Effect of Primary Equivalence Ratio on Reducing both Fuel-NOx and Thermal-NOx Emissions of Gas Turbine Combustor for Oxygen-blown IGCC with Hot/Dry Syngas Cleanup

概要

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In order to improve the thermal efficiency of the oxygen-blown IGCC (Integrated Gasification Combined Cycle) and to meet stricter environmental restrictions among cost-effective options, a hot/dry synthetic gas cleanup is one of the most hopeful choices. The flame temperature of medium-Btu gasified fuel used in this system is high so that NOx formation by nitrogen fixation results to increase significantly. Additionally, the gasified fuel contains fuel nitrogen, as ammonia, and it produces nitrogen oxides, the fuel NOx, in the case of employing the hot/dry synthetic gas cleanup. Low Nox combustion technology to reduce both fuel-NOx and thermal-NOx emissions has been required to protect the environment and ensure low cost operations for all kinds of oxygen-blown IGCC. In this paper, we have investigated effects of the two-stage combustion for reducing both fuel-NOx and thermal-NOx emissions, and clarified the conditions for practical application. And also we tested a combustor, examined the effects of two-staged combustion with direct injection of nitrogen produced from air separation unit, and showed the engineering guidelines for the low-NOx combustor design of oxygen-blown gasified, medium-Btu fuels.
公益社団法人日本ガスタービン学会の論文
2006-11-20