Circulating renewable energy source hydrolysis hydrogen production system and method based on aluminum energy storage

Abstract

The invention discloses a circulating renewable energy source hydrolysis hydrogen production system based on aluminum energy storage, which comprises a renewable energy source power generation device,a circulating aluminum energy storage hydrogen production device and a hydrogenation device. The renewable energy power generation device is used for supplying electric energy to the circulating aluminum energy storage hydrogen production device; the circulating aluminum energy storage hydrogen production device is used for electrolyzing aluminum oxide to obtain aluminum powder, carrying out hydrogen production reaction on the aluminum powder to obtain hydrogen and aluminum oxide, outputting the hydrogen to the hydrogenation device, and recycling the aluminum oxide for continuous electrolysis; the hydrogenation device is used for drying and compressing the hydrogen and storing the hydrogen for use; the invention also discloses a circulating renewable energy source hydrolysis hydrogen production method based on aluminum energy storage, wherein the efficiency of electrolytic aluminum is over 90%, the hydrogen production efficiency of aluminum water can reach 95%, and the total hydrogenproduction efficiency can reach 80%, so that the efficient utilization of energy is achieved.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of new energy and chemical hydrogen production, in particular to a hydrolysis hydrogen production system and method based on aluminum energy storage for circulating renewable energy. Background technique [0002] As countries around the world pay more and more attention to issues such as energy security, ecological environment, and climate change, accelerating the development of renewable energy has become the general consensus and concerted action of the international community to promote energy transformation and development and respond to global climate change; however, due to wind power, photovoltaics, etc. Renewable energy has the characteristics of randomness and intermittency, and its connection to the power grid will cause power quality problems such as voltage fluctuations and frequency fluctuations, and may even affect the safe and stable operation of the power grid. In...

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Problems solved by technology

[0006] Due to the extremely low density of hydrogen (under standard conditions, the density of hydrogen is 0.0899g / L) and its flammable and explosive characteristics, on-site production is the best way to refuel fuel cells. In terms of fuel cell vehicles on the route, it has brought a lot of inconvenience; in addition, the current low-cost, small-scale, and flexible distribution of hydrogen production methods have not yet been realized, and hydrogen used as vehicle fuel can only be stored and transported; hydrogen storage in hydrides and adsorption hydrogen storage Under the condition that the technology is still immature, hydrogen is currently mainly stored and transported to hydrogen refueling stations by means of physical hydrogen storage such as gas-hydrogen trailers, pipeline transportation, and liquid hydrogen tank trucks to supply hydrogen for fuel cell vehicles.

Among them, the investment cost of pipeline transportation is too high and can only be point-to-point, so it is difficult to become the mainstream; the key technologies such as the serious energy consumption of liquid hydrogen tankers and the insulation of containers have not yet been overcome; and gas-hydrogen trailers (such as torpedo vehicles, etc.) will be in the future. However, this method still has two major disadvantages: one is that this method transports high-pressure gaseous hydrogen, and the hydrogen volume per vehicle is limited to less than 300kg, while the entire vehicle (torpedo vehicle) weighs 27,000kg. It is basically equivalent to an empty car running, and the high energy consumption per unit load is not economical; the second is that the transportation cost and safety are strongly correlated with the transportation distance. After the transportation radius exceeds 200km, the cost will increase sharply, and the safety hazard will also be greater

The storage and transportation costs of gas-hydrogen trailers have accounted for 40% to 70% of the selling price of hydrogen. Therefore, the transportation of gas-hydrogen trailers is limited to small-scale and short-distance transportation scenarios

[0007] Although the hydrogen production technology by using the excess electric energy generated by renewable energy to electrolyze water is a good medicine that can solve the "three wastes" of renewable energy and solve the problem of high-purity hydrogen source for fuel cell vehicles, but the new technology disclosed in the prior art Alkaline water electrolysis cells and solid polymer electrolyte electrolysis cells are often used in energy electrolysis water hydrogen production systems. The latter is currently not suitable for large-scale water electrolysis hydrogen production due to the high cost of raw materials such as solid electrolytes and noble metal catalysts. Due to its electrochemical kinetics, the alkaline electrolysis method requires a certain temperature (80-90°C) and catalyst selection during the electrolysis process. The electrolysis efficiency is 53.6%-62%, and the total hydrogen production system efficiency is less than 40%.

More importantly, this type of technical route is limited to local hydrogen production in renewable energy power plants. On the one hand, the storage of a large amount of hydrogen requires a large number of hydrogen tanks, which not only consumes a lot of energy (requires high pressure to enter the hydrogen bottle), but also occupies a large amount of fixed energy. Asset investment (high-pressure hydrogen tanks are expensive) leads to rising costs and is extremely unsafe; on the other hand, the use of gas-hydrogen trailers for transportation increases its cost and danger

Therefore, this technology does not solve the problem of storage and transportation of hydrogen

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