Abatement of mercury emissions in the coal combustion process equipped with a Fabric Filter Baghouse

Cao, Yan; Cheng, Chin‐Min; Chen, Chien‐Wei; Liu, Mingchong; Wang, Chia-Wei; Pan, Wei‐Ping

doi:10.1016/j.fuel.2008.05.010

Cited by 54 publications

(30 citation statements)

References 10 publications

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“…Therefore, emissions of Hg 2+ , may be efficiently controlled by typical air pollution control devices (APCD), such as electrostatic precipitators (ESP), fabric filter (FF), and flue gas desulfurization (FGD) systems (US EPA, 1997EPA, , 2000bEPA, , 2002a. However, because the relative proportions of Hg 2+ , Hg p and Hg 0 can vary widely, the corresponding reductions in total mercury achieved by APCD vary (Pavlish et al, 2003;Srivastava et al, 2006;Lee et al, 2008;Cao et al, 2008a). For example, the removal efficiency of Hg from the flue gas by a combination of cold side ESP and wet FGD range from 24 to 70%.…”

Section: Introductionmentioning

confidence: 99%

Mercury emission and speciation of coal-fired power plants in China

et al. 2010

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Abstract.Comprehensive field measurements are needed to understand the mercury emissions from Chinese power plants and to improve the accuracy of emission inventories. Characterization of mercury emissions and their behavior were measured in six typical coal-fired power plants in China. During the tests, the flue gas was sampled simultaneously at inlet and outlet of Selective Catalytic Reduction (SCR), electrostatic precipitators (ESP), and flue gas desulfurization (FGD) using the Ontario Hydro Method (OHM). The pulverized coal, bottom ash, fly ash and gypsum were also sampled in the field. Mercury concentrations in coal burned in the measured power plants ranged from 17 to 385 µg/kg. The mercury mass balances for the six power plants varied from 87 to 116% of the input coal mercury for the whole system. The total mercury concentrations in the flue gas from boilers were at the range of 1.92-27.15 µg/m 3 , which were significantly related to the mercury contents in burned coal. The mercury speciation in flue gas right after the boiler is influenced by the contents of halogen, mercury, and ash in the burned coal. The average mercury removal efficiencies of ESP, ESP plus wet FGD, and ESP plus dry FGD-FF systems were 24%, 73% and 66%, respectively, which were similar to the average removal efficiencies of pollution control device systems in other countries such as US, Japan and South Korea. The SCR system oxidized 16% elemental mercury and reduced about 32% of total mercury. Elemental mercury, accounting for 66-94% of total mercury, was the dominant species emitted to the atmosphere. The mercury emission factor was also calculated for each power plant.

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Section: Introductionmentioning

confidence: 99%

Mercury emission and speciation of coal-fired power plants in China

et al. 2010

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“…Fly ash structure (the specifi c surface area) is also essential factor of lower Hg emission rates in the FBC units. The specifi c surface area of fl y ash from the FBCs (on average 15 m 2 /g) was generally higher than those from PC boilers (1-10 m 2 /g) (Cao et al 2008). The percentage of Hg 0 in the total Hg emission from the FBCs with fabric fi ltration was higher than for PC boilers equipped with FFs, averaging 56% versus 23% (Pavlish et al 2003).…”

Section: Mercury Speciation In Fl Ue Gasesmentioning

confidence: 91%

“…Therefore, Hg removals within PC boilers equipped with cold-side ESPs averaged 27%, compared to 4% for hot-side ESPs (Pavlish et al 2003). Mercury removals for FFs were generally higher than for ESPs, averaging 58%, owing to enhanced heterogeneous Hg oxidation (longer gas-solid contact time) (Cao et al 2008). Elemental mercury is the most diffi cult to capture, but selective catalytic reduction units (SCRs) are able to convert elemental mercury to oxidized form allowing it to be subsequently captured by wet fl ue gas desulphurization systems (FGDs).…”

Section: Mercury Speciation In Fl Ue Gasesmentioning

confidence: 97%

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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“…Mercury emission from coal-fired power plants account for one-third of the anthropogenic emissions [1]. There are three dominate forms of mercury in the combustion flue gas, elemental (Hg 0 ), oxidized (Hg 2?…”

Section: Introductionmentioning

confidence: 99%

Evaluation of elemental mercury adsorption by fly ash modified with ammonium bromide

Zhang

Lin

et al. 2015

J Therm Anal Calorim

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Coal-fired power plants are significant contributors to the anthropogenic emission of mercury. This study focus on evaluated the methods for modification and preparation of fly ash adsorbent which can be applied to adsorb mercury from power plants. Comparing with isometric impregnation and ion exchange method, it was found that the cost and preparation time of the mechanochemical method significantly reduced. Hg 0 adsorption performances of NH 4 Br-modified fly ashes and subsequent effects of mechanical energy on modifying fly ash were investigated, and the results indicated that increasing mechanical force can make the distribution of bromides to be more uniform and increase the number of surface active sites and groups. Furthermore, Hg 0 removal efficiency improved significantly with the increasing bromine loading at 150°C. There is a positive correlation between mechanical energy on modifying fly ash and subsequently Hg 0 adsorption performance. TG/MS analysis was utilized to determine the thermal stability and released material of different samples. Results demonstrated the release of ammonia, which from the modified fly ashes with mechanochemical method, most likely enhances the oxidation and subsequent adsorption of mercury in the 150-200°C temperature range. All results revealed that the mechanochemical application method for adsorbent preparation on site is competitive on economy, practicability, and mercury removal efficiency.

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Abatement of mercury emissions in the coal combustion process equipped with a Fabric Filter Baghouse

Cited by 54 publications

References 10 publications

Mercury emission and speciation of coal-fired power plants in China

Mercury emission and speciation of coal-fired power plants in China

Transformations of mercury in processes of solid fuel combustion – review

Evaluation of elemental mercury adsorption by fly ash modified with ammonium bromide

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