Abstract

The feasibility of using fuel-cell-based power installations (FСBPI) in auxiliary power (AP) systems at thermal gas/oil or gas-fired power stations is discussed. In this case, two options can be implemented at once: replacement of some district water heaters at a thermal power plant (TPS) with heaters using the heat of reaction products in FСBPIs and parallel power generation by TPS with the Rankine cycle and FСBPI. A thermodynamic analysis has demonstrated an increase in the thermal efficiency of TPSs since an FСBPI complex increases power delivery to a power system. Calculations were performed for a 300-MW power unit at a condensing power station (CPS). In particular, the installed capacity of FСBPIs was considered assuming that its thermal output is equal to the thermal output of network water heaters. In this case, additional power generation by the TPS power unit proper amounts to 50 632.8 MW h. Gas is supplied to the CPS power unit and FСBPIs from the same system. It is demonstrated that construction of such a complex is feasible if the FСBPI efficiency is higher than the net efficiency of the CPS power unit. This also yields natural gas saving throughout a year. The payback of the proposal for the use of FСBPIs is based on an increase in the KPS power output due to an increase in the thermal efficiency and the fact the FСBPIs deliver additional power (minus the auxiliary power) to the power system. In addition, turbine steam extraction to network water heaters and the generator power take-off to cover auxiliary power needs are eliminated. Therefore, according to the simplified calculations, the payback period for 25 MW FСBPIs operating on natural gas as a part of a 300-MW gas-fired CPS is approximately 2 years. The maneuverability of the CPS increases considerably within the FCBPI’s installed capacity.

中文翻译：

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基于燃料电池的电力装置在火力发电厂中的应用

摘要

讨论了在热气/油或燃气发电站的辅助电源（AP）系统中使用基于燃料电池的电源装置（FСBPI）的可行性。在这种情况下，可以立即实现两个选择：使用FСBPI中反应产物的热量用加热器替换热电厂（TPS）中的某些区域热水器，以及使用兰金循环和FСBPI由TPS并行发电。热力学分析表明，TPS的热效率有所提高，因为FСBPI复合物增加了向电力系统的功率输送。对冷凝电站（CPS）的300 MW机组进行了计算。尤其是在考虑FСBPI的装机容量时，假设其热输出等于网络热水器的热输出。在这种情况下，TPS动力单元产生的额外发电量总计为50 632.8 MW h。气体从同一系统供应到CPS功率单元和FСBPI。事实证明，如果FСBPI效率高于CPS功率单元的净效率，则建造这样的综合体是可行的。这还可以全年节省天然气。使用FСBPI的建议的投资回报是基于KPS功率输出的增加，这是由于热效率的提高以及FСBPI向电力系统输送额外的功率（减去辅助功率）所致。此外，消除了向网络热水器抽汽的汽轮机蒸汽以及满足辅助动力需求的发电机取力器。因此，根据简化的计算，作为300兆瓦燃气CPS的一部分，使用天然气运行的25兆瓦FСBPI的投资回收期约为2年。在FCBPI的安装容量内，CPS的可操作性大大提高。