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Saarbrücken, Germany

Benesch W.A.,STEAG Energy Services GmbH | Nahrath S.,STEAG New Energies GmbH
VGB PowerTech

Steag's activities in power generation last now for 75 years. These are based on fossil fuels but also -since now more than ten years- on renewables. STEAG believes in the energy mix which means coexistence of conventional and renewable energies. This is to ensure a high available, economical energy supply. Especially the latter is for an industrial country like Germany of high importance. Besides the use of renewables itself like biomass, biogas deep geothermal energy, solarthermal and wind energy, the improvement of dynamics and the reduction of minimum load of conventional plants is of high importance. Experience how to manage this ambitious energy mix will be subject of this paper. Biomass mono as well as co-combustion is discussed. Standalone as well as wind parks are under investigation and realization. Solar only and hybrid schemes are in the focus. The well structured, supplier independent approach going along with operating experience is of help for conventional and for renewable power generation technology. Source

Steag New Energies Gmbh | Date: 2012-04-25

The invention relates to a control system for matching the output of a steam turbine (

Kurth M.,Esslingen University of Applied Sciences | Lens H.,STEAG Energy Services GmbH | Marquard J.,STEAG Energy Services GmbH | Dengel A.,STEAG New Energies GmbH | And 2 more authors.
VGB PowerTech

As electrical energy can only be stored in small amounts, electrical power systems must maintain the balance between the production and the usage of electricity at all times. Apart from intelligent hierarchical structures, this requires producers that are based on storable primary energy sources, such as coal, gas or water. The use of renewable energy sources implicates a reduction of the storability of primary energy. The current development shows an increasing usage of fluctuating primary energy sources such as wind and solar power. To compensate for this, storage solutions must be found at other locations in the energy conversion chain. In this paper, different storage technologies are compared and evaluated from the point of view of a power plant operator. We discuss the influence of these technologies on the grid. We present opportunities and experience with pressuridsed air and batteries as technologies for large storages. Finally, we show how thermodynamical storages in existing, conventional thermal power plants can be used for the compensation of fluctuations in the energy generation. Source

In Germany, the energetic utilisation of biomass, in particular the combustion of residual and old (waste) wood, has been much more common than in most other European countries due to the German EEG (German Renewable Energy Act). A lot of experience has been gathered in Germany that can be utilised for the benefit of other countries when exploiting the energetic potentials of biomass. Thus, the technical concept of a 25 MW biomass-fired power plant in England was based on the operating experience STEAG had made with eight domestic waste-wood-fired power plants. On the one hand, the concept is taking into account the special requirements made by waste wood in terms of fuel receiving, storage, conveying and combustion by securing plant safety. The moving-grate stoker firing was identified as best suited combustion technology because it does not require high fuel homogeneity and preparation of waste wood. On the other hand, the concept is aiming at possibly high energy efficiency, similar to large-scale power plants, in order to make the plant less volatile against price increases expected at the wood market. Therefore, it has been the first time that a power plant of this load range was designed with reheating thus enabling an economic and reliable overall concept. Source

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