A front wall vibration damping device for a w-flame boiler and a layout method thereof

Abstract

The application discloses a kind of W flame boiler front wall vibration damping device and a kind of W flame boiler front wall vibration damping device and its layout method, including hydraulic damper, multiple hydraulic dampers are arranged, and multiple hydraulic dampers two ends are respectively horizontally hinged in the vertical beam of front wall rigid beam below 1000mm place and the column outside boiler furnace wall.The hydraulic damper is installed between the front wall and the column outside the front wall in the application, under the impact of the negative pressure airflow fluctuation of W flame boiler flame on the membrane water wall, the membrane water wall is fixedly connected to the front wall, and the hydraulic buffer can play a damping effect on the front wall, thereby making the membrane water wall avoid being damaged under the impact of flame airflow, especially in the damage of weak place such as membrane water wall welding.

Description

Technical Field

[0001] This invention belongs to the technical field of water-cooled wall support equipment, and relates to a vibration damping device for the front wall of a W-flame boiler, as well as a method for arranging the vibration damping device for the front wall of a W-flame boiler. Background Technology

[0002] The function of the water-cooled walls in a W-flame boiler is to absorb the radiant heat from the high-temperature flames or flue gas in the furnace, generate steam or hot water inside the tubes, and reduce the temperature of the furnace walls to protect them.

[0003] The water-cooled walls of the W-flame boiler are membrane water-cooled walls. During use, the vibration amplitude caused by the fluctuation of negative pressure inside the furnace will cause damage to the water-cooled walls under long-term impact. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a vibration damping device for the front wall of a W-flame boiler and its installation method, so as to solve the technical problems existing in the prior art.

[0005] The technical solution adopted in this invention is as follows: A vibration damping device for the front wall of a W-flame boiler, comprising a hydraulic damper, wherein multiple hydraulic dampers are provided, and the two ends of the multiple hydraulic dampers are respectively horizontally hinged to a vertical beam 1000mm below the rigid beam of the front wall and to a column outside the boiler furnace wall.

[0006] Furthermore, the aforementioned hydraulic dampers employ five of them.

[0007] Furthermore, the aforementioned hydraulic damper is a hydraulic damper with a rated load greater than 50KN, which meets the requirements of boiler hot displacement, low-speed travel resistance should not exceed 1% of the rated load, locking speed should be in the range of 125mm / min to 360mm / min, and the speed after locking should be in the range of 12mm / min to 125mm / min under the rated load.

[0008] Furthermore, one end of the aforementioned hydraulic damper is fixedly connected to an extension rod, and the other end is hinged to an upper sliding plate. The extension rod is hinged to a vertical beam. The bottom ends of the upper sliding plate are fixedly connected to two lower sliding plates via shear pins. The two lower sliding plates are fixedly connected to two H-beams, and the ends of the two H-beams on the same side are fixedly connected to the ends of a supporting crossbeam. The middle of the supporting crossbeam is fixedly connected to a column. Considering the extreme case of instantaneous deflagration in the furnace, causing the damper to jam and become a rigid component, this shear pin is installed to protect the boiler steel frame. Simultaneously, since the load direction on the furnace wall is often not perpendicular to the furnace wall, the shear pin at the base of the damper also experiences eccentric loading. Without affecting the safety of the boiler steel frame, the initial maximum load of the shear pin (0.5 times the rated load of the damper) is increased to 0.7 times to ensure equipment reliability.

[0009] A method for arranging a vibration damping device for the front wall of a W-type flame boiler includes a fast Fourier transform wavelet analysis system for the vibration of the furnace wall under negative pressure. This system comprises five vibration sensors, a vibration displacement reference sensor, a multi-channel data acquisition unit, and a dedicated computer in the control room. The five vibration sensors are spaced apart on a rigid beam at an elevation of 51.5m on the front wall of the W-type flame boiler. The vibration displacement reference sensor is positioned at the dead point of the rigid beam. The six channels of the multi-channel data acquisition unit are connected to the five vibration sensors and the vibration displacement reference sensor via a preamplifier, receiving their vibration displacement signals while simultaneously transmitting them to the sensors. The device provides power; the network output port of the multi-channel data acquisition unit is connected to the network relay device, which is connected to the dedicated computer in the central control room. The dedicated computer in the central control room is used to perform fast Fourier transform wavelet analysis on the acquired sensor data, calculate vibration velocity and vibration acceleration, realize fast Fourier transform, and obtain the time-domain and frequency-domain characteristics of low-frequency small-amplitude vibration of the furnace wall; as well as the furnace wall vibration characteristic analysis coupled with furnace negative pressure fluctuations, accepting the real-time change value of furnace negative pressure and the time-domain and frequency-domain characteristics of low-frequency small-amplitude vibration of the furnace wall, realizing the correlation analysis between the furnace wall vibration characteristic value and the real-time change value of furnace negative pressure, and arranging hydraulic dampers according to the correlation analysis results.

[0010] Furthermore, the above correlation analysis method is as follows: along the furnace width direction, in the unit load rate range of 40% to 100%, the time domain and frequency domain characteristics of the low-frequency small amplitude vibration of the furnace wall are obtained at every 5% load rate interval. Combined with the annual average time proportion of each load rate of the unit, the damper is arranged at the point with the largest amplitude and the highest frequency. Considering the symmetry of the entire furnace, the damper should also be arranged symmetrically.

[0011] Furthermore, the aforementioned five vibration sensors are arranged with one on each side of the vertical center line of the front wall, one 5000mm to the left and one 12000mm to the left and one 12000mm to the right of the vertical center line.

[0012] Furthermore, the aforementioned multi-channel data acquisition unit is housed in a dustproof and waterproof box located at the vertical centerline of both side walls.

[0013] The beneficial effects of this invention are as follows: Compared with the prior art, this invention installs multiple hydraulic dampers between the front wall and the columns outside the front wall. Under the impact of the negative pressure airflow fluctuations of the flame in the W-flame boiler on the membrane water-cooled wall, the membrane water-cooled wall, fixedly connected to the front wall, can provide shock absorption and buffering for the front wall. This reduces the probability of damage to the membrane water-cooled wall under the impact of the flame airflow, especially to weak points such as welds in the membrane water-cooled wall. The arrangement structure and parameter settings of the hydraulic dampers in this invention are obtained based on fast Fourier transform wavelet analysis of the furnace wall vibration coupled with the negative pressure fluctuations in the furnace, resulting in a more precise and reliable arrangement and a more significant buffering effect. Attached Figure Description

[0014] Figure 1 This is a top view schematic diagram of the installation structure of the present invention;

[0015] Figure 2 This is a schematic diagram of the left-side view structure of the present invention;

[0016] Figure 3 This is a schematic diagram of a fast Fourier transform wavelet analysis system for coupled furnace negative pressure fluctuation and furnace wall vibration.

[0017] Figure 4 This is a side view schematic diagram of the damper structure;

[0018] Figure 5 This is a top view of the damper structure.

[0019] Figure 6 yes Figure 5 View from A in the middle. Detailed Implementation

[0020] The present invention will be further described below with reference to specific embodiments.

[0021] Example 1: As Figure 1-6As shown, a vibration damping device for the front wall of a W-flame boiler includes hydraulic dampers 7. Multiple hydraulic dampers 7 are provided, with both ends hinged to a vertical beam 8 located 1000mm below the rigid beam 6 of the front wall and to a column 9 outside the boiler wall. The column 9 is fixedly connected to a fixed frame outside the boiler wall. Preferably, there are five hydraulic dampers 7. The hydraulic dampers are rated with a load greater than 50KN, meeting the requirements for boiler hot displacement, low-speed travel resistance not exceeding 1% of the rated load, locking speed within the range of 125mm / min to 360mm / min, and post-locking speed within the range of 12mm / min to 125mm / min under the rated load. One end of each hydraulic damper 7 is fixedly connected to an extension rod 701, and the other end is hinged to a hinged double lug on an upper sliding plate 702. The extension rod 701 is hinged to the vertical beam 8. The bottom ends of the upper sliding plate 702 are fixedly connected to the two lower sliding plates 704 by shear pins 703. After the shear pins 703 pass through the upper sliding plate 702 and the lower sliding plate 704, they are locked with upper nuts 709 and lower thin nuts 708. The double nut locking limit is more reliable. The two lower sliding plates 704 are fixedly connected to the two H-beams 705 respectively. Reinforcing ribs 709 are provided between the two lower sliding plates 704 and the two H-beams 705 respectively, which can improve the connection between the two H-beams 705 and the two ends of the same side. The two ends of the two H-beams 705 are fixedly connected to the two ends of the support beam 706. The middle part of the support beam 706 is fixedly connected to the column 9. The installation of the shear pin is to take into account the extreme case of instantaneous combustion in the furnace, where the damper jams and becomes a rigid component. For the protection of the boiler steel frame, this shear pin is set. Meanwhile, since the load direction of the furnace wall is often not perpendicular to the furnace wall, and the shear pin at the root of the damper is also subject to eccentric loading, the initial maximum load of the shear pin, which was 0.5 times the rated load of the damper, is increased to 0.7 times without affecting the safety of the boiler steel frame, to ensure the reliability of the equipment. The vertical beam 8, the supporting beam 706 and the column 9 are H-shaped steel structures. A reinforcing plate 901 is installed in the middle of the supporting beam 706 directly opposite the column 9 to improve the rigidity and strength of the support.

[0022] Example 2: A method for arranging a vibration damping device for the front wall of a W-flame boiler, comprising a fast Fourier transform wavelet analysis system 1 for coupled furnace negative pressure wavelet furnace wall vibration. The system 1 includes five vibration sensors 2, a vibration displacement reference sensor 3, a multi-channel data acquisition unit 4, and a dedicated computer 5 in the control room. The five vibration sensors 2 are spaced apart on a rigid beam 6 at an elevation of 51.5m on the front wall of the W-flame boiler. The vibration displacement reference sensor 2 is positioned at the dead displacement point of the rigid beam 6. The multi-channel data acquisition unit 4 has two reserved channels, and the other six channels connect to the five vibration sensors 2 and the vibration displacement reference sensor 3. The network output port of the multi-channel data acquisition unit 4 is connected to a network relay device, which is connected to the dedicated computer 5 in the control room. The dedicated computer 5 in the control room is used for... Fast Fourier Transform (FFT) wavelet analysis is performed on the collected sensor data to calculate vibration velocity and acceleration, thereby obtaining the time and frequency domain characteristics of low-frequency, small-amplitude vibration of the furnace wall. Furnace wall vibration characteristic analysis is also performed to couple furnace negative pressure fluctuations. This involves accepting real-time changes in furnace negative pressure and the time and frequency domain characteristics of low-frequency, small-amplitude vibration of the furnace wall, and performing correlation analysis between the furnace wall vibration characteristic values ​​and the real-time changes in furnace negative pressure. Based on the correlation analysis results, hydraulic dampers 7 are arranged. The correlation analysis method is as follows: along the furnace width, within the unit load rate range of 40%–100%, the time and frequency domain characteristics of low-frequency, small-amplitude vibration of the furnace wall are obtained at 5% load rate intervals. These characteristics are then weighted by the annual average time proportion of each load rate of the unit, and dampers are arranged at the points with the largest amplitude and highest frequency. Considering the symmetry of the entire furnace, the dampers are also arranged symmetrically.

[0023] Furthermore, the five vibration sensors 2 mentioned above are arranged with one on each side of the vertical center line of the front wall, one 5000mm to the left and one 12000mm to the left and one 12000mm to the right of the vertical center line.

[0024] Furthermore, the aforementioned multi-channel data acquisition unit 4 is housed in a dustproof and waterproof box located at the vertical centerline of both side walls.

[0025] The multi-channel data acquisition unit 4 has six channels that receive vibration displacement signals from the five vibration sensors 2 and the vibration displacement reference sensor 3, and provides DC power to the sensors for A / D conversion. The network transmission line from the network output port of the multi-channel data acquisition unit 4 is connected to a spare network relay device on-site. The on-site signal is connected to a dedicated computer 5 located in the central control room via a thermal power trestle line. The dedicated computer 5 is equipped with wavelet analysis software based on Fast Fourier Transform (FFT), which can calculate vibration velocity and acceleration, perform FFT, and obtain the time and frequency domain characteristics of low-frequency, small-amplitude vibration of the furnace wall. The dedicated computer 5 also has furnace wall vibration characteristic analysis software coupled with furnace negative pressure fluctuations. The furnace wall vibration characteristic analysis software is based on the B / S mode and can accept real-time fluctuations in furnace negative pressure and furnace wall vibration characteristic values ​​based on fast Fourier transform wavelet analysis software. It realizes the correlation analysis between furnace wall vibration characteristic values ​​and real-time fluctuations in furnace negative pressure, providing a basis for the optimized design and layout of hydraulic dampers based on coupled furnace negative pressure fluctuation furnace wall vibration analysis. It can also provide a reference for boiler operation adjustment. Five hydraulic dampers 7 are set, with both ends fixedly connected to the vibration sensor 2 on the rigid beam of the front wall 1000mm below the installation position and the corresponding vertical and horizontal positions of the boiler column. The layout of hydraulic dampers 7 and the selection of damping characteristic parameters, as well as the correlation analysis results of furnace wall vibration characteristic values ​​and real-time fluctuations in furnace negative pressure based on the furnace wall vibration characteristic analysis software coupled with furnace negative pressure fluctuations are also included.

[0026] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of protection of the claims.

Claims

1. A method for arranging vibration damping devices on the front wall of a W-flame boiler, characterized in that: The vibration damping device for the front wall of the W-flame boiler includes a hydraulic damper (7), and multiple hydraulic dampers (7) are provided. The two ends of the multiple hydraulic dampers (7) are respectively horizontally hinged to the vertical beam (8) 1000mm below the rigid beam (6) of the front wall and the column (9) outside the boiler wall (10). The arrangement method of the vibration damping device for the front wall of the W-flame boiler includes a fast Fourier transform wavelet analysis system (1) for coupled furnace negative pressure wavelet furnace wall vibration. The fast Fourier transform wavelet analysis system (1) for coupled furnace negative pressure wavelet furnace wall vibration includes five vibration sensors (2), a vibration displacement reference sensor (3), a multi-channel data acquisition device (4), and a dedicated computer (5) in the central control room. The device (2) is arranged at intervals on the rigid beam (6) at an elevation of 51.5m in front of the flame boiler of the W boiler. The vibration displacement reference sensor (3) is arranged at the displacement dead point of the rigid beam (6). The six channels of the multi-channel data acquisition device (4) are connected to five vibration sensors (2) and vibration displacement reference sensor (3). The network output port of the multi-channel data acquisition device (4) is connected to the network relay device. The network relay device is connected to the dedicated computer (5) in the central control room. The dedicated computer (5) in the central control room is used to perform fast Fourier transform wavelet analysis on the collected sensor data, calculate the vibration velocity and vibration acceleration, realize fast Fourier transform, and obtain the time domain and frequency domain characteristics of the low frequency small amplitude vibration of the furnace wall. And the furnace wall vibration characteristic analysis used for coupling furnace negative pressure fluctuation, accept the real-time change value of furnace negative pressure and the time domain and frequency domain characteristics of low frequency small amplitude vibration of furnace wall, realize the correlation analysis of furnace wall vibration characteristic value and real-time change value of furnace negative pressure, and arrange hydraulic dampers (7) according to the correlation analysis results; the correlation analysis method is: along the furnace width direction, in the unit load rate range of 40~100%, the time domain and frequency domain characteristics of low frequency small amplitude vibration of furnace wall are obtained at every 5% load rate, and combined with the annual average time ratio of each load rate of the unit, the damper is arranged at the point with the largest amplitude and the highest frequency, and considering the symmetry of the entire furnace, the damper should also be arranged symmetrically; five vibration sensors (2) are arranged at the vertical center line of the two sides of the front wall, one at 5000mm to the left and right of the center line, and one at 12000mm to the left and right of the center line.

2. The method for arranging a vibration damping device for the front wall of a W-flame boiler according to claim 1, characterized in that: Five hydraulic dampers (7) are used.

3. The method for arranging a vibration damping device for the front wall of a W-flame boiler according to claim 1 or 2, characterized in that: The hydraulic damper is a hydraulic damper with a rated load greater than 50KN. It meets the requirements of boiler hot displacement. The low-speed travel resistance should not exceed 1% of the rated load. The locking speed should be in the range of 125mm / min to 360mm / min. The speed after locking should be in the range of 12mm / min to 125mm / min under the rated load.

4. The method for arranging a vibration damping device for the front wall of a W-flame boiler according to claim 1 or 2, characterized in that: One end of the hydraulic damper (7) is fixedly connected to the extension rod (701), and the other end is hinged to the upper sliding plate (702). The extension rod (701) is hinged to the vertical beam (8). The bottom ends of the upper sliding plate (702) are fixedly connected to the two lower sliding plates (704) by shear pins (703). The two lower sliding plates (704) are fixedly connected to the two H-beams (705). The ends of the two H-beams (705) on the same side are fixedly connected to the two ends of the support beam (706). The middle part of the support beam (706) is fixedly connected to the column (9).

5. The method for arranging a vibration damping device for the front wall of a W-flame boiler according to claim 1, characterized in that: The multi-channel data acquisition unit (4) is placed in a dustproof and waterproof box at the vertical center line of both side walls.

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