Abstract Bio-Energy with Carbon Capture and Storage (BECCS) system is emerging as a promising technology to support the development of low carbon power systems. In this context, the present research proposes two scenarios to obtain a biomass-fueled power plant with limited CO2 emissions. A novel combination of a downdraft gasifier (DG), internally fired gas turbine, Molten Carbonate Fuel Cell (MCFC), Organic Rankine Cycle (ORC), and cryogenic separation unit, is proposed (named scenario 1) and it is compared to a system in which a bottoming steam cycle (SBC) was used instead of the ORC (named scenario 2). To have a deeper insight into the performance of the integrations, a sensitivity analysis and comparative study have been developed in this research in terms of their thermodynamic and economic performance. Sensitivity analysis explores the effects of significant variables on the proposed system performance: fuel cell current density, fuel cell steam to carbon ratio, gas turbine inlet temperature, and CO2 and fuel utilization factors. Exergy and exergoeconomic analyses reveal that the air-preheater in scenario 1 and gasifier in scenario 2 are identified as the component with maximum exergy destruction rate (21% and 14% of total respectively) and HRU in scenario 1 and SBC condenser have the lowest value of the exergoeconomic factor (3.76% and 0.01% respectively) due to high thermodynamic inefficiencies, while MCFC in both scenarios has the highest exergoeconomic factor 87.29% and 80.67% respectively due to its high investment cost. Also, scenario 1 achieves the amount of 83.86 (USD/MWeh) for LCOE that is 55.76 (USD/MWeh) more than the reference case and 3.55 (USD/MWeh) less than the scenario 2.

中文翻译：

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生物质能发电厂与MCFC-低温CO2分离装置整合低碳发电：热力学和热力学比较分析

摘要 碳捕集与封存生物能源（BECCS）系统正在成为支持低碳电力系统发展的有前途的技术。在这种情况下，本研究提出了两种方案，以获得二氧化碳排放量有限的生物质燃料发电厂。提出了一种下吸式气化炉 (DG)、内燃式燃气轮机、熔融碳酸盐燃料电池 (MCFC)、有机朗肯循环 (ORC) 和低温分离装置的新型组合（命名为场景 1），并将其与系统进行比较其中使用底部蒸汽循环 (SBC) 代替 ORC（命名为场景 2）。为了更深入地了解集成的性能，本研究在热力学和经济性能方面进行了敏感性分析和比较研究。敏感性分析探讨了重要变量对拟议系统性能的影响：燃料电池电流密度、燃料电池蒸汽碳比、燃气轮机入口温度以及 CO2 和燃料利用因素。火用和火用经济学分析表明，场景1中的空气预热器和场景2中的气化器被确定为火用破坏率最大的组件（分别为总数的21%和14%），场景1中的HRU和SBC冷凝器的值最低因高热力学低效率而影响使用经济系数（分别为 3.76% 和 0.01%），而两种情景中的 MCFC 因其高投资成本而分别具有最高的使用经济系数 87.29% 和 80.67%。此外，场景 1 的 LCOE 达到 83.86（美元/兆瓦时），即 55。