MAN Diesel & Turbo conducts gas engine power plant study
A comparative study conducted by the Essen-Duisburg University in cooperation with MAN Diesel & Turbo has concluded: “gas engine power plants offer a number of advantages over classic gas combined-cycle power plants”, with regards both to energy efficiency and cost effectiveness.
The study compared the power data of a conventional gas combined-cycle power plant with two different configurations of an engine power plant. In engine power plant technology, multiple gas engines are arranged in combination, and can be individually switched on or off as required.
Apart from industrial CHP, the main area of application for CHP plants in the multi-digit megawatt range is the supply of district heating.
“Industrial CHP applications tend to be very specific in their requirements for heat supply”, explained Tobias Vogel, Research Assistant in the Department for Environmental Process and System Technology at the Essen-Duisburg University, who provided support for the study. “For this reason, we focussed on district heating applications, and specifically the district heating network of a small city, which represents a typical example for district heating production in Germany.”
A multitude of variables were compared, such as the heat yield, electricity production, fuel consumption, fuel utilisation and financial yield of the systems.
“All of the systems provided the necessary heat demand and met the legally required efficiency of more than 80%”, continued Vogel. “But in the end, it must be noted that the engine combined systems have proven themselves more favourable than gas combined-cycle power plants and were opportune in terms of their energy efficiency and cost-effectiveness. The economic optimum was shown to be achieved with a mix of engines in simple CHP mode and others with downstream coupled water- or steam-cycles.”
“The concept of engine combined power plants is not very well established in Germany yet”, explained Dr. Thomas Polklas, Development Engineer at MAN Diesel & Turbo. “But especially when considering the background of the constantly rising feed-in of renewable energies to the grid, this technology offers further advantages. As well as ensuring the supply of a municipal power network, engine combined power plants can be used for grid support in the residual load market due to their flexibility and modular construction. There is a substantial potential for additional revenues here.”
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