Steam Boilers, Engines, Nozzles and Turbines
In regenerative air preheaters, the heat is transferred

By direct mixing
Heat is transferred by bleeding some gas from furnace
From heating an intermediate material and then heating the air from this material
From a metal wall from one medium to another

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Steam Boilers, Engines, Nozzles and Turbines
Which is not the correct statement about moisture in coal?

Inherent moisture and surface moisture are different things
It increases thermal efficiency
Some moisture in coal helps in better burning which is not possible with completely dry coal
In some coals moisture may be present up to 40%

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