📋 Case Study

Furnace Refractory Lining Failure Analysis in Aluminum Melting Facility

Thermal cycling-induced cracking and alkali attack from flux residues

🏗️ Project Overview

Recurring spalling in sidewall lining of 25-ton reverberatory furnace

🎯 Challenge

Thermal cycling-induced cracking and alkali attack from flux residues

🔧 Design Approach

Thermal stress modeling + chemical compatibility mapping → replacement with low-cement alumina-silica castable + embedded thermocouple mesh

📐 Design Diagram

AI-generated project design illustration

📐 Key Calculations

Thermal Stress Index

σ_th ∝ α × E × ΔT / (1−ν)

Result: 142 MPa (exceeding 110 MPa strength)

Primary failure driver

Flux Penetration Depth

δ ∝ √(D × t)

Result: 3.2 mm after 120 hrs

Guides minimum lining thickness

📊 Results

Lining life extended from 9 to 27 months; energy loss reduced by 8.3% via improved insulation integrity

💡 Lessons Learned

• •Real-time surface temperature mapping prevents localized hot spots
• •Flux chemistry audit reduced Na₂O contamination by 70%

✅ Key Takeaways

• 1Real-time surface temperature mapping prevents localized hot spots
• 2Flux chemistry audit reduced Na₂O contamination by 70%