An eccentrically adjusted damper structure

Abstract

The application discloses a kind of eccentricity-regulated air door structures, including frame and baffle blade being installed in the inside of frame by drive shaft, at least one eccentric baffle is additionally arranged on baffle blade, the center surface of baffle blade is parallel to each other with eccentric baffle, and eccentric baffle and baffle blade are connected by at least two muscle plates;Eccentric baffle and muscle plate do not exceed the imaginary cylinder formed by drive shaft driving baffle blade rotation.This application, by muscle plate, connects eccentric baffle on the side of baffle blade, and eccentric baffle and muscle plate do not exceed the imaginary cylinder formed by drive shaft driving baffle blade rotation, so that neither affect the rotation control of baffle blade, nor can significantly improve the sensitivity of flow regulation, even if the opening of baffle blade reaches more than 60%, it can also realize the sensitive regulation of flow, instantaneous response load instruction, solves the series of problems caused by hot air regulating door regulation characteristics is not good;Simple structure, remarkable effect, strong practicability, easy to popularize.

Description

Technical Field

[0001] This invention relates to an eccentrically adjustable damper structure, belonging to the technical field of regulating dampers for flue gas systems in industrial production processes. Background Technology

[0002] In industrial production processes, flow regulation of flue gas systems typically employs dampers. A damper consists of at least a frame and damper blades. The damper blades are made of steel plates pressed into V-shapes and connected to an intermediate connecting plate, end plates, and a drive shaft (forming a streamlined shape). They rotate within a range of 0–90°, and the flue gas flow is adjusted by changing the angle of the damper blades. If a frame contains multiple damper blades, they are externally connected by a linkage mechanism for synchronized operation. However, the flow regulation characteristics of this commonly used industrial damper are poor; above 60% opening, it has almost no flow regulation effect, thus adversely affecting the corresponding industrial production process.

[0003] For example, the energy sector is developing clean and efficient coal-fired power. Besides using carbon capture technology to reduce carbon emissions from coal-fired power plants, retrofitting coal-fired power plants to improve their peak-shaving capacity, thereby improving the absorption of renewable energy and enhancing the economy and efficiency of coal-fired units, are also important measures. Coal-fired power plant flexibility includes the ability of the unit to respond to changes in load commands. For the unit to respond quickly to load commands, rapidly and accurately adjusting the amount of air and pulverized coal entering the furnace is crucial. Achieving rapid and accurate adjustment relies on regulating dampers with good regulating characteristics. The coal mill inlet is equipped with a hot air regulating damper and a flow measurement device. When the hot air regulating damper is adjusted to more than 60% opening, it almost only changes the hot air flow direction and has very little effect on flow regulation (flow change rate <10%). The change in hot air flow direction is also not conducive to the stable measurement of the flow measurement device, ultimately causing the hot air regulating damper to fail to enter automatic operation. In addition, when the coal-fired power unit receives a load increase command, it usually first increases the opening of the hot air regulating damper and then increases the amount of coal in the coal mill. Because the regulating characteristics of the hot air regulating damper are poor and the resistance of the coal mill increases significantly after the amount of coal is increased, the coal output of the coal mill will actually decrease. This is not conducive to the unit's rapid response to the load command and will also cause the main steam temperature and pressure of the boiler to fluctuate more, which in turn causes fatigue damage to the metal of the boiler water-cooled wall. Summary of the Invention

[0004] In order to improve the adjustment characteristics of commonly used damper dampers, the present invention provides an eccentrically adjustable damper structure.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0006] An eccentrically adjustable damper structure includes a frame and a baffle blade mounted on the inner side of the frame via a drive shaft. At least one eccentric baffle is added to the baffle blade. The eccentric baffle and the center plane of the baffle blade are parallel to each other, and the eccentric baffle and the baffle blade are connected by at least two stiffeners. Neither the eccentric baffle nor the stiffeners exceed the imaginary cylinder formed by the drive shaft driving the baffle blade to rotate.

[0007] The applicant discovered through research that by connecting an eccentric baffle to the side of the baffle blade with a stiffener, and ensuring that neither the eccentric baffle nor the stiffener exceeds the imaginary cylinder formed by the drive shaft driving the baffle blade to rotate, the rotation control of the baffle blade is not affected, and the sensitivity of flow regulation is significantly improved. Even when the opening of the baffle blade reaches more than 60%, the effect on flow regulation is very large, with a flow change rate of about 30%. It can respond to load commands instantaneously and solve a series of problems caused by the poor regulation characteristics of the hot air regulating damper.

[0008] Existing baffle gates exhibit significant flow rate changes, sometimes abruptly, when adjusting the opening from 0 to 60%, making precise control difficult. Furthermore, adjustments above 60% opening primarily alter the hot air direction with minimal impact on flow rate; the flow rate change rate is less than 10% when adjusting from 60% to 100%. This application, however, significantly improves flow rate regulation performance through a redesigned baffle blade structure. The flow rate changes uniformly from 0 to 100% without abrupt changes, significantly enhancing flow control accuracy. Moreover, the flow rate change rate remains around 30% when adjusting from 60% to 100%, further improving the controllability of flow rate regulation.

[0009] The center surface of the aforementioned baffle blade refers to the surface located at (or past) the center of the thickness direction of the baffle blade.

[0010] The aforementioned "imaginary cylinder formed by the rotation of the baffle blade driven by the drive shaft" refers to the spatial geometry formed by the trajectory of the baffle blade rotating once.

[0011] The aforementioned "eccentric baffle and stiffener do not exceed the imaginary cylinder formed by the rotation of the drive shaft drive baffle blade" means that the eccentric baffle and stiffener are located inside and / or on the imaginary cylinder formed by the rotation of the drive shaft drive baffle blade.

[0012] When a frame contains multiple baffle blades, they are connected externally via a linkage mechanism to operate synchronously. This application does not make any special improvements to the structure of the linkage mechanism or its connection method with the drive shaft, motor, etc., and existing mature technologies or product manuals can be referred to, so it will not be described in detail here.

[0013] To further improve the sensitivity of flow regulation, two eccentric baffles are installed on each baffle blade, with the two eccentric baffles distributed on both sides of the baffle blade. More preferably, the two eccentric baffles are identical in shape and size, and symmetrically distributed on both sides of the baffle blade. This ensures that the flow rate can be responsively adjusted even when the baffle blade opening reaches 60% or more.

[0014] In one specific implementation, both the baffle blade and the eccentric baffle are rectangular (including two short sides and two long sides). The two short sides of the baffle blade are the mounting ends, and the drive shaft is located at or extends from the mounting ends.

[0015] For ease of installation and control, the length directions of the baffle blades and the eccentric baffles are parallel to each other, and the width directions are also parallel to each other.

[0016] To ensure effective flow regulation and smooth operation, the length of the eccentric baffle is the same as the length of the baffle blade and they are aligned (i.e., the two ends of the eccentric baffle and the baffle blade are aligned along their length). The width of the eccentric baffle is smaller than the width of the baffle blade.

[0017] To improve the balance and controllability of flow regulation, the center line of the eccentric baffle's vertical projection on the baffle blade overlaps with the center line of the baffle blade.

[0018] To balance the sensitivity and smoothness of flow regulation, a further optimization is made where the two long sides of the eccentric baffle fall on the cylindrical surface of an imaginary cylinder. This imaginary cylinder is the spatial geometry enclosed by the long side trajectories of the baffle blades as they rotate one revolution.

[0019] To further improve the damper's regulating characteristics, preferably, when there are two or more baffle blades on the inner side of the frame, the rotation directions of each pair of adjacent baffle blades are opposite (i.e., one rotates clockwise and the other rotates counterclockwise). This can further improve the sensitivity of flow regulation.

[0020] To meet general operating requirements and facilitate control, a rectangular frame structure is preferred, with 2-4 baffle blades installed inside. Of course, for special operating conditions, the frame shape can be modified and baffle blades can be added as needed.

[0021] To further improve the sensitivity of flow regulation, the distance between the eccentric baffle and the center surface of the baffle blade is optimized to be 1 / 4 to 1 / 3 of the width of the baffle blade. This allows for more precise and sensitive flow control.

[0022] The aforementioned "distance between the eccentric baffle and the center surface of the baffle blade" refers to the distance between the side of the eccentric baffle facing the baffle blade and the center surface of the baffle blade.

[0023] To improve structural reliability, preferably, when the baffle blades are fully open, the stiffeners are perpendicular to the flow section of the frame. This ensures both structural strength and the smoothness of flow regulation.

[0024] During operation, when the baffle blades are fully open, they are perpendicular to the flow section of the frame; when the baffle blades are fully closed, they are parallel to the flow section of the frame, covering the flow section and stopping the flow.

[0025] The flow section of the frame in this application refers to the cross-section through which gas flows inside the frame during operation. The flow section of the frame is perpendicular to the frame's axis.

[0026] Further optimization involves connecting each eccentric baffle and baffle blade with 4-8 stiffening plates.

[0027] Any techniques not mentioned or specifically described in this invention are based on existing technologies.

[0028] The eccentrically adjustable damper structure of this invention connects an eccentric baffle to the side of the baffle blade via stiffeners. Neither the eccentric baffle nor the stiffeners exceed the imaginary cylinder formed by the drive shaft rotating the baffle blade. This design does not affect the rotation control of the baffle blade and significantly improves the sensitivity of flow regulation. Even when the baffle blade opening reaches 60% or more, it can still achieve sensitive flow regulation and instantaneously respond to load commands, solving a series of problems caused by poor adjustment characteristics of hot air regulating dampers. The structure is simple, the effect is significant, it is highly practical, and it is easy to promote. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of the baffle blade of the present invention;

[0030] Figure 2 for Figure 1 The left view;

[0031] Figure 3 for Figure 1 A three-dimensional image;

[0032] Figure 4 This is a front view (single page) of the eccentrically adjustable damper structure of the present invention;

[0033] Figure 5 for Figure 4 The left view;

[0034] Figure 6 for Figure 4 A top view (perspective);

[0035] Figure 7 This is a front view of the eccentrically adjustable damper structure of the present invention (2 pages - double-leaf type);

[0036] Figure 8 for Figure 7 The left view;

[0037] Figure 9 for Figure 7 A top view (perspective);

[0038] Figure 10 for Figure 7 3D Figure 1 ;

[0039] Figure 11 for Figure 7 3D Figure 2 ;

[0040] Figure 12 This is a comparison diagram of the adjustment of the eccentrically adjustable damper (b1-b2) of this invention and the conventional baffle door (a1-a2);

[0041] Figure 13 This is a front view of the eccentrically adjustable damper structure of the present invention (3 pages - double-leaf type);

[0042] Figure 14 for Figure 13 The left view;

[0043] Figure 15 for Figure 13 A top view (perspective);

[0044] Figure 16 for Figure 13 3D Figure 1 ;

[0045] Figure 17 for Figure 13 3D Figure 2 ;

[0046] Figure 18 This is a front view of the eccentrically adjustable damper structure of the present invention (4 pages - double-leaf type);

[0047] Figure 19 for Figure 18 The left view;

[0048] Figure 20 for Figure 18 A top view (perspective);

[0049] In the diagram, 1 is the frame, 2 is the baffle blade, 3 is the eccentric baffle, 4 is the stiffener, 5 is the drive shaft, and 6 is the linkage mechanism. Detailed Implementation

[0050] To better understand the present invention, the following embodiments further illustrate the content of the present invention, but the content of the present invention is not limited to the following embodiments.

[0051] Example 1

[0052] An eccentrically adjustable damper structure includes a frame and a baffle blade mounted on the inner side of the frame via a drive shaft. At least one eccentric baffle is added to the baffle blade. The eccentric baffle and the center plane of the baffle blade are parallel to each other, and the eccentric baffle and the baffle blade are connected by at least two stiffeners. Neither the eccentric baffle nor the stiffeners exceed the imaginary cylinder formed by the drive shaft driving the baffle blade to rotate.

[0053] Verification has shown that by connecting an eccentric baffle to the side of the baffle blade with a stiffener, and ensuring that neither the eccentric baffle nor the stiffener exceeds the imaginary cylinder formed by the drive shaft driving the baffle blade to rotate, the rotation control of the baffle blade is not affected, and the sensitivity of flow regulation is significantly improved. Even when the opening of the baffle blade reaches more than 60%, the flow regulation effect (flow rate of change) can reach about 30%, which can respond to load commands instantly and solve a series of problems caused by the poor regulation characteristics of the hot air regulating damper.

[0054] Example 2

[0055] Based on Example 1, the following improvements were made: To further improve the sensitivity of flow rate regulation, such as... Figure 1-3 As shown, each baffle blade is equipped with two eccentric baffles, which are distributed on both sides of the baffle blade. The two eccentric baffles are identical in shape and size, and are symmetrically distributed on both sides of the baffle blade. In this way, even if the opening of the baffle blade reaches more than 60%, the flow rate can be sensitively adjusted.

[0056] Example 3

[0057] Based on Example 2, the following improvements were made: Figure 1-3 As shown, both the baffle blade and the eccentric baffle are rectangular. To ensure the flow regulation effect and smoothness, the length of the eccentric baffle is the same as the length of the baffle blade and they are aligned at the same ends. The width of the eccentric baffle is smaller than the width of the baffle blade, and the two long sides of the eccentric baffle fall on the cylindrical surface of an imaginary cylinder.

[0058] Example 4

[0059] Based on Example 3, the following improvements were made: the frame has a rectangular frame structure, and the distance between the eccentric baffle and the center surface of the baffle blade is 1 / 3 of the width of the baffle blade (verified, it can also be 1 / 4, etc.); each eccentric baffle and baffle blade are connected by 6 stiffeners (verified, it can also be 4, 5, 7, etc.). When the baffle blade is in the fully open state, the stiffeners are perpendicular to the flow section of the frame; when the baffle blade is in the fully closed state, the baffle blade is parallel to the flow section of the frame, covering the flow section of the frame and cutting off the flow. This ensures both structural strength and does not affect flow regulation, ensuring the sensitivity of flow regulation.

[0060] like Figure 4-6 As shown, in this example, a baffle blade is installed inside the frame. The end of the drive shaft extends out of the frame and is driven to rotate by a motor, thereby rotating the baffle blade. When used on the inlet cold primary air duct of a medium-speed coal mill in a coal-fired power plant, the rotation of the baffle blade is flexible and controllable (0-90°, corresponding to a baffle blade opening of 0-100%). Compared with conventional baffle gates, the air resistance is the same when fully open (100% opening) and the tightness is similar when fully closed (0 opening). However, the opening of the baffle blade in this invention reaches more than 60%, and the adjustment linearity is significantly better than that of conventional baffle gates, with a flow regulation effect (flow rate change) of about 32%.

[0061] Example 5

[0062] Unlike Example 4, as follows: Figure 7-11 As shown in this example, two baffle blades are installed inside the frame. The ends of each drive shaft protrude from the frame and are connected by a linkage mechanism. The linkage mechanism is driven by a motor, which in turn drives the two baffle blades to rotate synchronously. The rotation directions of the two baffle blades are opposite. When used on the inlet hot primary air duct of a medium-speed coal mill in a coal-fired power plant, the rotation of the baffle blades is flexible and controllable (0-90°, corresponding to a baffle blade opening of 0-100%). Compared with conventional baffle gates, the air resistance is the same when fully open (100% opening) and the tightness is similar when fully closed (0 opening). However, the opening of the baffle blades in this invention reaches more than 60%, and the adjustment linearity is significantly better than that of conventional baffle gates. The flow regulation effect (flow rate change) reaches about 30%.

[0063] like Figure 12 As shown, if a conventional baffle gate is used, under the same working conditions, the opening of the baffle blade reaches more than 60%, and the effect on flow regulation (flow change rate) is less than 8%.

[0064] Example 6

[0065] Unlike Example 4, as follows: Figure 13-17As shown, in this example, three baffle blades are installed within the frame. The ends of each drive shaft extend out of the frame and are connected via a linkage mechanism. The linkage mechanism is driven by a motor, which in turn drives the three baffle blades to rotate synchronously. The rotation directions of any two adjacent baffle blades are opposite (from left to right, they are counterclockwise, clockwise, and counterclockwise, or clockwise, counterclockwise, and clockwise). When used on the inlet hot primary air duct of a medium-speed coal mill in a coal-fired power plant, the rotation of the baffle blades is flexible and controllable (0–90°, corresponding to a baffle blade opening of 0–100%). Compared with conventional baffle gates, the air resistance is consistent in the fully open state (100% opening) and the tightness is similar in the fully closed state (0% opening). However, the opening of the baffle blades in this invention reaches more than 60%, and the adjustment linearity is significantly better than that of conventional baffle gates, with a flow rate regulation effect (flow rate change) of about 30%.

[0066] Example 7

[0067] Unlike Example 4, as follows: Figure 18-20 As shown, in this example, four baffle blades are installed inside the frame. The ends of each drive shaft protrude from the frame and are connected by two sets of linkage mechanisms. The linkage mechanisms are driven by a motor, which in turn drives the four baffle blades to rotate synchronously. The rotation directions of any two adjacent baffle blades are opposite (from left to right, they are counterclockwise, clockwise, counterclockwise, and clockwise, or clockwise, counterclockwise, clockwise, and counterclockwise). When used on the inlet hot primary air duct of a medium-speed coal mill in a coal-fired power plant, the rotation of the baffle blades is flexible and controllable (0-90°, corresponding to a baffle blade opening of 0-100%). Compared with conventional baffle gates, the air resistance is the same when fully open (100% opening) and the tightness is close when fully closed (0 opening). However, the opening of the baffle blades in this invention reaches more than 60%, and the adjustment linearity is significantly better than that of conventional baffle gates. The flow regulation effect (flow change rate) reaches about 28%.

[0068] The eccentrically adjustable damper structures described above connect eccentric baffles to the sides of the baffle blades via stiffeners. Neither the eccentric baffle nor the stiffeners exceed the imaginary cylinder formed by the drive shaft rotating the baffle blades. This design does not affect the rotation control of the baffle blades and significantly improves the sensitivity of flow regulation. Even when the baffle blade opening reaches 60% or more, it can still achieve sensitive flow regulation and instantaneously respond to load commands, solving a series of problems caused by poor regulation characteristics of hot air dampers. The structure is simple, the effect is significant, it is highly practical, and it is easy to promote.

Claims

1. An eccentrically adjustable damper structure, comprising a frame and baffle blades mounted inside the frame via a drive shaft, characterized in that: Each baffle blade is equipped with two eccentric baffles, which are distributed on both sides of the baffle blade. The center surfaces of the eccentric baffle and the baffle blade are parallel to each other, and the eccentric baffle and the baffle blade are connected by at least two stiffeners; neither the eccentric baffle nor the stiffeners exceed the imaginary cylinder formed by the drive shaft driving the baffle blade to rotate. The two eccentric baffles are identical in shape and size, and are symmetrically distributed on both sides of the baffle blades. Both the baffle blades and the eccentric baffle are rectangular; When there are two or more baffle blades on the inner side of the frame, the rotation directions of each pair of adjacent baffle blades are opposite. Even when the baffle blades are open to more than 60%, they can respond to load commands instantly.

2. The eccentrically adjustable damper structure according to claim 1, characterized in that: The length directions of the baffle blade and the eccentric baffle are parallel to each other. The length of the eccentric baffle is the same as the length of the baffle blade and they are aligned at the same end. The width of the eccentric baffle is smaller than the width of the baffle blade.

3. The eccentrically adjustable damper structure according to claim 1 or 2, characterized in that: The center line of the vertical projection of the eccentric baffle onto the baffle blade overlaps with the center line of the baffle blade.

4. The eccentrically adjustable damper structure according to claim 1 or 2, characterized in that: The two long sides of the eccentric baffle fall on the cylindrical surface of the imaginary cylinder.

5. The eccentrically adjustable damper structure according to claim 1 or 2, characterized in that: The frame has a rectangular border structure, and 2-4 baffle blades are installed inside the frame.

6. The eccentrically adjustable damper structure according to claim 1 or 2, characterized in that: The distance between the eccentric baffle and the center surface of the baffle blade is 1 / 4 to 1 / 3 of the width of the baffle blade.

7. The eccentrically adjustable damper structure according to claim 1 or 2, characterized in that: When the baffle blades are fully open, the stiffeners are perpendicular to the flow section of the frame; each eccentric baffle is connected to the baffle blades by 4-8 stiffeners.

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