Combustion efficiency measurements and burner characterization in a hydrogen-oxyfuel combustor

Tanneberger, Tom; Schimek, Sebastian; Paschereit, Christian Oliver; Stathopoulos, Panagiotis

doi:10.1016/j.ijhydene.2019.05.055

Cited by 24 publications

(8 citation statements)

References 28 publications

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“…14. The previous studies [30,31] showed that increased steam dilution shifts the flame upstream and in radial direction. It transitions from a jet to a swirl-stabilized flame with a larger spread angle.…”

Section: Heat Transfer Through the Wallmentioning

confidence: 95%

“…The swirled steam flow in the outer duct generates a jet that protects the reactants from the cold combustor wall to minimize its influence on the combustion efficiency. Tanneberger et al [30] already studied the flow field, mixing properties and flame shapes of this combustor. In order to give the reader a better understanding of the physics in the combustion chamber, Figure 2 presents its flow field for two levels of steam dilution Ω. Ω is defined as the ratio of the reactant mass flows to the steam mass flow used as a diluent (Eq.…”

Section: Burnermentioning

confidence: 99%

“…Secondly, a linear temperature distribution is assumed using the boundary conditions, which are the mixing temperature T mix at the inlet and the exhaust temperature T ex 60 mm downstream of the combustion chamber. In between, the adiabatic flame temperature is set at the flame position, which was determined previously [30]. The gas temperature inside the combustion chamber interpolates linearly between these values.…”

Section: Heat Transfer Through the Wallmentioning

confidence: 99%

“…The lab-scale burner in the current work builds upon an experimentally well-characterized design of a swirl-stabilized H 2 /air burner [24][25][26][27], which was equipped with additional O 2 injectors. Preliminary results were reported by Schimek et al [28] and Tanneberger et al [29][30][31], who characterized the flow and flame behavior along with the combustion efficiency. In the current paper, these investigations are extended by an analysis of the heat transfer in the combustion chamber.…”

Section: Introductionmentioning

confidence: 98%

“…The solid lines refer to the left y-axis, the dashed to the right one. In the background, contours of the OH* intensity indicate the flame shape at a similar steam dilution ratio[30].…”

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confidence: 99%

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Heat transfer measurements in a hydrogen-oxyfuel combustor

Tanneberger

Stathopoulos

2020

Experimental Heat Transfer

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In the context of emission-free electricity generation, the authors developed a novel hydrogen-oxygen combustor, which is based on swirl-stabilized combustion technology and steam dilution. Following previous burner characterization, the current study investigates the heat transfer conditions in the combustion chamber wall. To this end, a carefully controlled co-flow of air is used to cool the combustion chamber in an annular duct, which surrounds it. Temperature measurements enable the evaluation of the heat flux from the combustor flow to the walls, local wall temperatures, and the Nusselt numbers on the hot and the cold side. The extremely high wall temperatures, caused by the H2/O2 flame, can be reduced by steam dilution down to approximately 900 K. Even better cooling could be reached by using the dilution steam as the coolant before it flows to the plenum. The Nusselt numbers at the inner combustion chamber wall are in the order of 10 − 50 and increase with the thermal power and the steam dilution ratio.

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Section: Heat Transfer Through the Wallmentioning

confidence: 95%

Section: Burnermentioning

confidence: 99%

Section: Heat Transfer Through the Wallmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

“…The solid lines refer to the left y-axis, the dashed to the right one. In the background, contours of the OH* intensity indicate the flame shape at a similar steam dilution ratio[30].…”

mentioning

confidence: 99%

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