The Efficiencies of Internal Reforming Molten Carbonate Fuel Cell Fueled by Natural Gas and Synthetic Natural Gas From Coal

2016 ◽  
Vol 13 (1) ◽  
Author(s):  
Hai-Kyung Seo ◽  
Won-shik Park ◽  
Hee Chun Lim
Keyword(s):  
Fuel Cell ◽  
Natural Gas ◽  
Steam Turbine ◽  
Molten Carbonate Fuel Cell ◽  
Molten Carbonate ◽  
Lower Efficiency ◽  
Capture Process ◽  
Synthetic Natural Gas ◽  
Internal Reforming ◽  
Carbonate Fuel Cell

When synthetic natural gas (SNG) is produced from coal and used as a fuel in the internal reforming molten carbonate fuel cell (ir-MCFC), electric efficiency can be no greater than 31%. This is because there are several exothermic reactions in the processes of converting coal to SNG, so that a maximum 64% of coal's energy is converted into SNG energy. This results in a lower efficiency than when the ir-MCFC with the electric efficiency of 48% is fueled by natural gas (NG). To increase electric efficiency with SNG, it is necessary to recover the exothermic heat generated from the processes of converting coal to SNG as steam, which can then be used in a steam turbine. When steam produced in the gasification, water gas shift (WGS), and methanation processes is used in a steam turbine, the gross electric efficiency will become 41%. If the steam and auxiliary power for CO2 capture process is consumed more, the net efficiency will be 27%. Use of additional steam from the exhausted gas of fuel cell can increase the total net efficiency to 49%.

scholarly journals A novel hybrid liquefied natural gas process with absorption refrigeration integrated with molten carbonate fuel cell

2021 ◽  
Author(s):  
Mehdi Mehrpooya ◽  
Parimah Bahramian ◽  
Fathollah Pourfayaz ◽  
Hadi Katooli ◽  
Mostafa Delpisheh
Keyword(s):  
Energy Consumption ◽  
Fuel Cell ◽  
Natural Gas ◽  
Hybrid System ◽  
Liquefied Natural Gas ◽  
Molten Carbonate Fuel Cell ◽  
Cooling Load ◽  
Absorption Refrigeration ◽  
Molten Carbonate ◽  
Carbonate Fuel Cell

Abstract The production of liquefied natural gas (LNG) is a high energy-consuming process. The study of ways to reduce energy consumption and consequently to reduce operational costs is imperative. Toward this purpose, this study proposes a hybrid system adopting a mixed refrigerant for the liquefaction of natural gas that is precooled with an ammonia/water absorption refrigeration (AR) cycle utilizing the exhaust heat of a molten carbonate fuel cell, 700°C and 2.74 bar, coupled with a gas turbine and a bottoming Brayton super-critical carbon dioxide cycle. The inauguration of the ammonia/water AR cycle to the LNG process increases the cooling load of the cycle by 10%, providing a 28.3-MW cooling load duty while having a 0.45 coefficient of performance. Employing the hybrid system reduces energy consumption, attaining 85% overall thermal efficiency, 53% electrical efficiency and 35% fuel cell efficiency. The hybrid system produces 6300 kg.mol.h−1 of LNG and 146.55 MW of electrical power. Thereafter, exergy and sensitivity analyses are implemented and, accordingly, the fuel cell had an 83% share of the exergy destruction and the whole system obtained a 95% exergy efficiency.

Studies of the effects of the reformer in an internal-reforming molten carbonate fuel cell by mathematical modeling

2002 ◽  
Vol 104 (1) ◽  
pp. 140-147 ◽  
Author(s):  
Hong-Kyu Park ◽  
Ye-Ro Lee ◽  
Mi-Hyun Kim ◽  
Gui-Yung Chung ◽  
Suk-Woo Nam ◽  
...  
Keyword(s):  
Mathematical Modeling ◽  
Fuel Cell ◽  
Molten Carbonate Fuel Cell ◽  
Molten Carbonate ◽  
Internal Reforming ◽  
Carbonate Fuel Cell

Direct internal reforming molten carbonate fuel cell with core–shell catalyst

2012 ◽  
Vol 37 (3) ◽  
pp. 2588-2595 ◽  
Author(s):  
Pengjie Wang ◽  
Li Zhou ◽  
Guanglong Li ◽  
Huaxin Lin ◽  
Zhigang Shao ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Molten Carbonate Fuel Cell ◽  
Core Shell ◽  
Molten Carbonate ◽  
Internal Reforming ◽  
Carbonate Fuel Cell ◽  
Direct Internal Reforming
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