| Title |
Interaction between coal and lignin briquettes in co-carbonization |
| ID_Doc |
9787 |
| Authors |
Koskela, A; Suopajarvi, H; Fabritius, T |
| Title |
Interaction between coal and lignin briquettes in co-carbonization |
| Year |
2022 |
| Published |
|
| DOI |
10.1016/j.fuel.2022.124823 |
| Abstract |
The utilization of bio-based side streams in metallurgical coke making promotes two major factors in the mitigation of climate impact in the steel industry. Circular economy as the waste material from biorefinery industry is utilized as a raw material in the steel industry, and mitigation of the production of fossil-based CO2 emissions. In this work, lignin from the hydrolysis process was used in a briquetted form as part of the raw material blend in metallurgical coke making. For the experiments and analyses, lignin briquettes were pyrolyzed at 450, 600 and 1200 degrees C, while one sample was left non-pyrolyzed. In the co-carbonization of briquetted lignin, lignin chars and bituminous coal, the focus was to evaluate the interaction between char and coal in the carbonization. This was studied by thermogravimetric analysis (TGA), optical dilatometry, and light optical microscopy. The results suggested that the interaction between the coal and lignin reduced when the pyrolysis temperature of the briquettes, prior to co-carbonization, was elevated. This was due to the decrease of overlapping of the pyrolysis rates of chars and coking coal. Combined with the dilation and shrinking behaviour of the chars, presented in this paper, separate char and coke structures were formed in the final coke in co-carbonization. |
| Author Keywords |
Pyrolysis; Biochar; Briquettes; Biocoke; Co-carbonization; Hydrolysis lignin; Coking coal |
| Index Keywords |
Index Keywords |
| Document Type |
Other |
| Open Access |
Open Access |
| Source |
Science Citation Index Expanded (SCI-EXPANDED) |
| EID |
WOS:000824288300001 |
| WoS Category |
Energy & Fuels; Engineering, Chemical |
| Research Area |
Energy & Fuels; Engineering |
| PDF |
https://doi.org/10.1016/j.fuel.2022.124823
|