Category Archives: Thermal biomass. conversion and utilization —. Biomass information. system

Fast pyrolysis gas and solid by-products

The gas is of low to medium heating value, 5-15 MJ/Nm3, depending on the method of pyrolysis. Even after efficient vapour condensation and liquid collection, it still has a relatively high oil content and either needs to be burned hot such as for drying feedstock, or a tertiary clean-up stage may be needed according to how it is used. Physical […]

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Global Kinetic Models

The kinetics of wood degradation and its respective components have been and still are obtained by measuring the rate of weight loss of the sample as a function of time and temperature. The most common technique for this investigation is thermogravimetric analysis (TGA). TGA involves continuous weighing and recording of data obtained from a sample, heated at either constant temperature […]

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Europe

Europe has only relatively recently become involved in direct production of liquid fuels from biomass. Up to 1989, a conventional (slow) pyrolysis demonstration plant of 500 kg/h was operated by Alten in Italy for liquid and char production with approximately 25% yield of each (4). The product was derived in relatively low yields from an undefined reaction system. It is […]

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CATALYTIC EFFECTS IN PYROLYSIS

Most biomass contains natural salts that will influence the decomposition products. However, since the salts cannot readily be removed without affecting the organic substrate, any catalytic effects become part of the simple thermal degradation process. Much of the early work on fundamentals such as Shafizadeh (11) recognised the effect but did not take advantage of the phenomena. A particular example […]

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