| Author | Sathe, Chirag Manohar |
| Call Number | AIT RSPR no.ET-93-01 |
| Subject(s) | Fluidized-bed combusion
|
| Note | A research study submitted in partial fulfillment of the requirements for the
Degree of Master of Engineering |
| Publisher | Asian Institute of Technology |
| Abstract | The low-grade fuels such as wood waste, sewage sludge are in abundance in nature and
if efficiently utilized, can largely alleviate the present and future energy problems. Circulating
fluidized bed has emerged as a new combustion technology, which can efficiently use low
grade fuels, incorporating concern for the environment. In the present study, an attempt is made
to study two aspects of hydrodynamics of Circulating fluidized bed, namely solid circulation
rate and axial voidage distribution.
The existing pilot plant was modified to understand the effect of reduced horizontal
length of L-valve. Sand of 200 μm, 400 μm and 500 μm and polystyrene were used as a raw
material for cold bed experiments. The experimental measurements were carried out in the
range of riser air flow from 1,700 Lt/min to 2,000 Lt/min; total bed inventories from 15 to 25
kg for sand particles and 10 and 12 kg for polystyrene particles and aeration flow from 60
Lt/min to 80 Lt/min for sand particles and from 100 Lt/min to 140 Lt/min for polystyrene.
Relevant correlation was developed for the present experimental work, using different
dimensionless groups, for solid circulation rate. The result of correlation was in agreement with
the experimental work. A general correlation was developed for the data gathered from
literature as well as for the data of present study. There was a qualitative agreement for the
developed general correlation.
Voidage were measured along the height of the riser column. Three models for axial
voidage distribution were studied in detail. A comparison was made with experimental work
for the model presented by Zhang et al (1992). A poor prediction of experimental data was
obtained which was not unexpected. |
| Year | 1993 |
| Type | Research Study Project Report (RSPR) |
| 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) | Exell, R.H.B.;Prida Wibulswas; |
| Scholarship Donor(s) | Royal Netherlands Government; |
| Degree | Research Studies Project Report (M.Eng.) - Asian Institute of Technology,1993 |