Capture of toxic metals by vaious sorbents during fluidized bed coal combustion

Conference · Sun Dec 31 04:00:00 EST 1995

OSTI ID:434415

Ho, T C; Ghebremeskel, A; Hopper, J R

This study investigated the potential of employing suitable sorbents to capture trace metallic substances during fluidized bed coal combustion. The objectives of the study were to demonstrate the capture process, identify effective sorbents, and characterize the capture efficiency. Experiments were carried out in a 25.4 mm (1 ``) quartz fluidized bed coal combustor enclosed in an electric furnace. In an experiment, a coal sample from the DOE Coal Sample Bank or the Illinois Basin Coal Sample Bank was burned in the bed with a sorbent under various combustion conditions and the amount of metal capture by the sorbent was determined. The metals involved in the study were arsenic, cadmium, lead, mercury and selenium, and the sorbents tested included bauxite, zeolite and lime. The combustion conditions examined included bed temperature, particle size, fluidization velocity (percent excess air), and sorbent bed height. In addition to the experimental investigations, potential metal-sorbent reactions were also identified through performing chemical equilibrium analyses based on the minimization of system free energy.

• Research Organization: Lamar Univ., Beaumont, TX (United States). Dept. of Chemical Engineering
• Sponsoring Organization: USDOE Assistant Secretary for Fossil Energy, Washington, DC (United States)
• DOE Contract Number: FG22-94PC94221
• OSTI ID: 434415
• Report Number(s): CONF-951180--4; ON: DE97000633
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
ADSORPTION
ARSENIC
BAUXITE
CADMIUM
CALCIUM OXIDES
CAPTURE
COAL
FLUIDIZED-BED COMBUSTION
FLUIDIZED-BED COMBUSTORS
LEAD
MERCURY
PARTICLE SIZE
SELENIUM
SORPTIVE PROPERTIES
ZEOLITES