GHG排出削減のための高効率舶用排熱回収システムの開発(<特集>GHG)

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This research aims to develop a marine heat recovery system with a circulating fluidized bed (CFB) heat-exchanger. In general, exhaust gases from marine diesel engines contain soot and sulfuric oxides originating from the low quality fuel oils, so that recovering heat from exhaust gases is limited and heat exchangers are vulnerable. In this heat recovery system, heat is recovered efficiently from exhaust gas and the exhaust gas is desulfurized by the aid of circulating particles through the system. Therefore, the ship motion, such as rolling and inclination, may affect its performance through the change of gas-solid flow field in the CFB. Experiments and numerical simulations were conducted to investigate influences of the ship motion on the gas-solid flow in the CFB. Total pressure drop through the CFB and heat transfer at the riser wall were found to increase due to the rolling motion. Finally, a demonstration heat recovery system was manufactured and combined with a medium speed diesel engine in order to run verification tests. The following results were obtained, 1) Heat recovery performance of the system fell below the expectation. Although the target value of heat recovery was 8% of the engine output at 75% load, attained heat recovery was about 8% at 40% load, 6.7% at 50% load, and 5.4% at 65% load, respectively. 2) The total pressure drop through the CFB was three times as large as a designed value due to improper design of the distributor. 3) Solid particles newly developed in this research achieved 90% desulfurization of the exhaust gas.
独立行政法人海上技術安全研究所の論文
2010-03-26

GHG排出削減のための高効率舶用排熱回収システムの開発(<特集>GHG)

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