NOx control for coal-fired plant, CCC/157

Author(s): Hermine Nalbandian-Sugden

Ref: CCC/157
ISBN: 978-92-9029-477-1
Published Date: 01/10/2009
No. of Tables: 7
No. of Figures: 29
No. of Pages: 51


Increasingly stringent national and international legislation for limiting NOx emissions has been adopted in many countries. NOx formation mechanisms, including when cofiring biomass, in coal-fired power plant is discussed in the review. Cofiring biomass and other opportunity fuels with coal in utility power stations is considered a means of reducing emissions not only of NOx but also of SO2 and CO2. Cofiring is a recent trend which is expected to increase throughout the world. Primary measures or combustion modifications are the first method used to control NOx emissions. These have been used since the early 1970s. They generally achieve 30–70% reduction and include process optimisation, low NOx burners (LNBs), air staging (overfire air (OFA)) and fuel staging (reburning). Flue gas treatment technologies, first installed in the early 1980s, are used to meet more stringent NOx emission limits, usually in combination with combustion measures. Those include selective catalytic reduction (SCR), selective non-catalytic reduction (SNCR) as well as multi-pollutant control systems. There have been many developments in both primary measures and flue gas treatment technologies over the decades. Low emission boiler systems which include advances in firing configuration, advanced LNBs and flue gas recirculation aim to improve on existing primary measures. Improved SCR catalyst management, enhanced SNCR, hybrid SNCR/SCR systems and new multi-pollutant control processes are some of the latest developments in flue gas treatment. This report updates past reviews on NOx control technology for coal combustion, published by IEA Clean Coal Centre. The effects of cofiring on plant operation, performance, emissions and NOx control system are presented.

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