Influence of Dielectric Barrier Discharge Power on the Removal of CH4 and NO From Exhaust Emissions of LNG Engines

IF 2.6 3区物理与天体物理 Q3 ENGINEERING, CHEMICAL

Plasma Chemistry and Plasma Processing Pub Date : 2024-07-15 DOI:10.1007/s11090-024-10491-7

Zhengtao Zhao, Lin Lyu, Chuang Xiang, Yunkai Cai

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Abstract

This study aims to explore the use of Dielectric Barrier Discharge (DBD) technology for the joint treatment of methane (CH₄) and nitrogen oxide (NO) in the exhaust of Liquid Natural Gas (LNG) engines during cold starts and at mid to low loads when the exhaust temperature is below 500 °C. Through experiment and numerical simulation, the effect of discharge power on the removal efficiency of CH₄ and NO in the exhaust of LNG engines was investigated under the condition of simulated flue gas temperature at 438 °C. A plasma chemical model suitable for analyzing the mixture of N₂/O₂/H₂O/CH₄/NO in the exhaust gases of LNG engines was constructed and validated. The study found that the conversion efficiency of CH₄ and NO exhibits different trends with the increase of discharge power, and CH₄ tends to be oxidized to CO under plasma conditions. Key reaction pathways for the DBD treatment of CH₄, NO, CO, and NO₂ were identified, and an important chemical reaction pathway with the potential for the joint treatment of CH₄ and NO was found: CH₃O₂ + NO → CH₃O + NO₂. Additionally, the crucial pathways for the stable conversion of NO to NO₂ were identified: O + NO + N₂ → NO₂ + N₂ and NO + O₃ → NO₂ + O₂, providing forward-looking theoretical guidance for subsequent research on plasma-facilitated selective catalytic reduction of NOx by CH₄.

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介质屏障放电功率对液化天然气发动机尾气中甲烷和氮氧化物去除的影响

本研究旨在探索在冷启动和中低负荷时（排气温度低于 500 °C），利用介质阻挡放电（DBD）技术联合处理液化天然气（LNG）发动机排气中的甲烷（CH4）和氮氧化物（NO）。通过实验和数值模拟，研究了在模拟烟气温度为 438 ℃ 的条件下，放电功率对 LNG 发动机排气中 CH4 和 NO 去除效率的影响。构建并验证了适用于分析 LNG 发动机废气中 N2/O2/H2O/CH4/NO 混合气的等离子体化学模型。研究发现，随着放电功率的增加，CH4 和 NO 的转化效率呈现出不同的趋势，在等离子体条件下，CH4 更倾向于被氧化成 CO。研究确定了 DBD 处理 CH4、NO、CO 和 NO2 的关键反应途径，并发现了具有联合处理 CH4 和 NO 潜力的重要化学反应途径：CH3O2 + NO → CH3O + NO2。此外，还确定了将 NO 稳定转化为 NO2 的关键途径：O + NO + N2 → NO2 + N2 和 NO + O3 → NO2 + O2，为后续研究等离子体促进 CH4 选择性催化还原 NOx 提供了前瞻性理论指导。

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来源期刊

Plasma Chemistry and Plasma Processing 工程技术-工程：化工

CiteScore

5.90

自引率

8.30%

发文量

审稿时长

6-12 weeks

期刊介绍： Publishing original papers on fundamental and applied research in plasma chemistry and plasma processing, the scope of this journal includes processing plasmas ranging from non-thermal plasmas to thermal plasmas, and fundamental plasma studies as well as studies of specific plasma applications. Such applications include but are not limited to plasma catalysis, environmental processing including treatment of liquids and gases, biological applications of plasmas including plasma medicine and agriculture, surface modification and deposition, powder and nanostructure synthesis, energy applications including plasma combustion and reforming, resource recovery, coupling of plasmas and electrochemistry, and plasma etching. Studies of chemical kinetics in plasmas, and the interactions of plasmas with surfaces are also solicited. It is essential that submissions include substantial consideration of the role of the plasma, for example, the relevant plasma chemistry, plasma physics or plasma–surface interactions; manuscripts that consider solely the properties of materials or substances processed using a plasma are not within the journal’s scope.