Effect of NO Concentration on Effectiveness of Barrier Discharge Treatment Flue Gas Pollutants

Abstract

Three groups of different initial NO concentration experiments were conducted using a concentric cylinder double dielectric-barrier discharge reactor to investigate how variational initial NO concentrations affect the effectiveness of dielectric barrier discharge (DBD) treatment flue gas pollutants. Results show that the input energy density increases with increasing the initial NO concentration under a same NO removal efficiency condition. It implies that low nitrogen oxides (NO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">X</sub> ) burners and over-fire air should be installed as a prerequisite to DBD NO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">X</sub> control due to their lower costs. Experimental data show that a nonlinear relation exists between the NO removal efficiency, the input energy density and the initial NO concentration. However, it is noticed that there exists an approximately linear relation between the NO removal efficiency and the input energy density when the outlet NO concentration is greater than 100 cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> /m <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> . Inspired by this, we construct a new function named energy concentration ratio. Experimental data prove that the NO removal efficiency has a linear dependence relation with the energy concentration ratio when the outlet NO concentration is greater than 100 cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> /m <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> . Based on this, we fit out an empirical formula to express the linear functional relationship between the NO removal efficiency and the energy concentration ratio.