Experimental Study of Biomass Gasification in a Downdraft Gasifier Using Different Feedstocks
| dc.contributor.advisor | Abebayehu, Assefa (PhD) | |
| dc.contributor.author | Henok, Mekonnen | |
| dc.date.accessioned | 2020-12-01T04:56:03Z | |
| dc.date.accessioned | 2023-11-18T06:32:18Z | |
| dc.date.available | 2020-12-01T04:56:03Z | |
| dc.date.available | 2023-11-18T06:32:18Z | |
| dc.date.issued | 2012-02-19 | |
| dc.description.abstract | The primary interest of this research work is to study the gasification properties of different biomass feedstock materials which are easily available in Ethiopia. An overview of biomass is discussed in this paper so as to have a clue what chemical composition does a biomass material can have and its implication of energy conversion. The different types of conversion processes are also covered in order to show the possible ways that energy can be extracted from biomass and to compare their merits and demerits relative to gasification. A precise theoretical overview of gasification is dealt which has laid a very starting ground for what is done in the simulation and experimental works. Experimental investigation is an irreplaceable tool to get a very meaningful finding in this research even though simulation can give a good guidance and a pre insight. Simulation work alone can be misleading since many simplifying assumptions were taken in order to make it possible to simulate the very complicated thermo-chemical process inside the gasifier and also the still unclearly phenomenon of tar formation. Both simulation and experimental work are undertaken in this research. A Matlab program is used to simulate the effects of moisture content and equivalence ratio on the constituent gas composition of the produced gas. An algorithm based on a thermodynamic model with certain simplifying assumptions is used so that the Matlab program will not miss the physical outlook of the modeled gasification process. Tables and figures are generated which are suitable to see the effects of different parameters on the final output of the gasification process. An experimental investigation is undertaken using different feedstock materials. The experiments are being carried out for some selected biomass materials which are charcoal, sawdust, coffee husk and a mixture of sawdust and coffee husk. The effects of moisture content and equivalence ratio on the final syngas composition are studied. The amount and nature of tar produced while gasifying the different feedstock is also examined. A comparison of the simulation and experimental works is done and it was reasoned out what effects the deviation of the experimental result from that of the simulation work. It was also attempted to compare the simulation and experimental results with those in literatures. At the end recommendations and suggestion of future works are presented concerning the work of this research. | en_US |
| dc.identifier.uri | http://etd.aau.edu.et/handle/12345678/23745 | |
| dc.language.iso | en_US | en_US |
| dc.publisher | Addis Ababa University | en_US |
| dc.subject | Biomass gasification | en_US |
| dc.subject | Downdraft Gasifier | en_US |
| dc.title | Experimental Study of Biomass Gasification in a Downdraft Gasifier Using Different Feedstocks | en_US |
| dc.type | Thesis | en_US |