Energy Technologies: Heat Recovery
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
Thursday 2:00 PM
March 2, 2017
Location: San Diego Convention Ctr
Session Chair: Ziqi Sun, Queensland University of Technology
2:00 PM Cancelled
Integrated Utilization of Sewage Sludge and Coal Gangue in Clinker Manufacture: Zhenzhou Yang1; Zuotai Zhang1; 1Peking University
The present study proposed a method of integrated utilization of sewage sludge (SS) and coal gangue (CG) in eco-cement clinker manufacture with the aim of heat recovery and environment protection. The results demonstrated that the incremental amounts of SS and CG addition was favorable for the formation of tricalcium silicate (C3S) during the calcinations, but excess amount of SS addition could cause the impediment effect on C3S formation. During the calcinations, most of trace elements could be immobilized especially Zn and cannot be easily leached out. Meanwhile, it was estimated that the use of SS and CG as additives can save over 60% energy and a fair amount of natural raw materials. Given the encouraging results in the present study, the co-process of sewage sludge and coal gangue in the cement kiln can be expected with the optimum energy recovery and minimum pollution to the environment.
High Efficiency Thermoelectric Materials (skutterudites, half Heusler alloys and clathrates) and Their Mechanical Properties: Gerda Rogl1; Andriy Grytsiv1; Ernst Bauer2; Michael Zehetbauer3; Peter Rogl4; 1Christian Doppler Laboratory for Thermoelectricity, Univ. Vienna and Vienna Univ. of Technology; 2Institute of Solid State Physics, University of Technology; 3Faculty of Physics, University of Vienna; 4Institute of Materials Chemistry and Research, University of Vienna
Thermoelectric (TE) conversion of waste heat into electricity demands optimised thermal and electrical transport in the leg material over a wide temperature range. Skutterudites, half-Heusler alloys and clathrates are known as promising candidates for environmentally friendly and low-cost TE materials in the middle to high temperature range. In this paper we present our latest p- and n-type TE materials, with high ZT values and high thermal-electric conversion efficiencies. A prerequisite for commercial use is mechanical robustness to undergo repetitive thermo cycling, but also to resist cracking or failure from any possible vibration. For these reasons, hardness, elastic moduli and fracture toughness and their dependence on composition, density and temperature were measured and evaluated as well as the coefficient of thermal expansion, which is important concerning modules, built with p- and n-type materials. An overview of all our data in comparison with other TE materials will be given.