Fuels and Combustion
Advantages of fluidised bed combustion are

High heat transfer rate
Lower furnace operating temperature
All of these
Reduced NOx formation in flue gas

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Fuels and Combustion
Froth floatation is used for

All of these
Washing fine coal dust (< 0.5 mm size)
Removing ash from the coal based on difference in specific gravity of coal and ash
Washing lump coal (> 80 mm size)

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