| Author | Das, Rajesh |
| Call Number | AIT Thesis no. ET-90-5 |
| Subject(s) | Fluidized-bed combustion
|
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Abstract | Circulating Fluidized Bed (CFB) is a new technique
wide variety of fuels. This has attracted attention of
due to many advantages such as good turn down ratio,
efficiency and efficient pollution control .
for combusting a
many researchers
high combustion
In the present work, a generalised mathematical model has been
developed for the combustion of char taking into account the formation
of carbon dioxide and carbon monoxide during combustion. The present
model is a step further to the basic model given by BASU, SETT, GBORDZOE
(1987) and improvements incorporated by DAS (1989) in the form of variable
bed density along the combustor height . The model predicts the combustion
efficiency, the concentration of Oxygen, Carbon Dioxide, and Carbon
Monoxide in the flue gas, the exit particle size distribution and core
carbon fraction along the combustor height,
Modifications were performed on the existing pilot scale CFB
combustor by incorporating an expansion joint to reduce thermal stress
developed by unequal expansion between the main combustor and the return
leg.
The mathematical model has been validated by performing experiments
on a CFB combustor using char as a fuel. Model predictions have been done
by using the same conditions as the experimental conditions. The model
predictions are in agreement with the experimental results.
Experiments were conducted on a Fluidized Bed Combustor to study the
combustion efficiency and the sulphur retention capability of quick lime
and marbles tone used as sorbent with Thai lignite. Results show that
marblestone has a lower capability to retain sulphur than quick lime. The
results of sulphur retention with quick lime are encouraging. About 91%
of sulphur is retained from lignite in the bed. Combustion efficiency
with high sulphur lignite on the FBC is more than 90%. |
| Year | 1990 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Energy Technology (ET) |
| Chairperson(s) | Bhattacharya, Sribas C.; |
| Examination Committee(s) | Mora, Jean-Claude ;Prida Wibulswas ; |
| Scholarship Donor(s) | Canadian International Development Agency; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1990 |