Hybrid systems combine two or more power generating devices and make use of the synergism to generate maximum power and offer very high efficiencies.

The aim of this work is to investigate the performance achievable from a small-scale hybrid power plant based on the integration between a micro gas turbine (MGT) and a solid oxide fuel cell (SOFC) fed by the syngas generated by a biomass downdraft gasifier (BG). The thermal energy needed to reach the turbine inlet temperature is supplied by the exhausts coming from a catalytic burner in which the SOFC anode and cathode off-gases are burnt.

The hybrid BG-SOFC/MGT plant, based on a simplified configuration and realized considering components commercially available, is designed for optimizing not only the electric power generation, but also the thermal power production, in accordance with the promotion of decentralized CHP plants.

The performance assessment has been carried out by means of a numerical model, based on thermodynamic/thermochemical approaches and realized by integrating the models of each plant section, developed by using the Aspen Plus software package. The models validation, performed by using experimental data, demonstrates that the results produced are close to those obtained from each unit, so that the overall integrated model can provide a sufficiently accurate prediction of the expected actual hybrid power plant.

The effects of some operating parameters on cogeneration performances, such as the MGT pressure ratio and the S/C (steam to carbon) in the SOFC unit, have been evaluated and analyzed.

Results show that the best performances are achieved by assuming the MGT pressure ratio equal to 4.5 and the S/C equal to 0. In this case the electric power is 262 kW (SOFC supplies 180 kW), the thermal power is 405 kW and the electric (AC) and cogeneration efficiencies are 35% and 88%, respectively.

混合动力系统将两个或多个发电设备结合在一起，并利用协同作用产生最大功率并提供非常高的效率。

这项工作的目的是研究基于微型燃气轮机（MGT）和由生物质下降气流气化炉产生的合成气供入的固体氧化物燃料电池（SOFC）之间的集成，从小型混合动力电厂可实现的性能（BG）。达到涡轮机入口温度所需的热能由催化燃烧器的废气提供，在催化燃烧器中燃烧SOFC阳极和阴极废气。

BG-SOFC / MGT混合电站基于简化的配置并考虑到市售组件而实现，旨在根据分散式CHP电站的发展，不仅优化发电量，而且优化火力发电量。

性能评估是通过基于热力学/热化学方法的数值模型进行的，并且通过集成使用Aspen Plus软件包开发的每个工厂部分的模型来实现。通过使用实验数据进行的模型验证表明，所产生的结果接近于从每个单元获得的结果，因此整体集成模型可以为预期的实际混合动力电厂提供足够准确的预测。

已经评估和分析了某些运行参数对热电联产性能的影响，例如MGT压力比和SOFC单元中的S / C（蒸汽与碳）。

结果表明，通过假设MGT压力比等于4.5和S / C等于0，可以获得最佳性能。在这种情况下，电功率为262 kW（SOFC提供180 kW），热功率为405 kW，而热功率为405 kW。电力（AC）和热电联产效率分别为35％和88％。