A study on a polygeneration plant based on solar power and solid oxide cells

Ullvius, Nicolás Cobos; Rokni, Masoud

doi:10.1016/j.ijhydene.2018.04.085

Cited by 25 publications

(7 citation statements)

References 32 publications

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“…Ullvius and Rokni [41] suggest a rather different approach to extracting additional value from an rSOC plant: the use of waste heat for water desalination using direct contact membrane distillation. Such a system was modelled for deployment on the South African coast, with concentrated solar power providing both heat and power for electrolysis.…”

Section: Key Challengesmentioning

confidence: 99%

Suitability of energy storage with reversible solid oxide cells for microgrid applications

Hutty

Dong

Brown

2020

Energy Conversion and Management

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Reversible solid oxide cells (rSOCs) offer the prospect of long term bulk energy storage using hydrogen or methane fuel. Solid oxide technology, whilst less mature than alkaline and PEM technology, offers superior conversion efficiency -especially for electrolysis.Furthermore, the possibility of using the cells reversibly means that separate 'power-to-gas' and 'gas-to-power' components are not needed, potentially reducing costs. In this work, we consider the suitability of energy storage using rSOCs and/or battery storage for a microgrid consisting of houses equipped with solar PV generation. An agent-based simulation model is developed to assess the performance of such a microgrid. The model enables the microgrid's self-sufficiency to be quantified, and hence the possible cost savings through avoided imports of grid power. Sizing of microgrid components is optimised to determine the most cost-effective design capable of achieving given selfsufficiency ratio. Case studies are considered for England and Texas. Initially, designs are considered with hydrogen energy storage only; subsequently, hybrid energy storage is considered, with a community scale battery working alongside the rSOC. Results suggest that payback periods for pure rSOC systems tend to be unfavourable. However, if prices fall to levels foreseen in the literature, a system designed to achieve 50% grid-independence could pay back its investment costs within 20 years. Systems designed for Texas need relatively less storage, owing to the good year-round solar resource; as such, payback time in Texas is superior to the UK. Hybrid storage with battery + rSOC is found to be preferable to battery only systems when (i) high SSR is required and (ii) large over-capacity of PV generation is not possible.

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Section: Key Challengesmentioning

confidence: 99%

Suitability of energy storage with reversible solid oxide cells for microgrid applications

Hutty

Dong

Brown

2020

Energy Conversion and Management

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“…in a hybrid power plant with a bottoming steam turbine cycle [31]. A model of the SOFC system was defined and simulated using the Dynamic Network Analyser software (DNA), a tool developed at the Technical University of Denmark (DTU) [30] [31]. Figure 7 represents the layout of the SOFC system.…”

Section: 1sofcmentioning

confidence: 99%

“…In particular, the latter is necessary to generate high-temperature steam from water to be fed as reactant. Operation of the SOEC considered in this work is also obtained by simulation with the tool DNA from DTU [30], whose features are described in Section 3.1. Figure 8 represents the layout considered: HEX1 and HEX2 are two heat exchangers that cool hydrogen and oxygen, respectively, after they are produced within the SOEC, while preheating water to obtain steam at the required working condition.…”

Section: 2soecmentioning

confidence: 99%

“…Section 2 describes the current system configuration, the operating strategies, and the models used to reproduce the various components' behaviour. Section 3 details the proposed novel system structure, which comprises innovative devices whose representation exploits existing tools [30]. In Section 4, the behaviour of the new units is simulated, and results are discussed together with the comparison of options.…”

Section: Introductionmentioning

confidence: 99%

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Enhancement of energy generation efficiency in industrial facilities by SOFC – SOEC systems with additional hydrogen production

Vialetto

Noro

Colbertaldo

et al. 2019

International Journal of Hydrogen Energy

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Industry is one of the highest energy consumption sector: some facilities like steelworks, foundries, or paper mills are highly energy-intensive activities. Many countries have already implemented subsidies on energy efficiency in generation and utilisation, with the aim of decreasing overall consumption and energy intensity of gross domestic product. Meanwhile, researchers have increased interest into alternative energy systems to decrease pollution and use of fossil fuels. Hydrogen, in particular, is proposed as a clean alternative energy vector, as it can be used as energy storage mean or to replace fossil fuels, e.g. for transport. This work analyses the revamping of the energy generation system of a paper mill by means of reversible solid oxide cells (RSOCs). The aim is not only to increase efficiency on energy generation, but also to create a polygeneration system where hydrogen is produced. Application on a real industrial facility, based in Italy with a production capacity of 60000 t/y of paper, is analysed. First, the current energy system is studied. Then, a novel system based on RSOC is proposed. Each component of the systems (both existing and novel) is defined using operational data, technical datasheet, or models defined with thermodynamic tools. Then, the interaction between them is studied. Primary energy analysis on the novel system is performed, and saving with respect to the current configuration is evaluated. Even if the complexity of the system increases, results show that saving occurs between 2 and 6 %. Hydrogen generation is assessed, comparing the RSOC integrated system with proton exchange membrane (PEM) electrolysis, in terms of both primary energy and economics. Results exhibit significant primary energy and good economic performance on hydrogen production with the novel system proposed (hydrogen cost decreases from 10 €/kg to at least 8 €/kg).

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“…The total configuration produces electricity of 500 kW and 6500 L fresh water per day. In another work, Ullvius and Rokni found that a similar system presents 19.3% overall efficiency.…”

Section: Introductionmentioning

confidence: 99%

Parametric analysis and yearly performance of a trigeneration system driven by solar‐dish collectors

et al. 2019

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Summary Solar‐driven polygeneration systems are promising technologies for covering many energy demands with a renewable and sustainable way. The objective of the present work is the investigation of a trigeneration system, which is driven by solar‐dish collectors. The examined trigeneration system includes an organic Rankine cycle (ORC), which operates with toluene, and an absorption heat pump, which operates with LiBr/H2O. The absorption heat pump is fed with heat by the condenser of the ORC, which operates at medium temperature levels (120°C to 150°C). The absorption heat pump produces both useful heat at 55°C and cooling at 12°C. The ORC produces electricity, and it is fed by the solar dishes. The examined ORC is a regenerative cycle with superheating. The total analysis is performed with a developed model in Engineering Equation Solver (EES). The system is investigated parametrically for different ORC heat‐rejection temperatures, different superheating levels in the turbine inlet, and various solar‐beam irradiation levels. Furthermore, the system is investigated on a yearly basis for the climate conditions of Athens (Greece) and for Belgrade (Serbia). It is found that the yearly system energy and exergy efficiencies are 108.39% and 20.92%, respectively, for Athens, while 111.38% and 21.50%, respectively, for Belgrade. The values over 100% for the energy efficiency are explained by the existence of a heat pump in the examined configuration. For both locations, the payback period is found close to 10 years and the internal rate of return close to 10%. The final results indicate that the examined configuration is a highly efficient and viable system, which operates only with a renewable energy source.

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A study on a polygeneration plant based on solar power and solid oxide cells

Cited by 25 publications

References 32 publications

Suitability of energy storage with reversible solid oxide cells for microgrid applications

Suitability of energy storage with reversible solid oxide cells for microgrid applications

Enhancement of energy generation efficiency in industrial facilities by SOFC – SOEC systems with additional hydrogen production

Parametric analysis and yearly performance of a trigeneration system driven by solar‐dish collectors

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