Urgent request: Selection of lateral wind resonance loads for absorption towers equipped with windbreak rings
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The desulfurization absorption tower is 40 m high, with a 20 m tall chimney on top, giving a total height of 60 m. The diameter of the absorption tower is 5.3 m, while that of the chimney is 2.30 m. After calculating the critical wind speed, it is necessary to take into account lateral wind resonance associated with the first mode of vibration. However, such calculations result in very high wind loads, requiring the bottom wall panels to be quite thick – around 20 mm. Now, considering that the absorption tower itself has multiple maintenance platforms, and that a windbreak ring has been installed at the chimney section, should wind loads due to lateral wind resonance still be taken into account when performing calculations? Or can only the wind loads acting in the longitudinal direction be considered? ? ? I hope some experts can give some advice.
As a supplementary point: the wall of the desulfurization absorption tower is lined with glass flake material, and it is equipped with spraying systems and mist removal devices. There are also numerous platforms and reinforcing ribs around it. If a windbreak ring is added to the chimney section, could this prevent cross-wind resonance? Without cross-wind resonance, there would be no need to account for the wind bending moments that occur during such resonance. I’m not sure if my thinking is correct ? ?
No. The height and height-to-diameter ratio of your tower have reached the levels at which lateral wind vibration needs to be taken into consideration. The calculated wind bending moment is the resultant vector moment in both the longitudinal and transverse directions, and this value is slightly higher than that calculated solely for the longitudinal direction.