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Speciation, behaviour, and fate of mercury under oxy-fuel combustion conditions.
- Source :
-
Environmental Research . Feb2016, Vol. 145, p154-161. 8p. - Publication Year :
- 2016
-
Abstract
- The work presented here reports the first study in which the speciation, behaviour and fate of mercury (Hg) have been evaluated under oxy-fuel combustion at the largest oxy-Pulverised Coal Combustion (oxy-PCC) demonstration plant to date during routine operating conditions and partial exhaust flue gas re-circulation to the boiler. The effect of the CO 2 -rich flue gas re-circulation on Hg has also been evaluated. Results reveal that oxy-PCC operational conditions play a significant role on Hg partitioning and fate because of the continuous CO 2 -rich flue gas re-circulations to the boiler. Mercury escapes from the cyclone in a gaseous form as Hg 2+ (68%) and it is the prevalent form in the CO 2 -rich exhaust flue gas (99%) with lower proportions of Hg 0 (1.3%). The overall retention rate for gaseous Hg is around 12%; Hg 0 is more prone to be retained (95%) while Hg 2+ shows a negative efficiency capture for the whole installation. The negative Hg 2+ capture efficiencies are due to the continuous CO 2 -rich exhaust flue gas recirculation to the boiler with enhanced Hg contents. Calculations revealed that 44 mg of Hg were re-circulated to the boiler as a result of 2183 re-circulations of CO 2 -rich flue gas. Especial attention must be paid to the role of the CO 2 -rich exhaust flue gas re-circulation to the boiler on the Hg enrichment in Fly Ashes (FAs). [ABSTRACT FROM AUTHOR]
- Subjects :
- *PULVERIZED coal
*COAL combustion
*BOILER fuel
*ENVIRONMENTAL chemistry
*FLUE gases
Subjects
Details
- Language :
- English
- ISSN :
- 00139351
- Volume :
- 145
- Database :
- Academic Search Index
- Journal :
- Environmental Research
- Publication Type :
- Academic Journal
- Accession number :
- 112016352
- Full Text :
- https://doi.org/10.1016/j.envres.2015.12.002