Techno-Economic Analysis and Feasibility Study of a Solid Oxide Fuel Cell-Battery Hybrid System for Water Taxi Application

2019 ◽  
Vol 16 (2) ◽  
Author(s):  
Datong Song ◽  
Xinge Zhang ◽  
Roberto Neagu ◽  
Wei Qu
Keyword(s):  
Fuel Cell ◽  
Economic Analysis ◽  
Solid Oxide Fuel Cell ◽  
Feasibility Study ◽  
Hybrid System ◽  
Ghg Emissions ◽  
Operation Time ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Power Sources

A hybrid power system consisting of an intermediate temperature solid oxide fuel cell (SOFC) and a lithium-ion battery is conceptually designed for water taxi applications. The sizing method of such a hybrid system is developed based on the resistance, acceleration performance, cruising cycle, and the speeds of a water taxi under the conditions of daily operation time and charge neutrality over a 24 h period. A techno-economic analysis (TEA) is performed for the proposed hybrid system and compared with other two power sources, a typical internal combustion engine (ICE), and a battery-only system. A feasibility study based on the weight and the volume of the hybrid system is conducted. The potential reduction of greenhouse gases (GHG) emissions is calculated and compared with the GHG emissions from water taxies powered by an ICE and a battery-only, respectively.

Optimum Performance of a Regenerative Gas Turbine Power Plant Operating With/Without a Solid Oxide Fuel Cell

2011 ◽  
Vol 8 (5) ◽  
Author(s):  
Y. Haseli
Keyword(s):  
Fuel Cell ◽  
Pressure Drop ◽  
Solid Oxide Fuel Cell ◽  
Hybrid System ◽  
Thermal Efficiency ◽  
Pressure Ratio ◽  
Solid Oxide ◽  
Work Output ◽  
Oxide Fuel ◽  
Optimum Pressure

Optimum pressure ratios of a regenerative gas turbine (RGT) power plant with and without a solid oxide fuel cell are investigated. It is shown that assuming a constant specific heat ratio throughout the RGT plant, explicit expressions can be derived for the optimum pressure ratios leading to maximum thermal efficiency and maximum net work output. It would be analytically complicated to apply the same method for the hybrid system due to the dependence of electrochemical parameters such as cell voltage on thermodynamic parameters like pressure and temperature. So, the thermodynamic optimization of this system is numerically studied using models of RGT plant and solid oxide fuel cell. Irreversibilities in terms of component efficiencies and total pressure drop within each configuration are taken into account. The main results for the RGT plant include maximization of the work output at the expenses of 2–4% lower thermal efficiency and higher capital costs of turbo-compressor compared to a design based on maximum thermal efficiency. On the other hand, the hybrid system is studied for a turbine inlet temperature (TIT) of 1 250–1 450 K and 10–20% total pressure drop in the system. The maximum thermal efficiency is found to be at a pressure ratio of 3–4, which is consistent with past studies. A higher TIT leads to a higher pressure ratio; however, no significant effect of pressure drop on the optimum pressure ratio is observed. The maximum work output of the hybrid system may take place at a pressure ratio at which the compressor outlet temperature is equal to the turbine downstream temperature. The work output increases with increasing the pressure ratio up to a point after which it starts to vary slightly. The pressure ratio at this point is suggested to be the optimal because the work output is very close to its maximum and the thermal efficiency is as high as a littler less than 60%.

Design and Performance Study of a Solid Oxide Fuel Cell and Gas Turbine Hybrid System Applied in Combined Cooling, Heating, and Power System

2012 ◽  
Vol 138 (4) ◽  
pp. 205-214 ◽  
Author(s):  
Hsiao-Wei D. Chiang ◽  
Chih-Neng Hsu ◽  
Wu-Bin Huang ◽  
Chien-Hsiung Lee ◽  
Wei-Ping Huang ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Power System ◽  
Solid Oxide Fuel Cell ◽  
Gas Turbine ◽  
Hybrid System ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Performance Study ◽  
And Performance ◽  
Combined Cooling

Performance Comparison of Internal Reforming Against External Reforming in a Solid Oxide Fuel Cell, Gas Turbine Hybrid System

2005 ◽  
Vol 127 (1) ◽  
pp. 86-90 ◽  
Author(s):  
Eric A. Liese ◽  
Randall S. Gemmen
Keyword(s):  
Fuel Cells ◽  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Hybrid System ◽  
Waste Heat ◽  
Performance Comparison ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Internal Reforming ◽  
Hybrid Configuration

Solid Oxide Fuel Cell (SOFC) developers are presently considering both internal and external reforming fuel cell designs. Generally, the endothermic reforming reaction and excess air through the cathode provide the cooling needed to remove waste heat from the fuel cell. Current information suggests that external reforming fuel cells will require a flow rate twice the amount necessary for internal reforming fuel cells. The increased airflow could negatively impact system performance. This paper compares the performance among various external reforming hybrid configurations and an internal reforming hybrid configuration. A system configuration that uses the reformer to cool a cathode recycle stream is introduced, and a system that uses interstage external reforming is proposed. Results show that the thermodynamic performance of these proposed concepts are an improvement over a base-concept external approach, and can be better than an internal reforming hybrid system, depending on the fuel cell cooling requirements.

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