Research and Development of Viscous Fluid Dampers for Improvement of Seismic Resistance of Thermal Power Plants: Part 4 — Experimental Study on Environmental Applicability and Durability of Damper

Abstract

A purpose of this study is an improvement of seismic proof construction for power plants to supply power stably at an emergency. At present, the most common type of power generation in Japan is thermal. In particular, coal-fire becomes base load power. A proposal of this study is that boiler structure is applied vibration control. The way is that a damper used viscous fluid is set instead of stopper between the boiler and the support structure. However, inside temperature of the boiler structure is higher than the environment of the general because it uses burning of coal and steam. Therefore, this paper shows that the damper has applicability for the environment of the boiler structure. Then it is necessary for structures to endure earthquake with long duration and long period component in Japan. The 2011 off the Pacific coast of Tohoku Earthquake had the largest energy in history of Japan with them. The damage occurred not only in Tohoku but also in far Tokyo and Osaka. Moreover, it is predicted that large earthquakes with them at the south Pacific coast of Japan occur. This paper shows that the developed damper is effective in earthquake with these characteristics by analyses and component tests.

Shaking table test of the shock absorbing performance of a new cable‐damper stopper for coal‐fired thermal power plants

“…Aida et al 24 evaluated the aseismic reliability of actual boiler structures equipped with conventional stoppers, which dissipate energy by material plastic deformations of the stoppers and further conducted proof tests by using a large‐scale shaking table. Some other scholars 25–27 reported a viscous‐damping stopper theoretically, which works in earthquakes with relatively large numbers of cycles compared with the conventional metal stoppers, and found that the viscous‐damping stoppers worked better than the conventional ones in reducing the seismic responses of the CFTPP. Another kind of stopper which combines viscous damper and friction damper was reported, 28 which indeed reduced the seismic responses of the targeted CFTPP by transforming the kinetic energy into internal energy.…”