According the combustion theory, fist law of thermodynamics and gas law, analyses are made on the dew-point temperature, saturated humidity and enthalpy of flue gas of combusted natural gas. The calculating equations for these parameters are derived and the corresponding calculating results are given in patterns of curves, which can be used as the base for recovery waste heat from flue gas of natural gas. A new technical flow chart is put up what have a heat exchanger and three parallel heat pumps. Basing on it the actual COP of each heat pump can exceed 3 in winter. If the flue gas temperature is cooled down from 100°C~200°C to 40°C~30°C, the use of the sensible heat and latent heat of partial condensation of flue gas can be at a high level, and the thermal efficiency of natural gas can be raised 10%~20%.
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How to cite this article
Tian, G. and Li, X. (2005). 'Recovery Waste Heat from Flue Gas of Natural Gas by Heat Pump'. SET Proceedings, 4(1), pp. 538-542. https://doi.org/10.65582/set.2005.119
