Abstract This article addresses the simulation and life cycle assessment of a biogas-to-liquid plant for the coproduction of synthetic fuels (diesel and gasoline) and electricity. The system comprises a biogas dry reforming process to produce syngas, Fischer-Tropsch synthesis, and a combined-cycle process. A detailed reaction model of the dry reforming process is implemented in the simulation of the system in Aspen Plus®. Inventory data obtained mainly through process simulation are used to evaluate the environmental performance of the system in terms of global warming, cumulative non-renewable energy demand, ozone layer depletion, acidification, and eutrophication. In particular, the life-cycle environmental profile of synthetic biodiesel as the main product of the biogas-to-liquid plant is calculated and compared with that of conventional diesel. Overall, the performance of the synthetic biodiesel product is not found to be environmentally favourable, which suggests the need for further optimising the biogas-to-liquid system to make it competitive with conventional systems. In this sense, biogas production and direct emissions to the air from the biogas-to-liquid plant arise as the main sources of impact.

中文翻译：

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通过沼气干重整和费托合成生产的合成燃料的模拟和生命周期评估

摘要 本文讨论了用于联合生产合成燃料（柴油和汽油）和电力的沼气液化工厂的模拟和生命周期评估。该系统包括沼气干重整工艺以生产合成气、费托合成和联合循环工艺。在 Aspen Plus® 系统的模拟中实现了干重整过程的详细反应模型。主要通过过程模拟获得的清单数据用于评估系统在全球变暖、累积不可再生能源需求、臭氧层消耗、酸化和富营养化方面的环境绩效。特别是，计算了作为沼气液化厂主要产品的合成生物柴油的生命周期环境特征，并与传统柴油进行了比较。总体而言，合成生物柴油产品的性能没有发现对环境有利，这表明需要进一步优化沼气液化系统，使其与传统系统竞争。从这个意义上说，沼气生产和从沼气液化工厂直接排放到空气中是影响的主要来源。