Experimental Studies on Gasification of Pine Wood Shavings in a Downdraft Biomass Gasifier
نویسندگان
چکیده
Biomass is the oldest form of energy used by human beings, mainly in the form of wood. It is a renewable source of energy and has many advantages from an ecological point of view. The direct combustion of biomass generates concern among environmentalists, as it is incomplete and inconsistent and may produce organic particulate matter, carbon monoxide and other organic gases. Biomass gasification has attracted the greatest interest as it offers a higher efficiency as compared to combustion and pyrolysis. Gasification is the process of conversion of solid carbonaceous fuel into combustible gas by partial combustion. Various groups of researchers have carried out experimental studies on downdraft biomass gasifier with different biomass materials such as wood, wood chips, hazelnut shell, agricultural wastes, saw dust, etc. It is reported that bridging is a normal occurrence in the gasifier. It occurs mainly in the pyrolysis zone of the downdraft biomass gasifier. In the present study, wood shavings of pine wood are used as biomass in a downdraft biomass gasifier. To overcome bridging, the design of the biomass gasifier is modified by incorporating a shaking mechanism. With this modified design of the biomass gasifier, experiments are carried out with pine wood (Pinus roxburghii) shavings as biomass covering wide range of operating conditions. The performance of the biomass gasifier system is evaluated in terms of equivalence ratio, producer gas composition, calorific value of the producer gas, gas production rate, zone temperatures and cold gas efficiency.
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