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Item type:Publication, Access status: with files , Mobilisation of organic compounds from reservoir rocks through the injection of CO₂ - comparison of baseline characterization and laboratory experiments(Elsevier, 2010-09); ; ; ; In the framework of CO₂ storage activities, the aim of our investigations is mainly to evaluate the effects of supercritical CO₂ (scCO₂) on the quantitative and qualitative extraction of organic compounds from reservoir rocks. Within the scope of the CO₂ storage project CO₂SINK the major task was to identify key mechanisms occurring in the reservoir as a result of the injection of CO₂ into a saline aquifer. Here, it is of special interest what types and amounts of organic matter will be extracted and mobilized from the reservoir rocks in conjunction with the injection of scCO₂. Thus, our investigations may help to evaluate the efficiency and reliability of the long-term storage of CO₂ in such a geological system. Here, we present compound-specific results from laboratory scCO₂-extraction experiments on reservoir rock samples from the CO₂ storage site in Ketzin, Germany. Low molecular weight organic acids (LMWOA) as well as polar lipid fatty acids (PLFA) extracted by scCO2 were analysed using ion chromatography and gas chromatography-mass spectrometry, respectively. Through the exposure to scCO₂ mainly formate and acetate, but also other LMWOA were released from the rock samples in varying amounts. PLFA profiles of scCO₂ extracts were dominated by saturated and unsaturated fatty acids with 16 and 18 carbon atoms of bacterial origin. The results of scCO₂ extraction are compared with the characterization of the organic inventory of pristine rock samples and fluid samples from observation wells of the Ketzin site to obtain information on quantitative and qualitative significance of the solvent potential of scCO₂.Publicationtype: Conference PaperScopus© Citations 22 292 410 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: with files , Semi-empirical model for the direct simulation of power plant with integrated post-combustion CO₂ capture processes by wet chemical absorptionIn this work, a semi-empirical column model is developed to represent post-combustion CO2capture processes with chemical solvents in coal-fired steam power plants. The solvents are represented by empirical correlations on the basis of fundamental measurement data (CO2 solubility, heat capacity, density). The model of a CO2 capture process including the column model is coupled to detailed models of a hard-coal-fired steam power plant and of a CO2 compressor to evaluate and compare the impact of CO2 capture on the overall power plant process using six different solvents.Publicationtype: Conference PaperScopus© Citations 11 322 418 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: with files , Derivation of power loss factors to evaluate the impact of post-combustion CO₂ capture processes on steam power plant performanceWhen integrating a post-combustion CO2capture process and a CO2compressor into a steam power plant, the heat duty for the regeneration of the solvent (and the corresponding steam extraction) shows to be the largest contributor to the overall net efficiency penalty of the power plant. One parameter which varies from plant to plant and which significantly affects the impact of steam extraction from the steam turbine on the power plant efficiency is the pressure in the IP/LP crossover. In this work, the dependency of the energy penalty on the quantity and quality of the heat duty is analysed and quantified for three state-of-the-art hard coal fired power plant configurations with different pressure levels in the IP/LP crossover.Publicationtype: Journal ArticleScopus© Citations 17 275 442