A dual fuel ICE diesel-H2 featuring 1,600 bar cryogenic liquid H2 injection

Dual fuel internal combustion engines (ICEs) using diesel and fuels that are vaporous in normal conditions are collecting consideration for two motives. First is the occasion to achieve diesel-like power density phi and fuel conversion efficiency eta steady-state, and similar transient performances. Second, is the chance to deliver better than diesel engine out emissions, for CO2, particulate matter, unburned hydrocarbons, and nitrous oxides. A high-pressure (HP) cryogenic liquid injector is proposed for H-2 and applied to a high compression ratio high boost ICE featuring 2 direct injections (DI) injectors per cylinder, 1 diesel, and 1H(2). Super-turbocharging (mechanically assisted turbocharging) is employed to make better steady-state performances, especially low-speed high-load, but also highspeed high-load, and transients, principally eliminating the turbo-lag. This work aims at evaluating the benefits of further increasing the injection pressure of the cryogenic hydrogen in a specific dual fuel diesel-hydrogen engine setting. With the proposed 1600 bar injector, this ICE delivers top eta>52%, and higher eta>40% over most of the speed-load range, with the option to further increase phi vs. the baseline diesel working less lean at top loads and adopting mixed premixed-diffusion combustion modes. (c) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Automated summary

Dual fuel internal combustion engines utilizing diesel and hydrogen aim to achieve diesel-like power density and fuel conversion efficiency, while improving emissions performance. By using a high-pressure hydrogen injector and super-turbocharging technology, higher efficiency and performance can be achieved.