| Biomass fuels were gasified in a bench scale atmospheric fluidized bed reactor. Fuels were gasified over a range of substoichiometric conditions to determine gas compositions and fuel conversion effects to acquire data for design applications in close-coupled boiler-gasifier systems providing boiler NOx reductions through producer gas fuel reburning.; Reported here are data and results obtained from the experiments for almond shell, walnut prunings, rice straw, whole tree wood chips, sludge, and non-recyclable waste paper. These results include bed and disengagement temperature profiles, bed differential pressures, overall mass balances, overall power balances, concentration of solids and condensibles, producer gas concentrations, gas phase ammonia, hydrogen cyanide, chloride and potassium concentrations, agglomeration tendencies, particle distributions and hot and cold gas efficiencies.; Higher heating values of producer gas ranged from 3.6 to 6.9 MJ m −3, hot gas efficiencies ranged from 26 to 55%, cold gas efficiencies ranged from 25 to 54%, gas phase ammonia concentrations ranged from 70 ppmv to 3.99% by volume dry gas basis and showed good correlation (r2 = 0.66) with fuel nitrogen content. Gas phase hydrogen cyanide ranged from 2.4 to 23.0 ppmv, potassium ranged from 2 to 61 ppmv and gas phase chlorine ranged from 9 ppmv to 810 ppmv. Closures for power balances were in the range of 55 to 92%. For fuels other than rice straw, no agglomeration of the bed was detected over the course of the tests. For rice straw, the alumina-silica bed was replaced with a largely MgO bed.; Laboratory data generated during the gasification tests were compared to predictions from a bubbling fluidized bed model, Comprehensive Simulator for Fluidized Bed Equipment (CSFB, Technologix Corporation, Chicago, I1. (de Souza-Santos, 2001)) and also compared against equilibrium gas phase concentrations computed via STANJAN (Reynolds, 1986). The model predictions from CSFB, when compared to experimental gas phase concentrations, were consistently low. STANJAN predictions were more closely aligned with experimental results but were notably higher for most gas species of interest at the same temperature.; All fuels tested are potential candidates for close-coupled boiler-gasifier systems, potentially providing boiler NOx reductions through producer gas fuel reburning. |
