Taking the flue gas as low temperature heat source of absorption heat pumps for heating,performs the energy efficiency reformation using the anti-corrosion type flue gas condensing heat recovery unit in a heating boiler room in Beijing.The field measurement results show that the exhaust gas temperature can be reduced from 84-114 ℃ to 27-43 ℃ with the efficiency of gas utilization(energy saving) increasing by 7%-14%;the latent heat of condensation of water vapor accounts for 68%-84% of the recovered total he...