Combustion Of Urban Solid Wastes In An
Experimental Fluidized Bed Combustor
Author(s)
C. A. Torres-Balcazar, G. Lopez-Ocaña, R. G. Bautista-Margulis, J. R. Hernandez-Barajas,
H. O. Rubio-Arias & R. A. Saucedo-Teran
Abstract
Outdoor incineration of low-grade solid fuels is still an inadequate and common
practice in developing countries worldwide. To date, advanced combustion
systems, such as fluidized bed, have been successfully developed and
implemented to deal with these environmental issues. However, optimum
operating conditions have to be attained in order to reach the highest combustion
efficiency of each particular system. The objective of this investigation was to
study the combustion efficiency behaviour of urban solid wastes (USW) in an
experimental fluidized bed combustor under various operating conditions. Five
experimental tests were conducted by using USW collected in the city of
Villahermosa-Tabasco, Mexico. The experimental tests were carried out under
the following conditions: excess air of 281%, bed particle size of 0.8 mm and
static bed height of 0.2 m. The combustion efficiency varied from 54 to 82% at a
bed temperature between 770 and 914ºC, being significantly correlated to a
minimum square regression model (R2 = 0.87, p < 0.01). At bed temperatures
lower than 800ºC, the USW composition and heterogeneity affected the
combustion efficiency (54-64%), giving rise to an increase in CO emissions
(1,092 ppm). At bed temperatures greater than 870ºC, however, high combustion
efficiencies (80-82%) were achieved with maximum SO2 (18 ppm) and NO (11
ppm) emission levels complying with the maximum permissible levels
established in the Mexican environmental legislation (NOM-098-SEMARNAT).
The proposed experimental prototype was demonstrated to be both technically
and environmentally feasible for USW treatment via fluidized bed technology.
Keywords: combustion, urban solid waste, fluidized bed.
Keywords
combustion, urban solid waste, fluidized bed
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