Chapter 4. Analysis of Thermal Power Plant Ashes and their Reaction with Ceramic Filters

  1. Todd Jessen and
  2. Ersan Ustundag
  1. Laura Montanaro1,
  2. Alfredo Negro1,
  3. Olivier Frantz1,
  4. Paul Billard2 and
  5. Rouzbeh Rezakhanlou2

Published Online: 26 MAR 2008

DOI: 10.1002/9780470294628.ch4

24th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 21, Issue 3

24th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 21, Issue 3

How to Cite

Montanaro, L., Negro, A., Frantz, O., Billard, P. and Rezakhanlou, R. (2000) Analysis of Thermal Power Plant Ashes and their Reaction with Ceramic Filters, in 24th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A: Ceramic Engineering and Science Proceedings, Volume 21, Issue 3 (eds T. Jessen and E. Ustundag), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470294628.ch4

Author Information

  1. 1

    Dept. Materials Science and Chemical Engineering, Politecnico, Corso Duca degli Abruzzi, 24, 10129 Torino, Italy

  2. 2

    EDF, Electricitw de France, Centre des Renardieres, BP 1, Ecuelles, 77250 Moret-sur-Loing, France

Publication History

  1. Published Online: 26 MAR 2008
  2. Published Print: 1 JAN 2000

ISBN Information

Print ISBN: 9780470375686

Online ISBN: 9780470294628

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Keywords:

  • advanced hot gas filter;
  • gas filtration systems;
  • thermal stress;
  • fiber ceramic composites;
  • corrosion

Summary

Three ceramic candle filters, two made of SiC added with a clay-based binder, one made of alumina and mullite, and three different thermal power plant ashes were investigated. The glassy phase amount in both filters and ashes was extrapolated by the etching-dissolution curves and the chemical composition was evaluated by atomic emission spectroscopy. For studying any possible chemical interaction between the filter materials and the ashes, two tests were performed. Small cubes of the ashes were placed on the surface of filter samples and the contact areas were analysed by scanning electron microscopy and energy dispersive spectroscopy, after heat treatment at 1000° and 1100°C. For identifying any new crystalline phases, 1:1 by weight mixtures of each ash and powdered filter were uniaxially pressed, treated at the above temperatures and then analysed by X-ray diffraction. During heat treatment weight losses were measured and imputed to a reaction between crystalline phases in the pure ashes, yielding SO3 evolution. Few interaction phenomena were evidenced: sticking of the ashes to the filter surface due to the low softening temperature and etching on the clay-based binder phase present in one of the SiC filters, but independently by the contact with ash particles.