Question

A coal sample on analysis gives the following result; C = 80%, H = 20%. Calculate gross calorific value.​

Answer 1

Answer:

Dulong's formula for calculating the calorific value is given as:

where C, H, O, and S are the percentages of carbon, hydrogen, oxygen and sulphur in the fuel respectively.

Formula for calculating the net calorific value:

C=80%, H=5%, O=4%, N=3%, S=3.5% and ash=5%.

Hence,

HCV = 0.01× [8080×80 + 34500×(5-4/8) + 2240×3.5] = 8094.9 kcal/kg

LCV = [8094.9 - 0.09×5×587] = 7830.75 kcal/kg

Answer: Net calorific value (LCV) of a coal is 7830.75 kcal/kg.

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Answer 2

Answer:

The gross calorific value for coal is 7830.75 kcal/kg.

Explanation:

The gross calorific value can be calculated by the Dulong's formula.

it is expressed by

1/100[8080C + 34500(H-O/8)+22400S]

C,H,O AND S are carbon,hydrogen, oxygen and sulphur respectively.

C is 80 percent.

The others are distributed as H=5%

                                                 O=4%

                                                  N=3%

                                                  S=3.5 %

                                                ASH= 5%

According to the formula

the high calorific value can be expressed as

0.01×[8080×80+34500×(5-4/8)+2240×3.5]

=  8094.9 kcal/kg.

the low calorific value is given by

[8094.9-0.09×5×587]

= 7830.75 kcal/kg.