Experimental study on the influence of H ₂ O vapor and O ₂ for desulfurization and denitrification of the diesel exhaust in marine application by non‐thermal plasma

Abstract

To improve the pollutant removal efficiency by non-thermal plasma (NTP), the effect of H 2 O vapor and O 2 on removal efficiency of NO and SO 2 as well as the reduction of CO was investigated in H 2 O/O 2 /SO 2 /NO/C 3 H 6 /CO 2 /N 2 system. To analyse the reaction mechanism, the effects of H 2 O vapor and O 2 on the emission intensity of Oð3p 5 P → 3s 5 S 0 2 Þ and OHðA 2 ∑ þ → X 2 ∏Þ were investigated. The experimental results show that the increase of H 2 O vapour (0%-9.8%) promotes the generation of OH radicals, increases the removal efficiency of NO from 18.9% to 57.3%, decreases the energy per NO removed from 449.0 to 148.1 eV/NO, increases SO 2 removal efficiency from 4.8% to 35.3%, decreases the energy per SO 2 removed decreases from 2784.0 to 582.9 eV/SO 2 , and reduces the generation of CO from 460 to 229 ppm. In the range of 0%-15%, the increase of O 2 content promotes the formation of O radicals, increases the removal efficiency of NO from 8.5% to 54.2%, and decreases the energy per NO removed from 994.3 to 156.4 eV/NO. In the range of 0%-5%, increasing O 2 content promotes SO 2 removal efficiency from 8.7% to 24.8%, and decreases the energy per SO 2 removed from 2485.7 to 876.6 eV/SO 2 . However, CO generation increases from 200 to 350 ppm with the increase of O 2 in 0%-5% due to the incomplete oxidation of C 3 H 6 . In the range of 5%-15%, the increase of O 2 produces more O radicals, decreases the removal efficiency of SO 2 from 24.8% to 23.5% and the generates of CO from 350 to 311 ppm. This study is helpful for improving the efficiency of NTP for desulfurization and denitrification, while reducing the by-product CO.This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

Nanosecond‐pulsed microbubble plasma reactor for plasma‐activated water generation and bacterial inactivation

“…Cold atmospheric pressure plasmas (CAPPs) have been successfully applied in biomedicine, [ 1–3 ] energy conversion, [ 4–6 ] agriculture, [ 7,8 ] insulation materials processing, [ 9,10 ] and some emerging industrial applications. [ 11,12 ] Plasma activated water (PAW), derived from the interaction between CAPPs and liquids (e.g., water or solutions), is a green prospective solution for a wide range of biological applications, from water purification to biomedicine. [ 13 ] The biochemical activity of PAW is directly linked to the presence of the highly reactive species in water, particularly long‐lived species, such as nitrite (NO 2 – ), nitrate (NO 3 – ), hydrogen peroxide (H 2 O 2 ) and ozone (O 3 ), and short‐lived species, such as hydroxyl ( • OH), superoxide ( • O 2 − ) and peroxynitrite (ONOO − ).…”

Effects of Reactive Species Produced by Electrolysis of Water Mist and Air through Non-Thermal Plasma on the Performance and Exhaust Gas of Gasoline Engines

“…NTP electrolysed the mixture of the water mist and air to produce combustibles and combustion-supporting substances into the engine. The reaction formula of the water electrolysis by NTP was as follows [ 21 ]: where represents the excited-state oxygen atom and denotes the ground-state oxygen atom.…”

“…High-energy electrons in the NTP collided and dissociated the gas molecules, such as N 2 and O 2 originally existing in the air, resulting in atoms and free radicals etc., after the air came into contact with the NTP. The reaction formula was as follows [ 21 , 22 ]:…”

Study on the effect and its mechanism of H2O, O2 and CO2 on NTP combined with CH4-SCR

“…With the H2O content increased from 0.5% to 10.4%, the CO concentration continued to decrease to 9ppm without NTP, and the addition of NTP increased the In NTP-CH4-SCR system, H2O could react to form a large number of oxidizing free radicals such as OH and HO2 (eq. ( 21) (22) ( 23)) (Yin et al 2009;Cai et al 2021), that promoted the direct oxidation of CH4, so that the CH4 removal efficiency gradually rose and the NOx removal efficiency continued to decline. Figure 13 shows Study on Effect of O2/H2O on CH4 and NOx Removal with NTP 13 the influence of H2O content on the number density of OH and HO2.…”