[NOx and SO2 formation in the sintering process and influence of sintering material composition on NOx emissions].

NOx and SO2 formation in the sintering process and the influence of coke powder content, moisture content and adding additives on NO emissions were investigated by the sintering pot experimental method. The results showed that the combustion zone moved downward along the sintering pot after the sintering started. The NOx concentrations of all monitoring points below the combustion zone were basically the same. SO2 generated in the combustion zone was adsorbed and accumulated in the sintering materials below the zone. Then, SO2 was released by pyrolysis, and finally discharged from the outlet of sintering pot. So the significant SO2 couldn't be detected before the burning through point, and the relationship between the SO2 concentration and the sintering time displayed an inverted "V" curve. NOx produced from the sintering process was mainly thermal-NOx, and most of it was NO, the NO2 concentration was very low. Reducing the coke powder and moisture contents, or adding sintering additives could effectively reduce NOx emissions.