Fast Pyrolysis of Hydrolysis Lignin in Fluidized Bed Reactors
| Autor: | Tom Granström, Taina Ohra-aho, Christian Lindfors, Juha Lehtonen, Anja Oasmaa, Minna Yamamoto, Elmeri Pienihäkkinen |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
organic polymers
020209 energy General Chemical Engineering water Energy Engineering and Power Technology Liquids biopolymers 02 engineering and technology pyrolysis 7. Clean energy 01 natural sciences complex mixtures 6. Clean water 010406 physical chemistry 0104 chemical sciences chemistry.chemical_compound Hydrolysis Fuel Technology Chemical engineering chemistry 13. Climate action Fluidized bed 0202 electrical engineering electronic engineering information engineering Lignin Pyrolysis |
| Zdroj: | Pienihäkkinen, E, Lindfors, C, Ohra-aho, T, Lehtonen, J, Granström, T, Yamamoto, M & Oasmaa, A 2021, ' Fast Pyrolysis of Hydrolysis Lignin in Fluidized Bed Reactors ', Energy & Fuels, vol. 35, no. 18, pp. 14758-14769 . https://doi.org/10.1021/acs.energyfuels.1c01719 |
| ISSN: | 1520-5029 0887-0624 |
| Popis: | Fast pyrolysis of hydrolysis lignin was studied in fluidized bed units. Hydrolysis lignin, a bioproduct from the lignocellulosic ethanol production process (St1 Cellunolix), was processed in bench scale bubbling fluidized bed (BFB) and pilot scale circulating fluidized bed (CFB) units. Utilization of steam and ethanol as hydrogen sources was tested in a BFB unit. Major technical challenges identified were related to slow reaction rates of lignin degradation and the rapid secondary reactions in the vapor phase resulting in deposit formation and pressure buildup in product gas lines. The carbohydrate content of hydrolysis lignin had a clear correlation to its processability. More challenges with clogging and bed agglomeration were observed with lignin feedstock having lower carbohydrate content. The challenges with the bed agglomeration in the BFB unit were overcome by adding a rapidly rotating mixer in the reactor to break the agglomerates. With the CFB unit, bed agglomeration was not a problem, due to high gas velocities and forces applied to sand and lignin particles. In the BFB unit, the screw feeder was cooled and no significant melting problems were observed. In the CFB unit, melting problems were avoided by feeding the raw material in the cold section of reactor. However, severe increases in the pressure buildup and deposit formation rates were observed in both units. Steam and ethanol was tested, separately, in the BFB unit, to provide excess hydrogen in the system. Based on the product analyses both added hydrogen into the system, but hydrogen ended up mostly in the gas phase. To enhance the hydrogen transfer to the organic liquid, a catalyst active in hydrogen transfer is probably needed. |
| Databáze: | OpenAIRE |
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