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Chojnacki J, Kielar J, Najser J, Frantík J, Najser T, Mikeska M, Gaze B, Knutel B. Straw pyrolysis for use in electricity storage installations. Heliyon 2024; 10:e30058. [PMID: 38707407 PMCID: PMC11066651 DOI: 10.1016/j.heliyon.2024.e30058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2024] [Revised: 04/12/2024] [Accepted: 04/18/2024] [Indexed: 05/07/2024] Open
Abstract
A concept has been proposed for an installation designed to store excess electricity periodically occurring on the grid. Excess electricity will be used for straw pyrolysis. The main pyrolysis product, gas, will be used to generate electricity using a combustion generator to feed back power into the grid during periods of shortage. The resulting biochar from the pyrolysis can be introduced into the soil to improve soil quality and play a significant role in carbon sequestration. The system uses an electrically heated reactor with a screw conveyor. To preliminarily assess the feasibility of this system, experiments were carried out using wheat straw at temperatures of 300, 400, 500, 600, and 700 °C for the pyrolysis reactor. The resulting gas-to-feedstock mass ratio ranged from 29.04 % at 300 °C to 52.7 % at 700 °C reactor temperature, the biochar mass yield ratio to feedstock varied from 39.41 % to 27.36 % (at 700 °C), and the pyrolysis liquid ranged from 31.55 % to 27.36 % (at 700 °C). The pyrolytic liquid contained a high water content relative to its mass, reaching up to 95.2 % at 700 °C, rendering it less suitable as an energy feedstock. At a reactor temperature of 700 °C, the energy value of the gas produced from the feedstock was twice that of the electricity used for the pyrolysis process. These results suggest the feasibility and operation of the proposed installation.
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Affiliation(s)
- Jerzy Chojnacki
- VSB-Technical University of Ostrava, CEET, ENET Centre, 17. Listopadu 15, 708 00, Ostrava-Poruba, Czech Republic
- Institute of Technology and Life Sciences—National Research Institute, Falenty, Al. Hrabska 3, 05-090, Raszyn, Poland
| | - Jan Kielar
- VSB-Technical University of Ostrava, CEET, ENET Centre, 17. Listopadu 15, 708 00, Ostrava-Poruba, Czech Republic
| | - Jan Najser
- VSB-Technical University of Ostrava, CEET, ENET Centre, 17. Listopadu 15, 708 00, Ostrava-Poruba, Czech Republic
| | - Jaroslav Frantík
- VSB-Technical University of Ostrava, CEET, ENET Centre, 17. Listopadu 15, 708 00, Ostrava-Poruba, Czech Republic
| | - Tomáš Najser
- VSB-Technical University of Ostrava, CEET, ENET Centre, 17. Listopadu 15, 708 00, Ostrava-Poruba, Czech Republic
| | - Marcel Mikeska
- VSB-Technical University of Ostrava, CEET, ENET Centre, 17. Listopadu 15, 708 00, Ostrava-Poruba, Czech Republic
| | - Błażej Gaze
- Institute of Agricultural Engineering, Wrocław University of Environmental and Life Sciences, 51-630, Wroclaw, Chełmońskiego 37a, Poland
| | - Bernard Knutel
- Institute of Agricultural Engineering, Wrocław University of Environmental and Life Sciences, 51-630, Wroclaw, Chełmońskiego 37a, Poland
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