OPTIMISATION OF FLUE GAS CONDENSATION AT BIOMASS COMBUSTION PLANTS THROUGH INTEGRATION OF A DIRECT EVATORATION HIGH TEMPERATURE HEAT PUMP

摘要

Within the work described a new energy recovery technology based on flue gas condensation with arndirect evaporation industrial compression heat pump was developed. In a first step the flue gas condensation unitrnmainly consisting of the flue gas condenser / refrigerant evaporator and the compression heat pump were designedrnand different variants regarding system integration have been evaluated. For this purpose a design tool was developedrnto simulate the heat transfer from the condensing flue gas to the evaporating refrigerant. In a second step a pilot plantrnwas set up and a number of test runs under different conditions have been carried out. The measured data showedrngood agreement with the data derived from the design tool. An increase in efficiency of up to 14%-points (withrnrespect to the primary energy input, based on NCV) or up to 34%-points (with respect to the fuel energy input)rnrespectively, compared to a conventional biomass boiler plant without heat recovery have been achieved.