Numerical research on the SNCR method in a grate boiler equipped with the innovative FJBS system

Garbacz, Przemysław; Wejkowski, Robert

doi:10.1016/j.energy.2020.118240

Cited by 11 publications

(1 citation statement)

References 19 publications

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“…At the same time, the injection of 40% urea water solution is realized to meet the objectives of selective non-catalytic reduction. The combustion chamber is equipped with jet blowers (Figure 1) whose location was determined based on temperature measurements, numerical calculations [50] and previous experience [51]. The number of jet blowers and their arrangement on the boiler walls can vary depending on the boiler specification.…”

Section: Methodsmentioning

confidence: 99%

Combined NOx and NH3 Slip Reduction in a Stoker Boiler Equipped with the Hybrid SNCR + SCR System FJBS+

et al. 2021

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The application of secondary NOx 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 MWth solid fuel fired stoker boiler is presented. The tests were performed for a full range of boiler loads, from 33% (12 MWth) to 103% (30 MWth) of nominal load. A novel SNCR + SCR hybrid process was demonstrated based on an enhanced in-furnace SNCR installation coupled with TiO2-WO3-V2O5 catalyst, which provides extra NOx reduction and works as an excess NH3 “catcher” as well. The performance of a brand-new catalyst was evaluated in comparison to a recovered one. The emission of NOx was reduced below 180 mg NOx/Nm3 at 6% O2, with ammonia slip in flue gas below 10 mg/Nm3. 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.

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Section: Methodsmentioning

confidence: 99%