Analysis and Application of Variable Conductance Heat Pipe Air Preheater

• Published in: Journal of thermal science Vol. 20; no. 3; pp. 248 - 253
• Main Authors: Shi, Chengming, Wang, Yang, Liao, Quan, Yang, Ying
• Format: Journal Article
• Language: English
• Published: Heidelberg SP Science Press 01.09.2011
• Subjects: Classical and Continuum Physics; Engineering Fluid Dynamics; Engineering Thermodynamics; Heat and Mass Transfer; Physics; Physics and Astronomy; 传热分析; 可变; 工业应用; 接口模型; 流体温度; 热管空气预热器; 电导; 转移矩阵; anti-corrosion; variable conductance; anti-ash deposition; air preheater; heat pipe
• ISSN: 1003-2169; 1993-033X
• DOI: 10.1007/s11630-011-0466-5

The heat transfer analysis of variable conductance heat pipe air preheater was carried out. The temperature trans-fer matrix was obtained for the air preheater that comprises several discrete heat transfer units with same or different heat transfer surface area in a parallel or counter flow mode. By using the temperature transfer matrix, the outlet fluid temperatures could be easily calculated for a given air preheater and inlet fluid temperatures. The active length of condenser in a variable conductance heat pipe is determined according to the flat interface model. With the same initial conditions, the comparisons between variable conductance heat-pipe air preheater and regular heat pipe air preheater has been analyzed and tested in terms of heat pipe wall temperature, heat transfer surface area and outlet fluid temperatures. Based on the real industrial applications, it has been confirmed that the variable conductance heat pipe air preheater has excellent performance of anti-corrosion and anti-ash-deposition especially at the variable working condition and the sulfur coal （5%-6% mass fraction of sulfur） condition.