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INFLUENCE OF SNCR PROCESS ON THE DYNAMICS OF THE COMBUSTION AND ON THE CONTENT OF UNBURNED CARBON IN THE BOTTOM ASH

Mihai Cruceru

Abstract

Selective non-catalytic reduction of nitrogen (SNCR) oxides is a conventional technology applied extensively to conventional fuel combustion equipment in order to mitigate the emission of such oxides. The results of the process ? NOx concentration in the exhaust gas evacuated and the influence of the SNCR process on the overall combustion process depend on several factors and must be examined in each particular case. The paper presents a comparison between the situation before and after application of the SNCR process at a 1035 t/h coal-fired boiler (Rovinari thermal power plant, Romania). SNCR is a cost-effective solution compared to Selective Catalytic Reduction (SCR) reaching reduction efficiency up to 90% from that of SCR process. Although the SNCR process reduces successfully, the NOx emissions it was found that several parameters of the combustion process were altered as a result of SNCR process. The most important effect was a significant increase of the unburned carbon in the bottom ash, which suggests that SNCR influences negatively the quality of the combustion process in the boiler furnace. Another important finding was the variability of nitrogen reduction rate depending on the momentary quality of the coal and boiler load.

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