Absorption characteristics of sulfur dioxide in water in the presence of a corona discharge

Abstract

The absorption characteristics of sulfur dioxide into a stagnant body of distilled water are investigated in the presence of point-plane ionic discharges in a closed chamber at 30 ± 0.1 °C. S02 removal is seen to be enhanced when the liquid surface is subjected to the discharge, with the bulk of the enhancement resulting in acidic deposition within the chamber. Gas-phase oxidation of S02 in the absence of liquid water is seen to be minimal. The effects of varying the discharge intensity and polarity and gas oxygen content on the observed absorption rate enhancements are reported.

Absorption of sulphur dioxide by electrosprayed droplets

“…The negligible effects of droplet polarity has already been shown in previous works about experiments with large scale sprays. [11,[24][25][26] This result is consistent with the physical expectations regarding the chargedipole interactions occurring between the charged drop and the polar, uncharged, SO 2 molecule. In a first attempt, we extended Equation (1) to provide a semiempirical equation to describe the ratio Λ se / Λ s can be derived in the following form:…”

“…In addition, the corona generates an ionic wind mostly oriented toward the ground electrode of the corona charger. [16,[24][25][26]30,31] This further increased the depletion rate over the setup walls. The correlation between Λ we /Λ w and the corona current became faint for potentials higher than +10 kV.…”

“…The negligible effects of corona charging on SO 2 absorption is also different from the results in other papers, which report an improvement in the SO 2 absorption rate in the presence of corona ionization. [25,26,31] However, there are several differences between the experimental methodology adopted in this paper and that followed by the other authors. In fact, all the former experiments refer to the case of a liquid surface directly impinged by the ionic wind generated by a corona source in SO 2 /N 2 or SO 2 /N 2 /O 2 gas streams.…”

“…The dashed line represents the absolute value of the corona current as a function of the potential applied to the corona charger F I G U R E 7 Values of the ratio Λ se /Λ s as a function of the applied corona potential for charging potential for a spray operated at +2 kV. The dashed line represents the absolute value of the corona current as a function of the potential applied to the corona charger and Vasistha and Someshwar [26] found a significant improvement in the absorption rate and understood that the ionic wind effects were more important than the formation of S(VI) oxidized species, as SO 3 and H 2 SO 4 . Ionic wind significantly altered the fluid dynamic field close to the water surface, since the ion flow impinged the water interface perpendicularly.…”

NO to NO₂ and Nitric Acid Conversion by Corona Induced Non-Thermal Plasmas and H₂O₂ Scrubbing

“…DC Corona enhanced SO2 and nitric gases absorption has been known for many years (3,4). However, the effects of DC corona modes of glow and streamer on the absorption or chemical reactions have not been identified in previous work, for which the glow discharge induces negligible chemical reactions (5).…”