摘要
柴油发电机组是常见的电力设备,在黑启动、应急电源、微电网中有广泛应用。“双碳”目标的提出,也推动着柴油动力系统向着“零碳”化的生物燃料方向发展。目前以正辛醇为生物燃料的柴油发电机在输出特性和污染物排放方面仍有较大优化空间。本研究将正辛醇用于柴油机发电,基于KIVA-CHEMKIN数值模拟程序,结合正交设计法,分别研究在不同转速下喷射锥角和喷射正时(start of injection,SOI)对柴油机燃烧及排放特性的影响。并通过分析射策略下获得的内燃机最大压力升高率(maximum pressure rise rate,MPRR)、功率、缸内压力、热释放率(HRR)、NO_(x)和CO排放等数值,获得不同转速下的优化工况。研究结果表明,在1500r/min下,当SOI为-10°ATDC、喷射锥角为74.5°时,发电功率可提高3.71%,MPRR可降低36.78%,NO_(x)的排放略有增大;在2400r/min下,SOI为-9°ATDC、喷射锥角为74.5°时,发电功率可提高2.72%,MPRR可降低6.76%,NO_(x)排放降低了24.08%,CO排放降低了51.93%,实现了较好的性能优化和较低的污染物排放。
Diesel generator sets are common power equipment,widely used in black start,emergency power,microgrid power system.With the goal of"carbon peaking and carbon neutrality",the diesel power system is also driven towards the development of"zero carbon"biofuel.At present,there is still much space to optimize the output characteristics and pollutant emission of diesel generators using n-octanol as biofuel.In this study,n-octanol is used in a diesel engine for power generation.Based on the KIVA-CHEMKIN program,the effects of injection spray angle and start of injection(SOI)timing on the combustion and emission characteristics of the diesel engine at different speeds are investigated in combination with the orthogonal design method,respectively.The values of maximum pressure rise rate(MPRR),power,in-cylinder pressure,heat release rate(HRR),NO_(x) and CO emissions of the engine obtained under different injection strategies are also analyzed to obtain the optimized operating conditions at different speeds.The study results show that at 1500r/min,when the SOI timing is-10°ATDC and the injection spray angle is 74.5°,the power can be increased by 3.71%,the MPRR can be reduced by 36.78%,and the NO_(x) emission is slightly increased.At 2400r/min,when the SOI is-9°ATDC and the injection spray angle is 74.5°,the power can be increased by 2.72%and the MPRR can be reduced by 6.76%.Meanwhile,the NO_(x) emission is reduced by 24.08%and CO emission is reduced by 51.93%.Under the optimal conditions,the engine can achieve better performance and lower pollutant emission.
作者
王大健
于笑
李晶
WANG Dajian;YU Xiao;LI Jing(School of Mechanical and Power Engineering,Nanjing University of Technology,Nanjing 211816,China)
出处
《电力科技与环保》
2022年第4期307-316,共10页
Electric Power Technology and Environmental Protection
基金
江苏省自然科学基金资助项目(BK20171016)
江苏省创新工程资助项目(SJCX22_0430)。
