Predictive Application of Retrievable Waste Heat of the Cement Industrial Rotary Kiln on Solid Oxide Fuel Cells

• Main Authors: Kai-Yuan Yang, 楊凱元
• Other Authors: Chung-Hsing Wu
• Format: Others
• Language: en_US
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/32884650591244918172

碩士 === 國立臺灣大學 === 生物產業機電工程學研究所 === 93 === When meeting the shortage of fossil fuels and the coming era of hydrogen energy, fuel cell energy emerged to be a promising technology in energy utilization in the future. Developed to work at 800 to 1,000 degree Celsiusand and up to 15 atm (tested by Ontario Hydro Technology), solid oxide fuel cells (SOFCs) can generate the maximum power output among all types of fuel cells. However, when operating the SOFCs, great amount of fossil fuel is actually consumed in order to meet their high-temperature demand. High amount of secondary pollutants are expelled accordingly. A possible brand new idea is thus proposed in this paper—a state-of-the-art tubular SOFC (TSOFC) can be installed either in the three dimensional heat flow field inside the cement industrial rotary kiln incinerator (RKI, located in Kaohsiung, Taiwan) or within its refractory layer where high temperature environment sustains around the clock when operating for the cement production. In this paper, simulation of the heat flow field and species remained after combustion in this kiln incinerator is achieved with the help of modern computer aided engineering (CAE) tool. Suitable manipulating regions are to be found and predicted via the commercially available CFD code FLUENT. Parameter of excess air values are the primary variable, the detailed interior heat flow field and the heat transfer model in the kiln shell are the secondary variables for evaluating the installation of SOFCs into rotary kilns. Before going on this study, kinetic parameters are parametrically varied and finite volume method (FVM) is introduced to solve the heat flow field and the visualization of the three dimensional flame structure is performed. Meanwhile, simulation of temperature results is compared with on-site field experiments and the installation possibilities of the SOFC on the rotary kiln incinerator can be reasonably predicted and assured