A Complex 3D Acoustic Induced Vibration of a Low Nox Refinery Boiler

摘要

An increasing number of refinery and other large process steam boilers are being installed with or converted to low Nox combustion. The primary result of low Nox combustion is reduced emissions; however, this type of combustion can also lead to unsteady pressures (pulsation), rumbles, and vibrations of boiler components and walls. This paper reports on an investigation of vibrations that were observed on the walls of a new low Nox boiler during its commissioning. Dynamic measurements and 3D acoustic modeling were used to identify and define the fluid force (acoustic) induced vibration problem and to design baffles to eliminate the specific complex acoustic mode that was causing the vibrations.