Effects of process variables on NOx conversion by pulsed corona discharge process

초록

We investigated the effects of several process variables (initial concentrations of NO, NH<inf>3</inf>, and H<inf>2</inf>O and electron concentration) on NO<inf>x</inf> conversion by the pulsed corona discharge process (PCDP). In the PCDP, most of the NO is converted into NO<inf>2</inf> and, later, into HNO<inf>3</inf> which reacts with NH<inf>3</inf> to form NH<inf>4</inf>NO<inf>3</inf> particles. We solved the model equations of chemical species in the PCDP considering 23 chemical species and 54 chemical reactions. As the initial NO concentration increases or electron concentration decreases, it takes a longer reactor length to remove the NO<inf>x</inf> by the PCDP. As the initial H<inf>2</inf>O, it takes a shorter reactor length to remove the NO<inf>x</inf>. As the initial NO and H<inf>2</inf>O and electron concentration decreases, or as the initial NH<inf>3</inf> concentration increases, it takes a longer reactor length to consume the NH<inf>3</inf> by the particle formation reactions. The information on the effects of several process variables on the plasma chemistry in NO<inf>x</inf> conversion can be the basis guideline to develop a more efficient PCDP and this study can be extended to obtain the information on particle characteristics of ammonium salts.

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