Compressors and heat recovery system

The compressors installed are three ZR 300s, one ZR 315 with variable speed drive (VSD), and one ZR 400. Each compressor is combined with a heated blower purge desiccant air dryer, or BD dryer, to obtain a high-quality dewpoint (PDP < -40C). Nanium also specified no oil and a low quantity of particles to standard ISO 8573 Class 0 to meet its strict standards.

An Atlas Copco ER 900 unit, a heated water management system for heat recovery in oil-free, water-cooled compressors, recovers heat in the form of hot water. Atlas Copco changed the company’s compressor to discharge its cooling water at about 80°C. Hot water is pumped to a heat exchanger, whose secondary circuit circulates return water to the boiler. As a result, primary energy gas input is dramatically reduced.