Drop-in biofuels can play an important role in the transition from fossil-based fuels to carbon-neutral energy carriers. This work focuses on performance and emission of hydrotreated pyrolysis oil (HPO) for heavy-duty (HD) engines application. The HPO is blended with marine gas oil (MGO) in various mass ratios and tested both in combustion research unit (CRU) and engine facilities. Typical cruise speeds and multiple loads are selected in the heavy-duty engine tests. Both inlet temperature and EGR rate are varied to investigate the effects of control parameters on HPO. The results reveal that HPO present lower reactivity than MGO and diesel under CRU condition. It can function as a drop-in fuel without any modification to the engine and no recalibration was required. Specifically, key combustion phases are noticed to be identical. The engine can run smoothly and safely at 50% blend ratio with 1% reduction on net indicated efficiency (NIE) and 0.002 g/kWh particulate matter emissions (PM). At low load, the NOx emissions decrease to 1 g/kWh at 40% EGR, yet 1% decrease of NIE is shown. While all fuels yield more NOx but less PM emissions as the increase of inlet temperature. Inlet heating does decrease the NIE by 1%.

中文翻译：

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EGR重型发动机加氢热解油性能及排放实验研究

直接生物燃料可以在从化石燃料到碳中性能源载体的转变中发挥重要作用。这项工作的重点是重型（HD）发动机应用的加氢处理热解油（HPO）的性能和排放。HPO 以不同的质量比与船用轻柴油 (MGO) 混合，并在燃烧研究装置 (CRU) 和发动机设施中进行了测试。在重型发动机测试中选择了典型的巡航速度和多种负载。改变入口温度和 EGR 率以研究控制参数对 HPO 的影响。结果表明，在 CRU 条件下，HPO 的反应活性低于 MGO 和柴油。它可以用作直接燃料，无需对发动机进行任何改造，也无需重新校准。具体来说，关键燃烧阶段是相同的。该发动机可以在 50% 的混合比下平稳、安全地运行，净指示效率 (NIE) 降低 1%，颗粒物排放 (PM) 降低 0.002 克/千瓦时。低负荷时，40% EGR 时，NOx 排放量降至 1 g/kWh，但 NIE 降低了 1%。虽然所有燃料都会随着入口温度的升高而产生更多的氮氧化物（NOx），但颗粒物（PM）排放量却更少。入口加热确实会使 NIE 降低 1%。