A Thermoelectric Waste-Heat-Recovery System for Portland Cement Rotary Kilns

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• 作者：Qi Luo ; Peng Li ; Lanlan Cai ; Pingwang Zhou ; Di Tang…
• 关键词：Thermoelectric ; rotary kiln ; waste heat recovery ; energy saving ; mathematical model
• 刊名：Journal of Electronic Materials
• 出版年：2015
• 出版时间：June 2015
• 年：2015
• 卷：44
• 期：6
• 页码：1750-1762
• 全文大小：2,409 KB
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• 作者单位：Qi Luo (1)
  Peng Li (2)
  Lanlan Cai (2)
  Pingwang Zhou (2)
  Di Tang (2)
  Pengcheng Zhai (1)
  Qingjie Zhang (1)
  
  1. School of Sciences, Wuhan University of Technology, Wuhan, 430070, China
  2. School of Mechanical and Electronic Engineering, Wuhan University of Technology, Wuhan, 430070, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Optical and Electronic Materials
  Characterization and Evaluation Materials
  Electronics, Microelectronics and Instrumentation
  Solid State Physics and Spectroscopy
  
• 出版者：Springer Boston
• ISSN：1543-186X

文摘

Portland cement is produced by one of the most energy-intensive industrial processes. Energy consumption in the manufacture of Portland cement is approximately 110-20?kWh?ton?. The cement rotary kiln is the crucial equipment used for cement production. Approximately 10-5% of the energy consumed in production of the cement clinker is directly dissipated into the atmosphere through the external surface of the rotary kiln. Innovative technology for energy conservation is urgently needed by the cement industry. In this paper we propose a novel thermoelectric waste-heat-recovery system to reduce heat losses from cement rotary kilns. This system is configured as an array of thermoelectric generation units arranged longitudinally on a secondary shell coaxial with the rotary kiln. A mathematical model was developed for estimation of the performance of waste heat recovery. Discussions mainly focus on electricity generation and energy saving, taking a Φ4.8?×?72?m cement rotary kiln as an example. Results show that the Bi₂Te₃–PbTe hybrid thermoelectric waste-heat-recovery system can generate approximately 211?kW electrical power while saving 3283?kW energy. Compared with the kiln without the thermoelectric recovery system, the kiln with the system can recover more than 32.85% of the energy that used to be lost as waste heat through the kiln surface.