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Statements

Subject Item
n2:RIV%2F61989100%3A27360%2F14%3A86091557%21RIV15-MSM-27360___
rdf:type
skos:Concept n15:Vysledek
dcterms:description
This work was conducted to evaluate whether Ca-bearing additives used during coal combustion can also help with the retention of some other elements. Since results described in the literature have usually been obtained by means of bench-scale/pilot-scale combustion facilities, this work focused on the evaluation of bottom ashes collected during four full-scale combustion tests at an operating thermal fluidized-bed power station. Bottom ashes were preferred to fly ashes for the study to avoid interference from condensation processes usually occurring in the post-combustion zone. This work focused on the behavior of S, Cl, Br, As, Mn, V, Cr, Ni, Cu, Zn, W, and Pb. Strong positive correlation with CaO content in bottom ashes was observed (for all four combustion tests) for S, As, Cl and Br (R = 0.917-0.999). Strong inverse proportionality was calculated between the contents of Pb, Zn, Ni, Cr and Mn and CaO content, so these elements showed association to materials other than Ca-bearing compounds (e.g. to aluminosilicates, organic matter etc.). Somewhat unclear behavior was observed for W, Cu, and V. Their correlation coefficients were evaluated as statistically “not significant”, i.e. these elements were not thought to be significantly associated with CaO. It was also discovered that major enrichment of CaO in the finest bottom ash fractions could be advantageously used for simple separation of elements strongly associated with these fractions, mainly S and As, but also Cl or Br. Removal of 5% of the finest ash particles brings about a decrease in As concentration down to 77%-80% of its original bulk ash content, which can be conveniently used e.g. when high As content complicates further ash utilization. This work was conducted to evaluate whether Ca-bearing additives used during coal combustion can also help with the retention of some other elements. Since results described in the literature have usually been obtained by means of bench-scale/pilot-scale combustion facilities, this work focused on the evaluation of bottom ashes collected during four full-scale combustion tests at an operating thermal fluidized-bed power station. Bottom ashes were preferred to fly ashes for the study to avoid interference from condensation processes usually occurring in the post-combustion zone. This work focused on the behavior of S, Cl, Br, As, Mn, V, Cr, Ni, Cu, Zn, W, and Pb. Strong positive correlation with CaO content in bottom ashes was observed (for all four combustion tests) for S, As, Cl and Br (R = 0.917-0.999). Strong inverse proportionality was calculated between the contents of Pb, Zn, Ni, Cr and Mn and CaO content, so these elements showed association to materials other than Ca-bearing compounds (e.g. to aluminosilicates, organic matter etc.). Somewhat unclear behavior was observed for W, Cu, and V. Their correlation coefficients were evaluated as statistically “not significant”, i.e. these elements were not thought to be significantly associated with CaO. It was also discovered that major enrichment of CaO in the finest bottom ash fractions could be advantageously used for simple separation of elements strongly associated with these fractions, mainly S and As, but also Cl or Br. Removal of 5% of the finest ash particles brings about a decrease in As concentration down to 77%-80% of its original bulk ash content, which can be conveniently used e.g. when high As content complicates further ash utilization.
dcterms:title
Effect of CaO on retention of S, Cl, Br, As, Mn, V, Cr, Ni, Cu, Zn, W and Pb in bottom ashes from fluidised-bed coal combustion power station Effect of CaO on retention of S, Cl, Br, As, Mn, V, Cr, Ni, Cu, Zn, W and Pb in bottom ashes from fluidised-bed coal combustion power station
skos:prefLabel
Effect of CaO on retention of S, Cl, Br, As, Mn, V, Cr, Ni, Cu, Zn, W and Pb in bottom ashes from fluidised-bed coal combustion power station Effect of CaO on retention of S, Cl, Br, As, Mn, V, Cr, Ni, Cu, Zn, W and Pb in bottom ashes from fluidised-bed coal combustion power station
skos:notation
RIV/61989100:27360/14:86091557!RIV15-MSM-27360___
n3:aktivita
n18:P
n3:aktivity
P(LO1203)
n3:cisloPeriodika
7
n3:dodaniDat
n12:2015
n3:domaciTvurceVysledku
n13:1051962 n13:2173220
n3:druhVysledku
n19:J
n3:duvernostUdaju
n8:S
n3:entitaPredkladatele
n4:predkladatel
n3:idSjednocenehoVysledku
13156
n3:idVysledku
RIV/61989100:27360/14:86091557
n3:jazykVysledku
n14:eng
n3:klicovaSlova
trace elements; fluidized-bed; retention; CaO; bromine; chlorine; arsenic; coal combustion
n3:klicoveSlovo
n7:bromine n7:fluidized-bed n7:coal%20combustion n7:CaO n7:trace%20elements n7:arsenic n7:chlorine n7:retention
n3:kodStatuVydavatele
CN - Čínská lidová republika
n3:kontrolniKodProRIV
[F7AFFC78793C]
n3:nazevZdroje
Journal of Environmental Sciences
n3:obor
n11:DI
n3:pocetDomacichTvurcuVysledku
2
n3:pocetTvurcuVysledku
2
n3:projekt
n10:LO1203
n3:rokUplatneniVysledku
n12:2014
n3:svazekPeriodika
26
n3:tvurceVysledku
Bartoňová, Lucie Klika, Zdeněk
n3:wos
000339036500008
s:issn
1001-0742
s:numberOfPages
8
n17:doi
10.1016/j.jes.2014.05.008
n16:organizacniJednotka
27360