1 Carbon 56.8

2 Hydrogen 3.7

3 Sulphur 2

4 Oxygen 7

5 Nitrogen 1.3

6 Moisture 12.5

7 Ash 16.7

S.no. Calculated Parameters Values1 Theoritical Air (kg/100kg of fuel) 759

2 Theoritical Oxygen requirement (kg/100kg of fuel) 176.11

3 Total Nitrogen (kg/100kg of fuel) 582.9

S.no. Particulars Values

1 Theoretical CO2 % for Bituminous Coal (% by vol.) 18.6

2 Considering Actual CO2 % for Bituminous Coal (% by vol.) 15

3 Excess Air (%) 24

4 Air for combustion after considering Excess Air (kg/100 kg of fuel) 941.16

Calculating Air requirement for a given Coal Ultimate Analysis

S No. Constituents % Compositon

Calculation of Excess Air

EA= Theoretical CO2%/Actual CO2 %

S.no. Particulars CO2 H20

1 Molecular Mass of each gas 44 18

2 kg of gas/100 kg of fuel 208.3 33.3

3 Moisture (kg/100 kg of fuel) 12.5

4 Specific Vol. at STP in m3/kg 0.51 1.25

5 Volume of gas/100 kg of fuel (Wet) 106.24 57.25

6 % by Volume (Wet) 16.84 4.96

7 Volume of gas/100 kg of fuel (Dry) 106.24 0

6 % by Volume (Dry) 18.52 0

S.no. Excess Air % 0% 10%

1 kg Air/100 kg of fuel 0 75.9

2 kg of Oxygen/100 kg of fuel 0 17.62

3 kg of Nitrogen/100 kg of fuel 0 58.29

S.no. Particulars CO2 H20

1 Molecular Mass of each gas 44 18

2 kg of gas/100 kg of fuel 208.3 45.8

3 Specific Volume at STP in m3/kg 0.51 1.25

4 Volume of gas/100kg of fuel (Wet) 106.24 57.25

5 % by Volume (Wet) 14.19 7.65

6 Volume of gas/100 kg of fuel (Dry) 106.24 0

5 % by Volume (Dry) 15.36 0

Products of Combustion

Table 1:- If only Theoretical Air is considered

Table 2:- Considering different amount of excess air the products of combustion shall vary

Table 3:- If Excess air is also considered lets say (20%)

SO2 N2 Total

64 28

4 582.9

0.35 0.8

1.4 466.32 631.21

0.13 42.49

1.4 466.32 573.96

0.25 81.25

20% 30% 40%

151.8 227.7 303.6

35.23 52.84 70.45

116.58 174.87 233.16

SO2 N2 O2 Total Remarks

64 28 32 As Known

4 699.48 35.23 Refering above 2 tables

0.35 0.8 0.7

1.4 559.59 24.67 749.15 As solved in Table 1

0.19 74.7 3.3 100

1.4 559.59 24.67 691.9

0.21 80.88 3.57 100

22.4/Mol. Mass of each gas

(2)+(3)*(4)

Products of Combustion

Table 1:- If only Theoretical Air is considered

Remarks

eg. C+O2--->CO2 i.e. 56.8+(8/3*56.8)

As per the Ultimate Analysis received

Table 2:- Considering different amount of excess air the products of combustion shall vary

Table 3:- If Excess air is also considered lets say (20%)

Remarks

Considering Previous values

Considering Previous values

Considering Previous values