The release of mercury from polish coals during thermal treatment of fuels in a fluidized bed reactor

Wichliński, Michał; Kobyłecki, Rafał; Bis, Zbigniew

doi:10.1016/j.fuproc.2013.10.011

Cited by 15 publications

(17 citation statements)

References 11 publications

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“…The first group includes methods of removing mercury from the exhaust gases. The second group includes methods of reducing mercury content in coal before its utilization, such as: coal cleaning [12][13][14], mild pyrolysis [15][16][17], selective mining [13,[18][19][20], sub-critical water extraction [21,22], leaching with SO 2 [23], bioleaching [24,25], or the HyperCoal process [26,27]. The effectiveness of these methods is strongly determined by various forms of mercury occurrence in coal, resulting from the genetic diversity of coal, i.e.…”

Section: Introductionmentioning

confidence: 99%

Studies of the correlation between mercury content and the content of various forms of sulfur in Polish hard coals

Dziok

Strugała

Rozwadowski

et al. 2015

Fuel

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Section: Introductionmentioning

confidence: 99%

Studies of the correlation between mercury content and the content of various forms of sulfur in Polish hard coals

Dziok

Strugała

Rozwadowski

et al. 2015

Fuel

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“…The mechanism of the mercury oxidation in the presence of chlorine has not yet been unambiguously determined, but numerous studies show both homo-and heterogeneous mechanisms of the reaction between mercury and other fl ue gas components (Niksa et al 2001, Zhao et al 2006. The scheme of individual reactions depends on the coal characteristics (mineral and chemical composition), fl ue gas composition, process conditions, as well as the rate of fl ue gas cooling (Frandsen et al 1994, Ariya et al 2002, Senior and Johnson 2005, Wichliński et al 2014. For example, Jang and co-workers (Jang et al 2014) proved the impact of limestone injection on the kinetics of mercury oxidation.…”

Section: Mercury Speciation In Fl Ue Gasesmentioning

confidence: 99%

“…There is a signifi cant impact of temperature and composition of fl ue gas on the kinetics and the mechanism of the Hg oxidation reaction (Rizeq et al 1994, Widmer et al 1998, Galbreath and Zygarlicke 2000, Ariya et al 2002, Pavlish et al 2003, Cauch et al 2008, Jang et al 2014, Ticknor et al 2014. In a majority of cases, it is assumed that in the processes of thermal decomposition at the combustion temperature the chlorine in coal is released in a form of strongly reactive atomic chlorine (Horne et al 1968, Frandsen et al 1994, Widmer et al 1998, Procaccini et al 2000, Ariya et al 2002, Wichliński et al 2014, Jang et al 2014. Cooling of the fl ue gas causes reactions which result in the formation of Cl 2 and HCl.…”

Section: Mercury Speciation In Fl Ue Gasesmentioning

confidence: 99%

Transformations of mercury in processes of solid fuel combustion – review

Czaplicka¹,

Pyta²

2017

Archives of Environmental Protection

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Abstract:The paper presents current reports on kinetics and mechanisms of reactions with mercury which take place in the exhaust gases, discharged from the processes of combustion of solid fuels (coals). The three main stages were considered. The fi rst one, when thermal decomposition of Hg components takes place together with formation of elemental mercury (Hg 0 ). The second one with homogeneous oxidation of Hg 0 to Hg 2+ by other active components of exhaust gases (e.g. HCl). The third one with heterogeneous reactions of gaseous mercury (the both -elemental and oxidised Hg) and solid particles of fl y ash, leading to generation of particulate-bound mercury (Hg p ). Infl uence of exhaust components and their concentrations, temperature and retention time on the effi ciency of mercury oxidation was determined. The issues concerning physical (gas-solid) and chemical speciation of mercury (fractionation Hg 0 -Hg 2+ ) as well as factors which have infl uence on the mercury speciation in exhaust gases are discussed in detail.

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“…Precombustion technology was developed due to its high mercury removal efficiency and easy operation . The author reported that the Hg removal efficiency by pyrolysis was affected by many factors, such as the type of coal, pyrolysis atmosphere, pyrolysis temperature, particle size of coal, residence time in reactor, and heating rate.…”

Section: Introductionmentioning

confidence: 99%

Mercury occurrence modes in coal and the sulfur–mercury removal performance during coal pyrolysis

Zhang

Dong

et al. 2019

Asia-Pacific J Chem Eng

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The mild pyrolysis of coal provided a promising alternative method for mercury and sulfur emission control before coal combustion. In the work, the occurrence modes of mercury in one lignite and two bituminous coals were characterized by temperature-programmed decomposition with acid leaching. The removal performance of sulfur-mercury was also investigated by mild pyrolysis under weak oxidizing atmosphere. The results showed that the contents of organic-bound mercury, pyrite-bound mercury, and ash-bound mercury were in the range of 35-55%, 15-45%, and 10-45%, with their release temperature in the range of 250-650, 500-700, and >700°C, respectively. Sulfur and mercury were removed by fast pyrolysis at 500°C under 2%O 2 − N 2 atmosphere, and the proportion of Hg 2+ in gas phase increased. The results indicated that the oxygen had participated in the decomposition of the mercury-containing and sulfur-containing compounds, and some stable mercury-containing and sulfur-containing compounds were easier for decomposition under weak oxidizing atmosphere at low temperature. The removal efficiency of sulfur and mercury significantly increased under weak oxidizing atmosphere by fast pyrolysis. It was because fast pyrolysis could accelerate the breakup of molecular bonds associated with sulfur-mercury at a low temperature. The pore structure of char produced by fast pyrolysis was improved, which was favorable for sulfur containing gas and mercury release.

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The release of mercury from polish coals during thermal treatment of fuels in a fluidized bed reactor

Cited by 15 publications

References 11 publications

Studies of the correlation between mercury content and the content of various forms of sulfur in Polish hard coals

Studies of the correlation between mercury content and the content of various forms of sulfur in Polish hard coals

Transformations of mercury in processes of solid fuel combustion – review

Mercury occurrence modes in coal and the sulfur–mercury removal performance during coal pyrolysis

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