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

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.
Authors:
; ;
Publication Date:
OSTI Identifier:
434415
Report Number(s):
CONF-951180-4
ON: DE97000633
DOE Contract Number:
FG22-94PC94221
Resource Type:
Conference
Resource Relation:
Conference: Annual meeting of the American Institute of Chemical Engineers, Miami Beach, FL (United States), 12-17 Nov 1995; Other Information: PBD: [1995]
Research Org:
Lamar Univ., Beaumont, TX (United States). Dept. of Chemical Engineering
Sponsoring Org:
USDOE Assistant Secretary for Fossil Energy, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; COAL; FLUIDIZED-BED COMBUSTION; BAUXITE; SORPTIVE PROPERTIES; ZEOLITES; CALCIUM OXIDES; ARSENIC; ADSORPTION; CADMIUM; LEAD; MERCURY; SELENIUM; FLUIDIZED-BED COMBUSTORS; CAPTURE; PARTICLE SIZE