Rotary Air Preheater (RAPH)
1. Rotor Assembly
- Rotor housing (casing)
- Rotor sectors / baskets
- Rotor post and diaphragm plates
- Sector plates and support grids
Designed to hold heat transfer elements and ensure structural integrity during rotation.
2. Heat Transfer Elements (Heating Baskets)
- Corrugated heat transfer plates
- Hot-end, intermediate, and cold-end elements
- Carbon steel / Corten steel / enamel-coated elements
Provide efficient heat recovery from flue gas to incoming air.
3. Drive System
- Electric motor
- Main gearbox
- Auxiliary (turning) drive
- Couplings and drive pinion
Ensures smooth and controlled rotation of the rotor.
4. Bearing System
- Thrust bearing
- Guide (radial) bearing
- Bearing pedestals and lubrication system
Supports rotor weight and maintains alignment under operating loads.
5. Sealing System
- Radial seals
- Axial seals
- Circumferential seals
- Flexible seal strips
Minimizes air-to-gas leakage and improves thermal efficiency.
6. Housing & Casing
- Air and gas ducts
- Expansion joints
- Inspection doors and access covers
Provides containment and allows maintenance access.
7. Soot Blowing & Cleaning System
- Steam / air soot blowers
- Water washing connections (if applicable)
- Ash handling provisions
Prevents fouling and maintains heat transfer efficiency.
8. Sector Plates & Diaphragms
- Gas and air sector plates
- Diaphragm plates
- Structural stiffeners
Ensure proper separation of air and gas streams.
9. Expansion & Protection Components
- Expansion bellows
- Thermal relief plates
- Hot-end corrosion protection coatings
Accommodate thermal expansion and resist corrosion.
10. Instrumentation & Accessories
- Speed monitoring devices
- Temperature sensors
- Differential pressure gauges
- Drive and bearing protection switches
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