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Minimalizacja emisji NOx w procesie spalania węgla

Ziaja Jolanta, Lichota Janusz

Rynek Energii

2019

Nr 2

67--74

Artykuł pokazuje porównanie osiągniętych wyników redukcji emisji tlenków azotu NOx metodami pierwotnymi i SNCR. Ograniczenia metod pierwotnych omówiono na przykładzie kotła OP-650 zmodernizowanego około 2000 r. Osiągano wówczas około 450 mg/um3. Ze względu na nowe normy UE zmniejszające dopuszczalną emisję tlenków azotu do 150 mg/um3 znaczenia nabierają metody SNCR. Pokazano wyniki obniżenia emisji tlenków azotu z kotła OE700 z wykorzystaniem mocznika. Zastosowanie testowanej technologii pozwala na spełnienie nowej normy.

The article shows a comparison of the achieved results of NOx emission reduction with primary and SNCR methods. Limitations of the primary methods are discussed on the example of the OP-650 boiler refurbished around year 2000. At that time emissions of 450 mg/m3 were achieved. Due to the new EU standards reducing the allowable emission of nitrogen oxides up to 150 mg/m3, the SNCR method becomes more important. The results of reduction of nitrogen oxides emission from the OE700 boiler with the use of urea have been shown. The application of the tested technology allows the new standard to be met.

Online monitoring system of air distribution in pulverized coal-fired boiler based on numerical modeling

Żymełka P., Nabagło D., Janda T., Madejski P.

Archives of Thermodynamics

2017

Vol. 38, no. 4

109–-125

Balanced distribution of air in coal-fired boiler is one of the most important factors in the combustion process and is strongly connected to the overall system efficiency. Reliable and continuous information about combustion airﬂow and fuel rate is essential for achieving optimal stoichiometric ratio as well as efficient and safe operation of a boiler. Imbalances in air distribution result in reduced boiler efficiency, increased gas pollutant emission and operating problems, such as corrosion, slagging or fouling. Monitoring of air ﬂow trends in boiler is an effective method for further analysis and can help to appoint important dependences and start optimization actions. Accurate real-time monitoring of the air distribution in boiler can bring economical, environmental and operational benefits. The paper presents a novel concept for online monitoring system of air distribution in coal-ﬁred boiler based on real-time numerical calculations. The proposed mathematical model allows for identification of mass ﬂow rates of secondary air to individual burners and to overﬁre air (OFA) nozzles. Numerical models of air and flue gas system were developed using software for power plant simulation. The correctness of the developed model was verified and validated with the reference measurement values. The presented numerical model for real-time monitoring of air distribution is capable of giving continuous determination of the complete air flows based on available digital communication system (DCS) data.