Energy and Technological Aspects of the Combustion of Ionized Gas-Dispersed Systems

• Main Authors: N. I. Poletaev, V. G. Shevchuk, M. E. Khlebnikova
• Format: Article
• Language: English
• Published: al-Farabi Kazakh National University 2016-09-01
• Series: Eurasian Chemico-Technological Journal
• Subjects: dusty flames; flame ionization; chemical kinetics; transport processes; nucleation; coalescence; gas-discharge plasma; ionizing impurities
• Online Access: http://ect-journal.kz/index.php/ectj/article/view/209
• ISSN: 1562-3920; 2522-4867

This paper discusses the flame ionization effect on the combustion processes in gaseous suspensions of the dispersed fuels. It is shown that the two-phase flame ionization affects almost all the processes of the fuel conversion – kinetics of the dispersed fuel combustion, processes of the interphase heat and mass transfer, processes of the nucleation and coagulation in the flame, formation of nanoscale products of the metal particles combustion. It is shown that the electrostatic interaction between the charged nanoparticles and ions or polar molecules in the gaseous phase leads to the appearance of molecular “pumps” that can signifi cantly change the kinetics of the heterogeneous chemical reactions and the heat exchange between particles and gas. The influence of the thermal ionization of the flame on the nucleation mechanism and rate in gas-dispersed systems is discussed. The possibility of a barrier-free homogenous and heterogeneous nucleation in the dusty flame of metallic particles is shown. The effect of electrostatic and polarizing interactions of ions and molecules on the kinetics of the ternary gas-phase reactions is considered. The influence of the monodisperse aerosol ionization degree on the kinetics of its coagulation is analyzed. It is concluded that electrostatic interaction between the particles strongly affects the inhibition of the coagulation process in gas-phase combustion products and the possibility of very fast (explosive) charged particle coagulation of monodisperse aerosols. The possibility of the targeted size of metal oxides nanoparticles control, controlled ionizing of dusty flames and the role of ion particle entrainment, the dependency of their size of the flame ionization degree are discussed. Some effects arising in complex plasma of condensed combustion products under its own electric fi elds in flames, also when the burning dust is entrained into a constant electric field and their practical applications for diagnosis are considered.