Adjusting device for blades of blind window of direct-current pulverized coal burner
By designing a blind blade adjustment device for DC coal powder burner, the problem of insufficient angle adjustment ability of blind blades in the prior art is solved, the coal powder thickness ratio is optimized, the combustion efficiency and service life are improved, and the generation of NOx is effectively suppressed.
Patent Information
- Application Number
- CN202421570768.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-04
- Publication Date
- 2025-04-25
- Estimated Expiration
- 2034-07-04
AI Technical Summary
The existing DC coal powder burners lack the angle adjustment ability of the blind blades, which makes it difficult to adjust the thickness and light ratio of the coal powder, affecting the combustion efficiency and NOx suppression effect.
An adjustment device including blind blades, driving links, adjustment handles, lock nuts, active swing cranks, locking shafts, connecting rods and driven swing cranks are designed. The angle of the shutter blades is adjusted by adjusting the handle.
The angle adjustment of the blind blades is realized, the coal powder and thickness ratio is optimized, the combustion efficiency is improved, the service life of the burner is extended, and the generation of NOx is effectively suppressed.
Smart Images
Figure CN222798969U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a boiler combustion system structure, in particular to an adjusting device for shutter blades of a direct current pulverized coal burner. Background Art
[0002] The qualified coal powder ground by the coal mill is transported to the burner inlet through the powder delivery system. The coal powder is separated into thick and thin under the action of centrifugal force at the burner inlet elbow and the thick and thin separation structure inside. The dense phase coal powder is located on the fire side, at high temperature and high coal powder concentration, so that the coal powder burns in a reducing atmosphere, prolonging the residence time in the reducing atmosphere, which can effectively inhibit the formation of NOx. It is conducive to the initial ignition of coal powder and inhibits the generation of NOx. The light phase coal powder is relatively less oxidizing zone, which can effectively control the oxidizing atmosphere near the water-cooled wall, reduce coking, reduce high-temperature corrosion, and provide sufficient oxygen for the subsequent combustion of coal powder. The combination of dense and thin combustion and secondary air classification combustion can achieve maximum low NOx combustion.
[0003] If the design of using louver blades for thick and thin separation is simpler and more reliable in mechanical structure, it can provide a longer service life and the ability of long-term continuous operation, simplify combustion adjustment and operation, from the trial operation period to the end of combustion adjustment work, even if the operating coal quality fluctuates within a wider range, therefore, it is necessary to have a structure for adjusting the louver blades in the DC pulverized coal burner. Utility Model Content
[0004] The utility model provides a shutter type blade adjustment device for a DC pulverized coal burner, which solves the problem that the shutter blades can be angle-adjusted which is not available in the existing DC pulverized coal burner.
[0005] The technical solution adopted by the utility model to solve the above problems is:
[0006] An adjusting device for shutter blades of a DC pulverized coal burner comprises a set of shutter blades, a set of driving connecting rods, an adjusting handle, a locking nut, an active swing crank, a locking shaft, a connecting rod connector and a plurality of driven swing cranks;
[0007] A group of louver blades are rotatably connected and arranged on the nozzle body, a group of louver blades are connected to a group of driving connecting rods through multiple driven swing cranks and connecting rod connectors, a group of driving connecting rods are rotatably connected to the working end of the adjusting handle through the active swing crank, an arc hole is processed on the adjusting handle, the top end of the locking shaft passes through the arc hole of the adjusting handle and is threadedly connected to the locking nut, the driving end of the adjusting handle is fixedly connected to the handle driving rod, the arc hole of the adjusting handle is arranged between the working end of the adjusting handle and the driving end of the adjusting handle, the bottom end of the locking shaft is fixedly connected to the nozzle body, and the nozzle is fixed to the nozzle body through fixing pins on both sides.
[0008] Further, it comprises a group of shutter blades in which the number of the shutter blades is three to seven.
[0009] Further, the number of the driven swing cranks is the same as the number of the shutter blades.
[0010] Furthermore, a group of driving connecting rods includes a plurality of driving connecting rods of different lengths, the number of a group of driving connecting rods is the same as the number of driven swing cranks, and each driven swing crank is rotationally connected to a driving connecting rod.
[0011] Furthermore, it also includes multiple top fixed shafts, multiple bottom fixed shafts and multiple blade shafts. The louver blades are installed inside the nozzle body through the top fixed shafts and the bottom fixed shafts. The top fixed shaft is fixedly connected to the blade shaft, and one end of each driven swing crank is fixedly connected to the blade shaft to drive the blade shaft to rotate.
[0012] Furthermore, one driving connecting rod in a group of driving connecting rods is rotationally connected to one end of the active swing crank, and the driving connecting rod connected to the active swing crank is rotationally connected to other driving connecting rods through connecting rod connectors.
[0013] Furthermore, it also includes a rotating shaft and a fixed sleeve; the rotating shaft is rotatably connected and installed on the working end of the adjusting handle, the fixed sleeve is sleeved on the rotating shaft, the active swing crank is fixedly connected to the fixed sleeve, and the active swing crank is rotatably connected to the adjusting handle through the rotating shaft and the fixed sleeve.
[0014] Furthermore, the adjustment handle is processed with angle scale values along the arc direction near the driving end, and the scale values are angles of +15° to -30°.
[0015] Beneficial effects of the utility model:
[0016] 1. The utility model adds a rotation function to the fixed axis of the shutter blades inside the DC pulverized coal burner, so as to adjust the angle of the shutter blades, thereby improving the pulverized coal combustion efficiency, improving the boiler efficiency, and improving the economic benefits of the coal-fired unit.
[0017] 2. After the shutter blades are adjusted, the appropriate blade angle can appropriately increase the service life of the blades, thereby increasing the service life of the burner.
[0018] 3. The pulverized coal concentration regulating device for the burner of the utility model realizes the balanced distribution of pulverized coal concentration, ensures stable combustion of the boiler, balanced combustion flow field, reduces the deviation of smoke temperature on the left and right sides of the furnace, reduces the carbon content of fly ash, improves boiler efficiency, reduces smoke exhaust loss, and reduces nitrogen oxide emissions.
[0019] 4. The present application provides a shutter-type blade adjustment device for a DC pulverized coal burner, which solves the problem that the existing DC pulverized coal burners cannot be adjusted according to the concentration ratio requirements and the actual combustion effect of the burner, and can deeply optimize the function of suppressing and reducing NOx. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is the front view of the overall structure of the utility model;
[0021] Figure 2 yes Figure 1 A top view of
[0022] Figure 3 It is a schematic diagram showing that the adjusting handle 7 is connected to the active swing crank 11 via the rotating shaft 9 and the fixed sleeve 10. DETAILED DESCRIPTION
[0023] Specific implementation method 1: Combination Figure 1-Figure 3 The present embodiment is described as follows. The present embodiment is a device for adjusting the shutter blades of a DC pulverized coal burner, which comprises a set of shutter blades 1, a set of driving connecting rods 3, an adjusting handle 7, a locking nut 8, an active swing crank 11, a locking shaft 12, a connecting rod connector 15 and a plurality of driven swing cranks 2;
[0024] A group of louver blades 1 are rotatably connected and arranged on the nozzle body 13. A group of louver blades 1 are connected to a group of driving connecting rods 3 through multiple driven swing cranks 2 and connecting rod connectors 15. A group of driving connecting rods 3 are rotatably connected to the working end of the adjusting handle 7 through an active swing crank 11. An arc hole is processed on the adjusting handle 7. The top end of the locking shaft 12 passes through the arc hole of the adjusting handle 7 and is threadedly connected to the locking nut 8. The driving end of the adjusting handle 7 is fixedly connected to a handle driving rod 16. The arc hole of the adjusting handle 7 is arranged between the working end of the adjusting handle 7 and the driving end of the adjusting handle 7. The bottom end of the locking shaft 12 is fixedly connected to the nozzle body 13, and the nozzle 14 is fixed to the nozzle body 13 through fixing pins on both sides.
[0025] In this embodiment, a group of louver blade 1 adjustment devices are installed in the nozzle body 13. By observing the combustion effect in the furnace and analyzing the corresponding boiler parameter monitoring data, it is judged whether the coal powder concentration of different burners is reasonable. By changing the corresponding louver blade 1 adjustment device, the louver blade 1 is rotated to a corresponding angle, thereby changing the movement direction of the coal powder in the gas-solid two-phase flow, thereby optimizing the concentration ratio of the coal powder in each direct current coal powder burner, balancing the coal powder and air flow rates, improving the coal powder flow field distribution, and forming a better coal powder and air mixed gas-solid two-phase flow field.
[0026] When the shutter blade 1 is at the initial angle, the corresponding concentration ratio is the initial designed concentration ratio, and the regulating device does not adjust the gas-solid two-phase flow at this time; when the shutter blade is at an angle of 0 degrees with the axial direction, the coal powder concentration ratio in the corresponding nozzle body is the smallest, and the shutter blade has no concentration effect on the coal powder at this time; when the shutter blade is at the maximum angle with the axial direction, the coal powder concentration ratio entering the corresponding primary air duct is the largest. This regulating device can adjust the coal powder concentration ratio in each DC coal powder burner at any time according to needs, improve boiler combustion stability, improve combustion efficiency, and reduce coal consumption for power generation.
[0027] Specific implementation method 2: Combination Figure 1-Figure 3 The present embodiment is described as an adjusting device for louver blades of a DC pulverized coal burner, which includes a group of louver blades 1 in which the number of louver blades 1 is three to seven.
[0028] The plurality of louver blades 1 are arranged at equal intervals along the length direction of the nozzle body 13, and the plurality of louver blades 1 are arranged at equal intervals along the width direction of the nozzle body 13. Other methods are the same as those of the first embodiment.
[0029] Specific implementation method three: Combination Figure 1-Figure 3 This embodiment is described as an adjusting device for louver blades of a DC pulverized coal burner, wherein the number of driven swing cranks 2 is the same as the number of louver blades 1. Other methods are the same as those of the first embodiment.
[0030] Specific implementation method four: Combination Figure 1 This embodiment is described. In this embodiment, a device for adjusting the shutter blades of a DC pulverized coal burner is described. A set of driving connecting rods 3 includes a plurality of driving connecting rods 3 of different lengths. The number of a set of driving connecting rods 3 is the same as the number of driven swing cranks 2. Each driven swing crank 2 is rotatably connected to a driving connecting rod 3. Other methods are the same as those in the third embodiment.
[0031] Specific implementation method five: Combination Figure 1 This embodiment is described. This embodiment is a device for adjusting the shutter blades of a DC pulverized coal burner. It also includes a plurality of top fixed shafts 4, a plurality of bottom fixed shafts 5 and a plurality of blade shafts 6. The shutter blades 1 are installed inside the nozzle body 13 through the top fixed shafts 4 and the bottom fixed shafts 5. The top fixed shaft 4 is fixedly connected to the blade shaft 6. One end of each driven swing crank 2 is fixedly connected to the blade shaft 6 to drive the blade shaft 6 to rotate. Other methods are the same as those in the first embodiment.
[0032] In the embodiment of the present invention, the upper part of the shutter blade 1 is fixed to the upper part of the nozzle body 13 through the top fixed shaft 4, and the shutter blade 1 is fixed to the lower part of the nozzle body 13 through the bottom fixed shaft 5. The adjusting handle 7 performs angular rotation and swinging, driving the active swing crank 11 to perform angular rotation, and then driving the driving connecting rod 3 to move forward and backward. The driven swing crank 2 connected to the driving connecting rod 3 performs angular rotation under the drive of the driving connecting rod 3, and at this time, the blade shaft 6 connected to the driven swing crank 2 rotates at the same time, driving the shutter blade 1 to rotate, thereby realizing the angular rotation of the shutter blade 1. The active swing crank 11 drives the connecting rod 3 to perform straight movement, and then drives the driven swing crank 2 to perform swinging movement. The driven swing crank 2 is fixed on the shutter blade 1. With the swing of the driven swing crank 2, the blade shaft 6 is driven to perform rotational movement, driving the shutter blade 1 to rotate, and finally realizing the rotation of the shutter blade to the required angle. After rotating to the required angle, the adjusting handle 7 is locked and fixed to the locking shaft 12 by the locking nut 8 to prevent the blade angle from changing due to vibration during operation.
[0033] Specific implementation method six: Combination Figure 1 This embodiment is described. In this embodiment, a device for adjusting the shutter blades of a DC pulverized coal burner is described. One of a group of driving connecting rods 3 is rotatably connected to one end of an active swing crank 11, and the driving connecting rod 3 connected to the active swing crank 11 is rotatably connected to other driving connecting rods 3 through connecting rod connectors 15. Other methods are the same as those in the fifth embodiment.
[0034] In this embodiment, a driving connecting rod 3 connected to the active swing crank 11 drives the group of driving connecting rods 3 to move simultaneously, so as to drive all the driven swing connecting rods to perform rotational swinging motion.
[0035] Specific implementation method seven: Combination Figure 1 This embodiment is described. This embodiment is an adjustment device for the shutter blades of a DC pulverized coal burner, which also includes a rotating shaft 9 and a fixed sleeve 10; the rotating shaft 9 is rotatably connected and installed on the working end of the adjustment handle 7, the fixed sleeve 10 is sleeved on the rotating shaft 9, the active swing crank 11 is fixedly connected to the fixed sleeve 10, and the active swing crank 11 is rotatably connected to the adjustment handle 7 through the rotating shaft 9 and the fixed sleeve 10. The rotation of the adjustment handle 7 drives the fixed sleeve 10 and the active swing crank 11 to rotate around the rotating shaft 9. Other methods are the same as those of the specific embodiment 5.
[0036] The adjusting handle 7 drives the active swing crank 11 , and the adjusting handle 7 is locked and fixed by the locking nut 8 after each adjustment.
[0037] Specific implementation method eight: Combination Figure 1This embodiment is described as an adjustment device for the shutter blades of a DC pulverized coal burner. The adjustment handle 7 is processed with angle scale values along the arc direction near the driving end. The scale values are angles from 15° to -30°. Other methods are the same as those of the specific embodiment 5.
[0038] In this embodiment, a louver-type blade adjustment device for a DC pulverized coal burner is provided. As the angle of the scale on the adjustment handle 7 increases, the angle of the louver blade increases; conversely, as the angle of the scale on the adjustment handle decreases, the angle of the louver decreases.
[0039] As the angle of the scale on the adjustment handle 7 reaches the minimum state, the angle of the shutter blades is the minimum and is parallel to the center line of the burner. At this time, the concentration ratio of the burner is the minimum.
[0040] As the angle of the scale on the adjustment handle 7 reaches the maximum state, the angle of the shutter blades is the largest, and the light-dark ratio is the largest at this time.
[0041] In the present embodiment, a louver blade adjustment device for a DC pulverized coal burner is provided, wherein when the angle of the scale on the adjustment handle 7 is 0°, the louver blade angle is the initial angle, and the actual angle of any other adjusted louver blades is the initial design angle of the louver blades plus the angle of the scale reading, that is, the actual angle of the louver blades at this time.
Claims
1. An adjusting device for shutter blades of a DC pulverized coal burner, characterized in that: It comprises a group of shutter blades (1), a group of driving connecting rods (3), an adjusting handle (7), a locking nut (8), an active swing crank (11), a locking shaft (12), a connecting rod connecting piece (15) and a plurality of driven swing cranks (2); A group of shutter blades (1) are rotatably connected and arranged on a nozzle body (13); the group of shutter blades (1) are connected to a group of driving connecting rods (3) through a plurality of driven swing cranks (2) and connecting rod connecting pieces (15); the group of driving connecting rods (3) are rotatably connected to a working end of an adjusting handle (7) through an active swing crank (11); an arc-shaped hole is processed on the adjusting handle (7); the top end of a locking shaft (12) passes through the arc-shaped hole of the adjusting handle (7) and is threadedly connected to a locking nut (8); the driving end of the adjusting handle (7) is fixedly connected to a handle driving rod (16); the arc-shaped hole of the adjusting handle (7) is arranged between the working end of the adjusting handle (7) and the driving end of the adjusting handle (7); the bottom end of the locking shaft (12) is fixedly connected to the nozzle body (13); and the nozzle (14) is fixed to the nozzle body (13) through fixing pins on both sides.
2. The adjusting device for shutter blades of a DC pulverized coal burner according to claim 1, characterized in that: It comprises a group of shutter blades (1), wherein the number of the shutter blades (1) is three to seven.
3. The adjusting device for shutter blades of a DC pulverized coal burner according to claim 2, characterized in that: The number of the driven swing cranks (2) is the same as the number of the shutter blades (1).
4. The adjusting device for shutter blades of a DC pulverized coal burner according to claim 3, characterized in that: A group of driving connecting rods (3) comprises a plurality of driving connecting rods (3) of different lengths. The number of a group of driving connecting rods (3) is the same as the number of driven swing cranks (2). Each driven swing crank (2) is rotationally connected to a driving connecting rod (3).
5. The adjusting device for shutter blades of a DC pulverized coal burner according to claim 1, characterized in that: It also includes a plurality of top fixed shafts (4), a plurality of bottom fixed shafts (5) and a plurality of blade shafts (6); the shutter blades (1) are installed inside the nozzle body (13) via the top fixed shafts (4) and the bottom fixed shafts (5); the top fixed shafts (4) are fixedly connected to the blade shafts (6); one end of each driven swing crank (2) is fixedly connected to the blade shaft (6) to drive the blade shaft (6) to rotate.
6. The device for adjusting the shutter blades of a DC pulverized coal burner according to claim 4, characterized in that: One driving connecting rod (3) in a group of driving connecting rods (3) is rotationally connected to one end of an active swing crank (11), and the driving connecting rod (3) connected to the active swing crank (11) is rotationally connected to other driving connecting rods (3) via connecting rod connectors (15).
7. The device for adjusting the shutter blades of a DC pulverized coal burner according to claim 6, characterized in that: It also includes a rotating shaft (9) and a fixed shaft sleeve (10); the rotating shaft (9) is rotatably connected and installed on the working end of the adjusting handle (7); the fixed shaft sleeve (10) is sleeved on the rotating shaft (9); the active swing crank (11) is fixedly connected to the fixed shaft sleeve (10); and the active swing crank (11) is rotatably connected to the adjusting handle (7) via the rotating shaft (9) and the fixed shaft sleeve (10).
8. The device for adjusting the shutter blades of a DC pulverized coal burner according to claim 6, characterized in that: The adjusting handle (7) is provided with angle scale values along the arc direction near the driving end, and the scale values are angles ranging from +15° to -30°.