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The retention capacity for trace elements by the flue gas desulphurisation system under operational conditions of a co-combustion power plant

► The retention capacity of the FGD was studied in a co-combustion power plant. ► Water re-circulation increases the emission of particles in the gas OUT-FGD. ► Co-combustion enhances the formation of HgCl2 (g) and condensed species OUT-FGD. ► High gaseous retention (>83%) is attained for S, Cl,...

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Published in:Fuel (Guildford) 2012-12, Vol.102, p.773-788
Main Authors: Córdoba, Patricia, Font, Oriol, Izquierdo, María, Querol, Xavier, Leiva, Carlos, López-Antón, María Antonia, Díaz-Somoano, Mercedes, Ochoa-González, Raquel, Rosa Martinez-Tarazona, M., Gómez, Pedro
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cited_by cdi_FETCH-LOGICAL-c392t-411ca0d7179503172585ba9b292ec88829fa6fe15feabe6abf1e51c0f60fe893
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container_title Fuel (Guildford)
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creator Córdoba, Patricia
Font, Oriol
Izquierdo, María
Querol, Xavier
Leiva, Carlos
López-Antón, María Antonia
Díaz-Somoano, Mercedes
Ochoa-González, Raquel
Rosa Martinez-Tarazona, M.
Gómez, Pedro
description ► The retention capacity of the FGD was studied in a co-combustion power plant. ► Water re-circulation increases the emission of particles in the gas OUT-FGD. ► Co-combustion enhances the formation of HgCl2 (g) and condensed species OUT-FGD. ► High gaseous retention (>83%) is attained for S, Cl, F, As, and B by the plant. ► Gaseous Hg and particulate As, Zn, and Ni are the proportion emitted. Water re-circulation to the scrubber and co-combustion of coal with petroleum coke are the most significant factors that affect the retention capacity for trace elements in a power plant equipped with a forced-oxidation flue gas desulphurisation (FGD) system. The water re-circulation favours the progressive saturation of most elements in the gypsum slurry with the subsequent increase in emission by entraining particles and droplets in the outgoing gas of FGD (OUT-FGD). The co-combustion increases the content of HCl and SO2 in the gaseous stream, which enhances the formation of gaseous chlorides species, especially of Hg, and the formation of condensed species of Cu, Cr, Ni, Na, Cd, and Zn OUT-FGD, respectively. High gaseous retention capacity (83–100%) for S, Cl, F, As, and B is attained by the whole plant with a subsequent reduction in their gaseous emissions below the limits established by the European directive 2001/80/EC for large combustion plants, and also below the Pollutant Release and Transfer Register (PRTR) threshold values. The retention of Se increases from 2007 (75%) to 2008 (97%). The emissions of gaseous Hg and particulate As, Zn, and Ni exceed the PRTR values. Remediation actions for the gaseous and PM emissions are relevant given the role of the filtered water re-circulation increasing the particles emissions OUT-FGD.
doi_str_mv 10.1016/j.fuel.2012.06.059
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ispartof Fuel (Guildford), 2012-12, Vol.102, p.773-788
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1873-7153
language eng
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source ScienceDirect Journals
subjects Applied sciences
Co-combustion
Energy
Energy. Thermal use of fuels
Exact sciences and technology
FGD
Fuels
OUT-FGD gas
PRTR threshold value
Trace elements
title The retention capacity for trace elements by the flue gas desulphurisation system under operational conditions of a co-combustion power plant
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