CO{sub}2 recovery from diesel engines in a solar-hydrogen-methanol energy system

摘要

Concept of solar-hydrogen-methanol energy system for the transportation sector in Japan is outlined.In the system, methanol is produced with CO{sub}2 recycled and H{sub}2 produced by electrolysiswith photovoltaic power. Concerning CO{sub}2 recovery from the exhaust gas of a 10,000 kW diesel engine to be used inthe methanol energy system, the effects of CO{sub}2 recovery parameters such as gas and liquidflow rates, liquid concentration, and stripping temperature on the engine performance and theattainable CO{sub}2 recovery ratio are analyzed on the basis of a mass transfer calculation model fora packed column with aqueous monoethanolamine solution. Heat rejected from the engine is used forCO{sub}2 recovery, but reduction in the engine output power is not avoidable, which is mainlycaused by the shortage in power of turbocharger and the supplemental supercharging power. Boththe maximum attainable CO{sub}2 recovery ratio and the reduction in the engine output powerdepend on the ratio of the stripping steam feed rate to the flow rate of the exhaust gas.