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Tar characterisation in new generation agro-residue gasifiers - Cyclone and downdraft open top twin air entry systems

Jayamurthy, M and Dasappa, S and Paul, PJ and Sridhar, G and Sridhar, HV and Mukunda, HS and Rajan, NKS and Brage, C and Liliedahl, T and Sjostrom, K (1997) Tar characterisation in new generation agro-residue gasifiers - Cyclone and downdraft open top twin air entry systems. In: Conference on Gasification Networks/Pyrolysis Network, APR 09-11, 1997, Stuttgart, Germany.

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This paper deals with the characterisation of tar from two configurations of bioresidue thermochemical conversion reactors designed for producer gas based power generation systems. The pulverised fuel reactor is a cyclone system (R1) and the solid bioresidue reactor (denoted R2) is an open top twin air entry system both at 75-90 kg/h capacity (to generate electricity similar to 100 kVA). The reactor, R2, has undergone rigorous test in a major Indo-Swiss programme for the tar quantity at various conditions. The former is a recent technology development. Tars collected from these systems by a standard tar collection apparatus at the laboratory at Indian Institute of Science have been analysed at the Royal Institute of Technology (KTH), Sweden. The results of these analyses show that these thermochemical conversion reactors behave differently from the earlier reactors reported in literature in so far as tar generation is concerned. The extent of tar in hot gas is about 700-800 ppm for R1 and 70-100 ppm for R2. The amounts of the major compounds - naphthalene and phenol-are much lower that what is generally understood to happen in the gasifiers in Europe. It is suggested that the longer residence times at high temperatures allowed for in these reactors is responsible for this behavior. It is concluded the new generation reactor concepts extensively tried out at lower power levels hold promise for high power atmospheric gasification systems for woody as well as pulverisable bioresidues.

Item Type: Conference Paper
Publisher: CPL Press
Additional Information: Copyright of this article belongs to CPL Press.
Department/Centre: Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Date Deposited: 12 Apr 2012 08:02
Last Modified: 12 Apr 2012 08:02
URI: http://eprints.iisc.ac.in/id/eprint/43881

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