Journal
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
Volume 131, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.rser.2020.109997
Keywords
Anaerobic digestion; Biogas; Biogas combined-cycle; Dynamic analysis; Bioenergy; BECCS
Funding
- Petrobras S/A [5850.0107386.18.9]
- CNPq-Brazil [311076/2017-3]
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Anaerobic-digestion degrades organic wastes, producing biogas to drive bioenergy turbines reducing fossil-fuel dependence. This work evaluates the biogas chain fromwaste-to-bioenergy, using models for dynamic simulation of biogas processing, bioenergy generation, and carbon capture. To do this, a dynamic anaerobic digestion model from the literature was expanded to implement dependence on time-varying external temperature and feedstock conditions and to introduce aspects of transient power plants with time-dependent electricity demand. Results demonstrate that external temperature and feedstock oscillations promote dynamic cycles in biogas production which have to be handled in a dynamic biogas-combined-cycle power plant with post-combustion carbon capture to match costs and transient electricity demand. Consequently, dynamic biogas-storage and bioenergy-storage were implemented to cope with demand/production fluctuations. Bioenergy-storage is accomplished via compressed-air-storage during electricity surplus periods to drive pre-heated turboexpanders during deficit periods. The biogas-combined-cycle, without carbon capture and bioenergy-storage, achieves 15 years of paybacktime and 2.6 MMUSD net value. On the other hand, the sustainable configurations with/without bioenergy storage - both bioenergy with carbon-capture and storage systems achieving 1030 kg/h of negative emissions - reach feasibility for CO2 prices of 75 USD/tCO2 attaining net values of 2.02 and 0.18 MMUSD with 21 and 31 years of payback-time respectively. This implementation demonstrates that bioenergy storage with carbon negative emissions is feasible for small-scale biogas-fired combined-cycle plants.
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