Effects of Carbon Catalyzed Additives on Burning of Diesel and Heavy Fuel Oil

Abstract

Performance problems caused by contaminants in fuels can be avoided by treating the fuels with combustion performance additives such as BMES-H2 Carbon Catalyzed Liquid Various concentrations of fuel blends are prepared based on the suggestion of Rida Electric Company Ltd An investigation is performed into the combustion properties of diesel and heavy fuel oil by means of suspended droplet vaporization free falling droplet and spray combustion tests In general the suspended droplet results show that the droplets with fuel additive evaporate more rapidly than pure diesel droplets The results show that there is no expansion of the drops at T=300°C It is also found that under T=400°C expansion of the drops only occurs for diesel mixing with an additive concentration of 0 5 vol % 1 25 vol % respectively In addition it is also shown at T=500°C that for the fuel droplets with an additive concentration of more than 0 5 vol % the droplet undergoes an initial expansion before evaporation The results show that the droplets with fuel additive evaporate more rapidly than the pure heavy oil droplet The heavy fuel oil vaporization is affected by the addition of BMES-H2 fuel additive Results show that for 0 3 ~ 0 5 vol % of fuel additive into heavy fuel oil the drop slop is non-linear and changed to two different slopes By adding concentration over 0 5 vol % we found that the drop slope is similar to the heavy oil one In the free-falling droplet test the results show that there was some microexplosion and flame shrinkage for di?300μm The ignition point of the droplets with an initial diameter of di?300μm was better than di?500μm and di?700μm respectively Overall the results presented in this study suggest that an expansion of the drop size occurs prior to complete evaporation However the vaporization rate was not linear due to the effect of the expansion of the droplets The spray combustion experiments are performed using heavy fuel oil without and with fuel additives of concentration 0 5 vol % Results show that the presence of the additive contributes to the acceleration of pre-dissociation activity and also reduced the auto-ignition temperature of the fuel and improved the combustion stability

Date of Award	2014 Jul 1
Original language	English
Supervisor	Ta-Hui Lin (Supervisor)