Vence Jesús, Paz Concepción, Suárez Eduardo, Cabarcos Adrián, Conde-Fontenla Marcos
CINTECX, Universidade de Vigo, Campus Universitario Lagoas-Marcosende, 36310, Vigo, Spain.
Heliyon. 2023 Jul 7;9(7):e17861. doi: 10.1016/j.heliyon.2023.e17861. eCollection 2023 Jul.
The integration of alternative energy sources as a replacement for fossil fuels across various industrial sectors, including power generation, emergency systems, or marine applications, is uncertain. As a result, the utilization of traditional fuels is not anticipated to be fully phased out in the near future. To address this, new technologies, such as those that employ oxidising atmospheres, have been explored as a means to enhance the pollution control capabilities of existing technologies, as the Exhaust Gas Recirculation (EGR) system. In this regard, the present study has assessed the efficacy of ozone atmosphere exposure in mitigating the formation of undesired fouling deposits within the system, with the aim of facilitating more efficient operation of EGR devices and extending their service life. To this end, dry soot samples have been exposed to various ozone atmospheres at different temperatures and ozone concentrations through the utilization of an experimental test bench. The oxidation potential of these atmospheres has been evaluated through the analysis of the deposit mass loss. Likewise, confocal microscopy techniques have been employed to obtain the 3D topography of the fouling samples before and after the ozone treatment, allowing the assessment of the deposit thickness reduction, as well as the surface roughness variation. Additionally, thermogravimetric analysis has been conducted to examine the effects of the oxidation processes on fouling samples composition. The findings of this study have revealed that ozone atmospheres have been effective in reducing deposit mass at ozone treatment temperatures above 100 °C. The reduction in mass has reached 78.5% and 91.8% with treatment temperature of 140 °C with ozone concentrations of 30 gO/m³ and 50 gO/m³, respectively. It has also been established that treatment conditions with ozone concentrations of 30 gO/m³ and 50 gO/m³ are effective in reducing the thickness of deposits even at intermediate treatment temperatures, resulting in a thickness reduction of 78.6% and 81.1% at 80 °C, respectively. Additionally, it has been observed that the ozone exposure leads to the increase in the proportion of volatile material within the deposit.
包括发电、应急系统或船舶应用在内的各个工业部门将替代能源作为化石燃料的替代品进行整合，其前景尚不明朗。因此，预计在不久的将来传统燃料的使用不会被完全淘汰。为解决这一问题，人们探索了诸如采用氧化气氛的新技术，作为增强现有技术（如废气再循环（EGR）系统）污染控制能力的一种手段。在这方面，本研究评估了臭氧气氛暴露对减轻系统内不期望的污垢沉积物形成的效果，目的是促进EGR装置更高效运行并延长其使用寿命。为此，通过使用实验测试台，将干燥的烟灰样品在不同温度和臭氧浓度下暴露于各种臭氧气氛中。通过分析沉积物质量损失来评估这些气氛的氧化潜力。同样，采用共聚焦显微镜技术获取臭氧处理前后污垢样品的三维形貌，从而评估沉积物厚度的减少以及表面粗糙度的变化。此外，还进行了热重分析，以研究氧化过程对污垢样品成分的影响。本研究结果表明，在臭氧处理温度高于100°C时，臭氧气氛可有效减少沉积物质量。在140°C、臭氧浓度分别为30 gO/m³和50 gO/m³的处理温度下，质量减少分别达到78.5%和91.8%。还确定了臭氧浓度为30 gO/m³和50 gO/m³的处理条件即使在中等处理温度下也能有效减少沉积物厚度，在80°C时厚度分别减少78.6%和81.1%。此外，观察到臭氧暴露导致沉积物中挥发性物质比例增加。
