MODELING OF THE FIRE PROCESS AND EMISSION FORMATION IN THE LPG/DIESEL FUEL ENGINE

Abstract

LPG (Liquefied Petroleum Gas) is a potential alternative fuel for diesel
engines to switch to dual-fuel LPG/diesel. However, the combustion process in a
gas/diesel dual-fuel engine is very complicated due to the combination of the self-
combustion process of diesel fuel with the spreading combustion of gaseous fuel.
This paper focuses on developing thermodynamic models and combustion
reaction kinetic models to simulate the processes of mixture generation,
combustion, and emissions of dual fuel LPG/diesel engines. Then, the author used
AVL-Boost software and FORTRAN software to simulate an AVL 5402 engine
equipped with an electronically controlled accumulative fuel system (common
rail). The research results show that the selected models are suitable for engines
using dual-fuel LPG/Diesel. Average HC and NOx emissions at 9 speed levels
increased much while CO and Soot emissions decreased. In addition, when using
a higher rate of LPG, HC and NOx emissions increase.