To Different Bases
Desired Basis >
Given Basis v
|
As Received
|
Air Dried
|
Dry
|
Dry, ash free
|
Dry, mineral matter free
|
| As Received |
|
100-Mad
100-Mar |
100
100-Mar |
100
100-(Mar+Aar) |
100
100-(Mar+MMar) |
| Air Dried |
100-Mar
100-Mad |
|
100
100-Mad |
100
100-(Mad+Aad) |
100
100-(Mad+MMad) |
| Dry |
100-Mar
100 |
100-Mad
100 |
|
100
100-Ad |
100
100-MMd |
| Dry, ash free |
100-(Mar+Aar)
100 |
100-(Mad+Aad)
100 |
100-Ad
100 |
|
100-Ad
100-MMd |
Dry, mineral matter free
|
100-(Mar+MMar)
100 |
100-(Mad+MMad)
100 |
100-MMd
100 |
100-MMd
100-Ad |
|
Definition of Variables
M = moisture (%)
A = ash (%)
MM = mineral matter (%)
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
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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