Contents

- 1 To download Holcim Process Guide and all other Useful Books and calculations Excel sheets please click here
- 2 To download Holcim Process Guide and all other Useful Books and calculations Excel sheets please click here
- 3 Holcim Key performance indicator for Grate cooler
- 3.1 Specific grate area load: < 45 t/d m2 Calculation: Daily clinker production (t/d) divided by total active grate surface area (m2)
- 3.2 Specific grate width load: < 1’500 t/d m Calculation: Daily clinker production (t/d) divided by grate width (m)
- 3.3 Grate speed: 10 – 15 str/min Typical grate speed in strokes / minute (higher speed means higher grate wear)
- 3.4 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)
- 3.5 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
- 3.6 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)
- 3.7 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.
- 3.8 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.
- 3.9 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.
- 3.10 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.

# 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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