Theoretical Calculation of Calorific Values

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The calorific value of a fuel can be calculated from the sum of the calorific values of the constituent gases.

According to Dulong, the calorific value of fuel is the sum of the calorific values of its constituent elements.

The higher Calorific value of some of the chief combustible constituents of fuel are given in the following table.

Calculation of Calorific Values

Calorific Values of Fuel Constituents

Constituent Hydrogen Carbon Sulphur
H.C.V                       k.cals/kg or cals/gm 34,500 8080 2240

When 1kg of the fuel is burnt completely Dulong’s formula for GCV is written as

Dulong formula

The quantity of hydrogen in combination with oxygen will not take part in the combustion reaction. So, the surplus hydrogen available for combustion is \left[\mathrm{H}-\frac{\mathrm{O}}{8}\right] .

\text { LCV }=\text { GCV }--\frac{9}{100} \times \mathrm{H} \times 587 \mathrm{kcal} / \mathrm{kg}

This is based on the fact that 1 part of  gives 9 parts of H2O and the latent heat of steam is 587 cal/gm . In the above Dulong’s formula C,H,O and S represent the percentage of the corresponding elements.

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