New technologies are being developed to produce electricity cleaner and more efficient. Promising technologies among these are the solid oxide fuel cell and the supercritical carbon dioxide Brayton cycle. This study investigates the potential of integrating both technologies.

The solid oxide fuel cell is known as a potentially clean and highly efficient technology to convert chemical energy to electricity. The high operating temperatures (600–1000 °C) allow the possibility of a bottoming cycle to utilize the high quality excess heat and also facilitate reforming processes, making it possible to use higher hydrocarbons as fuel.

The supercritical carbon dioxide Brayton cycle has received attention as a promising power cycle. It has already been identified as a suitable cycle for relatively low temperature, compared to traditional gas turbines, heat sources for several reasons.

Firstly because of the high efficiency, around 40%–45% for the common simple recuperative cycle. Secondly, because the turbine inlet temperature of a supercritical carbon dioxide is around 700 °C is low, compared to well over 1000 °C for a common air Brayton cycle. This is especially of interest because solid oxide fuel cell developers are targeting lower operating temperatures to avoid the use of exotic and expensive materials. And thirdly, the cycle can operate entirely above the critical point. Therefore the temperature increases gradually with the energy added to the cycle. This is more suitable for waste heat because the exergy loss decreases and more low temperature heat can be utilized compared to a steam Rankine cycle where most of the heat is added above the relatively high boiling point of pressurized water.

A thermodynamic model of the solid oxide fuel cell- supercritical carbon dioxide Brayton cycle hybrid system is developed to explore and analyze different concepts of integration.

Several conclusions are drawn. Firstly it is found that recirculating cathodic air increases the efficiency of the system and decreases the size of the heat exchangers. Secondly, applying a pinch point optimization decreases the size of the heat exchangers but increases the complexity of the system while the efficiency is not much affected. Thirdly, applying the recompression cycle in stead of a simple recuperative supercritical carbon dioxide cycle increases the efficiency of the system but not as significantly when operating the supercritical carbon dioxide as a stand-alone system while the complexity of the system increases even more. And finally, compared to a directly coupled solid oxide fuel cell-gas turbine system the solid oxide fuel cell- supercritical carbon dioxide Brayton cycle hybrid system is more efficient but significantly more complex.

正在开发新技术以生产更清洁，更高效的电力。其中有前途的技术是固体氧化物燃料电池和超临界二氧化碳布雷顿循环。这项研究调查了整合这两种技术的潜力。

固态氧化物燃料电池是一种将化学能转化为电能的潜在清洁和高效技术。较高的工作温度（600–1000°C）使得可能进行触底循环，以利用高质量的多余热量，也有助于重整过程，从而可以使用高级碳氢化合物作为燃料。

超临界二氧化碳布雷顿循环作为一种有前途的动力循环受到了关注。与传统燃气轮机热源相比，由于多种原因，它已经被确定为适合较低温度的循环。

首先，由于效率高，普通的简单换热周期约为40％–45％。其次，由于超临界二氧化碳的涡轮入口温度约为700°C，因此与普通空气布雷顿循环的1000℃以上相比，该温度较低。这是特别令人感兴趣的，因为固体氧化物燃料电池开发人员的目标是降低工作温度，以避免使用奇特和昂贵的材料。第三，周期可以完全在临界点以上运行。因此，温度随着能量的增加而逐渐增加。与蒸汽朗肯循环相比，这更适合于废热，因为它的本能损失减少了，并且可以利用更多的低温热量，在蒸汽朗肯循环中，大部分热量被添加到加压水的相对较高沸点之上。

建立了固体氧化物燃料电池-超临界二氧化碳布雷顿循环混合系统的热力学模型，以探索和分析集成的不同概念。

得出了一些结论。首先，发现再循环阴极空气增加了系统的效率并减小了热交换器的尺寸。其次，应用收缩点优化可减小热交换器的尺寸，但会增加系统的复杂性，而效率不会受到太大影响。第三，应用再压缩循环代替简单的同流换热超临界二氧化碳循环可提高系统的效率，但在运行超临界二氧化碳时不如独立系统那样显着，而系统的复杂性甚至更高。最后，