Energy Technologies: Novel Technologies
Sponsored by: TMS Extraction and Processing Division, TMS Light Metals Division, TMS: Energy Committee, TMS: Pyrometallurgy Committee
Program Organizers: Lei Zhang, University of Alaska Fairbanks ; Jaroslaw Drelich, Michigan Technological University; Neale Neelameggham, Ind LLC; Donna Guillen, Idaho National Laboratory; Nawshad Haque, CSIRO; Jingxi Zhu , Carnegie Mellon University; Ziqi Sun, Queensland University of Technology; Tao Wang, Nucor Steel; John Howarter, Purdue University; Fiseha Tesfaye, Åbo Akademi University
Wednesday 2:00 PM
March 1, 2017
Location: San Diego Convention Ctr
Session Chair: Neale Neelameggham, Ind LLC; Jingxi Zhu, Sun Yat-Sen University; Tao Wang, Nucor Steel
2:00 PM Invited
Modeling Anthropogenic Heat Flux in Climate Models: Ganesan Subramanian1; Neale Neelameggham2; 1Independent Consultant; 2Ind LLC
Anthropogenic Heat Flux (AHF) is heat generated from use of non-renewable energy by humans in residential, commercial and industrial activity and is not included in state of the art Global Circulation Models(GCM) used to predict global impacts of climate change and set related policy. AHF is deemed to be a much smaller relative forcing, solely based on the global mean values.. Several papers in the Climate modeling area have highlighted the “Heat Island Effect” in high AHF areas and have modeled the global impact using regional climate models (RCM) embedded in GCMs. Through the use of simple climate models, this paper demonstrates that significant pockets of AHF can impact climate locally in ways significant enough to impact global climate. Inclusion of recently available spatial AHF distribution, rather than a global mean value is a key determinant to accurate modeling either on a regional or global scale.
2:30 PM Invited
Development of a Fluidized-Bed Ash Agglomeration Modeling Methodology to Include Particle-Level Heterogeneities in Ash Chemistry and Granular Physics: Aditi Khadilkar1; Peter Rozelle2; Sarma Pisupati1; 1Penn State University; 2US Department of Energy
In fluidized bed gasification and combustion systems, agglomeration occurs by sticking of fuel ash particles that are wetted by slag-liquid. The non-uniform temperature, gaseous atmosphere and heterogeneity in ash chemical composition need to be accounted for in the prediction of the slag-liquid formation and composition. Penn State developed a modelling methodology in which thermodynamic equilibrium calculations are used to estimate the amount of slag-liquid in the system and computational fluid dynamics modeling is used in conjunction to obtain the initial granular physics inputs. The results of this study indicated that agglomerate growth in fluidized bed combustors (FBC) is initiated at the particle-level by low-melting components rich in iron- and calcium-based minerals. Study of particle-level heterogeneities in ash composition revealed that agglomeration can begin at lower temperatures than the FBC operating temperatures of 850 °C, which would be remain undetected by bulk analysis alone.
2:50 PM Invited
In-situ Microscopic Study of Morphology Changes in Natural Hematite and Cu-spinel Particles during Cyclic Redox Gas Exposures for Chemical Looping Applications: Anna Nakano1; Jinichiro Nakano1; James Bennett2; 1US Department of Energy National Energy Technology Laboratory/ AECOM; 2US Department of Energy National Energy Technology Laboratory
Efficiency of the chemical looping combustion technology is adversely influenced by degradation of oxygen carrier materials during oxidation-reduction process changes at elevated temperatures. In this work, natural hematite (Fe2O3) and alumina (Al2O3) supported Cu-spinel (CuFe2O4) oxygen carrier particles were isothermally exposed to redox gas cycles (air and 10 vol.% CO-90 vol.% Ar) at approximately 800 °C and studied using a high temperature confocal scanning laser microscope for real time alterations in surface morphology, roughness, and particle volume. 3D topological scans from each cyclic gas exposure indicated hematite particles exhibited noticeable volume expansion in reduction and shrinkage in oxidation, corresponding to respective phase transformations. Materials degradation during the redox gas cycles is discussed.