ENEL and Ansaldo Experience in Designing, Installing and Operating Reburn Systems in large oil-fired boilers

摘要

The Italian Electricity Company (ENEL S.p.A.) has conducted, together with Ansaldo Energia, a comprehensive modification program within its generating park, in order to comply with me new air quality standards for fossil fuel-fired power stations. The two companies have developed and implemented innovative technologies for "in-furnace" NO{sub}x control, which have been applied both in Italy and abroad, on boilers of any kind and for different fuels: oil, gas and coal. Among all the combustion modification technologies, reburning has proven to be so effective that, inmost cases (oil and gas-fired units), it permits to reach NO{sub}x values lower than 200 mg/Nm{sup}3 (existing legislation limit) avoiding the installation of SCR. This paper outlines the technical knowledge available for the design of reburn systems for retrofit application and describes the main results obtained when this technology was applied in 320 and 660 MWe oil-fired units.