Retención de compuestos gaseosos de Hg, As y S en sorbentes sólidos: aplicación a la combustión y gasificación de carbón

Retención de compuestos gaseosos de Hg, As y S en sorbentes sólidos: aplicación a la combustión y gasificación de carbón

Tesis doctoral presentada en el Departamento de Química Orgánica e Inorgánica de la Universidad de Oviedo, 2004.

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Bibliographic Details
Main Author: López Antón, María Antonia
Other Authors: Martínez Tarazona, Rosa María
Format: tesis doctoral biblioteca
Language:Spanish / Castilian
Published: 2014-06-20
Subjects:Mercury, Mercurio, Arsenic, Arsénico, Selenio, Selenium, Coal combustion, Sorbents,
Online Access:http://hdl.handle.net/10261/98650
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spelling dig-incar-es-10261-986502017-11-21T10:53:46Z Retención de compuestos gaseosos de Hg, As y S en sorbentes sólidos: aplicación a la combustión y gasificación de carbón López Antón, María Antonia Martínez Tarazona, Rosa María Mercury Mercurio Arsenic Arsénico Selenio Selenium Coal combustion Sorbents Tesis doctoral presentada en el Departamento de Química Orgánica e Inorgánica de la Universidad de Oviedo, 2004. Most elements can be found in coal in different proportions and modes of ocurrence. Although some of them occur in concentrations at the trace element level, they are considered of environmental concern. During coal combustion and gasification, different proportions of mercury, arsenic and selenium toxic compounds, may evaporate or condense on the minute fly ash particles in different proportions. They are then emitted with flue gases into the environment. Mercury and selenium compounds are mostly or entirely emitted in the vapour phase, whereas arsenic is mainly carried out with flue gases in the particulate matter. Although the evaluation of the emissions of these elements from coal utilization processes is at present an issue for discussion, coal combustion may be considered an important antropogenic source of these elements for the environment. However, there is a lack of a similar knowledge concerning the behaviour of these elements at the reducing conditions typical of coal gasification processes. To avoid possible problems from the accumulated emission of toxic trace elements, efficient gas cleaning systems capable of reducing the mercury, arsenic and selenium content in gases produced in coal combustion and gasification need to be developed. The systems currently being studied and developed for gas cleaning, focus on the use of solids sorbents. For this reason the main objective of this project was to develop and ascertain the capability of i) different activated carbons, some of them impregnated with sulphur, and ii) fly ash wastes produced in coal utilization processes, to retain mercury, arsenic and selenium compounds. To attain this objective an experimental study in typical coal combustion and gasification atmospheres was carried out. Different variables were evaluated for the capture. The Hg, Se and As species considered were those theoretically predicted according with thermodynamic equilibrium data. Two commercial activated carbons: Norit RB3 and Norit RBHG3 and three carbons prepared for the activation of a pyrolysed coal (CA, CASU and CAPSU) were evaluated. The fly ashes used came from different sources. The fluidised bed combustion of a bituminous coal (CTP), and a pulverized combustion plant (CTA) fed using with high rank coals. These materials were characterised before and after the experiments by different techniques. The efficiency of the sorbents in different conditions was determined in a laboratory scale reactor, using synthetic gas mixtures, typical of coal combustion and gasification processes. Retention capacity means of was determined by analyzing the solid sorbent after the experiment by means of ICP-MS, ICP-MS/HG, AAS/HG, AAS/CV and an automatic mercury analyser, AMA 254. The results obtained indicated that commercial activated carbons are the best sorbents for elemental mercury retention, while for HgCl2 retention capacity depended on the conditions and type of activated carbon and fly ashes. The retention of arsenic and selenium is always more effective in fly ashes than in activated carbons. In this work it was observed that retention in both coal a combustion and gasification atmosphere is similar, except in case of selenium where retention in a gasification atmosphere is significantly higher than in a combustion atmosphere. Probably, these retentions take place through different mechanisms, but in most of the cases a chemical reaction such as S-Hg, Ca/Fe-As and Ca/Fe-Se occurs. Peer reviewed 2014-06-20T08:01:28Z 2014-06-20T08:01:28Z 2014-06-20 tesis doctoral http://purl.org/coar/resource_type/c_db06 http://hdl.handle.net/10261/98650 es Sí open
institution INCAR ES
collection DSpace
country España
countrycode ES
component Bibliográfico
access En linea
databasecode dig-incar-es
tag biblioteca
region Europa del Sur
libraryname Biblioteca del INCAR España
language Spanish / Castilian
topic Mercury
Mercurio
Arsenic
Arsénico
Selenio
Selenium
Coal combustion
Sorbents
Mercury
Mercurio
Arsenic
Arsénico
Selenio
Selenium
Coal combustion
Sorbents
spellingShingle Mercury
Mercurio
Arsenic
Arsénico
Selenio
Selenium
Coal combustion
Sorbents
Mercury
Mercurio
Arsenic
Arsénico
Selenio
Selenium
Coal combustion
Sorbents
López Antón, María Antonia
Retención de compuestos gaseosos de Hg, As y S en sorbentes sólidos: aplicación a la combustión y gasificación de carbón
description Tesis doctoral presentada en el Departamento de Química Orgánica e Inorgánica de la Universidad de Oviedo, 2004.
author2 Martínez Tarazona, Rosa María
author_facet Martínez Tarazona, Rosa María
López Antón, María Antonia
format tesis doctoral
topic_facet Mercury
Mercurio
Arsenic
Arsénico
Selenio
Selenium
Coal combustion
Sorbents
author López Antón, María Antonia
author_sort López Antón, María Antonia
title Retención de compuestos gaseosos de Hg, As y S en sorbentes sólidos: aplicación a la combustión y gasificación de carbón
title_short Retención de compuestos gaseosos de Hg, As y S en sorbentes sólidos: aplicación a la combustión y gasificación de carbón
title_full Retención de compuestos gaseosos de Hg, As y S en sorbentes sólidos: aplicación a la combustión y gasificación de carbón
title_fullStr Retención de compuestos gaseosos de Hg, As y S en sorbentes sólidos: aplicación a la combustión y gasificación de carbón
title_full_unstemmed Retención de compuestos gaseosos de Hg, As y S en sorbentes sólidos: aplicación a la combustión y gasificación de carbón
title_sort retención de compuestos gaseosos de hg, as y s en sorbentes sólidos: aplicación a la combustión y gasificación de carbón
publishDate 2014-06-20
url http://hdl.handle.net/10261/98650
work_keys_str_mv AT lopezantonmariaantonia retenciondecompuestosgaseososdehgasysensorbentessolidosaplicacionalacombustionygasificaciondecarbon
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