Pulverized coal flow adjusting device and coal mill
By using a turbulent air ring and gas supply mechanism in the coal mill, combined with an automatic regulating valve and control system, the problem of uneven coal flow at the coal mill outlet was solved, boiler efficiency and safety were improved, and coal consumption and equipment wear were reduced.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-02
- Publication Date
- 2026-03-24
AI Technical Summary
In existing coal mills, the amount of pulverized coal carried by different air ducts of the same coal mill varies greatly, which affects boiler efficiency and operational safety. The existing damper adjustment method is not precise enough and is easily affected by equipment and human factors.
By employing a turbulent air ring and an air supply mechanism, the coal powder concentration is adjusted through reverse airflow. Combined with an automatic regulating valve and control mechanism, online automatic control is achieved to ensure the uniformity of coal powder concentration in the coal powder conveying pipeline.
It improves boiler combustion efficiency and operational safety, reduces coal consumption, lowers equipment wear, and enables rapid adjustment and uniformity of pulverized coal concentration in pulverized coal conveying pipelines.
Smart Images
Figure CN224025242U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a kind of coal powder flow regulating device and coal mill, belong to coal-fired power plant coal mill technical field. BACKGROUND
[0002] Coal mill is an important component in the coal pulverizing system of large coal-fired power plants, and it undertakes the important links of grinding, drying and transporting raw coal. Its efficient and stable operation is directly related to the safety and overall performance of the coal-fired power plant. After the raw coal is pulverized by the coal mill, it is usually carried by the primary air through the multi-leg powder pipe and sent into the boiler for combustion. Under ideal operating conditions, the amount of coal powder carried and delivered by each air pipe is consistent. However, due to the harsh operating conditions inside the coal mill, the deviation of the amount of coal powder carried and delivered by different air pipes of the same coal mill is very large during actual operation, and in some cases, the deviation exceeds 50%, which seriously affects the efficiency and safety of the boiler.
[0003] The current medium-speed coal mill in power plants uses air door baffles to regulate the air volume at the outlet, which indirectly controls the distribution of the powder volume in the air pipe. This adjustment method is easily affected by equipment conditions, operating conditions, and human subjective factors, and cannot achieve the desired effect. For example, components such as air door baffles can easily malfunction in harsh working environments, leading to inaccurate air volume regulation and affecting powder volume distribution. The skill level of the operator can also affect the concentration and quality of the dust pipe at the outlet of the coal mill. Deviation in the concentration of the coal mill powder pipe can have various adverse effects on power plant production, including increased coal consumption, decreased coal powder quality, and increased equipment wear and tear. SUMMARY
[0004] The main purpose of the utility model is to provide a coal powder flow regulating device and coal mill that can solve the problem of uneven powder flow at the outlet of the coal mill, improve the efficiency and safety of the boiler, and overcome the shortcomings of the prior art.
[0005] To achieve the above-mentioned utility model purposes, the utility model adopts the following technical solutions:
[0006] The first aspect of the utility model embodiment provides a coal powder flow regulating device, which includes a gas supply mechanism and y turbulent flow air rings. The interior of the turbulent flow air ring is a hollow chamber, and one or more air outlets are provided on the turbulent flow air ring. The gas supply mechanism is in communication with the chamber inside the y turbulent flow air rings, and the turbulent flow gas provided by the gas supply mechanism can be output through the air outlet on the turbulent flow air ring and form a gas jet, where y ≥ 2.
[0007] The second aspect of the embodiment of the utility model provides a coal mill, including coal mill main part and x pulverized coal delivery pipeline, x pulverized coal delivery pipeline is linked with the pulverized coal collection chamber of coal mill main part respectively, the pulverized coal that forms in the coal mill main part can be carried via the output airflow and enter x pulverized coal delivery pipeline via the pulverized coal collection chamber, and output or enter downstream equipment via x pulverized coal delivery pipeline;
[0008] And, the coal mill further includes the coal flow adjusting device, y jet flow wind rings are arranged in the pulverized coal collection chamber and / or x pulverized coal delivery pipelines, and the jet flow wind rings arranged in the pulverized coal collection chamber are arranged to be close to the upstream of the inlets of x pulverized coal delivery pipelines respectively, the air outlets on the jet flow wind rings are located on the upstream side of the jet flow wind rings facing the pulverized coal flow, the gas flow direction of the gas jet provided by the coal flow adjusting device is opposite to the flow direction of the pulverized coal, and x is greater than or equal to 2.
[0009] Compared with the prior art, the utility model has the advantages of:
[0010] The coal mill provided by the embodiment of the utility model adjusts the concentration of the pulverized coal in the pulverized coal delivery pipeline by increasing the air resistance, can increase the reverse air resistance in the pulverized coal delivery pipeline, reduce the concentration of the pulverized coal flow, add the jet flow wind in the jet flow wind pipe to dilute the concentration of the pulverized coal in the region to a certain extent, rapidly reduce the concentration of the primary air pulverized coal entering the pulverized coal delivery pipeline, and thus rapidly regulate the pulverized coal flow in the pulverized coal delivery pipeline.
[0011] The coal flow adjusting device of the coal mill provided by the embodiment of the utility model is based on the online measurement data of the concentration of the pulverized coal, uses an automatic adjusting valve, relies on a control mechanism to determine data, sets an adjusting error range, realizes online automatic control, adjusts in real time according to feedback, and has the advantages of short response time and high adjusting efficiency compared with a manual mechanical adjusting mode.
[0012] The air resistance ring of the coal mill provided by the embodiment of the utility model can provide weak jet flow wind pressure under normal working conditions, the spraying or the hole does not block, and has basically no influence on the concentration of the pulverized coal in the air pipe. ACCURACY OF DRAWINGS
[0013] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creating laborious work.
[0014] Figure 1 is a whole structure schematic diagram of a coal mill provided in a typical embodiment case of the present application;
[0015] Figure 2 is a structure schematic diagram of a pulverized coal flow adjusting device in a coal mill provided in a typical embodiment case of the present application. DETAILED DESCRIPTION
[0016] In view of the deficiencies in the prior art, the present inventors have long studied and practiced to propose the technical solution of the present application. The technical solution, its implementation process and principles will be further explained and described as follows.
[0017] A first aspect of the embodiment of the present application provides a pulverized coal flow adjusting device, which comprises: a gas supply mechanism and y vortex wind rings, the interior of the vortex wind ring is a hollow chamber, one or more air outlets are arranged on the vortex wind ring, the gas supply mechanism is in communication with the chamber in the interior of the vortex wind ring, the vortex airflow provided by the gas supply mechanism can be output via the air outlet on the vortex wind ring and form a gas jet, y≥2.
[0018] Further, the vortex wind ring and the chamber in the interior of the vortex wind ring are both annular structures, and the plurality of air outlets are spaced and uniformly distributed along the circumference of the vortex wind ring.
[0019] Further, the plurality of air outlets are arranged on the same end surface of the vortex wind ring.
[0020] Further, the vortex wind ring is an annular tubular structure.
[0021] Further, the overall profile of the vortex wind ring is a cylindrical or circular truncated cone structure.
[0022] Further, the gas supply mechanism is in communication with the vortex wind ring via a vortex wind pipe, and an adjusting valve is further arranged on the vortex wind pipe, and the adjusting valve is used at least for adjusting the flow of the vortex airflow input into the vortex wind ring.
[0023] In a more specific embodiment, the pulverized coal flow adjusting device further comprises one or more nozzles, the nozzles are fixedly arranged on the vortex wind ring, each nozzle corresponds to and communicates with an air outlet, and the directions of the plurality of nozzles are the same or different.
[0024] In a more specific embodiment, the pulverized coal flow adjusting device further comprises an annular wind resistance ring, the vortex wind ring is arranged on the wind resistance ring, the wind resistance ring is arranged at one end close to the air outlet along the axial direction of the vortex wind ring, and the air outlet on the vortex wind ring is located in the pipe cavity enclosed by the wind resistance ring.
[0025] Further, the wind resistance ring is a ring-shaped tubular structure, and the inner ring surface and the outer ring surface of the wind resistance ring correspond to the inner ring surface and the outer ring surface of the vortex wind ring respectively and are located in the same ring surface.
[0026] Further, the overall profile of the wind resistance ring is a cylindrical or circular truncated cone structure.
[0027] The second aspect of the embodiment of the utility model provides a coal mill, including coal mill main part and x pulverized coal delivery pipeline, x pulverized coal delivery pipeline is linked with the pulverized coal collection chamber of coal mill main part respectively, the pulverized coal that is formed in the coal mill main part can be carried via the output airflow and enter x pulverized coal delivery pipeline via the pulverized coal collection chamber, and is output or enters downstream equipment via x pulverized coal delivery pipeline;
[0028] And, the coal mill further includes the pulverized coal flow adjusting device, y vortex wind rings are arranged in the pulverized coal collection chamber and / or x pulverized coal delivery pipelines, and the vortex wind rings arranged in the pulverized coal collection chamber are arranged to be close to the upstream of the inlet of x pulverized coal delivery pipelines respectively, the air outlet on the vortex wind ring is located on the upstream side of the vortex wind ring towards the pulverized coal flow, the gas jet provided by the pulverized coal flow adjusting device is opposite to the flow direction of the pulverized coal, and x is greater than or equal to 2.
[0029] Further, the pulverized coal collection chamber is a conical structure, and the radial cross-sectional area of the pulverized coal collection chamber gradually increases along the direction towards the pulverized coal delivery pipeline.
[0030] In a more specific embodiment, the coal mill further includes a control mechanism and x pulverized coal concentration monitoring mechanisms, and the x pulverized coal concentration monitoring mechanisms are arranged in the x pulverized coal delivery pipelines respectively, in each of the pulverized coal delivery pipelines, the pulverized coal concentration monitoring mechanism is located on the downstream side of the vortex wind ring along the flow direction of the pulverized coal, the pulverized coal concentration monitoring mechanism is further connected with the control mechanism, and the control mechanism is further connected with the pulverized coal flow adjusting device.
[0031] The technical scheme, implementation process and principles will be further explained and described below in combination with the drawings and specific implementation cases, unless specifically stated, the air compressor, regulating valve, pulverized coal concentration monitoring sensor, controller and numerical control system thereof in the embodiment of the utility model are known in the art, and can be obtained by market purchase, and here, the specific structure and product model thereof are not limited and described.
[0032] In a more specific embodiment, please refer to Figure 1The coal mill comprises a coal mill body 5, one coal falling pipeline 1 and x pulverized coal conveying pipelines 2, the coal falling pipeline 1 and the x pulverized coal conveying pipelines 2 are communicated with the coal mill body 5 respectively, the coal falling pipeline 1 is used for guiding the coal blocks into the coal mill body 5, the coal mill body 5 is used for crushing and grinding the coal blocks into the pulverized coal, the pulverized coal formed by the grinding is carried into the x pulverized coal conveying pipelines 2 by the output airflow, and is output through the x pulverized coal conveying pipelines 2 or enters the downstream equipment. It should be noted that the structure of the coal mill body 5 is known to those skilled in the art, which is different according to the equipment model, and the crushing and grinding structure in the coal mill body 5 is not limited herein, and the output airflow carrying the pulverized coal into the x pulverized coal conveying pipelines 2 is also different according to the coal mill model, for example, the output airflow in the steel ball coal mill can be provided by the hot air introduced into the coal mill as a drying agent, or can be provided by the hot primary air introduced from the bottom of the medium-speed coal mill. Figure 1 The coal mill shown in the figure comprises two pulverized coal conveying pipelines 2, i.e. x=2, and it can be understood that the number of the pulverized coal conveying pipelines 2 can also be selected as other numbers.
[0033] Specifically, the coal mill body 5 can comprise a crushing and grinding chamber and a pulverized coal collecting chamber, the pulverized coal collecting chamber is arranged at the top of the crushing and grinding chamber and is directly communicated with the crushing and grinding chamber, the function structure for realizing the crushing and grinding of the coal blocks is arranged in the crushing and grinding chamber, the pulverized coal formed by the crushing and grinding of the crushing and grinding chamber will first enter the pulverized coal collecting chamber, the pulverized coal conveying pipeline 2 is directly communicated with the pulverized coal collecting chamber, i.e. the pulverized coal inlet of the pulverized coal collecting chamber is communicated with the crushing and grinding chamber, and the x pulverized coal outlets of the pulverized coal collecting chamber are one-to-one corresponding and communicated with the x pulverized coal conveying pipelines 2. More specifically, in order to improve the consistency of the amount of the pulverized coal entering the x pulverized coal conveying pipelines 2, the x pulverized coal outlets are distributed at equal intervals along the circumference of the pulverized coal collecting chamber, and preferably, the x pulverized coal outlets are distributed on the same circumference, and the horizontal distance between the center positions of the x pulverized coal outlets and the pulverized coal inlet in the radial section of the pulverized coal collecting chamber is the same.
[0034] More specifically, the area of the radial section of the pulverized coal collecting chamber gradually increases in the direction from the pulverized coal inlet to the pulverized coal outlet, i.e. the pulverized coal collecting chamber is a conical chamber, and the volume of the pulverized coal collecting chamber and the specific sizes of the pulverized coal inlet and the pulverized coal outlet are not limited herein, and it should be noted that the inner diameters, the shapes of the radial sections, the lengths and other size parameters of the x pulverized coal conveying pipelines 2 are the same, so as to ensure that the flow rates of the pulverized coal in the x pulverized coal conveying pipelines 2 are the same.
[0035] Specifically, in order to make the consistency of the amount of pulverized coal carried by the x pulverized coal conveying pipelines 2, the coal mill further comprises a pulverized coal flow adjusting device 4, which is in communication with the pulverized coal collecting chamber and / or the x pulverized coal conveying pipelines 2, and is used at least for introducing a turbulent air flow into the pulverized coal collecting chamber and / or the x pulverized coal conveying pipelines 2, the air flow direction of the turbulent air flow being opposite to the flow direction of the pulverized coal, and it is to be noted that the pressure of the turbulent air flow is less than the pressure of the output air flow, the turbulent air flow forms wind resistance to the pulverized coal carried by the output air flow, and by adjusting the flow of the turbulent air flow, the uniformity of the amount of pulverized coal in the x pulverized coal conveying pipelines 2 can be improved, thereby achieving the purpose of uniform flow of the pulverized coal.
[0036] More specifically, please refer to Figure 1 and Figure 2 , the pulverized coal flow adjusting device 4 comprises a gas supply mechanism, x turbulent air rings 8 (i.e. y=x), the x turbulent air rings 8 are in communication with the gas supply mechanism through x turbulent air pipes 11 respectively, the x turbulent air rings 8 are arranged in the pulverized coal collecting chamber, and the x turbulent air rings 8 correspond to the x pulverized coal outlets respectively, specifically, the x turbulent air rings 8 are arranged one by one on the upstream side of the x pulverized coal outlets (in the present application, the upstream and downstream are determined according to the flow direction of the output air flow / pulverized coal carried by the output air flow), and the compressed air provided by the gas supply mechanism is output from the x turbulent air rings 8 through the x turbulent air pipes 11 respectively and forms a turbulent air flow. Specifically, an independent adjusting valve 7 is arranged on each turbulent air pipe 11, and by adjusting the adjusting valve 7, the flow of the turbulent air flow output from the turbulent air ring 8 can be changed.
[0037] More specifically, please refer to Figure 1 and Figure 2, the jet flow ring 8 is annular tubular structure, the inside of the jet flow ring 8 is hollow structure, the end surface of the jet flow ring 8 opposite to the pulverized coal outlet (namely the whole direction of the pulverized coal inlet) is provided with a plurality of air outlets, the plurality of air outlets is preferably equidistantly distributed along the circumference of the jet flow ring 8, the shape and size of the plurality of air outlets are also preferably set to be the same, the angle between the axis of the plurality of air outlets and the axis of the jet flow ring 8 can be the same or different. The pulverized coal output from the pulverized coal outlet can pass through the surrounding and the middle lumen of the jet flow ring 8. As a preferred or alternative solution, the upper of the jet flow ring 8 can also be provided with a plurality of nozzles 10, the plurality of nozzles 10 is in communication with the jet flow ring 8, the compressed gas is sprayed out of the plurality of nozzles 10 and forms a jet flow, the arrangement structure of the plurality of nozzles 10 is the same as that of the plurality of air outlets, the plurality of nozzles 10 is preferably equidistantly distributed along the circumference of the jet flow ring 8, the structure and size of the plurality of nozzles 10 are also preferably set to be the same, the angle between the axis of the plurality of nozzles 10 and the axis of the jet flow ring 8 can be the same or different. Specifically, the annular tubular jet flow ring 8 can effectively buffer and uniformly distribute the compressed air flow entering the plurality of air outlets or the plurality of nozzles 10, the several air outlets or nozzles 10 can provide different angle reverse wind (namely the aforementioned jet flow), when the concentration of the pulverized coal flow is too high, the wind resistance can be provided to reduce the concentration of the pulverized coal. Exemplarily, the overall profile of the jet flow ring 8 is cylindrical or circular truncated cone structure, the radial cross-sectional area of the jet flow ring 8 gradually decreases from the direction of the pulverized coal inlet to the pulverized coal outlet, similarly, the profile structure of the chamber inside the jet flow ring 8 is the same as that of the jet flow ring 8.
[0038] More specifically, the pulverized coal flow adjusting device 4 further comprises x annular wind resistance rings 9, each wind resistance ring 9 is fixedly arranged at one end of the jet flow ring 8 facing the pulverized coal inlet and extends along the length direction of the jet flow ring 8. Specifically, the wind resistance ring 9 is also annular tubular structure, the inner and outer annular faces of the wind resistance ring 9 correspond to and are located in the same annular face with the inner and outer annular faces of the jet flow ring 8. Specifically, the inner and outer annular faces of the wind resistance ring 9 are both cylindrical or conical surfaces. More specifically, the jet flow output from the air outlet or nozzle 10 of the jet flow ring 8 is further output along the wind resistance ring 9 and forms an annular or annular fan-shaped wind ring below the wind resistance ring 9, which is opposite to the direction of the pulverized coal flow in the jet flow pipe 11, effectively increasing the flow resistance of the pulverized coal in the jet flow pipe 11 and reducing the flow.
[0039] Specifically, please refer again to Figure 1The coal powder flow adjusting device 4 further comprises a control mechanism 6 and x coal powder concentration monitoring mechanisms 3, the x coal powder concentration monitoring mechanisms 3 are respectively arranged in the x coal powder conveying pipelines 2, in each coal powder conveying pipeline 2, the coal powder concentration monitoring mechanism 3 is located on the downstream side of the turbulent flow air ring 8 along the coal powder flow direction, the coal powder concentration monitoring mechanism 3 is further in communication connection with the control mechanism 6, the control mechanism 6 is further in communication connection with the adjusting valve 7, the control mechanism 6 can adjust the working state and working parameter of the x adjusting valves 7 according to the coal powder concentration information in the coal powder conveying pipeline 2 where the coal powder concentration monitoring mechanism 3 is located, that is, the control mechanism 6 receives the real-time concentration of the coal powder in the x coal powder conveying pipelines 2, makes a deviation judgment and guides the operation of the adjusting valve 6 to realize the adjustment of the coal powder concentration. Specifically, the control mechanism 6, the adjusting valve 7 and the coal powder concentration monitoring mechanism 3 can be in communication connection through a wired or wireless mode. The control mechanism 6 can be a PLC controller and the like, and the coal powder concentration monitoring mechanism 3 can be a concentration sensor and the like, which can be obtained from the market.
[0040] The process that the coal mill provided by the embodiment of the utility model realizes the uniformity of the coal powder concentration in the multiple coal powder conveying pipelines 2 at least includes: compressed air enters the turbulent flow air pipe 11, then passes through the adjusting valve 7, controls the flow of the compressed air injected into the turbulent flow air ring 8, the annular pipe structure of the turbulent flow air ring 8 effectively buffers and uniformly distributes the amount of the compressed air entering each nozzle 10, and forms a ring or ring-fan-shaped air ring below the wind resistance ring 9, which is opposite to the coal powder flow direction of the coal powder conveying pipeline 2, effectively increases the flow resistance of the coal powder in the coal powder conveying pipeline 2, reduces the flow of the coal powder, and thus realizes the purpose of the uniform flow of the coal powder in the coal powder conveying pipeline 2. When the coal powder concentration monitoring mechanism 3 detects that the coal powder concentration value in the coal powder conveying pipeline 2 is higher than the average value of the other coal powder conveying pipelines 2, the control mechanism 6 makes a judgment, increases the flow of the compressed air through the adjusting valve 7, increases the amount of the gas sprayed by the nozzle 10, and strengthens the wind resistance, and thus realizes the uniform flow of the coal powder. When the coal powder concentration monitoring mechanism 3 detects that the coal powder concentration value in the coal powder conveying pipeline 2 is less than or lower than the average value of the other coal powder conveying pipelines 2, the control mechanism 6 makes a judgment, reduces the flow of the compressed air through the adjusting valve 7, and maintains within a certain range, which can ensure that the nozzle 10 has a smaller air flow to flow out and avoid that the nozzle is blocked by the coal powder.
[0041] The coal mill provided by the embodiment of the utility model adopts the mode of increasing the wind resistance to adjust the coal powder concentration in the coal powder conveying pipeline, which not only can increase the reverse wind resistance in the coal powder conveying pipeline and reduce the coal powder flow concentration, but also can dilute the coal powder concentration in the region to a certain extent by adding the turbulent flow air in the turbulent flow air pipe, so that the primary air coal powder concentration entering the coal powder conveying pipeline is rapidly reduced, and thus the coal powder flow in the coal powder conveying pipeline is rapidly leveled.
[0042] The coal powder flow adjusting device of the coal mill provided by the embodiment of the utility model is based on online measurement data of coal powder concentration, an automatic adjusting valve is used for adjusting, data is determined by relying on a control mechanism, an adjusting error range is set, online automatic control is realized, instant adjusting is realized according to feedback, compared with a manual mechanical adjusting mode, the device has the advantages of short response time and high adjusting efficiency.
[0043] The wind resistance ring of the coal mill provided by the embodiment of the utility model can provide weak jet flow wind pressure under normal working conditions, and the spraying or the hole opening will not be blocked, and has basically no influence on the coal powder concentration in the air pipe.
[0044] It should be understood that the above embodiments are only for illustrating the technical concept and characteristics of the utility model, and the purpose is to enable those skilled in the art to understand the content of the utility model and implement it, and it cannot limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit and essence of the utility model should be covered within the protection scope of the utility model.
Claims
1. A pulverized coal flow regulating device, characterized in that, include: The system includes an air supply mechanism and y turbulent air rings. The turbulent air rings have hollow chambers inside and one or more air outlets. The air supply mechanism is connected to the chambers inside the y turbulent air rings. The turbulent airflow provided by the air supply mechanism can be output through the air outlets on the turbulent air rings to form a gas jet y≥2.
2. The pulverized coal flow regulating device according to claim 1, characterized in that: The turbulent air ring and the chamber inside the turbulent air ring are both annular structures, and the multiple air outlets are spaced apart and evenly distributed along the circumference of the turbulent air ring. And / or, multiple air outlets are disposed on the same end face of the turbulent air ring.
3. The pulverized coal flow regulating device according to claim 2, characterized in that: The turbulent air ring is a ring-shaped tubular structure; and / or, the overall outline of the turbulent air ring is a cylindrical or frustum-shaped structure.
4. The pulverized coal flow regulating device according to claim 1, characterized in that: The air supply mechanism is connected to the turbulent air ring via a turbulent air duct, and the turbulent air duct is also equipped with a regulating valve, which is used to regulate the flow rate of the turbulent airflow input into the turbulent air ring.
5. The pulverized coal flow regulating device according to claim 1, characterized in that: The pulverized coal flow regulating device further includes one or more nozzles, which are fixedly mounted on the turbulent air ring. Each nozzle corresponds to and is connected to an air outlet, and the multiple nozzles may have the same or different orientations.
6. The pulverized coal flow regulating device according to claim 1 or 5, characterized in that: The pulverized coal flow regulating device also includes an annular wind resistance ring, and the turbulent air ring is disposed on the wind resistance ring. The wind resistance ring is disposed along the axial direction of the turbulent air ring at one end near the air outlet, and the air outlet on the turbulent air ring is located within the cavity formed by the wind resistance ring.
7. The pulverized coal flow regulating device according to claim 6, characterized in that: The wind resistance ring is a ring-shaped tubular structure, and the inner and outer ring surfaces of the wind resistance ring correspond to the inner and outer ring surfaces of the turbulent air ring and are located in the same ring surface. Alternatively, the overall outline of the wind resistance ring is a cylindrical or frustum-shaped structure.
8. A coal mill, comprising a main body and x pulverized coal conveying pipes, wherein the x pulverized coal conveying pipes are respectively connected to a pulverized coal collecting chamber of the main body, and the pulverized coal processed within the main body can be carried by the output airflow through the pulverized coal collecting chamber into the x pulverized coal conveying pipes, and then output or enter downstream equipment via the x pulverized coal conveying pipes, characterized in that: The coal mill further includes a pulverized coal flow regulating device according to any one of claims 1-7, wherein y of the turbulent air rings are disposed in the pulverized coal collecting chamber and / or x of the pulverized coal conveying pipes, the plurality of turbulent air rings located in the pulverized coal collecting chamber are respectively disposed upstream of the inlet of x of the pulverized coal conveying pipes, the air outlet on the turbulent air ring is located on the upstream side of the turbulent air ring facing the pulverized coal flow, the airflow direction of the gas jet provided by the pulverized coal flow regulating device is opposite to the flow direction of the pulverized coal, and x≥2.
9. The coal mill according to claim 8, characterized in that: The coal powder collecting chamber has a conical structure, and the radial cross-sectional area of the coal powder collecting chamber gradually increases in the direction toward the coal powder conveying pipeline.
10. The coal mill according to claim 8, characterized in that: The coal mill also includes a control mechanism and x coal powder concentration monitoring mechanisms. The x coal powder concentration monitoring mechanisms are respectively installed in the x coal powder conveying pipes. In each coal powder conveying pipe, the coal powder concentration monitoring mechanism is located downstream of the turbulent air ring along the coal powder flow direction. The coal powder concentration monitoring mechanism is also communicatively connected to the control mechanism, and the control mechanism is also connected to the coal powder flow regulating device.