Abstract

The investigations on air staging and fuel staging were carried out at a 0.5 MW pulverized coal combustion chamber and an electrically heated tube reactor. In air-deficient conditions, given by air staging and fuel staging, the NOx emissions decreased with inreasing temperature. In pulverized bituminous coal combustion, reburning is superior to air staging. Whereas minimum NOx emissions of about 250 mg/Nm3 could be achieved with air staging, reburning brought about values around 200 mg/Nm3. The results obtained at the test facilities show the same tendency of dependence on the impact parameters and the same level of NOx emissions as the one attained at industrial-scale utilities.

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