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现代化的高效联合循环中，最大的不可逆损失是由于燃烧引起的。即使燃气轮机采取很高的温度，仍有将近30%的火用因为燃烧而被浪费掉了。而在燃料电池中，燃料的化学能量直接转化为电能，不受卡诺循环效率的限制。电化学反应过程中的火用损失要比常规的燃烧过程小得多。高效循环减少了二氧化碳排放而达到环境保护的目的，另外NO_x的排放量也比常规电厂大大减少。通过对已有管式固体氧化物燃料电池建模思路的考察，确立了零维模型结合ASPEN PLUSTM流程模拟的建模方法。模型采用天然气作为燃料输入，其验证的结果表明：该模型可以比较准确地预测不同工作条件下(独立的管式固体氧化物燃料电池发电系统或是构成混合循环)的管式固体氧化物燃料电池系统的性能。

MATHEMATICAL MODEL OF TUBULAR SOLID OXIDE FUEL CELLS 1)

The biggest irreversible loss is caused by burning in the modern efficient integrated cycle. Even though the gas turbine runs in high temperature, about 30% of enthalpy is wasted because of burning. In fuel cells, the chemical energy of the fuel is directly inverted into power without the limit of Canot cycle efficiency. The enthalpy loss is much less in the electro-chemical reaction process than in the common burning process. It reaches the goal of environment protection that CO 2 emitting is reduced with efficient cycle. Also, the NO X emitting is reduced even greater than that in ordinary power plants. With the examination of model establishing way for solid oxide fuel cells, the model-establishing technology with zero-dimension model integrated with ASPEN PLUS TM flow-sheet modeling is developed. The model uses natural gas as fuel feeding. The results show: the model can accurately predict the performance of tubular solid oxide fuel cells under different working conditions (independent power generating unit or cycle integrated with gas turbine).