الفهرس 
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Abstract
Recently, the greenhouse effect has been the focus of attention of many
scientists; this is due to the increase in earth’s surface temperature in the
last century. Carbon dioxide is one of the main gases that cause global
warming, so CO2
capture techniques have been the focus of attention
these days. The Chemical-looping combustion (CLC) is one of these
techniques that do not waste energy during the process of CO
2
separation
and capture. It is unmixed combustion technique, because fuel and air
do not have a direct reaction. The oxygen is separated from the air by
using a metal powder, which is called oxygen-carrier and the process of
combustion is carried out by oxygen only. The product flue gases ”CO
2
and H
2
O” from the combustion of fuel leave the system as a stream. The
amount of H2
O can be easily removed by condensation. Therefore, pure
CO2
can be obtained without expensive energy for separation process.
from previous work, it is clear that chemical-looping combustion
technology can be applied as an efficient method for producing high
purity of CO2
. The aim of this study is to assess combustion of gaseous
and solid fuel in the chemical-looping combustion technology. This study
includes experimental and numerical approaches for using lignite coal and
liquefied petroleum gas (LPG) as solid and gaseous fuel respectively. The
experimental setup was designed and fabricated at the lab of combustion
in faculty of Engineering, Suez Canal University. The chemical-looping
combustor system involves two interconnected fluidized beds. Nickel
powder with 150-µm diameter was used as an oxygen carrier. The
gaseous fuel is LPG that consists of 60% propane (C
3H8
) and 40% butane
IV
(C
4H10). In addition, computational fluid dynamic (CFD) model was built
according to the experimental setup. The experimental and computational
simulation results were validated according to different statistical
methods such as the coefficient of determination (R
2
). The assessment of
combustion in this work is concentrated on measuring the products CO
and CO
2
then make a comparison of the results in the case of
conventional combustion and after the applying CLC technology. The
results in general showed that, with using the CLC technology the
combustion behavior was improved in case of using LPG as gaseous fuel
the color of the flame changed to blue and that is indicates to approaching
complete combustion flame. The CO was decreased by 49.1% and CO2
was increased by 66.5% compared with traditional combustion.
Moreover, in case of using lignite coal as solid fuel, CO was decreased by
53.7% and CO
2
was increased by 71.9% compared with traditional
combustion. In addition, the results showed that there is a good agreement
between the experimental and numerical results. .