Effects of excess air and preheating on the flow pattern and efficiency of the radiative section of a fired heater

Effects of the position of a bluff-body on the diffusion flames: A combined experimental and numerical study

https://hal.archives-ouvertes.fr/hal-02126811/document

Oxyfuel combustion and reactants preheating to enhance turbulent flame stabilization of low calorific blast furnace gas

Flow and mixing characteristics of swirling double-concentric jets influenced by a control disc at low central jet Reynolds numbers

Experimental study on dynamics of a confined low swirl partially premixed methane-hydrogen-air flame

Bluff body stabilised non-premixed flames are usually used as pilot flames in lean-premixed combustors. Experiments are conducted to investigate the characteristics of the flame. Typical flame modes are investigated in both stable and unstable conditions. The flow structures, the reaction zone, and the dynamics of unstable flames are measured with PIV, ICCD and a high speed camera, respectively, based on which the inherent mechanisms that influence the configuration and stabilisation of the flame are analysed. Stable flames are apparently influenced by the mixing characteristics in the recirculation zone. Flame detachment, a typical phenomenon of stable flames in a turbulent air flow, can be explained by the distribution of fuel concentration in the recirculation zone. The Reynolds number of air has different effects on different parts of the flame, which results in three unstable flame modes at different Reynolds numbers of air. These results could be helpful for the design of stable burners in practice.© 2013 ASME

Characteristics of Flame Modes for a Conical Bluff Body Burner With a Central Fuel Jet

The effective utilization of low-grade energy sources generated from steel-making processes provides not only excellent opportunities for low cost power generation but also a significant means for the reduction of greenhouse gas emissions. In this paper, the work was carried out to study the static and dynamic combustion instabilities for gas turbine combustors burning low-calorific-value blast furnace gas (BFG). A burner was designed to stabilize the BFG flame with central pilot flames. A diagnostic system was set up to detect the characteristics of flame dynamics. In the experiments, the fuel ratio between the pilot and main burner and, the equivalence ratio of the main flame and the annular flow velocity were varied for the investigation of the combustion lean blowout (LBO) limits. The flame dynamics near LBO were investigated. The dynamic responses of the flame to flow perturbations were also measured. A network model was employed to study and validate the blowout mechanisms. The LBO limits were calculated and compared with experimental results for various equivalence ratios.Copyright © 2015 by ASME

Haojie Tang

Papers

Characteristics of Flame Modes for a Conical Bluff Body Burner With a Central Fuel Jet

Investigations of the Stabilities of Piloted Flames Using Blast Furnace Gas