Abstract
Two CO2-recovering cogeneration systems S-A and S-B are proposed for district heating and cooling which emit no pollutants such as NOx and SOx: S-A is a system constructed on the base of a closed dual fluid gas turbine cogeneration system and S-B a closed combined-cycle cogeneration system, both being able to be realized by combining conventional technologies. It has been estimated from the simulation results that the maximum net power generation efficiency of S-A and S-B is 31.9% and 35.3%, the maximum net heat generation efficiency is 62.7% and 35.7%, respectively. It was shown that S-A and S-B can reduce the amount of CO2 emission by 95.7% and 96.0%, respectively, compared with the case where electric and heat energy are separately supplied by using the conventional systems, although the fuel comsumption rate are 7.12% and 12.4% high, respectively. It was also shown that S-A and S-B can save fuel comsumption by 16.9% and 9.92%, respectively, compared with the case where the CO2 generated is removed and recovered from the stack gas in the conventional systems by using a chemical solvent.
