Types of Economizers
In a boiler, the flue gas is the heated gas that exits the boiler via an exit duct known as the flue. The escaping hot gas is a site of heat loss in the boiler system. Non-condensing economizers work through a basic heat exchange process. They consist of a heat exchange mechanism situated in the flue and are usually finned coils or tubes. As the hot exhaust gases pass across the heat exchange mechanism, heat transfers to the coiled mechanism. The recaptured heat increases the feedwater temperature entering the boiler. As the captured energy heats the feedwater, less fuel is needed to heat the water to the required boiling temperature.
Non-condensing economizers do not lower the flue gas temperature to below its acid dew point (the temperature, at a given pressure, at which gaseous acids such as SO2 in the flue/exhaust gas will start to condense into liquid acid). Depending on the boiler’s fuel, the resulting condensation can contain particles capable of corroding the flue. Keeping the temperature above the condensation point avoids the problem of potentially corrosive compounds.
Condensing economizers take advantage of a straightforward heat exchange process to recapture the heat escaping in the boiler’s exhaust fumes. Condensing economizers lower the temperature of the flue gases to below their dew point—the point to which the gases need to be cooled to condense from gas to liquid. The process takes advantage of a property known as enthalpy. The exhaust gases transfer energy to the heat exchanger, and the resulting temperature drop causes vapor in the exhaust gas to condense and collect on any surface in the economizer. This results in condensation building up in the economizer that must drain. This allows the exhaust gases reclaim a larger proportion of energy.
All Miura boilers use non-condensing economizers. For full schematics and specifications please reach out to our sales team HERE.
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