Online Emissions from a Vibrating Roller Using an Ethanol-Diesel Blend during a Railway Construction

摘要

The present work has been focused on the measurement and analysis of diesel emissions produced by a construction machinery (vibrating roller) fuelled with conventional fuel and an ethanol-diesel blend under the typical operations in railways construction. A commercial pure diesel fuel and a blend with 7.7% v/v of anhydrous ethanol (99.7%) were used as test fuels. The vibrating roller was equipped with a system HORIBA OBS 1300. The OBS system includes sensors for measurement of gaseous emissions, air-fuel ratio, exhaust gas flow, exhaust temperature and pressure, global positioning system (GPS), and inertial sensor. The last two sensors were used to determine the position and the velocity of the machine. Ambient conditions (temperature, pressure, and humidity) were measured using a sensor also coupled to the OBS system. A smoke meter Wager 6500 was used to measure the smoke opacity, and this signal was also registered by the OBS system. The properties of the test fuels and the time-recording of all the machine parameters were used for the analysis and interpretation of the results. The studied operation sequences were named: engine start on (S), idle operation (I), circulation (C), and work (W). The obtained results suggest that the use of the e-diesel blend is an interesting alternative for a significant reduction in smoke opacity during transient engine operation, the latter being a usual condition in this type of vehicles.