Method for storing hydrogen in an hybrid form
a hydrogen storage tank and hybrid technology, applied in the field of hydrogen storage, can solve the problems of not meeting the specific requirements of hydrogen storage tanks using metal hydride, and the usual response time of about one hundred milliseconds
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example 2
Hybrid Tank for Storing Hydrogen in Liquid and Solid Forms
[0061] A hybrid tank 1 for storing hydrogen having a total volume of one liter has been devised from two concentric containers 3,5 (see FIG. 2). The inner container 3 had a volume of 0.8 liter whereas the outer container 5 had a volume of 0.2 liter. An insulating sleeve 7 was positioned between the inner and the outer containers 3,5 to keep the inner container 3 at low temperature.
[0062] In use, the inner container 3 of the tank 1 was filled up with liquid hydrogen. It contained about 0.0708 kg / l.times.0.8 liter =0.0566 kg of hydrogen. The outer container 5 was filled with a powder of a metal hydride of the type LaNi.sub.5H.sub.6 which occupied about 50% of the volume, that is about 0.1 liter. Therefore, the outer container 5 contained 6.59 kg / l .times.0.1 liter.times.1.4% =0.0092 kg of hydrogen. The total amount of hydrogen stored within the tank 1 was equal to 0.0658 kg (14% in the outer tank and 86% in the inner tank).
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example 3
Hybrid Tank for Storing Hydrogen in Gas-Solid Form for use in a System Having Transitory Periods
[0065] In the tank disclosed in example 1, use was made of LaNi.sub.5H.sub.6 as the hydride. This compound is known to have a low equilibrium plateau (viz. lower than 40 bar) at operating temperature. Use could also have been made of other hydride with a low equilibrium plateau, such as NaAlH.sub.4, LiAlH.sub.4 or MgH.sub.2.
[0066] According to the invention, it is however possible to use also a hydride having an equilibrium plateau that is much higher at the operating temperature (typically ranging between 0.degree. and 100.degree. C.) than the equilibrium plateau of the conventional hydrides (typically ranging between 1 to 10 bar). Such a high equilibrium plateau is 40 bar or higher . An example of such hydrides is TiCr.sub.1.8 which has an equilibrium plateau at room temperature much higher than 100 bars (see FIG. 6). There are also medium temperature hydrides with equilibrium plateau a...
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