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@BOOK{Weber:136109,
      author       = {Weber, Christian},
      title        = {{U}ntersuchungen zum {A}lkaliverhalten unter
                      {O}xycoal-{B}edingungen},
      volume       = {24},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {PreJuSER-136109},
      isbn         = {978-3-89336-551-7},
      series       = {Schriften des Forschungszentrums Jülich . Reihe Energie
                      $\&$ Umwelt / Energy $\&$ Environment},
      pages        = {VII, 143, XII S.},
      year         = {2008},
      note         = {Record converted from JUWEL: 18.07.2013},
      abstract     = {Oxycoal processes are promising power plant concepts which
                      would allow easy CO$_{2}$ removal from the exhaust products.
                      These processes are based on the combustion of coal with
                      recirculated flue gas that has been enriched in oxygen. To
                      ensure the energy efficiency the oxygen may be provided by a
                      high temperature oxygen membrane. Because of the high
                      partial pressure of CO$_{2}$ in the flue gas, the hot gas
                      chemistry and ash behaviour of the system change in
                      comparison to conventional air blown systems. The aim of the
                      present work was to examine the effects of these changes
                      concerning the condensation and stability of alkali metal
                      containing ash and slag phases. The results led to an
                      evaluation of the fouling and corrosion potential that is
                      given by these phases. Thermodynamic modelling calculations
                      have been made to characterise the alkali containing ash and
                      slag phases that condensate in the process at different
                      combustion conditions, as well as to investigate the
                      interaction between these phases and nickel base alloys of a
                      future power plant. Experimental investigations with
                      conditions of an oxycoal process demonstrated the release of
                      alkali metals, chlorine and sulphur during coal combustion,
                      the sorption of the alkali metals on solid alumosilicates,
                      the condensation of ashes and the interaction between these
                      ashes and materials of filter candles. The results of the
                      experiments complement and generally affirm the results of
                      the modelling calculations. It has been shown that the
                      stability of alkali metal containing sulphates, chlorides
                      and carbonates is depending on one hand on the oxygen
                      content of the combustion gas, on the other hand on the
                      silicon and aluminium content of the coal. According to the
                      $\lambda$-value and the used type of coal a certain risk of
                      sulphate or carbonate induced hot corrosion has to be
                      considered for metal materials, especially nickel base
                      alloys. Further on, it has been found out, that by the use
                      of coals, which are poor in silicon and aluminium, the
                      formation of alkali metal containing ashes and solid or
                      liquid slag may cause malfunction or even the destruction of
                      filter candles. Finally the investigations show that an
                      effective hot flue gas cleaning concerning the alkali metals
                      is a requirement to protect the high temperature oxygen
                      membrane from fouling and corrosion, if the membrane
                      operates at the same or slightly lower temperature as the
                      gas cleaning. Results reveal that the use of solid
                      alumosilicates as sorbent is a feasible option for this
                      purpose.},
      cin          = {IEF-2},
      ddc          = {333.7},
      cid          = {I:(DE-Juel1)VDB810},
      typ          = {PUB:(DE-HGF)3},
      url          = {https://juser.fz-juelich.de/record/136109},
}