Scientists retrofit diesel engines to use hydrogen as fuel

As an alternative of putting hydrogen into the engine and permitting it blend very well, the scientists uncovered that its stratified addition noticeably reduces NOx emissions. This implies that the hydrogen existence is additional in selected sections of the engine when getting lesser in other elements. General, the nitrogen oxide emissions, causative of acid rain and air pollution, ended up reduced in the dual-fuel motor.

Far more importantly, not like hydrogen gasoline mobile systems, the dual gasoline technique produced by the UNSW scientists does not demand substantial-purity hydrogen to be used as gas. Due to the fact producing large-purity hydrogen is pricey, the new method could be deployed at lessen costs for the stop buyers.

An added benefit is the maximize in electrical power efficiency over current diesel engines, which the scientists documented to have improved by as substantially as 26 %. This was reached by independently managing the timings of injection of both fuels.

The analysis group is self-confident of commercializing the technologies inside of the following two yrs and plans to 1st deploy it in industrial spots these types of as mining websites in which piped hydrogen lines currently exist. Adhering to this, the staff will glance to make its know-how additional mobile, wherever a hydrogen storage process will also be essential.

The analysis findings were posted in the journal Intercontinental Journal of Hydrogen Electrical power.


Up to 90% hydrogen strength fraction was obtained in a hydrogen diesel twin-gas immediate injection (H2DDI) light-weight-obligation one-cylinder compression ignition engine. An automotive-measurement inline single-cylinder diesel motor was modified to install an supplemental hydrogen immediate injector. The engine was operated at a regular speed of 2000 revolutions for every minute and fastened combustion phasing of −10 crank angle degrees ahead of prime useless centre (°CA bTDC) though analyzing the electricity output, performance, combustion and motor-out emissions. A parametric study was carried out at an intermediate load with 20–90% hydrogen strength fraction and 180- °CA bTDC injection timing. Large indicated indicate effective strain (IMEP) of up to 943 kPa and 57.2% indicated performance was accomplished at 90% hydrogen strength fraction, at the expenditure of NOx emissions. The hydrogen injection timing directly controls the mixture problem and combustion method. Early hydrogen injection timings exhibited premixed combustion behaviour even though late injection timings manufactured mixing-managed combustion, with an intermediate issue arrived at at 40 °CA bTDC hydrogen injection timing. At 90% hydrogen power portion, the earlier injection timing potential customers to greater IMEP/effectiveness but the NOx increase is inevitable owing to increased premixed combustion. To hold the NOx improve minimal and realize the identical combustion phasing of a diesel baseline, the 40 °CA bTDC hydrogen injection timing displays the very best general performance at which 85.9% CO2 reduction and 13.3% IMEP/effectiveness improve are obtained.