what is the role of economizer in a boiler?
The term economizer can be used to describe several devices that use the waste heat from the stack gases to either preheat the air, preheat the fuel or preheat the boiler feedwater. It all depends on where it will work best in a given boiler.
Priya, the term economizer has different meanings by different boiler manufacturers, but it is usually applied to a system or process designed to increase the fuel-use efficiency of the boiler. For example, in some systems using heavy heating oil as fuel, the economizer preheats the oil so that it burns more completely. In some natural gas-fired systems, the economizer regulates the gas pressure to maximize the heat produced. In essence, the economizer maximizes the BTU's produced per unit of fuel consumption by acting on the fuel source. Hope this helps - CQ
