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Study on solid oxide fuel cell/closed-Cycle MHD combined power generation system

固体氧化物燃料电池/闭循环MHD联合发电系统研究

基本信息

批准号：
12680501
负责人：
INUI Yoshitaka
金额：
$ 2.24万
依托单位：
Toyohashi University of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12680501/
关键词：
solid oxide fuel cell closed-cycle MHD combined system pure oxygen combustion carbon dioxide recovery energy valance high cycle efficiency 炭素ガス液化回収

项目摘要

We propose a new fossil-fuel-utilized high-performance combined power generation system with liquefaction recovery of carbon dioxide. In the system, pure oxygen is used as the oxidant gas and the solid oxide fuel cell (SOFC) is selected as the topping cycle. The exhaust fuel gas of the SOFC is afterburned with its oxidant gas of pure oxygen and the heat of the combustion gas is utilized in the bottoming cycle of the closed-cycle MHD/gas turbine cycle. Since the SOFC is operated under the high temperature condition of about 1300 K, its thermal efficiency is very high by itself up to about 55 % and, in addition, its exhaust fuel gas has high utility value in the combined cycle. This is the reason why the SOFC is adopted as the topping cycle. The maximum temperature of the afterburned exhaust fuel gas by pure oxygen reaches about 2300 K. This temperature exceeds the applicable limit of gas turbine, whereas coincides with the suitable inlet temperature of the closed-cycle MHD generator. This is the reason why the MHD/gas turbine cycle is selected as the bottoming cycle. To determine the actual make-up of the proposed system and to calculate the total thermal efficiency, detailed heat balance is examined under the condition that the cell voltage and fuel utilization rate of the SOFC are 0.77 V and 85 %, the enthalpy extraction ratio and adiabatic efficiency of the MHD generator 35 % and 80 %, the adiabatic efficiency of the noble gas turbine and compressor 88 %, respectively. It is made clear that the total thermal efficiency of the system reaches 63.24 % (HHV) or 70.18 % (LHV). This efficiency is very high as for the system with carbon dioxide recovery. The proposed system, therefore, has excellent performance and is worth carrying out further research and development.

我们提出了一种新的化石燃料利用和二氧化碳液化回收的高性能联合发电系统。该系统采用纯氧作为氧化气，采用固体氧化物燃料电池(SOFC)作为加顶循环。SOFC的废气与纯氧的氧化剂气体一起再燃烧，燃烧气体的热量被用于闭式循环的磁流体/燃气轮机循环的底部循环。由于SOFC工作在1300K左右的高温条件下，其本身的热效率很高，高达55%左右，而且其废气在联合循环中具有很高的实用价值。这就是为什么采用SOFC作为打顶循环的原因。纯氧再燃废气的最高温度约为2300K，超过了燃气轮机的适用极限，而与闭式循环磁流体发电机的合适入口温度相吻合。这就是为什么选择磁流体/燃气轮机循环作为筑底循环的原因。在电池电压和燃料利用率分别为0.77V和85%，磁流体发电机的热抽出率和绝热效率分别为35%和80%，惰性燃气轮机和压缩机的绝热效率分别为88%的条件下，进行了详细的热平衡计算，以确定系统的实际组成和总的热效率。结果表明，该系统的总热效率可达63.24%(HHV)或70.18%(LHV)。这种效率对于二氧化碳回收系统来说是非常高的。因此，该系统具有良好的性能，值得进一步研究和开发。