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Abstract The goal of the multinational ACT project ELEGANCY is to accelerate the decarbonisation of the European energy system by exploiting synergies between carbon capture and storage (CCS) and hydrogen (H 2). The introduction of CCS is delayed due to lack of business models, the widespread use of H 2 is hindered by the cost and availability of large quantities of clean hydrogen. The five participating countries Norway, England, Netherlands, Switzerland and Germany want to investigate and evaluate the combination of a hydrogen infrastructure with CCS in case studies and develop a planning tool. The Ruhr-University Bochum is working interdisciplinarily with five institutes within the framework of the Research Department Closed Carbon Cycle Economy (RD-CCCE). Thus, in addition to the technical part, social, macroeconomic and legal aspects are considered in the German case study. This interdisciplinary approach is presented in this paper, describing the practices of the different disciplines. [ABSTRACT FROM AUTHOR]

The DFG Collaborative Research Center SFB/TRR129 “Oxyflame” is devoted to developing a fundamental understanding of effects relevant for the combustion of solid fuels in oxyfuel atmospheres. 17 complementary research projects at RWTH Aachen, TU Darmstadt, and Ruhr-Universität Bochum both numerically and experimentally deal with various aspects on scales reaching from single particles to complete combustion chambers. As part of this framework, this project experimentally addresses the impact of sorption effects on the surface of chars and of the diffusion into pores. Since the adsorption of different components of oxyfuel atmospheres is selective and since the composition of a boundary layer on the surface of char particles is relevant for equilibria and dynamics of heterogeneous reactions during char burnout, selectivities of sorption and effective diffusion coefficients are considered important inputs for the advancement of particle-burnout models. This paper describes results of measurements of the sorption of main components of oxyfuel atmospheres (CO 2 and O 2 ) on char particles. Selectivities are derived from the experimental results. The extrapolation of selectivities to higher temperatures, which is essential for their application in burnout models, is discussed. [ABSTRACT FROM AUTHOR]

Abstract: Carbon capture and storage (CCS) technologies result in demands on thermodynamic-property models that were previously unknown in energy technologies. This article summarises recent developments allowing for an accurate description of thermodynamic properties of mixtures that are typical for oxyfuel processes and for compression and transport of separated CO2. It addresses homogeneous fluid state as well as phase equilibria of fluid and solid phases. However, phase equilibria with scrubbing agents, as they are common for post combustion processes, are out of the scope of this article. [Copyright &y& Elsevier]

Abstract: The CO2Mix project is established in order to fill important knowledge gaps regarding thermophysical properties of CO2-rich mixtures relevant for CCS conditioning and transport. Even small amounts of impurities can have a large effect on these properties and hence on the design of process equipment and flow assurance calculations. Hence, accurate models backed up by experimental data of high quality are required for efficient and safe design and operation of CCS infrastructure and equipment. In the CO2Mix project, SINTEF Energy Research, Norwegian University of Science and Technology (NTNU) and Ruhr-Universitat Bochum (RUB) will perform accurate measurements of phase equilibria, density, and speed of sound. In this paper, the need for measurement of thermo-physical properties will be discussed, and the experimental setups will be described. [Copyright &y& Elsevier]

Abstract: Based on different sources a gas turbine model including a cooling model has been set up using the simulation software EBSILON® Professional. A gas turbine (GT) in simple cycle and a natural gas combined cycle (NGCC) including a triple pressure HRSG have been investigated and used as reference cycles. The NGCC has been modified to a semi-closed oxyfuel combined cycle (SCOC) with CO2 capture. Results from the ENCAP project have been used to evaluate the simulation results of this work. As a novel configuration a supercharged SCOC process (S-SCOC) has been presented. Both design-point and part-load simulations have been performed. In design-point the NGCC achieves a net efficiency of 56.6 %. For the SCOC process the net efficiency is lowered by 8.3 %-points due to the capture of CO2. At part-load a sliding pressure (variable supercharge) has been introduced for the S-SCOC process. The sliding pressure for part-load leads to a constant volumetric flow rate through the GT over the whole load range. Therefore, the supercharged process yields a constant pressure ratio and a constant exhaust temperature at part load. Sliding pressure operation allows for a superior performance of the GT for the whole load range. The influence of a higher pressure of the exhaust gas stream on the heat transfer in the HRSG has been investigated. Fuel mass flow and flow conditions have been kept constant for the different processes. It has been found that the flow conditions for both processes (SCOC: constant density, volumetric flow rate changes; S-SCOC: vice versa) lead approximately to the same results for the Reynolds number on the flue gas side at part load. Although the conditions differ for the atmospheric SCOC process and the S-SCOC process with sliding pressure, the impact of part-load operation on the heat transfer is very similar. Since the efficiency of the supercharged GT hardly changes at part load, the net efficiency of the S-SCOC at part load remains very high. At 50% load the S-SCOC achieves an efficiency of 96 % of the design point efficiency compared to 91 % for the NGCC. [Copyright &y& Elsevier]