Numerical Investigation on Counter Flow Injection of Waste Gas into Thermal Plasma Jet
S. Choi1, K.-S. Choi2, D.-W. Park3, and T. Watanabe1
1Department of Environmental Chemistry and Engineering, Tokyo Institute of Technology, Japan
2Applied Plasma System Co., Ltd., Republic of Koreaa
3Department of Chemical Engineering and Regional Innovation Center for Environmental Technology of Thermal Plasma (RIC-ETTP), Inha University, Republic of Korea
Abstract— Numerical analysis on thermal plasma processing for waste gas treatment was carried out considering counter flow injection of the waste gas into the thermal plasma jet. Different plasma flames were generated according to plasma gas flow rate, arc current and nozzle diameter. Thermal plasma jet from a small torch exit which has higher axial velocity than that from a large torch exit penetrates deep into the reaction tube in spite of relatively low input power and plasma gas flow rate. The major parameter influencing on the thermal flow field inside the reactor is the reaction tube diameter at top position, and thermal plasma introducing into the reaction tube comes hard by decreasing its size. At the same top diameter, the reaction tube with expansion type has an effect to increase the high temperature area in radial direction.
Keywords— Thermal plasma, perfluorocompounds (PFCs), counter flow injection, gas mixing, numerical analysis