NDLI: Thermal Analysis and Exergy Analysis of Evaporation Process in Alumina Refinery

Content Provider	IEEE Xplore Digital Library
Author	Wu Yanpeng Peng Xiaoqi Zhang Jianzhi Song Yanpo Li Shimin
Copyright Year	2011
Abstract	To reduce the energy consumption of evaporation process in alumina refinery, thermal and exergy analysis were applied to the four-effect evaporators and three-stage flashes evaporation system. Result indicates that the thermal efficiency of the evaporation system is only 15.22%. The thermal efficiencies of all links are high except that of the evaporator of effect IV, which is only 6.91%. The heat losses in the evaporators of effect IV, III and I are large, which are mainly in the form of condensed water and exhausted vapor output. The exergy efficiency of the evaporation system is only 19.33%and those of the four-effect evaporators are relative low. The exergy destruction ratios of the evaporators of effect IV, III and I are 37.42%, 34.64% and 19.41%, respectively, which are the key links for the improvement of the exergy efficiency of the evaporation system. The total intrinsic exergy destruction is slightly larger than the total extrinsic one. Thus recovery and utilization of waste heat and of condensed water and exhausted vapor should be enhanced, the operating parameters in evaporators and the way of using preheaters should be optimized or improved.
Starting Page	1002
Ending Page	1006
File Size	180120
Page Count	5
File Format	PDF
ISBN	9781612842783
DOI	10.1109/CDCIEM.2011.540
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-02-19
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Thermodynamics Evaporation process Exergy analysis Water heating Materials Water conservation Thermal analysis Mathematical model Energy saving
Content Type	Text
Resource Type	Article

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