Table 2: Indirect detecting parameters and their calculation formulas.

Variable (unit)Calculation formulas

Oxygen enrichment percentage (%)
Gas permeability (m3/min·kPa)
Gas volume of bosh (GVB) (m3/min)
Bosh gas index (m3/(min·m2))GVB/78.5398125
Blast kinetic energy (kJ/s)
Feed blast ratio (wt%)
Resistance coefficient
Theoretical burning temperature (°C)
Actual wind speed (AWS) (m/s)