Tertiary Air Duct (TAD)

TERTIARY AIR DUCT (TAD)

Air from the grate cooler is filled with highly abrasive clinker dust as well as residual alkali vapors. When it is travelling through the tertiary air duct at a velocity of 25-30 m/s and an initial temperature of about 1050°C, it wears down the lining particularly at bends and dampers. Abrasion resistance and alkali resistance are both important in tertiary air duct refractories.

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Our refractory solutions are listed on the table below:

Area / Temperature (°C) Processing Conditions Monolithic solution Brick solution Energy Saving brick solution
High temperature 800- 1200°C • Alkali corrosion and infiltration
• Thermal shock
• High temperature
• Abrasion		• HÖGANÄS CAST /GUN LC 50 AR
Severe Conditions
•HÖGANÄS CAST LC 60 AR
•HÖGANÄS CAST LC 75 AR
•HÖGANÄS CAST/GUN LC S10
Insulation
•HÖGANÄS INSUL CC 1,5L		Viking 330
Alex(hot zone calciner)
Severe conditions/build ups

Alsic 500(Riser duct/combustion chamber)
Silox60(TAD 5-10m)
Insulation

HÖGANÄS INSUL M E/brick
HIPOR 450/brick
Super 1100E		Viking 330 (230-300mm)
Severe conditions

Alsic 500(Riser duct/combustion chamber 230-300mm)
Silox60(TAD)
Insulation
Insulation 1: Porosil 23/brick
Insulation 2: HÖGANÄS INSUL 450/brick
Normal temperature
400-800°C		Mild abrasionHÖGANÄS CAST CC 30
HÖGANÄS CAST CC 40		Same as above Same as above