This study presents the results of an experimental investigation
of wood combustion. Variables chosen for investigation
were fuel feed rate, fuel moisture content,
fuel particle size, excess air, fraction and temperature of
under-fire air. Data recorded during the experiments included
the composition and temperature of the combustion
products in the combustion chamber, particulate emissions
and combustible fraction of the particulate.
Most mathematical models describing the combustion of
wood particles require numerical solutions. For this investigation,
an alternative model was used to generate
closed form solutions for the determination of the burning
times for wood particles in the combustion chamber. The
model results were in good agreement with the experimental
findings.
The temperature profiles of combustion products within
the combustion chamber were closely estimated, using an analytical
model developed for this investigation. The composition profiles within the combustion chamber were estimated
with the use of a chemical equilibrium model. These
models were in good agreement with the experimental results
for the estimation of the oxygen and carbon dioxide contents
of the combustion products. The chemical equilibrium
model proved to be inadequate for the determination of the
NO[subscript x] and CO contents of the combustion products.
Based upon the experimental data, a linear regression
model was developed to investigate the variables affecting
the combustion process. A computer model was used to calculate
the temperature and composition of the combustion
products under adiabatic conditions. Over the range of the
variables considered, it was concluded that combustion efficiency
and particulate emissions were most influenced by
the factors that increased the volume and velocity of combustion
products in the chamber. Moreover, it was also
concluded that the part-load operation of the combustion
unit resulted in higher particulate emissions and lower
combustion efficiency. / Graduation date: 1991
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/37103 |
| Date | 02 May 1991 |
| Creators | Dadkhah-Nikoo, Abbas |
| Contributors | Bushnell, Dwight J. |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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