하이브리드 기반 암모니아 연료 추진 선박에서의 분해 조건에 따른 시스템 특성 분석

다국어 초록 (Multilingual Abstract)

The reduction of air pollutants and GHG(Greenhouse gas) emissions has become a critical objective in response to strengthened international environmental regulations. To achieve this, alternative low-carbon and carbon-free fuels such as methane, ammonia, and hydrogen, as well aselectrification technologies including fuel cells and batteries, are being extensively explored in the maritime sector.This study proposes the design and evaluates the performance of a
hybrid ammonia-fueled ship propulsion system integrated with a SOFC(Solid oxide fuel cell), using the process simulation software UniSim design. Ammonia decomposition reaction was carried out via catalytic decomposition employing a ruthenium-based catalyst, with operational parameters maintained within a temperature range of 300–550°C and a pressure range of 1–10 bar across all cases. Three system configurations were analyzed. Case 1 involved a baseline
propulsion system utilizing ammonia LFSS(Low flashpoint fuel supply system). Case 2 incorporated a hybrid configuration wherein hydrogen, produced from ammonia decomposition reaction, was supplied to a SOFC to generate supplemental electric power. Case 3 introduced an integrated system where unreacted hydrogen and nitrogen from the decomposition reaction and combustion processes were re-synthesized into ammonia through the Haber–Bosch process.
A parametric analysis using the case Study function in UniSim design was conducted to assess the effects of reactor operating conditions on system performance. The optimal FSR(Fuel split ratio) was identified as 0.65. In addition, through the environmental impact analysis in Case 2 compared to Case 1, it was found that the fuel distribution had a minimum value of 693,600 kg CO2 eq at 0.9 points.