Experimental Characterization of Hydrocarbons and Nitrogen Oxides Production in a Heavy-Duty Diesel–Natural Gas Reactivity-Controlled Compression Ignition Engine

Silvagni, Giacomo; Narayanan, Abhinandhan; Ravaglioli, Vittorio; Srinivasan, Kalyan Kumar; Krishnan, Sundar Rajan; Collins, Nik; Puzinauskas, Paulius; Ponti, Fabrizio

doi:10.3390/en16135164

Experimental Characterization of Hydrocarbons and Nitrogen Oxides Production in a Heavy-Duty Diesel–Natural Gas Reactivity-Controlled Compression Ignition Engine

Journal Article · Tue Jul 04 00:00:00 EDT 2023 · Energies

DOI:https://doi.org/10.3390/en16135164· OSTI ID:2424260

^[1]; Narayanan, Abhinandhan ^[2]; ^[1]; Srinivasan, Kalyan Kumar ^[2]; ^[2]; Collins, Nik ^[2]; Puzinauskas, Paulius ^[2]; ^[1]

Univ. of Bologna (Italy)
Univ. of Alabama, Tuscaloosa, AL (United States)

Reactivity-Controlled Compression Ignition (RCCI) combustion is considered one of the most promising Low-Temperature Combustion (LTC) concepts aimed at reducing greenhouse gases for the transportation and power generation sectors. Due to the spontaneous combustion of a lean, nearly homogeneous mixture of air and low-reactivity fuel (LRF), ignited through the direct injection of a small quantity of high-reactivity fuel (HRF), RCCI (dual-fuel) shows higher efficiency and lower pollutants compared to conventional diesel combustion (CDC) if run at very advanced injection timing. Even though a HRF is used, the use of advanced injection timing leads to high ignition delays, compared to CDC, and generates high cycle-to-cycle variability, limited operating range, and high pressure rise rates at high loads. This work presents an experimental analysis performed on a heavy-duty single-cylinder compression ignited engine in dual-fuel diesel–natural gas mode. The objective of the present work is to investigate and highlight the correlations between combustion behavior and pollutant emissions, especially unburned hydrocarbons (HC) and oxides of nitrogen (NOx). Based on the analysis of crank-resolved pollutants measurements performed through fast FID and fast NOx systems under different engine operating conditions, two correlations were found demonstrating a good accordance between pollutant production and combustion behavior: Net Cyclic Hydrocarbon emission—cyclic IMEP variations (R² = 0.86), and Cyclic NOx—maximum value of the Rate of Heat Released (R² = 0.82).

View Accepted Manuscript (DOE)

Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC36-08GO28308

OSTI ID:: 2424260

Journal Information:: Energies, Journal Name: Energies Journal Issue: 13 Vol. 16; ISSN 1996-1073

Publisher:: MDPICopyright Statement

Country of Publication:: United States

Language:: English

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