טכניון מכון טכנולוגי לישראל
הטכניון מכון טכנולוגי לישראל - בית הספר ללימודי מוסמכים  
M.Sc Thesis
M.Sc StudentAvraham Bat-Chen
SubjectThermochemical Research of Combustion of Biofuels and
Comparison to Fossil Fuel
DepartmentDepartment of Energy
Supervisor Professor Emeritus Yeshayahou Levy


Abstract

Biofuel is suggested as an alternative energy source. Biofuel is renewable, produced from plants or animal fat, hence biodegradable, non-toxic, sulfur and carcinogenic benzene free and most importantly, can reduce pollutant emissions and net CO2 emission since CO2 is required for photosynthesis . The main purpose of this research is a comparison between biofuels and fossil fuels aimed to determine the consequences of using biofuels over fossil fuels and to understand the engineering impacts of replacing the use of fossil fuels with biofuels. Investigation of fundamental parameters such as composition, pollutants and by-product emissions, combustion temperature, spray characteristics and combustion efficiency is of a great importance.

Two biofuels: Biodiesel and bio-synthetic paraffinic kerosene (bio-SPK) are compared with two fossil fuels: diesel and kerosene, respectively.

The methods for this research are both theoretical and experimental:

Theoretical analyses include the use of CHEMKIN-PRO, which enables simulation of chemical kinetics of complex reactions with multiple compounds. Ignition delay and adiabatic flame temperature of both biofuels and fossil fuels are investigated using CHEMKIN-PRO.

Experimental analysis methods are employed in the form of spray characteristics and fuel combustion:

-          Spray atomization has a significant role on combustion engine performance and emissions; hence quantitative measurement of the atomization performance is of great concern. Spray characteristics experiments are performed to measure the droplet size distribution, the average Sauter mean diameter (SMD) and to develop a new SMD to fuel pressure correlation.

-          Combustion experiments have a major importance for detection and characterization of the combustion products to verify the impact of using biofuels. These experiments and gas analysis are used to measure combustion temperatures, efficiencies and the emitted gases.