Loesche - Heat Balance Calculation

Composition % Moisture %

Limestone 40 4 5.63

Marl 50 6 11.06

Sand 7 10 2.67

Iron ore 3 7 0.78

Total 100 20.14 t/h

Mill output 379.86 t/h

Feed 400 t/h

Moisture on finish product 0.5 %

Gas Flow BalanceInputs Outputs

Amount (t/h) Nm3/h % Nm3/hMill inlet gas flow 330000 84.1 Mill outlet gas flow 392572Water from feed 20.14 25176 6.4 Water injection 5 6250 1.6False air 31147 7.9TOTAL 392572 100 392572

In a vertical roller mill the % of false air is usely between 5 and 10%330000 Nm3/h on wet

Gas coming from the kiln 270°C 307230 Nm3/h on dry Gas temperature 100°C% th/h %

CO2 26.1 9687 CO2 23.07O2 6.77 1812 O2 8.39CO 0.1 26 CO 0.06N2 67.2 17363 N2 68.53H20 6.9 2250 H20 11.8

100.17 31137 100.05

Heat balanceInputs

t/h or Nm3/h T° (°C) kCal/Nm3 th/h th/toutputor kCal/kg

Hot gases from kiln 330000 270 31137 81.97Mill feed 379.86 20 3.9 1481 3.9Water from feed 25176 20 7 176 0.5Water injection 6250 10 3.5 22 0.1False air 31147 25 7.7 240 0.63Kiln dust 21 270 55 1155 3.0Table motor energy 2353 6.2TOTAL 36565 96.3

Gas Flow Balance

%100

100

392572 Nm3/h on wet346248.854 Nm3/h on dry

th/h3363

9096

72611654

13193 17944 17496 -2.496

Outputs % t/h or Nm3/h T° (°C) kCal/Nm3 th/h th/toutput

or kCal/kg85.2 Gases 392572 100 13193 34.7

4.1 Kiln dust 21 90 16.7 351 0.90.50.1 Kiln feed 380 90 18.5 7027 18.50.7 Water vaporisation 25.14 636 15989 42.13.2 Convexion + radiation 702 1.86.4

100.0 TOTAL 37263 98.1

Difference 2 %

%

35.40.9

18.942.9

1.9

100.0