Aeration System Optimization Can Offer the （曝气系统的优化提供了）.pdf

Aeration System Optimization Can Offer the Greatest Long-term Savings OWEA 2012 | June 2012 Rich Atoulikian, PMP, P.E. Outline • Aeration Blower Types • Efficiency Comparison • Turbo Blowers • Blower Sizing Consideration Wastewater Treatment Plant Power Usage by Unit Process Actual Percentages Depends on: • Overall Process • Process Design Parameters • Effluent Criteria Aeration System Components For Activated Sludge Plants Blowers provide the motive power to deliver air to the diffusers Aeration Blower Types • Positive Displacement – Rotary Lobe • Constant, or variable speed drive • Centrifugal – Multi-Stage • Inlet throttling • Variable speed drive – Single-Stage Centrifugal • Direct Drive • Single-point guide vane control • Two-point guide vane control Existing Blower Technologies Positive Displacement Blowers – Lower flow, higher pressure • 3000 cfm, 10 psi – Low turn-down, can’t throttle inlet – Low efficiency – Noisy Existing Blower Technologies Multi-stage Centrifugal – Each Stage Increases Discharge Pressure – Higher flow 3000 cfm – Low efficiency, low turn-down • ~ 30% turn-down – Industry standard for many years – Usually inlet butterfly and/or VFD Control Existing Blower Technologies Single-stage Centrifugal – Guide Vane Control – Higher turn-down than multi-stage • ~ 50% – More efficient than multi-stage • 70% – Sound attenuation