| Summary: | 碩士 === 國立中正大學 === 機械工程所 === 98 === The main purpose of this research project aims to investigate the combustion characteristics of Diesel blended with different ratio of Tyre Pyrolysis Oil (TPO) in a diesel engine. Researchers set up a combustion chamber and a four-stroke diesel engine with a dynamometer, observing its fuel-air ratio change and the concentration of emission gas, and explored the possibility of utilizing TPO as an alternative to diesel engine.
In this study, the combustion characteristics of Biodiesel and Diesel blended with different ratio of TPO were closely examined. In the experiment of Biodiesel, the researchers tested three different types of fuel respectively; that is, fuel (1) 100% Diesel, fuel (2) 90% diesel blended with 10% TPO, and fuel (3) 80% diesel blended with 20% TPO. Three different types of fuel with different revolutions (per minutes) and load were tested in the experiment of dynamometer. The concentration of the emission gas (major combination species gas such as CO¬2, HC, and NOX), the combustion characteristics, and the experimental data were carefully examined in order to explore the applicability of TPO as an alternative to diesel engine.
Researchers tested Three different types of fuel (as mentioned above) at engine speed 2000rpm, 1700rpm, and 1400rpm with torque load (74Nt-m) and without any load in a single cylinder four-stroke diesel engine, observing the concentration of emission gas, and followed with theoretical models and analysis of thermodynamics to calculate the relationships of temperature, pressure, and crank angle. Results indicated that fuel (3) , under the condition of 2000rpm and torque load (74Nt-m), would cause the lowest emission (i.e., CO¬2 and NOX were the lowest). Besides, the efficiency of heat release of fuel (3) were much higher than Biodiesel.
Moreover, the polluted emission of fuel (3) were found a bit lower than Biodiesel. On the other hand, under the condition of without any load, there was no significant change to the emission (CO¬2 and NOX), but the emission condition of Biodiesel would be much better than that of fuel (3) . In the experiment of Diesel, the addition of TPO could not reduce the total amount of fuel consumption. Additionally, in regard to output torque, if we blended Diesel with TPO, the torque would increase prominently, especially when the revolution was at the highest speed setting (2000rpm). However, if we blended Biodiesel and Diesel with much higher ratio of TPO (i.e. with proportion around 60% or 70%), it might cause a great damage to the diesel engine. Therefore, blending with higher proportion of TPO would be out of the scope, and we are not going to dig in depth in this study.
After comparing the experiments of the Three fuels, calculating and analyzing the data, we found that in terms of emission (air pollution), there is no difference between TPO and Biodiesel. However, results of this research project concluded that there is a possibility of utilizing TPO as an alternative to Biodiesel
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