Concentrated animal feeding operations such as dairies produce a large amount of manure, termed as dairy biomass (DB), which\r\ncould serve as renewable feedstock for thermal gasification. DB is a low-quality fuel compared to fossil fuels, and hence the product\r\ngases have lower heat content; however, the quality of gases can be improved by blending with coals. This paper deals with air-steam\r\nfixed-bed counterflow gasification of dairy biomass-Wyoming coal blend (DBWC). The effects of equivalence ratio (1.6 < F < 6.4)\r\nand steam-to-fuel ratio (0.4 < S : F < 0.8) on peak temperatures, gas composition, gross heating value of the products, and energy\r\nrecovery are presented. According to experimental results, increasing F and (S : F) ratios decreases the peak temperature and\r\nincreases the H2 and CO2 production, while CO production decreases. On the other hand, the concentrations of CH4 and C2H6\r\nwere lower compared to those of other gases and almost not affected by F.
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