WIT Press


Combustion Of Lignocellulosic Materials In An Experimental Fluidized Bed System

Price

Free (open access)

Paper DOI

10.2495/WM080301

Volume

109

Pages

10

Page Range

279 - 288

Published

2008

Size

359 kb

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.