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Biofuel are gaining increased public and scientific attention, driven by shortage of fossil fuels... more Biofuel are gaining increased public and scientific attention, driven by shortage of fossil fuels and greenhouse gas emissions. Biofuel have different physical and chemical characteristics in comparison with fuel oil used in general industrial applications. In order to maintain the same heating and emission characteristics, it is not recommended to burn biofuel directly in the industrial boilers or furnaces, but to burn them as a emulsion of biofuel and fuel oil instead. This research aims to examine the combustion characteristics and pollutant emissions of burning an emulsion of biofuel and fuel oils. This thesis was carried out with three main studies: (1) mixing stability between biofuel and diesel/heavy oil; (2) experimental study of single suspended droplet evaporation; (3) biofuel and heavyoil emulsion co-firing tests in furnace. Based on these experimental studies, the feasibility of co-firing biofuel with fuel oils can be evaluated to conclude with some strategies for burning biofuel. The experiments results are as described below.
Combustion characteristics and pollutant emissions of burning fast pyrolysis bio-oil/heavy fuel o... more Combustion characteristics and pollutant emissions of burning fast pyrolysis bio-oil/heavy fuel oil (HFO) blends in a 300-kW th furnace are investigated. Lauan (shorea) wood is used as biomass feedstock for making bio-oil via a fast pyrolysis process. The bio-oil has high viscosity, high water and oxygen content, as well as a low heating value. A furnace test is conducted for pure HFO and bio-oil/HFO blends with various mixing ratios. The results show that instability occurs during the test for cases with more than 5% bio-oil in the emulsion. Notably, it is verified that burning a bio-oil/HFO blend with a 2.5% bio-oil and a 97.5% HFO exhibits similar furnace performance and has lower NO and SO 2 emission levels as compared to burning pure HFO. The reductions of NO and SO 2 emissions are 2.6% and 7.9% for this blend, respectively.
Biofuel are gaining increased public and scientific attention, driven by shortage of fossil fuels... more Biofuel are gaining increased public and scientific attention, driven by shortage of fossil fuels and greenhouse gas emissions. Biofuel have different physical and chemical characteristics in comparison with fuel oil used in general industrial applications. In order to maintain the same heating and emission characteristics, it is not recommended to burn biofuel directly in the industrial boilers or furnaces, but to burn them as a emulsion of biofuel and fuel oil instead. This research aims to examine the combustion characteristics and pollutant emissions of burning an emulsion of biofuel and fuel oils. This thesis was carried out with three main studies: (1) mixing stability between biofuel and diesel/heavy oil; (2) experimental study of single suspended droplet evaporation; (3) biofuel and heavyoil emulsion co-firing tests in furnace. Based on these experimental studies, the feasibility of co-firing biofuel with fuel oils can be evaluated to conclude with some strategies for burning biofuel. The experiments results are as described below.
Combustion characteristics and pollutant emissions of burning fast pyrolysis bio-oil/heavy fuel o... more Combustion characteristics and pollutant emissions of burning fast pyrolysis bio-oil/heavy fuel oil (HFO) blends in a 300-kW th furnace are investigated. Lauan (shorea) wood is used as biomass feedstock for making bio-oil via a fast pyrolysis process. The bio-oil has high viscosity, high water and oxygen content, as well as a low heating value. A furnace test is conducted for pure HFO and bio-oil/HFO blends with various mixing ratios. The results show that instability occurs during the test for cases with more than 5% bio-oil in the emulsion. Notably, it is verified that burning a bio-oil/HFO blend with a 2.5% bio-oil and a 97.5% HFO exhibits similar furnace performance and has lower NO and SO 2 emission levels as compared to burning pure HFO. The reductions of NO and SO 2 emissions are 2.6% and 7.9% for this blend, respectively.