Das Projekt "Hot gas-cleaning" wird vom Umweltbundesamt gefördert und von DMT-Gesellschaft für Forschung und Prüfung mbH durchgeführt. General Information: Descriptions of the individual parts of the project are given below. Removal of trace elements in hot gas cleaning systems (CSIC). Study of the capture of trace elements by a range of different sorbents - mainly metal mixed oxides, clay materials and alkaline-earth carbonates but also some alumina and siliceous materials - in two laboratory scale reactors (a fixed bed and a fluidised bed) at temperatures between 550 and 750 degree C. Different compositions of the simulated coal gas stream will also be tested. Different sorbents, temperatures and stream gas composition will be studied during each of three periods of six months in each of the three years of the programme. Hot H2S Removal by using waste products as solvents (TGI). Testing of red mud (a residue from aluminium manufacture) and electric arc furnace dust (a residue from steel making) as sorbents for hot dry desulphurisation of coat derived fuel gas. These materials have been chosen as containing potential sorbents including calcium, iron, zinc and manganese oxides. Tests will be carried out in a laboratory-scale pressurised reactor. Use of carbon materials and membranes for hot gas clean up (DMT). Study of the potential use of carbon materials for removing trace metals and sulphur compounds from hot gasification gases (also potentially the separation of light gases such as hydrogen), taking advantage of the stability of carbon at high temperature and in corrosive atmospheres. A bed of carbon (or, where appropriate, another material) alone or in combination with a carbon filtering membrane installed in a laboratory gas circuit will be used: - to study the effect on composition of passing gas from a gasifier through a bed of activated carbon or a carbon molecular sieve at various temperatures, pressures and flow rates. - to repeat the studies as above with a filtering membrane made from carbon added. - to study the combination of sorption/filtration and catalytically active materials (i.e. using catalysts for the CO shift and for hydrogenation). The use of other compounds such as zeolitic membranes or granular beds will also be considered and the advantages of using combined gas clean up systems will be reviewed in the light of the data obtained. Development of improved stable catalysts and trace elements capture for hot gas cleaning in advanced power generation (CRE Group). Studies will be carried out on existing equipment to improve and assess catalysts based on iron oxide on silica and titania with mixed metal oxides to remove ammonia, hydrogen cyanide, hydrogen chloride, arsine, hydrogen sulphide and carbonyl sulphide. Selected catalysts will be tested at pressures up to 20 bar and temperatures in the range 500 - 800 degree C using simulated atmospheres. ... Prime Contractor: Deutsche Montan Technologie, Gesellschaft für Forschung und Prüfung mbH (DMT); Essen; Germany.
Das Projekt "Untersuchungen zum globalen Kreislauf von Carbonylsulfid (OCS) und zum Austausch von OCS zwischen terrestrischer Vegetation und Atmosphaere" wird vom Umweltbundesamt gefördert und von Universität Frankfurt, Institut für Meteorologie und Geophysik, Arbeitsgruppe Physik der Atmosphäre durchgeführt. Carbonylsulfid (OCS) ist die haeufigste Schwefelverbindung in der Troposphaere und das bedeutendste Quellgas des klimatologisch und luftchemisch relevanten stratosphaerischen Schwefelsaeureaerosols. Seine globale Bilanz weist durch ein drastisches Ungleichgewicht zwischen den bekannten Quell- und Senkenstaerken auf fundamentale Kenntnisluecken hin. Insbesondere die Aufnahme von OCS durch Landpflanzen und seine anthropogenen Quellen sind unzulaenglich bekannt. Feldmessungen des OCS-Austausches zwischen terrestrischer Vegetation und Atmosphaere und der raumzeitlichen Variabilitaet von OCS sollen eine Datenbasis zur besseren Ueberpruefung der Konsistenz von Quellen, Senken und Verteilung des OCS erarbeiten. Dazu sollen mikrometeorologische OCS-Flussmessungen ueber einen Fichtenwald durchgefuehrt werden. Die OCS-Meridionalverteilung ueber dem Atlantik zu verschiedenen Jahreszeiten und eine OCS-Zeitreihe aus 50 Grad N sollen auf ein vegetationsbedingtes saisonales und ein anthropogenes Signal untersucht werden.