Energy and EzergyAnalysis of Iron Ore Pellets Induration in the Coal-Fired Rotary Kiln
Although many models of iron ore pelletsinduration process have been developed on the basis of the first law of thermodynamics, the exergy analysis, well grounded on the first and second law of thermodynamics, of the process in the rotary kiln is rare. Therefore, exergy balance test was systematically carried out on a kiln used for iron ore pellets induration in China. And according to the test, energy and exergy analysis has been conducted to investigate the irreversibility of the process. The energy analysis shows that magnetite oxidation accounts for 15% in energy input, while pellets enthalpy increase, gases enthalpy increase, and surface heat losses 78%, 16% and 15% respectively in energy output. Further, the exergy analysis reveals that the proportion of magnetite oxidation in exergy input is 12%, while pellets physical exergy increase, gases exergy increase in exergy output 42%, 12% respectively, and the largest exergy destruction (35 percent) resulting from the combustion irreversibility. At last, the effects of oxygen content and carbon dioxide concentration on the exergy losses have been studied and the result shows that by control of parameter of oxygen content ranging 9.0-11.0% in the kiln, the exergy destruction reaches the minimum at carbon dioxide concentration ranging 1.0-9.0%. In a word, this study provides a better understanding of the energy and exergy flows of iron ore pellets induration in the kiln and helps to economize energy.
energy and ezergy analysis iron ore pellets induration kiln irreversibility
ZHANG Yu FENG Jun-xiao XIE Zhi-yin ZHANG Cai GUO Nai-tao JI Jiang-feng
Thermal Science and Energy Engineering Department, University of Science and Technology Beijing, Beijing 100083, China
国际会议
The 5th International Congress on the Science and Technology of Ironmaking(第五届国际炼铁科技大会 ICSTI09)
上海
英文
306-310
2009-10-20（万方平台首次上网日期，不代表论文的发表时间）