| Author | Siddique, A. H. Md. Mizanur Rahman |
| Call Number | AIT Thesis no.ET-97-19 |
| Subject(s) | Biomass energy
|
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of
Engineering |
| Publisher | Asian Institute of Technology |
| Abstract | This report presents the results of the experiments carried out on a modified multi stage gasifier. The objectives of the study were to achieve a tar free gasifier start-up and to investigate the effects of wood chip moisture content (8.3%, 16.2%), air flow rate (80 to 120 l/min) and different wood species (Yang and Para wood) on multi-stage gasifier performance. In this study a charcoal gasifier and a floating drum gas storage system coupled to multi-stage gasifier were also used in an attempt to produce low tar gas. Performance measures included the gas composition and tar content of the producer gas. The results of the investigation revealed that increasing the wood chip moisture content resulted in increase of CO2 and H2 but decrease in CO concentration without significantly affecting the tar content in the producer gas. For a particular primary air flow rate, increase in the secondary air flow resulted in decrease in tar content as well as CO2 and H2 concentration while that of CO increases. Also, tar was produced at higher amount when the multi-stage gasifier was operated by using Para wood compared with Yang wood. It was found that the tar content of gas from a charcoal gasifier coupled to the multi stage gasifier was in the range 19-34 mg/Nm3. A floating drum gas storage system was also tested to study its effectiveness on condensing tar of the producer gas. With a three and a half hour retention time, tar content of the gas was reduced to only 9.24 mg/m3, which was 85% less than that obtained by using the multi-stage gasifier alone. |
| Year | 1997 |
| Type | Thesis |
| 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) | Surapong Chirarattananon;Kumar, Sivanappan |
| Scholarship Donor(s) | Government of France; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1997 |