Air supply device and coal mill

Abstract

The air supply device comprises an air supply pipe, a cold air assembly and a measuring element, the two ends of the air supply pipe are provided with a hot air inlet and an air supply outlet respectively, the hot air inlet is provided with an adjusting valve, and the cold air assembly is connected to the air supply pipe and is close to the hot air inlet; a communication port of the cold air assembly and the air supply pipe is arranged in the circumferential direction of the air supply pipe, and the measuring element is located between the cold air assembly and the air supply outlet in the air flow direction of the air supply pipe. The communication port of the cold air assembly and the air supply pipe is arranged in the circumferential direction of the air supply pipe, so that cold air enters the air supply pipe in the circumferential direction of the air supply pipe, the contact area of the cold air and hot air is increased, the mixing uniformity of the cold air and the hot air is improved, and the flow of the mixed gas measured by the measuring element is closer to the flow of the mixed gas at the air supply outlet; the hot air flow at the hot air inlet is controlled according to the flow measured by the measuring element, so that the flow of the mixed gas conveyed by the air supply device is accurately controlled.

Description

Technical Field

[0001] The embodiments of the present disclosure belong to the technical field of coal mills, and particularly relate to an air supply device and a coal mill. Background Art

[0002] At present, the on-site layout of thermal power plants is becoming more and more compact, the mixing section of the pulverizer inlet air duct is relatively short, and the temperature field and velocity field of the cross section of the online primary air measurement element are unevenly distributed, resulting in inaccurate online primary air velocity and primary air temperature measurements, and ultimately inaccurate primary air volume measurements. There is even a situation where the primary air volume and the cold and hot primary air damper dampers change in the opposite direction, that is, when the cold and hot primary air dampers are opened wide, the primary air volume becomes smaller, resulting in problems such as large deviations and violent fluctuations in the primary air volume measurement at the pulverizer inlet.

[0003] Therefore, there is an urgent need for an air supply device to solve the problem of inaccurate measurement of measuring elements. Summary of the invention

[0004] The embodiments of the present disclosure aim to solve at least one of the technical problems existing in the prior art and provide an air supply device and a coal mill.

[0005] An embodiment of a first aspect of the present disclosure provides an air supply device, the air supply device comprising:

[0006] An air supply pipe, wherein the air supply pipe has a hot air inlet and an air supply outlet, the hot air inlet and the air supply outlet are respectively located at two ends of the air supply pipe, and the hot air inlet is provided with a regulating valve;

[0007] A cold air component, the cold air component is connected to the air supply pipe, the cold air component is arranged close to the hot air inlet, and the connecting opening between the cold air component and the air supply pipe is arranged along the circumference of the air supply pipe;

[0008] A measuring element is disposed in the air supply duct, along the air flow direction of the air supply duct, the measuring element is located between the cold air component and the air supply outlet, and the measuring element is used to measure the flow rate of the air supply duct.

[0009] In some embodiments of the present disclosure, the air supply duct includes a hot air section and a mixing air section, the hot air section and the mixing air section are connected, and along the wind direction, the hot air section is sequentially provided with the hot air inlet, the regulating valve and the cold air component, the connecting port between the cold air component and the hot air section is arranged along the circumference of the hot air section, and the air supply outlet is provided at one end of the mixing air section away from the hot air section.

[0010] In some embodiments of the present disclosure, the cold air component includes:

[0011] an annular air duct, the annular air duct is connected to the air supply duct, the annular air duct is arranged in an annular shape along the circumference of the air supply duct, and the connecting opening between the annular air duct and the air supply duct is arranged along the circumference of the air supply duct;

[0012] A cold air duct is provided with a cold air inlet, and the cold air duct is communicated with the annular air duct.

[0013] In some embodiments of the present disclosure, there are multiple communication ports, and the multiple communication ports are arranged at intervals along the circumference of the air supply pipe.

[0014] In some embodiments of the present disclosure, the annular air duct includes:

[0015] An annular pipe section, the annular pipe section is sleeved on the air supply pipe, the annular pipe section is an open annular structure, and both ends of the annular pipe section are respectively connected to the cold air pipe;

[0016] A connecting pipe section, wherein a plurality of the connecting pipe sections respectively connect the annular pipe section and the air supply pipe, and the plurality of the connecting pipe sections are arranged at intervals along the circumference of the air supply pipe, and the connection between each connecting pipe section and the air supply pipe forms the connecting port.

[0017] In some embodiments of the present disclosure, the cold air component also includes a diverter pipe, which includes a mainstream section and two diverter sections. The mainstream section is connected to the two diverter sections, the mainstream section is connected to the cold air pipe, and the two diverter sections are respectively connected to both ends of the annular pipe section.

[0018] In some embodiments of the present disclosure, a guide plate is provided in the air supply duct, and the guide plate is located at a turning point of the air supply duct.

[0019] In some embodiments of the present disclosure, a flow equalizing plate is provided in the air supply duct, and along the airflow direction of the air supply duct, the flow equalizing plate is provided upstream of the measuring element, and the flow equalizing plate is provided close to the measuring element.

[0020] In some embodiments of the present disclosure, a plurality of flow balancing holes are provided on the flow balancing plate, and the porosity of the flow balancing holes ranges from 60% to 75%.

[0021] An embodiment of the second aspect of the present disclosure provides a coal mill, which includes an air supply device according to any of the above embodiments.

[0022] The air supply device and coal mill of the disclosed embodiment include an air supply pipe, a cold air component and a measuring element. The cold air component is connected to the air supply pipe near the hot air inlet and the cold air component is communicated with the air supply pipe. The cold air component transports the cold air to the position of the air supply pipe near the hot air inlet to mix the cold air with the hot air. The connecting port of the cold air component and the air supply pipe is arranged along the circumference of the air supply pipe, so that the cold air in the cold air component enters the air supply pipe along the circumference of the air supply pipe, thereby increasing the contact area between the cold air and the hot air in the air supply pipe, and then increasing the mixing area of ​​the cold air and the hot air. The uniformity of the mixed gas obtained by combining; when the mixed gas flows along the wind direction of the air supply pipe to the measuring element, the flow rate of the evenly mixed mixed gas measured by the measuring element is closer to the flow rate of the mixed gas at the air supply outlet, thereby increasing the accuracy of the flow rate of the mixed gas measured by the measuring element; according to the precise flow rate of the mixed gas measured by the measuring element, the hot air flow rate at the hot air inlet is controlled through the regulating valve of the air supply pipe, thereby accurately controlling the flow rate of the mixed gas transported by the air supply device, and then accurately controlling the air supply volume of the coal mill, ensuring that the efficiency of the coal mill is maximized. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of an air supply device according to an embodiment of the present disclosure;

[0024] Figure 2 for Figure 1 A cross-sectional schematic diagram of the air supply device shown;

[0025] Figure 3 for Figure 1 The structural schematic diagram of the current equalizing plate is shown.

[0026] The reference numerals in the accompanying drawings represent the following:

[0027] 100. Air supply device;

[0028] 10. Air supply duct; 11. Hot air section; 12. Mixing air section; 101. Hot air inlet; 102. Air supply outlet;

[0029] 20. cold air assembly; 21. annular air duct; 211. annular pipe section; 212. connecting pipe section; 22. cold air duct; 23. diverter pipe; 231. main flow section; 232. diverter section; 201. cold air inlet; 202. connecting port;

[0030] 30. Measuring element;

[0031] 40. Regulating valve;

[0032] 50. Guide plate;

[0033] 60. Flow equalizing plate; 61. Flow equalizing hole. DETAILED DESCRIPTION

[0034] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0035] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0036] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0037] For ease of description, spatial relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is turned over, then the elements described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." can include both upper and lower orientations. The device can be oriented otherwise (rotated 90 degrees or in other directions) and the spatial relative descriptors used in the text are interpreted accordingly.

[0038] like Figures 1 to 3 As shown, an embodiment of the first aspect of the present disclosure provides an air supply device 100, which includes: an air supply pipe 10, a cold air component 20 and a measuring element 30. The air supply pipe 10 has a hot air inlet 101 and an air supply outlet 102, which are respectively located at the two ends of the air supply pipe 10, and the hot air inlet 101 is provided with a regulating valve 40. The cold air component 20 is connected to the air supply pipe 10, and the cold air component 20 is arranged close to the hot air inlet 101. The connecting port 202 between the cold air component 20 and the air supply pipe 10 is arranged along the circumference of the air supply pipe 10. The measuring element 30 is arranged in the air supply pipe 10, and along the wind flow direction of the air supply pipe 10, the measuring element 30 is located between the cold air component 20 and the air supply outlet 102. The measuring element 30 is used to measure the flow rate of the air supply pipe 10.

[0039] The air supply device 100 of the disclosed embodiment includes an air supply pipe 10, a cold air component 20 and a measuring element 30. The cold air component 20 is connected to the air supply pipe 10 near the hot air inlet 101 and the cold air component 20 is communicated with the air supply pipe 10. The cold air component 20 transports the cold air to the position of the air supply pipe 10 near the hot air inlet 101 to mix the cold air with the hot air. The connecting port 202 between the cold air component 20 and the air supply pipe 10 is arranged along the circumference of the air supply pipe 10, so that the cold air in the cold air component 20 enters the air supply pipe 10 along the circumference of the air supply pipe 10, thereby increasing the contact area between the cold air and the hot air in the air supply pipe 10, thereby improving the The uniformity of the mixed gas obtained by mixing high-cold air and hot air; when the mixed gas flows along the wind direction of the air supply pipe 10 to the measuring element 30, the flow rate of the uniformly mixed mixed gas measured by the measuring element 30 is closer to the flow rate of the mixed gas at the air supply outlet 102, thereby making the accuracy of the flow rate of the mixed gas measured by the measuring element 30; according to the precise flow rate of the mixed gas measured by the measuring element 30, the regulating valve 40 of the air supply pipe 10 controls the hot air flow at the hot air inlet 101, thereby accurately controlling the flow rate of the mixed gas delivered by the air supply device 100, and then accurately controlling the air supply volume of the coal mill, to ensure that the efficiency of the coal mill is maximized.

[0040] In some embodiments of the present disclosure, the air supply pipe 10 includes a hot air section 11 and a mixed air section 12, the hot air section 11 and the mixed air section 12 are connected, a hot air inlet 101 is provided at one end of the hot air section 11, and the other end of the hot air section 11 is connected to the mixed air section 12. The hot air section 11 is also provided with a regulating valve 40 and a cold air component 20. Along the wind flow direction, the cold air component 20 is provided downstream of the regulating valve 40, one end of the mixed air section 12 is aligned with the hot air section 11, and the other end of the mixed air section 12 is provided with an air supply outlet 102. The cold air component 20 is connected to the position of the hot air section 11 close to the mixed air section 12, and the cold air component 20 is connected to the position of the hot air section 11 close to the mixed air section 12. Hot air enters the hot air section 11 through the hot air inlet 101 and flows toward the mixing air section 12. Cold air enters the hot air section 11 through the cold air component 20, and the cold air is mixed with the hot air of the hot air section 11 to obtain a mixed gas. The mixed gas flows toward the mixing air section 12 and flows along the mixing air section 12 to the air supply outlet 102. When the mixed gas flows to the position of the measuring element 30, the measuring element 30 measures the mixed gas to obtain the flow rate of the mixed gas, and then adjusts the flow rate of the hot air through the regulating valve 40 arranged in the hot air section 11, so that the flow rate of the mixed gas measured by the measuring element 30 meets the demand.

[0041] Specifically, the cold air component 20 is arranged in a ring shape along the circumference of the hot air section 11, and the connecting port 202 between the cold air component 20 and the cold air section is arranged in a ring shape along the circumference of the hot air section 11, thereby increasing the contact area between the cold air and the hot air in the hot air section 11 of the air supply duct 10, thereby improving the uniformity of the mixed gas obtained by mixing the cold air and the hot air.

[0042] In some embodiments of the present disclosure, Figure 2 As shown, the cold air assembly 20 includes: an annular air duct 21 and a cold air duct 22. The cold air duct 22 has a cold air inlet 201. The cold air duct 22 is communicated with the annular air duct 21. The annular air duct 21 is connected to the air supply duct 10, and the annular air duct 21 is communicated with the hot air section 11 of the air supply duct 10. Cold air enters the cold air duct 22 from the cold air inlet 201 of the cold air duct 22, flows to the annular air duct 21 along the direction from the cold air duct 22 to the annular air duct 21, and enters the hot air section 11 from the annular air duct 21, so that the cold air is mixed with the hot air.

[0043] Specifically, the annular air duct 21 is arranged in a ring shape along the circumference of the hot air section 11 of the air supply duct 10, and the connecting port 202 between the annular air duct 21 and the hot air section 11 is arranged along the circumference of the hot air section 11, thereby increasing the contact area between the cold air and the hot air in the hot air section 11 of the air supply duct 10, and further improving the uniformity of the mixed gas obtained by mixing the cold air and the hot air.

[0044] In some embodiments of the present disclosure, there are multiple communication ports 202, and the multiple communication ports 202 are arranged at intervals along the circumference of the air supply pipe 10. The annular air duct 21 delivers cold air to the hot air section 11 through the multiple communication ports 202 arranged at intervals along the circumference of the hot air section 11 of the air supply pipe 10, and the cold air enters the hot air section 11 from the multiple communication ports 202 along the circumference of the hot air section 11, so as to increase the contact area between the cold air and the hot air, and make the cold air and the hot air mix more evenly.

[0045] In some other embodiments of the present disclosure, the communication opening 202 may be an annular structure, and the cold air is sent into the hot air section 11 through the communication opening 202 of the annular structure to increase the contact area between the cold air and the hot air. However, the cold air volume of the communication opening 202 of the annular structure far from the air inlet side is small, and it is difficult to make the cold air evenly distributed along the circumference of the hot air section 11. Therefore, in this embodiment, a plurality of communication openings 202 are arranged at intervals along the circumference of the hot air section 11 as a preferred solution.

[0046] In some embodiments of the present disclosure, the annular air duct 21 includes: an annular pipe section 211 and a connecting pipe section 212. Specifically, the annular pipe section 211 is sleeved on the air supply pipe 10. The annular pipe section 211 is an open annular structure. Both ends of the annular pipe section 211 are connected to the cold air pipe 22 respectively. The inner ring of the open annular air duct 21 is connected to the hot air section 11 of the air supply pipe 10 through a plurality of connecting pipe sections 212. The plurality of connecting pipe sections 212 are arranged at intervals along the circumference of the hot air section 11. A connecting port 202 is formed at the connection between each connecting pipe section 212 and the hot air section 11 of the air supply pipe 10. The cold air enters the open annular pipe section 211 through the cold air pipe 22, and enters the plurality of connecting pipe sections 212 through the annular pipe section 211, and enters the hot air section 11 of the air supply pipe 10 through the plurality of connecting ports 202 to mix with the hot air in the hot air section 11. Specifically, the annular pipe section 211 is an open rectangular ring, or an open circular ring.

[0047] The number of the connecting pipe sections 212 is two or more, and the two or more connecting pipe sections 212 are spaced apart along the circumference of the hot air section 11. The cold air is more evenly mixed into the hot air through the two or more connecting pipe sections 212, and the connecting pipe section 212 is arranged between the hot air section 11 and the annular pipe section 211, so that the annular air duct 21 has a tapered structure, so that the cold air can better penetrate and enter the hot air.

[0048] In some embodiments of the present disclosure, the cold air component 20 also includes a diversion pipe 23, which includes a mainstream section 231 and two diversion sections 232. One end of the mainstream section 231 is connected to the cold air pipe 22, and the other end of the mainstream section 231 is connected to the two diversion sections 232. The two diversion sections 232 are respectively connected to the two ends of the annular pipe section 211. The cold air in the cold air pipe 22 enters the mainstream section 231 and enters the two diversion sections 232 through the mainstream section 231 to divert the cold air. The two diverted cold airs enter the annular pipe section 211 through the two ends of the annular pipe section 211 respectively. The two cold airs flow along the annular pipe section 211 through the two ends and enter the hot air section 11 through multiple connecting pipe sections 212 during the flow. By dividing the cold air into two streams by the diversion section 232, the cold air can enter the annular pipe section 211 from both ends of the annular pipe section 211, thereby increasing the speed at which the cold air fills the annular pipe section 211 and making the cold air more evenly distributed along the hot air pipe.

[0049] In some embodiments of the present disclosure, a guide plate 50 is provided in the air supply pipe 10, and the guide plate 50 is located at the turning point of the air supply pipe 10. Specifically, the air supply pipe 10 is provided with two turning points, both of which are located in the mixing pipe section, and the inner wall of each turning point is provided with a pair of guide plates 50, one of the pair of guide plates 50 is provided on the inner curved side of the turning point, and the other of the pair of guide plates 50 is provided on the outer curved side of the turning point. The guide plate 50 mainly plays the role of airflow guidance and resistance reduction. The mixed air will deflect to one side after passing through the turning point, and the guide plate 50 can prevent deflection, reduce the resistance of the mixed air flow, and realize the mixed air flow rectification.

[0050] In some embodiments of the present disclosure, Figure 2 , Figure 3 As shown, a flow equalizer 60 is provided in the air supply pipe 10. Along the airflow direction of the air supply pipe 10, the flow equalizer 60 is provided upstream of the measuring element 30, and the flow equalizer 60 is provided close to the measuring element 30. The flow equalizer 60 can balance the flow resistance of the mixed wind and make the flow field more uniform to ensure the accuracy of the measurement of the measuring element 30. Specifically, the flow equalizer 60 is located within the range of 30 to 50 cm upstream of the measuring element 30, and the rectification effect of the flow equalizer 60 is the best.

[0051] In some embodiments of the present disclosure, Figure 3 As shown, the flow balancing plate 60 is provided with a plurality of flow balancing holes 61, and the porosity of the flow balancing holes 61 ranges from 60% to 75%. After the mixed air passes through the plurality of flow balancing holes 61 of the flow balancing plate 60, the speeds of the mixed air at each position are closer, and the flow field of the mixed air is more uniform, so as to achieve the purpose of rectification. Specifically determined by numerical simulation calculation, generally the porosity is between 60% and 75%, which can make the flow field of the mixed air most uniform.

[0052] An embodiment of the second aspect of the present disclosure provides a coal mill, which includes an air supply device 100 according to any one of the above embodiments.

[0053] The coal mill of the embodiment of the present disclosure includes an air supply device 100, which includes an air supply pipe 10, a cold air component 20 and a measuring element 30. The cold air component 20 is connected to the air supply pipe 10 near the hot air inlet 101 and the cold air component 20 is communicated with the air supply pipe 10. The cold air component 20 transports the cold air to the position of the air supply pipe 10 near the hot air inlet 101 so that the cold air is mixed with the hot air; the connecting port 202 between the cold air component 20 and the air supply pipe 10 is arranged along the circumference of the air supply pipe 10 so that the cold air in the cold air component 20 enters the air supply pipe 10 along the circumference of the air supply pipe 10, thereby improving the connection between the cold air and the hot air in the air supply pipe 10. contact area, thereby improving the uniformity of the mixed gas obtained by mixing the cold air and the hot air; when the mixed gas flows along the wind direction of the air supply pipe 10 to the measuring element 30, the flow rate of the evenly mixed mixed gas measured by the measuring element 30 is closer to the flow rate of the mixed gas at the air supply outlet 102, thereby making the accuracy of the flow rate of the mixed gas measured by the measuring element 30; according to the precise flow rate of the mixed gas measured by the measuring element 30, the regulating valve 40 of the air supply pipe 10 controls the hot air flow at the hot air inlet 101, thereby accurately controlling the flow rate of the mixed gas delivered by the air supply device 100, and then accurately controlling the air supply volume of the coal mill, to ensure that the efficiency of the coal mill is maximized.

[0054] It should be noted that the air supply device 100 in this embodiment can be used to deliver primary air to the coal mill. Specifically, the hot primary air enters the hot air section 11 through the hot air inlet 101 of the air supply pipe 10, and the cold primary air enters the cold air pipe 22 through the cold air inlet 201. The hot primary air and the cold primary air are mixed in the hot air section 11 of the air supply pipe 10 to form a primary mixed air. The primary mixed air enters the mixed air section 12, passes through the guide plate 50 and the flow equalizing plate 60, reaches the measuring element 30, and finally is discharged from the air supply device 100 through the air outlet of the mixed air section 12 and enters other demand devices. In other embodiments of the present disclosure, the air supply device 100 can be used to transport other gases that need to be mixed.

[0055] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present disclosure, but the present disclosure is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and substance of the present disclosure, and these modifications and improvements are also considered to be within the scope of protection of the present disclosure.

Claims

1. An air supply device, characterized in that: The air supply device comprises: An air supply pipe, wherein the air supply pipe has a hot air inlet and an air supply outlet, the hot air inlet and the air supply outlet are respectively located at two ends of the air supply pipe, and the hot air inlet is provided with a regulating valve; A cold air component, the cold air component is connected to the air supply pipe, the cold air component is arranged close to the hot air inlet, and the connecting opening between the cold air component and the air supply pipe is arranged along the circumference of the air supply pipe; A measuring element is disposed in the air supply duct, along the air flow direction of the air supply duct, the measuring element is located between the cold air component and the air supply outlet, and the measuring element is used to measure the flow rate of the air supply duct.

2. The air supply device according to claim 1, characterized in that: The air supply duct includes a hot air section and a mixing air section, and the hot air section and the mixing air section are connected. Along the wind flow direction, the hot air inlet, the regulating valve and the cold air component are sequentially provided on the hot air section. The connecting port between the cold air component and the hot air section is arranged along the circumference of the hot air section, and the air supply outlet is provided at one end of the mixing air section away from the hot air section.

3. The air supply device according to claim 1, characterized in that: The cold air component comprises: an annular air duct, the annular air duct is connected to the air supply duct, the annular air duct is arranged in an annular shape along the circumference of the air supply duct, and the connecting opening between the annular air duct and the air supply duct is arranged along the circumference of the air supply duct; A cold air duct is provided with a cold air inlet, and the cold air duct is communicated with the annular air duct.

4. The air supply device according to claim 3, characterized in that: There are multiple communication openings, and the multiple communication openings are arranged at intervals along the circumferential direction of the air supply pipe.

5. The air supply device according to claim 4, characterized in that: The annular air duct comprises: An annular pipe section, the annular pipe section is sleeved on the air supply pipe, the annular pipe section is an open annular structure, and both ends of the annular pipe section are respectively connected to the cold air pipe; A connecting pipe section, wherein a plurality of the connecting pipe sections respectively connect the annular pipe section and the air supply pipe, and the plurality of the connecting pipe sections are arranged at intervals along the circumference of the air supply pipe, and the connection between each connecting pipe section and the air supply pipe forms the connecting port.

6. The air supply device according to claim 5, characterized in that: The cold air component also includes a diverter pipe, which includes a main flow section and two diverter sections. The main flow section is connected to the two diverter sections, the main flow section is connected to the cold air pipe, and the two diverter sections are respectively connected to both ends of the annular pipe section.

7. The air supply device according to claim 1, characterized in that: A guide plate is arranged in the air supply pipe, and the guide plate is located at the turning point of the air supply pipe.

8. The air supply device according to claim 1, characterized in that: A flow equalizing plate is provided in the air supply pipe. Along the air flow direction of the air supply pipe, the flow equalizing plate is arranged upstream of the measuring element, and the flow equalizing plate is arranged close to the measuring element.

9. The air supply device according to claim 8, characterized in that: The flow balancing plate is provided with a plurality of flow balancing holes, and the porosity of the flow balancing holes ranges from 60% to 75%.

10. A coal mill, characterized in that: The coal mill includes the air supply device according to any one of claims 1 to 9.

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