An equilibrium analysis to determine the speciation of trace elements in the flue gas from a coal-fired fluidized-bed boiler
Conference
·
OSTI ID:20006754
Knowledge of the speciation of trace elements in flue gases from coal combustion is important for describing their partitioning between gaseous and condensed phases generated during combustion, for predicting their releases from a burning coal particle, and for choosing suitable sorbents to decrease the emission of trace elements. An equilibrium analysis has been carried out to determine in detail the speciation of Hg, Se and As, which are reported to be the most volatile trace elements in the flue gas from coal combustion, depending on the temperature (400--1,800 K) and the atmosphere (reducing or oxidizing conditions). The principle of minimizing the Gibbs free energy of the system is applied to predict the partitioning of these elements, using the thermodynamic equilibrium computer code SOLGASMIX coupled with the GFEDBASE database. The chlorine content in the system affects greatly the stable forms, and the relative affinities of the three elements to chlorine are in the order: Se {gt} As {gt} Hg under oxidizing conditions at both high (1,100 K) and low (600 K) temperatures. The three elements co-existing system is considered in order to investigate the interactions between these elements, HgSe(g) and AsSe(g) are found to possibly exist as major species in the local CO-enriched zone in a boiler. The competitive reactions of the 3 considered elements to oxygen, hydrogen and chlorine are also discussed.
- Research Organization:
- CNRS-IMP, Font-Romeu (FR)
- OSTI ID:
- 20006754
- Report Number(s):
- CONF-990534--
- Country of Publication:
- United States
- Language:
- English
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