Measurement and analysis of boiler flue gas heat deep recovery in an energy efficiency reformation project

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 heat; the energy saving rate is 1.4%-3.2% for each 10 ℃ dropping of smoke temperature; flue gas condensate water of 0.8-3.0 tons for recycling use is produced for 1 t/h of boiler capacity per day; moreover, the condensate water has a significant effect of flue gas purification. Concludes that, there is a huge potential for energy saving, water saving and emission reduction by reusing the waste heat of the low temperature flue gas.