Ehsan Houshfar - Experimental Investigation on Corrosion Abatement in Straw Combustion by Fuel Mixing

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  Publication Details (including relevant citation   information):

  Energy Fuels, 2011, 25 (6), pp 2687–2695

  DOI: 10.1021/ef200232r

  Publication Date (Web): May 12, 2011

  Copyright © 2011 American Chemical Society


  In an attempt to minimize corrosion in biomass-fired boilers,   combustion experiments were performed using binary mixtures of   straw with peat, sewage sludge, or grot (branches and treetops).   The mixing ratios were carefully selected using literature and   thermodynamic calculations. All mixtures were pelletized. The   combustion experiments were performed in a laboratory-scale   multi-fuel reactor. Extensive analytical analysis of the system   included the gas concentration and particle size distribution in   the flue gas, the elemental composition of the fuel, and the   bottom ash and specific particle size fractions of fly ash. This   allowed for the determination of the fate of the main corrosive   compounds, in particular, chlorine. The corrosion risk associated   with the three fuel mixtures was quite different. Grot was found   to be a poor corrosion-reduction additive because of its marginal   influence on the chlorine share in aerosols. Grot could not serve   as an alternative fuel for co-firing with straw either because no   dilution effect on the particle load was measured. Peat was found   to reduce the corrosive compounds only at high peat additions (50   wt %). Sewage sludge was the best alternative for corrosion   reduction because 10 wt % addition almost eliminated chlorine   from the fly ash.

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