| Author | Rahman, A. N. M. Mizanur |
| Call Number | AIT RSPR no. ET-89-2 |
| Subject(s) | Biomass energy
|
| Note | A Research Study (12 Credits) 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 | A Batch type torrefactor having a capacity of 0 .113 m3 was
designed and fabricated. Torrefaction of sawdust briquettes and
wood chips (about 1 inch cube ) was carried out to study the
effect of duration time and temperature on yield , proximate
analysis and gross calorific value. The weight and energy loss
for torrefaction of saw dust briquettes was found to range from
6.2% to 29.7% and 4.6% to 21.0% respectively , for 2-4 hours
residence time. For wood chips these losses were 16 . 7% to 33.3%
and 10 . 4% to 23.5% , for 2-3 hours residence time. In both cases,
percent weight losses were more than energy losses.
Also, the torrefied and untorrefied briquettes and charcoal
were gasified in a downdraft wood/charcoal gasifier to study the
gasification characteristics. Th e gasification of untorrefied and
torrefied briquettes were comparable to wood gasification. No
significant difference in gas composition was noticed for
torrefied briquette gasification while torrefied briquettes
disintegrate less than unterrified briquettes after gasification.
A rotary drum heater was designed , fabricated and operated
with sun-dried sawdust to study the heating performance. Also,
the heater was coupled to a briquetting machine to study the
effect of pre -heating on energy consumption for briquetting
sawdust. The energy saving with preheating were: at 400°C die
temperature , 39.01% for motor & 25.68% for total power
consumption and at 350°C die temperature, 36.07% for motor &
30.23% for total power consumption.
A vertical electrical heater was also designed and
fabricated and operated with sun- dried rice husk and peanut shell
to study the technical feasibility and heating performance. |
| Year | 1989 |
| Type | Research Study Project Report (RSPR) |
| 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) | Exell, Robert H.B. ;Lasnier, F.
|
| Scholarship Donor(s) | Government of Switzerland; |
| Degree | Research Studies Project Report (M. Eng.) - Asian Institute of Technology, 1989 |