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What is steam boiler?

A boiler can be defined as a closed vessel in which water or other fluid is heated under pressure. This fluid is then circulated out of the boiler for use in various processes or power generation. In the case of power generation steam is taken out of the steam boiler at very high pressure and temperature.

Fire tube boilers have almost become extinct; however this can be classified as

• Locomotive boilers, which ruled rail transportation before diesel and electric engine came.
• Industrial boilers, mainly used for green projects where initial steam is required
• Domestic use boilers

Water tube boilers took over when size and capacity increased. This can be classified depending on type of circulation used to generate steam as

• Natural circulation boiler
• Forced circulation boilers
• Super critical pressure boilers or zero circulation boilers

Depending on type of firing adopted in boilers they can be classified as

• Stoker fired
• Pulverized coal fired
• Down shot fired
• Fluidized bed boilers
• Cyclone fired
• Chemical recovery boilers
• Incinerators

Boilers can be classified based on the type of fuel used as

• Coal fired boilers
• Oil fired boilers
• Gas fired boilers
• Multi-fuel fired
• Industrial waste fired boilers
• Biomass fired boilers

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