Article: Experience on coal reburn in a utility boiler Journal: International Journal of Environment and Pollution (IJEP) 2002 Vol.17 No.1/2 pp.31-43 Abstract: Reburning is an in-furnace combustion modification technology for the reduction of NOx. By staging the introduction of the fuel, an environment is created where NOx generated by the combustion of the main fuel supply is subsequently consumed by the hydrocarbon radicals arising from the reburn fuel under reducing conditions. ENEL has retrofitted unit No. 4 of Vado Ligure power station with coalover-coal reburn technology, with the target of 65% reduction of NOx emissions (425 mg/Nm³ of NOx @ 6% O2, with American Ashland coal). This retrofit represents the first application of the technology to a utility boiler in Europe, and it has been undertaken by a consortium of European companies, research centres and universities, as listed in the following ENEL (Italy), Mitsui Babcock Energy (United Kingdom), Ansaldo (Italy), Electricity Supply Board (Ireland), PowerGen (United Kingdom), Instituto Superior Tecnico Lisbon (Portugal), Electricidade de Portugal, Howden & Sons (United Kingdom), Electricité de France and University of Stuttgart (Germany), with the support of the European Community through the Thermie Programme. Results from the experimental campaign show that it has been possible to achieve NOx emissions in the order of 350 mg/Nm³ (@6% O2), burning a variety of coals, with carbon in ash ranging from 5 to 8%. Calculations performed on the experimental data show that the impact on boiler operation is also minimised, with a negligible change on the boiler heat transfer pattern. Inderscience Publishers - linking academia, business and industry through research

Title: Experience on coal reburn in a utility boiler

Authors: Luca Ghiribelli

Addresses: ENEL Produzione, Ricerca, Via Andrea Pisano 120, 56122 Pisa, Italy

Abstract: Reburning is an in-furnace combustion modification technology for the reduction of NO_x. By staging the introduction of the fuel, an environment is created where NO_x generated by the combustion of the main fuel supply is subsequently consumed by the hydrocarbon radicals arising from the reburn fuel under reducing conditions. ENEL has retrofitted unit No. 4 of Vado Ligure power station with coalover-coal reburn technology, with the target of 65% reduction of NO_x emissions (425 mg/Nm³ of NO_x @ 6% O₂, with American Ashland coal). This retrofit represents the first application of the technology to a utility boiler in Europe, and it has been undertaken by a consortium of European companies, research centres and universities, as listed in the following ENEL (Italy), Mitsui Babcock Energy (United Kingdom), Ansaldo (Italy), Electricity Supply Board (Ireland), PowerGen (United Kingdom), Instituto Superior Tecnico Lisbon (Portugal), Electricidade de Portugal, Howden & Sons (United Kingdom), Electricité de France and University of Stuttgart (Germany), with the support of the European Community through the Thermie Programme. Results from the experimental campaign show that it has been possible to achieve NO_x emissions in the order of 350 mg/Nm³ (@6% O₂), burning a variety of coals, with carbon in ash ranging from 5 to 8%. Calculations performed on the experimental data show that the impact on boiler operation is also minimised, with a negligible change on the boiler heat transfer pattern.

Keywords: reburn; low-NO_x systems; staged combustion.

DOI: 10.1504/IJEP.2002.000656

International Journal of Environment and Pollution, 2002 Vol.17 No.1/2, pp.31-43

Published online: 09 Jul 2003 *

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Title: Experience on coal reburn in a utility boiler

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