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Design of burner and study of combustion characteristics of pyrolysis oil from biomass

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dc.contributor.author Lujaji, Frank Clement
dc.date.accessioned 2019-05-31T05:21:08Z
dc.date.available 2019-05-31T05:21:08Z
dc.date.issued 2017-12
dc.identifier.uri http://dspace.nm-aist.ac.tz/handle/123456789/265
dc.description A Dissertation Submitted in Partial Fulfilment of the Requirements for the Degree of Doctor of Philosophy in Sustainable Energy Science and Engineering of the Nelson Mandela African Institution of Science and Technology en_US
dc.description.abstract Conversion of biomass to fuel provides a positive contribution for fossil fuel replacements. In addressing challenges associated with the combustion of pyrolysis oil (bio-oil), this research aimed at developing a burner system that would handle the atomization and combustion of biooil. This research started by conducting a spray study in order to explore the potential for bio-oil combustion in industrial furnaces. Spray experiments were conducted by using different sizes of externally mixed nozzles with bio-oil and ethanol blends. Results revealed that it is possible to spray bio-oil/ethanol mixtures containing as high as 40% bio-oil that has a low water content (12.6%). The design of the furnace for the combustion of bio-oil followed, this was done based on the industrial standard methods. The furnace was modelled in a computer aided design (CAD) software, the design analysis and engineering drawings were prepared followed by the fabrication and instrumentation. The furnace was then tested with bio-oil and diesel fuel prior to full scale combustion study. Building on the spray study, the comparative study of bio-oil and diesel combustion at different equivalence ratio values were conducted. It was revealed that it is possible to burn neat bio-oil in a tunnel-like furnace with a self sustaining flame. Bio-oil combustion recorded higher, carbon monoxide (CO), nitrogen oxides (NOx) and hydrocarbon (HxCy) emissions when compared to those of diesel. A follow-up combustion study with oxygen enriched atomization revealed that it was possible to fire neat bio-oil with a significant reduction of pollutants emissions. ii Based on the results from this research, it can be concluded that it is possible to burn 100% biooil in an industrial sized burner. On the other hand, oxygen enriched combustion help in reducing emissions levels in the exhaust. Therefore, the use of bio-oil as fuel in an industrial scaled furnace is now possible. en_US
dc.language.iso en_US en_US
dc.publisher NM-AIST en_US
dc.subject Research Subject Categories::NATURAL SCIENCES en_US
dc.title Design of burner and study of combustion characteristics of pyrolysis oil from biomass en_US
dc.type Thesis en_US


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