Chemiluminescence-based characterization of tail biogas combustion stability under syngas and oxygen-enriched conditions

Striūgas, Nerijus; Zakarauskas, Kęstutis; Paulauskas, Rolandas; Skvorčinskienė, Raminta

doi:10.1016/j.expthermflusci.2020.110133

Cited by 14 publications

(7 citation statements)

References 39 publications

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“…As can be seen from Figure 3, the stable combustion of the waste biogas (LCV) with CH 4 ≥ 25 vol% in CO 2 can be reached in the air under all tested range of φ. Compared to previous results [27], the combustion of waste biogas in a flat flame burner under the air atmosphere was only able with a mixture of 30 vol% CH 4 in CO 2 . In that case, the developed burner shows wider flammability ranges under air conditions.…”

Section: Stability Maps Of Waste Biogas (Lcv) Combustioncontrasting

confidence: 87%

“…Further increase in O 2 content from 25 to 30 vol% also led to increased OH* emission intensities and the chamber temperatures. A similar trend of OH* emission intensity increase, due to a higher O 2 content in the oxidizer was also determined in previous works [27,39]. According to He et al [18], the OH* formation reaction (7) dominates under oxygen-enriched conditions as the intensity of reaction ( 7) is enhanced when the concentration of O 2 in the oxidizer increases and vice versa.…”

Section: Changes In Flame Chemiluminescencesupporting

confidence: 84%

“…This could be related to low content of H 2 addition, as it might not be sufficient to represent the flame enhancement via flame chemiluminescence. The previous research showed similar results with the same level of H 2 addition, and the significant combustion improvement and higher intensities of OH* and CH* were achieved only at higher levels of H 2 addition [27].…”

Section: Changes In Flame Chemiluminescencesupporting

confidence: 72%

“…Though, the increase of hydrogen addition to 5 vol% led to higher OH* emission intensities by~1.6 times and a higher chamber temperature at point T 1 bỹ 30 • C burning LCV gas mixtures with CH 4 content of 25 vol% and 20 vol%. According to previous work [27], the increased OH* intensities and chamber temperatures could be attributed to an improved flame stability. However, the waste biogas (LCV) flammability limit using the H 2 enrichment was achieved burning mixtures with CH 4 content of 15 vol%, and a further decrease in CH 4 content led to the flame blow-off.…”

Section: Changes In Flame Chemiluminescencementioning

confidence: 51%

“…Taking into account that biogas production rates are increasing and to prevent waste biogas emissions to the atmosphere, these gases should be utilized safely on-site. The previous work [27] showed that the addition of up to 20 vol% hydrogen or oxygen-enriched air ensures stable combustion of waste biogases (CH 4 > 30% in CO 2 ) with low emissions in a flat flame burner. Based on these findings, a flexible swirl burner (~100 kW) with an adiabatic chamber capable of burning unstable composition waste biogases was designed and developed.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of Waste Biogas Flame Stability Under Oxygen or Hydrogen-Enriched Conditions

Striūgas¹,

Paulauskas²,

Skvorčinskienė³

et al. 2020

Energies

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Increasing production rates of the biomethane lead to increased generation of waste biogases. These gases should be utilized on-site to avoid pollutant emissions to the atmosphere. This study presents a flexible swirl burner (~100 kW) with an adiabatic chamber capable of burning unstable composition waste biogases. The main combustion parameters and chemiluminescence emission spectrums were examined by burning waste biogases containing from 5 to 30 vol% of CH4 in CO2 under air, O2-enriched atmosphere, or with the addition of hydrogen. The tested burner ensured stable combustion of waste biogases with CH4 content not less than 20 vol%. The addition of up to 5 vol% of H2 expanded flammability limits, and stable combustion of the mixtures with CH4 content of 15 vol% was achieved. The burner flexibility to work under O2-enriched air conditions showed more promising results, and the flammability limit was expanded up to 5 vol% of CH4 in CO2. However, the combustion under O2-enriched conditions led to increased NOx emissions (up to 1100 ppm). Besides, based on chemiluminescence emission spectrums, a linear correlation between the spectral intensity ratio of OH* and CH* (IOH*/ICH*) and CH4 content in CO2 was presented, which predicts blow-off limits burning waste biogases under different H2 or O2 enrichments.

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Section: Stability Maps Of Waste Biogas (Lcv) Combustioncontrasting

confidence: 87%