Question

A coal has the following composition by weight C = 90%, O = 3%, S = 0.5%, N = 0.5% and ash = 2.5%. Net calorific value of the fuel was found to be 8490.5 kcal/kg. Calculate the percentage of H and GCV.

Answer 1

The percentage of H is 4.575 % while the GCV IS 8732.06 kcal/kg.

Explanation:

Given,

C = 90%, O = 3%, S = 0.5%, N = 0.5%, and ash = 2.5%

NCV = 8490.5 kcal/kg

To find H,

HCV = LCV + 9 * H/100 * 587

HCV = 1/100 * (8080 * C + 34500 * (H - O/8) + 2240 * N)

H = (8490.5 - 7754.8)/(345 - 52.8)

H = 4.575%

Now,

GCV or HCV

= LCV + 52.8 * H

= 8490.5 + 52.8 * 4.575

GCV or HCV = 8732.06 kcal/kg

Learn more: Calorific Value

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