A study was conducted to examine the potential of diesel emissions control strategies based on retrofitting existing power packages with exhaust aftertreatment devices and repowering with advanced power packages. The retrofit systems, a diesel oxidation catalyst (DOC) and diesel particulate filter (DPF), were evaluated individually using a US EPA tier 2 (ter 2) engine operated under four steady-state conditions and one transient cycle. The DOC effectively curtailed emissions of CO, and to some extent organic carbon (OC), elemental carbon (EC), and aerosol number concentration. The DPF system offered substantially higher reductions in OC and EC mass and aerosol number concentrations. Both, the DOC and DPF achieved reductions in the aforementioned emissions without adversely affecting emissions of NO 2 and nano-sized aerosols. The strategy of repowering with an advanced system was examined using a US EPA tier 4 final (tier 4f) engine equipped with a cooled exhaust gas recirculation system and diesel exhaust fluid-based selective catalytic reduction system, but not with a DPF system. The tier 4f engine contributed substantially less than the tier 2 engine to the EC and OC mass, aerosol number, and CO, NO, and NO 2 concentrations. The tier 4f engine was very effective in reducing aerosol mass, NO, and NO 2 concentrations, but it was not equally effective in reducing aerosol number concentrations. The implementation of viable exhaust after treatment systems and advanced diesel power packages could be instrumental to the underground mining industry to secure a clean, economical, and dependable source of power for mobile equipment.

中文翻译：

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改造和重新供电作为减少地下矿工接触柴油气溶胶的控制策略

进行了一项研究，以检查柴油机排放控制策略的潜力，该策略基于使用排气后处理装置改造现有动力套件并使用先进动力套件重新供电。改装系统、柴油氧化催化剂 (DOC) 和柴油微粒过滤器 (DPF) 分别使用美国 EPA 2 级 (ter 2) 发动机在四种稳态条件和一个瞬态循环下运行进行评估。DOC 有效地减少了 CO 的排放，并在一定程度上减少了有机碳 (OC)、元素碳 (EC) 和气溶胶数浓度。DPF 系统显着降低了 OC 和 EC 质量以及气溶胶数浓度。DOC 和 DPF 都实现了上述排放的减少，而没有对 NO 2 和纳米级气溶胶的排放产生不利影响。使用配备冷却废气再循环系统和基于柴油机废气流体的选择性催化还原系统但未配备 DPF 系统的美国 EPA 4 级最终（4f 级）发动机，对使用先进系统重新供电的策略进行了检查。Tier 4f 发动机对 EC 和 OC 质量、气溶胶数以及 CO、NO 和 NO 2 浓度的贡献大大低于 Tier 2 发动机。Tier 4f 引擎在减少气溶胶质量、NO 和 NO 2 浓度方面非常有效，但在减少气溶胶数浓度方面效果并不相同。可行的废气后处理系统和先进的柴油动力包的实施可能有助于地下采矿业为移动设备确保清洁、经济和可靠的电源。