Leins Martina, Gaiser Sandra, Schulz Andreas, Walker Matthias, Schumacher Uwe, Hirth Thomas
Institute of Interfacial Process Engineering and Plasma Technology, University of Stuttgart;
Institute of Interfacial Process Engineering and Plasma Technology, University of Stuttgart.
J Vis Exp. 2015 Apr 16(98):52816. doi: 10.3791/52816.
This movie shows how an atmospheric pressure plasma torch can be ignited by microwave power with no additional igniters. After ignition of the plasma, a stable and continuous operation of the plasma is possible and the plasma torch can be used for many different applications. On one hand, the hot (3,600 K gas temperature) plasma can be used for chemical processes and on the other hand the cold afterglow (temperatures down to almost RT) can be applied for surface processes. For example chemical syntheses are interesting volume processes. Here the microwave plasma torch can be used for the decomposition of waste gases which are harmful and contribute to the global warming but are needed as etching gases in growing industry sectors like the semiconductor branch. Another application is the dissociation of CO2. Surplus electrical energy from renewable energy sources can be used to dissociate CO2 to CO and O2. The CO can be further processed to gaseous or liquid higher hydrocarbons thereby providing chemical storage of the energy, synthetic fuels or platform chemicals for the chemical industry. Applications of the afterglow of the plasma torch are the treatment of surfaces to increase the adhesion of lacquer, glue or paint, and the sterilization or decontamination of different kind of surfaces. The movie will explain how to ignite the plasma solely by microwave power without any additional igniters, e.g., electric sparks. The microwave plasma torch is based on a combination of two resonators - a coaxial one which provides the ignition of the plasma and a cylindrical one which guarantees a continuous and stable operation of the plasma after ignition. The plasma can be operated in a long microwave transparent tube for volume processes or shaped by orifices for surface treatment purposes.
这部影片展示了大气压力等离子体炬如何在不使用额外点火器的情况下由微波功率点燃。等离子体点燃后，可以实现稳定且持续的运行，并且该等离子体炬可用于许多不同的应用。一方面，热等离子体（气体温度为3600K）可用于化学过程，另一方面，冷余辉（温度低至接近室温）可用于表面处理。例如，化学合成是有趣的体相过程。在这里，微波等离子体炬可用于分解有害且导致全球变暖但在半导体等新兴工业领域作为蚀刻气体所必需的废气。另一个应用是二氧化碳的分解。来自可再生能源的多余电能可用于将二氧化碳分解为一氧化碳和氧气。一氧化碳可进一步加工成气态或液态的高级烃，从而实现能量的化学存储、为化学工业提供合成燃料或平台化学品。等离子体炬余辉的应用包括处理表面以提高漆、胶水或涂料的附着力，以及对不同类型表面进行消毒或去污。这部影片将解释如何仅通过微波功率而无需任何额外点火器（例如电火花）来点燃等离子体。微波等离子体炬基于两个谐振器的组合——一个同轴谐振器用于提供等离子体的点火，一个圆柱形谐振器用于确保等离子体点燃后持续稳定运行。等离子体可在长的微波透明管中运行以进行体相过程，或通过孔口进行整形以用于表面处理目的。
