Pulsed corona discharge for oxidation of gaseous elemental mercury

Ko, Kyung Bo; Byun, Youngchul; Cho, Moo‐Hyun; Namkung, W.; Hamilton, Ian; Shin, Dong Ku; Koh, Dong Jun; Kim, Kyoung‐Tae

doi:10.1063/1.2952496

Cited by 26 publications

(16 citation statements)

References 18 publications

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“…The reaction rate coefficient of NO with O 3 (1.8 9 10 -14 cm 3 molecules -1 s -1 ) (Reaction 13) [29] is much faster than that of (10.5 ± 0.65) 9 10 -19 cm 3 molecules -1 s -1 [30] for Hg 0 reacting with O 3 , implying that the O 3 can rapidly react with NO. Therefore, O 3 will be preferentially exhausted, Hg 0 oxidation efficiency markedly reduced, being in agreement with the results obtained in previous studies [31][32][33]. The concentration of SO 2 was varied to study effect of SO 2 on the Hg 0 oxidation (Fig.…”

Section: Effect Of Gas Atmospheres On Hg 0 Oxidation Efficiencysupporting

confidence: 78%

“…The reason can be explained from the difference of the possible reaction mechanisms between SO 2 and active species (ÁOH, ÁO and O 3 ). As indicated in the previous research [28,33], most SO 2 is oxidized to HSO 3 and SO 3 by ÁOH and ÁO radicals which are the main radical species for oxidation due to the large rate constant compared with the other radical species such as O 3 . Therefore, the consumption of O 3 , and total Hg concentrations was shown in Fig.…”

Section: Effect Of Gas Atmospheres On Hg 0 Oxidation Efficiencymentioning

confidence: 99%

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Oxidation of Elemental Mercury by Active Species Generated From a Surface Dielectric Barrier Discharge Plasma Reactor

Shang

Lü

et al. 2013

Plasma Chem Plasma Process

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A surface dielectric barrier discharge plasma reactor was employed to study Hg 0 oxidation in coal-fired flue gas. The experimental results showed that 98 % of Hg 0 oxidation efficiency and 13.7 lg kJ -1 of energy yield were obtained under a specific energy density (SED) of 7.9 J L -1 . Increasing SED was beneficial for Hg 0 oxidation due to higher production of active species. Higher initial concentration resulted in lower Hg 0 oxidation efficiency, but higher amount of Hg 0 oxidation. Water vapor inhibited Hg 0 oxidation because the generation of O 3 was suppressed. The presence of NO remarkably restrained Hg 0 oxidation, while SO 2 showed little effect on Hg 0 oxidation. Roles of active species in Hg 0 oxidation were examined under different gas atmospheres (O 2 and air), indicating that O 3 played an important role in Hg 0 oxidation. Deposits on the internal surface of the reactor were analyzed by energy dispersive spectroscopy and the product was identified as HgO.

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Section: Effect Of Gas Atmospheres On Hg 0 Oxidation Efficiencysupporting

confidence: 78%

Section: Effect Of Gas Atmospheres On Hg 0 Oxidation Efficiencymentioning

confidence: 99%

Oxidation of Elemental Mercury by Active Species Generated From a Surface Dielectric Barrier Discharge Plasma Reactor

Shang

Lü

et al. 2013

Plasma Chem Plasma Process

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“…A continuous increase in input energy increases electrical energy cost. These findings are consistent with results reported in plasma systems using corona discharge and single dielectric barrier discharge (Chen et al, 2006;Jeong and Jurng, 2007;Ko et al, 2008;Wang et al, 2010). Furthermore, these findings show that pre-existing NaCl particles improve Hg 0 removal efficiency.…”

Section: Figsupporting

confidence: 83%

“…The application of non-thermal plasma technology for mercury removal has been mainly studied with corona discharge (Ko et al, 2008;Byun et al, 2011b) and dielectric barrier discharge system (Chen et al, 2006;Jeong and Jurng, 2007;Byun et al, 2011a). Both kinds of plasma treatment systems employed one naked metal electrode (commonly as the high voltage electrode), which can partially heat the flue gas, resulting in the unnecessary consumption of electrical energy.…”

Section: Introductionmentioning

confidence: 99%

Improving the Removal Efficiency of Elemental Mercury by Pre-Existing Aerosol Particles in Double Dielectric Barrier Discharge Treatments

Jiang

Duan

et al. 2015

Aerosol Air Qual. Res.

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Plasma technology has been employed for the removal of gaseous elemental mercury (Hg 0 ) from simulated flue gases without pre-existing airborne particles. This study developed a double dielectric barrier discharge (DDBD) treatment system, in which two coaxial electrodes were covered by quartz dielectrics, for removing mercury with the presence of aerosol particles. The increase in pre-existing aerosol surface concentration can improve Hg 0 removal efficiency up to 160% in the DDBD device. Inorganic aerosol particles (sodium chloride) perform better than organic ones (sucrose) in improving Hg 0 removal efficiency. These aerosol particles can be collected in the DDBD system. For sodium chloride particles, a collection efficiency of more than 90% was observed in the tested diameter range of 10-100 nm. The improvement in Hg 0 removal with the presence of particles is possibly due to that (i) aerosol particles provide additional surface for surface-induced Hg 0 oxidations, (ii) reactive species (such as Cl) generated by plasma etching particle surface rapidly react with Hg 0 , and (iii) charged particles can in-flight adsorb mercury species.

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“…Dielectric barrier discharge (DBD), a type of AC corona discharge, has been well studied as a Hg 0 oxidation technique (Chen et al, 2006;Jeong and Jurng, 2007;Byun et al, 2008Byun et al, , 2011aByun et al, , 2011bKo et al, 2008c;Lin et al, 2010;Wang et al, 2010;Jiang et al, 2012). Similarly, DC corona discharge (Liang et al, 2002;Wang et al, 2009Wang et al, , 2011aWang et al, , 2013a and pulsed corona discharge (Liang et al, 1998;Ko et al, 2008aKo et al, , 2008bXu et al, 2009) have also been used to oxidize Hg 0 . Notably, corona discharge has additional beneficial effects other than Hg 0 oxidation.…”

Section: Introductionmentioning

confidence: 99%

Elemental mercury oxidation in an electrostatic precipitator enhanced with in situ soft X-ray irradiation

Wang

et al. 2014

Journal of the Air & Waste Management Association

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Corona discharge based techniques are promising approaches for oxidizing elemental mercury (Hg 0 ) in flue gas from coal combustion. In this study, in-situ soft X-rays were coupled to a DC (direct current) corona-based electrostatic precipitator (ESP). The soft X-rays significantly enhanced Hg 0 oxidation, due to generation of electrons from photoionization of gas molecules and the ESP electrodes. This coupling technique worked better in the positive corona discharge mode because more electrons were in the high energy region near the electrode. Detailed mechanisms of Hg 0 oxidation are proposed and discussed based on ozone generation measurements and Hg 0 oxidation behavior observations in single gas environments (O 2 , N 2 , and CO 2 ). The effect of O 2 concentration in flue gas, as well as the effects of particles (SiO 2 , TiO 2 , and KI) was also evaluated. In addition, the performance of a soft X-rays coupled ESP in Hg 0 oxidations was investigated in a lab-scale coal combustion system. With the ESP voltage at +10 kV, soft X-ray enhancement, and KI addition, mercury oxidation was maximized.Implications: Mercury is a significant-impact atmospheric pollutant due to its toxicity. Coal-fired power plants are the primary emission sources of anthropogenic releases of mercury; hence, mercury emission control from coal-fired power plant is important. This study provides an alternative mercury control technology for coal-fired power plants. The proposed electrostatic precipitator with in situ soft X-rays has high efficiency on elemental mercury conversion. Effects of flue gas conditions (gas compositions, particles, etc.) on performance of this technology were also evaluated, which provided guidance on the application of the technology for coal-fired power plant mercury control.

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Pulsed corona discharge for oxidation of gaseous elemental mercury

Cited by 26 publications

References 18 publications

Oxidation of Elemental Mercury by Active Species Generated From a Surface Dielectric Barrier Discharge Plasma Reactor

Oxidation of Elemental Mercury by Active Species Generated From a Surface Dielectric Barrier Discharge Plasma Reactor

Improving the Removal Efficiency of Elemental Mercury by Pre-Existing Aerosol Particles in Double Dielectric Barrier Discharge Treatments

Elemental mercury oxidation in an electrostatic precipitator enhanced with in situ soft X-ray irradiation

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