Coal powder flow regulating valve of wind powder pipeline and valve plate thereof

Abstract

The present application relates to a kind of coal powder flow regulating valve of wind powder pipeline and its valve plate, including valve body, define the axis of valve body extends along front-back direction, valve body is cylindrical structure, the left and right radial sides of the valve body are equipped with bearing seat, the valve body is arranged with the valve plate that bearing seat rotates and cooperates, the valve plate is reciprocated and turns around the radial axis of valve body left and right direction to adjust the opening of valve body, the valve body is equipped with the driving structure for driving the valve plate reciprocated and turns, the valve plate includes plate body, the center position of plate body is equipped with front-back through center flow hole, the outer side wall of the valve plate has interval with the valve body, the interval gradually increases from the left and right sides of valve body to middle direction, the valve plate is arranged with comb long hole on the two sides of turning axis, the extension direction of the comb long hole is perpendicular to the turning axis of the valve plate.Avoid the impact on the side wall of valve body, reduce the strong wear of the inner side wall of valve body, prolong the service life of valve body.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pulverizing system, in particular to a coal powder flow regulating valve of a wind-powder pipeline and a valve plate thereof. BACKGROUND

[0002] The existing technology is that the coal mill and several coal powder pipelines connected therewith constitute a pulverizing system, which is responsible for grinding raw coal into qualified coal powder and conveying the coal powder to a boiler for combustion. The coal powder distribution of each conveying pipeline of the pulverizing system is unbalanced, the powder deviation of each branch pipe is large, and the wind-coal ratio deviation is large, which causes the wind-powder in the coupler to not be fully mixed, the combustion condition to be not ideal, the load response to be slow, the combustible material in the furnace to be high, the wind-powder in each branch pipe to be uneven, and the rope-winding phenomenon to occur. If the air and coal powder in the layered state enter the burner, the flame will be unstable, the combustion will be uneven, the unburned carbon will increase, the slagging and scouring of the furnace wall will occur, and the imbalance of CO and O2 will occur.

[0003] Improving the balance of the coal powder distribution of each conveying pipeline of the pulverizing system and the uniformity of the wind-powder in the branch pipe is the basis of other combustion adjustment control.

[0004] A coal powder flow regulating valve of a boiler wind-powder pipeline and a control method thereof are disclosed in the Chinese patent application file with the application number CN112128394A. The regulating valve disclosed in the file includes a valve body, a driving mechanism installed on the valve body shell, a double comb tooth valve plate rotatably connected in the valve body, bearing seats installed on the valve body and located on both sides of the double comb tooth valve plate, and the double comb tooth valve plate is composed of a central plug plate and a comb plate integrally formed with the central plug plate. The central plug plate is located at the center position of the comb plate, and the gap between the combs of the comb plate is used for passing through the coal powder. The regulating method is applied to each coal powder branch pipe, and under the joint action of the coal powder flow rebounded by the central plug plate and the newly incoming coal powder flow, a relatively large wind-powder concentration area is formed in the front cavity. When the coal powder concentration of the coal powder pipeline is larger than that of other coal powder pipelines, the angle of the valve plate is reduced to reduce the entry of the coal powder amount, thereby reducing the coal powder concentration of the coal powder pipeline. Conversely, the angle of the valve plate is increased to increase the entry of the coal powder amount. The double combs of the regulating valve can break the common coal powder rope flow form in the coal powder pipeline, so that the coal powder in the coal powder pipeline is more evenly distributed.

[0005] But in the actual use process, it is found that the regulating valve has the following problems: (1) due to the tooth structure on both sides of the double comb valve and the structure design of the center blocking plate of the valve plate, when the pulverized coal passes through the regulating valve, after the inclined reversing and rebounding of the valve plate, the pulverized coal will flow along the extension direction of the valve plate towards the side wall of the valve body, although due to the small gap of the comb plate, the amount of pulverized coal passing through per unit time is limited, which can effectively transport part of the pulverized coal to the back side of the valve plate, but the pulverized coal transported from the gap between the teeth of the valve plate has a large flow rate and an angle between the flow direction and the side wall of the valve body, so that the pulverized coal directly flows obliquely towards the side wall of the rear cavity of the valve body after being transported from the gap between the teeth, and impacts on the side wall of the valve body, forming several comb-shaped scouring gaps on the side wall of the valve body, causing great wear on the side wall of the valve body, and even causing the side wall of the valve body to break and the powder to leak, directly affecting the subsequent process; (2) the outer diameter of the valve plate and the inner diameter of the valve body are both circular structures, and the sizes are basically matched, so that when the valve plate is opened and closed at a set angle relative to the valve body, the distance between the edge of the valve plate and the valve body is small, thereby causing great resistance when the pulverized coal passes through the gap between the valve body and the valve plate, and the flow rate of the pulverized coal parallel to the side wall of the valve body is small, and the flow rate of the pulverized coal towards the side wall of the valve body is large, thereby greatly increasing the scouring marks of the pulverized coal on the side wall of the valve body, further causing scouring and wear on the side wall of the valve body. SUMMARY

[0006] The purpose of the present application is to provide a pulverized coal flow regulating valve for a wind powder pipeline, to solve the problem that the structure design defect of the valve plate of the regulating valve in the prior art causes scouring and wear on the side wall of the valve body when the pulverized coal passes through the valve plate, thereby causing the valve body to break and leak powder; the purpose of the present application is also to provide a valve plate for the flow regulating valve.

[0007] In order to solve the above problems, the pulverized coal flow regulating valve for a wind powder pipeline according to the present application adopts the following technical scheme:

[0008] The pulverized coal flow regulating valve for a wind powder pipeline comprises a valve body, the axis of the valve body extends in the front-rear direction, the valve body is a cylindrical structure, bearing seats are arranged on the left and right radial sides of the valve body, the valve plate is arranged in rotating cooperation with the bearing seats, the valve plate reciprocally flips around the radial axis extending in the left-right direction of the valve body to adjust the opening degree of the valve body, a driving structure for driving the valve plate to reciprocally flip is arranged on the valve body, the valve plate comprises a plate body, a center flow-through hole passing through the front and rear of the plate body is arranged at the center position of the plate body, there is a gap between the outer side wall of the valve plate and the valve body, the gap gradually increases from the left and right sides of the valve body to the middle direction, comb-shaped long holes are arranged on both sides of the flipping axis of the valve plate, and the extension direction of the comb-shaped long holes is perpendicular to the flipping axis of the valve plate.

[0009] Further, the valve plate is an oval plate, and the long side extension line of the oval plate is consistent with the overturning axis of the valve plate.

[0010] Further, the center flow-through hole is a special-shaped hole with a circular center and a plurality of tooth grooves in a circular array on the side wall.

[0011] Further, the valve plate is arranged with flow guide plates on the left and right sides of the center flow-through hole, and the extension direction of the flow guide plates is parallel to the comb tooth long hole.

[0012] Further, the flow guide plate is a strip-shaped plate structure detachably connected to the valve plate through a screw.

[0013] The valve plate of the flow regulating valve comprises a plate body, and the left and right ends of the plate body are arranged with connecting parts for connecting with support shafts on a bearing seat to make the valve plate reciprocate and overturn around the axis of the support shafts, and a center flow-through hole penetrating through the front and back of the plate body is arranged at the center position of the plate body, the distance between the outer contour edge line of the valve plate and the position of the axis of the center flow-through hole gradually decreases from the left and right ends to the middle position, and comb tooth long holes are arranged on the left and right sides of the overturning axis of the valve plate, and the extension direction of the comb tooth long holes is perpendicular to the overturning axis of the valve plate.

[0014] Further, the valve plate is an oval plate, and the long side extension line of the oval plate is consistent with the overturning axis of the valve plate.

[0015] Further, the center flow-through hole is a special-shaped hole with a circular center and a plurality of tooth grooves in a circular array on the side wall.

[0016] Further, the valve plate is arranged with flow guide plates on the left and right sides of the center flow-through hole, and the extension direction of the flow guide plates is parallel to the comb tooth long hole.

[0017] Further, the flow guide plate is a strip-shaped plate structure detachably connected to the valve plate through a screw.

[0018] The beneficial effects of the present application are as follows: compared with the prior art, the pulverized coal flow regulating valve of the present application can collect the flow parameters in the valve body in the actual use process after the pulverized coal flows into the valve body, and the driving mechanism can control the overturning inclination angle of the valve plate in real time, so as to adjust the opening degree of the valve, and when the pulverized coal flows through the regulating valve, part of the pulverized coal is blocked and rebounds towards the direction along the inclination of the valve plate, while the other part of the pulverized coal continues to be transported to the rear cavity through the center flow-through hole, so as to ensure the minimum conveying flow of the pulverized coal and avoid the problem that all the pulverized coal can only be conveyed through the gap between the valve plate and the valve body to cause too small flow.

[0019] Further, the coal powder flows on the valve plate, and forms a region with a larger concentration on the front side of the valve plate under the joint action of the newly incoming coal powder. At this time, the cross-sectional area of the gap between the valve plate and the valve body is much smaller than the inner diameter of the valve body, so the amount of coal powder passing through the gap between the valve body and the valve plate is reduced, realizing flow regulation. Meanwhile, the through design of the comb long hole reasonably satisfies the flow control in the valve body while avoiding large-scale adjustment of the opening of the valve plate. That is, through the center flow hole, the gap between the valve body and the valve plate, and the structure of the comb long hole, the balanced flow value after adjustment can be satisfied when the coal powder passes through, and large-scale adjustment of the valve plate can be avoided, the structure is more stable, and the adjustment precision is higher.

[0020] Further, the valve plate is designed to have a gradual structure with a large middle part and small two side parts in the gap between the valve plate and the valve body. This is mainly to adapt to the flow form of the coal powder on the valve plate. When the valve plate is inclined around the tilting axis, the length of the middle part of the valve plate is the longest, the conveying path of the coal powder at this position is the longest, the flow speed is the highest, and the two sides are the second. This will make the impulse of the coal powder carried at each position of the edge of the valve plate inconsistent. The arrangement of the gap with a narrow middle part and two narrow side parts can better adapt to the good and stable passing of coal powder with different impulses.

[0021] Further, due to the setting of the initial gap, the conveying flow of the coal powder in the direction balanced to the axis of the valve body is increased, and the direct impact of the coal powder conveyed from the inclined valve plate on the side wall of the valve body is greatly reduced. The setting of the center flow hole reduces the conveying amount of the coal powder in the inclined direction of the valve plate surface, further reducing the impact of the coal powder on the side wall of the valve body. The setting of the comb long hole is that when the coal powder is conveyed along the inclined surface of the valve plate, the coal powder between the combs is conveyed to the rear side after reaching the comb long hole. At this time, most of the coal powder is blocked by the outside side wall of the comb long hole and impacted by the newly incoming coal powder, which weakens the impact speed in the inclined direction, so that the further impact of the coal powder on the side wall after passing through the comb long hole of the valve plate can be further reduced. The coal powder flow in the valve body can be regulated, and the impact on the side wall of the valve body is greatly avoided, the strong wear of the inner side wall of the valve body is reduced, and the service life of the valve body is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced as follows:

[0023] Figure 1 is a specific embodiment structure diagram of the coal powder flow regulating valve of the wind powder pipeline of the present application;

[0024] Figure 2 is Figure 1 A-A sectional view of

[0025] Figure 3 For Figure 1 the plan view of the valve plate;

[0026] Figure 4 For Figure 1 the valve body cross-sectional fluid flow direction schematic in

[0027] BRIEF DESCRIPTION OF DRAWINGS 1-valve body; 2-valve plate; 3-bearing seat; 4-support shaft; 5-pressure ball bearing; 6-outer shell; 7-sealing shell; 8-plate body; 9-central flow-through hole; 10-comb tooth long hole; 11-guide vane; 12-mounting groove; 13-spacing; 14-clip plate; 15-intermediate sleeve; 16-tapered sleeve portion. DETAILED DESCRIPTION

[0028] In order to make the technical objects, technical solutions and beneficial effects of the present application clearer, the technical solutions of the present application will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application, i.e., the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. The components of the embodiments of the present application generally described and shown in the accompanying drawings can be arranged and designed in various different configurations.

[0029] It should be noted that the relationship terms such as "first" and "second" and the like that can appear are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any actual relationship or order between the entities or operations. Moreover, terms such as "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the elements defined by the statement "including a" or the like do not exclude the process, method, article or device including the elements from the process, method, article or device.

[0030] In the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" that can appear should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood through specific circumstances.

[0031] In the description of the present application, it is necessary to point out that, unless otherwise explicitly specified and limited, the term "provided with" that can occur should be understood in a broad sense, for example, the object "provided with" can be a part of the body, or can be arranged separately from the body and connected to the body, and the connection can be detachable or non-detachable. For those skilled in the art, the specific meaning of the above-mentioned term in the present application can be understood according to the specific circumstances.

[0032] The present application will be further described in detail below in combination with embodiments.

[0033] The specific embodiment of the pulverized coal flow regulating valve of the pulverized coal pipeline according to the present application is shown in the figure, and the regulating valve is used to be connected to the pulverized coal pipeline of the coal mill, and the two ends are connected to the pulverized coal pipeline through flanges. Specifically, the regulating valve comprises a valve body 1, a driving mechanism (not shown in the figure) mounted on the valve body 1, a valve plate 2 rotatably assembled on the valve body 1, bearing seats 3 mounted on the radial sides of the valve body 1, etc.

[0034] The valve body 1 comprises an outer shell 6 and a sealing shell 7 embedded and attached to the inner wall of the outer shell, and the two ends of the outer shell 6 are provided with flanges. The valve body 1 is a cylindrical structure as a whole, comprising a middle sleeve 15 and a conical sleeve part 16 connected to the two ends of the middle sleeve 15. The valve plate is mounted in the middle sleeve 15, and the axial extension direction of the valve body 1 is defined as the front-rear direction. The left and right radial side walls at the middle position of the front-rear direction of the valve body 1 are each provided with a mounting hole, and the axes of the two mounting holes are consistent. The outer side of the mounting hole is connected with the bearing seat 3. In this embodiment, the two bearing seats 3 are arranged on the radial sides in the left-right direction of the valve body 1 and are connected to the valve body 1 by screws. The bearing seat 3 is filled with a pressure ball bearing 5, and the bearing seat 3 is inserted with a support shaft 4. The inner end of the support shaft 4 extends into the valve body 1 after passing through the mounting hole inwardly. At this time, the axes of the support shafts 4 on the left and right sides are consistent. One of the support shafts 4 is assembled with the above-mentioned driving mechanism. In this embodiment, the driving mechanism is not specifically limited, and in the art, a permanent magnet servo actuator and a straight-tooth speed reducer are generally used to form a transmission cooperation with the above-mentioned support shaft 4, so as to drive the support shaft 4 to rotate reciprocally.

[0035] The structure of the valve plate 2 is shown in the figure, which comprises a plate body 8, the plate body 8 is a flat plate structure, the overall contour of the plate body 8 is an elliptical structure, the long side of the elliptical plate body 8 extends along the axis of the valve plate 2, and in order to facilitate the installation of the valve plate 2, the left and right ends of the plate body 8 are provided with mounting grooves 12, the support shaft 4 is inserted and mounted with the mounting groove 12 and is fixedly connected through a clamping plate 14, the clamping plate 14 is fixed on the plate body 8 through screws, so that the plate body 8 and the support shaft 4 are coaxially assembled, the plate body 8 can reciprocally rotate around the axis of the support shaft 4, and the mounting groove 12 constitutes a mounting portion connected with the support shaft 4. Since the overall contour of the plate body 8 is designed as an ellipse, and the long side size of the plate body 8 is consistent with the inner diameter of the base plate of the valve body 1, that is, the distance between the outer contour edge of the plate body 8 and the axis of the central flow hole 9 gradually decreases from the left and right ends to the middle position, and since the inner cavity of the valve body 1 is circular in cross section, when the valve plate 2 is in a position perpendicular to the axis of the valve body 1, a gap 13 is formed between the valve body 1 and the valve plate 2, and the gap 13 gradually increases from the left and right sides of the valve body 1 to the middle direction.

[0036] The position of the above-mentioned valve plate 2 is different, which brings the change of the resistance of the front side of the valve, for example, when the position of the valve plate 12 has a small rotation angle, it has a large resistance to the coal powder on the front side of the valve, which reduces the amount of wind and powder that can enter the pipeline, resulting in a decrease in the amount of wind and powder on the back side of the valve, so that the amount of wind and coal powder in the same pipe diameter is reduced, which leads to a decrease in the mass, concentration and speed of the wind and coal powder, thereby achieving the reduction of the mass, flow, concentration and speed of the wind and coal powder, and achieving the adjustment effect.

[0037] In the working of the valve body 1, when the flow regulating valve is in the closed position, part of the pulverized coal can be transported from the interval 13 between the valve body 1 and the valve plate 2 to the rear side. At the same time, due to the consistent orientation of the interval 13 and the angularly inclined direction of the valve plate 2, the interval 13 is designed in the form of a narrow inside and a wide outside, and when the pulverized coal passes through the plate body 8, it is reflected by the plate body 8 and finally adheres to the plate body 8, and is transported along the inclined surface of the plate body 8, thereby outputting the pulverized coal from the interval 13 to the rear side, which can ensure the overall minimum flow of the pulverized coal pipeline, and the interval 13 gradually increases to the middle position as the position of the interval 13 changes, and the interval 13 is larger than the existing circular plate body 8, and the pulverized coal has better passing performance, and the larger interval 13 can ensure that the pulverized coal within the profile diameter range of the interval 13 can be smoothly transported to the rear side in the front-rear direction, and due to the high flow rate and large amount of pulverized coal, the pulverized coal collides with another part of the pulverized coal transported into the interval 13 from the inclined surface of the plate body 8 before entering the interval 13, thereby canceling the momentum of another part of the pulverized coal in the inclined direction and reducing the impact speed in the inclined direction, and finally combining into a horizontal direction to the rear side of the valve body 1, greatly reducing the impact of the pulverized coal on the side wall of the valve body 1 located at the rear side of the valve plate 2 when passing through the interval 13, thereby effectively reducing the wear of the side wall of the valve body 1.

[0038] At the same time, in the present embodiment, a front-rear through central flow hole 9 is arranged at the center position of the valve plate 2, the diameter of the central flow hole 9 is about one-third of the length of the short side of the valve plate 2, and part of the pulverized coal can pass through the central flow hole 9 from the front side to the rear side of the valve plate 2. The arrangement of the central flow hole 9 and the interval 13 described above can together ensure that the minimum flow of the pulverized coal passing through meets the production requirements, and compared with the existing fully closed central blocking plate, the amount of pulverized coal that needs to be adjusted is greatly reduced, and only part of the pulverized coal needs to be controlled and adjusted in flow and speed (i.e. the part of the pulverized coal is transported obliquely from the surface of the valve plate 2), and the remaining part is transported to the rear side from the central flow hole 9 and the interval 13, which can ensure that the adjusted amount of pulverized coal meets the production requirement of not less than 60% of the original conveying amount, and the adjustment opening angle of the valve plate 2 is smaller than the original opening angle, and the adjustment precision is higher.

[0039] Of course, further, in order to ensure that the pulverized coal does not generate vortex flow on the side wall of the central flow hole 9 due to the accumulation of pulverized coal and the influence of pressure difference when the pulverized coal accumulates on the front side of the valve plate 2, the central flow hole 9 is a special-shaped hole with a circular center and a circular array of tooth grooves on the side wall, and when the pulverized coal passes through the central flow hole 9, the arrangement of the tooth grooves can increase the surface area of the pulverized coal, and the inner convex platform between the tooth grooves can collide with the pulverized coal to scatter the accumulated pulverized coal, so that the pulverized coal can pass through the central flow hole 9 more smoothly.

[0040] In addition, the plate body 8 is arranged with a comb long hole 10 on both sides of the turning axis, and the extension direction of the comb long hole 10 is perpendicular to the turning axis of the valve plate 2. Unlike the prior art, the two ends of the comb long hole 10 are closed. This is because when the coal powder is transported from the comb tooth structure, the coal powder transported to the rear side will be inclined to the inner side wall of the valve body 1. At this time, the coal powder has a large impulse, which will strongly wash the side wall of the valve body 1 on the rear side of the valve plate 2. After long-term use, the side wall of the valve body 1 will be worn and form a comb-shaped groove. In severe cases, the side wall of the valve body 1 will be broken, and the valve body 1 will be scrapped.

[0041] The structure of the comb long hole 10 is adopted. When the same part of the coal powder is transported to the rear side through the comb long hole 10, the direction of the coal powder is basically perpendicular to the end wall of the inclined far end of the comb long hole 10. Therefore, after entering the comb long hole 10, most of the coal powder will directly impact the far end wall of the comb long hole 10, and then be impacted by the coal powder transported from the front and rear directions to change direction. The impulse in the inclined direction is offset in the comb long hole 10 and on the rear side, further reducing the impact and wear of the coal powder on the side wall of the valve body 1.

[0042] That is, through the arrangement of the spacing 13, the center flow hole 9, and the comb long hole 10, the minimum passing value of the basic coal powder can be ensured to meet the subsequent production requirements under the premise that the opening adjustment of the valve plate 2 is small. Through the structure of the spacing 13 and the center flow hole 9 and the closed end design of the comb long hole 10, the impulse of most of the coal powder transported from the inclined side of the valve plate 2 can be reduced, and the flow rate in the inclined direction can be reduced. The structures work together to minimize the erosion and wear of the coal powder on the side wall of the valve body 1.

[0043] Preferably, the plate body 8 is arranged with a guide plate 11 on both sides of the center flow hole 9, and the extension direction of the guide plate 11 is parallel to the comb long hole 10. The guide plate 11 can further guide the coal powder to be transported along the inclined direction of the valve plate 2 and adhere to the inclined surface of the coal powder, effectively guiding the coal powder.

[0044] Preferably, in order to realize the installation of the guide plate 11 and facilitate the machining of the valve plate 2, the guide plate 11 is a strip-shaped plate structure that can be detachably connected to the valve plate 2 by screws.

[0045] Of course, in the embodiment, the comb tooth long hole 10 is machined on the plate body 8 in one piece, and in other embodiments, the structure of the comb tooth long hole 10 can also be a comb tooth groove consistent with the prior art, and then the groove end of the comb tooth groove is blocked with a block to form a structure similar to the comb tooth long hole 10, and after a period of use, the block can be replaced to reduce the wear of this part.

[0046] In other embodiments, the guide plate 11 can be realized in an integral structure with the plate body 8.

[0047] In other embodiments, the center flow hole 9 can adopt other special-shaped holes, or circular holes or polygonal holes and other structural forms.

[0048] In other embodiments, the overall structure of the valve plate 2 can adopt other structures with narrow middle distance and long distance on both ends to realize the size change of the spacing 13, such as connecting with a profile line with gradually increasing curvature, or using a similar diamond plate structure instead.

[0049] The embodiments of the valve plate involved in the present application are consistent with the structure of the valve plate in the above-mentioned embodiments of the flow regulating valve, and are not described in detail.

[0050] Finally, it should be pointed out that: the above embodiments are only for illustration and not for limiting the technical solutions of the present application, any equivalent replacement and modification or partial replacement of the present application without departing from the spirit and scope of the present application should be covered within the scope of protection of the claims of the present application.

Claims

1. A pulverized coal flow regulating valve for an air-powdered coal pipeline, comprising a valve body, wherein the axis of the valve body extends in the front-to-rear direction, the valve body being a cylindrical structure, bearing seats being mounted on the left and right radial sides of the valve body, the valve body being provided with a valve plate rotatably engaged with the bearing seat, the valve plate being reciprocated about a radial axis extending in the left and right directions of the valve body to adjust the opening of the valve body, the valve body being provided with a driving structure for driving the valve plate to reciprocate, and characterized in that: The valve plate includes a plate body, and a central flow hole that passes through the front and back is provided at the center position of the plate body. There is a gap between the outer wall of the valve plate and the valve body, and the gap gradually increases from the left and right sides of the valve body to the middle direction. Comb-tooth long holes are arranged on both sides of the flip axis of the valve plate, and the extension direction of the comb-tooth long holes is perpendicular to the flip axis of the valve plate.

2. The pulverized coal flow regulating valve for the air-pulverized coal pipeline according to claim 1, characterized in that: The valve plate is an elliptical plate, and an extension line of a long side of the ellipse of the valve plate is consistent with a turning axis of the valve plate.

3. The pulverized coal flow regulating valve for the air-pulverized coal pipeline according to claim 1 or 2, characterized in that: The central flow hole is a special-shaped hole with a circular center and a plurality of tooth grooves in a circular array on the side wall.

4. The pulverized coal flow regulating valve for an air-pulverized coal pipeline according to claim 1 or 2, characterized in that: Guide plates are arranged on both sides of the left and right sides of the central flow hole on the valve plate, and the extending direction of the guide plates is parallel to the comb tooth long hole.

5. The pulverized coal flow regulating valve for the air-pulverized coal pipeline according to claim 4, characterized in that: The guide plate is a strip plate structure detachably connected to the valve plate by screws.

6. The valve plate of the flow control valve is characterized in that: The valve plate includes a plate body, and connecting parts are arranged at the left and right ends of the plate body. The connecting parts are used to connect to the support shaft on the bearing seat so that the valve plate can flip back and forth around the axis of the support shaft. A central flow hole that passes through the front and back is arranged at the center position of the plate body. The distance between the outer contour edge line of the valve plate and the axis position of the central flow hole gradually decreases from the left and right ends to the middle position. Comb teeth long holes are arranged on both sides of the flip axis on the valve plate, and the extension direction of the comb teeth long holes is perpendicular to the flip axis of the valve plate.

7. The valve plate of the flow control valve according to claim 6, characterized in that: The valve plate is an elliptical plate, and an extension line of a long side of the ellipse of the valve plate is consistent with a turning axis of the valve plate.

8. The valve plate of the flow control valve according to claim 6 or 7, characterized in that: The central flow hole is a special-shaped hole with a circular center and a plurality of tooth grooves in a circular array on the side wall.

9. The valve plate of the flow control valve according to claim 6 or 7, characterized in that: Guide plates are arranged on both sides of the flow hole on the valve plate, and the extending direction of the guide plates is parallel to the comb tooth long hole.

10. The valve plate of the flow control valve according to claim 9, characterized in that: The guide plate is a strip plate structure detachably connected to the valve plate by screws.

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