Dokumen.tips_vertical-raw-mill-heat-balance-solution.xls
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Loesche - Heat Balance Calculation Composition %
Moisture %
Limestone
40
4
5.63
Marl
50
6
11.06
Sand
7
10
2.67
3
7
Iron ore Total
0.78
100
20.14 t/h
Mill output
379.86 t/h
Feed
400 t/h
Moisture on finish product
0.5 %
Gas Flow Balance Inputs
Outputs Amount (t/h)
Mill inlet gas flow Water from feed Water injection False air TOTAL
20.14 5
Nm3/h 330000 25176 6250 31147 392572
% 84.1 Mill outlet gas flow 6.4 1.6 7.9 100
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 % th/h CO2 26.1 9687 O2 6.77 1812 CO 0.1 26 N2 67.2 17363 H20 6.9 2250 100.17 31137
Gas temperature CO2 O2 CO N2 H20
Nm3/h 392572
392572
100°C % 23.07 8.39 0.06 68.53 11.8 100.05
Heat balance Inputs t/h or Nm3/h Hot gases from kiln Mill feed Water from feed Water injection False air Kiln dust Table motor energy TOTAL
330000 379.86 25176 6250 31147 21
T° (°C) 270 20 20 10 25 270
kCal/Nm3 or kCal/kg 3.9 7 3.5 7.7 55
th/h
th/toutput 31137 1481 176 22 240 1155 2353 36565
81.97 3.9 0.5 0.1 0.63 3.0 6.2 96.3
% 100
100
392572 Nm3/h on wet 346248.854 Nm3/h on dry th/h 3363 909 6 7261 1654 13193
17944
17496
-2.496
Outputs % 85.2 4.1 0.5 0.1 0.7 3.2 6.4 100.0
t/h or Nm3/h Gases Kiln dust Kiln feed Water vaporisation Convexion + radiation
T° (°C)
kCal/Nm3 or kCal/kg
392572 21
100 90
380 25.14
90
16.7 18.5 636
TOTAL Difference
th/h
th/toutput
13193 351
34.7 0.9
7027 15989 702
18.5 42.1 1.8
37263
98.1
2 %
% 35.4 0.9 18.9 42.9 1.9 100.0
Moisture %
Limestone
40
4
5.63
Marl
50
6
11.06
Sand
7
10
2.67
3
7
Iron ore Total
0.78
100
20.14 t/h
Mill output
379.86 t/h
Feed
400 t/h
Moisture on finish product
0.5 %
Gas Flow Balance Inputs
Outputs Amount (t/h)
Mill inlet gas flow Water from feed Water injection False air TOTAL
20.14 5
Nm3/h 330000 25176 6250 31147 392572
% 84.1 Mill outlet gas flow 6.4 1.6 7.9 100
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 % th/h CO2 26.1 9687 O2 6.77 1812 CO 0.1 26 N2 67.2 17363 H20 6.9 2250 100.17 31137
Gas temperature CO2 O2 CO N2 H20
Nm3/h 392572
392572
100°C % 23.07 8.39 0.06 68.53 11.8 100.05
Heat balance Inputs t/h or Nm3/h Hot gases from kiln Mill feed Water from feed Water injection False air Kiln dust Table motor energy TOTAL
330000 379.86 25176 6250 31147 21
T° (°C) 270 20 20 10 25 270
kCal/Nm3 or kCal/kg 3.9 7 3.5 7.7 55
th/h
th/toutput 31137 1481 176 22 240 1155 2353 36565
81.97 3.9 0.5 0.1 0.63 3.0 6.2 96.3
% 100
100
392572 Nm3/h on wet 346248.854 Nm3/h on dry th/h 3363 909 6 7261 1654 13193
17944
17496
-2.496
Outputs % 85.2 4.1 0.5 0.1 0.7 3.2 6.4 100.0
t/h or Nm3/h Gases Kiln dust Kiln feed Water vaporisation Convexion + radiation
T° (°C)
kCal/Nm3 or kCal/kg
392572 21
100 90
380 25.14
90
16.7 18.5 636
TOTAL Difference
th/h
th/toutput
13193 351
34.7 0.9
7027 15989 702
18.5 42.1 1.8
37263
98.1
2 %
% 35.4 0.9 18.9 42.9 1.9 100.0
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