| Author | Ranu Pentananunt |
| Call Number | AIT Thesis no. ET-89-15 |
| Subject(s) | Combustion
|
| Note | A thesis submitted in partial fulfillment of the requirement for
the degree of Master of Science |
| Publisher | Asian Institute of Technology |
| Abstract | Modifications were made on the fluidized bed rice husk
combustor for the combustion of small size (<3.35 mm) lignite.
Charcoal was used as start-up fuel. The effect of feed rate and
excess air level on combustible loss was determined.
Experimental results show that the combustion efficiency was high
(> 90 %) and there existed an optimum excess air level at which
maximum efficiency was achieved.
Testing of torrefied wood for various properties and
characteristics was carried out and compared with those of wood
and charcoal. The effect of torrefaction in upgrading wood to a
higher grade fuel was discussed. The results show that, while
having superior weight and energy yields, torrefied wood exhibits
a general trend of being an intermediate fuel between wood and
charcoal.
Thermogravimetric analysis was used to study the pyrolysis
and char combustion kinetics of wood, torrefied wood and
charcoal. Kinetic parameters were determined using the simple
first order integral method and the effect of heating rate
discussed. Each fuel showed its own unique TG curve. For
pyrolysis, heating rate showed little effect on the TG curve but
significantly affected the rate of volatile evolution. Good
agreement between model prediction and TG data was obtained with
two stage kinetics. At high heating rate, char combustion was
affected by mass transfer and the reaction became diffusion
controlled. |
| Year | 1989 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Department of Energy and Climate Change (Former title: Department of Energy, Environment, and Climate Change (DEECC)) |
| Academic Program/FoS | Energy Technology (ET) |
| Chairperson(s) | Bhattacharya, Sribas C.; |
| Examination Committee(s) | Mora, Jean-Claude;Prida Wibulswas |
| Scholarship Donor(s) | Government of Australia; |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 1989 |