Steam Boilers, Engines, Nozzles and Turbines
Spontaneous combustion is a phenomenon in which

Coal bursts into flame without any external ignition source but by itself due to gradual increase in temperature as a result of heat released by combination of oxygen with coal
Fuel burns with less air
Explosion in furnace
All the fuel burns instantaneously producing high energy release

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

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Steam Boilers, Engines, Nozzles and Turbines
Stoichiometric quantity of air is the

Air present in atmosphere at NTP conditions
Air required for complete combustion of fuel with no excess air
Air required to convert CO into CO₂
Air required for optimum combustion so as to have reasonable excess air

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