Economizer Functions In Boiler System
Industrial boilers are systems designed to produce steam in varying quantities for a variety of applications including steam supply, power generation, space heating, process heating, sanitation and others. For large boiler or small boiler, economizer is a crucial part.
Why boiler economizer is necessary?
It is reported that 96% of the cost of operating a boiler system comes from fuel costs, and in a typical boiler system, 10% to 20% of energy input is lost in the form of heat escaping to the atmosphere. The installation of a boiler economizer helps to solve this problem. An economizer is a unit that captures heat from the stack, and then returns it to a water system.
What’s the function of economizer in boiler?
Economizers must be sized for the volume of flue gas, its temperature, the maximum pressure drop allowed through the stack, what kind of fuel is used in the boiler, and how much energy needs to be recovered.
Boiler economizers reuse exhausted flue gas to pre-heat the feedwater entering the boiler. Essentially a mini-heat exchanger, economizers improve boiler performance while increasing fuel efficiency. By rapidly increasing feedwater temperature through captured flue gas, economizers also provide a significant improvement in steam generation and response time.
If the economizer would be used to heat boiler make-up water, it is necessary to determine the volume and temperature at the inlet of the economizer. The lower the amount of condensate return, the higher the volume of make-up water and the higher savings potential.
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