Steam Generator(Boiler)

2-Steam output:
A-Small capacity (m_s ) ? <10 ton/hr
B-medium capacity 10 < (m_s ) ? <50 ton/hr
C-High capacity 50 < (m_s ) ? <150 ton/hr
D- Super high capacity (m_s ) ? >150 ton/hr


Content:
1-Water container 2-Heating device

Steam Formation And Thermal Efficiency Improvement Methods:
1-Superheated steam:
Wet steam is passed through the superheated which consist of along tube or series of tube suspended across the path of the hot gases from furnaces .The degree of superheat is controlled by injection of water or steam in the superheated steam.


2-Reheater:
An improvement of cycle thermal efficiency can be achieved by installation of a reheater, to avoid wet steam in the low-pressure stages of the turbine.
3-Economizer:
The flue gases are passed into the economizer, which is a heat exchanger to heat feed water into the boiler.
4-Air preheater:
The flue gases are still hot, further efficiency improvement can be obtained by passing then into the air heater which is a heat exchanger used to heat the air ducted to the furnace to get high furnace temperature ,more steam and hence high efficiency.
5-Attemperator:
In which the steam temperature is reduced by removing heat from the steam:
1-Tubular type: in this case, the boiler water is used as a cooling medium.
2-water injection: water from the boiler is sprayed directly into the steam .This water is evaporated ,hence the temperature of mixture is reduced.