Arsenic emissions and speciation in the oxy-fuel fly ash collected from lab-scale drop-tube furnace

Low, Fiona; Zhang, Lian

doi:10.1016/j.proci.2012.05.026

Cited by 30 publications

(20 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For As, this association corroborates the previously mentioned reaction with Ca to form calcium arsenate [26]. The relationship between Cr and Fe has also been suspected in previous literature [31].…”

Section: Statistical Analysis On the Associations Of A Trace Element supporting

confidence: 90%

“…This could be due to the previously demonstrated physical adsorption of free Ca on the silicate surface of the additive, thus occupying Ca active sites [15]. From literature studies, As has been shown into react/be captured by Ca, depending on the availability of its active sites, to form calcium arsenate [26]. A similar As RE factor between both the cases of without and with the silicabased additive for positions D and F2 indicates an As capture or condensation reaction occurring at about 300°C irrespective of additives which is then similarly collected by the ESP.…”

Section: Chromium Speciation By Xanesmentioning

confidence: 99%

See 1 more Smart Citation

Inhibition of lignite ash slagging and fouling upon the use of a silica-based additive in an industrial pulverised coal-fired boiler: Part 3 – Partitioning of trace elements

Low

Girolamo

et al. 2015

Fuel

Self Cite

View full text Add to dashboard Cite

Section: Statistical Analysis On the Associations Of A Trace Element supporting

confidence: 90%

Section: Chromium Speciation By Xanesmentioning

confidence: 99%

Inhibition of lignite ash slagging and fouling upon the use of a silica-based additive in an industrial pulverised coal-fired boiler: Part 3 – Partitioning of trace elements

Low

Girolamo

et al. 2015

Fuel

Self Cite

View full text Add to dashboard Cite

“…This work showed that higher O2 concentrations under oxy combustion induced lower trace element concentration in the form of fine PM. However, the work of Low and Zhang [112] showed that increased oxygen partial pressure favored the vaporization of arsenic, due to the increased particle temperature under elevated oxygen content. O2/CO2 combustion experiments conducted by Liu et al [113] with a tube furnace showed that the effect of O2 changed with temperature.…”

Section: O2mentioning

confidence: 99%

Review of arsenic behavior during coal combustion: Volatilization, transformation, emission and removal technologies

Wang

Liu

Zhang

et al. 2018

Progress in Energy and Combustion Science

163

View full text Add to dashboard Cite

Growing public awareness of the environmental impact of coal combustion has raised serious concerns about the various hazardous trace elements produced by coal firing. Arsenic deserves special attention due to its toxicity, volatility, bioaccumulation in the environment, and potential carcinogenic properties. As the main anthropogenic source of arsenic is coal combustion, its behavior in power plants is of concern. Unlike mercury, arsenic behavior in coal combustion has not been subjected to systematic, in-depth research. Different researchers have reached opposing conclusions about the behavior of arsenic in combustion systems and as yet there is relatively little research on arsenic-removal technologies. In this paper, the volatilization, transformation, and emission behavior of arsenic and its removal technologies are discussed in depth. Factors affecting the volatilization characteristics of arsenic are summarized, including temperature, pressure, mode of occurrence of arsenic, coal rank, mineral matter, and the sulfur and chlorine content of the fuel. The behavior of arsenic during oxy-fuel combustion and the effect of combustion atmosphere (O2, CO2, SO2 and H2O(g)) are also reviewed in detail. In order to better understand the pathway of arsenic in a power plant environment, a particular focus in this work is the transformation mechanism of ultra-fine ash particles and the partitioning behavior of arsenic. Finally, the effects of air pollution control devices (APCDs) on arsenic emissions are examined, along with the

show abstract

“…The standards considered here are arsenopyrite (FeAsS), orpiment (As 2 S 3 ), sodium arsenite (NaAs III O 2 ), and sodium arsenate (Na 2 HAs V O 4 ). Full details of the spectra collection and processing parameters are described elsewhere 28 and in the SI.…”

Section: Pairwise Correlation Coefficient Determinationmentioning

confidence: 99%

Emission of Organically Bound Elements during the Pyrolysis and Char Oxidation of Lignites in Air and Oxyfuel Combustion Mode

et al. 2014

Self Cite

View full text Add to dashboard Cite

This study aims to clarify the abundance of individual elements, particularly those in trace concentrations in lignites, and their emission dynamics during pyrolysis and char oxidation in both air and oxyfuel combustion modes. For this laboratory-scale study, the emission dynamics was represented by element release from the coal/char particle during thermal treatment in a drop-tube furnace. The main coal sample studied is a Victorian brown coal (VBC), which was compared with a Chinese lignite. Irrespective of elemental type, the VBC is rich in organically bound elements, which partly dissociated during the initial flash pyrolysis step. This dissociation extent varied broadly with elemental type. For element release during char oxidation, As release rates in both N 2 and CO 2 bulk gases were slower than char surface consumption rate, because of internal diffusion limitations and scavenging of a portion of As by Ca/Al/Fe-bearing discrete minerals. In contrast, the release rates of Pb from the char surface were faster than the carbon consumption rate. Releases of the remaining elements were simply in linear proportion to the char consumption rate for the two lignites studied, despite their differences in properties with no observable (element release) difference between air and oxyfuel combustion mode.

show abstract

Arsenic emissions and speciation in the oxy-fuel fly ash collected from lab-scale drop-tube furnace

Cited by 30 publications

References 17 publications

Inhibition of lignite ash slagging and fouling upon the use of a silica-based additive in an industrial pulverised coal-fired boiler: Part 3 – Partitioning of trace elements

Inhibition of lignite ash slagging and fouling upon the use of a silica-based additive in an industrial pulverised coal-fired boiler: Part 3 – Partitioning of trace elements

Review of arsenic behavior during coal combustion: Volatilization, transformation, emission and removal technologies

Emission of Organically Bound Elements during the Pyrolysis and Char Oxidation of Lignites in Air and Oxyfuel Combustion Mode

Contact Info

Product

Resources

About