Coal blending in
power station is mainly adopted to reduce the cost of generation and increase
availability of coal. The low-grade
coals can be mixed with better grade coal without deterioration in thermal
performance of the boiler thus reducing the cost of generation. Many nations, blending of coal were being
adopted for a very long period mainly for increasing the availability of coal
for power generation. To improve the
availability of coal and also to improve the calorific value of coal being
fired, some of the power stations look at the possibility of mixing high grade
imported coal with the low grade high ash coals.
There are many
methods adopted for blending which can be at Coal Mines, Preparation Plants,
Transshipment point and Power Stations.
The method to be chosen will depend upon the site conditions, level of
blending required, quantity to be stored and blended, accuracy required and end
use of blended coal. Normally in large
power stations, handling very large quantity of coal, the stacking method with
fully mechanized system is followed.
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