Mercury capture by powdered activated carbon in a fluidized bed reactor (Contributo in atti di convegno)

Type
Label
  • Mercury capture by powdered activated carbon in a fluidized bed reactor (Contributo in atti di convegno) (literal)
Anno
  • 2006-01-01T00:00:00+01:00 (literal)
Alternative label
  • Scala F., Chirone R., Lancia A. (2006)
    Mercury capture by powdered activated carbon in a fluidized bed reactor
    in Proc. of 10th Int. Conf. Multiphase Flow in Industrial Plant, Tropea (VV), Italy
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Scala F., Chirone R., Lancia A. (literal)
Pagina inizio
  • 49 (literal)
Pagina fine
  • 57 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Istituto di Ricerche sulla Combustione - CNR Dipartimento di Ingegneria Chimica - Università degli Studi di Napoli Federico II (literal)
Titolo
  • Mercury capture by powdered activated carbon in a fluidized bed reactor (literal)
Abstract
  • Removal of mercury vapor from combustion/incineration flue gas is typically accomplished with the use of activated carbon as an adsorbent. This technique requires both a large gas-solid interface area and a significant contact time between the phases. The most economically attractive contact design is the direct in-duct pneumatic injection of powdered activated carbon, with the subsequent collection in a particulate matter control device. However, this design provides a very low contact time between the flue gas and the adsorbent in the ductwork, of the order of few seconds. In the present work a bubbling fluidized bed of inert material was used as a filter to increase both the residence time and the specific gas-solid contact surface of the activated carbon. Mercury capture experiments have been conducted at 100°C in a purposely designed lab-scale pyrex reactor, that could be operated both in the fluidized bed and in the entrained bed mode. Commercial powdered activated carbon was pneumatically injected in the reactor and mercury concentration at the outlet was monitored continuously. Experimental results showed that the presence of a bubbling fluidized bed led to an increase of the mercury capture efficiency and, in turn, of the activated carbon utilization. Transient mercury concentration profiles at the bed outlet during the runs were used to discriminate between the controlling phenomena in the process. Experimental data have been analyzed in the light of a phenomenological framework that takes into account the presence of both free and adhered carbon in the reactor as well as mercury saturation of the adsorbent. (literal)
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