Title: Thermal design and emissions of duct-burners for combined-cycle and cogenerative plants

Authors: Luciano A. Catalano, Andrea Dadone, Dario Manodoro, Alessandro Saponaro

Addresses: DIMEG & CEMecC, Politecnico di Bari, Via Re David 200, Bari, 70125, Italy. ' DIMEG & CEMecC, Politecnico di Bari, Via Re David 200, Bari, 70125, Italy. ' Service Business Unit – Ansaldo Caldaie, Gallarate, Varese, Italy. ' Center for Combustion and Environment – Ansaldo Caldaie, Gioia del Colle, Bari, Italy

Abstract: This paper mainly aims at demonstrating that an appropriate thermo-fluid-dynamic design optimisation of duct-burners for combined-cycle and cogenerative plants allows to satisfy restrictive emission limits, while significantly reducing the thermal stresses and the undesired pressure drops. In particular, a detailed discussion on the influence of the TEG composition and of the thermal load, measured for a standard duct-burner, is proposed to justify component failure registered in plant applications. On this basis, the paper also addresses an important design criterion, usually neglected, which allows realisation of long-life and maintenance-free duct-burners, while retaining the fundamental requirement of limiting emissions. Finally, the influence of the thermal load on the emissions produced by the modified duct-burner has been experimentally measured, and analysed, with the aid of some numerical computations.

Keywords: after-burners; thermal stress; off-design; emissions; combined cycle plants; cogeneration plants; thermal design; duct burners; design optimisation; thermoduynamics; fluid dynamics; pressure drops; environmental technology; environmental impact.

DOI: 10.1504/IJETM.2007.013243

International Journal of Environmental Technology and Management, 2007 Vol.7 No.1/2, pp.165 - 177

Published online: 13 Apr 2007 *

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