The gas boiler economizer is mainly composed of flue heat exchanger, thermal insulation regulating water tank, circulating water pipeline, hot water circulating pump, solenoid valve, electrical control and monitoring and display system. Without changing the original body of the boiler, a flue gas heat exchanger is installed at the exhaust outlet to reduce the exhaust gas temperature of the boiler to a low enough level, and the superheated water vapor in the flue gas will condense, and through heat exchange It absorbs the physical sensible heat in the exhaust smoke and the latent heat of vaporization released by the condensation of water vapor.
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