Pulverized coal distributor with equal-resistance uniformly-distributed adjustable shrinkage cavities and using method of pulverized coal distributor

Abstract

The invention discloses a pulverized coal distributor with equal-resistance uniformly-distributed adjustable shrinkage cavities and a using method of the pulverized coal distributor. The pulverized coal distributor comprises the equal-resistance uniformly-distributed adjustable shrinkage cavities, a transition section, a flow guide plate, a dense-thin separation header, a pulverized coal amount adjusting section, an air amount adjusting section, a pulverized coal feeding pipeline, an outlet square-round joint and an outlet pulverized coal pipe. The equal-resistance evenly-distributed adjustable shrinkage cavity comprises a shell, a fixed base plate, an adjustable base plate, an adjusting lead screw, an adjusting hand wheel and a supporting sliding block. An outlet of the coal mill is communicated with the air volume adjusting section through the pulverized coal feeding pipeline, the equal-resistance evenly-distributed adjustable shrinkage cavities, the transition section, the flow guide plate, the thick-thin separation collecting box and the pulverized coal volume adjusting section, and an outlet square-round joint is connected with the equal-resistance evenly-distributed adjustable shrinkage cavities of the downstream branch pulverized coal pipeline. The distributor can effectively solve the problem that due to various reasons, a pulverized coal distributor cannot finally adjust air and pulverized coal distribution deviation to a specified range.

Description

Technical Field

[0001] The invention belongs to the technical field of coal-fired thermal power plant equipment, and in particular relates to a pulverized coal distributor with equal-resistance evenly distributed adjustable shrinkage holes and a use method thereof. Background Art

[0002] The application of direct-blowing pulverizing systems in modern large-capacity coal-fired boilers is quite common. Whether the primary air and powder distribution of each powder tube in the direct-blowing pulverizing system is uniform is one of the important factors that determine the safe, economical and stable operation of the boiler. If the primary wind speed deviation of each layer is large, it will cause a series of problems such as flame deviation in the furnace, uneven heat load in the furnace, overheating of the heating surface, and coking of the water-cooled wall. Generally, a wind speed leveling test is required during the commissioning of a new unit. However, when running in a hot state with powder, the resistance characteristics of each powder tube will change, and it is difficult for each powder tube to achieve resistance balance.

[0003] If the air and powder distribution of each powder pipe is uneven, it will directly affect the ignition and stable combustion of the coal powder airflow at the burner outlet, causing flame deviation, scouring of the furnace wall, furnace heat load and steam temperature deviation, NO X Increased emissions will also cause coal powder to deposit in horizontal pipes, leading to pipe blockage, causing corresponding burners to burn out, and even causing strong local reducing atmospheres, resulting in local high-temperature corrosion or coking of the heating surface, pipe bursts, and other problems, seriously affecting the safety and economy of the unit operation. As the units bear increasingly heavy peak-shaving tasks and increasingly stringent environmental protection requirements, the uniformity of air-powder distribution is particularly important. According to relevant standards, for medium-speed mill direct-blowing pulverizing systems, coal powder and air should be evenly distributed between the primary air ducts of the same-layer burners, with an air volume deviation of no more than ±5% and a coal powder distribution deviation of no more than ±10%.

[0004] However, the existing various air volume and coal powder distribution devices cannot meet this requirement. The main reason is that in some cases, the air and coal powder distribution deviations entering the coal mill outlet into each coal powder delivery pipeline are too large, exceeding the adjustment range of the coal powder distributor, especially when the coal powder distribution deviation is greater than ±60%, it is basically difficult to control the coal powder deviation within ±10% by adjusting the coal powder distributor. Summary of the invention

[0005] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art and to provide a pulverized coal distributor with evenly distributed adjustable shrinkage holes of equal resistance and a method of using the same. The distributor can effectively solve the problem that the pulverized coal distributor cannot ultimately adjust the air and powder distribution deviation to the specified range due to excessive initial distribution deviation.

[0006] In order to achieve the above object, the present invention adopts the following technical solution: The present invention provides a pulverized coal distributor with equal-resistance uniformly distributed adjustable shrinkage holes, comprising equal-resistance uniformly distributed adjustable shrinkage holes, a transition section, a guide plate, a thick-thin separation header, a pulverized coal quantity regulating section, an air quantity regulating section, a pulverized coal delivery pipeline, an outlet square section and an outlet pulverized coal pipe; The outlet of the coal mill is connected to the inlet of the air volume adjustment section via the powder delivery pipeline, the equal-resistance evenly distributed adjustable shrinkage holes, the transition section, the guide plate, the thick-thin separation header and the coal powder amount adjustment section in sequence; the outlet of the air volume adjustment section is connected to the inlet of the outlet powder pipe through the outlet square section and the equal-resistance evenly distributed adjustable shrinkage holes.

[0007] A further improvement of the present invention is that the equal resistance uniformly distributed adjustable shrinkage hole comprises a housing, a fixed base plate, an adjustable base plate, an adjusting screw, an adjusting hand wheel and a supporting slider; Two adjusting screws are arranged in parallel at the left and right ends in the shell, and the two ends of the adjusting screws extend out of the shell respectively. The fixed base plate is fixedly arranged in the shell, and a plurality of supporting sliders are arranged circumferentially of the adjustable base plate. The adjustable base plate is arranged in the shell and meshes with the two adjusting screws through the supporting sliders. At least one of the extending ends of the adjusting screw is provided with an adjusting handwheel, and a plurality of flow-through components are evenly arranged on the fixed base plate and the adjustable base plate body.

[0008] A further improvement of the present invention is that the adjustable substrate of the adjustable shrinkage holes with equal resistance and uniform distribution can adjust the flow area by adjusting the lead screw and the hand wheel.

[0009] A further improvement of the present invention is that an anti-wear ceramic layer is provided on the outer wall of the equal-resistance uniformly distributed adjustable shrinkage holes.

[0010] A further improvement of the present invention is that the flow-through component of the equal-resistance uniformly distributed adjustable shrinkage holes is in the shape of a circle or a symmetrical arc.

[0011] A further improvement of the present invention is that the thick-thin separation header is a shutter structure.

[0012] A further improvement of the present invention is that a plurality of coal powder regulating mechanisms are provided in the coal powder amount regulating section.

[0013] A further improvement of the present invention is that an air volume regulating mechanism is provided in each channel in the air volume regulating section.

[0014] A further improvement of the present invention is that the number of the outlet powder pipes is the same as the number of the coal powder regulating mechanisms and the number of the air volume regulating mechanisms.

[0015] The present invention also provides a method for using a pulverized coal distributor with equal-resistance uniformly distributed adjustable shrinkage holes, characterized in that the method is based on the pulverized coal distributor with equal-resistance uniformly distributed adjustable shrinkage holes, and comprises: After being output through the outlet of the coal mill, the air-powder airflow enters the powder delivery pipeline to form the initial air-powder distribution. The air-powder airflow enters the equal-resistance uniformly distributed adjustable shrinkage hole through the powder delivery pipeline. After adjustment, the resistance of the air-powder airflow changes. Under the action of the equal-resistance uniformly distributed plate, the air-powder airflow is evenly mixed. The air-powder airflow is guided to the transition section and further mixed in the transition section to reduce the air-powder distribution deviation before entering the coal powder amount adjustment section; then the air-powder airflow enters the thick-thin separation header and the coal powder amount adjustment section. After the air-powder airflow enters the coal powder amount adjustment section, the cross-sectional area corresponding to each channel is changed by adjusting each coal powder amount adjustment mechanism, thereby achieving the purpose of changing the amount of coal powder in each channel entering the air volume adjustment section, and then by coordinating and adjusting each air volume adjustment structure set in the air volume adjustment section to change the resistance of each channel, thereby achieving the purpose of changing the air volume in each channel entering the air volume adjustment section, and finally achieving the purpose of adjusting both the coal powder amount and the air volume; finally, the air-powder airflow enters the outlet powder pipe through the outlet square and round section and the equal-resistance uniformly distributed adjustable shrinkage hole.

[0016] Compared with the prior art, the present invention has at least the following beneficial technical effects: The present invention provides a coal powder distributor with adjustable shrinkage holes with equal resistance and uniform distribution and a method of using the same. After the air-powder airflow is output through the outlet of the coal mill, it enters the powder delivery pipeline to form an initial air-powder distribution. The air-powder airflow enters the adjustable shrinkage holes with equal resistance and uniform distribution through the powder delivery pipeline. If the air-powder distribution deviation is large, the adjustable base plates of the adjustable shrinkage holes with equal resistance and uniform distribution of the main pipe and the branch pipe are adjusted, and the resistance of the air-powder airflow changes. Under the action of the equal resistance and uniform distribution plates, the air-powder airflow is evenly mixed. The air-powder airflow is guided to the transition section and further mixed in the transition section to reduce the air-powder distribution deviation before entering the coal powder amount adjustment section, effectively solving the problem that the coal powder distributor cannot ultimately adjust the air and powder distribution deviation to the specified range due to excessive initial distribution deviation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the present invention.

[0018] Figure 2 It is a top view of the adjustable shrinkage holes with equal resistance and uniform distribution.

[0019] Figure 3 It is a side view of the adjustable shrinkage holes with equal resistance and uniform distribution.

[0020] Description of reference numerals: 1. Adjustable shrinkage holes with equal resistance and uniform distribution, 2. Transition section, 3. Guide plate, 4. Thick and thin separation header, 5. Powder quantity adjustment section, 6. Air volume adjustment section, 7. Powder delivery pipeline, 8. Outlet square section, 9. Outlet powder pipe, 11. Shell, 12. Fixed base plate, 13. Adjustable base plate, 14. Adjustment screw, 15. Adjustment hand wheel, 16. Support slider, 17. Flow-through components. DETAILED DESCRIPTION

[0021] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0022] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0023] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0024] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0026] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0027] It should be further understood that the term "and / or" used in the present description and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0028] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0029] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0030] Example 1 refer to Figures 1 to 3 The present embodiment provides a pulverized coal distributor with equal-resistance uniformly distributed adjustable shrinkage holes, comprising equal-resistance uniformly distributed adjustable shrinkage holes 1, a transition section 2, a guide plate 3, a thick-thin separation header 4, a powder quantity adjustment section 5, an air volume adjustment section 6, a powder delivery pipeline 7, an outlet square section 8 and an outlet powder pipe 9.

[0031] The equal-resistance uniformly distributed adjustable shrinkage hole 1 comprises a shell 11, a fixed base plate 12, an adjustable base plate 13, an adjusting screw 14, an adjusting hand wheel 15, a supporting slider 16, and a flow-through component 17; the outlet of the coal mill is connected with the air volume adjustment section 6 through the powder delivery pipeline 7, the equal-resistance uniformly distributed adjustable shrinkage hole 1, the transition section 2, the guide plate 3, the thick-thin separation header 4 and the coal powder amount adjustment section 5, and the outlet of the air volume adjustment section 6 is connected with the inlet of the outlet powder pipe 9 through the outlet square section 8 and the equal-resistance uniformly distributed adjustable shrinkage hole 1.

[0032] In this embodiment, the air-powder gas flows through the outlet of the coal mill and then enters the powder delivery pipe 7 to form the initial air-powder distribution. The air-powder gas flows through the powder delivery pipe 7 and enters the equal-resistance uniformly distributed adjustable shrinkage hole 1. If the air-powder distribution deviation is large, the adjustable substrate 13 of the equal-resistance uniformly distributed adjustable shrinkage hole of the main pipe and the branch pipe is adjusted, and the air-powder gas flow resistance changes. Under the action of the equal-resistance uniform plate, the air-powder gas flow is evenly mixed. The air-powder gas flow is guided to the transition section 2 and further mixed in the transition section 2 to reduce the air-powder distribution deviation before entering the coal powder amount adjustment section, and then improve the initial conditions of the distribution deviation. Since the equal-resistance uniformly distributed adjustable shrinkage hole 1 is directly eroded by the air-powder gas flow, the present invention provides an anti-wear ceramic layer on the outer wall of the equal-resistance uniformly distributed adjustable shrinkage hole 1. The anti-wear ceramic layer is usually made of high-hardness materials, such as aluminum oxide Al2O3, silicon carbide SiC, etc. These materials have extremely high hardness and can effectively resist the erosion and wear of the air-powder gas flow. The wear-resistant ceramic layer has excellent wear resistance and can withstand the impact of high-speed airflow for a long time without being easily worn, which significantly extends the service life of the equipment. Since the equal-resistance uniformly distributed adjustable shrinkage holes are usually used in high-temperature environments, such as the powder delivery pipeline of a coal-fired boiler, the wear-resistant ceramic layer needs to have good high-temperature resistance to ensure that it can still maintain stability and wear resistance under high temperature conditions.

[0033] In this embodiment, the flow-through component of the equal-resistance uniformly distributed adjustable shrinkage hole 1 is circular or symmetrically arc-shaped. The thick-thin separation header 4 is a shutter structure. The shutter structure can effectively divide the coal powder airflow into multiple streams through its unique blade arrangement, and form vortices and disturbances between these airflows. Such vortices and disturbances help to redistribute the coal powder particles, so that the coal powder particles with larger particle size or higher concentration (i.e., the "thick" side) and the coal powder particles with smaller particle size or lower concentration (i.e., the "light" side) can be separated. A number of coal powder regulating mechanisms are arranged in the coal powder amount regulating section 5. The main task of the coal powder regulating mechanism is to accurately adjust the coal powder flow entering the combustion area. By adjusting the parameters such as the opening or rotation speed of these mechanisms, the coal powder flow can be finely controlled to ensure that the coal powder supply during the combustion process is stable and meets the demand. The stability of the coal powder flow directly affects the combustion efficiency and combustion stability. Too large a flow may lead to incomplete combustion, ash accumulation and slagging; too small a flow may not meet the load requirements of the boiler, affecting the power generation efficiency.

[0034] Each channel in the air volume regulating section 6 is provided with an air volume regulating mechanism. There are many types of air volume regulating mechanisms, and the common ones include: adjusting the damper, changing the air volume passing through the channel by adjusting the opening of the damper. This mechanism has a simple structure and is easy to operate, and is a commonly used method for air volume regulation. The baffle regulator sets a movable baffle in the channel, and changes the air volume by adjusting the position and angle of the baffle. This mechanism has high adjustment accuracy and stability. The variable frequency fan changes the air supply volume by adjusting the speed of the fan. The variable frequency fan has the advantages of a wide adjustment range and a fast response speed, and is widely used in occasions where frequent air volume adjustment is required.

[0035] After the air-powder airflow enters the coal powder amount regulating section 5, the cross-sectional area corresponding to each channel is changed by adjusting each coal powder amount regulating mechanism, thereby achieving the purpose of changing the amount of coal powder in each channel entering the air volume regulating section 6, and then by coordinating and adjusting each air volume regulating structure set in the air volume regulating section 6 to change the resistance of each channel, thereby achieving the purpose of changing the air volume in each channel entering the air volume regulating section 6, and finally achieving the adjustment of both the coal powder amount and the air volume.

[0036] In this embodiment, the equal resistance uniformly distributed adjustable shrinkage hole 1 includes a housing 11, a fixed base plate 12, an adjustable base plate 13, an adjusting screw 14, an adjusting hand wheel 15 and a supporting slider 16; two adjusting screws 14 are arranged in parallel at the left and right ends of the housing 11, and the two ends of the adjusting screw 14 extend out of the housing 11 respectively, the fixed base plate 12 is fixedly arranged in the housing 11, and a plurality of supporting sliders 16 are arranged on the circumference of the adjustable base plate 13, the adjustable base plate 13 is arranged in the housing 11 and meshes with the two adjusting screws 14 through the supporting sliders 16, and at least one of the extending ends of the adjusting screw 14 is provided with an adjusting hand wheel 15, and a plurality of flow-through components 17 are evenly arranged on the fixed base plate 12 and the adjustable base plate 13 body. The parallel arrangement of the two adjusting screws 14 in the housing 11 realizes the precise control of the position of the adjustable base plate 13. This double screw design increases the stability and accuracy of the adjustment. The setting of the adjusting hand wheel 15 enables the operator to conveniently manually adjust the opening of the shrinkage hole without using special tools, thereby improving the convenience of operation. The meshing design of the support slider 16 and the adjusting screw 14 ensures stability and no jamming during the adjustment process, further improving the adjustment accuracy.

[0037] Example 2 refer to Figures 1 to 3 The present embodiment provides a method for using a pulverized coal distributor with equal-resistance uniformly distributed adjustable shrinkage holes, comprising: After being output through the outlet of the coal mill, the air-powder airflow enters the powder delivery pipe 7 to form the initial air-powder distribution. The air-powder airflow enters the equal-resistance uniformly distributed adjustable shrinkage hole 1 through the powder delivery pipe 7. After adjustment, the resistance of the air-powder airflow changes. Under the action of the equal-resistance uniformly distributed plate, the air-powder airflow is evenly mixed. The air-powder airflow is guided to the transition section 2 and further mixed in the transition section 2 to reduce the air-powder distribution deviation before entering the coal powder amount adjustment section; then the air-powder airflow enters the thick-thin separation header 4 and the coal powder amount adjustment section 5. After the air-powder airflow enters the coal powder amount adjustment section 5, the cross-sectional area corresponding to each channel is changed by adjusting each coal powder amount adjustment mechanism, thereby achieving the purpose of changing the amount of coal powder in each channel entering the air volume adjustment section 6. Then, by coordinating and adjusting each air volume adjustment structure set in the air volume adjustment section 6, the resistance of each channel is changed, thereby achieving the purpose of changing the air volume in each channel entering the air volume adjustment section 6, and finally achieving the purpose of adjusting both the coal powder amount and the air volume; finally, the air-powder airflow enters the outlet powder pipe 9 through the outlet square section 8 and the equal-resistance uniformly distributed adjustable shrinkage hole 1.

[0038] In the embodiment, the specific working process of the equal-resistance evenly distributed adjustable shrinkage hole 1 is as follows: the engineering and technical personnel determine the upstream or downstream equal-resistance evenly distributed adjustable shrinkage hole 1 that needs to be adjusted based on the actual on-site test data; after determination, the adjusting screw 14 of the equal-resistance evenly distributed adjustable shrinkage hole 1 is then adjusted. According to the rotation direction of the adjusting screw, generally clockwise is used to reduce the flow area of ​​the equal-resistance evenly distributed adjustable shrinkage hole 1, specifically, the screw is rotated clockwise, and the adjustable substrate 13 moves under the drive of the meshing support slider 16, and the circular or arc-shaped flow component 17 gradually becomes smaller with the movement of the adjustable substrate 13, and the uniformity and resistance characteristics of the airflow change to achieve the ideal airflow distribution characteristics; it should be noted that the adjusting screws 14 at the left and right ends need to be adjusted at the same speed at the same time to prevent the support slider 16 from moving inconsistently, resulting in problems such as the adjustable substrate 13 changing direction and getting stuck; during the adjustment process, the fixed substrate 12 remains fixed.

[0039] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0040] In addition, it should be understood that although this specification is described in accordance with the implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art. The above content is only to illustrate the technical idea of ​​the present invention, and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution according to the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A pulverized coal distributor with equal resistance and evenly distributed adjustable shrinkage holes, characterized in that: It comprises an adjustable shrinkage hole with equal resistance and uniform distribution (1), a transition section (2), a guide plate (3), a thick-thin separation header (4), a powder quantity adjustment section (5), an air quantity adjustment section (6), a powder delivery pipeline (7), an outlet square section (8) and an outlet powder pipe (9); The outlet of the coal mill is connected to the inlet of the air volume regulating section (6) via the powder delivery pipeline (7), the equal resistance evenly distributed adjustable shrinkage hole (1), the transition section (2), the guide plate (3), the thick-thin separation header (4) and the coal powder amount regulating section (5) in sequence, and the outlet of the air volume regulating section (6) is connected to the inlet of the outlet powder pipe (9) via the outlet square section (8) and the equal resistance evenly distributed adjustable shrinkage hole (1).

2. A pulverized coal distributor with equal resistance and evenly distributed adjustable shrinkage holes according to claim 1, characterized in that: The equal-resistance uniformly distributed adjustable shrinkage hole (1) comprises a housing (11), a fixed base plate (12), an adjustable base plate (13), an adjusting screw (14), an adjusting hand wheel (15) and a supporting slide block (16); Two adjusting screws (14) are arranged in parallel at left and right ends in the housing (11), and both ends of the adjusting screws (14) extend out of the housing (11), the fixed base plate (12) is fixedly arranged in the housing (11), a plurality of supporting sliders (16) are arranged in the circumferential direction of the adjustable base plate (13), the adjustable base plate (13) is arranged in the housing (11) and meshes with the two adjusting screws (14) through the supporting sliders (16), at least one of the extending ends of the adjusting screws (14) is provided with an adjusting hand wheel (15), and a plurality of flow-through components (17) are evenly arranged on the fixed base plate (12) and the adjustable base plate (13).

3. The pulverized coal distributor with equal resistance uniformly distributed adjustable shrinkage holes according to claim 2 is characterized in that: The adjustable base plate (13) of the equal-resistance uniformly distributed adjustable shrinkage holes (1) is used to adjust the flow area by adjusting the lead screw (14) and the adjusting hand wheel (15).

4. The pulverized coal distributor with equal-resistance uniformly distributed adjustable shrinkage holes according to claim 2 is characterized in that: An anti-wear ceramic layer is provided on the outer wall of the equal-resistance uniformly distributed adjustable shrinkage hole (1).

5. The pulverized coal distributor with equal resistance uniformly distributed adjustable shrinkage holes according to claim 2, characterized in that: The flow-through component of the equal-resistance uniformly distributed adjustable shrinkage hole (1) is in the shape of a circle or a symmetrical arc.

6. The pulverized coal distributor with equal resistance uniformly distributed adjustable shrinkage holes according to claim 1, characterized in that: The thick and thin separation header (4) is a shutter structure.

7. The pulverized coal distributor with equal resistance uniformly distributed adjustable shrinkage holes according to claim 1, characterized in that: A plurality of coal powder regulating mechanisms are arranged in the coal powder amount regulating section (5).

8. The pulverized coal distributor with equal resistance uniformly distributed adjustable shrinkage holes according to claim 7, characterized in that: Each channel in the air volume adjustment section (6) is provided with an air volume adjustment mechanism.

9. The pulverized coal distributor with equal resistance and evenly distributed adjustable shrinkage holes according to claim 8, characterized in that: The number of the outlet powder pipes (9) is the same as the number of the coal powder regulating mechanisms and the number of the air volume regulating mechanisms.

10. A method for using a pulverized coal distributor with equal resistance, uniformly distributed and adjustable shrinkage holes, characterized in that: The method is based on a pulverized coal distributor with equal-resistance uniformly distributed adjustable shrinkage holes according to any one of claims 1 to 9, comprising: The air-powder airflow is output through the outlet of the coal mill and enters the powder delivery pipe (7) to form an initial air-powder distribution. The air-powder airflow passes through the powder delivery pipe (7) and enters the equal resistance uniformly distributed adjustable shrinkage hole (1). After adjustment, the air-powder airflow resistance changes. Under the action of the equal resistance uniform plate, the air-powder airflow is evenly mixed. The air-powder airflow is guided to the transition section (2) and further mixed in the transition section (2) to reduce the air-powder distribution deviation before entering the coal powder quantity adjustment section. Then, the air-powder airflow enters the thick-thin separation header (4) and the coal powder quantity adjustment section (5) and enters the coal powder quantity adjustment section. After the powder quantity regulating section (5), the cross-sectional area corresponding to each channel is changed by adjusting each coal powder quantity regulating mechanism, thereby achieving the purpose of changing the amount of coal powder entering each channel in the air quantity regulating section (6), and then by coordinating and adjusting each air quantity regulating structure provided in the air quantity regulating section (6) to change the resistance of each channel, thereby achieving the purpose of changing the air volume entering each channel in the air quantity regulating section (6), and finally achieving the adjustment of both the coal powder quantity and the air volume; finally, the air-powder airflow passes through the outlet square section (8) and the equal resistance uniformly distributed adjustable shrinkage hole (1) and enters the outlet powder pipe (9).

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