Renewable energy is going to be the main energy source because of the limited petroleum reservoir on earth. But many renewable energy sources are highly fluctuant and difficult to forecast. Storing excess renewable energy is a challenge. In this work, hydrogen is produced by electrolyzing water with excess renewable energy. When reacting with hydrogen, carbon dioxide becomes a carbon source for chemical products that diminishes the negative effects of carbon dioxide on the environment. To minimize the system cost and simplify the technical complexity, optimal hydrogen temporary storage systems must be chosen. Different hydrogen storage systems are studied in this work, including liquid hydrogen tank, high pressure tank system, pipeline system and salt cavity system. These systems are analyzed and compared considering their storage capacity, system costs, advantages and disadvantages. To analyze capital and operational expenditure of the hydrogen storage systems, an analysis mechanism is developed.
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