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Coal Conversion

    

COAL ENERGY CONVERSIONS

GIVEN BASIS DESIRED BASIS
As Received Air Dried Dry Dry, Ash Free
As Received -
Air Dried -
Dry -
Dry, Ash Free -
Definition of Variables  
  M moisture in %
  A ash in %
Definition of Subscripts  
  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

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