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AM-95-59 ORIGIN OF NOx IN THE FCCU REGENERATOR

A. W. Peters, G. D. Weatherbee, Xinjin Zhao, Grace Davison, Columbia, MD

Format:
Electronic (digital download/no shipping)

Associate Member, International Member, Petrochemical Member, Refining Member - $0.00
Government, NonMember - $35.00

Description:

In this paper we provide a technical basis for various NOx control strategies in the FCCU. We try to answer three important questions concerning NOx formation in the regenerator. First, where does the nitrogen in the feed go? Secondly, how much if any of the NOx in the flue gas is derived from oxidation of the nitrogen in air? Finally, what can be done to reduce NOx? In answer to the first question we have nitrogen balanced an experimental pilot size FCCU for two feed stocks including a high nitrogen FCCU heavy gas oil. In both cases almost half of the nitrogen is found in the light and heavy cycle oils and the other half is found as coke on the spent catalyst. Only 10% to 25% of the nitrogen in the coke is emitted as NOx. The rest is reduced to nitrogen in the regenerator in the presence of CO and coke on the catalyst. In answer to the second question, very little of the NOx comes from the burning of air, 30 ppm or less, and probably much less. Both CO in the dense bed of the regenerator and coke on catalyst are separately effective for NOx removal. Effective strategies include any action that increases the concentration of reductant in the regenerator or more effectively uses the available reductant to reduce NO. Catalysts making use of this technology are under development.

Product Details:

Product ID: AM-95-59
Publication Year: 1995