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JordanThe Gross Calorific Value (GCV) of coal can be calculated using the Dulong formula: GCV (kJ/kg) = 337C + 1442(H2 - O/8) + 93S, where C, H, O, and S are the mass fractions of carbon, hydrogen, oxygen, and sulfur in the coal. Please ensure the units of the fractions are consistent for accurate results.
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How to calculate ncv from gcv of coal?
Net calorific value (NCV) can be calculated from gross calorific value (GCV) of coal using the formula: NCV = GCV - (0.09 * moisture content) for lignite and sub-bituminous coals, or NCV = GCV - (0.07 * moisture content) for bituminous and anthracite coals. The moisture content is usually provided on the coal analysis sheet.
What is dulong formula in coal analysis?
The Dulong formula in coal analysis is a method used to estimate the calorific value of coal based on its elemental composition. It calculates the gross calorific value (GCV) of coal by multiplying the percentage of carbon, hydrogen, and sulfur by their respective heating values and summing the results. The formula is: GCV (MJ/kg) = 337C + 1442(H - O/8) + 95S, where C, H, O, and S are the percentages of carbon, hydrogen, oxygen, and sulfur in the coal sample, respectively.
Difference in GCV and UHV of coal?
GCV (Gross Calorific Value) measures the total energy content in coal, while UHV (Useful Heat Value) considers only the heat value that can be practically utilized. UHV takes into account factors such as moisture and ash content that can impact the efficiency of energy conversion processes. Overall, UHV provides a more realistic indication of the usable energy in coal compared to GCV.
NCV and GCV of coal?
net calorific value and gross calorific value GCV to NCV conversion: - Using the following IPCC formulae determine the NCV of those fortnightly samples - NCV = GCV - 0.212H - 0.0245M - 0.0008O - Where H - Percentage of Hydrogen, M - Percentage of Moisture and O - Percentage of Oxygen (as determined from the ultimate analysis report) - Please note that here GCV and NCV are in Mega Joule/kg, therefore it is required to do the necessary unit adjustments (1kcal/kg = (4.186/10^3) = 0.004186 MJ/kg) Assuming GCV = 18.4017MJ/kg, O =9.23%, H = 3.63%, M=7.45% (Source: Coal analysis report conducted independent testing laboratory - ' National Council for cement and building materials')
What is the approximate chemical formula of coal?
The chemical formula of coal can be approximated as C135H96O9NS. This formula varies depending on the type of coal and its grade.
