Maintenance Scope

1. Installation and adjustment of radial, axial and circumferential (bypass) sealing assemblies
2. Maintenance, installation and adjustment of central cylinder seals
3. Maintenance, installation and adjustment of cold & hot end sector plates (including static seals and adjusting mechanisms)
4. Maintenance, installation and adjustment of arc plates (axial sealing strips)
5. Maintenance, installation and adjustment of rotor angle steel (T-section steel)
6. Overhaul of guide bearings and support bearings
7. Unpacking, high-pressure water cleaning, replacement and installation of heat storage elements
8. Maintenance of transmission systems including reducers and girth gears
9. Routine air preheater maintenance (rotor verticality adjustment, shell maintenance, static seal overhaul, compartment partition maintenance, support tube maintenance, etc.)

Our Air Preheater Product Portfolio

Floating Sealing Assembly

Product Features

1. Simple retrofitting: No modification to the original air preheater structure. Dual-layer sealing based on existing seals maintains a persistently low air leakage rate long-term.
2. Stable operation: Guide rods nested inside springs prevent spring detachment and guarantee reliable performance.
3. Optimized self-lubricating metal sheets avoid abrasion on sector plates and extend their service life.
4. High-performance spring assembly: Compression springs feature stable elasticity and long service life to control movable plate movement and buffer impact efficiently.
5. Enclosed rotating shaft structure blocks dust ingress and avoids scaling on shafts.

Gravity Sealing Strip

Product Features

1. Matches traditional rigid sealing strips with the mounting sequence: rigid strip – compartment partition – gravity sealing assembly.
2. Simple structure with ultra-low failure rate, eliminating hidden risks of spring failure/detachment seen on spring flexible seals.
3. Easy installation without damaging the preheater structure for long-term stable operation.
4. Self-lubricating metal sheets fitted on movable plates protect sector plates with low friction and mild abrasion.
5. Built-in limiting structure prevents excessive opening of sealing strips for stable operation.
6. Larger compensation range for sector plate contact adapts well to fluctuating unit loads and sustains low air leakage rates.

Rigid Sealing Strip

Product Features

1. Universal fit for all rotary air preheaters.
2. Carefully selected materials resist corrosive environments post denitrification.
3. Bent top design mitigates motor current surges during scraping contact and avoids drive motor overload shutdown.
4. Service life ≥ 6 years.

Sector Plate

Product Features

1. Compatible with all Ljungström air preheaters for both cold and hot ends.
2. Available in materials including 16Mn and Q345 to suit diverse operating conditions and match all rotor radial seals.
3. Custom fixed or adjustable versions on demand; adjustable models require matched adjustable static seals and sector plate adjusting mechanisms.

Compartment Partition Plate

Air Preheater Connection Plate Assembly

Heat Storage Element

Product Features

1. Stable basket frame structure resists breakage during lifting and transportation.
2. Full encapsulation inside frames prevents damage to heat transfer plates under all working conditions.
3. User-friendly lifting and installation design.
4. Optimized spatial layout accommodates more corrugated plates for enhanced heat exchange performance.
5. Service life ≥ 80,000 operating hours.
6. Exclusive YRW corrugation design for easy cleaning and soot blowing.
7. Electrostatic enamel coating complying with ISO 2178 enamel thickness standards.
8. Manufactured to EN10204-3.1B material certification standards.
9. Corrosion testing performed per ISO 27422.
10. Factory pre-tests including impact, pinhole, bending and pre-compression strength tests.

Arc Plate

Product Features

1. Fits all Ljungström air preheaters and installed on outer shells.
2. Materials such as 16Mn and Q345 available for various working environments and all rotor radial seal types.
3. Custom fixed or adjustable designs on request; adjustable versions paired with matched static seals and adjusting assemblies.

Central Cylinder Sealing Strip

Product Features

1. Universally applicable to all rotary air preheaters.
2. Robust maintenance-free structure requiring only one-time on-site adjustment for long continuous operation.
3. Serialized, modular components simplify field assembly and shorten retrofit schedules.
4. Service life ≥ 6 years.

Rotor Angle Steel

Product Features

1. Suitable for all Ljungström air preheaters for cold and hot end installation.
2. Simple structure for easy field mounting and adjustment.
3. Mass-produced segmented parts for on-site circular assembly and fine-tuning before welding.
4. Minimal turning allowance, low adjustment workload and short retrofit cycle.

Selected Air Preheater Project References