Combustion Of Lignocellulosic Materials In An
Experimental Fluidized Bed System
Author(s)
G. Lopez-Ocaña, R. G. Bautista-Margulis,
J. R. Hernandez-Barajas, H. O. Rubio-Arias
& R. A. Saucedo-Teran
Abstract
Incineration via fluidized bed combustion is a worldwide technology used for the
thermal treatment of solid wastes with various calorific values. The objective of
the present investigation was to evaluate the combustion efficiency and gas
products from a three-phase combustor in order to thermally treat lignocellulosic
materials obtained from urban solid wastes generated in Villahermosa-Tabasco,
Mexico. The experiments were carried out in three sections: (EXP-1) the bed
temperature (Tb) was varied from 800 to 900°C, having a static bed height (Hs)
of 0.15 m; (EXP-2); same Tb range but Hs = 0.20 m; (EXP-3) same Tb range but
Hs = 0.25 m. Throughout the experiments, the combustor was operated with an
average excess air (XSA) of 168% and a mean bed particle size (Dp) of 0.8 mm.
The results revealed that the combustion efficiency varied from 73.6–82.6% for
Hs = 0.15 m, 78.4–87.9% for Hs = 0.20 m, and 80.1–90.6% for Hs = 0.25 m. At
Tb < 815°C and Hs = 0.15 m, low combustion efficiencies were obtained
(73–80%), with relatively high CO emissions (280–310 ppm). At Tb > 850°C
and Hs = 0.20–0.25 m, higher combustion efficiencies were attained (82–91%),
with maximum emission concentrations of CO (102 ppm), SO2 (13 ppm) and
NOx (17 ppm) that never exceeded the maximum permissible levels established
in the current Mexican environmental legislation. The prototype probed to be
technically and environmentally feasible for the treatment of lignocellulosic
materials via fluidized bed combustion.
Keywords: combustion, lignocellulosic residues, fluidized bed.
Keywords
combustion, lignocellulosic residues, fluidized bed.
Related Book
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