Development on energy saving technology for flue gas carbon dioxide recovery by the chemical adsorption method and steam system in power plant

Abstract

How to reduce the energy required for CO{sub 2} recovery is one of the most important points in recovering CO{sub 2} from flue gas according to the chemical absorption methods. Previously the authors reported the performance and characteristics of KS-2, an energy-saving absorbent, at ICCDR-3 in Cambridge, MA, USA, and, at the same time, discussed a power generation plant and an optimum steam system for CO{sub 2} recovery as well as their calculation methods. The improvement of energy-saving absorbents has continued and the KS-3 absorbent has been developed. This can achieve better energy-saving than the previous KS-1 and KS-2. This paper reports on the performance of KS-3 an amine, and also the evaluation of the effect of SO{sub x} and dust contained in coal firing boiler flue gas on the absorbent and the method of their treatment. A steam system requiring minimum modification of the existing power plants to recover CO{sub 2} is described, along with a steam system in an LNG combined cycle. 2 refs., 8 figs., 3 tabs.