The heat of combustion of hydrogen is high, and the calories burned per kilogram of hydrogen are about 3 times that of gasoline, 3.9 times that of alcohol, and 4.5 times that of coke. The product of combustion is water, the cleanest energy in the world. Rich in resources, hydrogen can be made from water, and water is the most abundant resource on earth. Hydrogen production from water electrolysis is currently one of the most widely used and mature methods. The process of hydrogen production from water as raw material is the reverse process of the combustion of hydrogen and oxygen to produce water. Therefore, as long as certain forms of certain energy are provided, the water can be decomposed. The efficiency of supplying electricity to decompose water to obtain hydrogen is generally in the range of 75-85%. The process is simple, no pollution, but the power consumption is large, so its application is subject to certain restrictions.
There are three ways to store hydrogen: high pressure gaseous storage; cryogenic liquid hydrogen storage; metal hydride storage.
Although hydrogen has good transportability, whether it is gaseous hydrogen or liquid hydrogen, they all have special problems that cannot be ignored in the process of use. First, because hydrogen is particularly light, it is transported and used in comparison with Other fuels. The volume of energy per unit in the process is particularly large, even with liquid hydrogen. Secondly, hydrogen is particularly prone to leakage. Hydrogen-fueled vehicle driving tests have proved that even with a vacuum-tight hydrogen fuel tank, the leakage rate reaches 2% every 24 hours, and gasoline leaks only 1% in one month. Therefore, hydrogen storage is Containers and hydrogen pipelines, fittings, valves must take special sealing measures. Third, the temperature of liquid hydrogen is so low that severe frostbite occurs when there is a little drop on the skin. Therefore, various safety measures should be taken during transportation and use.
There are three ways to store hydrogen: high pressure gaseous storage; cryogenic liquid hydrogen storage; metal hydride storage.
Although hydrogen has good transportability, whether it is gaseous hydrogen or liquid hydrogen, they all have special problems that cannot be ignored in the process of use. First, because hydrogen is particularly light, it is transported and used in comparison with Other fuels. The volume of energy per unit in the process is particularly large, even with liquid hydrogen. Secondly, hydrogen is particularly prone to leakage. Hydrogen-fueled vehicle driving tests have proved that even with a vacuum-tight hydrogen fuel tank, the leakage rate reaches 2% every 24 hours, and gasoline leaks only 1% in one month. Therefore, hydrogen storage is Containers and hydrogen pipelines, fittings, valves must take special sealing measures. Third, the temperature of liquid hydrogen is so low that severe frostbite occurs when there is a little drop on the skin. Therefore, various safety measures should be taken during transportation and use.
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