FUEL 13 |
| Treated activated carbons have proven to be very effective in oxidizing and capturing elemental mercury. Pilot-scale experimental studies were performed to determine the effect of particle size and halogenation method on capture efficiency. Two different treated carbons, referred to as EERC-TC-1 and EERC-TC-2, were prepared and tested in a pilot-scale combustion facility burning subbituminous coal and Texas lignite in both electrostatic precipitator (ESP) and TOXECONTM configurations for environmental control. The brominated large particle EERC-TC-1, at an injection rate of 4.9 lb/Macf, showed >80% mercury capture in subbituminous flue gas with either ESP or TOXECONTM configurations, which is comparable with fine-particle sorbents. Addition of the fine-particle alternative halogenated carbon at 1.8 lb/Macf EERC-TC-2 injection into Texas lignite flue gas provided 28% and 58% mercury removals for ESP and TOXECONTM, respectively. Higher capture (>90%) was obtained using EERC-TC-2 added at 1.8 lb/Macf along with furnace additives to alter the flue gas composition. Both EERC carbons demonstrated improved performance for mercury oxidation and capture in ESP and TOXECONTM configurations compared to DARCO-Hg. |
|
Mercury and Other Trace Elements in Fuel: Emissions and Control
8:25 AM-11:35 AM, Sunday, April 6, 2008 Morial Convention Center -- Rm. 240/241, Oral
Sci-Mix
Division of Fuel Chemistry |