モノエタノールアミン水溶液を用いたCO_2分離装置を持つ熱機関の性能

概要

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With regard to CO_2 recovery from exhaust gas of combustion engines, a systems analysis is performed for a diesel engine and a gas turbine of 10,000kW class with a packed column CO_2 separator using aqueous monoethanolamine (MEA) solution. A CO_2 mass transfer calculation model verified on the basis of the authors' experiments for a packed column CO_2 absorber and stripper is used in the analysis. Effects of operating parameters, such as gas and liquid feed rates of the CO_2 separator, stripping temperatures, the highest loading factors, and MEA concentrations of the solution, on the performance are presented with the calculation model. Performances of the diesel engine system and the gas turbine system are evaluated in terms of net output power, CO_2 recovery ratios, and volume of the packed columns for the absorber and the stripper. Primary results are : (1) using the rejected heat of combustion engines for CO_2 recovery is an effective mean ; (2) CO_2 recovery from the engines at a thermal efficiency of 50% reduces the efficiency and results in 42% of thermal efficiency at 80% of CO_2 recovery ratio ; (3) attainable maximum CO_2 recovery ratio is constrained by the mole ratio of steam fed in the stripper to CO_2 in the exhaust gas and the mole ratio of the CO_2 to MEA in the solution ; (4) heights of the packed columns result in around 1 meter, while the diameters around 3 to 6 meters.
独立行政法人海上技術安全研究所の論文
1998-05-13