Experimental Investigation On Microsecond Pulsed Plasma Supported Biogas Combustion

IF 1.4 4区 工程技术 Q3 ENGINEERING, MECHANICAL
Ahlem Ghabi, Toufik Boushaki, Pablo Escot Bocanegra, Eric Robert
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Abstract

Abstract This paper evaluates the effect of a microsecond pulsed plasma (MPP) on the stabilization and emission characteristics of non-premixed biogas/air flames with various CO2 contents. The MPP is generated by a unique DC-pulsed power generator providing high voltage (HV) pulses over a wide range of pulse repetition frequencies. The burner configuration is made up of two concentric tubes in which a swirler is placed inside the annular part, ensuring the oxidizer's rotation. The central tube delivers the fuel through an injector placed close to the burner exit. Electrical diagnostics, including voltage, were performed. OH* chemiluminescence measurements were done to describe the structure and stability of the flame. Results showed that plasma generated by microsecond HV pulses can improve flame stability. In this regard, the distribution of key active species in the burner was studied via optical emission spectroscopy (OES). The results revealed that the pulsed plasma generates chemically active species such as excited N2*, CH*, OH* molecules, and H* and O* atoms, thereby improving flame stability. The dependence of the emitted species intensities on plasma parameters was investigated in detail. It is demonstrated that MPP can drastically enhance the dynamic flame stability of swirling non-premixed biogas flames, especially at lean operating conditions. In addition, NOx and CO emissions were studied over a wide range of pulse repetition frequencies. It is seen that the pulsed plasma increases NOx emission slightly and significantly reduces CO concentration in the flue gases.
微秒脉冲等离子体支持沼气燃烧的实验研究
摘要本文研究了微秒脉冲等离子体(MPP)对不同CO2含量的非预混沼气/空气火焰的稳定性和发射特性的影响。MPP由一个独特的直流脉冲功率发生器产生,在宽脉冲重复频率范围内提供高压(HV)脉冲。燃烧器的结构由两个同心管组成,其中一个旋流器放置在环形部分内,以确保氧化剂的旋转。中心管通过靠近燃烧器出口的喷油器输送燃料。进行电气诊断,包括电压。OH*化学发光测量描述了火焰的结构和稳定性。结果表明,微秒高压脉冲产生的等离子体可以提高火焰的稳定性。为此,利用光学发射光谱(OES)对燃烧器内关键活性物质的分布进行了研究。结果表明,脉冲等离子体产生了化学活性物质,如受激发的N2*、CH*、OH*分子以及H*和O*原子,从而提高了火焰稳定性。详细研究了等离子体参数对发射物质强度的影响。实验结果表明,MPP能显著提高旋转非预混沼气火焰的动态火焰稳定性,特别是在稀薄工况下。此外,在广泛的脉冲重复频率范围内研究了NOx和CO的排放。可以看出,脉冲等离子体略微增加了NOx排放,显著降低了烟气中的CO浓度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
3.80
自引率
20.00%
发文量
292
审稿时长
2.0 months
期刊介绍: The ASME Journal of Engineering for Gas Turbines and Power publishes archival-quality papers in the areas of gas and steam turbine technology, nuclear engineering, internal combustion engines, and fossil power generation. It covers a broad spectrum of practical topics of interest to industry. Subject areas covered include: thermodynamics; fluid mechanics; heat transfer; and modeling; propulsion and power generation components and systems; combustion, fuels, and emissions; nuclear reactor systems and components; thermal hydraulics; heat exchangers; nuclear fuel technology and waste management; I. C. engines for marine, rail, and power generation; steam and hydro power generation; advanced cycles for fossil energy generation; pollution control and environmental effects.
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