Shutdown of a Gas-Fired Power Plant Prevented

A gas-fired power plant with engine emissions of approximately 120 dB was on the verge of an officially ordered shutdown under noise-protection regulations. The existing damping was not enough to meet the limits.

Conventional mineral-wool silencers hit a structural dead end: the available space between the radiators was simply too small for the thickness of bulky rock-wool absorbers.

Instead of relying on mass and volume, micro-perforated Absora-sheet panels were used. The interior walls, doors and floor areas were lined directly with these highly rigid metal panels.

Because Absora-sheet is particularly effective in the critical low-frequency range, the annoying hum of the engine could be eliminated in a targeted way. To make up for the lack of length, angled “sound pockets” were integrated — artificially extending the sound path without raising the back-pressure needed for cooling.

Measurable success: a reduction of the sound-pressure level by −6 dB.

Economy: the shutdown was successfully averted and plant operation secured.

Longevity: the all-metallic system is completely insensitive to high air velocities and vibrations.