期刊
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
卷 137, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.rser.2020.110652
关键词
Biomass energy; Energy return on investment; Energy cost; System boundary; Energy quality; China
资金
- National Natural Science Foundation of China [41701625, 71834003]
- China Postdoctoral Science Foundation [2019M661832]
- National Science and Technology Major Project of the Ministry of Science and Technology of China [2017YFC0505703]
- Sino-Italian Cooperation of China Natural Science Foundation (CNSC) [71861137001]
This study analyzed the energy return on investment (EROI) of typical biomass conversion systems in China, finding that converting raw biomass feedstock to solid fuel had the highest EROI. Biofuels had a higher average EROI compared to fossil fuels, indicating clear energy-saving benefits. Enhancing energy efficiency is key to improving the economic feasibility of biomass energy industries.
As China continues to focus on renewable energy in its future development, the energy performance of biofuels has become a hot research topic. However, existing bioenergy assessments have used diverse indexes and inconsistent system boundaries, hindering the comparative analysis of different technologies. Generally, improvements in energy quality (e.g., from solid to gaseous fuel) are accompanied by increases in nonrenewable energy investment. To quantify this trade-off, this study examined the energy return on investment (EROI) of typical biomass conversion systems in China-namely, biomass compression, biodiesel, bioethanol, biogas, biomass gasification, and biomass power generation. Various feedstocks were considered, including firstgeneration (e.g., corn), second-generation (e.g., corn straw), and third-generation (e.g., algae) feedstock options. The system boundaries of previous biomass footprint calculations are unified to make the results comparable. The results showed that converting raw biomass feedstock to solid fuel had the highest EROI (8.0624.13), followed by biomass power (2.07-16.48), biogas (1.24-11.05), biodiesel (1.28-2.23), second-generation bioethanol (1.18-9.90), first-generation bioethanol (0.68-3.12), and biomass gasification (1.12-1.57). Compared with fossil fuels (e.g., gasoline, diesel), biofuels had a higher average EROI, indicating obvious energy-saving benefits. Among all biomass conversion pathways, pyrolysis gasification had the highest EROI opportunity cost for both straw and wood residues. This study's findings highlight the need for consistent system boundaries in bioenergy technology deployment to quantify the EROI opportunity cost of each biomass conversion pathway, and recognize the importance of energy efficiency promotion to enhance the economic feasibility of biomass energy industries.
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