Идентификация параметров модели термического разложения горючих сланцев
| Parent link: | Химическая физика и мезоскопия: научное издание.— , 2000- Т. 19, № 3.— 2017.— [С. 371-378] |
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| Резюме: | Заглавие с экрана Предложена математическая модель кинетики разложения горючих сланцев при их нагреве. Сланец представляется твердым пористым каркасом, разлагающимся при нагреве с образованием твердых и газообразных продуктов. Модель включает две параллельных реакции и учитывает явление межфазного массообмена. Осуществлено сравнение результатов численного моделирования с данными экспериментов. Oil shale is an organic-rich fine-grained sedimentary rock. Heating processes convert the organic matter containing the oil shale into solid and fluent (gas and liquid) products. Some of resulting products can be used as fuel or for the stuff in the chemical industry. To study these processes the mathematical modeling is necessary. The reduced kinetical model of oil shale thermal decomposition under electromagnetic field was suggested in this paper. Total mathematical model of oil shale thermal decomposition should take into account heterogeneity of temperature fields and concentrations, the flow of the gaseous decomposition products in pores, concentration expansion phenomenon, thermal effects of chemical reactions. The shale is represented by a solid, porous structure that decomposes under the heating into solid and gaseous products. The kinetical model includes two parallel reactions and takes into account the effect of interfacial mass transfer. Reactions rate depends on temperature corresponding to Arrhenius law. In this case, the model requires determining several kinetic parameters that is not possible when reaction scheme contains a large number of reactions. Selection of optimal kinetic parameters was implemented for reduced kinetical scheme. The alternating-variable descent method was used for this purpose. The system of equations was solved by Euler method. The results of numerical simulation are compared with experimental data of oil shale decomposition in inert atmosphere of nitrogen for isothermal conditions when the heating was carried out with given constant rate. In this paper it was shown that the chosen two-stage reaction scheme of oil shale decomposition taking into account the interfacial mass transfer ensures the satisfactory agreement with the experimental data to 700 K. The stage of quick product acumualation is replaced by the stage of the retardation of reaction. At temperatures below 700 K the interfacial mass transfer does not have a significant effect on the process. At high temperatures, the conformity with experiment turns significantly worse. It connects with the fact that the reduced kinetical model does not take into account the thermal effects of chemical reactions and the flow of products formed in the pores of the oil shale. These phenomena must be significant at high temperatures. Режим доступа: по договору с организацией-держателем ресурса |
| Мова: | Російська |
| Опубліковано: |
2017
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| Онлайн доступ: | http://elibrary.ru/item.asp?id=30520080 |
| Формат: | Електронний ресурс Частина з книги |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=658044 |