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ar as received basis | ad air dried basis | d dry basis
Specific Energy Conversions
For conversions between units
1 btu/lb = 0.002326 mj/kg
1 kcal/kg 0.0041868 mj/kg
1 metric ton (tonne) 1.10231 short tons
From GAR to NAR
The difference between net and gross as received (NAR v/s GAR) specific energy values is the latent heat of the water vapour which lowers the effective calorific value in the boiler. To convert from GAR to NAR for bituminous coals subtract approximately
1.09 mj/kg
260 kcal/kg
470 btu/lb
Knowledge = Power…
Coal Basics
A picture is worth a thousand words.
Select a term from the list
=coal that includes TOTAL MOISTURE, ASH, VOLATILE MATTER, and FIXED CARBON
Coal preparation
Coal preparation covers the physical and mechanical processes which can be applied to coals to make them suitable for the market. Mostly, this is applied to run-of-mine coals to obtain lower ash and more consistent coals suitable for steam raising or coke making. The yield of such a treatment process is the ratio of the mass of product to the mass of starting material. The organic efficiency of the process.is the ratio of the mass of the organic material in the product to the mass of the organic material in the starting material. The organic material is usually defined as the total material, less moisture and mineral matter.
