Mercury emissions from coal combustion in fluidized beds under oxy-fuel and air conditions: influence of coal characteristics and O2 concentration

In this work, the fate of mercury in a bubbling fluidized bed combustor working under oxy-combustion conditions has been studied and compared with air combustion. The influence of burning three different rank coals, with sulphur content ranging from 0.65 % to 5.17 %, on Hg partitioning has been stud...

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Authors: Izquierdo Pantoja, María Teresa, Obras-Loscertales, Margarita de las, Diego Poza, Luis F. de, García Labiano, Francisco, Mendiara, Teresa, Abad Secades, Alberto, Gayán Sanz, Pilar, Adánez Elorza, Juan
Format: article
Status:Versión aceptada para publicación
Publication Date:2017
Country:España
Institution:Consejo Superior de Investigaciones Científicas (CSIC)
Repository:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/157232
Online Access:http://hdl.handle.net/10261/157232
Access Level:Open access
Keyword:Mercury emissions
Oxycoal combustion
Fluidized bed
Limestone
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spelling Mercury emissions from coal combustion in fluidized beds under oxy-fuel and air conditions: influence of coal characteristics and O2 concentrationIzquierdo Pantoja, María TeresaObras-Loscertales, Margarita de lasDiego Poza, Luis F. deGarcía Labiano, FranciscoMendiara, TeresaAbad Secades, AlbertoGayán Sanz, PilarAdánez Elorza, JuanMercury emissionsOxycoal combustionFluidized bedLimestoneIn this work, the fate of mercury in a bubbling fluidized bed combustor working under oxy-combustion conditions has been studied and compared with air combustion. The influence of burning three different rank coals, with sulphur content ranging from 0.65 % to 5.17 %, on Hg partitioning has been studied. The presence of limestone as sorbent for SO2 capture as well as the concentration of O2 at the entrance of the combustor were also evaluated. Coal rank does not have a direct influence on coal partitioning. However, sulphur content of the coal is an important parameter to describe not only the high percentage of particle-bound mercury, up to 87 %, in presence of limestone but also the prevalence of Hg(0) as the main species in the gas phase when burning the lignite. The O2/CO2 ratio has little effect on Hg partitioning in experiments carried out in presence of limestone at 925 ºC (the optimum temperature for sorbent sulphating under oxy-combustion conditions) and little differences are found with air combustion at 850 ºC (the optimum temperature for sorbent sulphating under air combustion conditions). Percentage of particle-bound mercury shows a maximum at 925 ºC independently of the coal studied, which it is related with the maximum sulphur retention for each coal at this temperature.The financial support from Spanish Ministry of Science and Innovation (MICINN) and European Regional Development Funds (ref: ENE2011-23412 and CTQ2008-05399/PPQ) is duly recognized. M. de las Obras thanks MICINN for FPI fellowship grant.Peer reviewedElsevierEuropean CommissionMinisterio de Ciencia e Innovación (España)Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]201720172017info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Postprintinfo:eu-repo/semantics/acceptedVersionhttp://hdl.handle.net/10261/157232reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttp://dx.doi.org/10.1016/j.fuproc.2017.08.021Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/1572322026-05-22T06:33:51Z
dc.title.none.fl_str_mv Mercury emissions from coal combustion in fluidized beds under oxy-fuel and air conditions: influence of coal characteristics and O2 concentration
title Mercury emissions from coal combustion in fluidized beds under oxy-fuel and air conditions: influence of coal characteristics and O2 concentration
spellingShingle Mercury emissions from coal combustion in fluidized beds under oxy-fuel and air conditions: influence of coal characteristics and O2 concentration
Izquierdo Pantoja, María Teresa
Mercury emissions
Oxycoal combustion
Fluidized bed
Limestone
title_short Mercury emissions from coal combustion in fluidized beds under oxy-fuel and air conditions: influence of coal characteristics and O2 concentration
title_full Mercury emissions from coal combustion in fluidized beds under oxy-fuel and air conditions: influence of coal characteristics and O2 concentration
title_fullStr Mercury emissions from coal combustion in fluidized beds under oxy-fuel and air conditions: influence of coal characteristics and O2 concentration
title_full_unstemmed Mercury emissions from coal combustion in fluidized beds under oxy-fuel and air conditions: influence of coal characteristics and O2 concentration
title_sort Mercury emissions from coal combustion in fluidized beds under oxy-fuel and air conditions: influence of coal characteristics and O2 concentration
dc.creator.none.fl_str_mv Izquierdo Pantoja, María Teresa
Obras-Loscertales, Margarita de las
Diego Poza, Luis F. de
García Labiano, Francisco
Mendiara, Teresa
Abad Secades, Alberto
Gayán Sanz, Pilar
Adánez Elorza, Juan
author Izquierdo Pantoja, María Teresa
author_facet Izquierdo Pantoja, María Teresa
Obras-Loscertales, Margarita de las
Diego Poza, Luis F. de
García Labiano, Francisco
Mendiara, Teresa
Abad Secades, Alberto
Gayán Sanz, Pilar
Adánez Elorza, Juan
author_role author
author2 Obras-Loscertales, Margarita de las
Diego Poza, Luis F. de
García Labiano, Francisco
Mendiara, Teresa
Abad Secades, Alberto
Gayán Sanz, Pilar
Adánez Elorza, Juan
author2_role author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv European Commission
Ministerio de Ciencia e Innovación (España)
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Mercury emissions
Oxycoal combustion
Fluidized bed
Limestone
topic Mercury emissions
Oxycoal combustion
Fluidized bed
Limestone
description In this work, the fate of mercury in a bubbling fluidized bed combustor working under oxy-combustion conditions has been studied and compared with air combustion. The influence of burning three different rank coals, with sulphur content ranging from 0.65 % to 5.17 %, on Hg partitioning has been studied. The presence of limestone as sorbent for SO2 capture as well as the concentration of O2 at the entrance of the combustor were also evaluated. Coal rank does not have a direct influence on coal partitioning. However, sulphur content of the coal is an important parameter to describe not only the high percentage of particle-bound mercury, up to 87 %, in presence of limestone but also the prevalence of Hg(0) as the main species in the gas phase when burning the lignite. The O2/CO2 ratio has little effect on Hg partitioning in experiments carried out in presence of limestone at 925 ºC (the optimum temperature for sorbent sulphating under oxy-combustion conditions) and little differences are found with air combustion at 850 ºC (the optimum temperature for sorbent sulphating under air combustion conditions). Percentage of particle-bound mercury shows a maximum at 925 ºC independently of the coal studied, which it is related with the maximum sulphur retention for each coal at this temperature.
publishDate 2017
dc.date.none.fl_str_mv 2017
2017
2017
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Postprint
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/157232
url http://hdl.handle.net/10261/157232
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv http://dx.doi.org/10.1016/j.fuproc.2017.08.021
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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