A multi-directional flow field electrostatic precipitator

Abstract

This invention discloses a multi-directional flow field electrostatic separator, belonging to the technical field of powder classification equipment, and used in a coal mill. The static separator includes: an inner cone; an outer cone located circumferentially outside the inner cone, with a mounting plate covering the top of the outer cone above the inner cone; an axial guide vane assembly located at the lower part of the annular space formed by the inner and outer cones, used to guide the axial flow of the air-powder mixture entering the annular space; and a radial guide vane assembly located between the mounting plate and the inner cone, used to guide the radial flow of the air-powder mixture from the axial guide vane assembly. In this application, the radial and axial guide vane assemblies cooperate to guide the radial and axial flow of the air-powder mixture, respectively, enhancing the device's ability to control the fineness and uniformity of coal powder and improving the coal powder separation capacity.

Description

Technical Field

[0001] This invention belongs to the technical field of powder classification equipment and relates to a multi-directional flow field electrostatic separator. Background Technology

[0002] In recent times, with continuous technological advancements and increasingly stringent national and industry requirements for the flexibility of thermal power unit regulation, coal economy, and equipment reliability under capacity pricing mechanisms, higher demands have been placed on boiler combustion efficiency, fly ash carbon content, energy conservation, and environmental protection in positive pressure direct-fired pulverizing systems. Improving the fineness of pulverized coal and the uniformity of coal output from coal mills have gradually become bottlenecks in enhancing boiler combustion efficiency.

[0003] For conventional coal types, such as bituminous coal and lignite, medium-speed vertical coal mills are typically shipped with a static baffle separator. This older type of static separator only has one set of radial guide vanes for screening coal powder, resulting in weak overall separation capacity and insufficient control over the fineness and uniformity of the coal powder. Furthermore, due to structural limitations, adjusting the radial guide vanes in the older static separator is extremely inconvenient. Moreover, the older static separator is located at the top of the coal mill, with the adjustment operation position approximately 5.5 to 10 meters above the ground. During adjustment, technicians need to work at height, relying on handwheels to drive the radial guide vanes to adjust the angle, which is time-consuming, labor-intensive, and poses significant safety risks. As production time increases, problems such as jamming and difficulty in adjusting the radial guide vanes may also occur.

[0004] Therefore, developing a multi-directional flow field separator that takes into account both the fineness and uniformity of pulverized coal has a high market application prospect. Summary of the Invention

[0005] To address the problems of existing static separators, which rely on only one set of radial guide vanes for sieving coal powder, resulting in weak overall separation capacity and insufficient control over coal powder fineness and uniformity, this invention provides the following technical solution: a multi-directional flow field electrostatic separator for use in a coal mill, wherein the static separator comprises: inner cone; An outer cone is located circumferentially outside the inner cone, and a mounting plate located above the inner cone covers the top of the outer cone; An axial guide vane assembly is located at the lower part of the annular space formed by the inner cone and the outer cone. The axial guide vanes are used to guide the axial flow of the air-powder mixture entering the annular space. A radial guide vane assembly is located between the mounting plate and the inner cone, and is used to guide the air-powder mixture from the axial guide vane assembly in a radial flow field.

[0006] Optionally, in the above-described multi-directional flow field electrostatic separator, the static separator further includes: an adjustment ring; Multiple first shaft cylinders are circumferentially spaced on the sidewall of the outer cone; The axial guide vane assembly includes: a plurality of axial guide vanes spaced apart in the annular space, and the axial guide vanes are oscillatingly connected to the adjusting ring located on the circumferential periphery of the outer cone by passing through through holes in the side wall of the outer cone and the horizontal shaft of the first shaft cylinder in sequence; The adjusting ring is used to drive the axial guide vanes to rotate along the horizontal axis.

[0007] Optionally, in the above-mentioned multi-directional flow field electrostatic separator, the regulating ring includes: multiple arc-shaped plates; Multiple of the aforementioned arc-shaped plates are connected by an offset adjustment plate to form a ring; The offset adjustment plate has the same curve as the arc plate, and a plurality of first offset adjustment holes are spaced apart on the offset adjustment plate along the length direction of the offset adjustment plate. The offset adjustment plate is connected to the arc plate by first bolts that pass through the first offset adjustment holes.

[0008] Optionally, in the above-described multi-directional flow field electrostatic separator, the static separator further includes: a first swing arm; The first connecting end of the first swing arm is provided with a first elongated hole along the length direction of the first swing arm, and the first swing arm is connected to the adjustment ring by a second bolt that passes through the horizontal hole on the adjustment ring and the first elongated hole in sequence. The first connecting end of the horizontal shaft is connected to the second connecting end of the first swing arm, and the second connecting end of the horizontal shaft is connected to the axial guide vane.

[0009] Optionally, in the above-described multi-directional flow field electrostatic separator, the static separator further includes: an impact cone; The impact cone is sleeved on the inner cone, which is positioned opposite to the axial guide vane assembly. The longitudinal section of the impact cone located on one side of the inner cone is a right-angled triangle.

[0010] Optionally, in the above-described multi-directional flow field electro-electric static separator, the static separator further includes: a first electro-electric drive structure; The first electro-drive structure includes: a first electro-drive device and a first electric actuator. The first electro-drive device is connected to the first electric actuator and the adjusting ring respectively. The first electro-drive device is used to convert the rotational motion of the first electric actuator into the rotation of the adjusting ring along the axis of the inner cone.

[0011] Optionally, in the above-described multi-directional flow field electro-electric static separator, the static separator further includes: a drive ring; A plurality of second shaft cylinders are arranged at circumferential intervals on the mounting plate; The radial guide vane assembly includes: a plurality of radial guide vanes, the radial guide vanes being oscillatingly connected to the transmission ring located above the mounting plate via a vertical hole passing through the vertical shaft of the second shaft cylinder in sequence; The vertical axis is vertically aligned with the upper edge of the inner cone; The transmission ring is used to drive the radial guide vanes to rotate along the vertical axis.

[0012] Optionally, in the above-described multi-directional flow field electrostatic separator, the static separator further includes: a second swing arm; The first connecting end of the second swing arm has a second elongated hole along the length direction of the second swing arm; The transmission ring is provided with multiple sets of second bias adjustment holes at intervals, and each set of second bias adjustment holes is arranged according to the movement trajectory of the second swing arm; The second swing arm is connected to the transmission ring by a third bolt that passes through the second offset adjustment hole and the second elongated hole in sequence; The first connecting end of the vertical shaft is connected to the second connecting end of the second swing arm, and the second connecting end of the vertical shaft is connected to the radial guide vane; The projection of the radial guide vane falls on the inner wall of the inner cone.

[0013] Optionally, in the above-described multi-directional flow field electro-electric static separator, the static separator further includes: a second electro-electric drive structure; The second electro-drive structure includes: a second electro-drive device and a second electric actuator. The second electro-drive device is connected to the second electric actuator and the transmission ring respectively. The second electro-drive device is used to convert the rotational motion of the second electric actuator into the rotation of the transmission ring along the axis of the inner cone.

[0014] Optionally, in the above-mentioned multi-directional flow field electrostatic separator, the practical adjustment range of both the radial guide vane group and the axial guide vane group is 30° to 90°.

[0015] The beneficial effects of the technical solution provided by the embodiments of the present invention are as follows: This application adds an axial guide vane group to the lower part of the static separator. The axial guide vane group performs the first mixing and swirling of the air-powder mixture, which plays a role in fully distributing the air-powder mixture before it enters the radial guide vane group at the top of the static separator. The radial guide vane group and the axial guide vane group work together to guide the air-powder mixture radially and axially, respectively, thereby enhancing the device's ability to control the fineness and uniformity of coal powder and improving the coal powder separation capacity. This solves the problem of the old static separator having only one set of radial guide vanes to screen the coal powder, resulting in weak overall separation capacity and insufficient control over the fineness and uniformity of coal powder. Attached Figure Description

[0016] Figure 1 A schematic cross-sectional view of a multi-directional flow field electrostatic separator provided in an embodiment of the present invention; Figure 2 A schematic diagram illustrating the working principle of the gas-solid two-phase flow field inside a multi-directional flow field electrostatic separator provided in this embodiment of the invention; Figure 3 A schematic diagram showing the positions of the axial guide vane assembly and the impact cone in a multi-directional flow field electrostatic separator provided in an embodiment of the present invention; Figure 4 A top view of the axial guide vane assembly and regulating ring in a multi-directional flow field electrostatic separator provided in an embodiment of the present invention; Figure 5 for Figure 4 Enlarged view of structure A in the middle; Figure 6 for Figure 4 A schematic diagram of the main structure of structure A in the middle; Figure 7 This is a schematic diagram showing the position of the radial guide vane assembly in a multi-directional flow field electrostatic separator according to an embodiment of the present invention; Figure 8 A top view schematic diagram of the combined structure of the transmission ring and the second swing arm in a multi-directional flow field electrostatic separator provided in an embodiment of the present invention; Figure 9 This is a schematic diagram of the combined structure of the transmission ring and the second swing arm in a multi-directional flow field electrostatic separator provided in an embodiment of the present invention; Figure 10 This is a schematic diagram of the main structure of the first electric drive structure in a multi-directional flow field electric static separator provided in an embodiment of the present invention; Figure 11 This is a top view schematic diagram of the combination of the second electric drive structure and the transmission ring in a multi-directional flow field electric static separator provided by an embodiment of the present invention; Figure 12 for Figure 1Enlarged view of structure B in the middle; Figure 13 A schematic diagram of a horizontal axis, a first swing arm, a second bolt, an arc plate, and an outer cone body provided for an embodiment of the present invention; Figure 14 This is a schematic diagram of the upper structure of a traditional static separator in the prior art; Figure 15 This is a schematic diagram of the lower structure of a traditional static separator in the prior art; In the diagram: 1. Outer cone; 2. Inner cone; 3. Axial guide vane; 4. Adjusting ring; 41. Arc plate; 5. Horizontal shaft; 6. First swing arm; 61. First elongated hole; 7. Offset adjustment plate; 71. First offset adjustment hole; 8. First bolt; 9. Second bolt; 10. Impact cone; 11. Radial guide vane; 12. Transmission ring; 121. Second offset adjustment hole; 13. Vertical shaft; 14. Second swing arm; 15. Second elongated hole; 16. Third bolt; 17. First electric drive device; 170. Second electric drive device ; 171, First drive block; 173, First shift fork; 174, Second shift fork; 175, First drive end; 18, First electric actuator; 180, Second electric actuator; 1710, Second drive block; 1730, Third shift fork; 1740, Fourth shift fork; 19, Distributor; 20, Central coal drop pipe; 21, Ventilation pipe; 22, Mounting plate; 23, First shaft cylinder; 24, Second shaft cylinder; Structure A represents two adjacent arc-shaped plates connected by an offset adjustment plate; Structure B represents axial guide vanes connected to arc-shaped plates by a first swing arm. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0018] In the description of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and do not require the invention to be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention. The terms "connected," "linked," and "set up" used in this invention should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a direct connection or an indirect connection through intermediate components; a wired connection, a radio connection, or a wireless communication signal connection. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0019] Please see Figure 1-12The present invention provides the following technical solution: a multi-directional flow field electrostatic separator for use in a coal mill. The static separator of this application includes: an outer cone 1, an inner cone 2, an axial guide vane group, and a radial guide vane group.

[0020] Among them, see Figure 1 As shown, the centerline of the inner cone 2 coincides with the centerline of the static separator.

[0021] The outer cone 1 is located circumferentially outside the inner cone 2, forming an annular space between the inner cone 2 and the outer cone 1. The outer cone 1 and the inner cone 2 are coaxially arranged. The top of the outer cone 1 is covered by a mounting plate 22 located above the inner cone 2. The mounting plate 22 does not contact the inner cone 2; it is understood that there is a gap between the inner cone 2 and the mounting plate 22. It is generally known to those skilled in the art that the static separator is located at the top of the coal mill. The inclination of the inner cone 2 is less than that of the outer cone 1.

[0022] The axial guide vane assembly is located at the lower part of the annular space formed by the inner cone 2 and the outer cone 1. The axial guide vane is used to guide the axial flow field of the air-powder mixture entering the annular space.

[0023] The radial guide vane assembly is located between the mounting plate 22 and the inner cone 2. The radial guide vane assembly is used to guide the air-powder mixture from the axial guide vane assembly in a radial flow field.

[0024] It should be noted that this application, through flow field simulation and overall structural optimization design, makes the volumetric flow field of the separator more in line with separation requirements.

[0025] See Figure 2 In use, the air-powder mixture, which is the primary air carrying coal powder, flows from the bottom of the annular space formed by the outer cone 1 and the inner cone 2 upward along the axial direction of the static separator. The axial guide vane group agitates the air-powder mixture above, causing it to form a preliminary homogenization and mixing, completing the initial inertial separation of large coal powder particles. After inertial separation, the air-powder mixture continues to flow upward along the primary air passage formed between adjacent axial guide vanes 3 in the axial guide vane group. When the air-powder mixture reaches the upper part of the annular space, the flow direction changes and flows radially from the outside to the inside of the static separator. The radial guide vane group located in the gap between the mounting plate 22 and the inner cone 2 agitates the air-powder mixture in front, and under the action of centrifugal force, the large coal powder particles are centrifugally separated. The small coal powder particles flow into the inner cone 2 along the primary air passage formed between adjacent radial guide vanes 11 in the radial guide vane group.

[0026] This application adds an axial guide vane assembly to the lower part of the static separator to perform initial mixing and swirling of the air-powder mixture. This ensures the air-powder mixture is fully and evenly distributed before entering the radial guide vane assembly at the upper part of the static separator. The radial and axial guide vane assemblies work together to guide the air-powder mixture radially and axially, respectively, enhancing the device's ability to control the fineness and uniformity of pulverized coal, improving the separation capacity of pulverized coal, and solving problems such as... Figure 14 The existing technology shown has the problem that the old-style static separator only has one set of radial guide vanes to screen coal powder, and the lower part of the old-style static separator does not have a baffle, resulting in a weak coal powder separation capacity.

[0027] It is worth mentioning that, since the axial guide vane assembly is located in the low-velocity section at the inlet of the static separator, the scouring wear is small, which can improve the service life of the components and reduce maintenance costs and maintenance workload.

[0028] As a preferred embodiment of the above embodiment, in this embodiment, the static separator further includes an adjusting ring 4. Specifically, a plurality of first shaft cylinders 23 are circumferentially spaced on the side wall of the outer cone 1. The first shaft cylinders 23 are welded to the outer cone 1. Through holes, such as horizontal holes, are opened on the side wall of the outer cone 1 corresponding to the positions of the first shaft cylinders 23. The first shaft cylinders 23 can be disposed in the through holes, or both ends of the first shaft cylinders 23 can protrude out of the through holes, or the outer end of the first shaft cylinders 23 can protrude out of the through holes, with the outer section being the end located outside the static separator. The axial guide vane assembly includes multiple axial guide vanes 3 spaced apart within the annular space formed by the outer cone 1 and the inner cone 2. Each axial guide vane 3 is oscillatingly connected to an adjusting ring 4 located on the outer periphery of the outer cone 1 via a horizontal shaft 5 passing sequentially through a horizontal hole on the side wall of the outer cone 1 and through a horizontal shaft 5 of the first shaft cylinder 23. That is, the axial guide vane 3 is connected to the horizontal shaft 5, which is rotatably positioned within the first shaft cylinder 23. The outer end of the horizontal shaft 5 is oscillatingly connected to the adjusting ring 4. Thus, when the adjusting ring 4 rotates circumferentially, the horizontal shaft 5 rotates under its influence, causing each axial guide vane 3 to rotate along the horizontal shaft 5 at its location, achieving coordinated rotation of multiple axial guide vanes 3. It should be noted that... Figure 1 In the image shown, the axial guide vane 3 can rotate back and forth along the horizontal axis 5. When the uniformity of the pulverized coal is not up to standard or the pressure of the airflow is uneven, the angle of the axial guide vane 3 can be adjusted until the uniformity index is qualified.

[0029] As an embodiment of the specific structure of the aforementioned regulating ring 4, in this embodiment, the regulating ring 4 includes: multiple arc-shaped plates 41, with a gap between adjacent arc-shaped plates 41, and the multiple arc-shaped plates 41 forming a discontinuous ring. Correspondingly, the horizontal axis 5 of the first shaft cylinder 23 is oscillatingly connected to the arc-shaped plates 41 located on the outer periphery of the outer cone 1, that is, when the arc-shaped plates 41 rotate circumferentially, they drive the axial guide vanes 3 corresponding to the arc-shaped plates 41 to rotate along the horizontal axis 5. With this arrangement, each arc-shaped plate 41 can be controlled individually, realizing the regional control of the axial guide vanes 3, which is divided according to the arc-shaped plates 41.

[0030] As an embodiment of the specific structure of the aforementioned adjusting ring 4, in this embodiment, the adjusting ring 4 includes: multiple arc-shaped plates 41, with a gap between adjacent arc-shaped plates 41. Specifically, as shown... Figure 4 and Figure 5 As shown, multiple arc-shaped plates 41 are connected to form a ring via an offset adjustment plate 7. Specifically, multiple arc-shaped plates 41 are connected to form a ring, and adjacent arc-shaped plates 41 are connected via the offset adjustment plate 7. The number of arc-shaped plates 41 can be flexibly set according to actual needs; typically, three plates are sufficient. The curve of the offset adjustment plate 7 is consistent with that of the arc-shaped plates 41. Figure 6 As shown, a plurality of first bias adjustment holes 71 are spaced apart on the bias adjustment plate 7 along its length. Figure 5As shown, the offset adjustment plate 7 is connected to the arc-shaped plate 41 via a first connector, such as a first bolt 8, that passes through the first offset adjustment hole 71. In this application, the adjustment ring 4 is a split ring. Reserved offset adjustment positions are provided on the offset adjustment plates 7 between the arc-shaped plates 41. According to the flow field adjustment requirements, multiple axial guide vanes 3 on a designated arc-shaped plate 41 can exhibit different angle offset capabilities during the linkage adjustment process compared to the axial guide vanes 3 on other arc-shaped plates 41. In other words, the axial guide vanes 3 achieve regional offset adjustment capabilities through the adjustment ring 4. It should be noted that the angles of the multiple axial guide vanes 3 on each arc-shaped plate 41 are consistent. Furthermore, before the "linkage adjustment" mentioned in this embodiment, the designated arc-shaped plate 41 needs to be disconnected from the offset adjustment plates 7 on both sides. After the "linkage adjustment" is completed, the first bolt 8 is inserted into the first offset adjustment hole 71 at the designated position to reconnect the arc-shaped plate 41 to the offset adjustment plates 7 on both sides. Once the multiple arc-shaped plates 41 are connected as a whole, during the linkage rotation, all the axial guide vanes 3 rotate synchronously together according to the initially set offset angle. Taking a case with five first offset adjustment holes 71 as an example, the offset adjustment of a certain arc-shaped plate 41 will be explained. The five first offset adjustment holes 71 are numbered sequentially as: first hole, second hole, third hole, fourth hole, and fifth hole. Before offset adjustment, for a certain arc-shaped plate 41, it is connected to two adjacent arc-shaped plates 41 through the third hole on the offset adjustment plate 7. After offset adjustment, it may be connected in a counterclockwise direction to the arc-shaped plate 41 in front through the first hole on the offset adjustment plate 7, and to the arc-shaped plate 41 behind through the fifth hole on the offset adjustment plate 7. The adjustment ring 4 and the transmission ring 12 described below mainly play the role of offset adjustment capability to correct and homogenize parameters such as airflow pressure and coal powder concentration as much as possible.

[0031] To achieve the swing connection between the horizontal shaft 5 and the adjusting ring 4, the static separator also includes a first swing arm 6. Specifically, the first connecting end of the first swing arm 6 has a first elongated hole (not shown in the figure, but its shape can be referred to) along the length direction of the first swing arm 6. Figure 8 The second elongated hole 15 in the first elongated hole), the first swing arm 6 is connected to the adjusting ring 4 by a second connecting piece, such as a bolt 9, which passes through the through hole on the adjusting ring 4 (specifically the arc plate 41) and the first elongated hole in sequence. Figure 1In the diagram, when the adjusting ring 4 rotates, it drives the second bolt 9 to rotate, causing the position of the second bolt 9 within the first elongated hole 61 to change. Under the influence of the adjusting ring 4, the first swing arm 6 can swing back and forth. The first connecting end of the horizontal shaft 5 is connected to the second connecting end of the first swing arm 6, and the second connecting end of the horizontal shaft 5 is connected to the axial guide vane 3. Thus, under the influence of the first swing arm 6, the axial guide vane 3 can rotate along the horizontal shaft 5, achieving the guiding effect of the flow field in different directions. It should be noted that the axial guide vane 3 is indirectly connected to the adjusting ring 4 through the first swing arm 6, achieving self-locking and preventing it from rotating due to a single breeze.

[0032] Before use, a preset angle is set for the axial guide vane 3. Initially, the first swing arm 6 is vertically positioned, and the axial guide vane 3 is tilted to the upper right relative to the vertical direction. The angle between the axial guide vane 3 and the vertical direction is 17°-22°, for example, 17°, 18°, 19°, 20°, 21°, or 22°. Figure 1 In the image shown, when the adjusting ring 4 is rotated clockwise along the axis of the inner cone 2, the first swing arm 6 swings forward under the influence of the adjusting ring 4. At the same time, the first swing arm 6 drives the axial guide vane 3 to rotate forward through the horizontal shaft 5, and the axial guide vane 3 gradually becomes more vertical. Conversely, when the adjusting ring 4 is rotated counterclockwise along the axis of the inner cone 2, the first swing arm 6 swings backward under the influence of the adjusting ring 4. At the same time, the first swing arm 6 drives the axial guide vane 3 to rotate backward through the horizontal shaft 5, and the angle between the axial guide vane 3 and the vertical direction gradually increases.

[0033] To enhance the disturbance force on the air-powder mixture within the axial flow field, in this embodiment, the static separator further includes an impact cone 10. Specifically, the impact cone 10 is an annular cavity structure, which is sleeved on the inner cone 2 opposite to the position of the axial guide vane assembly. Figure 2In the diagram shown, the longitudinal section of the impact cone 10 located on one side of the inner cone 2 is a right-angled triangle. The horizontal bottom surface of the impact cone 10 can further agitate the air-coal mixture that has just entered the static separator, which is beneficial for the homogenization and mixing of the air-coal mixture and the inertial separation of large coal particles. In addition, multiple axial guide vanes 3 are spaced apart in the annular area enclosed by the vertical outer wall of the impact cone 10 and the inner wall of the outer cone 1. That is, the axial guide vanes 3 are positioned between the throat formed by the impact cone 10 and the outer cone 1, and the axial guide vanes 3 are located at the lower part of the annular space formed by the inner cone 2 and the outer cone 1. When the axial guide vanes 3 rotate, they will not interfere with the impact cone 10. Therefore, the axial guide vanes 3 near the air inlet can play a good guiding role for the air-coal mixture. In this application, the gap between the impact cone 10 and the axial guide vanes 3 is small, ensuring the continuity of the flow field. The bottom of the impact cone 10 is connected to the ventilation pipe 21 of the coal mill, which penetrates into the outer cone 1, via a pipe, thus giving the impact cone 10 a ventilation function. It is worth noting that the clean air supplied by the ventilation pipe 21 for sealing does not affect the flow field within the static separator; it is merely for maintaining... Figure 14 The ventilation function of the old-style static separator in the prior art is shown. In order to improve the flow guiding effect, the axial guide vanes 3 are enveloped in the annular flow channel formed between the annular vertical surface of the impact cone 10 and the inner wall surface of the outer cone 1.

[0034] To replace manual operation of the adjusting ring 4, the static separator also includes a first electro-optical drive structure. See details... Figure 10 As shown, the first electro-hydraulic drive structure includes a first electro-hydraulic drive device 17 and a first electric actuator 18. The first electro-hydraulic drive device 17 is connected to the first electric actuator 18 and the adjusting ring 4. The first electro-hydraulic drive device 17 is used to convert the rotational motion of the first electric actuator 18 into the rotation of the adjusting ring 4 along the axis of the inner cone 2. In this way, the adjusting ring 4 can drive the corresponding axial guide vanes 3 to rotate along the horizontal axis 5 at their respective positions, realizing the linkage rotation of the axial guide vanes 3. The first electric actuator 18 can be a motor, and the first electro-hydraulic drive device 17 can be a lead screw and nut mechanism. The rotation of the motor drives the lead screw of the lead screw and nut mechanism connected to it to rotate, which in turn drives the drive block 171 of the lead screw and nut mechanism to move linearly along the lead screw. The drive block 171 extends away from the lead screw to form a first drive end 175, which cooperates with two forks provided on the adjusting ring 4: a first fork 173 and a second fork 174, thereby driving the adjusting ring connected to the two forks to rotate. Two shift forks are spaced apart circumferentially along the adjusting ring 4. One end of each fork is connected to the adjusting ring 4, and the other end extends away from the adjusting ring 4, with the distance between the fork and the adjusting ring 4 being greater than the distance between the first driving end and the adjusting ring 4. The first driving end is located between the two shift forks. The diameter of the first driving end is smaller than the diameter of the driving block, thereby forming an annular groove at the first driving end.

[0035] The static separator also includes a drive ring 12, which enables the coordinated rotation of all radial guide vanes 11. Specifically, the drive ring 12 is located above the mounting plate. Multiple second shaft cylinders 24 are spaced circumferentially on the mounting plate 22, welded to it. Vertical holes are formed on the mounting plate 22 opposite to the positions of the second shaft cylinders 24. The radial guide vane assembly includes multiple radial guide vanes 11. Each radial guide vane 11 is oscillatingly connected to the drive ring 12 via a vertical shaft 13 passing sequentially through the vertical holes on the mounting plate 22 and the second shaft cylinders 24. The vertical shaft 13 is vertically aligned with the upper edge of the inner cone 2. Driven by the drive ring 12, each radial guide vane 11 rotates along its vertical shaft 13, achieving coordinated rotation of all radial guide vanes 11. When the coal powder is too coarse, the angle of the radial guide vanes 11 can be adjusted until the coal powder fineness meets the standard.

[0036] To achieve the swing connection between the vertical shaft 13 and the transmission ring 12, the static separator in this embodiment further includes a second swing arm 14. Specifically, the first connecting end of the second swing arm 14 has a second elongated hole 15 along its length. The transmission ring 12 has multiple sets of second offset adjustment holes 121 spaced apart. See also... Figure 8 As shown, each set of second offset adjustment holes 121 is arranged according to the movement trajectory of the second swing arm 14, that is, holes are spaced apart on the transmission ring 12 according to the actual movement trajectory of the second swing arm 14 in use. The second swing arm 14 is connected to the transmission ring 12 by a third bolt 16 passing through the second offset adjustment hole 121 and the second elongated hole 15 in sequence, thus... Figure 1 In the diagram, when the transmission ring 12 rotates, the position of the third bolt 16 within the second elongated hole 15 changes, allowing the second swing arm 14 to swing back and forth under the drive of the transmission ring 12. The first connecting end of the vertical shaft 13 is connected to the second connecting end of the second swing arm 14, and the second connecting end of the vertical shaft 13 is connected to the radial guide vane 11. Thus, under the drive of the second swing arm 14, the radial guide vane 11 can rotate along the vertical shaft 13. Notably, the projection of the radial guide vane 11 falls on the inner wall of the inner cone 2. Thus, the radial guide vane 11, fixedly connected to the vertical shaft 13, is located at the air inlet of the radial flow field of the static separator, providing excellent radial guidance for the air-powder mixture. This application achieves the offset adjustment capability of the radial guide vane group by connecting all the second swing arms 14 to different positions in each group of second offset adjustment holes 121 on the transmission ring 12. It should be noted that the radial guide vane 11 can be individually offset by an angle according to actual needs, but during linkage, all radial guide vanes 11 rotate together. In addition, the radial guide vane 11 is indirectly connected to the transmission ring 12 through the second swing arm 14, achieving self-locking and preventing it from being blown around by a single gust of wind.

[0037] To replace manual operation of the drive ring 12, the static separator also includes a second electric drive structure. See details... Figure 10 As shown, the second electro-optic drive structure includes: a second electro-optic drive device and a second electric actuator. (See also...) Figure 11 As shown, the second electro-hydraulic drive device is connected to the second electric actuator and the transmission ring 12. The second electro-hydraulic drive device is used to convert the rotational motion of the second electric actuator into the rotation of the transmission ring 12 along the axis of the inner cone 2. In this way, the transmission ring 12 can drive all the radial guide vanes 11 to rotate along the vertical axis 13 at their respective positions, realizing the linkage rotation of all the radial guide vanes 11. It should be noted that the addition of "first" and "second" in the names of the electro-hydraulic drive device and the electric actuator is only for easy distinction of their positions; their structures can be the same. Specifically, the second electric actuator 180 can be a motor, and the second electro-hydraulic drive device 170 can be a lead screw and nut mechanism. The rotation of the motor drives the lead screw of the lead screw and nut mechanism connected to it to rotate, which in turn drives the drive block 1710 of the lead screw and nut mechanism to move linearly along the lead screw. The drive block 1710 extends away from the lead screw to form a second drive end, which cooperates with two shift forks provided on the transmission ring 12: the third shift fork 1730 and the fourth shift fork 1740, thereby driving the transmission ring 12 connected to the two shift forks to rotate. Two shift forks are spaced apart along the circumference of the transmission ring 12. One end of each shift fork is connected to the transmission ring 12, and the other end extends away from the transmission ring 12. The distance between the shift fork and the transmission ring 12 is greater than the distance between the second drive end and the transmission ring 12. The second drive end is located between the two shift forks.

[0038] This application sets an electric drive structure at the driving positions of the adjusting ring 4 of the radial guide vane group and the transmission ring 12 of the axial guide vane group in the static separator, so that the two groups of guide vane groups have remote and rapid adjustment capabilities. The actual working practical adjustment range is 30° to 90°, such as 30°, 40°, 50°, 60°, 70°, 80°, 90°, or other values ​​within this range, which can effectively improve the separator's ability to adjust and control the fineness of coal powder.

[0039] The electric drive structure formed by connecting the electric drive unit and the electric actuator, also known as an intelligent integrated electric drive, adopts an integrated remote intelligent control and adjustment mode. Personnel can remotely control the DCS from the control room based on angular position measurements. It can also link control commands with the coal feeder and primary air system, achieving intelligent adjustment under all operating conditions. Compared to… Figure 14 and Figure 15As shown, in the prior art, the old-style static separator adjusts the angle of the radial blades by manually rotating a handwheel. This application has a faster response speed, and personnel do not need to climb to the top of the static separator for high-altitude operation, thus improving safety. It should be noted that in the event of a power outage due to a malfunction of the electric actuator, i.e., the electric actuator 18, manual adjustment can still be performed via a bridging mechanical drive device to ensure operational reliability.

[0040] See Figure 1 As shown, the static separator also includes a distributor 19. Specifically, the distributor 19 is located above the outer cone 1, and a central coal drop pipe 20 is installed inside the distributor 19. The lower part of the distributor 19 extends into the inner cone 2 after passing through the mounting plate 22. Multiple radial guide vanes 11 in the radial guide vane group are located on the circumferential periphery of the distributor 19. By adjusting the rotation angle of the radial guide vanes 11, the airflow rotation velocity is increased, making it less likely for the airflow to leave the distributor 19. This allows for the centrifugal separation of finer coal powder particles. Finally, the qualified small coal powder particles processed by the radial guide vanes 11 exit the static separator from the distributor 19 with the airflow.

[0041] The specific adjustment and operation methods for the multi-directional flow field electrostatic separator are as follows: When the coal mill starts, the radial guide vanes 11 and axial guide vanes 3 of the separator are positioned at a reference 45° angle. The expected coal feed rate, loading force, and appropriate primary air volume, among other mill operating parameters, are set. After the equipment and system have stabilized for 10 minutes, preliminary sampling and testing are performed. If the coal powder fineness is too coarse, the radial guide vanes 11 are adjusted until the fineness meets the standard, while simultaneously observing the uniformity index. If the standard is not met, the axial guide vanes 3 are adjusted until the index is within acceptable limits.

[0042] During adjustment, it is important to note that both sets of guide vanes should be closed to a smaller value for better performance, while opening them to a larger value will reduce performance. During adjustment, it is essential to ensure that parameters such as the coal mill's ventilation resistance and main motor current do not exceed specified limits, and that the material layer is in a relatively intermediate position, with stable equipment operation. The guide vane angle should not be closed too small while still meeting the specified parameters, as this will limit the coal mill's adjustment tolerance and increase unnecessary power consumption and wear.

[0043] When used in conjunction with the adjustment of a coal mill, this invention can greatly improve the balance and uniformity of each coal powder branch pipe, which is beneficial to the uniform distribution of coal powder in the pipeline and the control of coal powder fineness, thereby reducing the combustible carbon content and NOx emissions in fly ash.

[0044] As is known from common technical knowledge, this invention can be implemented through other embodiments that do not depart from its spirit or essential characteristics. Therefore, the disclosed embodiments described above are merely illustrative in all respects and are not the only ones. All modifications within the scope of this invention or its equivalents are included in this invention.

Claims

1. A multi-directional flow field electrostatic separator for use in a coal mill, characterized in that, The static separator includes: inner cone; An outer cone is located circumferentially outside the inner cone, and a mounting plate located above the inner cone covers the top of the outer cone; An axial guide vane assembly is located at the lower part of the annular space formed by the inner cone and the outer cone. The axial guide vanes are used to guide the axial flow of the air-powder mixture entering the annular space. A radial guide vane assembly is located between the mounting plate and the inner cone, and is used to guide the air-powder mixture from the axial guide vane assembly in a radial flow field.

2. The multi-directional flow field electrostatic separator according to claim 1, characterized in that, The static separator further includes: an adjustment ring; Multiple first shaft cylinders are circumferentially spaced on the sidewall of the outer cone; The axial guide vane assembly includes: a plurality of axial guide vanes spaced apart in the annular space, and the axial guide vanes are oscillatingly connected to the adjusting ring located on the circumferential periphery of the outer cone by passing through through holes in the side wall of the outer cone and the horizontal shaft of the first shaft cylinder in sequence; The adjusting ring is used to drive the axial guide vanes to rotate along the horizontal axis when the adjusting ring rotates circumferentially.

3. The multi-directional flow field electrostatic separator according to claim 2, characterized in that, The adjusting ring includes: multiple arc-shaped plates spaced apart, wherein when the arc-shaped plates rotate circumferentially, they drive axial guide vanes corresponding to the arc-shaped plates to rotate along the horizontal axis; or Multiple curved plates spaced at intervals; Multiple of the aforementioned arc-shaped plates are connected by an offset adjustment plate to form a ring; The offset adjustment plate has the same curve as the arc plate, and a plurality of first offset adjustment holes are spaced apart on the offset adjustment plate along the length direction of the offset adjustment plate. The offset adjustment plate is connected to the arc plate through a first connector that passes through the first offset adjustment hole.

4. The multi-directional flow field electrostatic separator according to claim 2, characterized in that, The static separator further includes: a first swing arm; The first connecting end of the first swing arm is provided with a first elongated hole along the length direction of the first swing arm, and the first swing arm is connected to the adjustment ring by a second connecting piece that passes through the horizontal hole on the adjustment ring and the first elongated hole in sequence. The first connecting end of the horizontal shaft is connected to the second connecting end of the first swing arm, and the second connecting end of the horizontal shaft is connected to the axial guide vane.

5. The multi-directional flow field electrostatic separator according to claim 1, characterized in that, The static separator further includes: an impact cone; The impact cone is sleeved on the inner cone, which is positioned opposite to the axial guide vane assembly. The longitudinal section of the impact cone located on one side of the inner cone is a right-angled triangle.

6. The multi-directional flow field electrostatic separator according to claim 2, characterized in that, The static separator further includes: a first electric drive structure; The first electro-drive structure includes: a first electro-drive device and a first electric actuator. The first electro-drive device is connected to the first electric actuator and the adjusting ring respectively. The first electro-drive device is used to convert the rotational motion of the first electric actuator into the rotation of the adjusting ring along the axis of the inner cone.

7. The multi-directional flow field electrostatic separator according to claim 1, characterized in that, The static separator further includes: a drive ring; A plurality of second shaft cylinders are arranged at circumferential intervals on the mounting plate; The radial guide vane assembly includes: a plurality of radial guide vanes, the radial guide vanes being oscillatingly connected to the transmission ring located above the mounting plate via a vertical hole passing through the vertical shaft of the second shaft cylinder in sequence; The vertical axis is vertically aligned with the upper edge of the inner cone; The transmission ring is used to drive the radial guide vanes to rotate along the vertical axis.

8. The multi-directional flow field electrostatic separator according to claim 7, characterized in that, The static separator further includes: a second swing arm; The first connecting end of the second swing arm has a second elongated hole along the length direction of the second swing arm; The transmission ring is provided with multiple sets of second bias adjustment holes at intervals, and each set of second bias adjustment holes is arranged according to the movement trajectory of the second swing arm; The second swing arm is connected to the transmission ring by a third bolt that passes through the second offset adjustment hole and the second elongated hole in sequence; The first connecting end of the vertical shaft is connected to the second connecting end of the second swing arm, and the second connecting end of the vertical shaft is connected to the radial guide vane; The projection of the radial guide vane falls on the inner wall of the inner cone.

9. The multi-directional flow field electrostatic separator according to claim 7, characterized in that, The static separator further includes: a second electric drive structure; The second electro-drive structure includes: a second electro-drive device and a second electric actuator. The second electro-drive device is connected to the second electric actuator and the transmission ring respectively. The second electro-drive device is used to convert the rotational motion of the second electric actuator into the rotation of the transmission ring along the axis of the inner cone.

10. The multi-directional flow field electrostatic separator according to claim 1, characterized in that, The practical adjustment range of both the radial guide vane group and the axial guide vane group is 30° to 90°.

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