Dairy Biomass-Wyoming Coal Blends Fixed Gasification Using Air-Steam for Partial Oxidation

摘要

Concentrated animal feeding operations such as dairies produce a large amount of manure, termed as dairy biomass (DB), which could serve as renewable feedstock for thermal gasification. DB is a low-quality fuel compared to fossil fuels, and hence the product gases have lower heat content; however, the quality of gases can be improved by blending with coals. This paper deals with air-steam fixed-bed counterflow gasification of dairy biomass-Wyoming coal blend (DBWC). The effects of equivalence ratio (1.6＜Φ＜6.4) and steam-to-fuel ratio (0.4＜S∶F＜0.8) on peak temperatures, gas composition, gross heating value of the products, and energy recovery are presented. According to experimental results, increasing Φ and (S ∶ F) ratios decreases the peak temperature and increases the H_2 and CO_2 production, while CO production decreases. On the other hand, the concentrations of CH_4 and C_2H_6 were lower compared to those of other gases and almost not affected by Φ.