Abstract: The liquid ammonia pressurized supply and ammonia capture are carried out based on the demand of ship main engine powered by ammonia fuel. The current study firstly sets up a three-stage pressurized supply mode with a buffer tank, and then analyzes and simulates the key points such as the form of fuel tank, stepped pressurization, elimination of pipeline gas resistance, inerting explosion prevention and ammonia emission capture. The simulation results show that the backflow pressure of the fuel is within the preset range, and this design can achieve stable supply to the main engine after pressurization and temperature increase, and can achieve the effective capture and process of ammonia emissions. The system analysis shows that it is feasible and stable to adopt the semi-cooled and semi-pressurized fuel tank, combined with a two-stage pump and a buffer tank, forming a three-stage pressurization system. The use of water mist spraying combined with adsorbers can effectively capture the ammonia and control ammonia emissions within 22.8 mg/m³.

Key words: ammonia fuel, computational fluid dynamics（CFD) simulation, supply system, stepped pressurization, ammonia capture

摘要： 该文基于氨燃料动力的船舶主机需求,展开液氨加压供给和氨捕捉设计。文中设置三段式增压并具有缓冲罐的供给方式,针对燃料罐形式、阶梯加压、消除管路气阻、惰化防爆以及氨排放捕捉等关键点展开分析和仿真计算。仿真结果显示,燃料回流汇入压力在预设区间内,该设计可实现增压增温后稳定供给主机,且有效实现氨排放的捕捉和处理。系统分析表明：采用半冷半压式燃料罐,结合两级泵和缓冲罐,组成三段式增压,具有可行性和稳定性;而采用水雾喷淋结合吸附器可有效捕捉氨和控制氨排放在22.8 mg/m³内。

关键词: 氨燃料, 计算机流体力学仿真, 供给系统, 阶梯加压, 氨捕捉