Abstract:

Based on the SO₂ absorption-emission mechanism， a model for computing flue gas SO₂ concentration distribution during sintering was established. After the comparison of the computional results and the in-site data from a 360m² sinter machine in China， the model was validated. Then， the factors influencing on the flue gas distribution were investigated， including the sinter-bed height， speed， carbon content and moisture content. The results indicate that the flue gas SO₂ distributes as a Cubic curve along the sinter machine length. The peak value of the SO₂ concentration arrives earlier with higher carbon content and lower sinter-bed height， slower speed and lower moisture content， and the first three ones affect the flue gas SO₂ concentration more. The SO₂ concentration from the top to one-third of the sinter machine in the length direction is less 200mg/m³， when the sinter-bed height， sinter-bed speed and the moisture and carbon content is， 650~700mm， 2.3m/min， 7%and 3%，respectively.

Key words: flue gas, SO₂ concentration, influencing factor, sintering process, SO₂ distribution