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

Co-gasification of biosolids with biomass: Thermogravimetric analysis and pilot scale study in a bubbling fluidized bed reactor

“…6(b), the ammonia concentration also increased with increasing biosolids proportion in the fuel, passing from 1660 to 19,200 ppmv as the biosolids proportion increased from 0% to 100%. These tar content and ammonia concentration trends are consistent with literature results (Saw et al, 2011;Peng et al, 2012;Pinto et al, 2008). Again, the presented results suggest that there will be only moderate increases in tar content and ammonia concentration if the biosolids content in the feed does not exceed 25%.…”

“…However, since this study was motivated by the need for disposal of biosolids, blending of up to 25% biosolids to wood pellets did not cause significant decrease in biochar conversion and syngas yield. This is consistent with the literature where the optimal mixing ratio for co-gasification of biosolids with biomass has been reported to be 10-30% (Saw et al, 2011;Peng et al, 2012). Tar content and ammonia concentration are plotted versus biosolids proportion in Fig.…”

“…This decrease resulted from both higher ash content in the biosolids and lower char conversion in the gasification of biosolids. Several researchers (Saw et al, 2011;Peng et al, 2012) have found negative effects of increased biosolids proportion on char conversion and syngas yield. From Fig.…”

Process simulation of biomass gasification in a bubbling fluidized bed reactor

“…6 shows the effect of ER on performance parameters of gasification process (LHV, CCE, and CGE). To investigate the performance of gasification process, heating value of syngas produced (LHV), carbon conversion efficiency (CCE), and cold gas efficiency (CGE) are respectively defined as follows: The producer gas LHV in MJ/Nm 3 has been calculated only based on the individual heating value of three major energetic components, including H 2 , CO, and CH 4 [49]. Therefore, the actual LHV of the syngas should be higher than that presented here.…”

Co‐gasification of woody biomass and sewage sludge in a fixed‐bed downdraft gasifier

“…13,14 Recently, cogasification of sewage sludge with biomass has attracted much more attention. [15][16][17] This is because the sewage sludge usually has high moisture and ash contents, and low heating value, hence the gasification of pure sewage sludge results in the low energy production efficiency. Pinto et al 18 found that the addition of sewage sludge during coal gasification increases the calorific value of the producer gas and fuel conversion.…”