tool to calculate Vertical Mill heat balance by Loesche

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tool to calculate Vertical Mill heat balance by Loesche

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Loesche – Heat Balance Calculation
Fill in white cells
 Composition %Moisture %
Limestone4045.63
Marl50611.06
Sand7102.67
Iron ore370.78
Total10020.14t/h
Mill output379.86t/h
Feed400t/h
Moisture on finish product0.5%
Gas Flow Balance
InputsOutputs
Amount (t/h)Nm3/h%Nm3/h%
Mill inlet gas flow33000084.1Mill outlet gas flow392572100
Water from feed20.14251766.4
Water injection562501.6
False air311477.9
TOTAL392572100392572100
In a vertical roller mill the % of false air is usely between 5 and 10%
330000Nm3/h on wet392572Nm3/h on wet
Gas coming from the kiln270°C307230Nm3/h on dryGas temperature100°C346248.854Nm3/h on dry
%th/h%th/h
CO226.19687CO223.073363
O26.771812O28.39909
CO0.126CO0.066
N267.217363N268.537261
H206.92250H2011.81654
100.1731137100.05131931794417496-2.496
Heat balance
InputsOutputs
t/h or Nm3/hT° (°C)kCal/Nm3th/hth/toutput%t/h or Nm3/hT° (°C)kCal/Nm3th/hth/toutput%
or kCal/kgor kCal/kg
Hot gases from kiln3300002703113781.9785.2Gases3925721001319334.735.4
Mill feed379.86203.914813.94.1Kiln dust219016.73510.90.9
Water from feed251762071760.50.5
Water injection6250103.5220.10.1Kiln feed3809018.5702718.518.9
False air31147257.72400.630.7Water vaporisation25.146361598942.142.9
Kiln dust212705511553.03.2Convexion + radiation7021.81.9
Table motor energy23536.26.4
TOTAL3656596.3100.0TOTAL3726398.1100.0
Difference2%

 

 

 

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