Dynamics and Control of Forced-Unsteady-State Catalytic Combustors

  • A. A. Barresi
  • M. Vanni


The dynamic behaviour of the reverse flow reactor and of the network of combustors, with periodic variation of the feed position, has been investigated: the destruction of lean waste gas emissions has been considered. In the reverse flow reactor larger emissions occur at each feed switch, caused by wash out; in addition, temporary decrease of conversion can occur during start up. This is not the case for the network of combustors, which also assures a more uniform exploitation of the catalyst.

A two-point feedback controller has been tested for the network, because an open loop periodic control is not sufficiently robust for this application: the range of values that makes autothermal operation possible in the network is very narrow. The performance of a feedback control in the case of the reverse flow has also been investigated.


Reverse Flow Cycle Period Inlet Concentration Outlet Concentration Lean Mixture 


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  1. 1.
    Eigenberger G. (1992) Fixed-bed reactors, in: Ullmann’s Encyclopedia of Chemical Industry, Vol. B4. VCH, Weinheim, 199–238Google Scholar
  2. 2.
    Matros Y.H. (1996) Forced unsteady-state processes in heterogeneous catalytic reactors. Canad. J. Chem. Eng. 74: 566–579CrossRefGoogle Scholar
  3. 3.
    Brinkmann M., Barresi A.A., Vanni M., Baldi G. (1999) Unsteady state treatment of very lean waste gases in a network of catalytic burners. Cat al. Today 47: 263–277CrossRefGoogle Scholar
  4. 4.
    Barresi A.A., Vanni M., Brinkmann M., Baldi G. (1997) Nonstationary catalytic destruction of lean waste gases in a network of burners and a reverse- flow reactor under nonadiabatic conditions. In: Proc. 1st European Congress on Chemical Engineering, ECCE1, Florence, Italy, 4–7 May 1997: 587–590Google Scholar
  5. 5.
    Cittadini M., Vanni M., Barresi A.A., Baldi G. (2001) Transient behaviour and start-up of periodical flow reversal reactors for catalytic decontamination of waste gases. Chem. Eng. Process., submittedGoogle Scholar
  6. 6.
    van de Beld L. (1995) Air purification by catalytic oxidation in an adiabatic packed bed reactor with periodic flow reversal. Ph.D. Dissertation, University of Twente, EnschedeGoogle Scholar
  7. 7.
    Barresi A.A., Vanni M., Brinkmann M., Baldi G. (1999) Influence of the wall heat losses on the performance of a network of nonstationary catalytic burners. Chem. Eng. Technol. 22: 237–239CrossRefGoogle Scholar
  8. 8.
    Cittadini M., Vanni M., Barresi A.A., Baldi G. (1999) Efficient design and scale up of reverse flow catalytic combustors. AIDIC Conf. Ser. 4: 131–138Google Scholar
  9. 9.
    Cittadini M., Vanni M., Barresi A.A., Baldi G. (2001) Simplified procedure for design of catalytic combustors with periodical flow reversal. Chem. Eng. Process. 40: 255–262CrossRefGoogle Scholar
  10. 10.
    Khinast J., Luss D. (1997) Mapping regions with different bifurcation diagrams of a reverse-flow reactor. A.I.Ch.E. J. 43: 2034–2047CrossRefGoogle Scholar
  11. 11.
    van de Beld L., Westerterp K.R. (1997) Operation of catalytic reverse flow reactor for the purification of air contaminated with volatile organic compounds. Canad. J. Chem. Eng. 75: 975–983CrossRefGoogle Scholar
  12. 12.
    Cittadini M., Vanni M., Barresi A.A., Baldi G. (2000) Development and design of a forced unsteady-state reactor through numerical simulation, in: Pierucci S. (Ed.) European Symposium on Computer Aided Process Engineering-10; Computer-Aided Chemical Engineering, Vol. 8. Elsevier, Amsterdam: 697–702Google Scholar
  13. 13.
    Cittadini M., Vanni M., Barresi A.A., Baldi G. (2001) Reverse-flow catalytic burners: response to periodical variation in the feed. Chem. Eng. Sci. 56: 1443–1449CrossRefGoogle Scholar
  14. 14.
    Barresi A.A., Vanni M., Brinkmann M., Baldi G. (1999) Control of an autothermal network of nonstationary catalytic reactors. A.I.Ch.E. J. 45: 1597–1602CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Italia, Milan 2002

Authors and Affiliations

  • A. A. Barresi
    • 1
  • M. Vanni
    • 1
  1. 1.Dip. Scienza dei Materiali e Ingegneria ChimicaPolitecnico di TorinoTorinoItaly

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