Influence of Bio-Coal Properties on Carbonization and Bio-Coke Reactivity
Coke corresponds to 2/3–3/4 of the reducing agents in BF, and by the partial replacement of coking coals with 5–10% of bio-coal, the fossil CO<sub>2</sub> emissions from the BF can be lowered by ~4–8%. Coking coal blends with 5% and 10% additions of bio-coals (pre-treated biomass) of dif...
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MDPI AG
2021-10-01
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| Online Access: | https://www.mdpi.com/2075-4701/11/11/1752 |
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| author | Asmaa A. El-Tawil Bo Björkman Maria Lundgren Astrid Robles Lena Sundqvist Ökvist |
| author_facet | Asmaa A. El-Tawil Bo Björkman Maria Lundgren Astrid Robles Lena Sundqvist Ökvist |
| author_sort | Asmaa A. El-Tawil |
| collection | DOAJ |
| description | Coke corresponds to 2/3–3/4 of the reducing agents in BF, and by the partial replacement of coking coals with 5–10% of bio-coal, the fossil CO<sub>2</sub> emissions from the BF can be lowered by ~4–8%. Coking coal blends with 5% and 10% additions of bio-coals (pre-treated biomass) of different origins and pre-treatment degrees were carbonized at laboratory scale and with a 5% bio-coal addition at technical scale, aiming to understand the impact on the bio-coal properties (ash amount and composition, volatile matter content) and the addition of bio-coke reactivity. A thermogravimetric analyzer (TGA) connected to a quadrupole mass spectroscope monitored the residual mass and off-gases during carbonization. To explore the effect of bio-coal addition on plasticity, optical dilatometer tests were conducted for coking coal blends with 5% and 10% bio-coal addition. The plasticity was lowered with increasing bio-coal addition, but pyrolyzed biomass had a less negative effect on the plasticity compared to torrefied biomasses with a high content of oxygen. The temperature for starting the gasification of coke was in general lowered to a greater extent for bio-cokes produced from coking coal blends containing bio-coals with higher contents of catalyzing oxides. There was no significant difference in the properties of laboratory and technical scale produced coke, in terms of reactivity as measured by TGA. Bio-coke produced with 5% of high temperature torrefied pelletized biomass showed a similar coke strength as reference coke after reaction. |
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| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-10T05:17:18Z |
| publishDate | 2021-10-01 |
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| spelling | doaj.art-f58410f638c2496499813d8e95a3fc4e2023-11-23T00:23:03ZengMDPI AGMetals2075-47012021-10-011111175210.3390/met11111752Influence of Bio-Coal Properties on Carbonization and Bio-Coke ReactivityAsmaa A. El-Tawil0Bo Björkman1Maria Lundgren2Astrid Robles3Lena Sundqvist Ökvist4MiMeR, Luleå University of Technology, 971 87 Luleå, SwedenMiMeR, Luleå University of Technology, 971 87 Luleå, SwedenSwerim AB, Box 812, 971 25 Luleå, SwedenSwerim AB, Box 812, 971 25 Luleå, SwedenMiMeR, Luleå University of Technology, 971 87 Luleå, SwedenCoke corresponds to 2/3–3/4 of the reducing agents in BF, and by the partial replacement of coking coals with 5–10% of bio-coal, the fossil CO<sub>2</sub> emissions from the BF can be lowered by ~4–8%. Coking coal blends with 5% and 10% additions of bio-coals (pre-treated biomass) of different origins and pre-treatment degrees were carbonized at laboratory scale and with a 5% bio-coal addition at technical scale, aiming to understand the impact on the bio-coal properties (ash amount and composition, volatile matter content) and the addition of bio-coke reactivity. A thermogravimetric analyzer (TGA) connected to a quadrupole mass spectroscope monitored the residual mass and off-gases during carbonization. To explore the effect of bio-coal addition on plasticity, optical dilatometer tests were conducted for coking coal blends with 5% and 10% bio-coal addition. The plasticity was lowered with increasing bio-coal addition, but pyrolyzed biomass had a less negative effect on the plasticity compared to torrefied biomasses with a high content of oxygen. The temperature for starting the gasification of coke was in general lowered to a greater extent for bio-cokes produced from coking coal blends containing bio-coals with higher contents of catalyzing oxides. There was no significant difference in the properties of laboratory and technical scale produced coke, in terms of reactivity as measured by TGA. Bio-coke produced with 5% of high temperature torrefied pelletized biomass showed a similar coke strength as reference coke after reaction.https://www.mdpi.com/2075-4701/11/11/1752bio-coalscarbonizationgasificationreactivitydilatationfluidity |
| spellingShingle | Asmaa A. El-Tawil Bo Björkman Maria Lundgren Astrid Robles Lena Sundqvist Ökvist Influence of Bio-Coal Properties on Carbonization and Bio-Coke Reactivity Metals bio-coals carbonization gasification reactivity dilatation fluidity |
| title | Influence of Bio-Coal Properties on Carbonization and Bio-Coke Reactivity |
| title_full | Influence of Bio-Coal Properties on Carbonization and Bio-Coke Reactivity |
| title_fullStr | Influence of Bio-Coal Properties on Carbonization and Bio-Coke Reactivity |
| title_full_unstemmed | Influence of Bio-Coal Properties on Carbonization and Bio-Coke Reactivity |
| title_short | Influence of Bio-Coal Properties on Carbonization and Bio-Coke Reactivity |
| title_sort | influence of bio coal properties on carbonization and bio coke reactivity |
| topic | bio-coals carbonization gasification reactivity dilatation fluidity |
| url | https://www.mdpi.com/2075-4701/11/11/1752 |
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