Characterization of Dieseline with the Advanced Distillation Curve Method: Hydrocarbon Classification and Enthalpy of Combustion

摘要

The use of fuel blends (incorporating fluids such as natural gas or gasoline) for compression ignition engines may aid in efforts to reduce nitrogen oiides (NO_x) and particulate matter emission. The consideration and design of such blends is dependent upon the detailed properties of the particular blend. In this work, we measured blends of 10, 20, 30, 50, 70, 80, and 90% (v/v) gasoline in diesel fuel by use of the advanced distillation curve (ADC) method to determine the hydrocarbon classifications in the various volume fractions. This allows us to track the hydrocarbon families throughout the volatility profile and, most importantly, observe changes in the aromatic content of the distillate cuts. In addition, we have used the composition explicit data channel (a unique capability to sample composition throughout the distillation curve) of the ADC to access thermochemical data, and related this to the temperature data grid reported earlier. This was done by calculating a composite enthalpy of combustion based on the enthalpy of combustion of the individual components of a distillate fraction. The addition of gasoline to diesel fuel increases the amount of light paraffins in early distillate cuts and increases the amount of aromatics in later distillate cuts. Also, the addition of gasoline to diesel fuel decreases the enthalpy of combustion especially in early distillate cuts on a molar, mass, and volume basis.