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Abstract: The objective of this study is to determine the mechanism of mercury retention in fly ashes, the main solid waste from coal combustion power plants, and to evaluate the interactions between the type of mercury and fly ashes. The work was based on the results of mercury speciation in the gas and the solid fly ash before and after mercury retention. The identification of the mercury species in the gas was performed using previously validated methods, but the speciation of the mercury retained in the fly ashes was carried out using a mercury temperature-programmed desorption technique (HgTPD) still under development. The fly ashes were sampled from conventional coal combustion in air and oxy-combustion power plants. The main mercury species identified in the raw fly ashes and after they were subjected to an oxy-combustion atmosphere were mercury bound to organic matter and HgS, the ratio of these species depending on the characteristics of the ashes. The results obtained indicate that fly ashes are the route of mercury oxidation in an oxy-combustion atmosphere, although they hardly retain any mercury unless the unburned carbon content is high. HgTPD analysis shows that the main mechanism for mercury retention in the fly ashes is via the carbon matter.
Fuente: Energy Fuels, 2015, 29 (4), 2227-2233
Publisher: American Chemical Society
Publication date: 01/04/2015
No. of pages: 7
Publication type: Article
DOI: 10.1021/ef502827g
ISSN: 0887-0624,1520-5029
Spanish project: CTM2011-22921
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FERNÁNDEZ MIRANDA, NURIA
MARTA RUMAYOR VILLAMIL
LÓPEZ ANTÓN, MARÍA ANTONIA
DÍAZ SOMOANO, MERCEDES
MARTÍNEZ TARAZONA, MARÍA ROSA
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