TY - JOUR N2 - Power boilers should be characterized by high flexibility in terms of loads, which results from the demand for electricity. In addition to the flexibility of the boiler, it is also important for the boiler to operate under technical minimum conditions while maintaining harmful emissions standards. A boiler operating with a technical minimum should also exhibit a stable combustion process. The paper presents the results of numerical combustion research for the minimum load of the two-pass ultrasupercritical boiler with front wall swirl burners system. The combustion stability for the minimum boiler load of 40% for the three mill system configurations has been demonstrated. Based on the numerical tests carried out in terms of obtaining the most favourable combustion conditions and the emission of harmful substances, the most favourable of them cases was indicated. L1 - http://www.journals.pan.pl/Content/118777/PDF/art04.pdf L2 - http://www.journals.pan.pl/Content/118777 PY - 2020 IS - No 4 EP - 114 DO - 10.24425/ather.2020.135855 KW - numerical simulations KW - Ultra-supercritical boiler KW - coal combustion KW - Minimum boiler load A1 - Hernik, Bartłomiej A1 - Zabłocki, Wiesław PB - The Committee of Thermodynamics and Combustion of the Polish Academy of Sciences and The Institute of Fluid-Flow Machinery Polish Academy of Sciences VL - vol. 41 DA - 2020.12.30 T1 - Numerical research of combustion with a minimum boiler load SP - 93 UR - http://www.journals.pan.pl/dlibra/publication/edition/118777 T2 - Archives of Thermodynamics ER -