Boiler secondary air distribution box flow field flow equalizing and resistance reducing optimizing and flow measuring device

Abstract

The invention discloses a boiler secondary air distribution box flow field flow equalizing and resistance reducing optimizing and flow measuring device, and relates to the technical field of boiler secondary air distribution boxes, the boiler secondary air distribution box flow field flow equalizing and resistance reducing optimizing and flow measuring device comprises a main pipeline and two elbow pipelines communicated with the main pipeline, and transition chamfers used for reducing air resistance are arranged at the ends of the elbow pipelines. A grating plate and a flow equalizing assembly which are used for promoting uniform distribution of secondary air flow are mounted in the elbow pipeline and are arranged side by side; the flow equalizing assembly comprises a flow guide plate fixedly installed on the inner wall of the elbow pipeline. The grating plate and the flow equalizing assembly are arranged in the elbow pipeline, secondary air flow field distribution can be optimized, uniform secondary air distribution is achieved, the transition chamfer is matched, airflow resistance in the elbow pipeline can be reduced, stability and uniformity of airflow in the pipeline can be improved, the measurement accuracy of the wind measurement element can be improved, and the measurement precision of the wind measurement element can be improved. And the overall air distribution uniformity of the boiler can be optimized.

Description

Technical Field

[0001] The invention relates to the technical field of boiler secondary wind boxes, and in particular to a flow field average flow resistance reduction optimization and flow measurement device for a boiler secondary wind box. Background Art

[0002] The existing boiler secondary air system usually consists of two parts: the ember wind box and the burner secondary wind box, which are used to provide the secondary air supply required for furnace combustion. Flow measurement points are arranged in the ember air duct and the burner secondary air to monitor the distribution of secondary air volume. However, due to the short straight pipe section of the pipeline, the uneven flow field distribution and susceptibility to interference, the measurement accuracy of the flow measurement points is poor, and it is difficult for the system to accurately control the deviation of the secondary air volume at the inlet of the wind boxes at the corners of the front and rear walls. Due to the poor flow measurement accuracy of each secondary air distribution wind box, the overall air distribution of the boiler is uneven, causing the furnace combustion condition to deteriorate, the furnace heat load distribution is uneven, and the furnace tube wall overheating and high-temperature corrosion occur, and the unit steam temperature regulation characteristics are poor. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a boiler secondary wind box flow field average flow resistance reduction optimization and flow measurement device, which solves the technical problems raised in the above background technology.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions: a boiler secondary wind box flow field flow equalization drag reduction optimization and flow measurement device, comprising a main pipeline and two elbow pipelines connected and installed with the main pipeline, the ends of the elbow pipelines are provided with transition chamfers for reducing wind resistance, and the inside of the elbow pipelines is provided with a grid plate and a flow equalization component for promoting uniform distribution of secondary airflow, and the grid plate and the flow equalization component are arranged side by side; The flow equalizing component includes a guide plate fixedly installed on the inner wall of the elbow pipe, a plurality of funnel-shaped guide holes are opened on the guide plate, and support rods are installed at the four corners of the guide plate, a ventilation plate is fixedly installed between the four support rods, and a plurality of flow equalizing rods with triangular cross-sections are rotatably installed inside the ventilation plate, longitudinal wind dividing plates are arranged on the left and right sides of the ventilation plate, and transverse wind dividing plates are arranged on the upper and lower sides of the ventilation plate, and a driving member for driving the flow equalizing rod, the longitudinal wind dividing plate and the transverse wind dividing plate to swing synchronously is also provided on the ventilation plate.

[0005] Furthermore, the grid plate is provided with a hollow portion and a solid portion, and the guide hole is aligned with the solid portion.

[0006] Furthermore, the area of ​​the hollow portion accounts for 60%-75% of the total area of ​​the grid plate, and the opening area of ​​the guide holes accounts for 70%-90% of the total area of ​​the guide plate.

[0007] Furthermore, the midline of the ventilation plate coincides with the midline of the guide plate, and the area of ​​the ventilation plate is 40%-60% of the area of ​​the guide plate.

[0008] Furthermore, the driving component includes a servo motor fixedly mounted on the side of the ventilation plate, the output end of the servo motor is fixedly connected to the end of one of the current equalizing rods, and the ends of multiple current equalizing rods away from the servo motor are fixedly connected to a pulley 1, and a synchronous belt 1 is commonly arranged on the outside of the multiple pulleys 1.

[0009] Furthermore, one end of one of the horizontal wind-dividing plates is fixedly connected to a rotating shaft 1, and a first transmission member is arranged on the rotating shaft 1. The first transmission member includes a pulley 2 fixedly sleeved on the outside of the rotating shaft 1. The bottom of the ventilation plate is rotatably mounted with the rotating shaft 2, and the external fixed sleeve of the rotating shaft 2 is provided with a pulley 3 and a gear 1, and a synchronous belt 2 is installed on the outside of the pulley 2 and the pulley 3. The end of the other horizontal wind-dividing plate is fixedly connected to a gear 2 meshing with the gear 1.

[0010] Furthermore, a second transmission member is provided on the back of the ventilation plate, and the second transmission member includes a fixing rod fixedly installed on the back of the ventilation plate, and the top of the fixing rod is slidably connected to a slide, and connecting rods are rotatably installed at both ends of the slide, and the end of the connecting rod is rotatably connected to a connecting seat, and the connecting seat is slidably installed on the side of the longitudinal wind plate.

[0011] Furthermore, a rotating shaft three is rotatably mounted on the back of the ventilation plate, an external fixed sleeve of the rotating shaft three is provided with a cam, and two symmetrically arranged connecting springs are installed between the slide and the ventilation plate.

[0012] Furthermore, the ends of the rotating shaft one and the rotating shaft three are fixedly connected with pulleys four, the axis of one of the pulleys one is fixedly connected with pulley five, and the outsides of the pulley five and the two pulleys four are jointly installed with a synchronous belt three.

[0013] By means of the above technical solution, the present invention provides a boiler secondary wind box flow field average flow reduction resistance optimization and flow measurement device, which has at least the following beneficial effects: 1. The present invention can optimize the secondary air flow field distribution and realize uniform secondary air distribution by arranging a grid plate and a flow equalizing component in the elbow pipe. Combined with the transition chamfer, the air flow resistance in the elbow pipe can be reduced, and the stability and uniformity of the air flow in the pipe can be improved, thereby improving the measurement accuracy of the wind measuring element and helping to optimize the uniformity of the overall air distribution of the boiler.

[0014] 2. The present invention helps to ensure smooth flow of air by controlling the proportion and layout of the hollow part and the guide holes, ensuring that the airflow passes through the guide plate and the grille plate evenly while reducing the pressure drop and resistance of the airflow on the surfaces of the two, thereby improving the airflow passing rate.

[0015] 3. The present invention can guide part of the airflow in the central area of ​​the elbow pipe to the edge of the guide plate by setting the longitudinal wind dividing plate and the transverse wind dividing plate, so that the airflow can pass through the guide plate evenly, reduce the flow difference between the airflow in the central area of ​​the elbow pipe and the airflow on the inner wall, and realize uniform distribution of the airflow. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings: Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the internal structure of the elbow pipeline of the present invention; Figure 3 This is one of the schematic diagrams of the structure of the current balancing component of the present invention; Figure 4 This is the second structural schematic diagram of the current balancing component of the present invention; Figure 5 for Figure 4 The enlarged view of point A is shown; Figure 6 is a cross-sectional view of a ventilation plate of the present invention; Figure 7 It is a schematic diagram of the structure of the grid plate and the guide plate of the present invention; Figure 8 It is a cross-sectional view of the grid plate and the guide plate of the present invention.

[0017] In the figure: 1. Main pipeline; 2. Elbow pipe; 3. Grid plate; 31. Hollow part; 32. Solid part; 4. Flow-equalizing assembly; 41. deflector plate; 42. deflector hole; 43. support rod; 44. ventilation plate; 45. flow-equalizing rod; 46. longitudinal wind plate; 47. transverse wind plate; 48. driving member; 481. servo motor; 482. pulley one; 483. synchronous belt one; 484. rotating shaft one; 485. first transmission member; 4851. pulley two; 4852. rotating shaft two; 4853. pulley three; 4854. synchronous belt two; 4855. gear one; 4856. gear two; 486. second transmission member; 4861. fixing rod; 4862. carriage; 4863. connecting rod; 4864. connecting seat; 4865. rotating shaft three; 4866. cam; 4867. connecting spring; 489. pulley four; 4810. pulley five; 4811. synchronous belt three; 5. Transition chamfer. DETAILED DESCRIPTION

[0018] 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.

[0019] Embodiment 1

[0020] Since the existing secondary air distribution box pipeline has a short straight pipe section, the flow field distribution is uneven and easily disturbed, the measurement accuracy of the flow measurement point is poor, and it is difficult for the system to accurately control the deviation of the secondary air volume at the inlet of the wind boxes at the corners of the front and rear walls. Due to the poor flow measurement accuracy of each secondary air distribution box, the overall air distribution of the boiler is uneven, causing the furnace combustion condition to deteriorate, the furnace heat load to be unevenly distributed, the furnace tube wall to overheat and high-temperature corrosion, and poor steam temperature regulation characteristics of the unit.

[0021] To solve the defects of the above-mentioned device during the use of the bellows, please refer to Figure 1-Figure 8 The present invention provides a boiler secondary wind box flow field equalization and drag reduction optimization and flow measurement device, which can optimize the secondary air flow field distribution and improve the accuracy of flow measurement point measurement without changing the original secondary air duct layout. The secondary wind box is based on a main pipe 1 and two elbow pipes 2 connected to the main pipe 1. Multiple wind measuring elements are arranged in the main pipe 1 and the elbow pipe 2. The wind measuring elements are existing technologies, and their measurement principles are not described in detail here. Multiple wind measuring elements can realize multi-point measurement, which can improve the measurement accuracy compared with the traditional single-point measurement. The end of the elbow pipe 2 is provided with a transition chamfer 5 for reducing wind resistance, and the interior of the elbow pipe 2 is installed with a grille plate 3 and a flow equalization component 4 for promoting uniform distribution of secondary airflow. The grille plate 3 and the flow equalization component 4 are arranged side by side; a guide plate 41 is fixedly installed on the inner wall of the elbow pipe 2, and a plurality of funnel-shaped guide holes 42 are opened on the guide plate 41, and the four corners of the guide plate 41 are all installed. A support rod 43 is installed, and a ventilation plate 44 is fixedly arranged between the four support rods 43. A plurality of equalizing rods 45 with a triangular cross-section are rotatably installed inside the ventilation plate 44. The airflow enters the main pipe 1 from the elbow pipe 2 and passes through the ventilation plate 44, the guide plate 41 and the grille plate 3 in sequence. When the airflow passes through the ventilation plate 44, it can be preliminarily divided by the equalizing rod 45. The divided airflow passes through the equalizing rod 45 and enters the guide hole 42. The diameter of the guide hole 42 gradually decreases from front to back. The guide hole 42 can fully collect the airflow, evenly guide the airflow to the grille plate 3, and then evenly release it from the grille plate 3 to enter the main pipe 1 through the transition chamfer 5. The setting of the transition chamfer 5 can help the airflow to smoothly and steadily transition to the main pipe 1, thereby improving the flow efficiency.

[0022] In order to achieve the effect of uniform airflow passing through the grille plate 3, the grille plate 3 is provided with a hollow portion 31 and a solid portion 32, and the guide hole 42 is aligned with the solid portion 32. The airflow entering the guide hole 42 can flow to the solid portion 32, and then be evenly dispersed from the solid portion 32 to the hollow portion 31 around the solid portion 32, thereby achieving the effect of uniform airflow passing through the hollow portion 31.

[0023] Since the grille plate 3 and the guide plate 41 may increase wind resistance, the area of ​​the hollow portion 31 accounts for 60%-75% of the total area of ​​the grille plate 3, the opening area of ​​the guide hole 42 accounts for 70%-90% of the total area of ​​the guide plate 41, and the mid-vertical line of the ventilation plate 44 coincides with the mid-vertical line of the guide plate 41, and the area of ​​the ventilation plate 44 is 40%-60% of the area of ​​the guide plate 41. By controlling the proportion and layout of the hollow portion 31 and the guide hole 42, the airflow can be made to flow as smoothly as possible, ensuring uniform passage of the airflow while reducing the pressure drop and resistance of the airflow on the surface of the component, thereby improving the airflow pass rate.

[0024] Embodiment 2

[0025] When the airflow flows in the elbow pipe 2, most of the airflow will pass through the center of the guide plate 41, while a small part of the airflow will pass through the edge of the guide plate 41. This will cause the flow velocity and flow rate at the center of the elbow pipe 2 to be different from the flow velocity and flow rate at the inner wall of the elbow pipe 2, which will affect the detection accuracy of the wind measuring element. In order to solve this technical problem, longitudinal wind plates 46 are provided on the left and right sides of the ventilation plate 44, and transverse wind plates 47 are provided on the upper and lower sides of the ventilation plate 44. The airflow at the center of the elbow pipe 2 passes through the ventilation plate 41. 4, the longitudinal wind plate 46 and the transverse wind plate 47 can guide part of the airflow to the inner wall of the elbow pipe 2, reducing the flow difference between the central airflow of the elbow pipe 2 and the airflow on the inner wall of the elbow pipe 2. The setting of the flow equalizing rod 45 can, on the one hand, make the airflow in the center of the elbow pipe 2 pass evenly, and on the other hand, reduce the airflow velocity in the center of the elbow pipe 2, thereby reducing the velocity difference between the central airflow of the elbow pipe 2 and the airflow on the inner wall of the elbow pipe 2, and improving the consistency and uniformity of the flow rate and velocity of the airflow in the elbow pipe 2, thereby ensuring the accuracy of the wind measuring element measurement.

[0026] In order to make the ventilation plate 44 deliver the airflow evenly to the guide plate 41, a driving member 48 is also provided on the ventilation plate 44 to drive the flow equalizing rod 45, the longitudinal air dividing plate 46 and the transverse air dividing plate 47 to swing synchronously. The driving member 48 is set to be a servo motor 481 fixedly installed on the side of the ventilation plate 44, and the output end of the servo motor 481 is fixedly connected to the end of one of the flow equalizing rods 45, and the ends of the multiple flow equalizing rods 45 away from the servo motor 481 are fixedly connected to a pulley 482, and the multiple pulleys 482 are fixedly connected to the ends of the multiple flow equalizing rods 45 away from the servo motor 481. A synchronous belt 483 is commonly provided on the outside of 482, which drives the servo motor 481 to make one of the equalizing rods 45 swing. The swing of the equalizing rod 45 drives the corresponding pulley 482 to swing. The pulley 482 drives multiple synchronous belts 483 to swing synchronously through the synchronous belt 483. Multiple synchronous belts 483 can drive multiple equalizing rods 45 to swing synchronously. The swing of the equalizing rod 45 can change the air outlet direction of the ventilation plate 44, so that the airflow can be evenly delivered to the guide plate 41.

[0027] In order to evenly deliver the airflow to the edge of the guide plate 41, that is, the inner wall of the elbow pipe 2, a rotating shaft 484 is fixedly connected to the end of one of the transverse air-dividing plates 47, and a first transmission member 485 is arranged on the rotating shaft 484. The first transmission member 485 includes a pulley 2 4851 fixedly sleeved on the outside of the rotating shaft 484, and a rotating shaft 2 4852 is rotatably installed at the bottom of the ventilation plate 44. The external fixed sleeve of the rotating shaft 2 4852 is provided with a pulley 3 4853 and a gear 1 4855. A synchronous belt 2 4854 is installed on the outside of the pulley 2 4851 and the pulley 3 4853. The end of the other transverse air-dividing plate 47 is fixedly connected with a gear meshing with the gear 1 4855. The rotation of gear two 4856 and shaft one 484 can drive the transverse air plate 47 to rotate, and at the same time, the rotation of shaft two 4852 can be driven by pulley two 4851, pulley three 4853 and synchronous belt two 4854. The rotation of shaft two 4852 drives gear one 4855 to rotate, and the rotation of gear one 4855 drives gear two 4856 to rotate in the opposite direction. The reverse rotation of gear two 4856 drives the other transverse air plate 47 to rotate in the opposite direction, thereby realizing the reciprocating swing of the two transverse air plates 47. When the airflow passes through the transverse air plate 47, it can flow along the transverse air plate 47 to the upper and lower sides of the guide plate 41, thereby increasing the airflow flow on the upper and lower sides of the guide plate 41 and reducing the flow difference in the elbow pipe 2.

[0028] While distributing part of the airflow to the upper and lower sides of the guide plate 41, it is also necessary to distribute part of the airflow to the left and right sides of the guide plate 41. Therefore, a second transmission member 486 is provided on the back of the ventilation plate 44. The second transmission member 486 includes a fixed rod 4861 fixedly installed on the back of the ventilation plate 44. The top of the fixed rod 4861 is slidably connected with a slide 4862. Both ends of the slide 4862 are rotatably installed with a connecting rod 4863. The end of the connecting rod 4863 is rotatably connected with a connecting seat 4864. The connecting seat 4864 is slidably installed on the side of the longitudinal wind plate 46. The back of the ventilation plate 44 is also rotatably installed with a rotating shaft 4865. The outer fixing sleeve of the rotating shaft 4865 A cam 4866 is provided, and the cam 4866 abuts against the side of the fixed rod 4861. Two symmetrically arranged connecting springs 4867 are installed between the slide 4862 and the ventilation plate 44. The rotation of the rotating shaft 4865 can drive the cam 4866 to rotate. The rotation of the cam 4866 can squeeze the fixed rod 4861 to slide. The elastic force of the connecting spring 4867 can realize the reciprocating sliding of the fixed rod 4861. The reciprocating sliding of the fixed rod 4861 can drive the connecting rod 4863 to rotate reciprocatingly. The reciprocating rotation of the connecting rod 4863 can drive the two longitudinal wind plates 46 to swing reciprocatingly, so that part of the airflow can be guided to the left and right sides of the guide plate 41 to achieve uniform distribution of the airflow.

[0029] In order to realize the synchronous rotation of rotating shaft three 4865 and rotating shaft one 484, pulley four 489 are fixedly connected to the ends of rotating shaft one 484 and rotating shaft three 4865, and the axis of one pulley one 482 is fixedly connected to pulley five 4810, and the outside of pulley five 4810 and two pulley fours 489 are jointly installed with synchronous belt three 4811. The rotation of flow equalizing rod 45 can drive rotating shaft three 4865 and rotating shaft one 484 to rotate synchronously through pulley five 4810, pulley four 489 and synchronous belt three 4811, so as to realize the synchronous swinging of transverse air dividing plate 47 and longitudinal air dividing plate 46, and distribute part of the airflow in elbow pipe 2 to the edge of guide plate 41, so as to optimize the flow field distribution.

[0030] The control method of the present invention is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by technicians in this field. The provision of power is also common knowledge in this field. The present invention is mainly used to protect mechanical devices, so the present invention will no longer explain the control method and circuit connection in detail.

[0031] 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.

[0032] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A boiler secondary wind box flow field average flow resistance reduction optimization and flow measurement device, comprising a main pipeline (1) and two elbow pipelines (2) connected to the main pipeline (1), characterized in that: The end of the elbow pipe (2) is provided with a transition chamfer (5) for reducing wind resistance, and a grid plate (3) and a flow equalizing component (4) for promoting uniform distribution of secondary airflow are installed inside the elbow pipe (2), and the grid plate (3) and the flow equalizing component (4) are arranged side by side; The flow balancing component (4) comprises a flow guide plate (41) fixedly mounted on the inner wall of the elbow pipe (2), the flow guide plate (41) being provided with a plurality of funnel-shaped flow guide holes (42), and support rods (43) being mounted at four corners of the flow guide plate (41), a ventilation plate (44) being fixedly mounted between the four support rods (43), a plurality of flow balancing rods (45) having a triangular cross section being rotatably mounted inside the ventilation plate (44), longitudinal air dividing plates (46) being mounted on the left and right sides of the ventilation plate (44), and transverse air dividing plates (47) being mounted on the upper and lower sides of the ventilation plate (44), and a driving member (48) being further provided on the ventilation plate (44) for driving the flow balancing rod (45), the longitudinal air dividing plates (46) and the transverse air dividing plates (47) to swing synchronously.

2. The boiler secondary wind box flow field average flow resistance reduction optimization and flow measurement device according to claim 1 is characterized in that: The grid plate (3) is provided with a hollow portion (31) and a solid portion (32), and the guide hole (42) is aligned with the solid portion (32).

3. The boiler secondary wind box flow field average flow resistance reduction optimization and flow measurement device according to claim 2 is characterized in that: The area of ​​the hollow portion (31) accounts for 60%-75% of the total area of ​​the grid plate (3), and the opening area of ​​the guide holes (42) accounts for 70%-90% of the total area of ​​the guide plate (41).

4. The boiler secondary wind box flow field average flow resistance reduction optimization and flow measurement device according to claim 1 is characterized in that: The mid-perpendicular line of the ventilation plate (44) coincides with the mid-perpendicular line of the guide plate (41), and the area of ​​the ventilation plate (44) is 40%-60% of the area of ​​the guide plate (41).

5. The boiler secondary wind box flow field average flow resistance reduction optimization and flow measurement device according to claim 1 is characterized in that: The driving member (48) comprises a servo motor (481) fixedly mounted on a side of the ventilation plate (44); an output end of the servo motor (481) is fixedly connected to an end of one of the current equalizing rods (45); ends of the plurality of current equalizing rods (45) away from the servo motor (481) are fixedly connected to a pulley one (482); and a synchronous belt one (483) is commonly disposed outside the plurality of pulleys one (482).

6. The boiler secondary wind box flow field average flow resistance reduction optimization and flow measurement device according to claim 5 is characterized in that: The end of one of the transverse air-dividing plates (47) is fixedly connected to a rotating shaft 1 (484), the rotating shaft 1 (484) is provided with a first transmission member (485), the first transmission member (485) comprises a pulley 2 (4851) fixedly sleeved on the outside of the rotating shaft 1 (484), the bottom of the ventilation plate (44) is rotatably mounted with a rotating shaft 2 (4852), the external fixed sleeve of the rotating shaft 2 (4852) is provided with a pulley 3 (4853) and a gear 1 (4855), and a synchronous belt 2 (4854) is installed on the outside of the pulley 2 (4851) and the pulley 3 (4853), and the end of the other transverse air-dividing plate (47) is fixedly connected to a gear 2 (4856) meshing with the gear 1 (4855).

7. The boiler secondary wind box flow field average flow resistance reduction optimization and flow measurement device according to claim 6 is characterized in that: A second transmission member (486) is provided on the back of the ventilation plate (44), and the second transmission member (486) includes a fixing rod (4861) fixedly mounted on the back of the ventilation plate (44), a slide frame (4862) being slidably connected to the top of the fixing rod (4861), connecting rods (4863) being rotatably mounted on both ends of the slide frame (4862), and an end of the connecting rod (4863) being rotatably connected to a connecting seat (4864), and the connecting seat (4864) being slidably mounted on the side of the longitudinal wind plate (46).

8. The boiler secondary wind box flow field average flow resistance reduction optimization and flow measurement device according to claim 7 is characterized in that: A rotating shaft (4865) is rotatably mounted on the back of the ventilation plate (44); an external fixed sleeve of the rotating shaft (4865) is provided with a cam (4866); and two symmetrically arranged connecting springs (4867) are mounted between the slide (4862) and the ventilation plate (44).

9. The boiler secondary wind box flow field average flow resistance reduction optimization and flow measurement device according to claim 8, characterized in that: The ends of the rotating shaft one (484) and the rotating shaft three (4865) are fixedly connected to pulley four (489), the axis of one of the pulleys one (482) is fixedly connected to pulley five (4810), and the outsides of the pulley five (4810) and the two pulleys four (489) are jointly installed with a synchronous belt three (4811).

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