Coal mill energy-saving type airflow disturbance air pipe with flow field optimization function

Abstract

The invention provides a coal mill energy-saving type airflow disturbance air pipe with a flow field optimization function, and relates to the technical field of coal mills, the coal mill energy-saving type airflow disturbance air pipe comprises an air supply vertical pipe, the top end of the air supply vertical pipe inputs hot air and is provided with a first air measuring element, the bottom end of the air supply vertical pipe communicates with a first bent pipe, and an arc-shaped flow guide plate is arranged on the upper arc-shaped face in the first bent pipe; the outlet end of the first bent pipe communicates with an air supply transverse pipe, a backflow sealing pipe is arranged at the end of the outlet end of the air supply transverse pipe, and an air outlet pipe is arranged on the top face of the outlet end of the air supply transverse pipe. The first flow equalizing plate is arranged in the air supply transverse pipe, and a second air measuring element is mounted on the air outlet side of the first flow equalizing plate; the cold air pipe is vertically arranged on one side wall of the top end of the air supply vertical pipe; the flow dividing module is mounted in the cold air pipe in an attached mode, and the flow dividing module comprises a first air guide module, a second air guide module and a third air guide module which are arranged in an attached mode from top to bottom; the flow dividing module can be adjusted to a designated mode, so that cold air can be effectively injected into hot air flow, and cold air and hot air are mixed more uniformly.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mills, and particularly to an energy-saving air flow disturbance air duct of a coal mill with a flow field optimization function. Background Art

[0002] Boilers for power generation usually adopt pulverized coal combustion technology, which requires very fine coal particles (generally, the diameter of more than 80% of the particles is less than 75 microns). The coal mill crushes and grinds the raw coal into fine powder, greatly increasing the surface area of the coal, enabling it to be fully mixed with air to achieve efficient combustion; in order to meet the combustion oxygen supply requirements of the coal mill, hot air is supplied to the coal mill through an air duct.

[0003] Such as Figure 13 is a cross-sectional view of the air duct of an existing coal mill. As Figure 14 and 15 are the temperature distribution diagrams of the air duct of an existing coal mill. The temperature simulation results show that under the existing layout conditions of the cold and hot primary air ducts, it is very difficult for the cold air to penetrate the hot air by relying solely on its own momentum, and a very long mixing section is required to fill the entire cross-section, resulting in extremely uneven flow field distribution in the air duct, with obvious high-temperature and low-temperature regions. It is urgent to optimize the cold air inlet of the coal mill air duct to solve the problem of uneven temperature distribution in the coal mill air duct. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides an energy-saving air flow disturbance air duct of a coal mill with a flow field optimization function, which solves the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention is realized through the following technical solutions:

[0006] An energy-saving air flow disturbance air duct of a coal mill with a flow field optimization function includes a vertical air supply pipe, the top of which inputs hot air and is equipped with a first air velocity measuring element. The bottom end of the vertical air supply pipe is connected to a first elbow. An arc-shaped guide plate is provided at the upper arc-shaped surface inside the first elbow. The outlet end of the first elbow is connected to a horizontal air supply pipe. A reflux sealing pipe is provided at the end of the outlet of the horizontal air supply pipe. An air outlet pipe is provided on the top surface of the outlet end of the horizontal air supply pipe.

[0007] A first flow equalizing plate is provided inside the horizontal air supply pipe, and a second air velocity measuring element is installed on the air outlet side thereof.

[0008] A cold air pipe is vertically provided on one side wall of the top end of the vertical air supply pipe. The cold air pipe is used to input cold air to regulate the temperature of the hot air.

[0009] The shunt module is fitted and installed inside the cold air duct. The shunt module includes a first air guiding module, a second air guiding module, and a third air guiding module which are arranged in a stacked manner from top to bottom. The first air guiding module and the third air guiding module are fixed inside the cold air duct and their air outlet ends are flush; the second air guiding module includes a second air guiding square pipe, a flexible air guiding square pipe, an end air outlet component, a traction component, and a walking driving component; the walking driving component is installed at the inner entrance end of the cold air duct, the second air guiding square pipe is slidably installed between the first air guiding module and the second air guiding module, the inner end of the second air guiding square pipe is connected to the end air outlet component through the flexible air guiding square pipe, and a traction component is arranged on the side wall of the second air guiding square pipe, and the traction end of the traction component is connected to the end air outlet component;

[0010] The second air guiding square pipe is slidably adjusted according to the hot air speed to change the air exhaust mode of the shunt module. When a section of the second air guiding square pipe moves inwards, the first air guiding module is closed, and when a second section moves inwards, the second air guiding module is closed; the air exhaust modes include a no cold air mode, a three-channel cold air mode, a two-channel cold air mode, and a single-channel cold air mode; in the single-channel cold air mode, the end air outlet component is in an inclined downward state and extends into the air supply vertical pipe.

[0011] The present invention provides an energy-saving air flow disturbance air duct for a coal mill with a flow field optimization function. Compared with the prior art, it has the following beneficial effects:

[0012] 1. Optimize the uniformity and mixing efficiency of the hot air flow field: In the present invention, a first wind measuring element is installed at the top of the air supply vertical pipe to accurately measure the inlet air speed, and an arc-shaped deflector is arranged on the arc-shaped surface above the inside of the first elbow to effectively block and disturb the turning air flow, enhance the mixing effect when the hot air turns, make the temperature distribution more uniform, and at the same time, by arranging a first flow equalizing plate in the air supply horizontal pipe, the discharged air flow is evenly dispersed to further stabilize the air flow state; an innovative shunt module is proposed inside the cold air duct, which has four modes: no cold air, three-channel cold air, two-channel cold air, and single-channel cold air, and realizes intelligent switching according to the hot air speed. When the hot air is at a low speed, the three-channel cold air is discharged three-dimensionally from the upper, middle, and lower dimensions to expand the contact surface and fully mix. When the hot air is at a medium speed, the first air guiding module is closed to enhance the cold air impact force, overcome the hot air impact force, and improve the mixing efficiency. When the hot air is at a high speed, only the main air guiding component exhausts air, and the end air outlet component extends into the hot air duct and discharges cold air obliquely downward, cutting into the hot air in an oblique cutting manner to simplify the mixing process.

[0013] 2. Improve the mixing efficiency and accuracy of hot and cold air: Through the coordinated action of the arc-shaped deflector of the first elbow pipe and the flow equalizing plate of the air supply cross pipe in the present invention, the former optimizes the turning and mixing of hot air, and the latter ensures the uniform and stable discharge of the air flow. Specifically, the flow splitting module in the cold air pipe can accurately control the cold air input mode according to different hot air speeds. In the three-channel cold air mode, the cold air is discharged three-dimensionally. In the two-channel cold air mode, the first air guiding module is closed to enhance the impact force. In the single-channel cold air mode, the air outlet component at the lower end extends into the pipe to reduce the discharge distance, so that the cold air is directly transported to the core area of the hot air, realizing the efficient mixing of hot and cold air and significantly improving the mixing efficiency and accuracy.

[0014] 3. Enhance the energy saving and adaptability of the system: Through the real-time monitoring of the hot air speed by the wind measuring element and the intelligent control of the flow splitting module in the present invention, the on-demand distribution of cold air is realized, avoiding the energy waste caused by excessive cold air input. Specifically, when cold air is not needed, the blocking square block blocks the second air guiding square pipe and the installation hole to ensure the normal circulation of hot air and reduce the loss of hot air dispersion. The second flow equalizing plate can extend or retract according to actual needs to further optimize the mixed air flow and improve the overall energy saving effect, so as to ensure that the coal mill can operate efficiently and stably under various operating conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1 Shows the schematic structural diagram of the energy-saving air flow disturbance air pipe of the coal mill of the present invention;

[0017] Figure 2 Shows the schematic cross-sectional structure diagram of the interior of the energy-saving air flow disturbance air pipe of the coal mill of the present invention;

[0018] Figure 3 Shows the schematic connection structure diagram of the air outlet end of the flow splitting module and the cold air pipe of the present invention;

[0019] Figure 4 Shows the schematic structure diagram of the air inlet end of the flow splitting module of the present invention;

[0020] Figure 5 Shows the schematic structure diagram of the traction component of the present invention;

[0021] Figure 6 Shows the schematic structure diagram of the first inlet blocking component of the present invention;

[0022] Figure 7Shows the schematic structural diagram of the second inlet plugging component of the present invention;

[0023] Figure 8 Shows the schematic bottom view structural diagram of the flow splitting module of the present invention;

[0024] Figure 9 Shows the schematic structural diagram of the driving component of the present invention;

[0025] Figure 10 Shows the schematic structural diagram of the dual-channel mode of the flow splitting module of the present invention;

[0026] Figure 11 Shows the schematic structural diagram of the single-channel mode of the flow splitting module of the present invention;

[0027] Figure 12 Shows the schematic structural diagram of the connection between the translation sliding groove and the guiding groove of the present invention;

[0028] Figure 13 Shows the schematic cross-sectional structure diagram of the pulverizer air duct in the background technology of the present invention;

[0029] Figure 14 Shows Figure 13 Schematic diagram of the temperature distribution of the side cross-section of the air duct of

[0030] Figure 15 Shows Figure 13 Schematic diagram of the temperature distribution of the top-down cross-section of the air duct of

[0031] Figure 16 Shows the schematic diagram of the temperature distribution of the side cross-section of the air duct of the present invention;

[0032] Figure 17 Shows the schematic diagram of the temperature distribution of the top-down cross-section of the air duct of the present invention;

[0033] As shown in the figure: 1. Air supply vertical pipe, 11. First air velocity measuring element, 12. Mounting hole, 2. First elbow, 21. Arc-shaped flow guiding plate, 3. Air supply horizontal pipe, 31. First flow equalizing plate, 32. Second air velocity measuring element, 33. Return air sealing pipe, 331. Second elbow, 332. Baffle pipe, 4. Air outlet pipe, 5. Cold air pipe, 51. Translation sliding groove, 6. First air guiding module, 61. First air guiding square pipe, 62. First outlet sealing plate, 63. First inlet sealing component, 631. Strip, 632. First plate body, 633. Second plate body, 6331. First opening and closing motor, 7. Second air guiding module, 71. Second air guiding square pipe, 711. First slider, 72. Travel driving component, 721. Fixed block, 722. Translation screw rod, 73. Traction component, 731. Back plate, 732. Take-up wheel, 733. Traction rope, 74. Flexible air guiding square pipe, 75. Air outlet frame, 751. Second slider, 76. Guide groove, 761. Translation section, 762. Arc section, 763. Magnet, 8. Third air guiding module, 81. Third air guiding square pipe, 82. Second outlet sealing plate, 83. Second inlet sealing component, 831. Third plate body, 832. Fourth plate body, 8321. Second opening and closing motor, 9. Sealing and flow disturbing component, 91. Side box, 92. Sealing square frame, 93. First driving rod, 94. Second flow equalizing plate, 95. Second driving rod. Detailed implementation manners

[0034] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0035] As an understanding of the technical concept of the present invention, the present invention proposes an optimization idea for the air flow field at the inlet of the coal mill. Specifically in implementation, it is preferred that the size of the hot air pipeline is 1000×1200×4 mm, and the size of the cold air pipeline is Φ630×4 mm. The distance between the existing air velocity measuring element and the cold air mixing point is 2200 mm.

[0036] As Figures 13 - 15 (is the distribution cloud map of the primary air flow field at the inlet of the existing coal mill) and Table 1 below.

[0037] Table 1: Flow field uniformity index of the original online air volume measurement section under the existing air duct layout conditions

[0038]

[0039] The numerical simulation results show that, under the existing cold and hot air duct layout conditions, it is very difficult for the cold air to penetrate the hot air solely relying on its own momentum, and it requires a very long mixing section to fill the entire cross-section, resulting in extremely uneven distribution of the primary air flow field at the on-line measurement cross-section, with obvious high-speed and low-speed areas, as well as obvious high-temperature and low-temperature areas. The relative standard deviation of the flow velocity distribution at the cross-section of the air velocity measuring element reaches 18.1%, and the relative standard deviation of the temperature distribution is 7.9%. Based on this, the present invention proposes an air flow field optimization technology at the mill inlet to solve the problem of extremely uneven distribution of the air flow field at the mill inlet.

[0040] To solve the technical problems in the background art, the following energy-saving air flow disturbance air duct for a mill with a flow field optimization function is provided:

[0041] Combined Figures 1 - 12 As shown, the energy-saving air flow disturbance air duct for a mill with a flow field optimization function provided by the present invention includes a vertical air supply pipe 1, the top of which inputs hot air and is equipped with a first air velocity measuring element 11. The bottom end of the vertical air supply pipe 1 is connected to a first elbow 2. An arc-shaped guide plate 21 is provided at the upper arc surface inside the first elbow 2. The outlet end of the first elbow 2 is connected to a horizontal air supply pipe 3. The end of the outlet end of the horizontal air supply pipe 3 is provided with a return air sealing pipe 33, and an air outlet pipe 4 is provided on the top surface of the outlet end of the horizontal air supply pipe 3; The return air sealing pipe 33 includes a second elbow 331 and a blocking pipe 332. The outlet end of the horizontal air supply pipe 3 is provided with a second elbow 331, and the second elbow 331 is used to horizontally adjust the air outlet direction. The air outlet end of the second elbow 331 is provided with a blocking pipe 332. The side cross-section of the blocking pipe 332 is a right triangle, and the included angle a between the sealing pipe and the horizontal air supply pipe 3 is preferably 100°-150°;

[0042] A first flow equalizing plate 31, which is arranged in the horizontal air supply pipe 3, and a second air velocity measuring element 32 is installed on its air outlet side;

[0043] A cold air pipe 5, which is vertically arranged on one side wall of the top end of the vertical air supply pipe 1, and the cold air pipe 5 is used to input cold air to control the temperature of the hot air;

[0044] A flow splitting module, which is fitted and installed inside the cold air pipe 5. The flow splitting module includes a first air guiding module 6, a second air guiding module 7, and a third air guiding module 8 that are fitted and arranged from top to bottom. The first air guiding module 6 and the third air guiding module 8 are fixed inside the cold air pipe 5 and their air outlet ends are flush; The second air guiding module 7 includes a second air guiding square pipe 71, a flexible air guiding square pipe 74, an end air outlet component, a traction component 73, and a walking driving component 72; The walking driving component 72 is installed at the inner end of the cold air pipe 5. The second air guiding square pipe 71 is slidably installed between the first air guiding module 6 and the second air guiding module 7. The inner end of the second air guiding square pipe 71 is connected to the end air outlet component through the flexible air guiding square pipe 74. A traction component 73 is provided on the side wall of the second air guiding square pipe 71, and the traction end of the traction component 73 is connected to the end air outlet component;

[0045] The second air guide square pipe 71 is slidably adjusted according to the hot air speed to change the exhaust air mode of the shunt module. When one section of the second air guide square pipe 71 moves inwards, the first air guide module 6 is closed. When the second section moves inwards, the second air guide module 7 is closed. The exhaust air modes include no cold air mode, three-channel cold air mode, double-channel cold air mode, and single-channel cold air mode. In the single-channel cold air mode, the end air outlet component extends into the air supply vertical pipe 1 in an inclined downward state.

[0046] Specifically, the exhaust air modes are as follows:

[0047] In the no cold air mode: The air outlet ends of the first air guide module 6, the second air guide module 7, and the third air guide module 8 are all closed. The traction component 73 is retracted, and the end air outlet component is placed flat in the cold air pipe 5.

[0048] In the three-channel cold air mode: The hot air speed is low. The air outlet ends of the first air guide module 6, the second air guide module 7, and the third air guide module 8 are all opened. The traction component 73 pulls the end air outlet component to be placed flat in the cold air pipe 5.

[0049] In the double-channel cold air mode: The hot air speed is medium. The second air guide square pipe 71 moves inwards once, and the inlet end of the first air guide module 6 is closed. The end air outlet component extends into the cold air pipe 5, and the end air outlet component forms a flow blocking barrier above the outlet end of the second air guide module 7.

[0050] In the single-channel cold air mode: The hot air speed is high. The second air guide square pipe 71 moves inwards twice, and the inlet end of the second air guide module 7 is closed. The traction component 73 is released and unlocked. The end air outlet component extends into the hot air pipe and is tilted during the extension process until the air outlet is tilted downward.

[0051] In the above solutions:

[0052] 1. The first wind measurement element 11 can measure the inlet air speed of the air supply vertical pipe 1 to provide parameters for the operation of the shunt module. An arc-shaped flow guide plate 21 is added at the first elbow 2 to block and disturb the air flow at the first elbow 2, enhancing the turning and mixing effect and making the temperature more uniform. A first flow equalizing plate 31 is arranged at the air supply horizontal pipe 3 to disperse the air flow to be discharged, making the discharged air flow more uniform and stable. A second wind measurement element 32 is added on the air outlet side of the first flow equalizing plate 31 to measure the air outlet speed. The first wind measurement element 11 and the second wind measurement element 32 are exemplarily selected as SLFS-MF wind speed sensors.

[0053] 2. A shunt module is added in the cold air pipe 5. The shunt module has four working modes: no cold air mode, three-channel cold air mode, double-channel cold air mode, and single-channel cold air mode. The following effects can be brought:

[0054] 2.1 When the hot air temperature meets the requirements, the first air guiding module 6, the second air guiding module 7, and the third air guiding module 8 of the flow splitting module are in a closed state;

[0055] 2.2 When the hot air velocity is relatively low, the impact force of the hot air is small at this time. The first air guiding module 6, the second air guiding module 7, and the third air guiding module 8 are all opened, and cold air is discharged three-dimensionally from the upper, middle, and lower dimensions. The contact surface between the cold air and the hot air is wider and the mixing is more sufficient;

[0056] 2.3 When the hot air velocity is moderate, if the cold air flow is divided into three strands, the impact force of the cold air is insufficient and it is not easy to overcome the impact force of the hot air, resulting in poor mixing effect. At this time, the first air guiding module 6 that is first impacted can be closed, and the walking driving component 72 drives the second air guiding square pipe 71 to move inwards for a certain distance. In this way, the air flow can be discharged only through the third air guiding module 8 and the second air guiding square pipe 71, the impact force of the air flow increases, and the cold air is more likely to rush into the hot air for mixing;

[0057] When the second air guiding square pipe 71 moves inwards for a certain distance, it can push the end air outlet component to extend into the air supply vertical pipe 1 for a certain distance. In this way, the end air outlet component can block and disturb the air flow, reduce the hot air impact force for easy mixing, and the penetration of the end air outlet component can shorten the discharge distance. In this way, the discharged cold air directly extends into the air supply vertical pipe 1, and the cold air and the hot air are more convenient to mix; the extended end air outlet component can also form a blocking barrier above the third air guiding module 8. In this way, the impact received at the outlet of the third air guiding module 8 is smaller, and the cold air discharged from the third air guiding module 8 is more likely to mix with the hot air.

[0058] 2.4 When the hot air velocity is high, the impact force of the two strands of cold air is insufficient. At this time, the third air guiding module 8 can be closed so that the cold air is only discharged under pressure through the second air guiding square pipe 71, so that the cold air can rush into the hot air for mixing; the walking driving component 72 drives the second air guiding square pipe 71 to move inwards for the second section and closes the second air guiding module 7. In this way, the air flow can be discharged only through the second air guiding square pipe 71;

[0059] When the second air guiding square pipe 71 moves inwards for the second section, the traction component 73 will be unlocked, so that the end air outlet component is adjusted to an inclined downward state in the air supply vertical pipe 1, and the penetration depth increases, and the flexible air guiding square pipe 74 deforms accordingly; in this way, the cold air discharged from the end air outlet component is discharged obliquely downward, so that the cold air obliquely cuts into the hot air downward, and the mixing is more convenient; as Figure 16 and Figure 17 shown, the temperature of the air duct after being regulated by the flow splitting module is significantly more uniform.

[0060] 3. When the end air outlet component does not need to bend and change direction, the traction component 73 can be retracted, so that the end air outlet component is close to the second air guiding square pipe 71. In this way, the end air outlet component can be firmly placed at the air outlet end of the second air guiding square pipe 71, and the flexible air guiding square pipe 74 is compressed and retracted.

[0061] In this embodiment, the first air guiding module 6 includes a first air guiding square pipe 61, a first outlet blocking plate 62, and a first inlet blocking component 63. The air outlet of the first air guiding square pipe 61 is conical. The top end of the first outlet blocking plate 62 is rotatably installed on the inner top surface of the air outlet end of the first air guiding square pipe 61. The first inlet blocking component 63 is installed at the air inlet end of the first air guiding square pipe 61. When the first inlet blocking component 63 blocks the first air guiding module 6, an inclined flow guiding structure is formed to allow the air flow to enter the second air guiding square pipe 71 and the third air guiding module 8.

[0062] In the above solution: The cold air is output through the first air guiding square pipe 61. When there is an air flow, the first outlet blocking plate 62 is blown up and opened. When there is no air flow, the first outlet blocking plate 62 falls and closes under the action of gravity, preventing the hot air in the air supply vertical pipe 1 from flowing back into the first air guiding square pipe 61. The outlet of the first air guiding square pipe 61 is designed to be conical, which can increase the exhaust pressure. The first inlet blocking component 63 can block the inlet end of the first air guiding square pipe 61.

[0063] If the first inlet blocking component 63 directly and flatly blocks the first air guiding square pipe 61, it will block and disturb the input cold air, affecting the smooth output of the cold air. To solve the above problem, the following solution is given: The first inlet blocking component 63 includes a strip 631, a first plate body 632, and a second plate body 633. One end of the second plate body 633 is rotatably connected to the top end of the air inlet of the first air guiding square pipe 61 and a first opening and closing motor 6331 is rotatably connected and installed. The other end of the second plate body 633 is rotatably connected to the first plate body 632. The outer end of the first plate body 632 is rotatably connected to the strip 631. The strip 631 is slidably installed on the inner top surface of the cold air pipe 5. When the second plate body 633 rotates downward to block the air inlet of the first air guiding square pipe 61, the first plate body 632 rotates downward to an inclined state to guide the air flow into the second air guiding square pipe 71.

[0064] In the above solution: The first opening and closing motor 6331 drives the second plate body 633 to rotate downward. The second plate body 633 pulls the first plate body 632 to rotate downward. The strip 631 translates along the inner top surface of the cold air pipe 5. Finally, the second plate body 633 blocks the second air guiding square pipe 71, and the first plate body 632 is adjusted to an inclined state. In this way, the first plate body 632 can guide the cold air into the second air guiding square pipe 71. The two ends of the second plate body 633 are rotationally connected in a damped manner. The first plate body 632 and the strip 631 are rotationally connected in a damped manner, so that the first plate body 632 and the second plate body 633 can be fixedly held at the corresponding rotation angles. The strip 631 is slidably connected in a damped manner and can maintain the corresponding moving position.

[0065] In this embodiment, the third air guiding module 8 includes a third air guiding square pipe 81, a second outlet blocking plate 82, and a second inlet blocking component 83. The air outlet of the third air guiding square pipe 81 is conical. The top end of the second outlet blocking plate 82 is rotatably installed on the inner top surface of the air outlet end of the first air guiding square pipe 61. The air inlet end of the third air guiding square pipe 81 is equipped with a second inlet blocking component 83. The second inlet blocking component 83 has the same structure as the first inlet blocking component 63. When the second inlet blocking component 83 blocks the third air guiding module 8, an inclined air guiding structure is formed, so that the air flow only enters the second air guiding square pipe 71.

[0066] In the above solution: The cold air is output through the third air guiding square pipe 81. When there is an air flow, the second outlet blocking plate 82 is blown up and opened upward. When there is no air flow, the second outlet blocking plate 82 falls and closes under the action of gravity, preventing the hot air in the air supply vertical pipe 1 from flowing back into the third air guiding square pipe 81. The outlet of the third air guiding square pipe 81 is designed to be conical, which can increase the exhaust pressure. The working process of the second inlet blocking component 83 is the same as that of the first inlet blocking component 63. The second inlet blocking component 83 includes a third plate body 831, a fourth plate body, and a second opening and closing motor 8321. The fourth plate body 832 is rotatably connected to the bottom of the inlet end of the third air guiding square pipe 81, and the second opening and closing motor 8321 is installed at the rotation connection. The second inlet blocking component 83 can be adjusted to an inclined upward state, so that the air flow is guided upward into the second air guiding square pipe 71.

[0067] In this embodiment, first sliders 711 are provided on both side walls of the second air guiding square pipe 71. The first sliders 711 are horizontally slid and embedded in the inner translation chute 51 of the cold air pipe 5. The traction component 73 includes a back plate 731, a winding wheel 732, and a traction rope 733. The back plate 731 is arranged at the air outlet end of the side wall of the second air guiding square pipe 71. A winding wheel 732 is provided on the outer wall of the back plate 731, and a traction rope 733 is wound around the outer wall of the winding wheel 732. The whole traction component 73 is placed in the translation chute 51, and the end of the traction rope 733 is connected to the end air outlet component. By using the winding wheel 732, the retraction and release of the traction rope 733 can be controlled, and thus the retraction and release of the air outlet frame 75 and the flexible air guiding hose can be controlled simultaneously, making the closing movement and dispersed operation of the three-section second air guiding module 7 more stable and smooth.

[0068] In this embodiment, the length of the first air guiding square pipe is greater than the length of the third air guiding square pipe. When the second air guiding square pipe is in the initial position, the air inlet end of the second air guiding square pipe is located outside the air inlet end of the first air guiding square pipe.

[0069] In this embodiment, the walking driving component 72 includes a translation screw 722 and a fixed block 721. The fixed block 721 is fixedly arranged on the inner wall of the inlet end of the cold air duct 5. One end of the translation screw 722 is rotatably arranged in the fixed block 721, and the other threaded end of the translation screw 722 extends into the second air guiding square pipe 71. The second air guiding square pipe 71 can be driven to move by using the translation screw 722, and a motor for driving the translation screw 722 to rotate is arranged outside the fixed block 721.

[0070] In order to enable the end air outlet component to penetrate into the air supply vertical pipe 1 and change the air outlet direction, the following solution is provided:

[0071] The end air outlet component includes an air outlet frame 75 and a guide groove 76. Second sliders 751 are arranged on both sides of the air outlet frame 75. The end of the traction rope 733 is connected to the second slider 751. The guide grooves 76 are symmetrically arranged on the inner wall of the air supply vertical pipe 1. The guide groove 76 includes a translation section 761 and an arc section 762. The inlet of the translation section 761 is aligned and communicated with the translation sliding groove 51 of the cold air duct 5. The outlet of the translation section 761 is provided with an arc section 762 extending downward; when the second air guiding square pipe 71 moves inward for the first time, the air outlet frame 75 moves to the translation section 761; when the second air guiding square pipe 71 moves inward for the second time, the air outlet frame 75 moves along the arc section 762 under its own weight, and the slider is magnetically attracted and positioned by a magnet 763 at the inner end of the arc section 762.

[0072] In the above solution: when the end air outlet component is stressed, the second slider 751 of the air outlet frame 75 first moves into the translation section 761 along the translation sliding groove 51, and then moves into the arc section 762. By using the support and guiding force of the arc section 762, the gravity of the air outlet frame 75, and the thrust received by the air outlet frame 75, the air outlet frame 75 moves downward along the arc section 762 and adjusts to a state of inclining downward, and penetrates deeper into the air supply vertical pipe 1; a magnet 763 is arranged at the end of the arc section 762, which can adsorb and position the second slider 751.

[0073] Since the air outlet frame 75 is a flat structure as a whole and the installation space is limited, it is impossible to set the same structure as the first outlet blocking plate 62. To solve the problem of blocking the second air guiding square pipe 71, the following solution is provided: The flow splitting module further includes a blocking and flow disturbing component 9, and the blocking and flow disturbing component 9 is arranged on the other side wall at the top of the air supply vertical pipe 1; the blocking and flow disturbing component 9 includes a side box 91 and a blocking square frame 92. An installation hole 12 is opened on the side surface of the air supply vertical pipe 1 opposite to the cold air duct 5. A side box 91 is arranged outside the installation hole 12. The blocking square frame 92 is horizontally and dampingly slidably installed inside the side box 91, and a first driving rod 93 is arranged at the outer end of the blocking square frame 92; in the no-wind mode, the blocking square frame 92 blocks the second air guiding square pipe 71.

[0074] In the above solution: when cold air is not required to be input, the driving rod drives the blocking square box 92 to move into the air supply vertical pipe 1. One end face of the blocking square box 92 blocks the second air guiding square pipe 71, and the other end face blocks the mounting hole 12. At the same time, hot air can flow normally;

[0075] To make the mixed and discharged air flow more uniform and the mixing effect better; in this embodiment, the blocking and flow disturbing assembly 9 further includes a second flow equalizing plate 94. The second flow equalizing plate 94 is attached to the bottom surface of the blocking square box 92. The second flow equalizing plate 94 is horizontally and dampingly slidably installed in the side box 91. The back of the second flow equalizing plate 94 is connected to a second driving rod 95.

[0076] In the above solution, according to actual needs, the second flow equalizing plate 94 can be extended for use or retracted for storage. The second driving rod 95 drives the second flow equalizing plate 94 to extend into the air supply vertical pipe 1. The second flow equalizing plate 94 is placed at the bottom of the outlet of the third air guiding square pipe 81. After the cold air and the hot air are mixed, they can be evenly mixed again through the second flow equalizing plate 94.

[0077] The specific implementation process of the above embodiment is as follows:

[0078] In the no cold air mode: the first air guiding square pipe 61, the air outlet frame 75, and the third air guiding square pipe 81 are all retracted into the cold air pipe 5, and the inner ends of each air guiding square pipe are flush with the inner end of the cold air pipe 5; the first outlet blocking plate 62 and the second outlet blocking plate 82 block the air flow, and the first driving rod 93 drives the blocking square box 92 to block the air outlet frame 75;

[0079] The air supply vertical pipe 1 normally conveys hot air. The hot air is disturbed by the arc-shaped deflector 21 and then passes through the first flow equalizing plate 31 and is output to the air outlet pipe 4;

[0080] In the three-way cold air mode: the hot air speed (15 - 20 m / s) is low;

[0081] The blocking square box 92 resets and retracts. The external fan conveys cold air into the cold air pipe 5, and then the cold air is shunted into the first air guiding square pipe 61, the second air guiding square pipe 71, and the third air guiding square pipe 81. The first outlet blocking plate 62 and the second outlet blocking plate 82 at the outlet ends of the first air guiding square pipe 61 and the third air guiding square pipe 81 are lifted by the air flow;

[0082] The air flow enters the input hot air and is mixed with the hot air and output, changing the hot air temperature;

[0083] In the two-way cold air mode: the hot air speed (20 - 27 m / s) is medium;

[0084] The translation screw 722 rotates to drive the second air guiding square pipe 71 to move inward once. The air outlet frame 75 enters the air supply vertical pipe 1. The traction motor moves along the translation chute 51, and the second slider 751 enters the translation section 761 of the guiding groove 76;

[0085] After the air outlet frame 75 extends in and is in place, the air inlet end of the second air guiding square pipe is flush with the air inlet end of the first air guiding square pipe. The first opening and closing motor 6331 drives the second plate body 633 to rotate downward, and then drives the first plate body 632 to rotate downward. The strip 631 slides along the inner top surface of the cold air pipe 5. Finally, the second plate body 633 blocks the inlet of the first air guiding square pipe 61, and the first plate body 632 forms a downward flow guiding structure;

[0086] In the single-channel cold air mode: The hot air speed (≥28 m / s) is high;

[0087] The translation screw rod 722 rotates to drive the second air guiding square pipe 71 to move inward for the second time. The second slider 751 leaves the translation section 761 and enters the arc section 762. At the same time, the winding wheel 732 releases the traction rope 733, so that the air outlet frame 75 is gradually adjusted to rotate obliquely downward, and the flexible air guiding square pipe 74 is stretched. Finally, the magnetic block 763 adsorbs the second slider 751;

[0088] After the air outlet frame 75 extends in and is in place, the air inlet end of the second air guiding square pipe is flush with the air inlet end of the third air guiding square pipe. The second opening and closing motor 8321 drives the fourth plate body 832 to rotate upward, and then drives the third plate body 831 to rotate upward. Finally, the fourth plate body 832 blocks the inlet of the third air guiding square pipe 81, and the third plate body 831 forms an upward flow guiding structure.

[0089] In this embodiment, as Figures 16 - 17 shown, it is the optimized temperature distribution cloud map of the air duct flow field. As shown in Table 2 below, the numerical simulation results show that after optimization, the uniformity of the flow field temperature field distribution of the measured pipe cross-section has been greatly improved. The relative standard deviation of the flow velocity distribution has been reduced to 7.9%, and the relative standard deviation of the temperature distribution has been reduced to about 2.5%. The flow field environment of the wind measurement element has been greatly improved.

[0090] Table 2: Flow field uniformity index of the online air volume measurement cross-section after optimization

[0091]

[0092] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent in such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the said element.

[0093] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An energy-saving air flow disturbance air duct for a coal mill with a flow field optimization function, characterized in that, Comprising: A vertical air supply pipe, with hot air input at its top end and a first air velocity measuring element installed. The bottom end of the vertical air supply pipe is connected to a first elbow pipe. An arc-shaped flow guiding plate is provided at the upper arc-shaped surface inside the first elbow pipe. The outlet end of the first elbow pipe is connected to a horizontal air supply pipe. A return air sealing pipe is provided at the end of the outlet end of the horizontal air supply pipe. An air outlet pipe is provided on the top surface of the outlet end of the horizontal air supply pipe; A first uniform flow plate, which is arranged inside the horizontal air supply pipe, and a second air velocity measuring element is installed on its air outlet side; A cold air pipe, which is vertically arranged on one side wall of the top end of the vertical air supply pipe, and the cold air pipe is used to input cold air to regulate the temperature of the hot air; A flow splitting module, which is fitted and installed inside the cold air pipe. The flow splitting module includes a first air guiding module, a second air guiding module, and a third air guiding module that are arranged in a fitting manner from top to bottom. The first air guiding module and the third air guiding module are fixed inside the cold air pipe and their air outlet ends are flush; The second air guiding module includes a second air guiding square pipe, a flexible air guiding square pipe, an end air outlet component, a traction component, and a walking driving component; The walking driving component is installed at the inner entrance end of the cold air pipe. The second air guiding square pipe is slidably installed between the first air guiding module and the second air guiding module. The inner end of the second air guiding square pipe is connected to the end air outlet component through the flexible air guiding square pipe. A traction component is provided on the side wall of the second air guiding square pipe, and the traction end of the traction component is connected to the end air outlet component; The second air guiding square pipe is slidably adjusted according to the hot air velocity to change the air exhaust mode of the flow splitting module. When a section of the second air guiding square pipe moves inwards, the first air guiding module is closed. When a second section moves inwards, the second air guiding module is closed; The air exhaust mode includes a no cold air mode, a three-channel cold air mode, a two-channel cold air mode, and a single-channel cold air mode; In the single-channel cold air mode, the end air outlet component is in an inclined downward state and extends into the vertical air supply pipe.

2. The energy-saving air flow disturbance air duct for a coal mill with a flow field optimization function according to claim 1, characterized in that: The specific air exhaust mode is as follows: In the no cold air mode: The air outlet ends of the first air guiding module, the second air guiding module, and the third air guiding module are all closed; The traction component is retracted, and the end air outlet component is placed flush inside the cold air pipe; In the three-channel cold air mode: The hot air velocity is low, and the air outlet ends of the first air guiding module, the second air guiding module, and the third air guiding module are all opened; The traction component pulls the end air outlet component and places it flush inside the cold air pipe; In the two-channel cold air mode: The hot air velocity is medium, the second air guiding square pipe moves inwards once, the inlet end of the first air guiding module is closed, the end air outlet component extends into the cold air pipe, and the end air outlet component forms a flow blocking barrier above the air outlet end of the second air guiding module; In the single-channel cold air mode: The hot air velocity is high, the second air guiding square pipe moves inwards twice, the inlet end of the second air guiding module is closed, the traction component is released and unlocked, and the end air outlet component extends into the hot air pipe and is tilted and adjusted during the extension process until the air outlet is tilted downward.

3. The energy-saving air flow disturbance air duct of the coal mill with a flow field optimization function according to claim 2, characterized in that: The first air guiding module includes a first air guiding square pipe, a first outlet blocking plate, and a first inlet blocking component. The air outlet of the first air guiding square pipe is conical. The top end of the first outlet blocking plate is rotatably installed on the inner top surface of the air outlet end of the first air guiding square pipe; A first inlet blocking component is installed at the air inlet end of the first air guiding square pipe; When the first inlet blocking component blocks the first air guiding module, an inclined flow guiding structure is formed to make the air flow into the second air guiding square pipe and the third air guiding module.

4. The energy-saving air flow disturbance air duct for a coal mill with a flow field optimization function according to claim 3, characterized in that: The first inlet blocking component includes a strip, a first plate body, and a second plate body. One end of the second plate body is rotatably connected to the top of the air inlet of the first air guiding square pipe and is rotatably connected with a first opening and closing motor. The other end of the second plate body is rotatably connected to the first plate body. The outer end of the first plate body is rotatably connected to the strip, and the strip is slidably installed on the inner top surface of the cold air pipe. When the second plate body rotates downward to block the air inlet of the first air guiding square pipe, the first plate body rotates downward to an inclined state to guide the air flow into the second air guiding square pipe.

5. The energy-saving air flow disturbance air duct for a coal mill with a flow field optimization function according to claim 3, characterized in that: The third air guiding module includes a third air guiding square pipe, a second outlet blocking plate, and a second inlet blocking component. The air outlet of the third air guiding square pipe is conical, and the top end of the second outlet blocking plate is rotatably installed on the inner top surface of the air outlet end of the first air guiding square pipe. The second inlet blocking component is installed at the air inlet end of the third air guiding square pipe. The second inlet blocking component has the same structure as the first inlet blocking component. When the second inlet blocking component blocks the third air guiding module, an inclined diversion structure is formed to make the air flow only enter the second air guiding square pipe.

6. The energy-saving air flow disturbance air duct of the coal mill with a flow field optimization function according to claim 5, characterized in that: First sliders are provided on both side walls of the second air guiding square pipe, and the first sliders are horizontally slidably embedded in the inner translation chute of the cold air pipe. The traction component includes a back plate, a winding wheel, and a traction rope. The back plate is arranged at the air outlet end of the side wall of the second air guiding square pipe. A winding wheel is provided on the outer wall of the back plate, and a traction rope is wound around the outer wall of the winding wheel. The whole traction component is placed in the translation chute, and the end of the traction rope is connected to the end air outlet component.

7. The energy-saving air flow disturbance air duct for a coal mill with a flow field optimization function according to claim 1, characterized in that: The walking driving component includes a translation screw rod and a fixed block. The fixed block is fixedly arranged on the inner wall of the inlet end of the cold air pipe, one end of the translation screw rod is rotatably arranged in the fixed block, and the other end of the threaded translation screw rod extends into the second air guiding square pipe.

8. The energy-saving air flow disturbance air duct for a coal mill with a flow field optimization function according to claim 1, characterized in that: The end air outlet component includes an air outlet frame and a guiding groove. Second sliders are provided on both sides of the air outlet frame, and the end of the traction rope is connected to the second sliders. The guiding grooves are symmetrically opened on the inner wall of the air supply vertical pipe. The guiding groove includes a translation section and an arc section. The inlet of the translation section is aligned and communicated with the translation chute of the cold air pipe, and the outlet of the translation section is provided with an arc section extending downward. When the second air guiding square pipe moves inward for the first time, the air outlet frame moves to the translation section. When the second air guiding square pipe moves inward for the second time, the air outlet frame moves along the arc section under its own weight, and the slider is magnetically attracted and positioned by the magnet at the inner end of the arc section.

9. The energy-saving air flow disturbance air duct of the coal mill with a flow field optimization function according to claim 1, characterized in that: The flow splitting module further includes a blocking and flow disturbing component, and the blocking and flow disturbing component is arranged on the other side wall at the top of the air supply vertical pipe. The blocking and flow disturbing component includes a side box and a blocking square frame. An installation hole is opened on the side surface of the air supply vertical pipe opposite to the cold air pipe. A side box is arranged outside the installation hole. A blocking square frame is horizontally and dampingly slidably installed in the side box, and a first driving rod is arranged at the outer end of the blocking square frame. In the no-wind mode, the blocking square frame blocks the second air guiding square pipe.

10. The energy-saving air flow disturbance air duct for a coal mill with a flow field optimization function according to claim 9, characterized in that: The blocking and flow disturbing component further includes a second flow equalizing plate. The second flow equalizing plate is attached to the bottom surface of the blocking square frame, and the second flow equalizing plate is horizontally and dampingly slidably installed in the side box. The back of the second flow equalizing plate is connected to a second driving rod.

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