Abstract
The semi-dried sewage sludge was combusted in a 1MW CFB furnace. The emission characteristics of CO, NO and N <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> O at different temperatures and excess air ratios were studied. The heavy metals distribution was also investigated. With 30% moisture content, the net heating value of sewage sludge is sufficient for auto-thermal combustion without supplementary fuel. The CO concentration in flue gas was reduced by 70% with excess air ratio rising from 1.18 to 1.75. The NO and N <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> O concentrations in flue gas were 255 mg/m and 89 mg/m with excess air ratio of 1.75 at 800 °C which can meet the emission standard of MSW incineration in China. The heavy metals content in fly ash was low enough for use in alkaline soil.
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