Mixing Optimization in Tubular Flow Reactor (Contributo in atti di convegno)

  • Mixing Optimization in Tubular Flow Reactor (Contributo in atti di convegno) (literal)
  • 2005-01-01T00:00:00+01:00 (literal)
Alternative label
  • *Sabia P., **Lazzaro G., *de Joannon M., *Ragucci R., **Cavaliere A., (2005)
    Mixing Optimization in Tubular Flow Reactor
    in The Italian section of the Combustion Institute, Combustion and Urban Areas, 28th Combustion Meeting, Naples, July 4-6, 2005
  • *Sabia P., **Lazzaro G., *de Joannon M., *Ragucci R., **Cavaliere A., (literal)
  • *Istituto di Ricerche sulla Combustione- CNR **Dip. Ingegneria Chimica, Università Federico II, Napoli (literal)
  • Mixing Optimization in Tubular Flow Reactor (literal)
  • 88-88104-05-4 (literal)
  • Among innovative combustion technologies, Mild Combustion represents a good trade-off between the advantage coming from the environmental benefit due to the reduction of pollutant emission and the complexity in the implementation of a new technology for energy production [1]. Although several industrial plants apply such a combustion mode, (especially in material treatment field) and several analyses, carried out on medium size plant, are present in literature, Mild Combustion potentialities are not analyzed in details because of the lack of studies that consider the fundamental aspects of the process. This is essentially due to the difficulties in setting-up test facilities on a laboratory scale that work at such extreme conditions. This work deals with the design and set-up of a laboratory scale reactor for the study of fundamental aspects of hydrocarbons and hydrocarbon/hydrogen mixture oxidation processes in Mild condition by using super-heated steam as diluent. A tubular flow reactor working in turbulent regime [2] has been chosen for the present study. The advantage of using such a configuration is twofold. First it allows for describing the oxidation process just by means of a spatial coordinate. Second the spatial resolution required for the study of the process can be obtained only by changing the flow velocity. In fact in Mild Combustion process reactions take place in a region not limited to a surface as the flame front hence the extension of the reaction zone depends on the inlet gas velocity. In the design of the reactor two main problems have been dealt with. The first concerns the need of reaching a fully developed velocity profile in order to avoid a distribution of residence times of fluid elements. The second is related to the mixing of reactants at the reactor inlet. The oxidant and diluent have to be fed separately from the fuel in order to avoid undesired reactions in the pre-heating section of the plant but they have to mix in a very short time, lower than the ignition delay of all possible mixtures that can be formed during the mixing process. In the next sections these two points have been discussed on the basis of knowledge present in literature and an optimal configuration from the fluid-dynamic point of view of the tubular flow reactor has been identified. Such a configuration has been verified by means of an experimental analysis carried on a prototype of tubular flow reactor working at room temperature. (literal)
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