Signal and Image Denoising Using Wavelet Transform

Abstract

The ISACOAST-CC (Isobaric Adiabatic Compressed Air Energy Storage - Combined Cycle) concept has been developed from 2008 till 2012 at the Institute for Heat and Fuel Technology (IWBT) of the Technische Universität Braunschweig and the chair of Automatic Control and Systems Theory of the Ruhr-Universität Bochum. The research project was sponsored by E.ON within the framework of the E.ON International Research Initiative. In addition technical assistance was provided by E.ON concerning combined cycle power plants and concerning the existing compressed air energy storage plant in Huntorf as well as by KBB Underground Technologies GmbH concerning salt caverns used as compressed air storages. The ISACOAST-CC concept aims to minimize the negative aspects of state-of-the-art CAES- (Compressed Air Energy Storage) plants by an innovative combination of a conventional combined cycle plant, compressed air energy storage and heat storage. In the presentation the ISACOAST-CC plant will be described in detail during charging, discharging and usual combined cycle operation showing the different capabilities of such a plant. Special focus will also be given on the heat storage and two typical designs will be presented. In addition stationary design calculations and dynamic simulation results will be explained. The calculations show, that storage-efficiencies above 80 % can be achieved. This is attained by a nearly isobaric pressurized air storage (cavern) with a brine shuttle pond, intermediate storage of compression heat and the use of a combined cycle. A further advantage of such a design is the possibility to operate the plant as a conventional combined cycle without compressed air and heat storages by electrical or mechanical interconnection of compressor and gas turbine. Thus the storage plant is also a back-up plant and this flexibility results in a higher amount of operational hours and increases profitability. The feasibility study is completed by a profitability study showing, that such a plant with an optimized design could have been operated profitably in the last ten years using a special operation strategy. For this study the costs of the power plant were determined mainly by asking the manufacturers of the different components, only the costs of a few components had to be estimated. For the revenues the EEX electricity price from 2002 to 2011 was used.