High-temperature oxygen gasification of sludge

Based on Aspen Plus, a computer simulation model for sludge gasification was developed. The influences of moisture content in sludge, gasification pressure and equivalence ratio(ER) were considered. The results showed that, the producer gas were mainly CO, H₂, CO₂ and H₂O with little H₂S, CH₄, while SO₂ and N₂ were almost none; with the increase in sludge moisture content, ER should be increased in order to maintain the temperature at 1273 K; with the increase in ER, CO and H₂ decreased which led to the decrease of the calorific value of the producer gas; With the increase in gasification pressure, H₂S and CH₄ increased while CO and H₂ decreased. The calorific value slightly increased with the increase in gasification pressure.