Audi gives carbon dioxide a chance

Audi gives carbon dioxide a chance

Ingolstadt, 18. May 2011 – the concept of perpetuum mobile is depleted because it is not a self-retaining energy system at the e-gas project. A little bit of the term swifts to the forefrain, when you read what the audi intends: you want by wind­generate energy hydrogen and use it in turn to produce in a reaction of the h2 with co2 methane (ch4). Methane is also the main ingredient of natural gas and thus for combustion­motors suitable. Formulated shortly: audi makes fuel of wind power and uses co2, from which you do not know wherever it.

Element

The production chain consists essentially of windridding for power generation, an electrolyzer for generating hydrogen and an e-gas system that uses the co2 from a waste biogas plant. The co2 could also come from any other source that can provide the co2 in a properly high concentration. For distress, even the ambient air escapes what, according to audi, however, would mean additional effort. Further components of the system are lines, tanks, electronics and the compressors for feeding the gas into the existing natural gas network.

(source: audi ag)

Power buffer

But why not use the hydrogen for fuel cells or internal combustion engines? The former are still expensive, and there is no resilient infrastructure for hydrogen. The natural gas network, on the other hand, is well expanded in germany to the gas stations, suitable cars already on the market. According to audi, it can even be used as a net buffer for volatile energy sources such as wind or solar power, because the energy stored in methane could be influenced by gas power plant in the power grid. Nevertheless, hydrogen is also an option for audi long-term – the production resources arise with the e-gas project in any case.

The efficiency of the e-gas process is about 54 percent in the pilot plant according to audi. When using all possibilities in the process chain, which assesses the emphasis, efficiencies of 80 to 85 percent should be possible. However, only the efficiency is meant in one direction, ie from the wind turbine to methane. As the backpath is to be evaluated from the gas to electricity, it does not come out. For comparison: pumping careers reach a total efficiency of 70 to 85 percent, future adiabatic compressed air storage, so the energy supplier eon advertises, could achieve similar values.

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