Optimum Operating Conditions for Alkaline Water Electrolysis Coupled with Solar PV Energy System

Balabel, Ashraf; Zaky, Mohamed S.; Sakr, I.M.

doi:10.1007/s13369-014-1050-6

Cited by 28 publications

(12 citation statements)

References 14 publications

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“…Whereas the electrolyte gap is minimal in zero-gap designs, conventional setups maintain a defined distance between both electrodes. As the specific conductivity of the electrolyte gap is affected by gas bubbles, there is an optimal electrode distance for conventional designs [50]. If the electrode distance is too small, the gas bubbles accumulate in the gap and lower the conductivity.…”

Section: Cell Design and Cell Voltagementioning

confidence: 99%

Alkaline Water Electrolysis Powered by Renewable Energy: A Review

2020

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Alkaline water electrolysis is a key technology for large-scale hydrogen production powered by renewable energy. As conventional electrolyzers are designed for operation at fixed process conditions, the implementation of fluctuating and highly intermittent renewable energy is challenging. This contribution shows the recent state of system descriptions for alkaline water electrolysis and renewable energies, such as solar and wind power. Each component of a hydrogen energy system needs to be optimized to increase the operation time and system efficiency. Only in this way can hydrogen produced by electrolysis processes be competitive with the conventional path based on fossil energy sources. Conventional alkaline water electrolyzers show a limited part-load range due to an increased gas impurity at low power availability. As explosive mixtures of hydrogen and oxygen must be prevented, a safety shutdown is performed when reaching specific gas contamination. Furthermore, the cell voltage should be optimized to maintain a high efficiency. While photovoltaic panels can be directly coupled to alkaline water electrolyzers, wind turbines require suitable converters with additional losses. By combining alkaline water electrolysis with hydrogen storage tanks and fuel cells, power grid stabilization can be performed. As a consequence, the conventional spinning reserve can be reduced, which additionally lowers the carbon dioxide emissions.

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Section: Cell Design and Cell Voltagementioning

confidence: 99%

Alkaline Water Electrolysis Powered by Renewable Energy: A Review

2020

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“…The electrolyzer temperature has enormous impact on the electrode reaction speed, overpotential, selectivity, and electrochemical engineering indicators such as working voltage and current efficiencies. The corrosion of electrolyte, the stability of electrode material, and the membrane material are also related to temperature . The study of the electrothermal characteristics of electrolyzers is of great significance for their engineering design and practical applications.…”

Section: Mathematical Model and Basic Constraints Of Awe Characteristicsmentioning

confidence: 99%

“…The corrosion of electrolyte, the stability of electrode material, and the membrane material are also related to temperature. [28][29][30] The study of the electrothermal characteristics of electrolyzers is of great significance for their engineering design and practical applications. The temperature rise mathematical model and temperature constraint based on electro-thermal characteristics of electrolyzers are expressed in Equation (1).…”

Section: Mathematical Model Of Electrothermal Characteristics and Tmentioning

confidence: 99%

Structure design and control strategy of a new alkaline water electrolyzer based on heat exchange

Shen

Zhang

et al. 2019

Int J Energy Res

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Summary The overall energy conversion efficiency and the power regulation performance of the volatile renewable energy alkaline water electrolyzer (AWE) hydrogen production system need to be improved. Efficient use of heat in the electrolysis process and optimization of the control strategy are technically feasible. According to the concept of heat exchange utilization, this paper proposes a series parallel modular structure of AWE, which realizes heat exchange and utilization between modules. Based on the electrothermal characteristics of AWE and the power fluctuation characteristics of volatile energy, the function positioning and control strategy of the module are proposed. Theoretical analysis, together with a case study, has been conducted to show the overall efficiency and power regulation characteristics of the traditional AWE, the traditional combined AWE and the proposed new AWE under various working scenarios. Research study results show that the proposed new structure and control strategy can effectively improve the overall energy efficiency and static as well as dynamic power regulation characteristics of the electrolyzer, with the energy efficiency increased up to 16%. Although the static power range decreases slightly in some conditions, it always maintains the ability of wide range regulation. The findings can provide reference for the research and development of new AWE that improve the power response capability and the comprehensive utilization of energy under the premise of ensuring a certain power adjustment range.

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“…The hydrogen production in the electrolyzer is performed via the splitting of water into hydrogen and oxygen which is relatively high because the water molecules have a stable structure at ambient temperature. A potential voltage of 1.23V is applied to cells to initiate the electrochemical reactions at the anode and cathode electrodes in the same time [10][11][12][13][14][15][16][17][18].…”

Section: Pem Electrolyzermentioning

confidence: 99%

Techno Economic Assessment of Hybrid Renewable Energy Systems Based on Power to Hydrogen and Methane Gas Concepts

Boubenia¹,

Hafaifa²,

Kouzou³

et al. 2018

Preprint

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This paper deals with the techno-economic study of the hybrid renewable energy system based on energy storage aspect under the form of hydrogen and methane. Indeed, with the intermittency of the renewable energy sources such as photovoltaic and wind energy, several problems of produced energy injection to the power system network can be encountered due to the shortage or the excess of these sources. This situation appeals the use of systems that ensure the stability of network based on the storage of energy surplus into gas using electrolyzer systems, which will be used afterward to cover the eventual shortage. In the present paper, the study of performance of each pathway of methane and hydrogen storage has been performed by the treatment of multiple scenarios via different architecture case studies in an Algerian location. Whereas, the energy produced by the photovoltaic system, the wind energy and the gas micro turbine sources are considered similar in each case. The modeling and simulation of the studied system operation under optimization criteria has been performed in this work, where the main aim is to define the appropriate configuration taking into account the different with low costs of investment, maintenance operation and immediate reactivity with a big storage capacity.

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Optimum Operating Conditions for Alkaline Water Electrolysis Coupled with Solar PV Energy System

Cited by 28 publications

References 14 publications

Alkaline Water Electrolysis Powered by Renewable Energy: A Review

Alkaline Water Electrolysis Powered by Renewable Energy: A Review

Structure design and control strategy of a new alkaline water electrolyzer based on heat exchange

Techno Economic Assessment of Hybrid Renewable Energy Systems Based on Power to Hydrogen and Methane Gas Concepts

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