Врахування масообміну при визначенні критичних умов і часу займання частинки коксу вугілля
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 charac...
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| Date: | 2019 |
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| Main Authors: | , , , |
| Format: | Article |
| Language: | English Ukrainian |
| Published: |
Publishing house "Academperiodika"
2019
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| Subjects: | |
| Online Access: | https://ujp.bitp.kiev.ua/index.php/ujp/article/view/2019342 |
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| Journal Title: | Ukrainian Journal of Physics |
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Ukrainian Journal of Physics| Summary: | 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. |
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