4.7 Article

The importance of SO2 and SO3 for sulphation of gaseous KCl - An experimental investigation in a biomass fired CFB boiler

Journal

COMBUSTION AND FLAME
Volume 157, Issue 9, Pages 1649-1657

Publisher

ELSEVIER SCIENCE INC
DOI: 10.1016/j.combustflame.2010.05.012

Keywords

Sulphation; KCl; Alkali chlorides; Fluidised bed combustion; Combustion of biomass; In situ Alkali Chloride Monitor (IACM)

Funding

  1. Varmeforsk AB [A5-509, 997]
  2. Swedish Energy Administration
  3. Solvie Herstad Svard and Marianne Gyllenhammar
  4. Britt-Marie Steenari (Chalmers University of Technology, CTH)
  5. Technical Research Institute of Sweden
  6. Vattenfall's Thermal Technology Programme

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This paper is based on results obtained during co-combustion of wood pellets and straw in a 12 MW circulating fluidised bed (CFB) boiler. Elemental sulphur (S) and ammonium sulphate ((NH4)(2)SO4) were used as additives to convert the alkali chlorides (mainly KCl) to less corrosive alkali sulphates. Their performance was then evaluated using several measurement tools including, IACM (on-line measurements of gaseous alkali chlorides), a low-pressure impactor (particle size distribution and chemical composition of extracted fly ash particles), and deposit probes (chemical composition in deposits collected). The importance of the presence of either SO2 or SO3 for gas phase sulphation of KCl is also discussed. Ammonium sulphate performed significantly better than elemental sulphur. A more efficient sulphation of gaseous KCl was achieved with (NH4)(2)SO4 even when the S/Cl molar ratio was less than half compared to sulphur. Thus the presence of gaseous SO3 is of greater importance than that of SO2 for the sulphation of gaseous KCl. (C) 2010 The Combustion Institute. Published by Elsevier Inc. All rights reserved.

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