Photochemical Removal of Gaseous Elemental Mercury in a Dielectric Barrier Discharge Plasma Reactor

Yang, Hongmin; Líu, Hao; Hao, W.; Wang, Meng

doi:10.1007/s11090-012-9393-9

Cited by 24 publications

(14 citation statements)

References 20 publications

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“…However, it has been reported that TiO 2 particles fixed in a DBD reactor can react with corona discharge in the reactor and enhance mercury oxidation (Yang et al, 2012a(Yang et al, , 2012b, which is contrary to the results of this study. The explanation is that in the specific experimental conditions of Yang et al (2012aYang et al ( , 2012b, active sites containing OH functional groups were formed on the surface of TiO 2 under UV radiation, which resulted in Hg 0 oxidation. KI particles increased the Hg 0 conversion by introducing a new pathway for Hg 0 oxidation (Li et al, 2009a):…”

Section: Effect Of Particles In Flue Gascontrasting

confidence: 99%

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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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Section: Effect Of Particles In Flue Gascontrasting

confidence: 99%

“…Water vapor can enhance Hg 0 oxidation due to •OH radical generation under corona discharge (Ko et al, 2008a;Wang et al, 2009;Yang et al, 2012b). SO 2 and HCl also can enhance Hg 0 conversion (Figures S10 and S11).…”

Section: Effect Of Particles In Flue Gasmentioning

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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“…Among preoxidation technologies under development, advanced oxidation processes (AOPs) are receiving great emphasis on pollution control because of their ability to rapidly oxidize hazardous air pollutants [7,8]. Among the AOPs, non-thermal discharge plasmas (NTPs), which generate a large number of chemical active species such as ÁO and O 3 , have been developed as a new method applicable for processing waste gas [9,10], the removal of volatile organic compounds (VOCs) [11,12] and oxidizing Hg 0 [13][14][15][16][17]. NTP processes are highly effective in producing free radicals to enhance the removal of hazardous air pollutants.…”

Section: Introductionmentioning

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 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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“…Some results show that elemental mercury can be captured by adsorption of various adsorbents such as carbon-based materials, metal oxides, silica gel, biomass coke/ash, calcium-based materials, and natural mineral materials [2][3][4][5]. In addition, elemental mercury can be also effectively captured by various oxidation techniques [1,[6][7][8][9][10][11][12][13][14][15][16]. The basic principle is that elemental mercury in flue gas is first oxidized to divalent mercury, and then is washed in existing wet flue gas desulfurization devices [1,2,[7][8][9][10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

“…In addition, elemental mercury can be also effectively captured by various oxidation techniques [1,[6][7][8][9][10][11][12][13][14][15][16]. The basic principle is that elemental mercury in flue gas is first oxidized to divalent mercury, and then is washed in existing wet flue gas desulfurization devices [1,2,[7][8][9][10][11][12][13][14][15][16]. In accordance with the wetdry state of removal process, these oxidation technologies can be divided into dry and wet two categories [1,2,6].…”

Section: Introductionmentioning

confidence: 99%

Removal of Hg0 and simultaneous removal of Hg0/SO2/NO in flue gas using two Fenton-like reagents in a spray reactor

Liu

Zhou

Zhang

et al. 2015

Fuel

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Photochemical Removal of Gaseous Elemental Mercury in a Dielectric Barrier Discharge Plasma Reactor

Cited by 24 publications

References 20 publications

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

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

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

Removal of Hg0 and simultaneous removal of Hg0/SO2/NO in flue gas using two Fenton-like reagents in a spray reactor

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