Experimental study of the ozone as an anti-fouling system in an exhaust gas heat exchanger

IF 6.1 2区工程技术 Q2 ENERGY & FUELS

Applied Thermal Engineering Pub Date : 2025-04-18 DOI:10.1016/j.applthermaleng.2025.126538

Saúl Díaz-Rodríguez, Eduardo Suárez, Miguel Concheiro, Concepción Paz-Penín

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Abstract

Fouling generated in combustion systems and their auxiliary elements is a problem of interest for transportation engineering and all areas of application of combustion systems. In this work, the use of ozone as a system to minimize or eliminate fouling on the elements that make up a combustion system and the effect on the exhaust gas stream was experimentally analyzed. To carry out the experiments, a fouling generation test bench was used, to which an autonomous ozone injection system was coupled. Tests were performed under controlled conditions to characterize the generated stream and fouling. The tests were carried out at different exhaust gas temperatures and at different injection points, under conditions close to real conditions. These tests made it possible to analyze the effect of temperature and position of ozone injection on fouling and gas flow, compared to equivalent tests without ozone injection. The changes produced by ozone injection on fouling were analyzed based on thermal efficiency, head loss and deposited mass. Furthermore, THC, opacity, CO, CO₂, O₂, NO and particle distribution were measured to study the changes in the exhaust gas. Ozone injection produces an increase in thermal efficiency of more than 4 units after 8 h. The head loss showed different effects depending on the temperature, decreased by more than 10 % for the 140 °C tests and increased by more than 10 % for the 180 °C tests. In the gas stream, THC concentration decreased by 6–10 times and CO concentration increased by more than 30 %.

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臭氧作为废气换热器防垢系统的实验研究

燃烧系统及其辅助元件产生的结垢是交通工程和燃烧系统应用的所有领域都感兴趣的问题。在这项工作中，使用臭氧作为一个系统，以尽量减少或消除污垢的元素，构成一个燃烧系统和对废气流的影响进行了实验分析。为了进行实验，使用了一个污垢产生试验台，并与一个自主臭氧喷射系统耦合在一起。在受控条件下进行了测试，以表征生成的流和结垢。测试在不同的废气温度和不同的喷射点进行，条件接近真实条件。与没有臭氧注入的等效试验相比，这些试验使得分析臭氧注入温度和位置对结垢和气体流动的影响成为可能。从热效率、水头损失和沉积质量三个方面分析了臭氧注入对结垢的影响。通过测量THC、不透明度、CO、CO2、O2、NO和颗粒分布来研究废气中的变化。8小时后，臭氧注入使热效率提高了4个单位以上。水头损失随温度的变化而变化，在140°C试验中降低10%以上，在180°C试验中增加10%以上。在气流中，THC浓度下降了6-10倍，CO浓度增加了30%以上。

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来源期刊

Applied Thermal Engineering 工程技术-工程：机械

CiteScore

11.30

自引率

15.60%

发文量

1474

审稿时长

57 days

期刊介绍： Applied Thermal Engineering disseminates novel research related to the design, development and demonstration of components, devices, equipment, technologies and systems involving thermal processes for the production, storage, utilization and conservation of energy, with a focus on engineering application. The journal publishes high-quality and high-impact Original Research Articles, Review Articles, Short Communications and Letters to the Editor on cutting-edge innovations in research, and recent advances or issues of interest to the thermal engineering community.