Coal mill outlet temperature deviation optimization control device

Abstract

The invention discloses a coal mill outlet temperature deviation optimization control device, belongs to the technical field of coal mills, and aims to solve the problem that pulverized coal is prone to spontaneous combustion after adjustment of existing coal mill outlet temperature adjusting equipment. The flashboards of the two air brakes are controlled to rotate reversely through the motor and the transmission part, opposite adjustment of the cold air amount and the primary air amount is achieved, working condition changes can be accurately dealt with, the motor drives the transmission rod to rotate, the sealing plate is pushed to move, the heat dissipation area of the sealing plate to the spiral flow guide plate is adjusted, and the heat dissipation area is related to the cold air amount; when the cold air amount is increased, the sealing plate moves in the direction of increasing the heat dissipation area, when the temperature of an outlet of the coal mill is increased, cold air firstly dissipates heat of the coal pipe to prevent pulverized coal in the coal pipe from burning, then the cold air and primary air are mixed to enter the coal mill, and the situation that the temperature in the coal mill is greatly reduced to affect the pulverized coal drying effect can be avoided; the problems that pulverized coal is not dried completely and the gathering temperature of the pulverized coal in the coal pipe is too high are effectively solved, and safety is improved.

Description

Technical Field

[0001] The invention relates to the technical field of coal mills, and in particular to a coal mill outlet temperature deviation optimization control device. Background Art

[0002] Coal is often used as fuel in thermal power generation. Coal powder is a combustible substance. When the outlet temperature of the pulverizer is too high, the ambient temperature of the coal powder will also increase. Coal powder has a high specific surface area and a large contact area with the air. Its ignition point will decrease with the increase of temperature and oxygen concentration. The appropriate outlet temperature can ensure that the coal powder is well dried. If the temperature is too low, the moisture content in the coal powder will be too high and the wet coal powder will easily clump.

[0003] During the grinding process inside the coal mill, the coal absorbs heat, evaporates and is dried. After entering the coal pipe, it is very easy to spontaneously combust or even explode due to its dry state and high temperature. The existing means is to control the internal temperature by changing the ratio and air volume of the cold air and primary air entering the coal mill. However, the outlet temperature of the coal mill is affected by many factors such as the primary air temperature, the particle size of the coal, the water content of the coal and the type of coal. The primary air temperature is also unstable, and its adjustment has lag and uncertainty. Although this reduces the outlet temperature of the coal mill, it is easy for the coal powder to not be completely dried and to clump and accumulate at the outlet of the coal mill. The agglomerated coal powder is still prone to spontaneous combustion under continuous high temperature and oxidation. Summary of the invention

[0004] The purpose of the present invention is to provide a coal mill outlet temperature deviation optimization control device, which solves the problem that the existing coal mill outlet temperature adjustment equipment in the background technology is prone to cause coal powder to spontaneously combust after adjustment.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: a coal mill outlet temperature deviation optimization control device, comprising an air inlet pipe connected to the coal mill air inlet and a coal pipe connected to the coal mill outlet, specifically, the air inlet pipe and the left ends of the coal pipe are respectively connected to the air inlet and outlet of the coal mill, the air inlet pipe is connected to a cold air pipe and a primary air pipe at one end away from the air inlet of the coal mill, a flexible butt pipe is installed on the top of the cold air pipe, and air dampers are installed on the cold air pipe and the primary air pipe, and the two groups of air dampers are respectively used to control the cold air volume and the primary air volume, a spiral guide plate is installed on the outside of the coal pipe, and an air duct adjustment component with a telescopically adjustable horizontal length is also installed on the outside of the coal pipe, the lower part of the inside of the air duct adjustment component is connected to the flexible butt pipe, and a driving mechanism is arranged on the outside of the air duct adjustment component, and the driving mechanism is used to adjust the telescopic length of the air duct adjustment component and control the air volume of the two groups of air dampers, and temperature sensors are installed on the coal pipe, the air inlet pipe, the cold air pipe and the primary air pipe; The air duct adjustment component includes a sealing ring, a first movable ring, a second movable ring, a third movable ring and a sealing plate which are sequentially arranged on the outside of the coal pipe, wherein one end of the sealing ring is closed and wraps the spiral guide plate inside, a cold air inlet pipe is installed on the sealing ring near the outlet end of the coal mill, the sealing ring, the first movable ring, the second movable ring and the third movable ring are slidingly connected in sequence, the sealing plate is threadedly connected to the spiral guide plate, and the sealing plate and the third movable ring are rotationally connected through the first rotating ring, as shown in the figure, a cold air collecting plate is arranged at the bottom of the third movable ring, and the cold air collecting plate is connected to the third movable ring and the flexible docking pipe; the cold air enters from the cold air inlet pipe and flows around under the guidance of the spiral guide plate, and is mixed with the primary air entering from the cold air collecting plate, the flexible docking pipe and the cold air pipe, and finally enters the coal mill through the air inlet pipe, and before entering, the cold air dissipates heat to the coal pipe according to the lengths of the sealing ring, the first movable ring, the second movable ring and the third movable ring to reduce the temperature inside the coal pipe.

[0006] Furthermore, the sealing ring, the first movable ring and the second movable ring are provided with sliding grooves on the outside, the first movable ring, the second movable ring and the third movable ring are provided with sliders corresponding to the sliding grooves on the inside, and a reset spring is fixedly installed between the sealing ring and the sealing plate; the length of the sealing plate is greater than the length of the sealing ring, the first movable ring and the second movable ring, so that the cold air collecting plate will not be blocked after the second movable ring is contracted; the outside of the spiral guide plate is stepped, and the outside of the spiral guide plate fits with the sealing ring, the first movable ring, the second movable ring and the third movable ring after they are unfolded.

[0007] Furthermore, the wind damper includes an outer shell and a damper plate movably arranged inside the outer shell, the damper plates are arranged in multiple groups, the outer shell is radially distributed with multiple groups of rotating shafts, the rotating shafts extend to the inside of the outer shell and are fixedly connected to the damper plates, and the rotating shafts are rotatably connected to the outer shell, the outer shell is rotatably connected with a linkage ring, the linkage ring is movably connected to the rotating shaft through a connecting rod, and a manual pull rod is also fixedly connected to the linkage ring; when the air volume needs to be adjusted, one group of rotating shafts is controlled to rotate, the rotating shaft drives the linkage ring to rotate through the connecting rod, the linkage ring drives other rotating shafts to rotate through other connecting rods, and finally drives the damper plate inside the outer shell to rotate to adjust the opening size.

[0008] Furthermore, the outside of the coal pipe is fixedly connected with a fixing plate and a mounting shell, the driving mechanism includes a motor fixedly arranged on the outside of the mounting shell, the output end of the motor is fixedly connected with a driving rod, and the driving rod extends to the inside of the mounting shell; a reduction box is arranged at the bottom of the mounting shell, the middle part of the driving rod is connected to the reduction box through a second gear set and a shaft, and a first rotating rod is connected below the reduction box.

[0009] Furthermore, the other end of the first rotating rod is connected to one of the groups of rotating shafts inside the wind gate on the primary air duct, and a second rotating rod is connected to one of the groups of rotating shafts inside the wind gate on the cold air duct. A first gear set is installed between the second rotating rod and the first rotating rod. When the motor rotates, the first rotating rod is driven to rotate through the driving rod, the second gear set and the reduction gear box, and the second rotating rod is driven through the first gear set. When the first rotating rod and the second rotating rod rotate, the air volume of the wind gate is adjusted, and when the air volume of the cold air duct increases, the air volume of the primary air duct decreases, and when the air volume of the cold air duct decreases, the air volume of the primary air duct increases.

[0010] Furthermore, the driving mechanism also includes a transmission rod rotatably connected between the spiral guide plate and the mounting shell, and a threaded rod fixedly connected between the spiral guide plate and the mounting shell, wherein the transmission rod and the driving rod are transmission-connected via a third gear set, a shaft and a fourth gear set; the transmission rod surface is evenly distributed with tooth grooves, the transmission rod is meshingly connected with the sealing plate, a spur gear is threadedly connected on the threaded rod, the spur gear is meshingly connected with the transmission rod, the side surface of the spur gear is rotationally connected with a third rotating ring, the outer side of the sealing plate is rotationally connected with a second rotating ring, and the second rotating ring is rotationally connected with the third rotating ring A connecting frame is connected in between; when the motor drives the driving rod to rotate, the transmission rod is driven to rotate through the third gear set, the shaft and the fourth gear set. When the transmission rod rotates, it drives the sealing plate and the spur gear to rotate. When the spur gear rotates, it moves on the threaded rod, and then the sealing plate is pushed to move through the connecting frame and the second rotating ring to reduce the friction between the sealing plate and the spiral guide plate. After the sealing plate moves, the heat dissipation area of ​​the spiral guide plate is adjusted, and when the air volume inside the cold air duct increases, the sealing plate moves to the right, and the heat dissipation area increases. When the air volume in the cold air duct decreases, the sealing plate moves to the left, and the heat dissipation area decreases.

[0011] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a coal mill outlet temperature deviation optimization control device, which realizes linkage control of the air gates on the cold air duct and the primary air duct through a motor and a transmission component, so that the gate plates of the two air gates rotate in opposite directions, thereby achieving opposite adjustment of the cold air volume and the primary air volume, and can accurately respond to changes in working conditions. The motor drives the transmission rod to rotate, pushes the sealing plate to move, and adjusts its heat dissipation area for the spiral guide plate, and the heat dissipation area is related to the cold air volume. When the cold air volume increases, the sealing plate moves in the direction of increasing the heat dissipation area. When the temperature at the coal mill outlet rises, the cold air first dissipates heat to the coal pipe to prevent the coal powder in the coal pipe from burning. Then the cold air is mixed with the primary air and enters the coal mill. Before the cold air enters, the temperature of the coal pipe is slightly increased due to the heat dissipation of the cold air, which can avoid a sharp drop in the internal temperature of the coal mill that affects the drying effect of the coal powder, effectively alleviates the problems of incomplete drying of the coal powder and excessively high temperature of the coal powder accumulated in the coal pipe, and improves safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the structure of the air inlet pipe, the air damper and the coal pipe of the present invention; Figure 3 It is a schematic diagram of the wind gate structure of the present invention; Figure 4 It is a detailed structural schematic diagram of the wind gate of the present invention; Figure 5 This is a structural exploded view of the coal pipe, air duct adjustment assembly and driving mechanism of the present invention; Figure 6 It is a schematic diagram of the structure of the air duct adjustment component of the present invention; Figure 7 It is a cross-sectional view of the structure of the air duct adjustment component of the present invention; Figure 8 It is a schematic diagram of the sealing plate and driving mechanism structure of the present invention.

[0013] In the figure: 1, air inlet pipe; 11, cold air pipe; 12, primary air pipe; 13, flexible butt pipe; 2, air damper; 21, housing; 22, damper; 23, linkage ring; 231, manual pull rod; 24, rotating shaft; 25, connecting rod; 26, first rotating rod; 27, second rotating rod; 28, first gear set; 3, coal pipe; 31, spiral guide plate; 32, fixing plate; 33, mounting shell; 34, reduction box; 4, air duct adjustment assembly; 41, sealing ring; 42, first Movable ring; 43. Second movable ring; 44. Third movable ring; 45. Sealing plate; 451. First rotating ring; 452. Second rotating ring; 46. Cold air inlet pipe; 47. Cold air collecting plate; 48. Return spring; 5. Driving mechanism; 51. Motor; 511. Driving rod; 52. Second gear set; 53. Third gear set; 54. Fourth gear set; 55. Transmission rod; 56. Threaded rod; 57. Spur gear; 58. Third rotating ring; 581. Connecting frame. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0015] In order to solve the technical problem that the existing coal mill outlet temperature adjustment equipment is easy to cause coal powder to spontaneously combust after adjustment, such as Figure 1-Figure 8 As shown, the following preferred technical solutions are provided: like Figure 1-Figure 2As shown, a device for optimizing and controlling the outlet temperature deviation of a coal mill comprises an air inlet pipe 1 connected to the air inlet of the coal mill and a coal pipe 3 connected to the outlet of the coal mill. Specifically, the left ends of the air inlet pipe 1 and the coal pipe 3 are respectively connected to the air inlet and the outlet of the coal mill. The end of the air inlet pipe 1 away from the air inlet of the coal mill is connected to a cold air pipe 11 and a primary air pipe 12. A flexible butt pipe 13 is installed on the top of the cold air pipe 11. Wind dampers 2 are installed on both the cold air pipe 11 and the primary air pipe 12. The two sets of wind dampers 2 are respectively used to control The cold air volume and the primary air volume, a spiral guide plate 31 is installed on the outside of the coal pipe 3, and a duct adjustment component 4 with a telescopically adjustable horizontal length is also installed on the outside of the coal pipe 3. The lower part of the inside of the duct adjustment component 4 is connected with the flexible butt pipe 13. A driving mechanism 5 is arranged on the outside of the duct adjustment component 4. The driving mechanism 5 is used to adjust the telescopic length of the duct adjustment component 4 and control the air volume of the two groups of air dampers 2. Temperature sensors are installed on the coal pipe 3, the air inlet pipe 1, the cold air pipe 11 and the primary air pipe 12; like Figure 5-Figure 6 As shown, the air duct adjustment component 4 includes a sealing ring 41, a first movable ring 42, a second movable ring 43, a third movable ring 44 and a sealing plate 45 which are sequentially arranged outside the coal pipe 3, wherein one end of the sealing ring 41 is closed and wraps the spiral guide plate 31 inside, and a cold air inlet pipe 46 is installed on the sealing ring 41 near the outlet end of the coal mill, and the sealing ring 41, the first movable ring 42, the second movable ring 43 and the third movable ring 44 are sequentially slidably connected, the sealing plate 45 is threadedly connected to the spiral guide plate 31, and the sealing plate 45 is rotatably connected to the third movable ring 44 through a first rotating ring 451, as shown in FIG. Figure 7 As shown, a cold air collecting plate 47 is provided at the bottom of the third movable ring 44, and the cold air collecting plate 47 is connected with the third movable ring 44 and the flexible docking tube 13; the cold air enters from the cold air inlet pipe 46 and flows around under the guidance of the spiral guide plate 31, and is mixed with the primary air entering from the cold air collecting plate 47, the flexible docking tube 13 and the cold air pipe 11 and the primary air entering from the primary air pipe 12, and finally enters the coal mill through the air inlet pipe 1. Before entering, the cold air dissipates heat to the coal pipe 3 according to the length of the sealing ring 41, the first movable ring 42, the second movable ring 43 and the third movable ring 44 to reduce the temperature inside the coal pipe 3.

[0016] like Figure 6 and Figure 7As shown, the sealing ring 41, the first movable ring 42 and the second movable ring 43 are provided with sliding grooves on the outside, the first movable ring 42, the second movable ring 43 and the third movable ring 44 are provided with sliders corresponding to the sliding grooves on the inside, and a return spring 48 is fixedly installed between the sealing ring 41 and the sealing plate 45; the length of the sealing plate 45 is greater than that of the sealing ring 41, the first movable ring 42 and the second movable ring 43, so that the cold air collecting plate 47 will not be blocked by the contraction of the second movable ring 43; the outside of the spiral guide plate 31 is stepped, and the outside of the spiral guide plate 31 fits with the sealing ring 41, the first movable ring 42, the second movable ring 43 and the third movable ring 44 after they are unfolded.

[0017] like Figure 3-Figure 4 As shown, the wind damper 2 includes a shell 21 and a gate plate 22 movably arranged inside the shell 21, and the gate plates 22 are provided with multiple groups. The shell 21 has multiple groups of rotating shafts 24 distributed radially. The rotating shafts 24 extend to the inside of the shell 21 and are fixedly connected to the gate plates 22, and the rotating shafts 24 are rotatably connected to the shell 21. The outer part of the shell 21 is rotatably connected with a linkage ring 23, and the linkage ring 23 is movably connected to the rotating shaft 24 through a connecting rod 25. A manual pull rod 231 is also fixedly connected to the linkage ring 23. When the air volume needs to be adjusted, one group of the rotating shafts 24 is controlled to rotate, and the rotating shaft 24 drives the linkage ring 23 to rotate through the connecting rod 25. The linkage ring 23 drives other rotating shafts 24 to rotate through other connecting rods 25, and finally drives the gate plate 22 inside the shell 21 to rotate to adjust the opening size.

[0018] like Figure 5 and Figure 8 As shown, the outside of the coal pipe 3 is fixedly connected with a fixing plate 32 and a mounting shell 33, and the driving mechanism 5 includes a motor 51 fixedly arranged on the outside of the mounting shell 33, and the output end of the motor 51 is fixedly connected with a driving rod 511, and the driving rod 511 extends to the inside of the mounting shell 33; a reduction box 34 is arranged at the bottom of the mounting shell 33, and the middle part of the driving rod 511 is connected to the reduction box 34 through a second gear set 52 and a shaft, and the first rotating rod 26 is connected below the reduction box 34.

[0019] like Figure 3 As shown, the other end of the first rotating rod 26 is connected to one of the groups of rotating shafts 24 inside the wind gate 2 on the primary air duct 12, and a second rotating rod 27 is connected to one of the groups of rotating shafts 24 inside the wind gate 2 on the cold air duct 11. A first gear set 28 is installed between the second rotating rod 27 and the first rotating rod 26. When the motor 51 rotates, the first rotating rod 26 is driven to rotate through the driving rod 511, the second gear set 52 and the reduction box 34, and the second rotating rod 27 is driven through the first gear set 28. When the first rotating rod 26 and the second rotating rod 27 rotate, the air volume of the wind gate 2 is adjusted, and when the air volume of the cold air duct 11 increases, the air volume of the primary air duct 12 decreases, and when the air volume of the cold air duct 11 decreases, the air volume of the primary air duct 12 increases.

[0020] like Figure 8 As shown, the driving mechanism 5 also includes a transmission rod 55 rotatably connected between the spiral guide plate 31 and the mounting shell 33, and a threaded rod 56 fixedly connected between the spiral guide plate 31 and the mounting shell 33, wherein the transmission rod 55 and the driving rod 511 are transmission-connected via a third gear set 53, a shaft and a fourth gear set 54; the transmission rod 55 has teeth evenly distributed on its surface, the transmission rod 55 is meshedly connected with the sealing plate 45, a spur gear 57 is threadedly connected on the threaded rod 56, the spur gear 57 is meshedly connected with the transmission rod 55, a third rotating ring 58 is rotationally connected to the side of the spur gear 57, a second rotating ring 452 is rotationally connected to the outer side of the sealing plate 45, and a third rotating ring 58 is connected between the second rotating ring 452 and the third rotating ring 58. Connecting frame 581; when the motor 51 drives the driving rod 511 to rotate, the transmission rod 55 is driven to rotate through the third gear set 53, the shaft and the fourth gear set 54. When the transmission rod 55 rotates, it drives the sealing plate 45 and the spur gear 57 to rotate. When the spur gear 57 rotates, it moves on the threaded rod 56, and then pushes the sealing plate 45 to move through the connecting frame 581 and the second rotating ring 452, thereby reducing the friction between the sealing plate 45 and the spiral guide plate 31. After the sealing plate 45 moves, the heat dissipation area of ​​the spiral guide plate 31 is adjusted, and when the air volume inside the cold air duct 11 increases, the sealing plate 45 moves to the right, and the heat dissipation area increases. When the air volume in the cold air duct 11 decreases, the sealing plate 45 moves to the left, and the heat dissipation area decreases.

[0021] Specifically, the temperature sensors installed on the coal pipe 3, the air inlet pipe 1, the cold air pipe 11 and the primary air pipe 12 monitor the temperature of each part in real time. When the temperature is too high, the motor 51 rotates, and the driving rod 511 transmits the power to the reduction box 34 through the second gear group 52 and the shaft. The reduction box 34 drives the first rotating rod 26 to rotate. The first rotating rod 26 is connected to a group of rotating shafts 24 in the air damper 2 on the primary air duct 12, so that the rotating shaft 24 rotates. A group of rotating shafts 24 in the air damper 2 on the cold air duct 11 is connected to the first rotating rod 26 through the second rotating rod 27, and the first gear group 28 is provided between the two to realize linkage. When the rotating shaft 24 of the air damper 2 on the primary air duct 12 rotates, the connecting rod 25 and the linkage ring 23 drive the other rotating shafts 24 and the gate plate 22 to rotate, thereby reducing the primary air volume; at the same time, the air damper 2 on the cold air duct 11 is linked, and the gate plate 22 is reversed. The motor 51 drives the driving rod 511 to rotate, and at the same time, the driving rod 511 drives the transmission rod 55 to rotate through the third gear set 53, the shaft and the fourth gear set 54. When the transmission rod 55 rotates, on the one hand, due to its meshing connection with the sealing plate 45, it will drive the sealing plate 45 to rotate; on the other hand, the transmission rod 55 drives the spur gear 57 meshing therewith to rotate, and the spur gear 57 moves on the threaded rod 56. The spur gear 57 pushes the sealing plate 45 to move through the connecting frame 581 and the second rotating ring 452, thereby reducing the friction between the sealing plate 45 and the spiral guide plate 31, and causing the sealing plate 45 to move to the right, thereby increasing the heat dissipation area of ​​the cold air flowing through the spiral guide plate 31 and the coal pipe 3, and enhancing the heat dissipation of the coal pipe 3.

[0022] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0023] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A coal mill outlet temperature deviation optimization control device, comprising an air inlet pipe (1) connected to the air inlet of the coal mill and a coal pipe (3) connected to the coal mill outlet, characterized in that: The end of the air inlet pipe (1) away from the air inlet of the coal mill is connected to a cold air pipe (11) and a primary air pipe (12); a flexible butt joint pipe (13) is installed on the top of the cold air pipe (11); dampers (2) are installed on the cold air pipe (11) and the primary air pipe (12); the two groups of dampers (2) are used to control the cold air volume and the primary air volume respectively; a spiral guide plate (31) is installed on the outside of the coal pipe (3); an air duct adjustment component (4) whose horizontal length can be adjusted telescopically is also installed on the outside of the coal pipe (3); the lower part of the inside of the air duct adjustment component (4) is connected to the flexible butt joint pipe (13); a driving mechanism (5) is arranged on the outside of the air duct adjustment component (4); the driving mechanism (5) is used to adjust the telescopic length of the air duct adjustment component (4) and control the air volume of the two groups of dampers (2); and temperature sensors are installed on the coal pipe (3), the air inlet pipe (1), the cold air pipe (11) and the primary air pipe (12); The air duct adjustment assembly (4) comprises a sealing ring (41), a first movable ring (42), a second movable ring (43), a third movable ring (44) and a sealing plate (45) which are sequentially arranged outside the coal pipe (3), wherein one end of the sealing ring (41) is closed and wraps the spiral guide plate (31) therein, a cold air inlet pipe (46) is installed near the outlet end of the coal mill on the sealing ring (41), the sealing ring (41), the first movable ring (42), the second movable ring (43) and the third movable ring (44) are sequentially slidably connected, the sealing plate (45) is threadedly connected to the spiral guide plate (31), and the sealing plate (45) and the third movable ring (44) are rotatably connected via a first rotating ring (451), as shown in FIG. 7, a cold air collecting plate (47) is arranged at the bottom of the third movable ring (44), and the cold air collecting plate (47) is connected to the third movable ring (44) and the flexible butt pipe (13).

2. A coal mill outlet temperature deviation optimization control device according to claim 1, characterized in that: The sealing ring (41), the first movable ring (42) and the second movable ring (43) are provided with sliding grooves on the outside, the first movable ring (42), the second movable ring (43) and the third movable ring (44) are provided with sliding blocks corresponding to the sliding grooves on the inside, and a return spring (48) is fixedly installed between the sealing ring (41) and the sealing plate (45).

3. The coal mill outlet temperature deviation optimization control device according to claim 1, characterized in that: The length of the sealing plate (45) is greater than the lengths of the sealing ring (41), the first movable ring (42) and the second movable ring (43), so that the cold air collecting plate (47) will not be blocked by the second movable ring (43) after shrinkage.

4. The coal mill outlet temperature deviation optimization control device according to claim 1, characterized in that: The exterior of the spiral guide plate (31) is in a stepped shape, and the exterior of the spiral guide plate (31) fits with the sealing ring (41), the first movable ring (42), the second movable ring (43), and the third movable ring (44) after they are unfolded.

5. The coal mill outlet temperature deviation optimization control device according to claim 1, characterized in that: The wind damper (2) comprises a housing (21) and a damper plate (22) movably arranged inside the housing (21), wherein the damper plates (22) are arranged in a plurality of groups, and the housing (21) is provided with a plurality of rotating shafts (24) distributed radially, wherein the rotating shafts (24) extend into the interior of the housing (21) and are fixedly connected to the damper plates (22), and the rotating shafts (24) are rotatably connected to the housing (21), and the exterior of the housing (21) is rotatably connected to a linkage ring (23), wherein the linkage ring (23) is movably connected to the rotating shaft (24) via a connecting rod (25), and a manual pull rod (231) is also fixedly connected to the linkage ring (23).

6. A coal mill outlet temperature deviation optimization control device as claimed in claim 5, characterized in that: The outside of the coal pipe (3) is fixedly connected to a fixing plate (32) and a mounting shell (33); the driving mechanism (5) comprises a motor (51) fixedly arranged outside the mounting shell (33); the output end of the motor (51) is fixedly connected to a driving rod (511); and the driving rod (511) extends to the inside of the mounting shell (33).

7. A coal mill outlet temperature deviation optimization control device as claimed in claim 6, characterized in that: A reduction box (34) is disposed at the bottom of the mounting shell (33); the middle portion of the driving rod (511) is connected to the reduction box (34) via a second gear set (52) and a shaft; and a first rotating rod (26) is connected below the reduction box (34).

8. A coal mill outlet temperature deviation optimization control device as claimed in claim 7, characterized in that: The other end of the first rotating rod (26) is connected to one of the rotating shafts (24) inside the wind damper (2) on the primary air duct (12); a second rotating rod (27) is connected to one of the rotating shafts (24) inside the wind damper (2) on the cold air duct (11); and a first gear set (28) is installed between the second rotating rod (27) and the first rotating rod (26).

9. A coal mill outlet temperature deviation optimization control device as claimed in claim 8, characterized in that: The driving mechanism (5) further comprises a transmission rod (55) rotatably connected between the spiral guide plate (31) and the mounting shell (33), and a threaded rod (56) fixedly connected between the spiral guide plate (31) and the mounting shell (33), wherein the transmission rod (55) and the driving rod (511) are transmission-connected via a third gear set (53), a shaft, and a fourth gear set (54).

10. The coal mill outlet temperature deviation optimization control device according to claim 9, characterized in that: The transmission rod (55) has teeth grooves evenly distributed on its surface. The transmission rod (55) is meshedly connected to the sealing plate (45). A spur gear (57) is threadedly connected to the threaded rod (56). The spur gear (57) is meshedly connected to the transmission rod (55). A third rotating ring (58) is rotatably connected to the side of the spur gear (57). A second rotating ring (452) is rotatably connected to the outer side of the sealing plate (45). A connecting frame (581) is connected between the second rotating ring (452) and the third rotating ring (58).

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