Mercury and SO3 Emissions in Oxy-fuel Combustion

Spörl, Reinhold; Maier, Jörg; Belo, Lawrence P.; Shah, Kalpit; Stanger, Rohan; Wall, Terry; Scheffknecht, Günter

doi:10.1016/j.egypro.2014.11.041

Cited by 23 publications

(14 citation statements)

References 41 publications

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“…Importantly, the obtained results seem to prove the common trends concerning mercury oxidation phenomenon in flue gases from combustion units, suggested in several independent full scale tests and measurements [3,5,8,[11][12].…”

Section: Resultssupporting

confidence: 73%

Lab-scale evaluation of possible mercury speciation in flue gas and mercury emission from combustion of pulverised solid fuels

Cholewiński

Rybak

2019

EPJ Web Conf.

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In this work a new lab-scale method dedicated to the evaluation of both concentration and oxidation level of mercury in flue gases from pulverised fuel fired boiler was proposed. To detect the abovementioned parameters, 2 main steps need to be evaluated. Firstly, a calorimeter bomb is utilised - by a proper implementation of mass balance of mercury within substrates and products, the quantity of oxidised mercury in gaseous products can be evaluated. Then, to simulate solid fuel fired power unit and to calculate mercury concentrations in flue gases, one of the stoichiometric mathematical models of combustion process must be applied. Early validation of the method showed considerable differences between solid fuels in mercury oxidation efficiencies and concentrations in flue gasses. Four examined fuels (lignite, hard coal and 2 types of solid biomass) was investigated. Calculated mercury concentrations in raw flue gas (>700°C) varied between 4 and 75 µg/m3ref. The lowest quantity of oxidised forms ofHg in flue gases were identified in the case of investigated lignite (27% of total Hg), while significantly higher – for selected hard coal (72%) and one type of biomass (with high chlorine concentration; up to 98%).

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Section: Resultssupporting

confidence: 73%

Lab-scale evaluation of possible mercury speciation in flue gas and mercury emission from combustion of pulverised solid fuels

Cholewiński

Rybak

2019

EPJ Web Conf.

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“…Such a behaviour would imply that the sulphur content on the coal in combustion process transformed to SO 2 and then in specific condition to SO 3 (Srivastava et al, 2014;Fleig et al, 2011;Sp€ orl et al, 2014). Higher sulphur contents in coal leading to higher SO 2 and therefore SO 3 levels.…”

Section: Resultsmentioning

confidence: 94%

NOx and SO2 emissions of coals, biomass and their blends under different oxy-fuel atmospheres

Moroń

Rybak

2015

Atmospheric Environment

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“…SO3 formed in flue gas is known to be responsible for low temperature corrosion in cold parts of the flue gas cleaning lines (Spörl et al, 2014). HCl exhibited a synergy-like effect in the extent of mercury gas oxidation.…”

Section: Fernandez-miranda Et Al (2014) Demonstrated That Reaction (mentioning

confidence: 99%

Mitigation of gaseous mercury emissions from waste-to-energy facilities: Homogeneous and heterogeneous Hg-oxidation pathways in presence of fly ashes

Rumayor

Svoboda

Švehla

et al. 2018

Journal of Environmental Management

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This study describes the main mechanisms that take part in the mercury homogeneous oxidation pathway in presence of some of the main reactive compounds formed during waste incineration processes (O, HCl, SO and NO). Series of model, synthetic dry flue gases were used to elucidate the effects of HCl, SO, NO and their proportions in the gas on mercury behaviour. Three samples of fly ash collected from a MSWI facility were characterized and evaluated both for Hg heterogeneous oxidation and Hg removal in a laboratory scale device. The results obtained in this study showed that homogeneous mercury oxidation in the models MSWI and coal combustion flue gas atmospheres was 52 ± 5% and 25%, respectively. SO, NO and HCl have a synergetic effect in Hg oxidation in presence of oxygen, but the main differences found are mainly caused by the strong influence of HCl and the likely inhibitory oxidation effects of SO. Surface area together with carbon and chloride content of the fly ashes were correlated with their capacity for Hg-heterogeneous oxidation and adsorption. The sample of fly ash with relatively high content of unburnt carbon and chlorine, and with BET surface (2.42 m/g) was able to remove up to 100% of Hg (g) during 300 min. The results obtained in this study provide a complete overview of the behaviour of mercury during MSWI processes and may help to clarify the fate/behaviour of mercury in a filter (e.g. electrostatic precipitator) providing a deeper knowledge about the impacts of fly ash properties on mercury fate in waste incineration.

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Mercury and SO3 Emissions in Oxy-fuel Combustion

Cited by 23 publications

References 41 publications

Lab-scale evaluation of possible mercury speciation in flue gas and mercury emission from combustion of pulverised solid fuels

Lab-scale evaluation of possible mercury speciation in flue gas and mercury emission from combustion of pulverised solid fuels

NOx and SO2 emissions of coals, biomass and their blends under different oxy-fuel atmospheres

Mitigation of gaseous mercury emissions from waste-to-energy facilities: Homogeneous and heterogeneous Hg-oxidation pathways in presence of fly ashes

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