Effects of existing energy saving and air pollution control devices on mercury removal in coal-fired power plants

Zhou, Zijian; Liu, Xiaowei; Zhao, Bo; Chen, Zhenguo; Shao, Haizhong; Wang, Lele; Xu, Minghou

doi:10.1016/j.fuproc.2014.11.014

Cited by 93 publications

(41 citation statements)

References 47 publications

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“…The values of GHSV tested in the literature ranged from 2000 to 30,000 hr −1 for the SCR system employed by power plants Zhou et al, 2015;Buzanowski and Yang, 1990). In this experiment, the GHSVs were from 10,000 to 40,000 hr −1 for the poisoning tests, which were in the high range of operating condition to ensure that the catalysts can maintain their high performance for field application in the future.…”

Section: Effects Of Operating Conditions Of Mnfe-tnt(tio(oh) 2 )mentioning

confidence: 96%

Comparison of titania nanotubes and titanium dioxide as supports of low-temperature selective catalytic reduction catalysts under sulfur dioxide poisoning

Lee

Liou

Bai

2016

Journal of the Air & Waste Management Association

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A series of iron-manganese oxide catalysts supported on TiO and titanium nanotubes (TNTs) were studied for low temperature selective catalytic reduction (SCR) of NO with NH in the presence of SO The results showed that the specific surface area and the amount of Brønsted acid sites were highly correlated. The results also demonstrated that higher Mn/Mn ratios and larger specific surface areas might be the main reasons for the excellent performance of MnFe-TNTs catalyst after SO poisoning. The SO poisoning effect could be minimized by reducing the GHSV, increasing the reaction temperature, or increasing the [NH]/[NO] molar ratio. The results also indicated that the formation of ammonium sulfate had a stronger effect on the NO conversion efficiency as compared to the formation of metal sulfate. Thus operating the low temperature SCR at above 230 C to avoid the formation of ammonium sulfate would be the priority choice when SO poisoning is a concerned issue. Implications: Low-temperature selective catalytic reduction (SCR) has attracted increasing attention due to that it can reduce the energy consumption for the SCR process employed in industries such as steel plants and glass manufacturing plants. However, it also suffers from the sulfur dioxide (SO) poisoning problem. This study investigates the possibility of using titania nanotubes (TNTs) as the support of Mn/Fe bimetal oxide catalysts for low-temperature SCR to reduce the SO poisoning. The results indicated that the MnFe-TNT catalyst can tolerate SO for a longer time as compared with the MnFe-TiO catalyst.

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Section: Effects Of Operating Conditions Of Mnfe-tnt(tio(oh) 2 )mentioning

confidence: 96%

Comparison of titania nanotubes and titanium dioxide as supports of low-temperature selective catalytic reduction catalysts under sulfur dioxide poisoning

Lee

Liou

Bai

2016

Journal of the Air & Waste Management Association

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“…Hg 2+ is soluble in water and can be removed primarily in the form of HgCl 2 by the wet desulfurization system (WFGD) in coal-fired power plants [10]. Hg P can be removed with the fly ash in fabric filters (FF) and electrostatic precipitators (ESP) [11].…”

Section: Introductionmentioning

confidence: 99%

“…Recent DFT research indicates that the heterogeneous oxidation of Hg 0 and HCl on the catalyst surface follows the Langmuir–Hinshewood mechanism [10,25,26,27,28]. Nevertheless, to the best of our knowledge, few theoretical calculations were reported to investigate the reaction mechanism between Hg 0 and oxygen on the catalyst surface in detail, and there is no quantum chemistry study concerning the Hg + O 2 → HgO progress on the CeO 2 (111) surface to date.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of Mercury Adsorption and Oxidation by Oxygen over the CeO2 (111) Surface: A DFT Study

Zhao

Han

et al. 2018

Materials

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CeO2 is a promising catalytic oxidation material for flue gas mercury removal. Density functional theory (DFT) calculations and periodic slab models are employed to investigate mercury adsorption and oxidation by oxygen over the CeO2 (111) surface. DFT calculations indicate that Hg0 is physically adsorbed on the CeO2 (111) surface and the Hg atom interacts strongly with the surface Ce atom according to the partial density of states (PDOS) analysis, whereas, HgO is adsorbed on the CeO2 (111) surface in a chemisorption manner, with its adsorption energy in the range of 69.9–198.37 kJ/mol. Depending on the adsorption methods of Hg0 and HgO, three reaction pathways (pathways I, II, and III) of Hg0 oxidation by oxygen are proposed. Pathway I is the most likely oxidation route on the CeO2 (111) surface due to it having the lowest energy barrier of 20.7 kJ/mol. The formation of the HgO molecule is the rate-determining step, which is also the only energy barrier of the entire process. Compared with energy barriers of Hg0 oxidation on the other catalytic materials, CeO2 is more efficient at mercury removal in flue gas owing to its low energy barrier.

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“…The Hg-problem might become even more difficult for China where in 2010 the anthropogenic emission of mercury was estimated at roughly 576 Mg (i.e. over 35% of total global emission) [6]. It is estimated that the total emission of mercury yield somewhere between 5 and 15 thousand ton per year, and roughly 30-50% of that emission is of associated with human activity.…”

Section: Introductionmentioning

confidence: 99%

Mercury emissions from polish pulverized coalfired boiler

2017

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Abstract. The current paper presents the research results carried out at one of Polish power plants at a pulverized hard coal-fired 225 MW unit. The research was carried out at full load of the boiler (100% MCR) and focused on analysis of mercury content in the input fuel and limestone sorbent for wet flue gas desulfurization (FGD) system, as well as investigation of mercury content in the combustion products, i.e. fly ash, slag, FGD product (gypsum) and FGD effluents (waste). Within the framework of the present study the concentration of mercury vapor in the exhaust gas was also investigated. The analysis was performed using Lumex RA-915+ spectrometer with an attachment (RP-91C). The measurements were carried out at three locations, i.e. before the electrostatic precipitator (ESP), downstream the ESP, and downstream the wet FGD plant. Design of the measurement system allowed to determine both forms of mercury in the flue gas (Hg 0 and Hg 2+ ) at all measurement locations.Based on the measurement results the balance of mercury for a pulverized coal (PC) boiler was calculated and the amount of mercury was assessed both in the input solids (fuel and sorbent), as well as the gaseous and solids products (flue gas, slag, ash, gypsum and FGD waste).

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Effects of existing energy saving and air pollution control devices on mercury removal in coal-fired power plants

Cited by 93 publications

References 47 publications

Comparison of titania nanotubes and titanium dioxide as supports of low-temperature selective catalytic reduction catalysts under sulfur dioxide poisoning

Comparison of titania nanotubes and titanium dioxide as supports of low-temperature selective catalytic reduction catalysts under sulfur dioxide poisoning

Mechanism of Mercury Adsorption and Oxidation by Oxygen over the CeO2 (111) Surface: A DFT Study

Mercury emissions from polish pulverized coalfired boiler

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