SET Proceedings 2978-4387 Caravel Press 10.65582/set.2005.119 2005.119 Recovery Waste Heat from Flue Gas of Natural Gas by Heat Pump TianGuansan LiXingquan School of Thermal Energy Engineering, Shandong University of Architecture and Engineering 23092005 4 1 978-7-112-07718-2 538 542 23 September 2005 © 2005 Copyright WSSET 2005

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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