Control of an energy integrated solid oxide fuel cell system

Georgis, Dimitrios; Jogwar, Sujit S.; Almansoori, Ali; Daoutidis, Pródromos

doi:10.1109/acc.2011.5991513

Cited by 7 publications

(9 citation statements)

References 15 publications

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“…Note that the nonadiabatic scenario also sounds promising for design of the future novel processes in which the thermal coupling of the external fuel reformer and stack could be a tactic to improve the system's thermal efficiency. 26,27 Temperature profiles of individual cells, inside a stack, are shown in Figure 2. Moreover, the maximum temperature differences (between the "hottest" and "coldest" cells) along the stacking direction are included in the same graph.…”

Section: Resultsmentioning

confidence: 99%

“…While the earlier is always common for the commercial cases, the latter has been widely encountered in experimental test rigs where heat exchange between stack and surrounding furnace occurs. Note that the nonadiabatic scenario also sounds promising for design of the future novel processes in which the thermal coupling of the external fuel reformer and stack could be a tactic to improve the system’s thermal efficiency. , …”

Section: Resultsmentioning

confidence: 99%

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Planar Solid Oxide Fuel Cell Modeling and Optimization Targeting the Stack’s Temperature Gradient Minimization

Amiri

Tang

Vijay

et al. 2016

Ind. Eng. Chem. Res.

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A solid oxide fuel cell (SOFC) system consists of a fuel cell stack with its auxiliary components. Modelling an entire SOFC system can be simplified by employing standard process flowsheeting software. However, no in-built SOFC module exists within any of the commercial flowsheet simulators. In Amiri et al. (Comput. Chem. Eng., 2015, 78:10-23), a rigorous SOFC module was developed to fill this gap. That work outlined a multi-scale approach to SOFC modelling and presented analyses at compartment, channel and cell scales. The current work extends the approach to stack and system scales. Two case studies were conducted on a simulated multilayer, planar SOFC stack with its balance of plant (BoP) components. Firstly, the effect of flow maldistribution in the stack manifold on the SOFC's internal variables was examined. Secondly, the interaction between the stack and the BoP was investigated through the effect of recycling depleted fuel. The results showed that anode gas recycling could be used for managing the gradients within the stack, while also improving fuel utilisation and water management.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Planar Solid Oxide Fuel Cell Modeling and Optimization Targeting the Stack’s Temperature Gradient Minimization

Amiri

Tang

Vijay

et al. 2016

Ind. Eng. Chem. Res.

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“…The voltage loss resulting in the lower actual voltage delivered by the fuel cell is less than the open circuit voltage due to activation, ohmic and concentration polarization as described in ref. [11].…”

Section: Ethanol Steam Reforming Integrated Solid Oxide Fuel Cellmentioning

confidence: 99%

Energy Analysis of Ethanol Steam Reforming Integrated Solid Oxide Fuel Cell for Electrical Power Generation

Srisiriwat¹

2015

AMM

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As Thailand is importantly an agricultural country driving the bio-ethanol production from agricultural feedstock via fermentation process and a solid oxide fuel cell (SOFC) has been known as an attractive energy conversion device due to its high efficiency and fuel flexibility, SOFC fueled by ethanol for electrical power generation has been performed. Hydrogen-rich gas from ethanol steam reforming is used as fuel carrier converting to generate electrical energy in SOFC. This paper presents an energy analysis of integrated steam reformer and SOFC system to determine the suitable ethanol concentration giving the optimum SOFC electrical efficiency. In this study, the ethanol concentrations between 20 and 56 %wt corresponding to water-to-ethanol ratios from 10 to 2 were varied at a fixed feed flow rate of 1 g/s of ethanol solution for hydrogen production. The SOFC power efficiency increased although the amount of hydrogen and SOFC electrical power decreased with decreasing the ethanol concentration. However, for the first law analysis, the heat load of each unit was calculated and it can be concluded that the overall system efficiency increased with increasing the ethanol concentration.

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“…In case of the energy integration of SOFC systems, various integration strategies for SOFC energy systems proposed by Zhang et al [4]. Georgis et al [5][6] carried out the design and operation of an energy integrated SOFC system with an external methane steam reformer and applied a linear multi-loop control strategy developed for the entire integrated system [5] and a nonlinear model based controller derived for the control of fuel cell [6]. Moreover, many researches [7][8][9][10] investigated the control strategies of the combination of SOFC and gas turbine system that main control objective is to maintain SOFC stack temperature, fuel flow rate and fuel utilization.…”

Section: Introductionmentioning

confidence: 99%

Temperature Control of Solid Oxide Fuel Cell System with Coefficient Diagram Method

Nyawat¹,

Srisiriwat²

2016

Proceedings of the 5th International Conference on Mechanical Engineering, Materials and Energy (5th ICMEME2016)

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In this work, we address a coefficient diagram method (CDM) for designing temperature control available to an energy integrated solid oxide fuel cell (SOFC) system that the high temperature of SOFC exhaust gas can be a heat source for all heat exchangers in SOFC system. The SOFC system represents the multi-loop control system in which the key controlled variables are the SOFC, steam reformer and heat exchanger temperatures. For temperature control design, an air flow rate entering SOFC and a valve position of SOFC hot stream splitter are identified as the manipulated variables to regulate the main controlled variables of a SOFC temperature and a steam reformer temperature, respectively. By using the CDM, the stability and robustness for regulating the SOFC system temperatures were analyzed to offer the suitable control parameters and the simulation results showed that the designed temperature control of SOFC system provides a good performance to control the controlled variables and reject the disturbance.

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Control of an energy integrated solid oxide fuel cell system

Cited by 7 publications

References 15 publications

Planar Solid Oxide Fuel Cell Modeling and Optimization Targeting the Stack’s Temperature Gradient Minimization

Planar Solid Oxide Fuel Cell Modeling and Optimization Targeting the Stack’s Temperature Gradient Minimization

Energy Analysis of Ethanol Steam Reforming Integrated Solid Oxide Fuel Cell for Electrical Power Generation

Temperature Control of Solid Oxide Fuel Cell System with Coefficient Diagram Method

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