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Discrete Dynamics in Nature and Society
Volume 2016, Article ID 8352317, 9 pages
http://dx.doi.org/10.1155/2016/8352317
Research Article

The Coupling Effect Research of Ash Deposition and Condensation in Low Temperature Flue Gas

1School of Energy & Power Engineering, Shandong University, Jinan 250061, China
2Jinan Institute of Measurement and Testing, Jinan 250002, China
3College of Physics Science & Technology, Jinan University, Jinan 250022, China

Received 5 March 2016; Accepted 11 April 2016

Academic Editor: Jingchao Zhang

Copyright © 2016 Lei Ma et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Ash deposition is a key factor that deteriorates the heat transfer performance and leads to higher energy consumption of low pressure economizer working in low temperature flue gas. In order to study the ash deposition of heat exchange tubes in low temperature flue gas, two experiments are carried out with different types of heat exchange tubes in different flue gas environments. In this paper, Nusselt Number Nu and fouling factor are calculated to describe the heat transfer characteristics so as to study the ash deposition condition. The scanning electron microscope (SEM) is used for the analysis of ash samples obtained from the outer wall of heat exchange tubes. The dynamic process of ash deposition is studied under different temperatures of outer wall. The results showed that ash deposition of heat exchanger will achieve a stable state in constant flue gas environment. According to the condition of condensation of acid vapor and water vapor, the process of ash deposition can be distinguished as mere ash deposition, acid-ash coupling deposition, and acid-water-ash coupling deposition.