Evaluation of Reclaiming Technology for Gas-fired Boiler Flue Gas Residual Heat

A seires of calculations are carried out to explore the thermal efficiency performance during flue gas condensation based on natural gas boiler model,the relationships of gas boiler thermal efficiency with the flue gas temperature,air factor are performed.It is meaningfully to recover the flue gas thermal energy if temperature of the flue gas tube is below the saturation temperature of the vapor,which could be implemented by adding a comdensation energy heat-exchanger.The several structures of condensing heat transfer equipment are discussed on heat transfer,flow resistance and low temperature corrosion.