Integration of capacitors with carbon - lignin based electrodes in rail vehicles for enhanced energy efficiency

Abstract

The article presents considerations regarding the possibility of recovering braking energy of a rail vehicle. The energy parameters obtained during acceleration and braking of the loaded bus were taken as input data. It was found that over 13 kWh of energy was lost irretrievably in the braking resistors. Due to the speed of the discussed process, capacitors with an original design were proposed for energy recovery. For the purposes of this study, electrodes were fabricated using carbon derived from lignin carbonization at two distinct temperatures: 900°C and 1000°C. Based on the electrochemical tests carried out, it was found that the second proposed solution achieves a significantly better power-to-weight ratio – 13 kW/kg.

Simulation analysis of a gas engine with various prechamber neck diameters in lean burning condition

“…Hydrogen as a fuel for rail transportation is being considered and implemented in terms of fuel cells or combustion in reciprocating engines [4,10]. Subsequently, hybrid propulsion systems, often equipped with a CI engine and various energy recovery and storage systems, are being developed [6,15]. An existing solution also powers powertrains with natural gas, stored in liquefied (LNG) or compressed (CNG) form [2,7].…”