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首页> 外文期刊>Clean technologies and environmental policy >Biogas production from energy crops in northern Greece: economics of electricity generation associated with heat recovery in a greenhouse
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Biogas production from energy crops in northern Greece: economics of electricity generation associated with heat recovery in a greenhouse

机译：希腊北部能源作物产生的沼气：与温室热能回收相关的发电经济学

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Herein a techno-economic assessment was performed on an energy-crop-based biogas plant coupled with a greenhouse for utilizing thermal energy produced by cogeneration. Seven energy crops were evaluated: triticale, maize, alfalfa, sunflower, clover, barley and wheat. According to the evaluation, triticale was the most competitive energy crop under selected climate conditions for northern Greece. Although maize displays higher biomass yield and biogas potential than the drought-resistant crop triticale, it has high irrigation demand that contributes significantly to total production costs. For a triticale-based biogas production to become economically feasible, agricultural arable area larger than 500 ha, or biogas plant size larger than 1000 kW(el), is required. However, with public funding, biogas production becomes feasible at smaller area (>250 ha) or biogas plant size (>500 kW(el)). The inclusion of a greenhouse into the design of the biogas plant contributes positively to the economic viability of the entire system. Under this scenario, greenhouse financial income accounts for about 17-18% of total income. Results of a sensitivity analysis suggest that the selection of an appropriate energy crop for biogas production should be based principally on both digestibility (specific methane yield) and biomass yield per hectare, these factors being more critical than biomass production costs.
机译：在此，对基于能源作物的沼气厂与温室相结合进行了技术经济评估，该温室用于利用热电联产产生的热能。评价了七种能源作物：黑小麦，玉米，苜蓿，向日葵，三叶草，大麦和小麦。根据评估，黑小麦是希腊北部在特定气候条件下最具竞争力的能源作物。尽管玉米显示出比抗旱作物黑小麦更高的生物量产量和沼气潜力，但它对灌溉的需求很高，对总生产成本做出了重大贡献。为了使基于黑小麦的沼气生产在经济上可行，需要农业耕地面积大于500公顷或沼气厂规模大于1000 kW（el）。但是，有了公共资金，在较小的区域（> 250公顷）或沼气厂规模（> 500 kW（el））就可以生产沼气。在沼气厂的设计中加入温室对于整个系统的经济可行性有积极的贡献。在这种情况下，温室金融收入约占总收入的17-18％。敏感性分析的结果表明，为沼气生产选择合适的能源作物应主要基于每公顷的消化率（特定的甲烷产量）和生物质产量，这些因素比生物质生产成本更为关键。

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