预混氢/氨对船用发动机燃烧和排放性能的影响

Effect of Premixed Hydrogen/Ammonia on Combustion and Emission Performance of Marine Engines

为了减少内燃机领域的碳排放,降低全球变暖的速度,从柴油机的功率、燃烧和排放性能等方面考察预混氢/氨燃料在高压共轨船用柴油机上应用的可行性。结果表明:随着预混氢/氨混合燃料中氨燃料比例的增加,柴油机的缸内压力峰值和缸内温度峰值升高,但柴油机的功率下降明显。氨燃料的燃烧特性较差,当氨的比例大于60%后,柴油机功率下降更为明显。使用预混氢/氨混合燃料燃烧模式后,柴油机CO_(2)排放大幅降低。当掺氨比例较小时,soot和NO_(x)排放波动较小,CO和N_(2)O排放逐渐升高;当掺氨比例大于50%时,CO、soot、N_(2)O和NO_(x)排放大幅降低。综合考虑柴油机的整体性能,H30/A70被选为最佳的氢/氨混合比例。研究结果可为内燃机减碳提供方向。

In order to reduce carbon emissions in the field of internal combustion engines and reduce the speed of global warming,the feasibility of using premixed hydrogen/ammonia fuel in high-pressure common rail marine diesel engines is investigated from the aspects of diesel engine power,combustion,and emission performance.The results show that as the proportion of ammonia fuel in the premixed hydrogen/ammonia mixture increases,the peak pressure and temperature in the cylinder of the diesel engine increase,but the power of the diesel engine decreases significantly.The combustion characteristics of ammonia fuel are poor,and when the proportion of ammonia exceeds 60%,the power of the diesel engine decreases more significantly.Using premixed hydrogen/ammonia mixed fuel combustion mode,the CO_(2)emissions of diesel engines are significantly reduced.When the proportion of ammonia added is small,the fluctuation of root and NO_(x) emissions is small,while CO and N_(2)O emissions gradually increase;When the proportion of ammonia added is greater than 50%,the emissions of CO,soil,N_(2)O,and NO_(x) are significantly reduced.Considering the overall performance of the diesel engine,H30/A70 is selected as the optimal hydrogen/ammonia mixture ratio.The research results can provide direction for reducing carbon emissions in internal combustion engines.