of coke and improving the utilization rate of coal in power plants. It reduces impeller wear, increases impeller lifespan, and decreases maintenance. It also reduces internal wear in the coal mill, decreasing the frequency of replacement of worn parts and lowering operating and maintenance costs; reduces internal resistance, thus lowering motor power consumption; enhances the uniformity of pulverized coal in the coal mill, improving boiler combustion efficiency, achieving energy conservation, emission reduction, and improved overall power plant performance. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention 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.

[0016] Figure 1 This is a schematic diagram of the system after the installation of the novel flow-diverting impeller device according to an embodiment of the present invention;

[0017] Figure 2 A cross-sectional schematic diagram of a novel flow-diverting impeller device provided in an embodiment of the present invention;

[0018] Figure 3 A cross-sectional schematic diagram of a novel flow-diverting impeller device provided in an embodiment of the present invention from a first angle;

[0019] Figure 4 This is a cross-sectional schematic diagram from a second angle of a novel flow-diverting impeller device provided in an embodiment of the present invention. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the 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 invention without inventive effort are within the scope of protection of the invention.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "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 of this invention is in use. They are only for the convenience of describing this invention 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 invention. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0025] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" 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 invention based on the specific circumstances.

[0026] Please refer to the reference. Figures 1 to 4 , specifically Figure 1As shown in the system diagram, the system includes a flow divider ring, a guard plate, a side body device 201, a wear-resistant liner 301, a separator body 302, a loading gate frame 303, a grinding roller head guard plate 401, a grinding roller 402, an extension ring 501, and a grinding bowl 502.

[0027] The impeller is mounted on the extension ring 501. Coal powder particles ground by the grinding rollers 402 and grinding bowls 502 are conveyed to the top of the impeller. Then, hot air passing through the impeller separates and conveys them. To ensure the impeller has excellent overall performance, a flow divider 104 is used to divide the impeller into an inner ring separation channel (i.e., the inner channel) and an outer ring protection channel (i.e., the outer channel). The inner ring separation channel mainly separates coal powder particles from stone coal, while the outer ring protection channel mainly controls and adjusts the flow rate and protects the main components of the coal mill. The inner ring separation channel receives clean hot air and exits a mixture of air and coal powder, while the outer ring protection channel receives and exits clean hot air.

[0028] like Figure 2 As shown, the novel flow-dividing impeller device provided in this embodiment of the invention includes components such as a wind speed regulating ring 101, outer ring blades 102, outer ring plate 103, flow-dividing plate 104, inner ring blades 105, and inner ring plate 106. The flow-dividing plate 104 is disposed between the outer ring plate 103 and the inner ring plate 106. The main improvement of this invention is that the flow-dividing plate 104 separates the impeller device into the aforementioned inner and outer channels.

[0029] The inner channel is the channel between the inner ring plate 106 and the flow divider plate 104. Only the inner ring blades 105 are uniformly arranged in this channel, and they are all arranged at 45°. Since no airfoil blades or throttling rings are set, the generation of turbulence is eliminated, which can ensure the stability of the flow field of the gas-solid two-phase flow, reduce the wear of the inner ring blades 105, reduce the impeller device resistance, and ensure the uniformity of the impeller outlet velocity.

[0030] The outer channel is the passage between the diverter plate 104 and the outer ring plate 103. The outer ring blades 102 and the wind speed regulating ring 101 are arranged in this channel. The outer ring blades 102 are arranged vertically and evenly. Under the action of impeller rotation, they can suppress the flow of air into the outer ring, thereby increasing the wind speed in the inner channel. The wind speed regulating ring 101 is arranged horizontally and is used to adjust the impeller flow rate. Although the horizontal arrangement will generate some turbulence, the diverter plate 104 will prevent coal powder particles or gravel from entering the outer channel. Therefore, the air passing through is clean hot air, which will not cause additional scouring and wear. Moreover, the clean air will provide a certain degree of protection for the internal components. Combined with the airflow direction of the inner channel, it can reduce abnormal wear on the wear-resistant liner plate, loading door frame and other components of the coal mill.

[0031] The distribution ratio of the inner and outer channels and the width of the wind speed regulating ring 101 can ensure the channel wind speed, thereby enabling efficient separation of coal powder particles and gravel, and effectively controlling the discharge of gravel.

[0032] The above-mentioned new diversion impeller device was manufactured and produced, relying on existing spare parts and modification projects. The device was supplied and installed on-site for testing. Daily operating parameters were collected, and the parameters were summarized, compared and analyzed. Wear inspection was carried out after 6 months of operation. It has been demonstrated that the device can effectively control the discharge of stone coal, reduce the resistance of the impeller device, reduce the wear of the device itself and other parts of the coal mill, and reduce the energy consumption of the coal mill.

[0033] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A novel flow-diverting impeller device, comprising at least a wind speed regulating ring, outer ring blades, an outer ring plate, a flow-diverting plate, inner ring blades, and an inner ring plate, characterized in that, The flow divider is disposed between the outer ring plate and the inner ring plate, and the flow divider separates the impeller device into an inner channel and an outer channel. The inner ring blades are uniformly arranged oblique blades; the outer ring blades are uniformly arranged vertical blades. The top of the splitter plate is higher than the top of the inner ring plate; the bottom of the splitter plate is higher than the bottom of the inner ring plate. The position of the diverter plate is adjustable; The outer channel is equipped with a wind speed regulating ring; the width of the wind speed regulating ring is adjustable and it is arranged horizontally. The inner channel is not equipped with airfoil blades or throttling rings; The inner channel is the channel between the inner ring plate and the splitter plate, and only the inner ring blades are evenly arranged in the channel. The outer channel is the channel between the splitter plate and the outer ring plate, and the outer ring blades and wind speed regulating ring are arranged in the channel. The blades are arranged at a 45° angle.

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