Partitioning behavior of trace elements during pilot-scale combustion of pulverized coal and coal-water slurry fuel

Release pathways for inorganic hazardous air pollutants (IHAPs) from a pilo t-scale, down-fired combustor (DFC) when firing pulverized coal (PC) and co al-water slurry fuel (CWSF) were identified and quantified to demonstrate t he effect of fuel form on IHAP partitioning, enrichment and emissions. The baghouse capturing efficiency for each element was calculated to determine the effectiveness of IHAP emission control. Most of the IHAPs were enriched in the fly ash and depleted in the bottom ash. Mercury was found to be enr iched in the flue gas, and preferentially emitted in the vapor phase. When firing CWSF, more IHAPs were partitioned in the bottom ash than when Bring PC. Significant reduction of Hg emissions during CWSF combustion was also o bserved, (C) 2000 Elsevier Science B.V. All rights reserved.