Computational Study of the Yield of Solid Wood Pyrolysis Products under High Pressure
The kinetic model of wood pyrolysis under pressure is discussed in the present paper taking into account the diffusion of the resulting gas-phase products (i.e. heavy hydrocarbons) and their decomposition reactions. This model is based on a simplified mechanism of wood pyrolysis, including two paral...
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| Language: | Russian |
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Belarusian National Technical University
2020-05-01
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| Series: | Известия высших учебных заведений и энергетических объединенний СНГ: Энергетика |
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| Online Access: | https://energy.bntu.by/jour/article/view/1961 |
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| author | S. V. Vasilevich M. V. Malko D. V. Degterov A. N. Asadchyi |
| author_facet | S. V. Vasilevich M. V. Malko D. V. Degterov A. N. Asadchyi |
| author_sort | S. V. Vasilevich |
| collection | DOAJ |
| description | The kinetic model of wood pyrolysis under pressure is discussed in the present paper taking into account the diffusion of the resulting gas-phase products (i.e. heavy hydrocarbons) and their decomposition reactions. This model is based on a simplified mechanism of wood pyrolysis, including two parallel chemical reactions, viz. the primary decomposition reaction of wood biomass with the formation of solid and gaseous components and the thermal decomposition reaction in the biomass pores of hydrocarbons formed in the primary process. The model takes into account the diffusion processes of the primary pyrolysis products from the resulting pores and thermal decomposition in the pores of these products. Based on the developed model, a computer program for calculating the main parameters of the pyrolysis process under pressure was created and the mass yield of solid pyrolysis products under various conditions was calculated. The calculation took into account the main parameters that affect the yield of solid wood biomass products, viz. temperature and pyrolysis pressure, particle sizes, porosity, etc. The calculations demonstrated that the increase of the pressure at which the pyrolysis of wood biomass is carried out causes an increase of the formation of the amount of solid products, which corresponds to the available experimental data. It was established that at a pressure of 1 atm when a sample size is of 0.025 m, the maximum yield of solid products is observed at the temperature of 600 °C. As the pressure increases the maximum yield increases, while the temperature at which the maximum is reached decreases. So, at a pressure of 10 atm when a particle size is of 0.025 m, the maximum yield of solid products is observed at the temperature of about 500 °C, and it is higher than that at 1 atm by 1.18 times. It was also determined that the temperature of the maximum yield of charcoal decreases with increasing sizes of pyrolyzable samples. Thus, when a sample size is of 0.5 m, this temperature is about 400 °C at 10 atm. |
| format | Article |
| id | doaj-art-6760da58b7954ff09263f30e1135da8e |
| institution | Kabale University |
| issn | 1029-7448 2414-0341 |
| language | Russian |
| publishDate | 2020-05-01 |
| publisher | Belarusian National Technical University |
| record_format | Article |
| series | Известия высших учебных заведений и энергетических объединенний СНГ: Энергетика |
| spelling | doaj-art-6760da58b7954ff09263f30e1135da8e2025-08-20T03:38:31ZrusBelarusian National Technical UniversityИзвестия высших учебных заведений и энергетических объединенний СНГ: Энергетика1029-74482414-03412020-05-0163325326310.21122/1029-7448-2020-63-3-253-2631717Computational Study of the Yield of Solid Wood Pyrolysis Products under High PressureS. V. Vasilevich0M. V. Malko1D. V. Degterov2A. N. Asadchyi3Belarusian State Academy of AviationInstitute of Power Engineering of the National Academy of Sciences of BelarusInstitute of Power Engineering of the National Academy of Sciences of BelarusInstitute of Power Engineering of the National Academy of Sciences of BelarusThe kinetic model of wood pyrolysis under pressure is discussed in the present paper taking into account the diffusion of the resulting gas-phase products (i.e. heavy hydrocarbons) and their decomposition reactions. This model is based on a simplified mechanism of wood pyrolysis, including two parallel chemical reactions, viz. the primary decomposition reaction of wood biomass with the formation of solid and gaseous components and the thermal decomposition reaction in the biomass pores of hydrocarbons formed in the primary process. The model takes into account the diffusion processes of the primary pyrolysis products from the resulting pores and thermal decomposition in the pores of these products. Based on the developed model, a computer program for calculating the main parameters of the pyrolysis process under pressure was created and the mass yield of solid pyrolysis products under various conditions was calculated. The calculation took into account the main parameters that affect the yield of solid wood biomass products, viz. temperature and pyrolysis pressure, particle sizes, porosity, etc. The calculations demonstrated that the increase of the pressure at which the pyrolysis of wood biomass is carried out causes an increase of the formation of the amount of solid products, which corresponds to the available experimental data. It was established that at a pressure of 1 atm when a sample size is of 0.025 m, the maximum yield of solid products is observed at the temperature of 600 °C. As the pressure increases the maximum yield increases, while the temperature at which the maximum is reached decreases. So, at a pressure of 10 atm when a particle size is of 0.025 m, the maximum yield of solid products is observed at the temperature of about 500 °C, and it is higher than that at 1 atm by 1.18 times. It was also determined that the temperature of the maximum yield of charcoal decreases with increasing sizes of pyrolyzable samples. Thus, when a sample size is of 0.5 m, this temperature is about 400 °C at 10 atm.https://energy.bntu.by/jour/article/view/1961woodthermal decompositionoverpressuresecondary reactionsreaction rate constantsmass yield |
| spellingShingle | S. V. Vasilevich M. V. Malko D. V. Degterov A. N. Asadchyi Computational Study of the Yield of Solid Wood Pyrolysis Products under High Pressure Известия высших учебных заведений и энергетических объединенний СНГ: Энергетика wood thermal decomposition overpressure secondary reactions reaction rate constants mass yield |
| title | Computational Study of the Yield of Solid Wood Pyrolysis Products under High Pressure |
| title_full | Computational Study of the Yield of Solid Wood Pyrolysis Products under High Pressure |
| title_fullStr | Computational Study of the Yield of Solid Wood Pyrolysis Products under High Pressure |
| title_full_unstemmed | Computational Study of the Yield of Solid Wood Pyrolysis Products under High Pressure |
| title_short | Computational Study of the Yield of Solid Wood Pyrolysis Products under High Pressure |
| title_sort | computational study of the yield of solid wood pyrolysis products under high pressure |
| topic | wood thermal decomposition overpressure secondary reactions reaction rate constants mass yield |
| url | https://energy.bntu.by/jour/article/view/1961 |
| work_keys_str_mv | AT svvasilevich computationalstudyoftheyieldofsolidwoodpyrolysisproductsunderhighpressure AT mvmalko computationalstudyoftheyieldofsolidwoodpyrolysisproductsunderhighpressure AT dvdegterov computationalstudyoftheyieldofsolidwoodpyrolysisproductsunderhighpressure AT anasadchyi computationalstudyoftheyieldofsolidwoodpyrolysisproductsunderhighpressure |