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This project investigates the impact of the application of advanced NOX reduction technologies, such as deep furnace staging, on practical operating issues for coal-fired power plant. Programmes of laboratory-, pilot and full-scale tests have been undertaken and numerical simulation models have been extended to predict the effects of fuel selection and the firing of coal and coal/biomass blends when applying staging and overfire air conditions. Carbon in ash levels have been predicted for full scale plant and an existing carbon in ash notification (CARNO) system was extended to incorporate overfire air applications. Deposition assessments were carried out at pilot- and laboratory-scale using modelling studies to define test conditions and identify locations where slagging and fouling could be a problem under staged conditions. Furnace corrosion and metal loss rates were identified for different fuel compositions and staging conditions. Corrosion probes installed in a full scale plant were used to monitor local corrosion problems. The findings from these work programmes were used to develop a series of guidelines that will advise operators on operational factors to be considered when using advanced NOX reduction technologies. Factors identified include advice on fuel selection, coal blends and co-firing coal with biomass, particle milling requirements, particle residence times needed in different zones, optimum furnace stoichiometry and injection velocities, risk areas for and operational measures to combat slagging, measures for minimising problem corrosion conditions (including tube material selection) and ways of minimising cost penalties resulting from SRC catalyst deactivation when co-firing biomass.

Additional information

Authors: WHITEHOUSE M, RWE npower, Windmill Hill Business Park, Wiltshire (UK);RILEY G, RWE npower, Windmill Hill Business Park, Wiltshire (UK);WIRTZ S, Ruhr Universität Bochum, Bochum (DE);LOHR S, Ruhr Universität Bochum, Bochum (DE);VERHOEFF F, Energy Research Centre of the Netherlands, Le Petten (NL);CIEPLIK M, Energy Research Centre of the Netherlands, Le Petten (NL);COSTA M, Instituto Superior Técnico, Lisboa (PT);AZEVEDO T, Instituto Superior Técnico, Lisboa (PT);WITKAMP J, KEMA Nederland, Arnhem (NL);DE JONG M, KEMA Nederland, Arnhem (NL);GIBBS B, University of Leeds, Leeds (UK);NIMMO B, University of Leeds, Leeds (UK)
Bibliographic Reference: EUR 23861 EN (2009), 125 pp. Euro: 20
Availability: (Catalogue Number: KI-NA-23861-EN-S)
ISBN: ISBN: 978-92-79-11321-5
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