End Use
Power Generation
Steel Making
Cement
The determination of the Value in Use for a coal depends on how the coal properties influences the performance  which requires a knowledge of the particular technology and the role coal plays.
The main factors that control Value in Use for different end uses are:
  • Power generation- $ per Giga Joule of useable energy ($/GJ), where the useable energy is normally determined on a net basis ( gross calorific value less energy loss due to evaporation of the as-fired moisture and water formed in combustion) subject to the constraints:
    • acceptable burnout of the carbon
    • acceptable flame stability
    • emissions (NOx, SOxand particulates) within limits.
    • Coking- $/ % net Carbon.Blending of coking and semi-soft coking coals is extensively carried out to maximise the coke yield, coke strength and minimise costs.  The coke yield  from the coke oven is dependent on the volatile matter of the coal blend whereas the coke strength  is strongly influence by the plasticity  on the component coals.
    • PCI- Replacement Ratio  is the amount of coke replaced by the injection of coal into the base of a blast furnace.
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