| Author | Talukdar, Jibeswar |
| Call Number | AIT Thesis no. ET-91-13 |
| Subject(s) | Fluidized-bed combustion
|
| Note | A thesis study submitted in partial fulfillment of the requirement .for the
degree of Master of Engineering, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. ET-91-13 |
| Abstract | This report is concerned with the theoretical and experimental study of
combustion in circulating fluidized and bubbling fluidized beds. The
theoretical p art includes modelling of l:he return leg of a circulating fluidized
bed combustor. The ma thematical modelling is done considering the reaction
to be kinetically controlled in order to estimate the extent of maximum possible
combustion in the return leg. It has been found that the combustion
phenomena in the return leg is not negligible although it is small compared
to reaction in the riser column.
Combustion in a circulating fluidized bed was studied with saw dust and
two different kinds of lignite. In case of saw dust the combustion efficiency
was high (86.6% - 99.3%). Lignite of small size containing a lot of fine
particles showed less efficiency compared to the lignite of courser size.
Combustion of a mixture of lignite and saw dust in a circulating fluidized bed
combustor has been found to give higher efficiency compared to lignite alone.
A study of calcination kinetics of limestone has been carried out using
thermogravimetric technique.
Combustion and sulphur retention experiments were done in a bubbling
fluidized bed and satisfactory sulphur retention efficiency was observed.
Upto 83.5% sulphur retention was observed using limestone of size 0.3 mm -
0.6 mm. The effectiveness of limestone of size 0.6 mm - 2.38 mm was observed
to be lower than that of the smaller size. The optimum temperature range for
maximum sulphur retention was 825 ·c to 840 ·c. |
| Year | 1991 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. ET-91-13 |
| Type | Thesis |
| School | School of Environment, Resources, and Development |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Energy Technology (ET) |
| Chairperson(s) | Bhattacharya, Sribas C.
; |
| Examination Committee(s) | Mora, Jean-Claude ;Surapong Chiraratananon ; |
| Scholarship Donor(s) | European Economic Community (EEC); |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1991 |