Now more than ever there is a growing global interest to reduce green house gas (GHG) emissions originating from internal combustion engines. One approach consists in the use of hydrogen instead of carbon-containing fuels. Large bore gas engines for power generation are often fueled by gases with high methane content. Relative to natural gas-fueled engines, the power densities of premixed or port-fuel-injected hydrogen engines are limited due to low volumetric efficiencies and moreover by occurring irregular combustion events (knocking, backfire).

The paper presents results from experimental investigations of the impact of different hydrogen substitution rates in natural gas on performance, emissions and operating limits on a single cylinder research engine. The engine is representative for a large bore gas engine for power generation and operates using an open chamber combustion concept with lean mixtures.

Essentially, HC, CO~2~, and CO emissions decrease with rising hydrogen content of the fuel gas. It has been shown that overproportional reductions in HC emissions are feasible even with low hydrogen admixtures. Usually NO~X~ emissions will rise with unchanged operating parameters. However, if excess-air ratio and spark timing are adjusted, a net reduction of NO~X~ emissions can be achieved while maintaining brake thermal efficiency.

Furthermore, the paper outlines potential mitigation strategies to expand the operational limits with respect to power density with high hydrogen substitution rates.


Assessment of Hydrogen and Natural Gas Mixtures in a Large Bore Gas Engine for Power Generation

Division / Sponsors: 
Internal Combustion Engine Division (ICED)

Paper Proceedings: https://asmedigitalcollection.asme.org/ICEF/ICEF2020/volume/84034

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