Experimental Investigation of Double-Swirled Non-premixed Syngas Flames by Planar Laser-Induced Fluorescence

Abstract

Experimental measurements are carried out on a non-premixed model combustor, equipped with a double-swirled syngas burner. Mixtures of H 2 , CO, and CO 2 with appropriate contents are used to simulate corresponding syngas used in a practical gas turbine combustor. Planar laser-induced fluorescence (PLIF) of OH radical measurement is adopted to identify main reaction zones and burnt gas regions as well. Together with the temperature and emission measurements during the exhaust section, some important characteristics of the syngas flame are investigated overall. In this paper, the effects of the N 2 dilution and CO/H 2 molar ratio consisting of syngas fuel are investigated. Experimental results show that the syngas flame root near the burner exit demonstrates a double flame front structure. The increase of the CO/H 2 ratio alters the shape and position of the flame root and compresses the main reaction zone. The existence of N 2 diluents, however, changes the whole flame root structure and merges into a single flame root. The CO emission can be controlled to a desirable level for the case of a high CO/H 2 ratio if the flow field is well-organized.

OH-Planar Laser-Induced Fluorescence Measurements in Laminar Diffusion Flames of n-Heptane with Coflow Air Diluted by N2 and CO2

“… In comparison with the N 2 and H 2 O diluents, CO 2 dilution has a better effect in reducing the flame temperature. Ge et al measured the flame characteristics of the H 2 /CO/CO 2 non-premixed flame using OH-PLIF and discussed the flame structure changes with N 2 dilution. It was found that the structure of the double flame front appears at the root of the non-premixed syngas flame, and the change in the CO/H 2 ratio enabled the position of the flame root to move and compress the thickness of the reaction zone.…”

Temperature and emissions characteristics of a micro-mixing injection hydrogen-rich syngas flame diluted with N2

“…The syngas of the gas turbine for this technology mainly consists of H 2 , CO and a small amount of CH 4 , etc. [3]. Although the heat value of syngas is lower than that of natural gas, its combustion equilibrium temperature is higher due to its hydrogen-rich characteristics.…”

Reduction of Emissions from a Syngas Flame Using Micromixing and Dilution with CO2

“…Integrated gasification combined cycle (IGCC) technology combined with carbon capture and storage (CCS) technology is a very competitive approach for use in clean coal technology . The syngas of the gas turbine fuel for this technology mainly consists of H 2 , CO, and a small amount of CO 2 , CH 4 , and N 2 . Syngas gas turbine technology must overcome two challenges: one is combustion safety, and the other is combustion pollution control.…”

“…1 The syngas of the gas turbine fuel for this technology mainly consists of H 2 , CO, and a small amount of CO 2 , CH 4 , and N 2 . 2 Syngas gas turbine technology must overcome two challenges: one is combustion safety, and the other is combustion pollution control. For security considerations, to prevent the problems of autoignition and flashback, a diffusion flame is used for IGCC syngas gas turbine combustion.…”