Steam Boilers, Engines, Nozzles and Turbines
Which is not correct statement about the function of furnace?

Separate ash from coal
Mix fuel with air and ignite
To provide proper conditions for continuous complete combustion
Maintain heat supply to prepare and ignite the incoming fuel

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Steam Boilers, Engines, Nozzles and Turbines
In designing air preheaters, the important design consideration is that

Heat transfer area should be optimum
Stack gases should not be cooled to the dew point
Approach temperature should be as low as possible
Handling and maintenance should be easier

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