الفهرس 
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Abstract
Fluidized Bed Combustor (FBC), which utilizes the phenomenon of
fluidization for the purpose of more efficient combustion, holds many promises
for both reducing the amount of agricultural residue disposal and improving
emissions from biomass combustion. In this research work, Egyptian sugarcane
bagasse and cotton stalks, powders were bumed in a Bubbling Fluidized Bed
Combustor (BFBC). The evaluation of design parameters of ~he fluidized bed
combustor, the analysis of the fluidizing phenomena, the combustion and
emissions characteristics, for sugarcane bagasse and cotton stalks fuels were
investigated and discussed throughout this work. Understanding how a fluidized
bed as a multi-phase flow system operates will improve its capabilities and
operations. Particle Size Distribution (PSD) and chemical kinetic are important
, ,
parameters used to characterize the hydrodynamic behavior and the combustion
characteristics of a biomass material inside the fluidized bed combustor.
The two biomass materials were collected and prepared for use and milled
in a milling machine to serve as a powder fuel. PSD for the two materials was
studied carefully to determine their physical characteristics that affected directly
the hydrodynamics, pyrolysis, and combustion of the two materials in the
BFBC. The PSD of the two biomass materials was calculated using three
different methods. These methods were sieving analysis, statistical calculations,
and image analysis (i.e. microscopy). Sieving analysis has been done
mechanically using a mechanical sieve shaker and a series of nested standard
sieves. A computer program called GRADIST AT has been used for the rapid
analysis of grain size statistics from the standard measuring sieving techniques,
and hand calculations were done for the satisfaction only.
The results of statistical calculations showed that the sugarcane bagasse
and cotton stalks samples were medium grained powders. The sieving analysis