Numerical Studies of the Influence of Flue Gas Recirculation into Primary Air on NO x Formation, CO Emission, and Low-NO x Waterwall Corrosion in the OP 650 Boiler

Bartłomiej Hernik (), Piotr Brudziana, Radosław Klon and Marek Pronobis
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Bartłomiej Hernik: Department of Power Engineering and Turbomachinery, Silesian University of Technology, Konarskiego 18, 44-100 Gliwice, Poland
Piotr Brudziana: RAFAKO Innovation, ul. Łąkowa 33, 47-400 Racibórz, Poland
Radosław Klon: RAFAKO Innovation, ul. Łąkowa 33, 47-400 Racibórz, Poland
Marek Pronobis: Department of Power Engineering and Turbomachinery, Silesian University of Technology, Konarskiego 18, 44-100 Gliwice, Poland

Energies, 2024, vol. 17, issue 9, 1-25

Abstract: Numerical calculations of the innovative flue gas recirculation (FGR) system through an inactive coal pulverizer for a 40% load of the OP 650 boiler at the Jaworzno III Power Plant were carried out. The research was conducted to determine the effect of FGR on the formation of NO x , CO emissions, and low-NO x waterwall corrosion. Using numerical modelling, the influence of the place of injection of recirculated flue gas on the formation of NO x was also investigated. The tests were carried out based on data from the boiler monitoring system and calculation results using a 0-dimensional model. Modelling of the FGR was performed for five variants. FGR equalized the temperature in the furnace, eliminating temperature peaks in the burner belt. Moreover, FGR did not increase the CO content in the flue gas and reduced the O 2 concentration in the area zone of pulverized coal combustion. For FGR systems, the emission of NO x below 200 mg/m 3 n for 6% O 2 in dry flue gas was kept. This proves that the recirculation helps to meet the BAT (best available techniques) requirements for NO x emissions. It has also been shown that FGR does not pose a risk of low-NO x corrosion in the next 20 years.

Keywords: flue gas recirculation; combustion; numerical simulations; NO x emission (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: 2024
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