Analysis and application of variable conductance heat pipe air preheater |
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Authors: | Chengming Shi Yang Wang Quan Liao Ying Yang |
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Affiliation: | Chengming Shi, Yang Wang, Quan Liao and Ying Yang College of Power Engineering, Chongqing University, Chongqing, 400044, China Chengming Shi:Associate Professor |
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Abstract: | The heat transfer analysis of variable conductance heat pipe air preheater was carried out. The temperature transfer 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. |
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Keywords: | variable conductance heat pipe air preheater anti-corrosion anti-ash deposition |
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