Pyrolysis of aerobic sewage sludge, green wastes and refuse derived fuels at high temperatures in bubbling fluidized bed reactor

Effect of temperature during Flash Pyrolysis of solid wastes (Green wastes -GW-, sewage sludge -SS- and refuse-derived fuels -RDF-) in inert atmosphere was investigated in the present study. Pyrolysis was carried out in a dense fluidized bed reactor of laboratory scale (2.5 m height, 0.214 m inner diameter) where wastes are fed continuously. Experiments were conducted at temperatures between 700 and 900°C with different types of fluidized media to highlight the effect of these parameters as well as the influence of the waste nature on gas production rate and carbon distribution into pyrolysis products. For instance, the syngas produced during sewage sludge pyrolysis is rich with H2, CO, CO2, CH4 and C2HX. For SS thermal decomposition, The increase of temperature from 700 to 890°C enhances the syngas production yield from 0.22 to 0.90 Nm3/kg daf,B and reduce the tar yield from 388.55 to 131.69 g/kg of waste daf,B. According to these results, we proposed a pyrolysis diagram at different temperatures by estimating stoichiometric coefficients related to incondensable gas, char, tars, water and micropollutants. Please click Additional Files below to see the full abstract