| Author | Chakrabarti, Nikhil Ranjan |
| Call Number | AIT Thesis no.ET-87-11 |
| Subject(s) | Biomass energy
|
| Note |
A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | In the first part of this study a theoretical estimation of pyrolysis
product distribution based on mass and energy balance considerations was
attempted with the assumption of pyrolysis phenomena to be autothermic.
Thermal analysis of sawdust was then carried out in the laboratory to
study wood pyrolysis phenomena qualitatively which showed that major
volatiles release from sawdust occurred in the temperature range 280 to
650 &sO.C .
In the next part of t he study equilibrium models were developed to
predict the gas composition and exit gas temperature from a cyclone reactor . These models were based on the mass , energy balance and equilibrium
constant s of the heterogeneous and homogeneous gasification reactions.
A kinetic rate model was then developed for the cyclone reactor to
predict the temperature and concentration profile inside t he reactor.
This model was formulated assuming the wood pyrolysis product distribution from t he literature and considering the gas phase reactions of the
volatiles inside the reactor under adiabatic condition.
This model prediction showed t he existence of annular high temperature
zones in the upper part of the reactor which gradually reduced along the
reactor and at the same time moved towards the center. It also showed that
reaction mostly occurred in the top portion of t he reactor and in the lower
part only mixing of the gases took place.
The model predictions showed similar t r end in t he variation of exit
gas composition as found from the experiment . However the predicted values
were much higher compared to the experimental results. This discrepancy
was probably because of (1) Input pyrolysis gas composition which was
taken from literature (2) Kinetic rate data of the various reactions as
obtained from literatures (3) Assumption of flow pattern inside t he
cyclone reactor (4) Possible measurement error. |
| Year | 1987 |
| 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) | Prida Wibulswas ;Lasnier, France
|
| Scholarship Donor(s) | Government of Australia / AIT |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1987 |