Economic aspects of using hydrogen in compression ignition engine operating on gas-diesel cycle

Abstract

The article gives an overview of the economic aspects of a single-cylinder internal combustion engine dual fuel operation with diesel fuel and hydrogen. The engine operating costs are calculated. Two separate cases are investigated. The first case is at constant engine speed – 1500 rpm, constant engine power (1.5 kW) and variable hydrogen mass fraction in the total fuel mass (from 0 to 50%) and the second case is at constant engine speed – (1500 and 2000 rpm), constant hydrogen mass fraction in the total fuel mass (10%) and variable engine power (1 to 4 kW). The following parameters (as a function of the corresponding variable) are determined for both cases: expenses for hydrogen and diesel fuel (in €;/hour), price of the energy obtained at the engine crankshaft (in €;/kWh), expenses for the CO2 emissions emitted by the engine (in €;/hour). The weighted average of the fuel mixture price (in €;/kg) is also determined for the first case. The calculations are made using average fuel prices in Germany for April 2019. A predominant growth in the operating costs is observed as a function of the growing hydrogen mass fraction and increasing engine power. A significant reduction in the price of CO2 emissions at constant engine power and growing hydrogen mass fraction is observed due to the lower exhaust gas toxicity.