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| 1 | CFD-simulation of a circulating fluidized bed riser显示文摘In the current work,a model of the fluid mechanics in the riser of a circulating fluidized bed(CFB)has been implemented using computational fluid dynamics(CFD).The model developed shall be used in future as the basis of 3D-reactor model for the simulation of large scale CFB combustors.The two-fluid model(TFM)approach is used to represent the fluid mechanics involved in the flow.The computational implementation is accomplished by the commercial software FLUENT.Different closure formulations are tested on a simplified geometry.Two different turbulence formulations,namely the swirl modified RNG k–εmodel and the Realizable k–εmodel,are tested in combination with two different approaches to solid phase turbulence,namely the dispersion and per phase approach.One focus of the current work is put on the study of different drag correlations.Besides the drag correlations by Syamlal et al.[Syamlal,M.,Rogers, W.,&O’Brien,T.J.(1993).MFIX documentation theory guide.Technical Report DOE/METC-94/1004,U.S. Department of Energy(DOE).Morgantown Energy Technology Center:Morgantown,WV]and Gidaspow [Gidaspow,D.(1994).Multiphase flow and fluidization.New York:Academic Press]the EMMS model has been used to determine the momentum exchange between the two phases.The resulting formulation is then used to simulate a 1-m×0.3-m cold CFB setup and is validated by experimental results[Schlichthrle, P.(2000).Fluid dynamics and mixing of solids and gas in the bottom zone of circulating fluidized beds. Unpublished doctoral dissertation,Technische Universitaet Hamburg-Harburg,Shaker Verlag:Aachen]. | Ernst-Ulrich Hartge Lars Ratschow Reiner Wischnewski Joachim Werther | 2009 | Particuology2009，7，4： | 39 |
| 2 | Simulation-supported measurements in large circulating fluidized bed combustors显示文摘The concept of simulation-supported measurement is suggested for the elucidation of processes occurring in the combustion chambers of large-scale circulating fluidized bed combustors where the desired information cannot be obtained by direct measurements.The concept is illustrated with the example of secondary air injection where the way the air is released,the penetration depth and the evenness of air distribution over the cross-sectional area of the combustion chamber are of interest.The measured information consists of lateral profiles of oxygen concentrations measured with gas sampling probes at two ports which were located 5 and 9 m,respectively,above the level of secondary air injection.The simulation is carried out on the basis of a 3D semi-empirical fluid-mechanical model of the circulating fluidized bed which is combined with models of gas and solids mixing,fuel distribution,devolatilization and combustion of char and volatiles.The combination of the simulation with the measurements yields a clear picture of the mechanism of secondary air injection,its penetration into the combustion chamber and its effect on the local combustion processes.The results confirm the usefulness of the concept of simulation-supported measurement for this application. | Joachim Werther Ernst-Ulrich Hartge Lars Ratschow Reiner Wischnewski | 2009 | Particuology2009，7，4： | 5 |
| 3 | Reactive gas-solids flows in large volumes—3D modeling of industrial circulating fluidized bed combustors显示文摘A model is presented for the simulation of reactive gas-solids flows in large industrial reactors. Circulating fluidized bed (CFB) combustors with several thousands of cubic meters reaction volume are probably the largest reactors of this type. A semi-empirical modeling approach has been chosen to model the three-dimensional concentration distributions of gas and solids components and temperatures inside the combustion chamber of such boilers. Two industrial CFB boilers are investigated in detail: the 105 MWe Duisburg combustor in Germany and the 235 MWe Turów combustor in Poland. The semi-empirical model approach is described first. Then the model is used to show how the three-dimensional concentration and temperature fields are formed by the interaction of several local phenomena. Good agreement between simulation and measurements has been achieved. | Reiner Wischnewski Lars Ratschow Ernst-Ulrich Hartge Joachim Werther | 2010 | Particuology2010，8，1： | 5 |
| 4 | Development and application of a new sessile drop contact angle method to assess soil water repellency 显示文摘 | Bachmann J Ellies A Hartge K H | 2000 | J Hydrol2000，23，： | 1 |
| 5 | The endothelium and vascular inflammation in diabetes显示文摘 | Hartge MM Unger T Kintscher U | 2007 | Dish Vasc Dis Res2007，4，2： | 1 |
| 6 | Endothelial dysfunction and its role in diabetic vascular disease 显示文摘 | HARTGE MM KINTSCHER U UNGER T | 2006 | Endocrinol Metab Clin North Am2006，35，3： | 1 |
| 7 | Performance of common genetic variants in breast-cancer risk models 显示文摘 | Wacholder S Hartge P Prentice R | 2010 | N Engl J Med2010，362，11： | 1 |
| 8 | The risk of cancer associated with specific mutations of BRCA1 and BRCA2 among Ashkenazi Jews显示文摘 | Hartge P Wacholder S | 1997 | N Engl J Med1997，336，20： | 1 |
| 9 | Population- based study of riskQ of breast cancer in carriers of BRCA2 mutation 显示文摘 | Struewing JP Hartge P ET AL | 1998 | Lancet1998，352，9137： | 1 |
| 10 | Modellierung des Koksinvertars und der Kokspartikelgroessenverteilung in Feuerungen mit zirkulierender Wirbelschicht 显示文摘 | Luecke K Hartge E U und Werther J | 2001 | Chemie ingenieur Technik2001，12，73： | 1 |
| 11 | Combustion of agricultural residues显示文摘 | WERTHER J SAENGER M HARTGE E U OGADA T SIAGI Z | 2000 | Prog Energy Combust Sci2000，26，1： | 1 |
| 12 | The endotheliumand vascular inflammation in diabetes显示文摘 | Hartge MM Unger T and Kintscher U | 2007 | Diabetes Vas DisResy 2007(2)2007，4，： | 1 |
| 13 | Prenatal diagnosis and outcome of muhiple pregnancies with reversed arterial perfusion (TRAP-sequence) 显示文摘 | Hartge DR Weichert J | 2012 | Arch Gynecol Obstet2012，286，1： | 1 |
| 14 | Endothelial dysfunction and its role in diabetic vascular disease显示文摘 | Hartge MM Kintscher U Unger T | 2006 | Endocrinol Metab Clin North Am2006，35，3： | 1 |
| 15 | Epidemiological characteristic of squamous cell carcinoma and adenocarcinoma of the bladder显示文摘 | Kantor AF Hartge P Hoove RN | 1998 | Cancer Res1998，48，13： | 1 |
| 16 | Dynamic simulation of the particle size distribution in a circulating fluidized bed combustor显示文摘 | HARTGE Ernst-Ulrich KLETT Cornelis | | 0，，01： | 1 |
| 17 | Genes, hormones, and pathways to breast cancer显示文摘 | Hartge P | 2003 | N EnglJ Med2003，348，23： | 1 |
| 18 | Combustion of coffee husks显示文摘 | Saenger M Hartge E-U Werther J | 2001 | Renewable Energy2001，23，： | 1 |
| 19 | Parity, oral contraceptives, and the risk of ovarian cancer among carriers and noncarriers of a BRCA1 or BRCA2 mutation 显示文摘 | Modan B Hartge P Yechezkel G | 2001 | N Engl J Med2001，26，345： | 1 |
| 20 | Cigarette smoking and risk of non-Hodgkin lymphoma:a pooled analysis from the International Lymphoma Epidemiology Consortium (Inter Lymph)显示文摘 | Morton LM Hartge P Holford TR | | 0，，04： | 1 |
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