Vertical Roller Mills (VRM)
Precision Discharge for Grinding System Stability
In a modern cement plant, the Vertical Roller Mill (VRM) is the heart of the grinding circuit. Grinding efficiency, separator performance, and overall system stability depend heavily on controlled material discharge and air balance.
The Rotary Air Lock at the VRM discharge point is not merely a transfer device, it is a pressure isolation component that directly influences mill performance, power consumption, and product quality.
Oswar Rotocorp Rotary Air Locks are engineered to maintain precise air sealing and stable discharge under continuous fine powder handling conditions.
What Makes This Zone Demanding
Why VRM Discharge Is Critical
- VRMs operate under high negative pressure with continuous airflow circulation
- Air leakage at discharge causes separator efficiency to drop
- Circulating load increases, raising fan power consumption
- Grinding efficiency declines and product fineness becomes unstable
- Even small leakage volumes can significantly disturb air balance
Engineering Challenges in VRM Applications
- Ultra-fine cement powder with continuous high-throughput flow
- High differential pressure and abrasive dust-heavy environment
- Fine cement powder flows easily and escapes through minor gaps
- Precision sealing becomes essential to maintain mill performance
How Oswar Rotocorp Solves It
Minimal Air Leakage
- Optimized rotor-to-body clearance preserves negative pressure
- Precision-machined pockets minimize air bypass
- Tight end cover sealing with high-efficiency graphite seal options
- Protects separator operation and stabilizes mill efficiency
Stable Discharge of Fine Cement Powder
- Smooth volumetric discharge without build-up or choking
- Balanced pocket filling prevents flow pulsation
- Continuous powder evacuation to downstream conveyors
- Reduced material compaction improves transport predictability
Protection of Downstream Pneumatic Systems
- Precision sealing reduces pressure loss in pneumatic lines
- Stable conveying velocity prevents pipeline instability
- Reduces blower load and energy consumption
- Supports consistent pneumatic performance
Optimized Mill & Separator Performance
- Maintains cyclone efficiency and stabilizes circulating load
- Reduces over-grinding and supports target fineness (Blaine control)
- Controlled airflow at discharge directly reduces energy per ton
- Consistent air balance supports separator blade performance
Engineering Features
Operational Benefits
Recommended Series for Vertical Roller Mills (VRM)
VRM performance is not only about grinding, it is about air control. And air control begins at the discharge point. Oswar Rotocorp Rotary Air Locks are engineered to protect the air balance, discharge stability, and long-term performance of Vertical Roller Mill systems.