Energy-saving air flow disturbance air pipe with flow field optimization function

Abstract

The application provides an energy-saving air flow disturbance air pipe of a coal mill with a flow field optimization function, relates to the technical field of coal mills, and comprises a blast vertical pipe, the top end of which inputs hot air and is provided with a first air flow measuring element, the bottom end of the blast vertical pipe is communicated with a first elbow pipe, an arc-shaped flow guide plate is arranged at an arc-shaped surface in the first elbow pipe, the outlet end of the first elbow pipe is communicated with a blast horizontal pipe, the outlet end of the blast horizontal pipe is provided with a backflow sealing pipe, and the top surface of the outlet end of the blast horizontal pipe is provided with an air outlet pipe; a first flow equalizing plate is arranged in the blast horizontal pipe and is provided with a second air flow measuring element on the air outlet side; a cold air pipe is vertically arranged on one side wall of the top end of the blast vertical pipe; a flow distribution module is attached and arranged in the cold air pipe and comprises a first air flow guide module, a second air flow guide module and a third air flow guide module which are attached and arranged from top to bottom; the flow distribution module can be adjusted to a specified mode, so that cold air can effectively rush into hot air flow, and cold and hot air mixing is more uniform.

Description

Technical Field

[0001] This invention relates to the field of coal mill technology, and specifically to an energy-saving airflow disturbance duct for coal mills with flow field optimization function. Background Technology

[0002] Power generation boilers typically employ pulverized coal combustion technology, requiring extremely fine coal particles (generally, over 80% of the particles have a diameter of less than 75 micrometers). A coal mill crushes and grinds raw coal into fine powder, significantly increasing the coal's surface area and allowing it to mix thoroughly with air for efficient combustion. To meet the oxygen supply requirements of the coal mill, hot air is supplied through ductwork.

[0003] like Figure 13 For example, a cross-sectional diagram of the existing coal mill duct. Figure 14 and 15 The temperature distribution diagram of the existing coal mill duct is shown. Temperature simulation results indicate that under the existing cold and hot primary air duct layout, it is difficult for cold air to penetrate hot air by relying solely on its own momentum. A long mixing section is required to fill the entire cross-section, resulting in an extremely uneven flow field distribution within the duct, with obvious high-temperature and low-temperature zones. It is urgent to optimize the cold air inlet of the coal mill duct to solve the problem of uneven temperature distribution in the coal mill duct. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an energy-saving airflow disturbance duct for coal mills with flow field optimization capabilities, thus solving the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A coal mill energy-saving airflow disturbance duct with flow field optimization function includes an air supply vertical pipe with hot air input at the top and a first wind measuring element installed thereon. The bottom end of the air supply vertical pipe is connected to a first bend pipe. An arc-shaped guide plate is provided at the upper arc surface inside the first bend pipe. The outlet end of the first bend pipe is connected to an air supply horizontal pipe. A return seal pipe is provided at the end of the outlet end of the air supply horizontal pipe. An air outlet pipe is provided on the top surface of the outlet end of the air supply horizontal pipe.

[0007] The first flow equalization plate is located inside the horizontal air supply pipe, and the second wind measuring element is installed on its air outlet side;

[0008] The cold air duct is vertically installed on the top side wall of the air supply duct. The cold air duct is used to input cold air to regulate the temperature of the hot air.

[0009] The air distribution module is fitted inside the air duct. The air distribution module includes a first air guide module, a second air guide module, and a third air guide module fitted from top to bottom. The first and third air guide modules are fixed inside the air duct and their air outlets are flush. The second air guide module includes a second air guide square tube, a flexible air guide square tube, an end air outlet component, a traction component, and a walking drive component. The walking drive component is installed at the inlet end inside the air duct. The second air guide square tube is slidably installed between the first and second air guide modules. The inner end of the second air guide square tube is connected to the end air outlet component through the flexible air guide square tube. The side wall of the second air guide square tube is provided with a traction component, and the traction end of the traction component is connected to the end air outlet component.

[0010] The second air guide tube slides and adjusts according to the hot air velocity to change the exhaust mode of the diversion module. When the first section of the second air guide tube moves inward, the first air guide module closes; when the second section moves inward, the second air guide module closes. The exhaust modes include no cold air mode, three-stage cold air mode, dual-stage cold air mode, and single-stage cold air mode. In the single-stage cold air mode, the end air outlet component is inclined downward and inserted into the air supply vertical pipe.

[0011] This invention provides an energy-saving airflow disturbance duct for coal mills with flow field optimization capabilities. Compared with existing technologies, it has the following advantages:

[0012] 1. Optimize the uniformity and mixing efficiency of hot air flow field: The present invention installs a first wind measuring element at the top of the air supply vertical pipe to accurately measure the inlet wind speed, and sets an arc-shaped guide plate on the arc surface inside the first bend to effectively stop and disturb the turning airflow, enhance the mixing effect when the hot air turns, and make the temperature distribution more uniform. At the same time, by setting a first flow equalization plate in the air supply horizontal pipe, the exhaust airflow is evenly dispersed, further stabilizing the airflow state. An innovative flow splitting module is proposed in the cold air duct, which has four modes: no cold air, three-channel cold air, two-channel cold air, and single-channel cold air. It realizes intelligent switching according to the hot air wind speed. When the hot air is low speed, the three channels of cold air are discharged three-dimensionally from the top, middle and bottom dimensions to expand the contact surface and fully mix. When the hot air is medium speed, the first guide module is closed to enhance the impact force of the cold air, overcome the impact force of the hot air, and improve the mixing efficiency. When the hot air is high speed, only the main air component is retained for exhaust, and the end air outlet component is inserted into the hot air duct and discharged cold air at an angle downward, cutting into the hot air in an oblique manner to simplify the mixing process.

[0013] 2. Improved efficiency and precision of hot and cold air mixing: This invention achieves optimized hot air diversion and mixing through the synergistic effect of the arc-shaped guide plate in the first bend and the flow equalization plate in the horizontal air supply pipe. Specifically, the flow distribution module in the cold air duct can precisely control the cold air input mode according to different hot air velocities. In the three-stage cold air mode, the cold air is discharged three-dimensionally. In the two-stage cold air mode, the first air guide module is closed to enhance the impact force. In the single-stage cold air mode, the end air outlet component extends into the air to reduce the discharge distance, so that the cold air is directly delivered to the core area of ​​the hot air, achieving efficient mixing of hot and cold air and significantly improving mixing efficiency and precision.

[0014] 3. Enhanced system energy efficiency and adaptability: This invention uses a wind-measuring element to monitor the hot air velocity in real time, combined with the intelligent control of the flow distribution module, to achieve on-demand distribution of cold air, avoiding energy waste caused by excessive cold air input. Specifically, when cold air is not needed, the sealing frame blocks the second air guide tube and the mounting hole to ensure normal hot air circulation and reduce hot air loss. The second flow equalization plate can be extended or retracted according to actual needs to further optimize the mixed airflow and improve the overall energy-saving effect, thereby ensuring that the coal mill can operate efficiently and stably under various operating conditions. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 A schematic diagram of the energy-saving airflow disturbance duct structure for a coal mill according to the present invention is shown;

[0017] Figure 2 A schematic diagram of the internal cross-sectional structure of the energy-saving airflow disturbance duct for coal mills according to the present invention is shown;

[0018] Figure 3 This diagram shows the connection structure between the air outlet of the diversion module and the cold air duct of the present invention;

[0019] Figure 4 A schematic diagram of the air inlet structure of the diversion module of the present invention is shown;

[0020] Figure 5 A schematic diagram of the traction component structure of the present invention is shown;

[0021] Figure 6 A schematic diagram of the structure of the first inlet sealing component of the present invention is shown;

[0022] Figure 7A schematic diagram of the structure of the second inlet sealing component of the present invention is shown;

[0023] Figure 8 A bottom view of the flow splitter module structure of the present invention is shown;

[0024] Figure 9 A schematic diagram of the drive component structure of the present invention is shown;

[0025] Figure 10 A schematic diagram of the dual-channel mode structure of the current splitter module of the present invention is shown;

[0026] Figure 11 A schematic diagram of the single-channel mode structure of the current splitter module of the present invention is shown;

[0027] Figure 12 A schematic diagram of the connection structure between the translational slide and the guide groove of the present invention is shown;

[0028] Figure 13 A schematic diagram of the cross-sectional structure of a coal mill duct in the background art of this invention is shown;

[0029] Figure 14 It shows Figure 13 A schematic diagram of the temperature distribution on the side section of the air duct;

[0030] Figure 15 It shows Figure 13 A schematic diagram of the temperature distribution in the top view of the air duct section;

[0031] Figure 16 A schematic diagram of the temperature distribution on the side cross section of the duct of the present invention is shown;

[0032] Figure 17 A schematic diagram of the temperature distribution of the duct cross-section from top view is shown.

[0033] The diagram shows: 1. Vertical air supply duct; 11. First air measuring element; 12. Mounting hole; 2. First bend; 21. Arc-shaped guide plate; 3. Horizontal air supply duct; 31. First flow equalization plate; 32. Second air measuring element; 33. Return seal pipe; 331. Second bend; 332. Baffle pipe; 4. Air outlet duct; 5. Cold air duct; 51. Horizontal sliding groove; 6. First air guide module; 61. First air guide square tube; 62. First outlet sealing plate; 63. First inlet sealing component; 631. Strip; 632. First plate; 633. Second plate; 6331. First start / stop motor; 7. Second air guide module; 71. Second air guide square tube; 711. First slider; 72. Walking drive. Components, 721, Fixing block, 722, Translation screw, 73, Traction component, 731, Back plate, 732, Rewinding wheel, 733, Traction rope, 74, Flexible air guide square tube, 75, Air outlet frame, 751, Second slider, 76, Guide groove, 761, Translation section, 762, Arc section, 763, Magnetic block, 8, Third air guide module, 81, Third air guide square tube, 82, Second outlet sealing plate, 83, Second inlet sealing component, 831, Third plate, 832, Fourth plate, 8321, Second start / stop motor, 9, Blocking and turbulence assemblies, 91, Side box, 92, Blocking frame, 93, First drive rod, 94, Second flow equalization plate, 95, Second drive rod. Detailed Implementation

[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 are described clearly and completely. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] As to understand the technical concept of this invention, the present invention proposes an optimization approach for the inlet airflow field of a coal mill. In specific implementation, the preferred dimensions are 1000×1200×4mm for the hot air duct and Φ630×4mm for the cold air duct. The existing distance between the air measuring element and the cold air mixing point is 2200mm.

[0036] like Figures 13-15 (A cloud map showing the distribution of the primary airflow field at the inlet of the existing coal mill) and Table 1 below.

[0037] Table 1: Uniformity of Flow Field at the Original Online Airflow Measurement Section under Existing Duct Layout Conditions

[0038]

[0039] Numerical simulation results show that, under the existing cold and hot air duct layout, it is difficult for cold air to penetrate hot air using only its own momentum. A long mixing section is required to fill the entire cross-section, resulting in an extremely uneven primary airflow field distribution at the online measurement cross-section. This manifests as distinct high-speed and low-speed zones, as well as distinct high-temperature and low-temperature zones. The relative standard deviation of the velocity distribution at the measurement element cross-section reaches 18.1%, and the relative standard deviation of the temperature distribution is 7.9%. Based on this, this invention proposes a coal mill inlet airflow field optimization technology to solve the problem of extremely uneven airflow field distribution at the coal mill inlet.

[0040] To address the technical problems in the background section, the following energy-saving airflow disturbance duct for coal mills with flow field optimization function is provided:

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

[0042] The first flow equalization plate 31 is disposed inside the air supply horizontal pipe 3, and the second wind measuring element 32 is installed on its air outlet side;

[0043] The cold air duct 5 is vertically installed on the top side wall of the air supply duct 1. The cold air duct 5 is used to input cold air to regulate the temperature of the hot air.

[0044] The air diversion module is fitted inside the air duct 5. The air diversion module includes a first air guide module 6, a second air guide module 7, and a third air guide module 8, which are fitted together from top to bottom. The first air guide module 6 and the third air guide module 8 are fixed inside the air duct 5 and their air outlet ends are flush. The second air guide module 7 includes a second air guide square tube 71, a flexible air guide square tube 74, an end air outlet component, a traction component 73, and a walking drive component 72. The walking drive component 72 is installed at the inlet end inside the air duct 5. The second air guide square tube 71 is slidably installed between the first air guide module 6 and the second air guide module 7. The inner end of the second air guide square tube 71 is connected to the end air outlet component through the flexible air guide square tube 74. The side wall of the second air guide square tube 71 is provided with a traction component 73, and the traction end of the traction component 73 is connected to the end air outlet component.

[0045] The second air guide square tube 71 is slidably adjusted according to the hot air velocity to change the exhaust mode of the diversion module. When the second air guide square tube 71 moves inward at one stage, the first air guide module 6 is closed, and when it moves inward at the second stage, the second air guide module 7 is closed. The exhaust modes include no cold air mode, three-stage cold air mode, two-stage cold air mode and single-stage cold air mode. In the single-stage cold air mode, the end air outlet component is inclined downward and inserted into the air supply vertical tube 1.

[0046] The specific exhaust mode is as follows:

[0047] In the no-cold-air mode: the air outlets 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 flush inside the cold air duct 5;

[0048] In the three-stage cold air mode: the hot air speed is low, and the air outlets of the first air guide module 6, the second air guide module 7, and the third air guide module 8 are all open; the air outlet component at the traction end of the traction component 73 is placed flush with the cold air duct 5.

[0049] In dual-channel cold air mode: during hot air speed, the second air guide square tube 71 moves inward once, the inlet end of the first air guide module 6 closes, the end air outlet component extends into the cold air duct 5, and the end air outlet component forms a flow barrier above the outlet end of the second air guide module 7.

[0050] In single-channel cold air mode: the hot air velocity is high, the second air guide square tube 71 moves inward twice, 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 is inserted into the hot air pipe and is tilted and adjusted during the insertion process until the air outlet is tilted downward.

[0051] In the above scheme:

[0052] 1. The inlet wind speed of the air supply vertical pipe 1 can be measured using the first wind measuring element 11 to provide parameters for the operation of the flow splitting module; an arc-shaped guide plate 21 is added at the first bend 2 to stop and turbulent the airflow at the first bend 2, enhance the turning and mixing effect, and make the temperature more uniform; a first flow equalization plate 31 is set at the air supply horizontal pipe 3 to disperse the airflow to be discharged, making the discharged airflow more uniform and stable; a second wind measuring element 32 is added on the air outlet side of the first flow equalization plate 31 to measure the outlet wind speed; the first wind measuring element 11 and the second wind measuring element 32 are exemplary SLFS-MF wind speed sensors;

[0053] 2. A distribution module is added inside the cooling duct 5. The distribution module has four working modes: no cooling mode, three-stage cooling mode, dual-stage cooling mode, and single-stage cooling mode. This will bring the following effects:

[0054] 2.1 When the hot air temperature meets the requirements, the first air guide module 6, the second air guide module 7, and the third air guide module 8 of the diversion module are in a closed state.

[0055] 2.2 When the hot air velocity is low, the impact force of the hot air is small. The first air guide module 6, the second air guide module 7 and the third air guide module 8 are all opened, and the cold air is discharged three-dimensionally from the top, middle and bottom. The contact surface between the cold air and the hot air is wider and the mixing is more thorough.

[0056] 2.3 When the hot air velocity is moderate, if the cold air is divided into three streams, the cold air force is insufficient and it is not easy to overcome the hot air force, resulting in poor mixing effect. At this time, the first air guide module 6, which is the first to be impacted, can be closed, and the walking drive component 72 can drive the second air guide square tube 71 to move inward. In this way, the airflow can be discharged through the third air guide module 8 and the second air guide square tube 71, increasing the airflow impact force and making it easier for the cold air to rush into the hot air for mixing.

[0057] When the second air guide tube 71 moves inward, it can push the end air outlet component to extend into the air supply vertical pipe 1. In this way, the end air outlet component can stop and turbulent the airflow, reduce the impact of hot air and facilitate mixing. Furthermore, the insertion of the end air outlet component can shorten the discharge distance, so the discharged cold air can be directly sent into the air supply vertical pipe 1, making it easier for cold air and hot air to mix. The extended end air outlet component can also form a stop barrier above the third air guide module 8. In this way, the impact at the outlet of the third air guide module 8 is smaller, and the cold air discharged from the third air guide module 8 is easier to mix with the hot air.

[0058] 2.4 When the hot air velocity is high, the force of the two streams of cold air is insufficient. At this time, the third air guide module 8 can be closed, so that the cold air is only discharged under pressure through the second air guide square tube 71, so that the cold air can be mixed with the hot air; the walking drive component 72 drives the second air guide square tube 71 to move inward in two sections, and closes the second air guide module 7. In this way, the airflow can be discharged through the second air guide square tube 71 only.

[0059] When the second air guide square tube 71 moves inward in the second section, the traction component 73 will unlock, causing the end air outlet component to adjust to a downward tilted position within the air supply vertical tube 1, and increasing the insertion depth. The flexible air guide square tube 74 will deform accordingly. Thus, the cold air discharged from the end air outlet component is discharged downward at an angle, allowing the cold air to cut obliquely into the hot air, making mixing easier. Figure 16 and Figure 17 As shown, the duct temperature is significantly more uniform after being regulated by the flow distribution module.

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

[0061] In this embodiment, the first air guide module 6 includes a first air guide square tube 61, a first outlet sealing plate 62, and a first inlet sealing component 63. The air outlet of the first air guide square tube 61 is conical, and the top of the first outlet sealing plate 62 is rotatably installed on the inner top surface of the air outlet end of the first air guide square tube 61. The first inlet sealing component 63 is installed at the air inlet end of the first air guide square tube 61. When the first inlet sealing component 63 seals the first air guide module 6, it forms an oblique guiding structure, allowing the airflow to enter the second air guide square tube 71 and the third air guide module 8.

[0062] In the above scheme: cold air is output through the first air guide square tube 61. When there is airflow, the first outlet sealing plate 62 is blown upward and opened. When there is no airflow, the first outlet sealing plate 62 falls and closes under the action of gravity, preventing the hot air from the air supply vertical pipe 1 from flowing back into the first air guide square tube 61. The outlet of the first air guide square tube 61 is designed to be conical, which can increase the exhaust pressure. The first inlet sealing component 63 can seal the inlet end of the first air guide square tube 61.

[0063] If the first inlet blocking component 63 directly and flatly blocks the first air guide square tube 61, it will obstruct and turbulent the incoming cold air, affecting the smoothness of the cold air output. To solve the above problem, the following solution is given: The first inlet blocking component 63 includes a strip 631, a first plate 632 and a second plate 633. One end of the second plate 633 is rotatably connected to the top of the air inlet of the first air guide square tube 61 and is rotatably connected to the first start-stop motor 6331. The other end of the second plate 633 is rotatably connected to the first plate 632. The outer end of the first plate 632 is rotatably connected to the strip 631. The strip 631 is slidably installed on the inner top surface of the cold air duct 5. When the second plate 633 rotates downward to block the air inlet of the first air guide square tube 61, the first plate 632 rotates downward to an inclined state to guide the airflow into the second air guide square tube 71.

[0064] In the above scheme: the first start-stop motor 6331 drives the second plate 633 to rotate downwards, the second plate 633 pulls the first plate 632 to rotate downwards, and the strip 631 moves horizontally along the top surface inside the cold air duct 5. Finally, the second plate 633 blocks the second air guide square tube 71, and the first plate 632 is adjusted to an inclined state. In this way, the first plate 632 can guide the cold air into the second air guide square tube 71. Both ends of the second plate 633 are damped rotations, and the first plate 632 and the strip 631 are damped rotations, so that the first plate 632 and the second plate 633 can be fixed at the corresponding rotation angles. The strip 631 is damped sliding and can be kept in the corresponding moving position.

[0065] In this embodiment, the third air guiding module 8 includes a third air guiding square tube 81, a second outlet sealing plate 82, and a second inlet sealing component 83. The air outlet of the third air guiding square tube 81 is conical. The top of the second outlet sealing plate 82 is rotatably installed on the top surface inside the air outlet of the first air guiding square tube 61. The air inlet end of the third air guiding square tube 81 is equipped with a second inlet sealing component 83. The second inlet sealing component 83 and the first inlet sealing component 63 have the same structure. When the second inlet sealing component 83 seals the third air guiding module 8, it forms an oblique guiding structure, so that the airflow only enters the second air guiding square tube 71.

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

[0067] In this embodiment, the second air guide square tube 71 has a first slider 711 on each of its two side walls. The first slider 711 is horizontally slidably embedded in the translational groove 51 inside the cold air duct 5. The traction component 73 includes a back plate 731, a winding wheel 732, and a traction rope 733. The back plate 731 is located at the air outlet end of the side wall of the second air guide square tube 71. The outer wall of the back plate 731 is provided with a winding wheel 732, and the outer wall of the winding wheel 732 is wound with the traction rope 733. The traction component 73 is placed entirely in the translational groove 51, and the end of the traction rope 733 is connected to the end air outlet component. The winding wheel 732 can be used to control the winding and unwinding of the traction rope 733, thereby simultaneously controlling the winding and unwinding of the air outlet frame 75 and the flexible air guide hose, making the closing and moving of the three-section second air guide module 7 and its dispersed operation more stable and smooth.

[0068] In this embodiment, the length of the first air guide tube is greater than the length of the third air guide tube, and when the second air guide tube is in its initial position, the air inlet end of the second air guide tube is located outside the air inlet end of the first air guide tube.

[0069] In this embodiment, the walking drive component 72 includes a translation screw 722 and a fixing block 721. The fixing block 721 is fixed to the inner wall of the inlet end of the cold air duct 5. One end of the translation screw 722 is rotatably disposed within the fixing block 721, and the other threaded end of the translation screw 722 extends into the second air guide square tube 71. The translation screw 722 can drive the second air guide square tube 71 to move. A motor for driving the translation screw 722 to rotate is provided on the outside of the fixing block 721.

[0070] To enable the end air outlet component to extend into the air supply vertical pipe 1 and to change the airflow direction, the following solution is proposed:

[0071] The end air outlet component includes an air outlet frame 75 and a guide groove 76. The air outlet frame 75 has second sliders 751 on both sides. The end of the traction rope 733 is connected to the second sliders 751. The guide groove 76 is symmetrically opened 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 connected with the translation slide 51 of the cold air pipe 5. The outlet of the translation section 761 is provided with a downwardly extending arc section 762. When the second air guide square pipe 71 moves inward once, the air outlet frame 75 moves to the translation section 761. When the second air guide square pipe 71 moves inward a second time, the air outlet frame 75 moves along the arc section 762 under its own weight. The slider and the magnetic block 763 at the inner end of the arc section 762 are magnetically attracted and positioned.

[0072] In the above scheme: when the end air outlet component is subjected to force, the second slider 751 of the air outlet frame 75 moves along the translation groove 51 to the translation section 761 first, and then moves to the arc section 762. Using the supporting and guiding force of the arc section 762, the gravity of the air outlet frame 75 and the thrust on the air outlet frame 75, the air outlet frame 75 moves downward along the arc section 762 to adjust to a tilted downward state and penetrates deeper into the air supply vertical pipe 1; the end of the arc section 762 is provided with a magnetic block 763, which can attract and position the second slider 751.

[0073] Since the air outlet frame 75 has a flat structure and limited installation space, it is not possible to set the same structure as the first outlet blocking plate 62. To solve the problem of blocking the second air guide square tube 71, the following solution is given: The diversion module also includes a blocking and turbulence component 9, which is located on the other side wall of the top of the air supply vertical pipe 1. The blocking and turbulence component 9 includes a side box 91 and a blocking frame 92. The side of the air supply vertical pipe 1 opposite to the cold air pipe 5 has an installation hole 12. The side box 91 is located outside the installation hole 12. The blocking frame 92 is horizontally damped and slidably installed inside the side box 91. The outer end of the blocking frame 92 is provided with a first drive rod 93. In the windless mode, the blocking frame 92 blocks the second air guide square tube 71.

[0074] In the above scheme: when no cold air is required, the drive rod drives the sealing frame 92 to move into the air supply vertical pipe 1. One end of the sealing frame 92 blocks the second air guide square pipe 71, and the other end blocks the mounting hole 12, while hot air can circulate normally.

[0075] To make the mixed exhaust airflow more uniform and the mixing effect better, in this embodiment, the blocking and turbulence component 9 also includes a second flow equalization plate 94. The second flow equalization plate 94 is attached to the bottom surface of the blocking frame 92, and the second flow equalization plate 94 is horizontally damped and slidably installed in the side box 91. The back of the second flow equalization plate 94 is connected to the second drive rod 95.

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

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

[0078] In the no-cold-air mode: the first air guide square tube 61, the air outlet frame 75, and the third air guide square tube 81 are all housed in the cold air duct 5, and the inner ends of each air guide square tube are flush with the inner ends of the cold air duct 5; the first outlet sealing plate 62 and the second outlet sealing plate 82 block the airflow, and the first drive rod 93 drives the sealing square frame 92 to block the air outlet frame 75;

[0079] The air supply duct 1 normally delivers hot air. The hot air is turbulent in the arc-shaped guide plate 21, then passes through the first flow equalization plate 31 and is output to the air outlet duct 4.

[0080] In the three-stage cooling mode: the hot air velocity (15-20m / s) is low;

[0081] The sealing frame 92 is reset and retracted. The external fan delivers cold air into the cold air duct 5, and then it is diverted into the first air guide square duct 61, the second air guide square duct 71 and the third air guide square duct 81. The first outlet sealing plate 62 and the second outlet sealing plate 82 at the outlet ends of the first air guide square duct 61 and the third air guide square duct 81 are lifted by the airflow.

[0082] The airflow enters the input hot air and mixes with the hot air before being output, thus changing the temperature of the hot air.

[0083] In dual-channel cooling mode: hot air velocity (20-27 m / s) is medium;

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

[0085] After the air outlet frame 75 extends into place, the air inlet end of the second air guide square tube is flush with the air inlet end of the first air guide square tube. The first start-stop motor 6331 drives the second plate 633 to rotate downward, which in turn drives the first plate 632 to rotate downward. The strip 631 slides along the top surface inside the cold air duct 5. Finally, the second plate 633 blocks the inlet of the first air guide square tube 61, and the first plate 632 forms a downward flow guiding structure.

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

[0087] The translation screw 722 rotates, driving the second air guide square tube 71 to move inward twice. 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, causing the air outlet frame 75 to gradually adjust to tilt downward and rotate, and lengthen the flexible air guide square tube 74. Finally, the magnetic block 763 attracts the second slider 751.

[0088] After the air outlet frame 75 extends into place, the air inlet end of the second air guide square tube is flush with the air inlet end of the third air guide square tube. The second start-stop motor 8321 drives the fourth plate 832 to rotate upward, which in turn drives the third plate 831 to rotate upward. Finally, the fourth plate 832 blocks the inlet of the third air guide square tube 81, and the third plate 831 forms an upward guiding structure.

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

[0090] Table 2: Uniformity index of flow field at the optimized online air volume measurement section

[0091]

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

[0093] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An energy-saving airflow disturbance duct for coal mills with flow field optimization function, characterized in that, include: The air supply vertical pipe has hot air input at its top and a first wind measuring element installed thereon. The bottom end of the air supply vertical pipe is connected to the first bend pipe. An arc-shaped guide plate is provided at the upper arc surface inside the first bend pipe. The outlet end of the first bend pipe is connected to the air supply horizontal pipe. A return seal pipe is provided at the end of the outlet end of the air supply horizontal pipe. An air outlet pipe is provided on the top surface of the outlet end of the air supply horizontal pipe. The first flow equalization plate is located inside the horizontal air supply pipe, and the second wind measuring element is installed on its air outlet side; The cold air duct is vertically installed on the top side wall of the air supply duct. The cold air duct is used to input cold air to regulate the temperature of the hot air. The air distribution module is fitted inside the air duct. The air distribution module includes a first air guide module, a second air guide module, and a third air guide module fitted from top to bottom. The first and third air guide modules are fixed inside the air duct and their air outlets are flush. The second air guide module includes a second air guide square tube, a flexible air guide square tube, an end air outlet component, a traction component, and a walking drive component. The walking drive component is installed at the inlet end inside the air duct. The second air guide square tube is slidably installed between the first and second air guide modules. The inner end of the second air guide square tube is connected to the end air outlet component through the flexible air guide square tube. The side wall of the second air guide square tube is provided with a traction component, and the traction end of the traction component is connected to the end air outlet component. The second air guide tube slides and adjusts according to the hot air velocity to change the exhaust mode of the diversion module. When the first section of the second air guide tube moves inward, the first air guide module closes; when the second section moves inward, the second air guide module closes. The exhaust modes include no cold air mode, three-stage cold air mode, two-stage cold air mode, and single-stage cold air mode. In the single-stage cold air mode, the end air outlet component is inclined downward and inserted into the air supply vertical pipe. The first air guiding module includes a first air guiding square tube, a first outlet sealing plate, and a first inlet sealing component. The air outlet of the first air guiding square tube is conical, and the top of the first outlet sealing plate is rotatably installed on the inner top surface of the air outlet end of the first air guiding square tube. The air inlet end of the first air guiding square tube is equipped with a first inlet sealing component. When the first inlet sealing component seals the first air guiding module, it forms an oblique flow guiding structure, allowing the airflow to enter the second air guiding square tube and the third air guiding module. The first inlet sealing component includes a strip, a first plate, and a second plate. One end of the second plate is rotatably connected to the top of the air inlet of the first air guide square tube and is rotatably connected to a first start-stop motor. The other end of the second plate is rotatably connected to the first plate. The outer end of the first plate is rotatably connected to the strip, which is slidably installed on the inner top surface of the cold air duct. When the second plate rotates downward to seal the air inlet of the first air guide square tube, the first plate rotates downward to an inclined state to guide the airflow into the second air guide square tube. The third air guiding module includes a third air guiding square tube, a second outlet sealing plate, and a second inlet sealing component. The outlet of the third air guiding square tube is conical. The top of the second outlet sealing plate is rotatably installed on the top surface inside the outlet end of the first air guiding square tube. A second inlet sealing component is installed at the inlet end of the third air guiding square tube. The second inlet sealing component has the same structure as the first inlet sealing component. When the second inlet sealing component seals the third air guiding module, it forms an oblique guiding structure, so that the airflow only enters the second air guiding square tube.

2. The energy-saving airflow disturbance duct for coal mills with flow field optimization function as described in claim 1, characterized in that: The specific exhaust mode is as follows: In the no-cold-air mode: the air outlets of the first air guide module, the second air guide module, and the third air guide module are all closed; the traction component is retracted, and the end air outlet component is placed flush inside the cold air duct; In the three-stage cooling mode: the hot air speed is low, and the air outlets of the first, second, and third air guide modules are all open; the air outlet of the traction component is placed flush with the air outlet inside the cooling duct. In dual-channel cold air mode: During hot air speed, the second air guide square tube moves inward once, the inlet end of the first air guide module closes, the end air outlet component extends into the cold air duct, and the end air outlet component forms a flow obstruction barrier above the outlet end of the second air guide module. In single-channel cold air mode: the hot air velocity is high, the second air guide square tube moves inward for the second time, the inlet end of the second air guide module is closed, the traction component is released and unlocked, the end air outlet component is inserted into the hot air pipe and is tilted and adjusted during the insertion process until the air outlet is tilted downward.

3. The energy-saving airflow disturbance duct for coal mills with flow field optimization function as described in claim 1, characterized in that: The second air guide square tube has a first slider on each of its two side walls. The first slider is horizontally slidably embedded in the translation groove inside the cold air duct. The traction component includes a back plate, a winding wheel and a traction rope. The back plate is located at the air outlet end of the side wall of the second air guide square tube. The outer wall of the back plate is provided with a winding wheel. The outer wall of the winding wheel is wound with a traction rope. The entire traction component is placed in the translation groove. The end of the traction rope is connected to the end air outlet component.

4. The energy-saving airflow disturbance duct for coal mills with flow field optimization function as described in claim 1, characterized in that: The walking drive component includes a translation screw and a fixing block. The fixing block is fixed to the inner wall of the inlet end of the cold air duct. One end of the translation screw is rotatably disposed in the fixing block, and the other end of the translation screw thread extends into the second air guide square tube.

5. The energy-saving airflow disturbance duct for coal mills with flow field optimization function as described in claim 1, characterized in that: The end air outlet component includes an air outlet frame and a guide groove. The air outlet frame has second sliders on both sides. The end of the traction rope is connected to the second slider. The guide groove is symmetrically opened on the inner wall of the air supply vertical pipe. The guide groove includes a translation section and an arc section. The inlet of the translation section is aligned and connected with the translation groove of the cold air pipe. The outlet of the translation section has a downwardly extending arc section. When the second air guide square pipe moves inward once, the air outlet frame moves to the translation section. When the second air guide square pipe moves inward a second time, the air outlet frame moves along the arc section under its own weight. The slider is magnetically positioned by magnetic attraction with the magnetic block at the inner end of the arc section.

6. The energy-saving airflow disturbance duct for coal mills with flow field optimization function as described in claim 1, characterized in that: The diversion module also includes a blocking and turbulence-disrupting component, which is located on the other side wall of the top of the air supply vertical duct. The blocking and turbulence-disrupting component includes a side box and a blocking frame. The side of the air supply vertical duct opposite to the cold air duct has an installation hole. The side box is located outside the installation hole. The blocking frame is horizontally damped and slidably installed inside the side box. The outer end of the blocking frame is provided with a first drive rod. In the windless mode, the blocking frame blocks the second air guide duct.

7. The energy-saving airflow disturbance duct for coal mills with flow field optimization function as described in claim 6, characterized in that: The blocking and turbulence assembly also includes a second flow equalization plate, which is fitted to the bottom surface of the blocking frame. The second flow equalization plate is horizontally damped and slidably installed in the side box, and the back of the second flow equalization plate is connected to a second drive rod.

Images