ABSTRACT
Utilization of hydrocarbon gaseous fuels, such as biogas, landfill gas and others, is a valuable contribution to sustainable energy production and climate changing control. The presence of CO2 in these gases decreases heat of combustion, flame temperature, flame speed and can induce flame blow-off and combustion instabilities. In order to better understand the problem, flame geometry and location was investigated using CH* chemiluminescence imaging technique. Combustion took place in a purposely built, lean, premixed, unconfined swirl burner, fueled by methane and propane diluted with CO2. The fuel type, air-to-fuel equivalence ratio and CO2 content were chosen as the independent variables. The CH* imaging by means of a commercial CCD camera, fitted with an optical filter, was used for flame investigation. The analysis of images showed that the CH* emission intensity, flame geometry and location were remarkably affected by the fuel type and the air-to-fuel equivalence ratio, while the CO2 dilution was of minor importance.
KEYWORDS
PAPER SUBMITTED: 2018-03-12
PAPER REVISED: 2019-09-03
PAPER ACCEPTED: 2019-09-26
PUBLISHED ONLINE: 2019-10-06
THERMAL SCIENCE YEAR
2019, VOLUME
23, ISSUE
Supplement 5, PAGES [S1511 - S1521]
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