Modelling for part-load operation of solid oxide fuel cell–gas turbine hybrid power plant

Chan, Siew Hwa; Ho, H.K.; Tian, Yu Dong

doi:10.1016/s0378-7753(02)00613-4

Cited by 107 publications

(44 citation statements)

References 7 publications

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“…This type of hybrid system has been proven to have electrical efficiency of up to 53% at 200 kW output [3], and is considered to have potential electrical efficiencies that are higher than 60% [4][5][6]. To further study and understand the SOFC-MGT hybrid system, both static [7][8][9] and dynamic [10][11][12][13] performance analyses have been conducted recently.…”

Section: Introductionmentioning

confidence: 99%

Power and temperature control of fluctuating biomass gas fueled solid oxide fuel cell and micro gas turbine hybrid system

Kaneko

Brouwer

Samuelsen

2006

Journal of Power Sources

104

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Power and temperature control of fluctuating biomass gas fueled solid oxide fuel cell and micro gas turbine hybrid system AbstractThis paper addresses how the power and temperature are controlled in a biomass gas fueled solid oxide fuel cell (SOFC) and micro gas turbine (MGT) hybrid system. A SOFC and MGT dynamic model are developed and used to simulate the hybrid system performance operating on biomass gas. The transient behavior of both the SOFC and MGT are discussed in detail.An unstable power output is observed when the system is fed biomass gas. This instability is due to the fluctuation of gas composition in the fuel. A specially designed fuel controller succeeded not only in allowing the hybrid system to follow a step change of power demand from 32 to 35 kW, but also stably maintained the system power output at 35 kW. In addition to power control, fuel cell temperature is controlled by introduction and use of a bypass valve around the recuperator. By releasing excess heat to the exhaust, the bypass valve provided the control means to avoid the self-exciting behavior of system temperature and stabilized the temperature of SOFC at 850• C.

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Section: Introductionmentioning

confidence: 99%

Power and temperature control of fluctuating biomass gas fueled solid oxide fuel cell and micro gas turbine hybrid system

Kaneko

Brouwer

Samuelsen

2006

Journal of Power Sources

104

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“…The theoretical open-circuit voltage (volts) of an SOFC can be determined by the Nernst equation given as follows [15][16][17][18]:…”

Section: Electrochemical Descriptionsmentioning

confidence: 99%

“…where R = 8.314 J· mol −1 · K −1 is the universal gas constant, ∆°( ) = ∆ℎ°− ∆° stands for the molar Gibbs free energy change at 0 = 1 atm which also depends on temperature [15][16][17]19], H 2 , O 2 and H 2 O are the partial pressures of reactants H2, O2, and H2O, respectively. The Nernst potential is the maximum reversible voltage of an SOFC at given conditions, however the voltage of an operating SOFC is generally lower than this.…”

Section: Electrochemical Descriptionsmentioning

confidence: 99%

Modelling of a Solid Oxide Fuel Cell CHP System Coupled with a Hot Water Storage Tank for a Single Household

et al. 2015

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Abstract:In this paper a solid oxide fuel cell (SOFC) system for cogeneration of heat and power integrated with a stratified heat storage tank is studied. The use of a storage tank with thermal stratification allows one to increase the annual operating hours of CHP: heat can be produced when the request is low (for instance during the night), taking advantage of thermal stratification to increases the heat recovery performance. A model of the SOFC system is presented to estimate the energy required to meet the average electric energy demand of the residence. Two fuels are considered, namely syngas produced by gasification and natural gas. The tank model considers the temperature gradients over the tank height. The results of the numerical simulation are used to size the SOFC system and storage heat tank to provide energy for a small household using two different fuels. In particular it was shown that in the case of syngas, due to larger system heat output, a larger tank volume was required in order to accumulate unused heat over the night. The detailed description of the tank model will be useful to energy system modelers when sizing hot water tanks. Problem formulation is reported also using a Matlab script.

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“…The theoretical open-circuit voltage of an SOFC can be determined by the Nernst equation given as follows [32][33][34][35]:…”

Section: Electrochemical Descriptionsmentioning

confidence: 99%

“…As current is drawn from the fuel cell, the voltage falls due to internal resistances and overpotential losses. These losses are common to all types of fuel cells and cannot be eliminated [31,32,34]. Therefore, three types of polarizations, i.e., activation, ohmic and concentration, are considered and calculated through Eqs.…”

Section: Electrochemical Descriptionsmentioning

confidence: 99%

Optimal design and operation of a syngas-fuelled SOFC micro-CHP system for residential applications in different climate zones in China

Yang

Zhao

Liso

et al. 2014

Energy and Buildings

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Early version, also known as pre-print Link to publication from Aalborg University Citation for published version (APA):Yang, W., Zhao, Y., Liso, V., & Brandon, N. (2014). Optimal design and operation of a syngas-fuelled SOFC micro CHP system for residential applications in different climate zones in China. Energy and Buildings, 80, 613-622. https://doi.org/10.1016/j.enbuild.2014.05.015 General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.? Users may download and print one copy of any publication from the public portal for the purpose of private study or research. ? You may not further distribute the material or use it for any profit-making activity or commercial gain ? You may freely distribute the URL identifying the publication in the public portal ? Take down policyIf you believe that this document breaches copyright please contact us at vbn@aub.aau.dk providing details, and we will remove access to the work immediately and investigate your claim. t r a c tFuel cell based micro-CHP systems are expected to be one of the most promising technologies for implementation in the residential sector. Since the design and operation of such CHP systems are greatly dependent upon the seasonal atmospheric conditions, it is important to evaluate their performance under difference climate conditions to ensure that it is well matched with the local heat-to-power ratio. The aim of this study is to investigate the optimal design and operation of a syngas-fuelled SOFC micro-CHP system for small households located in five different climate zones in China. The ability of the micro-CHP to cover the heat and electricity demand of a 70 m 2 single-family apartment with an average number of occupants of 3 is evaluated. A detailed model of the micro-CHP unit coupled with a hot water storage tank and an auxiliary boiler is developed. System design trade-offs are discussed to determine the optimal match between the energy demand of the household for different climates across China and the energy supply of the micro-CHP during the whole year. Moreover, criteria for sizing the system components of the micro-CHP are specifically addressed. The developed methodology can be applied to different types of residence with different load profiles.

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Modelling for part-load operation of solid oxide fuel cell–gas turbine hybrid power plant

Cited by 107 publications

References 7 publications

Power and temperature control of fluctuating biomass gas fueled solid oxide fuel cell and micro gas turbine hybrid system

Power and temperature control of fluctuating biomass gas fueled solid oxide fuel cell and micro gas turbine hybrid system

Modelling of a Solid Oxide Fuel Cell CHP System Coupled with a Hot Water Storage Tank for a Single Household

Optimal design and operation of a syngas-fuelled SOFC micro-CHP system for residential applications in different climate zones in China

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