TY - JOUR
TI - Increase of thermal efficiency of cogeneration plant by waste heat utilisation with absorption heat pump
AU - Zarzycki Robert
AU - Panowski Marcin
JN - Thermal Science
PY - 2019
VL - 23
IS - 14
SP - 1101
EP - 1112
PT - Article
AB - The very rapid growth of share of electricity generation from renewable  sources is observed recent years. However, even if that share reaches about  50% in 2050, almost 50% of electricity will still be generated based on  fossil fuels combustion rather than on nuclear energy. That means, energy  generated from coal will still be important for the next decades. The  largest sources of energy loses within the steam power plant is the steam  cooling system. The energy dissipated to the atmosphere in that system is  very difficult to be utilized mainly due to the relatively low temperature,  and its direct utilization without additional equipment is rather  impossible. The large amount of energy lost to the environment leads to low  overall thermal efficiency of the plant, therefore, utilization of this  energy should be of primary importance. The paper shows concept of  increasing efficiency of cogeneration plant thermal cycle by utilisation of  waste heat from flue gas with absorption heat pump, for the purpose of  system heat generation. Calculations of combined system of power plant  fuelled with biomass fuel with implemented waste heat utilisation system  were performed for one heating season and different moisture content in the  fuel. Results show, that owing to waste heat utilization instead of  conventional heat exchanger, additional electricity generation during the  heating season at even 46864 MWh may be achieved which is over 18% more for  the moisture content in the biomass fuel at 0.5 kg/kg, the same ambient  conditions and heat generation.