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Abstract-Pyrolysis and gasification of biomass is considered to be the promising alternative solutions for the increase of energy demand and environmental awareness. Pyroysis process produces a variety of chemicals by limited degradation and gasification process leads to complete breakdown of the biomass into permanent gases. By gasification, solid biomass is converted into a combustible gas mixture normally called "Producer Gas" consisting primarily of hydrogen and carbon monoxide, with lesser amounts of carbon dioxide, water, methane, higher hydrocarbons, nitrogen and particulates. Whereas the pyrolysis process produces a mainly three types of products: solid (charcoal), liquid (tar and other organics) and gaseous products. In the present study, Jatropha de-oiled cake is taken as a biomass. The pyrolysis and gasification experiments are carried out for comparing the results. The biomass is pyrolyzed in a fixed bed reactor in a Nitrogen environment as well used to produce the producer gas in a fixed bed downdraft biomass gasifier.

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Fluidized bed combustor is one out of the most popular techniques to utilize biomass wastes in agricultural states like Punjab, India. In this work, a three‐phase mathematical model, considering bubble growth along bed height, has been developed. The mathematical model has been used to find out certain key performance parameters like carbon utilization efficiency, bed carbon load and exit gas composition in a bubbling fluidized bed combustor using tuyre‐type distributor plate. The model predictions have been compared with 7.5 MW fluidized bed power plant using cotton stalk and are found to be in good agreement with plant data. © 2015 Curtin University of Technology and John Wiley & Sons, Ltd.

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