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Fused-Cast AZS Block
Fused-cast AZS block (Al₂O₃≥48%, ZrO₂≥32%, bulk density ≥3.60 g/cm³, porosity ≤2%) is cast from the melt to near-zero porosity, giving outstanding resistance to glass-melt erosion and scouring.
Learn More →Burner Port Brick Damage
Regenerator · Burner Port
Problem Details
Background
The burner port (throat) of a glass furnace regenerator is the passage for gas/combustion air entering and waste gas leaving. It long-term bears high-temperature flame scouring, gas abrasion and alkali-vapor attack. Port-brick damage is a common issue, affecting flame shape, thermal efficiency and furnace pressure stability.
Failure Mechanism
Flame and gas scouring: high-temperature flame and high-velocity gas pass through the port, thermally scouring and abrading the bricks. Alkali-vapor attack: alkali vapor condenses at the port and attacks the bricks. Thermal shock: reversals and temperature swings thermally crack the bricks. Structural loosening: loose brick-furnace connections widen joints and let broken bricks fall.
Consequences
After damage, flame shape and thermal efficiency drop, furnace pressure swings and melt temperature becomes uneven; broken bricks may plug the regenerator or damage equipment, forcing shutdown for repair.
Solution
Material Selection and Parameters
Select burner ports for "high-temperature resistance + alkali resistance + scouring resistance":
- Material system: mullite brick (Al₂O₃≥75%) or fused-cast AZS. Mullite resists thermal shock and high temperature; AZS is dense with outstanding alkali and scouring resistance for the heaviest flame zones;
- Structural design: precise special-shaped assembly with tight joints; design segmented replaceable structures for easy maintenance;
- Joint materials: lay with matching mortar, joints ≤1mm.
Installation Essentials
Precise assembly: assemble special-shaped bricks by number with joints ≤1mm. Locking: lock bricks against loosening. Bake-out: follow the curve to avoid residual moisture in mortar.
Maintenance
Monitor port temperature and flame shape; investigate on anomalies. Inspect loosening and cracking regularly; at maintenance, replace damaged bricks and check the regenerator junction to keep ports intact.
Recommended Products
Featured
Mullite Brick
Mullite brick with mullite as the main phase (Al₂O₃≥75%, refractoriness ≥1850℃, RUL ≥1650℃) offers high-temperature volume stability with excellent thermal-shock and creep resistance.
Learn More →Other Problems of This Kiln
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