Assessment of the Impact of Modification of Calcium Sorbents and the Possibility of Their Use in Desulfurization for Oxy-Fuel Combustion Process

The paper describes the possibilities of simple and effective modification of calcium sorbents used for flue gas desulfurization with a size between of 125–250 µm. The additives to the sorbents in the amount of 0.5% and 1.0% were inorganic sodium and lithium compounds. The research on the reactivity...

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Autores principales: Michał Wichliński, Renata Włodarczyk
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Publicado: MDPI AG 2021
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spelling oai:doaj.org-article:c657f1ad4b994706846d9c1291d9a6f02021-11-25T18:26:52ZAssessment of the Impact of Modification of Calcium Sorbents and the Possibility of Their Use in Desulfurization for Oxy-Fuel Combustion Process10.3390/min111112842075-163Xhttps://doaj.org/article/c657f1ad4b994706846d9c1291d9a6f02021-11-01T00:00:00Zhttps://www.mdpi.com/2075-163X/11/11/1284https://doaj.org/toc/2075-163XThe paper describes the possibilities of simple and effective modification of calcium sorbents used for flue gas desulfurization with a size between of 125–250 µm. The additives to the sorbents in the amount of 0.5% and 1.0% were inorganic sodium and lithium compounds. The research on the reactivity of sorbents was analyzed in the process of simultaneous calcination and sulfation at the temperature of 850 °C. The type of Na<sup>+</sup> or Li<sup>+</sup> cations and the inorganic salt anions have an influence on the modification of calcium sorbents in order to improve the efficiency of the calcination and sulfation process. Modification of calcium sorbents by adding inorganic sodium and lithium compounds, regardless of the amount, changes the reactivity coefficient RI [mol/mol] and the absolute sorption coefficient CI [g S/kg sorbent]. In the case of inorganic sodium salt (Additive 1), regardless of the amount of modifier added, there was a visible improvement in the reactivity of the sorbent: 1.0% of the additive caused an increase in the RI coefficient in relation to the raw sorbent by over 14%, and in the case of the CI coefficient by over 24%. Additional research was the analysis of the limestone behavior mechanism during the simultaneous calcination and sulfation (SCS) process under conditions of elevated temperature and with variable CO<sub>2</sub> and O<sub>2</sub> contents in the flue gas. The behavior of sorbents with a size distribution of 125–250 µm was assessed on the basis of the change in mass of the samples by determining the reactivity coefficient RI, [mol/mol] and the absolute sorption coefficient CI, [g S/kg sorbent]. Using the mercury porosimetry technique, the change in sorbent porosity in the subsequent stages of the simultaneous calcination and sulfation process was investigated. The process was carried out in the temperature range corresponding to the oxy-combustion (i.e., from 850 °C to 1000 °C).Michał WichlińskiRenata WłodarczykMDPI AGarticlecalcium sorbentsdesulfurizationchemical modificationoxy-fuel combustionporosityMineralogyQE351-399.2ENMinerals, Vol 11, Iss 1284, p 1284 (2021)
institution DOAJ
collection DOAJ
language EN
topic calcium sorbents
desulfurization
chemical modification
oxy-fuel combustion
porosity
Mineralogy
QE351-399.2
spellingShingle calcium sorbents
desulfurization
chemical modification
oxy-fuel combustion
porosity
Mineralogy
QE351-399.2
Michał Wichliński
Renata Włodarczyk
Assessment of the Impact of Modification of Calcium Sorbents and the Possibility of Their Use in Desulfurization for Oxy-Fuel Combustion Process
description The paper describes the possibilities of simple and effective modification of calcium sorbents used for flue gas desulfurization with a size between of 125–250 µm. The additives to the sorbents in the amount of 0.5% and 1.0% were inorganic sodium and lithium compounds. The research on the reactivity of sorbents was analyzed in the process of simultaneous calcination and sulfation at the temperature of 850 °C. The type of Na<sup>+</sup> or Li<sup>+</sup> cations and the inorganic salt anions have an influence on the modification of calcium sorbents in order to improve the efficiency of the calcination and sulfation process. Modification of calcium sorbents by adding inorganic sodium and lithium compounds, regardless of the amount, changes the reactivity coefficient RI [mol/mol] and the absolute sorption coefficient CI [g S/kg sorbent]. In the case of inorganic sodium salt (Additive 1), regardless of the amount of modifier added, there was a visible improvement in the reactivity of the sorbent: 1.0% of the additive caused an increase in the RI coefficient in relation to the raw sorbent by over 14%, and in the case of the CI coefficient by over 24%. Additional research was the analysis of the limestone behavior mechanism during the simultaneous calcination and sulfation (SCS) process under conditions of elevated temperature and with variable CO<sub>2</sub> and O<sub>2</sub> contents in the flue gas. The behavior of sorbents with a size distribution of 125–250 µm was assessed on the basis of the change in mass of the samples by determining the reactivity coefficient RI, [mol/mol] and the absolute sorption coefficient CI, [g S/kg sorbent]. Using the mercury porosimetry technique, the change in sorbent porosity in the subsequent stages of the simultaneous calcination and sulfation process was investigated. The process was carried out in the temperature range corresponding to the oxy-combustion (i.e., from 850 °C to 1000 °C).
format article
author Michał Wichliński
Renata Włodarczyk
author_facet Michał Wichliński
Renata Włodarczyk
author_sort Michał Wichliński
title Assessment of the Impact of Modification of Calcium Sorbents and the Possibility of Their Use in Desulfurization for Oxy-Fuel Combustion Process
title_short Assessment of the Impact of Modification of Calcium Sorbents and the Possibility of Their Use in Desulfurization for Oxy-Fuel Combustion Process
title_full Assessment of the Impact of Modification of Calcium Sorbents and the Possibility of Their Use in Desulfurization for Oxy-Fuel Combustion Process
title_fullStr Assessment of the Impact of Modification of Calcium Sorbents and the Possibility of Their Use in Desulfurization for Oxy-Fuel Combustion Process
title_full_unstemmed Assessment of the Impact of Modification of Calcium Sorbents and the Possibility of Their Use in Desulfurization for Oxy-Fuel Combustion Process
title_sort assessment of the impact of modification of calcium sorbents and the possibility of their use in desulfurization for oxy-fuel combustion process
publisher MDPI AG
publishDate 2021
url https://doaj.org/article/c657f1ad4b994706846d9c1291d9a6f0
work_keys_str_mv AT michałwichlinski assessmentoftheimpactofmodificationofcalciumsorbentsandthepossibilityoftheiruseindesulfurizationforoxyfuelcombustionprocess
AT renatawłodarczyk assessmentoftheimpactofmodificationofcalciumsorbentsandthepossibilityoftheiruseindesulfurizationforoxyfuelcombustionprocess
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