Kiln Inlet/Outlet Gas Calculator — cementequipment.org

Kiln Inlet/Outlet Gas Calculator

Calculate gas velocity, flow rates, dust loading, and gas density at kiln inlet and outlet

Kiln & Operating Parameters

Clinker Production (tpd)tons per day clinker

Specific Heat Consumption (kcal/kg)Typical: 700–850 SP, 900–1100 wet

Excess Air Ratio (n)Typical: 1.05–1.15 SP kiln

Kiln Type

Section

Diameter (m)Kiln shell inner D ~4.8m, riser ~2.5m, outlet ~3.5m

Gas Temperature (°C)Typical: 1000–1100 inlet, 800–950 riser, 300–380 outlet

Dust Loading (g/Nm³)Typical: 50–150 inlet, 50–100 outlet

Pressure (mbar)Kiln inlet pressure (negative)

Raw Meal Factor (kg/kg cli)kg raw meal / kg clinker

Parameter	Typical Range	Unit
Gas Velocity (kiln inlet)	8 – 15	m/s
Gas Velocity (riser duct)	15 – 25	m/s
Gas Velocity (preheater outlet)	12 – 20	m/s
Specific Gas Volume	1.45 – 2.0 (SP)	Nm³/kg cli
Dust Loading (kiln inlet)	50 – 150	g/Nm³
Gas Density (0°C)	1.25 – 1.30	kg/Nm³