Flue gas treatment using multipoint barrier discharge with pulse modulator

An experimental study on the removal of NOx in flue gas has been carried out using plasma chemical reactions in a dielectric barrier discharge. A multipoint-to-plane geometry is used for electrode to lower the operating voltage. Plasma is produced in a narrow gap by a dielectric barrier discharge at low applied voltage with sinusoidal waveform of 2–3 kV r.m.s.. The configurations of parallel plane electrode and multipoint-to-plane electrode have been compared to provide information an effectiveness of the gas treatment. The experimental result shows that the multipoint-to-plane electrode is more effective than parallel plane at low energy and low operating voltage. The power requirements would be 24 W to remove 200 ppm of NO using multipoint-to-plane geometry, while the power requirement is 177 W by using parallel plane reactor. At the NOx reduction from a 20 kVA diesel engine exhaust gas, the power supply used was mainly composed with rectifier circuits, IGBT and pulse transformers, and 10 kV pulses can be generated at 2.5 kpps (pulses per seconds). The NOx (NO+NO2) in the gas exhausted from the diesel engine generator has been reduced up to 10% with electrical efficiency of 28 g/kWh at a flow rate of 1.2 Nm³/min‥