Details

Autor(en) / Beteiligte

• Abubakar, Zubairu
• Shakeel, Mohammad Raghib
• Mokheimer, Esmail M.A.

Titel

Experimental and numerical analysis of non-premixed oxy-combustion of hydrogen-enriched propane in a swirl stabilized combustor

Ist Teil von

• Energy (Oxford), 2018-12, Vol.165, p.1401-1414

Ort / Verlag

Oxford: Elsevier Ltd

Erscheinungsjahr

2018

Quelle

Access via ScienceDirect (Elsevier)

Beschreibungen/Notizen

• Oxyfuel combustion is a promising carbon capture and sequestration technology. The use of CO2 diluent in oxyfuel combustion can lead to flame instability. In this study, the effect of hydrogen enrichment on the blowout limits of propane oxyfuel flames under CO2 dilution was analyzed experimentally and numerically in a swirl-stabilized, non-premixed combustor. Results show that increasing the hydrogen concentration from 0 to 30% extends the blowout limits of the CO2 diluted oxyfuel flames by 2.5%. Hydrogen enrichment, however, was found to increase CO while lowering CO2 emission as a consequence of the low residence time and competition for oxygen between the fuel species. In this regard, the minimum amount of CO2 emission recorded (74.3%) corresponds to a maximum CO emission of (1.93%) at hydrogen concentration of 40%. Increasing the gases residence time in the combustor lowers the CO emission which is desirable since beyond certain limit, CO in exhaust gases can promote the formation of pentacarbonyls that can damage CO2 transportation pipelines aimed at CCS. Decreasing the equivalence ratio from 1.0 to 0.9 also leads to a significant reduction in CO emission from 8000 ppm to <1 ppm. The flames, however, display better stability at higher equivalence ratios. •Effect of H2 enrichment on blowout limits of C3H8 with O2/CO2 oxidizer was analyzed.•2.5% increase in CO2 concentration at blowout was achieved by adding H2 from 0 to 30%.•Oxidizer Reynolds no. at blowout increased by 3500 when the H2 increased from 0 to 30%.•Adding H2 from 0 to 40% extends CO emission from 0.1 to 1.93% at the detriment of CO2.•At Φ = 1, CO emission was 8000 ppm which drops to less than 1 ppm at Φ = 0.9