Marine Closed Gas Turbine and LNG Refrigeration System Study. Executive Summary.

摘要

A conceptual design study was conducted to develop a family of closed gas turbine engines satisfying many marine applications. Complete engine systems,including rotating group,heat exchangers,heat source,and control system were designed for both 9000hp auxiliary electro-mechanical units,and small craft propulsion engines and also for 40,000, 60,000and 80,000hp helium cycle ship's propulsion engines. Further studies conducted revealed the closed gas turbine installations to offer definite economic advantages to the maritime industry,compared to steam,diesel or open cycle gas turbine plants. A second design study was conducted to analyze systems to control cargo boil-off from LNG tankers and to assess the impact of such systems on the economics of these tankers. Reliquefaction and subcooling approaches were considered using nitrogen-cycle reverse Brayton machines. Elimination of LNG boil-off was found to be feasible and economical provided the ratio of LNG cost to fuel oil cost was high.