Influence of gas flow rate and reactor length on NO removal using pulsed power

Abstract

A short duration of 100-ns pulsed power has been used to remove nitric oxide (NO) in a mixture of nitrogen, oxygen, water vapor, and NO, simulating flue gases from a power station. The effects of the gas flow rate, the reactor length, and the pulse repetition rate on the percentage of NO removal and its energy efficiency are reported. The percentage of NO removal at a fixed gas flow rate increased with increasing pulse repetition rate due to the increased energy into the discharge. At a fixed pulse rate, the removal of NO increased with decreasing gas flow rate due to the increased residence time of the gas in the discharge reactor, thus facilitating the creation of increased radicals of O and N which then decreased NO. The energy removal efficiency of NO (in mol/kWh) decreased with increasing gas flow rate and increasing removal ratio of NO. The removal of NO increased with increasing energy density (J/l) input into the discharge at different reactor length.

NO Conversion by Dielectric Barrier Discharge and TiO2 Catalyst: Effect of Oxygen

“…3a). Similar result was found in some earlier studies [17,18]. In the case of NO:N 2 mixture the quantities of converted NO were close to those found by Penetrante et al [17] for different reactor types.…”

Experimental study on the optimization of dielectric barrier discharge reactor for NO<inf>x</inf>treatment

“…The current increases by changing discharge impedance mismatching with increasing the reactor length due to the raise of the produced streamer channels. Consequently, with approximately constant applied voltage for different electrode lengths, higher discharge power is achieved by using a longer electrode and therefore, more NOx can be removed from the exhaust gas [39]. Furthermore, the increase of electrode length increases the gas residence time.…”

NO conversion by positive streamer discharge—effects of gas compositions and reaction conditions

“…The feed gas consisted of air, 500 ppm NO, and the reaction temperature and flow rate were 15°C and 5.0 L/min, respectively, except when described especially. The treated gas was either conducted into a chemiluminescent NO-NO x analyzer (Thermo Electron Corp. Model 44) for NO and NO x measurement, or chemically absorbed by solutions for O 3 and NH 3 measurement by an Indigo disulphonate spectrophotometry and soldium salicylate-soldium hypochloritometric method, respectively.…”

“…For this reason, the advanced processes to remove the pollutants in an efficient and economical way are needed to be developed. The non-thermal plasma process, as a new and effective method for NO x removal, has actively been investigated since the 1980s [1][2][3][4][5][6][7][8].…”

“…Operation conditions, i.e. reaction temperature, gas flow rate, and reactor parameters, are also important factors affecting the non-thermal plasma process [3]. NH 3 injection provides reductive radicals, thus enhances the removal rate of the pollutants [4,5], and neutralizes nitric acids which are produced by the interaction of the radicals with NO.…”