A suspension type steel inner cylinder chimney damping device
By combining dampers and shape memory alloy materials in a suspended steel inner cylinder chimney, the problem of poor seismic performance in traditional devices is solved, achieving more effective vibration reduction and structural protection.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHINA POWER ENG CONSULTING GRP CORP EAST CHINA ELECTRIC POWER DESIGN INST
- Filing Date
- 2025-08-20
- Publication Date
- 2026-07-14
AI Technical Summary
Traditional suspended steel inner cylinder chimney vibration damping devices suffer from problems such as high local stress, poor seismic performance, and easy deformation of the steel cylinder, and existing anti-sway devices cannot effectively improve the vibration damping effect.
A vibration damping device combining a damper and shape memory alloy material is used to control the vibration of the inner and outer cylinders through frictional energy dissipation and relative displacement. The superelasticity of the shape memory alloy is used to enhance the self-resetting ability, and vibration damping is achieved by combining the principle of a tuned mass damper.
It improves the vibration reduction effect of the chimney, reduces the bottom shear force and top acceleration under earthquake or wind vibration, prevents chimney damage, reduces residual deformation, and enhances seismic performance.
Smart Images
Figure CN224495985U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of mechanical structure technology, and more specifically to a vibration reduction technology for a suspended steel inner cylinder chimney. Background Technology
[0002] The descriptions in this section are intended only to provide background information for the implementation of this application and should not be construed as an admission or implication that they constitute prior art.
[0003] As a crucial structure in power plants, chimneys have seen increasing heights in recent years, reaching as high as 200-300 meters, due to the growing installed capacity of coal-fired power plants. With rising international environmental standards and increased public awareness of environmental protection, newly built thermal power plants must implement flue gas desulfurization (FGD). Currently, wet FGD systems for coal-fired power plants in China are being put into operation. The "Technical Standard for Chimney Engineering" points out that chimneys without heating devices suffer from severe acid condensation due to the lower temperature of the wet flue gas. The preferred solution for corrosion prevention in such chimneys is a steel inner-cylinder sleeve chimney, which separates the load-bearing reinforced concrete outer cylinder from the inner flue gas cylinder, preventing the outer cylinder's structural components from contacting the highly corrosive flue gas.
[0004] Traditional self-supporting steel inner cylinders, primarily subjected to compression, are prone to buckling stability issues. Suspended inner cylinders, suspended on a platform, primarily bear tension, avoiding localized instability. Furthermore, self-supporting steel inner cylinders are more susceptible to corrosion in compressive stress areas, while localized corrosion has a limited impact on the tensile load-bearing capacity of the inner cylinder. Due to their excellent economic efficiency and load-bearing performance, suspended steel inner cylinder chimneys are gradually gaining acceptance from owners and design firms.
[0005] Traditional suspended steel inner cylinder chimneys use anti-sway devices between the inner and outer cylinders to limit the horizontal swaying of the inner cylinder. However, this method has problems such as high local stress, poor seismic performance, and easy deformation of the steel cylinder.
[0006] On the other hand, shape memory alloy (SMA) materials are being further developed, possessing both strength and super elasticity. They demonstrate advantages in reducing residual deformation, improving structural self-resetting ability and durability, making them suitable for the needs of industrial structures. Summary of the Invention
[0007] The purpose of this utility model is to provide a suspended steel inner cylinder chimney vibration damping device to improve the vibration damping effect of the chimney.
[0008] This application discloses a suspended steel inner cylinder chimney vibration damping device, including an outer cylinder platform beam, a damper, a vertical slide groove, and a steel inner cylinder ring beam: the outer cylinder platform beam is erected on the inner side of the outer cylinder of the chimney, the vertical slide groove is fixed on the inner side of the outer cylinder platform beam, and the steel inner cylinder ring beam is erected on the outer side of the steel inner cylinder of the chimney.
[0009] The damper is disposed between the vertical slide groove and the steel inner cylinder ring beam. One end of the damper is fixed to the steel inner cylinder ring beam, and the other end of the damper is suspended in the vertical slide groove, and can slide up and down along the vertical slide groove.
[0010] The damper includes a cover plate and a shock-absorbing component, which dampes vibrations through friction plates.
[0011] In a preferred embodiment, the damper includes a cover plate and a shock-absorbing component, wherein the shock-absorbing component provides shock absorption via friction pads, specifically including:
[0012] The damper includes upper and lower cover plates and one or more shock-absorbing components;
[0013] The shock-absorbing component includes bolts, nuts, friction plates, clamping blocks, and support connectors. The bolts pass through from top to bottom and cooperate with the nuts to fix the shock-absorbing component to the cover plate. The friction plates, clamping blocks, and support connectors are located between the cover plates. The clamping blocks are located in the middle of the shock-absorbing component. Multiple friction plates are connected to the cover plate and the clamping blocks in an inclined manner. The support connectors support the cover plate from top to bottom.
[0014] In a preferred embodiment, the damping component further includes a pad.
[0015] In a preferred embodiment, the support connector is a hollow structure that fits over the clamping block and the friction plate.
[0016] In a preferred embodiment, the cover plate is provided with a U-shaped groove to facilitate the movement and fixing of bolts and nuts.
[0017] In a preferred embodiment, the damper includes two damping components. One damping component has an outer cylinder connector as its supporting connection, which laterally connects the vertical slide and the damping component. The other damping component has an inner cylinder connector as its supporting connection, which laterally connects the steel inner cylinder ring beam and the damping component.
[0018] In a preferred embodiment, the friction pad is a conical structure, a sheet structure, or a strip structure.
[0019] In a preferred embodiment, in a damping component, there are two friction pads, one above and one below the clamping block.
[0020] In a preferred embodiment, a damping member comprises four friction pads, two above and two below the clamping block.
[0021] In a preferred embodiment, the main body of the support connector has a square structure.
[0022] In a preferred embodiment, one end of the damper is fixed to the steel inner cylinder ring beam by welding.
[0023] In a preferred embodiment, the damping device employs a tuned mass damper.
[0024] In a preferred embodiment, the damping device employs a shape memory alloy friction damper.
[0025] In a preferred embodiment, the damper is made of shape memory alloy.
[0026] In a preferred embodiment, the bolts in the damper are shape memory alloy bolts.
[0027] In a preferred embodiment, the steel inner cylinder ring beam surrounds the outer side of the chimney's steel inner cylinder.
[0028] In a preferred embodiment, the vertical chute is fixedly connected to the outer cylinder platform beam by rebar, bolts, or anchors.
[0029] The main differences and effects of this utility model embodiment compared with the prior art are as follows:
[0030] Dampers can dissipate energy through friction, allowing for a suitable relative displacement between the inner and outer cylinders, thus improving the chimney's vibration reduction effect. Under minor earthquakes and wind-induced vibrations, they can provide additional stiffness to the main structure and control the swaying of the inner cylinder. Under major earthquakes, they dissipate energy through sliding friction, protecting the main structure.
[0031] Furthermore, its small size does not affect the normal use of the internal space of the chimney, and can reduce the bottom shear force and top acceleration of the outer cylinder under the action of earthquake or wind vibration, prevent chimney damage, reduce residual deformation, reduce losses, and effectively solve the problems of traditional anti-sway devices.
[0032] Furthermore, shape memory alloys can be used to improve shock absorption performance through the material's super elasticity.
[0033] It should be understood that, within the scope of this utility model, the above-described technical features of this utility model and the technical features specifically described below (such as in the embodiments) can be combined with each other to form new or preferred technical solutions. Due to space limitations, they will not be described in detail here. Attached Figure Description
[0034] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0035] Figure 1 This is a top view schematic diagram of a shock-absorbing device according to one embodiment of this application.
[0036] Figure 2 This is a schematic front view of a shock-absorbing device according to one embodiment of this application.
[0037] The labels in each of the attached figures are as follows:
[0038] 1-Outer cylinder platform beam;
[0039] 2-Damper;
[0040] 3-Vertical groove;
[0041] 4-Steel inner cylinder ring beam;
[0042] 5- Bolts;
[0043] 6-nut;
[0044] 7-Cover plate;
[0045] 8-Friction pad;
[0046] 9-Outer cylinder connector;
[0047] 10-Inner cylinder connector;
[0048] 11-Damping components;
[0049] 12-Clamping block. Detailed Implementation
[0050] In the following description, many technical details are presented to help the reader better understand this application. However, those skilled in the art will understand that the technical solutions claimed in this application can be implemented even without these technical details and various variations and modifications based on the following embodiments.
[0051] Explanation of some concepts
[0052] Dampers: A device that reduces the dynamic response of a structure under dynamic loads (such as wind vibration, earthquake, and impact loads) by consuming or absorbing the vibration energy of the structure.
[0053] Shape memory alloys (SMA, Friction Damper): A class of smart metallic materials with shape memory effect and superelasticity, the most commonly used being nickel-titanium (Ni-Ti) alloys. Their core characteristic is the ability to undergo reversible shape changes under temperature or stress, combining the strength of metals with "smart response" capabilities.
[0054] Tuned Mass Damper (TMD): A dynamic vibration-absorbing device that achieves vibration control through "frequency tuning". It consists of a subsystem of a mass block, a spring (or elastic element) and a damping element. By matching the vibration frequency with the main structure, it absorbs structural energy to reduce vibration.
[0055] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.
[0056] One embodiment of this application relates to a suspension-type steel inner cylinder chimney vibration damping device, the structure of which is as follows: Figure 1 and Figure 2 As shown, the device includes an outer cylinder platform beam 1, a damper 2, a vertical chute 3, and a steel inner cylinder ring beam 4. The outer cylinder platform beam 1 is mounted on the inner side of the outer cylinder of the chimney, the vertical chute 3 is fixed to the inner side of the outer cylinder platform beam 1, and the steel inner cylinder ring beam 4 is mounted on the outer side of the steel inner cylinder of the chimney. The outer cylinder (not shown in the figure) is located to the left of the outer cylinder platform beam 1, and the inner cylinder is located to the right of the steel inner cylinder ring beam 4.
[0057] The damper 2 is installed between the vertical slide 3 and the steel inner cylinder ring beam 4. One end of the damper 2 is fixed to the steel inner cylinder ring beam 4, and the other end of the damper 2 is suspended in the vertical slide 3, and can slide up and down along the vertical slide 3.
[0058] The damper 2 includes a cover plate 7 and a damping component 11, which damps vibrations through friction plates 8.
[0059] In one embodiment, the damper 2 includes a cover plate 7 and a shock-absorbing component 11, wherein the shock-absorbing component 11 provides shock absorption through friction pads 8, specifically including:
[0060] like Figure 2 As shown, the damper 2 includes upper and lower cover plates 7 and one or more damping components 11;
[0061] The damping component 11 includes bolts 5, nuts 6, friction plates 8, clamping blocks 12, and supporting connectors. Bolts 5 pass through from top to bottom and cooperate with nuts 6 to fix the damping component 11 to the cover plate 7. Between the cover plates 7 are the friction plates 8, clamping blocks 12, and supporting connectors. The clamping blocks 12 are located in the middle of the damping component 11. Multiple friction plates 8 are connected to the cover plate 7 and the clamping blocks 12 in an inclined manner. The supporting connectors support the cover plate 7 from top to bottom.
[0062] In one embodiment, the shock-absorbing component 11 further includes a pad.
[0063] In one embodiment, the support connector is a hollow structure that fits over the clamping block 12 and the friction plate 8.
[0064] In one embodiment, the cover plate 7 is provided with a U-shaped groove to facilitate the movement and fixing of bolts 5 and nuts 6.
[0065] In one embodiment, the damper 2 includes two damping components 11. The supporting connector of one damping component 11 is an outer cylinder connector 9, which is laterally connected to the vertical slide 3 and the damping component 11. The supporting connector of the other damping component 11 is an inner cylinder connector 10, which is laterally connected to the steel inner cylinder ring beam 4 and the damping component 11.
[0066] In one embodiment, the friction plate 8 has a conical or strip-shaped structure.
[0067] In one embodiment, in a shock-absorbing component, there are two friction pads, one above and one below the clamping block.
[0068] In one embodiment, a shock-absorbing component has a total of four friction pads, two above and two below the clamping block.
[0069] In one embodiment, the main body of the supporting connector is a square structure.
[0070] In one embodiment, one end of the damper 2 is fixed to the steel inner cylinder ring beam 4 by welding.
[0071] In one embodiment, the damping device employs a tuned mass damper (TMD damper).
[0072] In one embodiment, the damping device employs a shape memory alloy friction damper (SMA friction damper).
[0073] In one embodiment, the damping device employs a shape memory alloy friction damper (SMA friction damper) based on the TMD principle.
[0074] In one embodiment, the damper 2 is made of shape memory alloy (SMA).
[0075] In one embodiment, the bolt 5 in the damper 2 is a shape memory alloy bolt (SMA bolt).
[0076] In one embodiment, the steel inner cylinder ring beam 4 surrounds the outer side of the chimney's steel inner cylinder.
[0077] In one embodiment, the vertical chute 3 is fixedly connected to the outer cylinder platform beam 1 by rebar, bolts 5, or anchors.
[0078] This invention combines a damper 2 (preferably an SMA friction damper) with a suspension structure, using the inner steel cylinder as an inertial mass block. The damper 2 connects the inner and outer steel cylinders, controlling certain vibration modes of the structure based on the TMD damping principle. Under dynamic loads, relative displacement occurs between the inner and outer steel cylinders. When their natural frequencies reach a certain relationship, the inner steel cylinder applies a reverse force to the outer cylinder, and the vibration of the outer cylinder is controlled by the frictional energy dissipation of the damper 2. Furthermore, the superelasticity of the SMA material enhances the self-resetting ability of the inner steel cylinder, reducing residual displacement. The damper 2 of this invention can accommodate relative motion in multiple directions, especially for resisting horizontal oscillations in chimneys. This damping technology eliminates the need for additional suspension mass, avoiding excessive additional second-order effects on the structure. Simultaneously, the damper 2 is small in size, facilitating manufacturing and installation without affecting the normal use of the chimney's internal space. It overcomes the problems of high local stress, poor seismic performance, and easy deformation of the steel cylinder in traditional anti-sway devices, effectively improving the damping effect on chimneys.
[0079] It should be noted that in the claims and specification of this patent, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one" does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0080] All documents mentioned in this invention are incorporated herein by reference as if each document were individually incorporated by reference. Furthermore, it should be understood that after reading the foregoing teachings of this invention, those skilled in the art can make various alterations or modifications to this invention, and these equivalent forms also fall within the scope defined by the appended claims.
Claims
1. A suspension-type steel inner cylinder chimney vibration damping device, characterized in that, Includes an outer cylinder platform beam (1), a damper (2), a vertical chute (3), and a steel inner cylinder ring beam (4): the outer cylinder platform beam (1) is erected on the inner side of the outer cylinder of the chimney, the vertical chute (3) is fixed on the inner side of the outer cylinder platform beam (1), and the steel inner cylinder ring beam (4) is erected on the outer side of the steel inner cylinder of the chimney; The damper (2) is disposed between the vertical slide groove (3) and the steel inner cylinder ring beam (4). One end of the damper (2) is fixed to the steel inner cylinder ring beam (4), and the other end of the damper (2) is suspended in the vertical slide groove (3) and can slide up and down along the vertical slide groove (3). The damper (2) includes a cover plate (7) and a shock-absorbing component (11), which provides shock absorption through friction plates.
2. The suspension-type steel inner cylinder chimney vibration damping device according to claim 1, characterized in that, The damper (2) includes a cover plate (7) and a shock-absorbing component (11), wherein the shock-absorbing component (11) provides shock absorption through friction plates, specifically including: The damper (2) includes two cover plates (7) and one or more damping components (11); The shock-absorbing component (11) includes a bolt (5), a nut (6), friction plates, a clamping block (12), and a support connector. The bolt (5) passes through from top to bottom and cooperates with the nut (6) to fix the shock-absorbing component (11) onto the cover plate (7). The cover plate (7) is composed of friction plates, clamping blocks (12), and support connectors. The clamping block (12) is located in the middle of the shock-absorbing component (11). Multiple friction plates are connected to the cover plate (7) and the clamping block (12) in an inclined manner. The support connectors support the cover plate (7) from top to bottom.
3. The suspended steel inner cylinder chimney vibration damping device according to claim 2, characterized in that, The damper (2) includes two damping components (11). The supporting connector of one damping component (11) is an outer cylinder connector (9), which is laterally connected to the vertical slide (3) and the damping component (11). The supporting connector of the other damping component (11) is an inner cylinder connector (1O), which is laterally connected to the steel inner cylinder ring beam (4) and the damping component (11).
4. The suspended steel inner cylinder chimney vibration damping device according to claim 2, characterized in that, The friction pad has a conical structure, a sheet-like structure, or a strip-like structure.
5. The suspended steel inner cylinder chimney vibration damping device according to claim 2, characterized in that, The main body of the support connector is a square structure.
6. The suspension-type steel inner cylinder chimney vibration damping device according to claim 1, characterized in that, One end of the damper (2) is fixed to the steel inner cylinder ring beam (4) by welding.
7. The suspension-type steel inner cylinder chimney vibration damping device according to claim 1, characterized in that, The shock absorption device employs a tuned mass damper.
8. The suspension-type steel inner cylinder chimney vibration damping device according to claim 1, characterized in that, The damper (2) is made of shape memory alloy.
9. The suspension-type steel inner cylinder chimney vibration damping device according to claim 1, characterized in that, The steel inner cylinder ring beam (4) surrounds the outer side of the steel inner cylinder of the chimney.
10. The suspension-type steel inner cylinder chimney vibration damping device according to claim 1, characterized in that, The vertical chute (3) is fixedly connected to the outer cylinder platform beam (1) by rebar, bolts (5) or anchors.