Connection usage for the hambacher hole

Connection usage for the Hambacher hole

Rheinische Braunkohlerevier. Image: Haloorange / CC BY-SA-3.0

After completion of the carburetition, the Tebauloch could be used as a storage for power generation

Still, Hambach is related to the remaining Hambacher forest in the field of view of most people. However, that could change when the Hambacher hole as a pumped storage power plant receives a second life. With this then wind and PV stream, for which there are no customers in the environment, are then stored. For the brown coal flow, for example, the three levels of the Sleepseand in the Sudschwarl forest, at which the lignite electric RWE has been involved with 50 percent in the past, for example.

For the hole created since the late 1970s by the degradation of lignite hole, one could save the cost of a renaturation if you could find a technical connection usage there. This was also able to convince the operator of the lignite building, which would convince as a Rheinbraun and currently under the name RWE Power AG’s subsidiary of the RWE Group, to decide for the considered use.

The concrete ball from Lake Constance

At the end of 2016, in Lake Constance, the energy storage with the help of a concrete ball in the context of the Federal Ministry of Economics of the 1.1.2013 to 30.6.2017 requested project Stensea tested. First, the water was pumped out of the cavity of the ball. As soon as electricity was used, electricity the water over a turbine into the cavity.

The turbine and the generator coupled with it then generates electricity. The electricity was delivered to the mainland over a cable. Researchers of the Fraunhofer Institute for Energy Economics and Energy System Technology (Fraunhofer IEE) in Kassel were able to demonstrate that the idea of the two retired professors Horst Schmidt-Bocking from Frankfurt and Gerhard Luther from Saarbrucken works in practice, even if the ball in Lake Constance with her Diameter of just three meters could only save the performance of a wind turbine within four hours. The efficiency of the plant is estimated at 90 percent, which is significantly more goods than the efficiency of Power2Gas systems, which can achieve a maximum of one third of them.

The ball from Lake Constance in coarse

In the Hambacher Hole, you now want to scale the plant from the Lake Constance and to create a 100 to 200 meter high concrete construction in the average 450 meter deep Hambacher hole on a flat of about four square kilometers. From static reasons, the construction should be divided into individual cells, which are connected to each other via an internal pipe system, over which the water can be pumped up both, as well as when needed back into the structure can be pumped back into the structure and drives over the turbine the generator then drives again generated electricity.

The machine installation corresponds to the principle of the current pumped storage power plants. The idea dates back to 2011. Thereafter, by the then Hochtief Solutions AG, together with the then Fraunhofer Iwes in the Today as a Fraunhofer IEE, a preliminary study for the basic feasibility of the concept at Gross water depths was carried out in the sea, together with the former Fraunhofer IWES. The concept for the Hambacher Hoch goes back to this preliminary study, where you have renounced the challenge by the salt water.

Which capacity could offer such a system, is so far only as a surprising calculation. If one goes from a base of four square kilometers and a high of 100 meters and a middle depth of the lake of 400 meters then in Hambacher hole, the stored potential energy is 300 million kilowatt hours (kWh). This could save more than 270 gigawatt hours (GWH) in electrical energy in one cycle. This is about the eight times what the currently available in Germany can offer pump storage.

Further conceivable scaling

If you can inspire yourself for coarse technologies, there are still completely different dimensions in the Hamabcher hole. Thus, the inventors have continued to expect and stated that the hole was deepened to 1000 meters and extended the sole of the concrete hollow body to eight square kilometers. Then you also expand the high of the hollow body to 300 meters a storage capacity of 4000 GWh. In these gross arrangements, however, the plant engineering must then be further developed because the pumping turbines used today were probably not grown.

The cost of the pumped storage plant is given with one up to two cents per kilowatt hour, with not clear whether this is the pure operating costs or if the investment costs were considered. Completely unclear is also where the water should come from. Mostly today is from about 30 to 40 years, which are needed until the Hambacher hole could be filled with water. Since the concrete hollow body had to be built before flooding, he must then wait for the time until the full flooding of the Hambacher hole unused.

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