Steam Boilers, Engines, Nozzles and Turbines
Equivalent evaporation of water is the evaporation for a feed water supply at 100°C

Conversion into steam at the same pressure at which feed water is supplied
Conversion into steam at atmospheric condition
And its corresponding conversion into dry steam at desired boiler pressure
And its corresponding conversion into dry saturated steam at 100°C and 1.033 kg/cm²

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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
Explosion in furnace
All the fuel burns instantaneously producing high energy release
Fuel burns with less air

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Steam Boilers, Engines, Nozzles and Turbines
The ultimate analysis of fuel lists

Various chemical constituents, carbon, hydrogen, oxygen etc, plus ash as percents by volume
Fuel constituents as percents by volume of moisture, volatile, fixed carbon and ash
Fuel constituents as percents by weight of moisture, volatile, fixed carbon and ash
Various chemical constituents, carbon, hydrogen, oxygen, etc, plus ash as percents by weight

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