Abstract:

In order to investigate the characteristics of marine methanol powers and provide calibration data for modeling simulation studies， a marine methanol-diesel dual fuel engine was subjected to propulsion characteristics tests. The economy， combustion performance and emission performance of the engines were compared under pure diesel mode and dual fuel mode. The results show that the addition of methanol has a small effect on the equivalent fuel consumption of the engines， but it may reduce the unit power cost by 18.22% at most under the same operating conditions； the addition of methanol leads to the shortening of the combustion duration and the reduction of the average effective pressure at each operating point； the CO and HC emissions of the engines under the dual-fuel mode are higher than those of under the diesel mode， and the NO _x emissions under dual-fuel mode are slightly higher than those of the diesel mode only at high loads.

Key words: marine methanol power, propulsion characteristic, economy, combustion performance, emission performance

摘要：

为了探明船用甲醇动力的特性并为建模仿真研究提供校核数据，对一台船用甲醇-柴油双燃料发动机进行了推进特性试验，对比了发动机在纯柴油模式以及双燃料模式下的经济性、燃烧性能及排放性能。研究结果表明，甲醇的加入对发动机的等效燃料消耗量影响较小，但同工况下最多可以降低18.22%的单位功成本；甲醇的加入会导致各工况点下的燃烧持续期缩短、平均有效压力降低；双燃料模式下发动机的CO与HC排放均高于柴油模式，双燃料模式下的NO _x 排放仅在高负荷时略高于柴油模式。

关键词: 船用甲醇动力, 推进特性, 经济性, 燃烧性能, 排放性能