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Automation Technologies 3/2014

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Automation Technologies 3/2014

SensorS and Measurement

SensorS and Measurement back to current issue previous page 02 Flow rate and pressure measurements in the methanisation plant for the gases hydrogen, carbon dioxide and oxygen. These measurements serve precise dosage of the supplied gases to the reactor Synthetic gas with unlimited uses The production seems complex, but it works. A chemical reaction, hydrogen being connected to carbon dioxide (CO 2 ), produces synthetic methane. Excess wind power is used to operate three electrolysers a 2 MW. They use previously prepared water to produce the hydrogen needed, which can now be taken from the plant and be used as fuel to power cell vehicles. Since there is no infrastructure for hydrogen at this time, the plant in Werlte will process the hydrogen fur- ther. A biogas plant on the operating premises, run by regional energy supplier EWE, produces biogas. In a chemically-technical procedure (amine wash), CO 2 is separated from the raw biogas and the separated biomethane is fed in. CO 2 , usually harmful to the climate, thus becomes an important raw material. The hydrogen is processed into synthetic natural gas in the methanisation plant with the help of carbon dioxide. The methane content in the synthetically produced natural gas is roughly 94 % and can be fed into the natural gas grid without limitation. The effectiveness of the plant on an area of 5,000 m² is at about 54 %. Driving 22.5 million km with “e-gas” The German natural gas grid measures a total length of approx. 440,000 km and has many natural gas storage tanks. The capacity is about 200 TWh and will last for several months. It is also an outstanding energy storage. The annual amount of “e-gas” Audi is planning to produce will be sufficient to fuel up about 1,500 vehicles of the type A3 g-tron and comfortably drive them 15,000 km. The example in Werlte shows that the energy turnaround can work out well. Photographs: Teaser, 03 Audi AG, 01, 02 Etogas GmbH 03 Pressure monitoring at the carbon dioxide interface with pressure transmitter Cerabar S www.endress.com AUTOMATION TECHNOLOGIES 3/2014

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