Combined NO x and NH 3 Slip Reduction in a Stoker Boiler Equipped with the Hybrid SNCR + SCR System FJBS+

Robert Wejkowski, Sylwester Kalisz, Przemysław Garbacz and Izabella Maj
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Robert Wejkowski: Department of Power Engineering and Turbomachinery, Faculty of Energy and Environmental Engineering, Silesian University of Technology, Konarskiego 18, 44-100 Gliwice, Poland
Sylwester Kalisz: Department of Power Engineering and Turbomachinery, Faculty of Energy and Environmental Engineering, Silesian University of Technology, Konarskiego 18, 44-100 Gliwice, Poland
Przemysław Garbacz: Department of Power Engineering and Turbomachinery, Faculty of Energy and Environmental Engineering, Silesian University of Technology, Konarskiego 18, 44-100 Gliwice, Poland
Izabella Maj: Department of Power Engineering and Turbomachinery, Faculty of Energy and Environmental Engineering, Silesian University of Technology, Konarskiego 18, 44-100 Gliwice, Poland

Energies, 2021, vol. 14, issue 24, 1-19

Abstract: The application of secondary NO x control methods in medium to low-capacity furnaces is a relatively new topic on the energy market and thus requires further research. In this paper, the results of full-scale research of SNCR and hybrid SNCR + SCR methods applied into a 29 MW th solid fuel fired stoker boiler is presented. The tests were performed for a full range of boiler loads, from 33% (12 MW th ) to 103% (30 MW th ) of nominal load. A novel SNCR + SCR hybrid process was demonstrated based on an enhanced in-furnace SNCR installation coupled with TiO 2 -WO 3 -V 2 O 5 catalyst, which provides extra NO x reduction and works as an excess NH 3 “catcher” as well. The performance of a brand-new catalyst was evaluated in comparison to a recovered one. The emission of NO x was reduced below 180 mg NO x /Nm 3 at 6% O 2 , with ammonia slip in flue gas below 10 mg/Nm 3 . Special attention was paid to the analysis of ammonia slip in combustion products: flue gas and fly ash. An innovative and cost-effective method of ammonia removal from fly ash was presented and tested. The main idea of this method is fly ash recirculation onto the grate. As a result, ammonia content in fly ash was reduced to a level below 6.1 mg/kg.

Keywords: selective non-catalytic reduction; selective catalytic reduction; NH 3 slip; catalyst regeneration; stoker boiler; fly ash (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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