niaz
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Niaz Bhai, is it possible to mix higher quality coal with lower quality coal & thereby make it a better combustible mix in the same way that one can mix Ethanol & Petrol in Brazil & elsewhere ?
Yes you can but no need. Coal is not burnt in an internal combustion engine.
In a normal coal based power station; at first coal goes thru mill where it is ground to very fine powder. Then it is mixed with hot air and blown into the furnace of the boiler where superheated high pressure steam is generated which in turn runs the turbines producing electricity. Spent steam is condensed and reused.
As you can see, coal is only used to generate heat in a boiler. Burning coal with low heat content only means that you need more of it. Of course you can mix anthracite or coke to improve quality. This would mean that you would use less fuel. But why bother, simply use more of the original feed.
By the way, delayed petroleum coke is one of the favourite alternate fuels for coal fired power plants. Only thing to remember is that fuels such as lignite and delayed petroleum coke have high sulphur content (4% or even more) and therefore flue gases require rigorous scrubbing to remove sulphur dioxide gas before the same can be released into the atmosphere.