What is a Boiler?
The boiler is an important equipment of most industrial facilities and power plants. The boiler is a closed pressure vessel used to produce high pressure or low-pressure steam or to produce hot water for industrial or domestic use. Industrial steam boilers are classified in too many ways.
Boiler Types According to tubing methods
There are two main types of boiler Fire tube boilers and water tube boilers.
Fire tube boilers are those boilers in which fire or flue gases are inside of the tubes and water is on the shell side. Fire Tube Boilers are low capacity low-pressure boilers usually used for heating, processor to produce hot water.
The arrangement in the Water tube boiler water is that the water is contained inside the tubes while the hot combustion gas flows on the other side of the tubes. water tubes boilers produce high-pressure steam which is used for power generation purposes. water tube boilers are more efficient and less dangerous than fire tube boilers. Mostly Fire tube boilers are of Package type boilers they produce less amount less pressure of steam than water tube boilers.
Boiler types According to the type of fuel used or fuel-burning methods
Coal-fired boilers, oil fired boilers, gas-fired boilers, Biomass boilers, electric boilers Circulating Fluidized bed boiler (FBC Boiler), Pulverized coal boiler (PC Boiler), and Waste heat recovery boilers Nuclear Steam generators.
Boiler types According to steam Pressure
Low-pressure Boilers, Medium Pressure Boilers, and High-Pressure boilers.
According to ASME there every boiler have pressure above 15 PSI is called a high-pressure boiler. but generally, Low-pressure boilers having pressure below 300 psi (Bulk Boiling). Medium pressure Boilers having a pressure range between 300 psi to 800 psi (mixed Nucleate or bulk Boiling). Boilers having Pressure above 800 psi (film Boiling) are called High pressure Boilers.
According to the use of steam
Process boilers, Utility boilers, and Marine boilers are examples of these types of boilers.
If the steam used for process the is called process boiler. Utility boilers are used to generate electricity in power plants they are usually water tube type boilers.
According to use of boiler
Stationary and portable boilers, there are some boilers that are not stationary like Locomotive Boilers and Marine boilers.
According to the furnace position
Externally fired boilers and internally fired boilers. Some boilers have their furnace outside the boiler are called externally fired boilers.
According to the axis of the shell
Vertical and horizontal boilers. example of a vertical boiler is the simple vertical boiler, Cochran boiler. Horizontal boilers are Cornish boiler, Lancashire boiler, and Locomotive Boiler
According to the No. of tubes in boilers
Single tube and multi-tube boilers. Single tube boilers like Cornish boiler and simple vertical boiler. These boilers have very low efficiency.
According to the circulation of water and steam in boilers
Boilers are also classified as Natural circulation boilers and forced circulation boilers. The natural circulation limit is 140 Kg/cm2 above this pressure forced circulation is adopted.
According to the name of makers company names
Some companies make boilers like Babcock and Wilcox boiler and Cochran boiler. These boilers are famous for their brand names.