Bunya Bruno, Sotomonte César A R, Vitoriano Julio Alisson Aparecido, Pereira João Luiz Junho, de Souza Túlio Augusto Zucareli, Francisco Matheus Brendon, Coronado Christian J R
Mechanical Engineering Institute-IEM, Federal University of Itajubá-UNIFEI, Itajubá 37500-903, Brazil.
Chemical Engineering Institute, Federal University of Latin American Integration-UNILA, Foz do Iguaçu 85870-650, Brazil.
Entropy (Basel). 2024 Aug 17;26(8):698. doi: 10.3390/e26080698.
Bio-energy systems with carbon capture and storage (BECCS) will be essential if countries are to meet the gas emission reduction targets established in the 2015 Paris Agreement. This study seeks to carry out a thermodynamic optimization and analysis of a BECCS technology for a typical Brazilian cogeneration plant. To maximize generated net electrical energy (MWe) and carbon dioxide CO capture (Mt/year), this study evaluated six cogeneration systems integrated with a chemical absorption process using MEA. A key performance indicator (gCO/kWh) was also evaluated. The set of optimal solutions shows that the single regenerator configuration (REG1) resulted in more CO capture (51.9% of all CO emissions generated by the plant), penalized by 14.9% in the electrical plant's efficiency. On the other hand, the reheated configuration with three regenerators (Reheat3) was less power-penalized (7.41%) but had a lower CO capture rate (36.3%). Results showed that if the CO capture rates would be higher than 51.9%, the cogeneration system would reach a higher specific emission (gCO/kWh) than the cogeneration base plant without a carbon capture system, which implies that low capture rates (<51%) in the CCS system guarantee an overall net reduction in greenhouse gas emissions in sugarcane plants for power and ethanol production.
如果各国要实现2015年《巴黎协定》设定的气体减排目标，带有碳捕获与封存的生物能源系统（BECCS）将至关重要。本研究旨在对巴西一家典型的热电厂的BECCS技术进行热力学优化与分析。为了使净发电量（兆瓦）和二氧化碳捕获量（百万吨/年）最大化，本研究评估了六种与使用MEA的化学吸收过程集成的热电联产系统。还评估了一个关键性能指标（克二氧化碳/千瓦时）。这组最优解表明，单再生器配置（REG1）能捕获更多的二氧化碳（占电厂产生的所有二氧化碳排放量的51.9%），但电厂效率会降低14.9%。另一方面，带有三个再生器的再热配置（Reheat3）的功率损失较小（7.41%），但二氧化碳捕获率较低（36.3%）。结果表明，如果二氧化碳捕获率高于51.9%，热电联产系统的单位排放量（克二氧化碳/千瓦时）将高于没有碳捕获系统的热电联产基础电厂，这意味着CCS系统中低捕获率（<51%）能保证甘蔗制糖厂用于发电和生产乙醇时温室气体排放的总体净减少。
