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Is a fuel cell vehicle made of aluminum hydrogen feasible?

by:CTECHi     2021-09-22
1. Energy consumption analysis of hydrogen production by the reaction of aluminum and water. Aluminum reacts with water to generate hydrogen 2Al+6H2Ou003du003d2Al(OH)3+3H2. The molecular weight of aluminum is 27 and the molecular weight of water is 18. According to the above chemical equation, aluminum on the left The ratio of mass consumption to water is 1:2. Therefore, every kilogram of water consumed consumes 0.5 kilograms of pure aluminum and produces 0.0556 kilograms of hydrogen. According to the introduction of President Pang of Youth Automobile, about 1 kilogram of water per kilometer consumes half a kilogram of aluminum. Aluminum is obtained by the method of electrolytically molten alumina: 2AL2O3u003du003d4AL+3O2 Electrolytic aluminum is a high energy-consuming industry. The electricity consumption per kilogram of aluminum is about 15 kilowatt-hours, so half a kilogram is 7.5 kilowatt-hours. In other words, the energy consumption of this car is equivalent to 7.5 kWh per kilometer. The battery capacity of the Yutong E8 model electric bus is 133 kWh and the cruising range is 190 kilometers; the Kaiwo electric bus has a battery capacity of 233.85 kWh and a cruising range of 350 kilometers. This shows that electric buses consume less than 0.7 kilowatt-hours of electricity per kilometer, which is less than one-tenth of Pang's hydrogen production electric buses. Putting aside the technical issues, what is the energy of such a car that wastes energy? There is no need to analyze the economic benefits, and the cost of power consumption alone is unacceptable, let alone the expensive reaction control system and fuel cell system. 2. Energy balance analysis under ideal conditions. This car may have problems with immature technology. If a perfect car is built, is the energy consumption acceptable in theory? Let's analyze it: The above calculations calculated that every half kilogram of aluminum produces 0.0556 kilograms of hydrogen, and the heat value of hydrogen is 1.43*10^8J per kilogram, so the heat of hydrogen produced by half a kilogram of aluminum is 7.95*10^6J; 1 kWh The heating value of electricity is 3.60*10^6J, so the 7.5 kWh of electricity consumed by aluminum production has a heat of 2.7*10^7J, which is 3.4 times the energy of hydrogen produced. According to the above calculation, the energy conversion rate of the process of electrolytic aluminum and aluminum hydrogen is only 29%. Since the output of hydrogen fuel cells is still electricity, even considering the energy consumption of battery charging and storage, this technical route loses more than two-thirds of the energy compared with pure electric vehicles. Note: Where did the lost energy go? The heat of reaction has entered the water, so this car must have a good heat dissipation system. 3. If the energy utilization efficiency of this bus is not considered by the energy loss of the fuel cell, the energy conversion rate of this bus has reached 45.3% (3.4/7.5) of the ideal situation. Conclusion 1. Electrolytic aluminum, aluminum reacts with water The technical route of producing hydrogen and using hydrogen fuel cells as power is simply not feasible. 2. There is huge room for improvement in the water hydrogen production bus of Youth Motor, although it is not feasible at all.
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