CIESC Journal ›› 2014, Vol. 65 ›› Issue (7): 2426-2436.doi: 10.3969/j.issn.0438-1157.2014.07.004

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A novel multi-layer and multi-zone redox FCC regenerator design for removing NOx gas system

LI Jun, LUO Guohua, WEI Fei   

  1. Beijing Key Laboratory of Clean Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
  • Received:2014-04-23 Revised:2014-05-07 Online:2014-07-05
  • Supported by:

    supported by the National Natural Science Foundation for Young Scientists of China (21006056) and the Sinopec Engineering Incorporation Commission Program (20092001139).

Abstract: The development of NOx reduction strategy, the fluid catalytic cracking (FCC) regeneration process and the formation and conversion of NOx are summarized. O2 is a strong inhibiter of the reaction of NO reduction by CO. It should be an efficient NOx reduction way by controlling O2 concentration of the regenerator. A new type of a multi-layer multi-zone with oxidation zone and reduction zone NOx reduction technology is proposed. This new regeneration process could have characteristics of low carbon content, short regeneration time, high burning intensity, and counter-current contact with catalyst and air. In view of NOx reduction, regeneration temperature should be less than 700℃, CO concentration in regenerator no less than 4% and O2 concentration in regenerator less than 1% at least. This novel FCC regenerator technology is a highly efficient and economical NOx reduction technology, which has been demonstrated in the FCC plant of PetroChina Dagang Petrochemical Company, and might be applied to other FCC process or coal combustion for NOx reduction.

Key words: fluid catalytic cracking, catalyst, regeneration, NOx reduction, multi-layer and multi-zone redox, carbon monoxide

CLC Number: 

  • TE992.1
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