Suggested Citation:
Kornbluth, Kurt L., Jason Greenwood, Zach McCaffrey, David R. Vernon, Paul A. Erickson (2010) Extension of the Lean Limit through Hydrogen Enrichment of a LFG-Fueled Spark-Ignition Engine and Emissions Reduction. International Journal of Hydrogen Energy 35 (3), 1412 - 1419

In this experimental investigation the affect of hydrogen addition to a landï¬ll gas-fueled naturally-aspirated spark-ignition engine was explored. Hydrogen concentrations of 0%, 30%, 40%, and 50% by volume were added to simulated landï¬ll gas (60% CH4 and 40% CO2). Efï¬ciency, coefï¬cient of variance of indicated mean effective pressure, and CO emissions were measured from near stoichiometric mixtures up to the lean operating limit. Engineout NOx emissions were compared to predicted future best available control technology targets for NOx emissions in landï¬ll gas-to-energy projects. From this study, it was determined that with 40% hydrogen by volume untreated exhaust NOx emissions can meet the 0.22 g/kWh NOx target while retaining 95% of baseline power and low CO emission.

Keywords: hydrogen enrichment, bi-fueling, emissions, spark ignition, lean operating limit, landï¬ll gas