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Emissions of nitrogen oxides from coal combustion are a major environmental problem because they have been shown to contribute to the formation of acid rain and photochemical smog. Air staging and the application of low-NO x burners are effective in reducing the in-furnace-formed NO x . Fuel staging, or reburning, is another effective method to reduce NO x emissions in the...
This report describes the nitrogen distribution in coal pyrolysis at different temperatures and oxygen partial pressures to allow discussion of the influence of different gas components on the DeNOx capability of the pyrolysis gases and tar species. Test runs with nitrogen-free reburn fuels and with coal pyrolysis gas showed that the nitrogen concentration, especially in the tar components of the...
Investigations on air staging and fuel staging were carried out with an electrically heated tube reactor. The effects of stoichiometry and residence time in the fuel-rich zone and the effects of temperature were evaluated for air staging with different coals and, in the case of reburning, for different gaseous reburn fuels. The results show the strong influence of residence time and stoichiometry,...
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