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Phase I: Shutdown & Cooling
This critical first phase focuses on safely bringing the furnace to a standstill.
Controlled Shutdown & Glass Tapping: The production line is gradually slowed, and the molten glass is completely drained from the furnace through a designated tap-out.
Forced Cooling: High-capacity fans are used to circulate air, controlling the cooldown rate to prevent thermal shock damage to the refractories.
Natural Cooling: Once a safe temperature is reached, the furnace is left to cool naturally to ambient temperature. This entire phase can take several weeks.
Phase II: Demolition & Inspection
This is the diagnostic phase that determines the scope of the repair.
Furnace Demolition: Heavy machinery is used to dismantle and remove damaged and worn refractory linings from the melting tank, superstructure, and regenerators.
Comprehensive Inspection: A thorough examination of the exposed furnace steel structure and remaining refractories is conducted. This inspection is crucial as it finalizes the rebuilding plan and the precise list of required refractory materials.
Phase III: Rebuilding & Relining
This is the core restoration phase and the most critical for a refractory supplier.
Furnace Rebuilding: New refractories are meticulously installed according to engineering designs. This is when high-performance products like Sintered Chrome Corundum Bricks AC-15 are laid in key areas like the regenerators.
Steel Structure Adjustment: The furnace’s steel framework is straightened, reinforced, or replaced as needed to provide solid support for the new lining.
Phase IV: Heat-Up & Production
The new furnace is carefully brought back to life.
Controlled Heat-Up (Drying-Out): The furnace is heated according to a strict, slow schedule over several weeks. This process drives out moisture and allows the refractories to expand safely into their operational state.
Loading & Commissioning: Batch material is introduced once operating temperature is approached. The furnace parameters are fine-tuned to establish a stable molten glass pool.
Stable Production: The furnace reaches its optimal operating condition, producing high-quality glass and marking the successful completion of the cold repair.
