Industrial Boiler - Basics, Types & Applications

Boiler construction is a famous work area in industrial construction. Boiler construction is purely developed as a mechanical industry but civil structural engineers do have their role in this field. Nowadays many civil supervisors are recruited for the boiler construction supervising and their related safety requirements. Any interest to get part in this business will make one to understand what is a boiler and their related properties. We will start learning one by one about boilers and their construction through each article.

What Are Boilers?

Boilers are units that will undergo the heating or boiling of water or a fluid. The fluid may either will get boiled or steamed based on the requirement. This fluid will leave the boiler to serve the purpose of the industrial unit. 

The Boiler will hold pressure through the generation of the steam. This pressure of steam is greater than 2bar in the boiler.

Applications of Boilers

The heated fluid from the boiler is used to serve many heating applications. These can be used for:

1. Power Generation
2. Water Heating
3. Cooking 
4. Sanitation
5. Central Heating

Classification of Boilers

The boiler classification is wide and is hence explained in the table below.

Sl.no	Category of Classification	Types
1	Based on fluid flowing in boiler Tubes	Fire/Some/Flue tube/Shell type Boilers
		Water Tube Boilers
		Combo boiler -Combination
2	Based on End Use	Industrial Boilers
		Utility Boilers
		Marine Boilers
		Nuclear Boilers
3	Based on Type of Firing	Stoer -Fired Boilers
		Burner Fired Boilers
		Mass/Pile Burning Boilers
		Bubbling Fluidised Bed Combustion (BFBC) Boilers
4		Circulating Fluidised Bed Combustion (CFBC) Boilers
		Pulverised Fuel (PF) Boilers
		Liquor -Fired Boilers
		Waste Heat Boilers
5	Based on Operating Procedure	Subscritical Boilers
		Supercritical Boiler(SC)
	Based on Circulation	Natural Circulation/Drum Type
		Forced Circulation Boilers
6		Once through (OT) or no-drum boilers
	Based on draft	Natural/balanced draft boilers
		Forced draft (FD) or pressurised fired boilers
	Based on construction	Package boilers
7		Field Erected Boilers
	Based on Support Type	Top Supported
		Bottom Supported
		Middle and girdle supported boiler
8	Based on furnace construction	Two pass boiler
		one and a half pass boiler
		single or tower type boiler
		down -shot boilers

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