School of Automobile and Traffic Engineering, Wuhan University of Science and Technology, Wuhan, Hubei, 430065, China.
School of Automobile and Traffic Engineering, Wuhan University of Science and Technology, Wuhan, Hubei, 430065, China.
Environ Res. 2024 Nov 15;261:119530. doi: 10.1016/j.envres.2024.119530. Epub 2024 Jul 14.
With stringent regulations of internal combustion engine on reducing CO emission, ammonia has been used as an alternative fuel. Investigating how engine-related performance is affected by partial ammonia replacement of diesel fuel is essential for understanding the combustion. Therefore, in this study, a three-dimensional numerical simulation model is developed for the burning of two fuels of diesel and ammonia based on relevant parameters (i.e., compression ratio, load, ammonia energy fraction, etc.) in a lab-made diesel engine. The consequences of load and compression proportion on combustion and pollutant emissions are investigated for ammonia energy fractions between 50% and 90%. When the ammonia portion rises, the increased ammonia equivalent ratio causes ammonia to move away from the dilute combustion boundary and accelerates the combustion rate of ammonia. An increase in compression ratio significantly increases the specified thermal performance and combustion efficacy. When the compression ratio is 16, as the ammonia energy fractions increases, due to the increase in the proportion of ammonia, that is, the proportion of nitrogen atoms increases, more NOx is generated during the combustion process. When the ammonia substitution rate is 90%, as the compression ratio increases, the cylinder pressure and temperature increase. The combustion efficiency of ammonia increases, generating more NOx and NOx emissions can reach 0.66 mg/m. At a compression ratio of 18, the NOx emissions can reach 1.59 mg/m. However, under medium and low load conditions, as the ammonia fraction increases, the total energy of fuel decreases, and the combustion efficiency of ammonia decreases, resulting in a decrease in the heat released during combustion and a decrease in NOx emissions. When the ammonia substitution rate is 90% and the load is 25%, NOx emissions reach 0.1 mg/m. This research provides theoretical suggestions for the profitable and use ammonia fuel in internal combustion engines in a clean manner.
随着内燃机对降低 CO 排放的严格规定，氨已被用作替代燃料。研究发动机相关性能如何受到柴油燃料部分氨替代的影响对于理解燃烧至关重要。因此，本研究基于实验室制造的柴油机的相关参数（即压缩比、负荷、氨能量分数等），为柴油和氨两种燃料的燃烧开发了一个三维数值模拟模型。研究了负荷和压缩比对氨能量分数在 50%至 90%之间的燃烧和污染物排放的影响。随着氨比例的增加，增加的氨当量比导致氨远离稀燃边界，并加速氨的燃烧速率。压缩比的增加显著提高了规定的热性能和燃烧效率。当压缩比为 16 时，随着氨能量分数的增加，由于氨的比例增加，即氮原子的比例增加，在燃烧过程中会产生更多的 NOx。当氨取代率为 90%时，随着压缩比的增加，气缸压力和温度升高。氨的燃烧效率增加，产生更多的 NOx，NOx 排放量可达 0.66mg/m。在压缩比为 18 时，NOx 排放量可达 1.59mg/m。然而，在中低负荷条件下，随着氨分数的增加，燃料的总能量减少，氨的燃烧效率降低，导致燃烧过程中释放的热量减少，NOx 排放量减少。当氨取代率为 90%且负荷为 25%时，NOx 排放量达到 0.1mg/m。本研究为内燃机清洁高效地利用氨燃料提供了理论建议。
