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Calculation For CO2 Released During Calcination

This document contains calculations related to CO2 released during the calcination process in a kiln. It provides the percentage of CaO and MgO in the kiln feed and uses this to calculate the CO2 released from the decomposition of CaCO3 and MgCO3. The total CO2 released is calculated to be 35.37% by weight or 18.01% by volume. It also includes calculations to determine the moisture and exhaust gas composition from both the calcination process and combustion of coal as fuel in the kiln.

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D N SHARMA
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276 views4 pages

Calculation For CO2 Released During Calcination

This document contains calculations related to CO2 released during the calcination process in a kiln. It provides the percentage of CaO and MgO in the kiln feed and uses this to calculate the CO2 released from the decomposition of CaCO3 and MgCO3. The total CO2 released is calculated to be 35.37% by weight or 18.01% by volume. It also includes calculations to determine the moisture and exhaust gas composition from both the calcination process and combustion of coal as fuel in the kiln.

Uploaded by

D N SHARMA
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Calculation for CO2 released during calcination

CaO in Kiln feed 43.8


Then CaCO3 in Kiln feed 78.21 (43.8/0.56) Mol.wt
CO2 released from CaCO3 34.41 (78.21*0.44) CaO 56
MgO 40
MgO in Kiln feed 0.87 Al2O3 102
then MgCO3 in kiln feed 1.827 SiO2 60
CO2 released from MgCO3 0.957 Fe2O3 160

Total CO2 released from Kiln feed 35.37 % by wt.

Density of CO2 1.964 Kg/Nm3


then Volume of CO2 released 18.01 % vol.
0.01786
0.02500
0.00980
0.01667
0.00625
Coal Ultimate analysis Coal Proximate analysis
Mineral Matter 35.44 I.M. 2.66 64.56
C 47.15 Ash 33.58 73.03
H 2.94 VM 27.14 4.55
N 0.99 Fixed C 37.22 1.53
S 0.37 0.57
O 13.11 20.31

Calulation of moisture % in Kiln exit gas

Moistur% in Kiln exit gas = Moisture% in KF + Moisture% in Fuel (Coal)

Moisture % in KF = Kiln feed moisture% x KF: Clinker conversion factor


= 0.00448 Kg
= 0.006 Nm3

Coal combustion gases products are: (Coal consmp. = 0.158 kg coal/ kg clk )
Desription Fuel analysis Combustion products O2 equivalent
% Kg Kg Nm3 Kg
C 73.03 0.1154 CO2 0.4231 0.2154 0.30771
H 4.55 0.0072 H2O 0.0648 0.0806 0.05756
S 0.57 0.0009 SO2 0.0018 0.0006 0.00090
O 20.31 0.0321 O2 0.0321 0.0321
N 1.53 N2

Total O2 required for combustion = 0.33408 Kg


0.23386 Nm3
Total air required for combustion 0.880 Nm3

CO2 from calcination (considering 35.37% LOI) 0.547 Kg


0.279 Nm3
Total CO2 in kiln exhaust gas 0.494 Nm3
Total H2O in kiln exhaust gas 0.046 Nm3

Exhaust gas composition (with no excess air) Exhaust gas composition (with 10% excess air)
Nm3 % Nm3 %
CO2 0.494 34.78 CO2 0.494 34.22
H2O 0.046 3.23 H2O 0.046 3.18
SO2 0.00063 0.04 SO2 0.00063 0.04
N2 0.880 61.94 N2 0.880 60.94
O2 0.0234 1.62
Total 1.420 Total 1.444
O2 equivalent
Nm3
0.21540
0.04029
0.00063
0.02246

% excess air)

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