The boiler system comprises of: feed water system, steam system and fuel system.
- The feed water system provides water to the boiler and regulates it automatically to meet the steam demand. Various valves provide access for maintenance and repair.
- The steam system collects and controls the steam produced in the boiler. Steam is directed through a piping system to the point of use.
- Throughout the system, steam pressure is regulated using valves and checked with steam pressure gauges.
- The fuel system includes all equipment used to provide fuel to generate the necessary heat. The equipment required in the fuel system depends on the type of fuel used in the system. A typical boiler room schematic is shown in Figure.
Figure: Boiler Room Schematic
The water supplied to the boiler that is converted into steam is called feed water.
The two sources of feed water are:
(1) Condensate or condensed steam returned from the processes and
(2) Makeup water (treated raw water) which must come from outside the boiler room and plant processes.
For higher boiler efficiencies, the feed water is preheated by economizer, using the waste heat in the flue gas.