Abstract
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 prospective choices. The flame temperature of medium-Btu gasified fuel used in this system is relatively high, so that NOx formation by nitrogen fixation increases significantly. Additionally, the gasified fuel contains fuel nitrogen in the form of ammonia mostly 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 demonstrated effectiveness of two-stage combustion and nitrogen injection technique, and also showed useful engineering guidelines for the low-NOx combustor design of oxygen-blown gasified, medium-Btu fuels.
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