Contents
To download Holcim Process Guide and all other Useful Books and calculations Excel sheets please click here
To download Holcim Process Guide and all other Useful Books and calculations Excel sheets please click here
Holcim Key performance indicator for Grate cooler
Specific grate area load: < 45 t/d m2
Calculation: Daily clinker production (t/d) divided by total active grate surface area (m2)
Specific grate width load: < 1’500 t/d m
Calculation: Daily clinker production (t/d) divided by grate width (m)
Grate speed: 10 – 15 str/min
Typical grate speed in strokes / minute (higher speed means higher grate wear)
Installed specific cooling > 2.0 Nm3/kg cli For new coolers
air volume: > 2.3 Nm3/kg cli For old coolers
Calculation: Installed cooling air volume (Nm3/h) divided by hourly clinker production (kg/h)
Installed specific aeration: > 1.0 Nm3/m2s For new coolers
Installed specific aeration: > 1.2 Nm3/m2s For old coolers
Calculation: Total cooling air flow (Nm3/s) per total area of grate (m2).
The value is an average over the entire grate and is usually decreasing from the clinker inlet towards the outlet
Installed cooling air fan pressure: 100 mbar
First (inlet) fan(for modern coolers with fixed inlet)
Sufficient fan pressure is needed to be able to operate at high bed thickness (grate wear,recuperation)
Kiln hood velocity: < 5 m/s For new installations
Kiln hood velocity: < 6 m/s For old installations
Calculation: Secondary air volume at actual temperature (m3/s) divided by kiln hood cross section
area (m2) at level of cooler roof. Include tertiary air (TA) volume, if TA is extracted at kiln hood
instead of cooler roof.
Tertiary air take off velocity < 5 m/s For new installations
(cooler roof extraction): < 6 m/s For old installations
Calculation: Tertiary air volume at actual temperature (m3/s) divided by the cross section
area of the tertiary air duct (m2) at take off.
Waste air take off velocity: < 5 m/s For new installations
Waste air take off velocity: < 6 m/s For old installations
Calculation: Waste air volume at actual temperature (m3/s) divided by the cross section
area of the waste air duct (m2) at take off.
Tunnel velocity (horizontal air velocity towards air extraction locations ):< 10 m/s
Exact calculation of the tunnel velocity is difficult. Rough estimations can be made using
cooling air distribution together with cooler drawings and an estimation of air temperature
at the respective location.
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