Coal combustion experiments at a lab-scale furnace with a capacity of 10,000 kcal/h were conducted in order to investigate the speciation changes and mass distribution of mercury with limestone injection in conditions of air and oxy-fuel combustion. Mass distribution and concentration of mercury in flue gas at oxy-fuel combustion were higher than those at air combustion. With limestone injection, the reduction of mercury from flue gas by adsorption into limestone could be clearly observed at both air and oxy-fuel combustion conditions. In the speciation of mercury, the particulate mercury in flue-gas was dominant with around 50% and the portion of elemental mercury was higher than that of oxidized mercury as shown at other coal combustion cases. At oxy-fuel combustion, most of particulate mercury seemed to be bounded to limestone more easily in comparison to air combustion, so that the elemental mercury in flue gas resulted to be more dominant at oxy-fuel combustion.
Bibliographical noteFunding Information:
This study was supported by a collaborative research project of the National Research Foundation Grant ( NRF-616-2011-2-D0060 ). This research was also supported by the R&D project titled the “Environmental Control System Design for 100MW Oxy-PC Power Plant/Development of Environmental Control Techniques for Pollutants concentrated by FGR in Oxy-PC Power Plant/Fluidization Combustion Technology of Sludge and RDF using Mixture of Recirculating Flue-Gas and Oxygen” funded by the Korea Institute of Energy Technology Evaluation and Planning (KETEP). This work was partially funded by the Korean Ministry of Environment as the human resource development project for energy from waste and biomass recycling.
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)
- Fuel Technology
- Energy Engineering and Power Technology