One minute, raise awareness of green hydrogen!

The earliest use of green hydrogen as an energy source dates back to a village in the late 19th century. In Askow, where he teaches, Danish scientist Paul La Coure uses electricity generated by wind turbines to electrolyze water in a basement of 10 cells under a wind turbine building. On windy days, up to 1,000 liters (1m³) of hydrogen are produced per hour.


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One hundred years later, in the face of "environmental crisis" and "energy transition", hydrogen production, storage, transportation and application technology has become the focus of the 21st century.


| 01 for making green hydrogen what resources are needed?


Electrolysis water hydrogen production, production of raw materials are mainly "green electricity" and "pure water".


Green electricity is clean electricity generated from renewable energy sources such as wind and light. It takes about 56 kilowatt hours to produce 1 kilogram of hydrogen.


Pure water, also known as "raw water", should meet the relevant domestic water quality requirements for hydrogen production, that is, GB/T 37562-2019 "Technical Conditions for pressure type Hydroelectrolysis hydrogen Production system" - conductivity ≤1mS/m(basic hydrolysis hydrogen production system).


According to the equation, it theoretically takes 9kg of water to make 1kg of hydrogen, but considering the consumption of pure water and other consumption, it actually takes 15 to 18kg of water to make 1kg of hydrogen.


In terms of equipment, mainly photovoltaic modules and hydrogen production equipment, as well as equipment installation sites.


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| 02  What are the main way hydrogen storage?


Hydrogen is the simplest and lightest element in the universe, and normally we store it in high-pressure gas tanks/underground Spaces, but it takes up a lot of space.


For example, high pressure gaseous hydrogen storage cylinders are commonly available in 35MPa and 70MPa specifications, corresponding to hydrogen density of 25g/L and 41g/L respectively, with small gas storage capacity.


Compressed into liquid hydrogen, the corresponding density of liquid hydrogen at room temperature and pressure is about 70kg/m³, but it is technically difficult, mainly used in the field of aerospace.


In addition, there are solid hydrogen storage and organic liquid hydrogen storage methods, which are difficult to achieve large-scale application at present.


Also promising is the way compounds store hydrogen, by combining it with other elements to make compounds that are easier to store and transport, such as synthetic ammonia.


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|  03 We can use green hydrogen to do ?


The calorific value of hydrogen is as high as 142MJ/kg, which is 3-4 times that of fossil fuels such as coal and gasoline. It can provide power and electricity through direct combustion of hydrogen internal combustion engines and hydrogen gas turbines. It can also achieve heat and power supply through electrochemical reaction of hydrogen fuel cells.


When hydrogen is used as power by fuel cells, the fuel cell system efficiency is 50%, the gasoline engine position is 28%, the diesel engine is 38%, and the lithium battery system efficiency is 90%. When 1kg hydrogen is used in fuel cell vehicles, it is equivalent to 6.9L gasoline, 45L diesel or 18.6K lithium battery.


Most importantly, green hydrogen burns only water and produces no carbon emissions.


Green hydrogen can be used to replace a part of gray hydrogen, blue hydrogen, and even the use of coal and gas, for steel, residential, cement, industrial, automotive, commercial, petrochemical, light truck and bus, shipping railway and other industries to reduce carbon emissions is of great significance.


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Demand for electricity is seasonal, and the grid will be more stressed in cold winters or hot summers than in spring and autumn.


If hydrogen and electricity are combined, on the one hand, they can calm the intermittent fluctuations of renewable power generation, and at the same time, they can serve as seasonal reserves of energy, forming a strong coupled energy network.


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At the same time, hydrogen has a wide range of applications, it can be traded flexibly, there is a view that hydrogen is the "new oil" of the energy world of the future.


Here, to quote Jules Verne's vision of hydrogen energy in his 1874 novel The Mysterious Island: "One day water may be electrolyzed into hydrogen and oxygen and used as fuel, and the hydrogen and oxygen of which water is made... It will become an unlimited source of energy for heating and lighting."


Hydrogen energy, driving the future.


Data sources in the article:


① China Machine Press [meaning] The Hydrogen Revolution by Marc Albera;


(2) In the innovation of Hydrogen energy Industry of the State Power Investment Group, China Electric Power Press, 100 Questions on Hydrogen Energy.



Article source: Xibetu Hydrogen energy official micro

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