Thermo-economic assessment of molten carbonate fuel cell hybrid system combined between individual sCO2 power cycle and district heating

Ryu, Juyeol; Areum, Ko; Park, Sungho; Park, Jong-Po

doi:10.1016/j.applthermaleng.2020.114911

Cited by 35 publications

(8 citation statements)

References 28 publications

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“…The results demonstrate that the difference in specifications of some simulated streams in HYSYS software with streams of Reference [37] are very little, but its performance coefficient is lower than the reference due to its use in different operating conditions. Figure 4 indicates the comparison of the hybrid system developed in this paper with similar cogeneration structures based on the MCFC 25,27,34,44,50–54 . The results demonstrate that the hybrid system developed has higher electrical and overall efficiencies than the investigated structures.…”

Section: Process Simulationmentioning

confidence: 93%

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An innovative integrated CCHP system with water scrubbing‐based biogas upgrading unit and molten carbonate fuel cell

Ghorbani

Ebrahimi

Skandarzadeh

2022

Energy Science & Engineering

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The main purpose of this study is to develop an integrated structure of simultaneous generation of electricity and refrigeration as the main product and hot water as a by-product. This proposed structure consists of a water scrubbing biogas upgrading process, molten carbonate fuel cell (MCFC) unit, gas/ steam power (GSP) cycle, and absorption refrigeration (AR) system. In this regard, 10.71 kg/s untreated biogas enters the integrated system and 158,351 kW net power is produced. Wasted heat of the structure is utilized to generate cooling of 253.9 kW at a temperature of 243.6 K by applying the AR system and the rest of the heat is used to generate 8.391 kg/s hot water as the system byproducts. The process integration between the different parts has led to an increase in the thermal efficiency of the whole system so that the electrical and overall efficiencies are 78.68% and 79.86%, respectively. The investigation of the exergy study demonstrates that the exergy destruction of the entire structure is 71,859 kW, of which the turbine/compressor/pump section with 24,700 kW (with a share of 34.37% of the total) and MCFC/reformer section with 22,285 kW (with a share of 31.01% of the total) have the most irreversibility. The exergy efficiency of the hybrid structure is 71.06%. Through a parametric study, the present integrated system in various conditions is assessed. One of the results of main outcomes is the increase of overall efficiency up to 83.39% due to the reduction of inlet biogas methane mole content up to 50%. Rising the methane in inlet biogas, although leading to more production of system products, reduces the efficiencies of various parts of the system, including the MCFC unit and GSP cycle, as well as integrated system total efficiency. K E Y W O R D Sabsorption refrigeration cycle, biogas upgrading cycle, combined power plant, exergy analysis, molten carbonate fuel cell

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Section: Process Simulationmentioning

confidence: 93%

“…Comparison of the hybrid system developed with similar cogeneration structures based on the MCFC 25,27,34,44,50–54 . MCFC, molten carbonate fuel cell…”

Section: Process Simulationmentioning

confidence: 99%

An innovative integrated CCHP system with water scrubbing‐based biogas upgrading unit and molten carbonate fuel cell

Ghorbani

Ebrahimi

Skandarzadeh

2022

Energy Science & Engineering

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“…Since the fuel oxidation occurs very rapidly at anode side of MCFC, small SA of anode than cathode is acceptable in this case, while for cathode, the general requirements include sufficient electrical conductivity, limited solubility in carbonated electrolyte sufficient porosity for diffusion of reacting species, as well as stability in oxidizing atmosphere. 258,259 Nickel-based electrodes are most commonly employed for electrolysis in MCFCs. 260 The complete reaction mechanism for NiO catalyst has been studied extensively in many research works 257,261 At cathode, after oxidation and lithiation of carbonate ions, catalyst starts dissolving after reaction with hydrogen and ultimately precipitates out at anode causing short circuit of the cell.…”

Section: Electrodesmentioning

confidence: 99%

“…Generally, the required materials for MCFC anode show good electrical conductivity and excellent structural stability with suitable catalytic properties for a fuel used in cell. Since the fuel oxidation occurs very rapidly at anode side of MCFC, small SA of anode than cathode is acceptable in this case, while for cathode, the general requirements include sufficient electrical conductivity, limited solubility in carbonated electrolyte sufficient porosity for diffusion of reacting species, as well as stability in oxidizing atmosphere 258,259 . Nickel‐based electrodes are most commonly employed for electrolysis in MCFCs 260 .…”

Section: High‐temperature Fuel Cellsmentioning

confidence: 99%

A perspective on development of fuel cell materials: Electrodes and electrolyte

Sajid

Pervaiz

Ali³

et al. 2022

Intl J of Energy Research

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Summary The declining reserves and environmental concerns related to the use of fossil fuels have made the global think tanks to pursue for the technologies considered to be renewable as well as sustainable. Fuel cell technology is emerging and a green way to produce electricity, provided sufficient amount of hydrogen (fuel) is available that directly convert chemical energy to electrical energy. Despite of being an efficient and eco‐friendly source of energy, commercialization of fuel cells is still difficult to attain. Techno‐economic challenges like high manufacturing and assembly costs, water management, system size, nondurability, and instability of the system need to be addressed. In order to resolve these issues, considerable research has been carried out for the development of novel and inexpensive materials for the fuel cells. In this article, we have reviewed the development of electrodes and electrolyte materials for different types of fuel cells. A detailed description of applications, challenges, and improvement of electrodes/electrolytes materials of different types of fuel cells (polymer electrolyte membrane fuel cells, direct methanol fuel cells and solid oxide fuel cells) have been reported in this review article. A brief review of the development of materials for electrode of molten carbonate fuel cells has also been presented in the review.

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“…The final results were selected by three well-known methods, namely, the fuzzy, LINMAP, and TOPSIS methods, from the Pareto fronts obtained by the genetic algorithm. Ryu et al [10] developed three hybrid electricity generation structures using the outlet gases from the MCFCs at different positions of the supercritical CO 2 power generation cycle. The output of the economic assessment revealed that the use of the supercritical carbon dioxide cycle in the MCFC ventilation unit is more affordable when the heating costs less than USD 28 per kilocalorie and the heat exchanger cost is less than USD 100 per kW.…”

Section: Introductionmentioning

confidence: 99%

Development of an Integrated Structure for the Tri-Generation of Power, Liquid Carbon Dioxide, and Medium Pressure Steam Using a Molten Carbonate Fuel Cell, a Dual Pressure Linde-Hampson Liquefaction Plant, and a Heat Recovery Steam Generator

Ghorbani

2021

Sustainability

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Due to the increase in energy consumption and energy prices, the reduction in fossil fuel resources, and increasing concerns about global warming and environmental issues, it is necessary to develop more efficient energy conversion systems with low environmental impacts. Utilizing fuel cells in the combined process is a method of refrigeration and electricity simultaneous production with a high efficiency and low pollution. In this study, a combined process for the tri-generation of electricity, medium pressure steam, and liquid carbon dioxide by utilizing a molten carbonate fuel cell, a dual pressure Linde-Hampson liquefaction plant and a heat recovery steam generator is developed. This combined process produces 65.53 MW of electricity, 27.8 kg/s of medium pressure steam, and 142.9 kg/s of liquid carbon dioxide. One of the methods of long-term energy storage involves the use of a carbon dioxide liquefaction system. Some of the generated electricity is used in industrial and residential areas and the rest is used for storage as liquid carbon dioxide. Liquid carbon dioxide can be used for peak shavings in buildings. The waste heat from the Linde-Hampson liquefaction plant is used to produce the fuel cell inlet steam. Moreover, the exhaust heat of the fuel cell and gas turbine would be used to produce the medium pressure steam. The total efficiency of this combined process and the coefficient of performance of the refrigeration plant are 82.21% and 1.866, respectively. The exergy analysis of this combined process reveals that the exergy efficiency and the total exergy destruction are 73.18% and 102.7 MW, respectively. The highest rate of exergy destruction in the hybrid process equipment belongs to the fuel cell (37.72%), the HX6 heat exchanger (8.036%), and the HX7 heat exchanger (6.578%). The results of the sensitivity analysis show that an increase in the exit pressure of the V1 valve by 13.33% would result in an increase in the refrigeration energy by 2.151% and a reduction in the refrigeration cycle performance by 9.654%. Moreover, by increasing the inlet fuel to the fuel cell, the thermal efficiency of the whole combined process rises by 18.09%, and the whole exergy efficiency declines by 12.95%.

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Thermo-economic assessment of molten carbonate fuel cell hybrid system combined between individual sCO2 power cycle and district heating

Cited by 35 publications

References 28 publications

An innovative integrated CCHP system with water scrubbing‐based biogas upgrading unit and molten carbonate fuel cell

An innovative integrated CCHP system with water scrubbing‐based biogas upgrading unit and molten carbonate fuel cell

A perspective on development of fuel cell materials: Electrodes and electrolyte

Development of an Integrated Structure for the Tri-Generation of Power, Liquid Carbon Dioxide, and Medium Pressure Steam Using a Molten Carbonate Fuel Cell, a Dual Pressure Linde-Hampson Liquefaction Plant, and a Heat Recovery Steam Generator

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