Sci/Tech Iron Powder Passes First Industrial Test as Renewable, Carbon Dioxide-Free Fuel

tom_mai78101

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Simple question: What if we could curb this whole fossil fuel-fed climate change nightmare and burn something else as an energy source instead? As a bonus, what if that something else is one of the most common elements on Earth?

Simple answer: Let’s burn iron.

While setting fire to an iron ingot is probably more trouble than it’s worth, fine iron powder mixed with air is highly combustible. When you burn this mixture, you’re oxidizing the iron. Whereas a carbon fuel oxidizes into CO2, an iron fuel oxidizes into Fe2O3, which is just rust. The nice thing about rust is that it’s a solid which can be captured post-combustion. And that’s the only byproduct of the entire business—in goes the iron powder, and out comes energy in the form of heat and rust powder. Iron has an energy density of about 11.3 kWh/L, which is better than gasoline. Although its specific energy is a relatively poor 1.4 kWh/kg, meaning that for a given amount of energy, iron powder will take up a little bit less space than gasoline but it’ll be almost ten times heavier.

It might not be suitable for powering your car, in other words. It probably won’t heat your house either. But it could be ideal for industry, which is where it’s being tested right now.

Researchers from TU Eindhoven have been developing iron powder as a practical fuel for the past several years, and last month they installed an iron powder heating system at a brewery in the Netherlands, which is turning all that stored up energy into beer. Since electricity can’t efficiently produce the kind of heat required for many industrial applications (brewing included), iron powder is a viable zero-carbon option, with only rust left over.

So what happens to all that rust? This is where things get clever, because the iron isn’t just a fuel that’s consumed— it’s energy storage that can be recharged. And to recharge it, you take all that Fe2O3, strip out the oxygen, and turn it back into Fe, ready to be burned again. It’s not easy to do this, but much of the energy and work that it takes to pry those Os away from the Fes get returned to you when you burn the Fe the next time. The idea is that you can use the same iron over and over again, discharging it and recharging it just like you would a battery.


Read more here. (Spectrum IEEE)
 
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