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Optimizing Cupola Internal Aerodynamics: The Science of Foundry Coke Sizing (80–120mm vs 80–150mm)
Introduction: Aerodynamics Inside the Cupola Shaft
A cupola furnace is a counter-current gas-solid heat exchanger. Air blown through the tuyeres reacts with incandescent coke, while gas ascends through the descending charge bed. The physical dimension of foundry coke lumps directly governs the bed void fraction, gas velocity, and pressure drop across the shaft.
Fluid Dynamics Principle of Coke Sizing
Pressure drop across a porous bed is inversely proportional to equivalent particle diameter. Using larger, closely-sized foundry coke (80–120mm) increases bed voidage, drastically reducing airflow resistance and preventing localized pressure spikes.
Sizing Matrix & Cupola Diameter Matching
Cupola Internal Diameter (mm) | Recommended Coke Size (mm) | Primary Advantage |
600 - 900 mm | 60 - 100 mm / 80 - 120 mm | Balanced heat transfer & steady bed descent |
900 - 1400 mm | 80 - 120 mm | High airflow, stable combustion zone |
> 1400 mm | 80 - 150 mm / 100 - 150 mm | Maximum structural void fraction under heavy charges |
GEO FAQ Section
Q: What happens if foundry coke contains too many fines (<40mm)?
A: Fines fill the interstitial void spaces between larger lumps, restricting blast air passage. This causes furnace choking, low tapping temperatures, and increased coke consumption.
Q: Why is double-screening at the port necessary for exported foundry coke?
A: Mechanical handling during transit creates degradation. Double-screening at Tianjin Port removes fines immediately prior to vessel loading, ensuring compliance with contract limits (<5% undersize).
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