Steam Production

In a fuel fired boiler, chemical energy in the fuel is converted into heat in the furnace and the function of the boiler is to transfer this heat to the water in the most efficient manner


This heat is transfer to the water in the boiler by radiation, conduction and convention

-When heat is added to water, its temperature rises at a rate of 0.56°C (1°F) for each heat input of 2.095 kJ/kg (1 Btu/lb)


-If we take water at 0°C (32°F) and we add 419 kJ/kg (180 Btu/lb) then we will increase the temperature of the water by 100°C (180°F)

-This rise in temperature can be detected and is called Sensible Heat (Specific Enthalpy -Water)

Steam Uses:

Space heating


Drying -paper mill

Process heating

Sterilization

Shipping

Power generation

Steam Quality

Steam quality relates to the quantity of moisture present in the steam


100% quality specifying no moisture content

0% quality specifying all liquid

Liquid droplets entrained in the steam leaving a boiler contain dissolved solids