Performance of Multiple Injection Dry Low NOx Combustors on Hydrogen Rich Syngas Fuel in an IGCC Pilot Plant

Abstract

The successful development of coalbased integrated gasification combined cycle (IGCC) technology requires gas turbines capable of achieving the dry low nitrogen oxides (NOx) combustion of hydrogenrich syngas fuels for low emissions and high plant efficiency. Mitsubishi Hitachi Power Systems, Ltd. (MHPS) has been developing a “multipleinjection burnerâ€‌ to achieve the dry lowNOx (DLN) combustion of hydrogenrich syngas fuels. The purposes of this paper are to present the test results of a multican combustor equipped with multipleinjection burners in an IGCC pilot plant, and evaluate combustor performance by focusing on the effects of flame shapes. The syngas fuel produced in the plant contained approximately 50% carbon monoxide, 20% hydrogen, and 20% nitrogen by volume. In the tests, the combustor with slenderer flames achieved lower NOx emissions of 10.9 ppm (at 15% oxygen), reduced combustor liner and burner plate metal temperatures, and lowered combustion efficiency at the maximum gas turbine load. The test results showed that the slenderer flames were more effective in reducing NOx emissions and liner/burner plate metal temperatures. A comparison with the diffusionflame combustor demonstrated that the multipleinjection combustors achieved the dry lowNOx combustion of the syngas fuel in the plant.