Mokesys - Flexible Tiling Systems

The System Requirements

• High-temperature strength
• High thermal conductivity
• Mechanical and structural stability
• Prevention of slag deposits

The patented Mokesys® tile system

• Allowance for different expansions in the boiler and between the boiler and the tiling system
• Allowance for expansions in the event of local overheating and unbalanced load
• High oxidation resistance by nitride bonding and double fired method
• Flue-gas protected supports made of corrosion-resistant stee

The benefits

• Durability and long service life
• High heat transfer
• Low contamination, low build-up of slag
• Highly cost effective
• Easily serviced

The classical Mokesys® tile systems
Mokesys® provides double protection against tube wall corrosion: Firstly by a thin closed layer of low-pororosity, specially developed fine-grained SiC concrete, and secondly by the internationally patented Mokesys® tiles.

In practice, the nitride bonding of the fine SiC grains and the double-firedtiles offer long-term resistance to aggressive slag, high temperatures and high energy density, plus excellent thermal fatigue resistance. Customised tile dimensions guarantee optimum system behaviour in operation.

Different expansions of the tiles and the boiler steelwork are compensated by an intelligent design and specifically calculated expansion joints.

The heat resistant metallic tile supports are positioned away from the expansion joint behind the tile and are thus protected against flue gas corrosion.

Rear-ventilated:
The Mokesys® Air 2E tile system
Mokesys® Air 2E is a rear-ventilated tiling system for boiler tube walls that has been specially developed for the boiler area above the combustion chamber. The system consists of nitrided SiC tiles and an air sealing layer that is supplied via an external ventilation system.

The benefit offered by the rear-ventilated tiling system is in the safe protection of the tube wall against corrosion, even if cracks are present and joints are not tight. This system is predominantly used in boilers which are subject to greater movement and the associated stresses, and exposure to potentially very corrosive flue gases. Specific thermal conductivities must be considered during the design process.

The heat resistant metallic tile supports are positioned away from the expansion joint in the air flow behind the tile and are thus protected against corrosion.

The Mokesys® Air 2E inspection tile can be removed and replaced quickly and easily. Inspection of the tube wall and measurement of the temperatures can be carried out with little effort.

The air seal is created in the gap between the tile and the tube wall by slightly compressed air in the manifold and the openings in the tube wall membrane.

High process requirements, extraordinary stress on the boilers by corrosion, and special boiler designs require customised systems that are suitable for practical applications.

SiC system brick
Transitions between boiler components are optimally designed by moulded bricks. The Mokesa concept has been designed for real-operational conditions, which is confirmed by the long service life and the high functionality.

Ancor
High thermal conductivity is created thanks to low porosity, high SiC content and a low system thickness which all assist in the reduction of the surface temperature. Combined with a smooth surface, this lowers the risk of adhesion and build-up of deposits.