Removal of NO in Mist by the Combination of Plasma Oxidation and Chemical Absorption

Abstract

A coaxial nonthermal plasma (NTP) reactor was used for oxidizing and removing NO in mist. The effects of gas/mist components on O3 formation, NO oxidation, and NO x removal by NTP in simulated flue gas after wet desulfurization were investigated. The presence of mist results in the significant decrease of O3 concentration. Formation of active species, such as OH and HO2, would promote the reactions between NO and OH/HO2. Thus, the NO oxidation, NO x removal, and energy efficiency are significantly improved in the presence of mist. The promotion effects of mist component on the NO oxidation and NO x removal follow the order: Na2SO3 mist > FeSO4 mist > Na2SO4 mist. Increase of the mist pH can enhance the absorption of nitrogen oxides with the mist. Adding SO2 to the gas mixtures or raising the NO2/NO x ratio of simulated gas increases the NO x removal efficiency. This process demonstrates that NO oxidation by NTP and subsequently absorption by mist are feasible and have great value to practical application.

Experimental Study on Simultaneous Desulfurization and Denitrification by DBD Combined with Wet Scrubbing

“…Yu et al built a DBD reactor combined with a seawater scrubbing system for a diesel engine, achieving removal efficiencies for NO x and SO 2 of 70% and 90%, respectively [23]. Xie et al investigated the effects of different scrubbing solutions (Na 2 SO 3 , FeSO 4 , Na 2 SO 4 ) on the denitration efficiency using NTP oxidation combined with wet scrubbing [24]. Zhang et al established a one-dimensional model for a plasma chemical reaction process involving desulfurization and denitration via corona discharge [25].…”

NOxRemoval from Simulated Marine Exhaust Gas by Wet Scrubbing Using NaClO Solution

“…However, this method requires a high energy consumption [8,9]. Similarly, ozone oxidation method encounters the same limitation [10][11][12]. Another feasible approach is to add the oxidants into the absorbent.…”

Nitric Oxide Oxidation and Its Removal in Mist by Nonthermal Plasma: Effects of Discharge Conditions

“…Actually, WESP can be also regarded as a NTP reactor energized by DC corona discharge because there is no essential difference in reactor configuration between WESP and NTP reactor. Herein, a new process is proposed for simultaneous removal of NO x and SO 2 in mist by NTP, which was discussed in our previous paper, as shown in Figure .…”