Effects of Multiple-Injection-Burner Configurations on Combustion Characteristics for Dry Low-NOx Combustion of Hydrogen-Rich Fuels

Abstract

The successful combination of coal-based integrated gasification combined cycle (IGCC) technology with carbon dioxide (CO2) capture and storage (CCS) requires gas turbines that can achieve dry low-NOx combustion of hydrogen-rich syngas with a wide range of hydrogen concentrations for lower emissions and higher plant efficiency. The authors have been developing a “multiple-injection burner” to achieve dry low-NOx combustion of such hydrogen-rich fuels. The purpose of this paper is to experimentally investigate the combustion characteristics of a multiple-injection burner with a convex perforated plate in order to determine its effectiveness in suppressing combustion oscillation. The experiments were conducted at atmospheric pressure. Three kinds of fuel with hydrogen concentrations ranging from 40 to 84% were tested. The temperature of the combustion gas at the burner exit was 1775 K. The experimental results show that the convex burner was effective in suppressing combustion oscillation: it achieved stable low-NOx emissions of less than 10 ppm for all the test fuels. These findings demonstrate that the convex burner can achieve stable low-NOx combustion of hydrogen-rich fuels with a wide range of hydrogen concentrations by suppressing combustion oscillation.