Temperature Effects on Gaseous Fuel Cracking Studies Using a Dielectric Barrier Discharge
Temperature Effects on Gaseous Fuel Cracking Studies Using a Dielectric Barrier Discharge
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使用介质阻挡放电研究温度对气体燃料裂解的影响
DOI：
10.1109/tps.2008.2003193
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发表时间：
2008
影响因子：
1.5
通讯作者：
Yongho Kim
中科院分区：
文献类型：
--
作者：
R. Renneke;L. Rosocha;Yongho Kim
使用等离子体进行燃料裂解是通过从较重的碳氢化合物形成较轻的碳氢化合物和氢气来增强燃烧的方法之一。较轻的碳氢化合物和氢气在更稀薄的燃烧条件下燃烧更清洁，从而提高燃烧稳定性并产生更少的污染（特别是氮氧化物 - NOx）。裂解的燃料碎片也有望有效燃烧更多，因此，可以从燃料中提取更多的能量。洛斯阿拉莫斯国家实验室通过使用交流环形介质阻挡放电（也称为无声放电）来完成燃料裂解。这会在屏障（陶瓷管）和中心电极之间形成非热等离子体，通常充电至 5-10 kV。非热等离子体相对较冷，因为电子携带大部分能量，而离子和中性粒子保持在大约环境温度。我们的实验表明，反应器内温度的升高会提高 C2H6（乙烷）母气中 CH4（甲烷）、C2H2（乙炔）、C2H4（乙烯）和 C3H8（丙烷）的稳定浓度。交流波形用于加热介电屏障，进而加热反应器中的非热等离子体。这些实验的结果与乙烷等离子体化学的 KINEMA 模型进行了比较。该模型预测了与实验数据相同的全球趋势。该模型表明，与环境情况相比，某些自由基形成反应以及 H2、CH4 和 C3H8 的直接途径在较高温度下的反应速率有所提高。
Fuel cracking using a plasma is one of the methods to enhance combustion by forming lighter hydrocarbons and hydrogen from heavier ones. Lighter hydrocarbons and hydrogen burn more cleanly and under much leaner burn conditions, thereby increasing combustion stability and producing less pollution (particularly oxides of nitrogen - NOx). The cracked fuel fragments are also expected to efficiently burn more, and thus, more energy can possibly be extracted from the fuel. Fuel cracking is accomplished at Los Alamos National Laboratory by using an AC annular dielectric barrier discharge (also called a silent electrical discharge). This forms a nonthermal plasma between the barrier (a ceramic tube) and the central electrode, which is typically charged to 5-10 kV. The nonthermal plasma is relatively cold, since electrons carry most of the energy and the ions and neutrals remain at approximately ambient temperature. Our experiments show that increased temperature inside the reactor elevates the stable concentration of CH4 (methane), C2H2 (acetylene), C2H4 (ethylene), and C3H8 (propane) from a C2H6 (ethane) parent gas. The AC waveform was used to heat the dielectric barrier, which in turn heated the nonthermal plasma in the reactor. Results of these experiments were compared to a KINEMA model of ethane plasma chemistry. The model predicts the same global trends as the experimental data. This modeling shows that certain radical-forming reactions, and direct pathways for H2, CH4, and C3H8, have enhanced reaction rates at higher temperatures compared to the ambient case.