NO Removal Ratio Research Articles

NO Removal with Repetitive Discharges Caused by Reciprocal Traveling Wave Voltage Pulse in a Coaxial Cable

This paper describes experimental results of NO removal using barrier discharges produced by a reciprocal pulse generator. When a coaxial cable is charged and then grounded at one end of the cable without any resistance, a reciprocal traveling voltage pulse is repeatedly applied to a barrier-type reactor at the opposite end with a change in its polarity. 50% streamer initiation voltage for the reciprocal pulse generator was much smaller than that with the self-matched pulse generator having a matching resistance. The reason for the low initiation voltage in the reciprocal pulse was that space charges which accumulated on the barrier surface during cable charging had an effect on field enhancement in the reactor after the first polarity reversal. High speed photographs of discharge light produced by the reciprocal pulse showed that the voltage oscillation caused by one switching induced alternate propagation of positive and negative streamers with a very high frequency. In measurements of NO concentration, the reciprocal pulse generator gave a better performance for NO removal ratio than the self-matched pulse generator even though the stored energy in the recipocal pulse generator was very low.

誘導型パルスパワー電源を用いたNO<sub>x</sub>除去

The discharge using pulse power with a short pulse width can produce a lot of electrons with high energy. This method has a possibility to remove poisonous gases with low energy consumption. In this paper, the inductive energy storage pulsed power generator, which can generate narrow and high voltage pulses (FWHM less than 100ns, output voltage of about 100kV), is used to remove NOx gas. It is found from spectrum measurement that this generator can produce high energy electrons, more than 10eV, in the discharge region at atmospherics pressure. The mixed gases of NO and N2 are used as a trial gas. The NO removal ratio of about 95% is achieved without producing NO2. These chemical phenomena are approximately explained by solving rate equations.