Horizontal flue gas condensing economizer
The flue gas entering the condensing economizer travels through two U-shaped channels, where nozzles are arranged to disperse condensate into the flue gas stream. The injected droplets are at a lower temperature than the flue gas, so they begin to absorb the thermal energy contained in the flue gasses during the heat and mass transfer process. Since the fuel is first dried in the combustion chamber (furnace, combustion stage I), a large amount of water is vaporized into flue gasses. Water vapor starts to condense as the flue gas temperature in the condenser reaches the dew point value. The formed condensate is collected and circulated through the heat exchanger (s). After condensate is cooled down, repeatedly sprayed into the flue gas flow.
The flue gasses in the unit can be cooled from 180 ° C to 45˚C ÷ 65˚C depending on the humidity of the fuel (as the humidity of the fuel increases, the efficiency of the condenser increases).