Co-gasification of wet sewage sludge and forestry waste in situ steam agent

The co-gasification of wet sewage sludge (80 wt.% moisture, WSS) and forestry waste (FW) blends was studied. The thermogravimetric analysis showed that weight loss and the maximum weight loss rate of the sample increased with the increase in FW content. The co-gasification process was performed in a lab-scale fixed bed gasifier to investigate the effects of WSS content and reactor temperature on product yields, gas composition and gasification performance. The results indicated that steam generated from the moisture content in WSS took part in the gasification with char. The gas yield decreased with the increasing WSS content. And the concentrations of H2 and CO reached the maximum when the WSS content was 50%. The LHV of fuel gas ranged from 11.89 MJ/Nm3 to 12.72 MJ/Nm3 when the reactor temperature increased from 700 °C to 900 °C.