Influence of Mass Transfer on the Critical Conditions and the Time of the Coke Particle Ignition
Keywords:particle, coke, ignition time, mass transfer, critical conditions
The time evolution of the temperature in a coke particle during its ignition in a heated gas has been analyzed in order to analytically determine the induction period with regard for the mass transfer of oxygen to the particle surface. It is shown that the ignition process can be divided into characteristic stages. But the inflection points in the time dependence of the particle temperature do not coincide with the stage boundaries and, hence, cannot be used for their identification. When determining the end of the heating stage analytically, it is better to associate it with a temperature that is lower than the inflection temperature by one characteristic interval. When considering the further heating of the particle during the chemical reaction, the mass transfer has to be taken into account. A new method for the analytical determination of the ignition time is proposed, which makes allowance for chemical reactions and the mass transfer that simultaneously run in the transition and diffusion combustion regions.
A. Becker, M. Schiemann, S. Heuer, N. Vorobiev, V. Scherer, D. Haxter et al. A standardized method for the characterization of coal ignition under oxyfuel conditions. In Proceedings of the 32nd Pittsburgh Coal Conference (2015), p. 1.
V.V. Pomerantsev. Fundamentals of the Practical Theory of Combustion (Energoatomizdat, 1986) (in Russian).
V.I. Babii, Yu.F. Kuvaev. Combustion of Coal Dust and Calculation of Pulverized Coal Torch (Energoatomizdat, 1986) (in Russian).
V.V. Kalinchak, A.S. Chernenko. Thermophysics of Pulverized Coal Burning (Odessa Nat. Univ., 2017) (in Russian).
V.V. Kalinchak, S.G. Orlovskaya, L.I. Ryabchuk, O.N. Zui. Influence of the temperature field nonuniformity in carbon particles on their ignition and combustion. Modern Sci.: Research., Ideas, Results, Techn. No. 2 (4), 98 (2010).
B.V. Alekseev, A.M. Grishin. Physical Gas Dynamics of Reacting Media (Vysshaya Shkola, 1985) (in Russian).
D.A. Frank-Kamenetskii. Diffusion and Heat Transfer in Chemical Kinetics (Springer, 1995).
B.V. Kantorovich. Introduction to the Theory of Combustion and Gasification of Solid Fuel (Metallurgiya, 1960) (in Russian).
I.A. Yavorskii. Quantum-chemical concepts of the reaction mechanism of carbon materials with gases. Kinet. Goren. Iskop. Topliv No. 2, 5 (1978) (in Russian).
V.V. Kalinchak, A.S. Chernenko, M.N. Korchagina. Influence of gas mixture parameters on the maximum temperature and combustion rate of carbon particle. Fiz. Aerodisp. Syst. No. 53, 105 (2016) (in Russian).
V.V. Kalinchak, A.S. Chernenko, Yu.A. Zinchenko. Ignition, combustion, and quenching of carbon particles at parallel-sequential formation of carbon oxides. Metal Lit'e Ukr. No. 10, 21 (2013) (in Russian).
V.V. Kalinchak. High-Temperature Heat and Mass Exchange, Critical Phenomena at Phase and Chemical Transitions in Dispersed Systems. Dr. Sci. thesis (Odessa State University, 1996) (in Russian).
V.V. Kalinchak, A.S. Chernenko, M.V. Sikorskyi, A.N. Sofronkov, A.V. Fedorenko. Cool air-gas mixtures with combustible gas admixtures steady flameless combustion delay time on platinum particle (wire). Phys. Chem. Sol. State 19, 53 (2018). https://doi.org/10.15330/pcss.19.1.53-59
How to Cite
License to Publish the Paper
The corresponding author and the co-authors (hereon referred to as the Author(s)) of the paper being submitted to the Ukrainian Journal of Physics (hereon referred to as the Paper) from one side and the Bogolyubov Institute for Theoretical Physics, National Academy of Sciences of Ukraine, represented by its Director (hereon referred to as the Publisher) from the other side have come to the following Agreement:
1. Subject of the Agreement.
The Author(s) grant(s) the Publisher the free non-exclusive right to use the Paper (of scientific, technical, or any other content) according to the terms and conditions defined by this Agreement.
2. The ways of using the Paper.
2.1. The Author(s) grant(s) the Publisher the right to use the Paper as follows.
2.1.1. To publish the Paper in the Ukrainian Journal of Physics (hereon referred to as the Journal) in original language and translated into English (the copy of the Paper approved by the Author(s) and the Publisher and accepted for publication is a constitutive part of this License Agreement).
2.1.2. To edit, adapt, and correct the Paper by approval of the Author(s).
2.1.3. To translate the Paper in the case when the Paper is written in a language different from that adopted in the Journal.
2.2. If the Author(s) has(ve) an intent to use the Paper in any other way, e.g., to publish the translated version of the Paper (except for the case defined by Section 2.1.3 of this Agreement), to post the full Paper or any its part on the web, to publish the Paper in any other editions, to include the Paper or any its part in other collections, anthologies, encyclopaedias, etc., the Author(s) should get a written permission from the Publisher.
3. License territory.
The Author(s) grant(s) the Publisher the right to use the Paper as regulated by sections 2.1.1–2.1.3 of this Agreement on the territory of Ukraine and to distribute the Paper as indispensable part of the Journal on the territory of Ukraine and other countries by means of subscription, sales, and free transfer to a third party.
4.1. This Agreement is valid starting from the date of signature and acts for the entire period of the existence of the Journal.
5.1. The Author(s) warrant(s) the Publisher that:
– he/she is the true author (co-author) of the Paper;
– copyright on the Paper was not transferred to any other party;
– the Paper has never been published before and will not be published in any other media before it is published by the Publisher (see also section 2.2);
– the Author(s) do(es) not violate any intellectual property right of other parties. If the Paper includes some materials of other parties, except for citations whose length is regulated by the scientific, informational, or critical character of the Paper, the use of such materials is in compliance with the regulations of the international law and the law of Ukraine.
6. Requisites and signatures of the Parties.
Publisher: Bogolyubov Institute for Theoretical Physics, National Academy of Sciences of Ukraine.
Address: Ukraine, Kyiv, Metrolohichna Str. 14-b.
Author: Electronic signature on behalf and with endorsement of all co-authors.