Analysis of the Physicochemical Characteristics of Biochar Obtained by Slow Pyrolysis of Nut Shells in a Nitrogen Atmosphere; Energies; Vol. 14, iss. 23
| Parent link: | Energies Vol. 14, iss. 23.— 2021.— [8075, 18 p.] |
|---|---|
| Institution som forfatter: | |
| Andre forfattere: | , , , , , , |
| Summary: | Title screen The process of slow pyrolysis of seven nut shell samples, in a nitrogen-purged atmosphere, has been studied, as well as characteristics of biochar obtained. The heat carrier with a temperature of 400-600 °C (with a step of 100 °C) was supplied indirectly using a double-walled reactor. The heating rate was 60 °C/min. At increased temperature of the heating medium, a decrease in the amount of the resulting carbon residue averaged 6.2 wt%. The release of non-condensable combustible gas-phase compounds CO, CH4, and H2, with maximum concentrations of 12.7, 14.0, and 0.7 vol%, respectively, was registered. The features of the obtained biochar sample conversions were studied using thermal analysis in inert (nitrogen) and oxidative (air) mediums at 10 °C/min heating rate. Kinetic analysis was performed using Coats-Redfern method. Thermal analysis showed that the main weight loss (Δm = 32.8-43.0 wt%) occurs at temperatures ranging between 290 °C and 400 °C, which is due to cellulose decomposition. The maximum carbon content and, hence, heat value were obtained for biochars made from macadamia nut and walnut shells. An increased degree of coalification of the biochar samples affected their reactivity and, in particular, caused an increase in the initial temperature of intense oxidation (on average, by 73 °C). While technical and elemental composition of nut shell samples studied were quite similar, the morphology of obtained biochar was different. The morphology of particles was also observed to change as the heating medium temperature increased, which was expressed in the increased inhomogeneity of particle surface. The activation energy values, for biochar conversion in an inert medium, were found to vary in the range of 10-35 kJ/mol and, in an oxidative medium-50-80 kJ/mol. According to literature data, these values were characteristic for lignin fibers decomposition and oxidation, respectively. |
| Sprog: | engelsk |
| Udgivet: |
2021
|
| Fag: | |
| Online adgang: | https://doi.org/10.3390/en14238075 |
| Format: | Electronisk Book Chapter |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=667519 |
MARC
| LEADER | 00000naa0a2200000 4500 | ||
|---|---|---|---|
| 001 | 667519 | ||
| 005 | 20250317165248.0 | ||
| 035 | |a (RuTPU)RU\TPU\network\38724 | ||
| 035 | |a RU\TPU\network\37742 | ||
| 090 | |a 667519 | ||
| 100 | |a 20220330d2021 k||y0rusy50 ba | ||
| 101 | 0 | |a eng | |
| 102 | |a CH | ||
| 135 | |a drcn ---uucaa | ||
| 181 | 0 | |a i | |
| 182 | 0 | |a b | |
| 200 | 1 | |a Analysis of the Physicochemical Characteristics of Biochar Obtained by Slow Pyrolysis of Nut Shells in a Nitrogen Atmosphere |f A. S. Gorshkov, N. I. Berezikov, A. Kaltaev [et al.] | |
| 203 | |a Text |c electronic | ||
| 300 | |a Title screen | ||
| 320 | |a [References: 40 tit.] | ||
| 330 | |a The process of slow pyrolysis of seven nut shell samples, in a nitrogen-purged atmosphere, has been studied, as well as characteristics of biochar obtained. The heat carrier with a temperature of 400-600 °C (with a step of 100 °C) was supplied indirectly using a double-walled reactor. The heating rate was 60 °C/min. At increased temperature of the heating medium, a decrease in the amount of the resulting carbon residue averaged 6.2 wt%. The release of non-condensable combustible gas-phase compounds CO, CH4, and H2, with maximum concentrations of 12.7, 14.0, and 0.7 vol%, respectively, was registered. The features of the obtained biochar sample conversions were studied using thermal analysis in inert (nitrogen) and oxidative (air) mediums at 10 °C/min heating rate. Kinetic analysis was performed using Coats-Redfern method. Thermal analysis showed that the main weight loss (Δm = 32.8-43.0 wt%) occurs at temperatures ranging between 290 °C and 400 °C, which is due to cellulose decomposition. The maximum carbon content and, hence, heat value were obtained for biochars made from macadamia nut and walnut shells. An increased degree of coalification of the biochar samples affected their reactivity and, in particular, caused an increase in the initial temperature of intense oxidation (on average, by 73 °C). While technical and elemental composition of nut shell samples studied were quite similar, the morphology of obtained biochar was different. The morphology of particles was also observed to change as the heating medium temperature increased, which was expressed in the increased inhomogeneity of particle surface. The activation energy values, for biochar conversion in an inert medium, were found to vary in the range of 10-35 kJ/mol and, in an oxidative medium-50-80 kJ/mol. According to literature data, these values were characteristic for lignin fibers decomposition and oxidation, respectively. | ||
| 461 | |t Energies | ||
| 463 | |t Vol. 14, iss. 23 |v [8075, 18 p.] |d 2021 | ||
| 610 | 1 | |a электронный ресурс | |
| 610 | 1 | |a труды учёных ТПУ | |
| 610 | 1 | |a nut shell | |
| 610 | 1 | |a pyrolysis | |
| 610 | 1 | |a biochar | |
| 610 | 1 | |a heating medium temperature | |
| 610 | 1 | |a gas-phase products | |
| 610 | 1 | |a heat of combustion | |
| 610 | 1 | |a elemental composition | |
| 610 | 1 | |a скорлупа | |
| 610 | 1 | |a пиролиз | |
| 610 | 1 | |a биоугли | |
| 610 | 1 | |a температура | |
| 610 | 1 | |a теплоносители | |
| 610 | 1 | |a теплота | |
| 610 | 1 | |a сгорание | |
| 610 | 1 | |a элементный состав | |
| 610 | 1 | |a физико-химические характеристики | |
| 701 | 1 | |a Gorshkov |b A. S. |c physicist |c Associate Scientist of Tomsk Polytechnic University |f 1999- |g Alexander Sergeevich |3 (RuTPU)RU\TPU\pers\47567 | |
| 701 | 1 | |a Berezikov |b N. I. |g Nikolay Igorevich | |
| 701 | 1 | |a Kaltaev |b A. |c Physicist |c Assistant of the Department of Tomsk Polytechnic University |f 1995- |g Albert |3 (RuTPU)RU\TPU\pers\47142 | |
| 701 | 1 | |a Yankovsky |b S. A. |c specialist in the field of power engineering |c Associate Professor, Researcher of Tomsk Polytechnic University, Candidate of Technical Sciences |f 1985- |g Stanislav Aleksandrovich |3 (RuTPU)RU\TPU\pers\34772 |9 18121 | |
| 701 | 1 | |a Slyusarsky |b K. V. |c specialist in the field of power engineering |c assistant of Tomsk Polytechnic University |f 1990- |g Konstantin Vitalievich |3 (RuTPU)RU\TPU\pers\35634 | |
| 701 | 1 | |a Tabakaev |b R. B. |c specialist in the field of heat and power engineering |c researcher of Tomsk Polytechnic University, Candidate of Sciences |f 1986- |g Roman Borisovich |3 (RuTPU)RU\TPU\pers\32988 |9 16833 | |
| 701 | 1 | |a Larionov |b K. B. |c specialist in the field of power engineering |c technician of Tomsk Polytechnic University |f 1990- |g Kirill Borisovich |3 (RuTPU)RU\TPU\pers\35705 | |
| 712 | 0 | 2 | |a Национальный исследовательский Томский политехнический университет |b Инженерная школа энергетики |b Научно-образовательный центр И. Н. Бутакова (НОЦ И. Н. Бутакова) |3 (RuTPU)RU\TPU\col\23504 |
| 801 | 2 | |a RU |b 63413507 |c 20230516 |g RCR | |
| 856 | 4 | |u https://doi.org/10.3390/en14238075 | |
| 942 | |c CF | ||