Steam Boilers, Engines, Nozzles and Turbines
Which is not correct statement about effect of sulphur in fuel?

It helps in electrostatic precipitation of ash in flue gases
It has heating value
It leads to corrosion of air heaters, ducting, etc. if flue gas exit temperature is low
It erodes furnace walls

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

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

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