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http://dx.doi.org/10.5050/KSNVE.2013.23.5.385

Mechanism Diagnosis and Avoidance Design on Transient Acoustic Vibration of Reheater Water Supply Piping in Supercritical Boiler  

Kim, Yeon-Whan (Green Energy Laboratory KEPCO Research Institute)
Bae, Yong-Chae (KEPCO Research Institute)
Kim, Jae-Won (KOREA WESTERN POWER Co., Ltd.)
Lee, Doo-Young (KEPCO Research Institute)
Heo, Hae-Yong (KOREA WESTERN POWER Co., Ltd.)
Publication Information
Transactions of the Korean Society for Noise and Vibration Engineering / v.23, no.5, 2013 , pp. 385-393 More about this Journal
Abstract
In this paper, the mechanism identification and the avoidance measures on the phenomena of transient acoustic vibration amplified at the water-supply piping system to regulate the steam temperature of the boiler reheater in 500MW class supercritical power plant are presented. The pressure pulsation waves induced by the impeller passing of two feed-water pumps with five blades are coincident with the local acoustic modes of boiler reheater water-supply piping system. There are the phenomena amplified at the peaks of 5X, 10X, 15X and 20X in spectrums of piping vibration, sound pressure, and the feed-water's pressure pulsation waves. The shut-off device is installed in the piping system for the interception of pressure pulsation waves transmitted from two feed-water pumps and the modified design change of the piping layout is applied for the acoustic resonance avoidance. The acoustic natural frequencies are separated from the harmonics of pressure pulsation waves induced by the pump impellers passing through the design change of the span length. The acoustic vibration is gone by resonance avoidance measures. As a result, more than 20 dBA reduction is achieved from 100 dBA to 80 dBA.
Keywords
Boiler Reheater Water-supply Piping; Temperature Control Valve; Transient Acoustic Vibration; Impeller Passing Pulsation; Pressure Pulsation Wave; Avoidance Design;
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Times Cited By KSCI : 1  (Citation Analysis)
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