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Considerations for Ultra-Low NOx Operation in Combined Cycle Plant Retrofits

[+] Author Affiliations
Dani Fadda, Mark Buzanowski

Peerless Mfg. Co., Dallas, TX

Tom Reis

Chevron, McKittrick, CA

Paper No. POWER2006-88109, pp. 699-704; 6 pages
doi:10.1115/POWER2006-88109
From:
  • ASME 2006 Power Conference
  • ASME 2006 Power Conference
  • Atlanta, Georgia, USA, May 2–4, 2006
  • Conference Sponsors: Power Division
  • ISBN: 0-7918-4205-3 | eISBN: 0-7918-3776-9
  • Copyright © 2006 by ASME

abstract

High efficiency selective catalytic reduction (SCR) systems are designed as retrofits for heat recovery steam generators (HRSG) to comply with increasingly more stringent environmental standards. The retrofits are designed for continuous combined cycle plant operation with ultra low NOx emissions. These retrofits require special design considerations. Maldistribution (non uniformity) in the velocity profile within a high efficiency SCR system is one consideration which is the focal point of this paper. With a specified velocity profile (having a slight maldistribution), high and low efficiency retrofits are compared. It is demonstrated that, while the slight maldistribution in the velocity profile may significantly impact the performance of a high efficiency retrofit, it may be unnoticeable for a low efficiency retrofit.

Copyright © 2006 by ASME

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