Co-gasification of blended coal with feedlot and chicken litter biomass
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Fixed-bed gasification was described as a technology for utilizing animal waste as a source of renewable energy, which can reduce its disposal problems and associated pollution issues. Fixed-bed co-gasification studies on coal and animal waste-based fuels, e.g., feedlot biomass (cattle manure) and chicken litter biomass, were studied experimentally under batch mode operation. The average oxidation-front and gasification-front propagation velocity, spatial temperature profiles, and product gas composition were measured for coal and the blended fuels at two different airflow rates; 1.48, and 1.97 kg/hr (1.28 and 1.70 cu m/hr), and two different fuel particle sizes; 9.4 and 5.15 mm. The average oxidation-front propagation velocity was primarily dependent on the airflow rate and ash content of the gasified fuel. Using phenomenological analysis, the average oxidation-front propagation velocity was correlated with a dimensionless group involving the fuel properties and airflow rate through the gasifier. The molar typical composition of the product gas was 27-30% CO, 7-10% H2, 1-3% CH4, 2-6% CO2, and 51-63% N2 (dry basis), which was almost insensitive to the fuel particle size and airflow rate. The heating value of the product gas mixture varied between 4.5-5.12 MJ/kg (dry basis).
