Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Chongqing University, Ministry of Education, Chongqing 400044, China; Institute of Engineering Thermophysics, School of Energy and Power Engineering, Chongqing University, Chongqing 400044, China.
Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Chongqing University, Ministry of Education, Chongqing 400044, China; Institute of Engineering Thermophysics, School of Energy and Power Engineering, Chongqing University, Chongqing 400044, China.
Bioresour Technol. 2019 Oct;289:121709. doi: 10.1016/j.biortech.2019.121709. Epub 2019 Jun 27.
Biogas production from microalgae biomass without pretreatment and with hydrothermal pretreatment involve the energy with different quality and quantity, which makes it complex to evaluate thermodynamic performance. In this paper, exergy analyses were conducted in biogas production from microalgae biomass without pretreatment, with hydrothermal pretreatment, and with solar-driven hydrothermal pretreatment. The results showed that the materials and energy flow affected exergy efficiency in biogas production from microalgae biomass. The biogas production from microalgae biomass with solar-driven hydrothermal pretreatment achieved the highest exergy efficiency (40.85%), compared with that without pretreatment (26.2%) and with hydrothermal pretreatment (35.98%). In addition, the maximum exergy loss was caused by biogas residue, which accounted for 60.58%, 38.54%, and 35.13% of overall exergy input in biogas production from microalgae biomass without pretreatment, with hydrothermal pretreatment, and with solar-driven hydrothermal pretreatment, respectively. Exergy analyses provide important theoretical guidance to improve the performance of biogas production from microalgae biomass.
从微藻生物质中生产沼气，不进行预处理和进行水热预处理涉及不同质量和数量的能量，这使得评估热力学性能变得复杂。本文对未经预处理、经水热预处理和经太阳能驱动水热预处理的微藻生物质制沼气进行了火用分析。结果表明，物质和能量流影响了微藻生物质制沼气的火用效率。与未经预处理（26.2%）和经水热预处理（35.98%）相比，太阳能驱动水热预处理的微藻生物质制沼气获得了最高的火用效率（40.85%）。此外，沼气残渣造成的最大火用损失，分别占微藻生物质制沼气中未经预处理、经水热预处理和经太阳能驱动水热预处理的总火用输入的 60.58%、38.54%和 35.13%。火用分析为提高微藻生物质制沼气的性能提供了重要的理论指导。
