Numerical simulation of nitrogen oxide formation in dust furnaces

Keywords: Coal particles, Burner, Nitrogen oxides, Atomic nitrogen, Molecular nitrogen

Abstract

Even though natural sources of air pollution account for over 50 % of sulphur compounds, 93 % of nitrogen oxide which are the most dangerous artificial anthropogenic sources of air pollution and primarily associated with the combustion of fossil fuel. Coal-fired thermal power plants and industrial fuel-burning plants that emit large quantities of nitrogen oxides (NО and NО2), solids (ash, dust, soot), as well as carbon oxides, aldehydes, organic acids into the atmosphere pollute the environment in majority. In the present work, a mathematical model and a scheme for calculating the formation of nitrogen oxide has been developed. Also, the dependence of the rate of release of fuel nitrogen from coal particles at the initial stage of gasification and content of volatiles has been obtained. The main regularities of the formation of NOx at the initial section of the flame in the ignition zone of the swirl burner flame during the combustion of Ekibastuz coal have been revealed. Modern environmental requirements for the modernization of existing and the creation of new heat and power facilities determine the exceptional relevance of the development of effective methods and constructions to reduce emissions of nitrogen oxides, sulfur oxides and ash to 200, 300, and 100 mg/nm3 at a=1.4. The dust consumption in all experiments was kept constant and amounted to 0.042 g/s, as well as with the results of calculating the thermal decomposition of the Ekibastuz coal dust, the recombination of atomic nitrogen into nitrogen molecules, and the kinetics of the formation of fuel nitric oxide.

It was found that despite the presence of oxygen in Ekibastuz coal for gases Odaf=11.8 % in an inert atmosphere, nitrogen oxides are not formed

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Author Biographies

Bulbul Ongar, Academy of Logistics and Transport; Al-Farabi Kazakh National University

Department of Power Engineering

Department of Thermal Physics and Technical Physics

Hristo Beloev, University of Ruse

Department of Thermotechnics, Hydraulics and Environmental Engineering

Iliya Iliev, University of Ruse

Department of Thermotechnics, Hydraulics and Environmental Engineering

Assem Ibrasheva, Satbayev University

Department of Automation and Control

Anara Yegzekova, Academy of Logistics and Transport

Department of Power Engineering

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Published
2022-01-10
How to Cite
Ongar, B., Beloev, H., Iliev, I., Ibrasheva, A., & Yegzekova, A. (2022). Numerical simulation of nitrogen oxide formation in dust furnaces. EUREKA: Physics and Engineering, (1), 23-33. https://doi.org/10.21303/2461-4262.2022.002102
Section
Energy