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

Nerijus Striūgas, Rolandas Paulauskas, Raminta Skvorčinskienė and Aurimas Lisauskas
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Nerijus Striūgas: Laboratory of Combustion Processes, Lithuanian Energy Institute, Breslaujos str. 3, LT-44403 Kaunas, Lithuania
Rolandas Paulauskas: Laboratory of Combustion Processes, Lithuanian Energy Institute, Breslaujos str. 3, LT-44403 Kaunas, Lithuania
Raminta Skvorčinskienė: Laboratory of Combustion Processes, Lithuanian Energy Institute, Breslaujos str. 3, LT-44403 Kaunas, Lithuania
Aurimas Lisauskas: Laboratory of Combustion Processes, Lithuanian Energy Institute, Breslaujos str. 3, LT-44403 Kaunas, Lithuania

Energies, 2020, vol. 13, issue 18, 1-16

Abstract: 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 CH 4 in CO 2 under air, O 2 -enriched atmosphere, or with the addition of hydrogen. The tested burner ensured stable combustion of waste biogases with CH 4 content not less than 20 vol%. The addition of up to 5 vol% of H 2 expanded flammability limits, and stable combustion of the mixtures with CH 4 content of 15 vol% was achieved. The burner flexibility to work under O 2 -enriched air conditions showed more promising results, and the flammability limit was expanded up to 5 vol% of CH 4 in CO 2 . However, the combustion under O 2 -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* (I OH* /I CH* ) and CH 4 content in CO 2 was presented, which predicts blow-off limits burning waste biogases under different H 2 or O 2 enrichments.

Keywords: swirl burner; waste biogas; hydrogen; oxygen; combustion; flame stability; blow-off limit (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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