Impact of Biomass Blends on the Behaviour of the Reduction Zone in a Downdraft Gasifier
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Biomass gasification through thermochemical conversion principle has emerged as a promising technology to fulfil the need of decentralized heat and power applications. Since quality and quantity of the various biomasses available in remote areas are not the same, proper study on the behaviour of gasifier with biomass blends is needed for the possible use of various bio-energy resources in a region. In a biomass gasifier, the reduction zone plays a vital role in the conversion of biomass to combustible gases. Hence, in this paper a two zone kinetic equilibrium model approach is used for predicting the composition and temperature of producer gas along the length of reduction zone of a 50 kW downdraft gasifier. The influence of equivalence ratio and composition of biomass blends on the temperature, species concentration and quality of producer gas are studied from analytical and experimental methods. The study shows that the combination of biomass blends influences the performance of the reduction zone. It is also observed that the reaction rate is high in the reduction zone when the equivalence ratio is increased above 0.3; however the maximum combustible gas composition is obtained when the equivalence ratio is close to 0.2
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